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fiv/fiv-io.c

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//
// fiv-io.c: image operations
//
// Copyright (c) 2021 - 2024, Přemysl Eric Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
#include "config.h"
#include <errno.h>
#include <math.h>
#include <setjmp.h>
#include <stdio.h>
#include <cairo.h>
#include <glib.h>
#include <jpeglib.h>
#include <turbojpeg.h>
#include <webp/decode.h>
#include <webp/demux.h>
#include <webp/encode.h>
#include <webp/mux.h>
#ifdef HAVE_JPEG_QS
#include <libjpegqs.h>
#endif // HAVE_JPEG_QS
// Colour management must be handled before RGB conversions.
#ifdef HAVE_LCMS2
#include <lcms2.h>
#endif // HAVE_LCMS2
#define TIFF_TABLES_CONSTANTS_ONLY
#include "tiff-tables.h"
#include "tiffer.h"
#ifdef HAVE_LIBRAW
#include <libraw.h>
#if LIBRAW_VERSION >= LIBRAW_MAKE_VERSION(0, 21, 0)
#define LIBRAW_OPIONS_NO_MEMERR_CALLBACK 0
#endif
#endif // HAVE_LIBRAW
#ifdef HAVE_RESVG
#include <resvg.h>
#endif // HAVE_RESVG
#ifdef HAVE_LIBRSVG
#include <librsvg/rsvg.h>
#endif // HAVE_LIBRSVG
#ifdef HAVE_XCURSOR
#include <X11/Xcursor/Xcursor.h>
#endif // HAVE_XCURSOR
#ifdef HAVE_LIBHEIF
#include <libheif/heif.h>
#endif // HAVE_LIBHEIF
#ifdef HAVE_LIBTIFF
#include <tiff.h>
#include <tiffio.h>
#endif // HAVE_LIBTIFF
#ifdef HAVE_GDKPIXBUF
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk/gdk.h>
#endif // HAVE_GDKPIXBUF
#define WUFFS_IMPLEMENTATION
#define WUFFS_CONFIG__MODULES
#define WUFFS_CONFIG__MODULE__ADLER32
#define WUFFS_CONFIG__MODULE__BASE
#define WUFFS_CONFIG__MODULE__BMP
#define WUFFS_CONFIG__MODULE__CRC32
#define WUFFS_CONFIG__MODULE__DEFLATE
#define WUFFS_CONFIG__MODULE__GIF
#define WUFFS_CONFIG__MODULE__LZW
#define WUFFS_CONFIG__MODULE__PNG
#define WUFFS_CONFIG__MODULE__TGA
#define WUFFS_CONFIG__MODULE__ZLIB
#include "submodules/wuffs-mirror-release-c/release/c/wuffs-v0.3.c"
#include "fiv-io.h"
#if CAIRO_VERSION >= 11702 && X11_ACTUALLY_SUPPORTS_RGBA128F_OR_WE_USE_OPENGL
#define FIV_CAIRO_RGBA128F
#endif
// A subset of shared-mime-info that produces an appropriate list of
// file extensions. Chiefly motivated by the suckiness of raw photo formats:
// someone else will maintain the list of file extensions for us.
const char *fiv_io_supported_media_types[] = {
"image/bmp",
"image/gif",
"image/png",
"image/x-tga",
"image/jpeg",
"image/webp",
#ifdef HAVE_LIBRAW
"image/x-dcraw",
#endif // HAVE_LIBRAW
#if defined HAVE_RESVG || defined HAVE_LIBRSVG
"image/svg+xml",
#endif // HAVE_RESVG || HAVE_LIBRSVG
#ifdef HAVE_XCURSOR
"image/x-xcursor",
#endif // HAVE_XCURSOR
#ifdef HAVE_LIBHEIF
"image/heic",
"image/heif",
"image/avif",
#endif // HAVE_LIBHEIF
#ifdef HAVE_LIBTIFF
"image/tiff",
#endif // HAVE_LIBTIFF
NULL
};
gchar **
fiv_io_all_supported_media_types(void)
{
GHashTable *unique =
g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
GPtrArray *types = g_ptr_array_new();
for (const char **p = fiv_io_supported_media_types; *p; p++)
if (g_hash_table_insert(unique, g_strdup(*p), NULL))
g_ptr_array_add(types, g_strdup(*p));
#ifdef HAVE_GDKPIXBUF
GSList *formats = gdk_pixbuf_get_formats();
for (GSList *iter = formats; iter; iter = iter->next) {
gchar **subtypes = gdk_pixbuf_format_get_mime_types(iter->data);
for (gchar **p = subtypes; *p; p++)
if (g_hash_table_insert(unique, *p, NULL))
g_ptr_array_add(types, g_strdup(*p));
g_free(subtypes);
}
g_slist_free(formats);
#endif // HAVE_GDKPIXBUF
g_hash_table_unref(unique);
g_ptr_array_add(types, NULL);
return (gchar **) g_ptr_array_free(types, FALSE);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define FIV_IO_ERROR fiv_io_error_quark()
G_DEFINE_QUARK(fiv-io-error-quark, fiv_io_error)
enum FivIoError {
FIV_IO_ERROR_OPEN
};
static void
set_error(GError **error, const char *message)
{
g_set_error_literal(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, message);
}
static void add_warning(const FivIoOpenContext *ctx, const char *format, ...)
G_GNUC_PRINTF(2, 3);
static void
add_warning(const FivIoOpenContext *ctx, const char *format, ...)
{
va_list ap;
va_start(ap, format);
if (ctx->warnings)
g_ptr_array_add(ctx->warnings, g_strdup_vprintf(format, ap));
else
g_logv(G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, format, ap);
va_end(ap);
}
// --- Images ------------------------------------------------------------------
FivIoImage *
fiv_io_image_new(cairo_format_t format, uint32_t width, uint32_t height)
{
// CAIRO_STRIDE_ALIGNMENT is 4 bytes, we only use multiples.
size_t unit = 0;
switch (format) {
case CAIRO_FORMAT_RGB24:
case CAIRO_FORMAT_RGB30:
case CAIRO_FORMAT_ARGB32:
unit = 4;
break;
#if CAIRO_VERSION >= 11702
case CAIRO_FORMAT_RGB96F:
unit = 12;
break;
case CAIRO_FORMAT_RGBA128F:
unit = 16;
break;
#endif
default:
return NULL;
}
uint8_t *data = g_try_malloc0(unit * width * height);
if (!data)
return NULL;
FivIoImage *image = g_rc_box_new0(FivIoImage);
image->data = data;
image->format = format;
image->width = width;
image->stride = width * unit;
image->height = height;
return image;
}
FivIoImage *
fiv_io_image_ref(FivIoImage *self)
{
return g_rc_box_acquire(self);
}
static void
fiv_io_image_finalize(FivIoImage *image)
{
g_free(image->data);
g_bytes_unref(image->exif);
g_bytes_unref(image->icc);
g_bytes_unref(image->xmp);
g_bytes_unref(image->thum);
if (image->text)
g_hash_table_unref(image->text);
if (image->render)
image->render->destroy(image->render);
if (image->page_next)
fiv_io_image_unref(image->page_next);
if (image->frame_next)
fiv_io_image_unref(image->frame_next);
}
void
fiv_io_image_unref(FivIoImage *self)
{
g_rc_box_release_full(self, (GDestroyNotify) fiv_io_image_finalize);
}
cairo_surface_t *
fiv_io_image_to_surface_noref(const FivIoImage *image)
{
return cairo_image_surface_create_for_data(
image->data, image->format, image->width, image->height, image->stride);
}
cairo_surface_t *
fiv_io_image_to_surface(FivIoImage *image)
{
// TODO(p): Remove this shortcut eventually. And the function.
if (!image)
return NULL;
static cairo_user_data_key_t key_image;
cairo_surface_t *surface = cairo_image_surface_create_for_data(
image->data, image->format, image->width, image->height, image->stride);
cairo_surface_set_user_data(surface, &key_image,
image, (cairo_destroy_func_t) fiv_io_image_unref);
return surface;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
try_append_page(
FivIoImage *image, FivIoImage **result, FivIoImage **result_tail)
{
if (!image)
return false;
if (*result) {
(*result_tail)->page_next = image;
image->page_previous = *result_tail;
*result_tail = image;
} else {
*result = *result_tail = image;
}
return true;
}
// --- Colour management -------------------------------------------------------
FivIoProfile
fiv_io_profile_new(const void *data, size_t len)
{
#ifdef HAVE_LCMS2
return cmsOpenProfileFromMem(data, len);
#else
(void) data;
(void) len;
return NULL;
#endif
}
FivIoProfile
fiv_io_profile_new_sRGB(void)
{
#ifdef HAVE_LCMS2
return cmsCreate_sRGBProfile();
#else
return NULL;
#endif
}
FivIoProfile
fiv_io_profile_new_parametric(
double gamma, double whitepoint[2], double primaries[6])
{
#ifdef HAVE_LCMS2
// TODO(p): Make sure to use the library in a thread-safe manner.
cmsContext context = NULL;
const cmsCIExyY cmsWP = {whitepoint[0], whitepoint[1], 1.0};
const cmsCIExyYTRIPLE cmsP = {
{primaries[0], primaries[1], 1.0},
{primaries[2], primaries[3], 1.0},
{primaries[4], primaries[5], 1.0},
};
cmsToneCurve *curve = cmsBuildGamma(context, gamma);
if (!curve)
return NULL;
cmsHPROFILE profile = cmsCreateRGBProfileTHR(
context, &cmsWP, &cmsP, (cmsToneCurve *[3]){curve, curve, curve});
cmsFreeToneCurve(curve);
return profile;
#else
(void) gamma;
(void) whitepoint;
(void) primaries;
return NULL;
#endif
}
FivIoProfile
fiv_io_profile_new_sRGB_gamma(double gamma)
{
return fiv_io_profile_new_parametric(gamma,
(double[2]){0.3127, 0.3290},
(double[6]){0.6400, 0.3300, 0.3000, 0.6000, 0.1500, 0.0600});
}
static FivIoProfile
fiv_io_profile_new_from_bytes(GBytes *bytes)
{
gsize len = 0;
gconstpointer p = g_bytes_get_data(bytes, &len);
return fiv_io_profile_new(p, len);
}
static GBytes *
fiv_io_profile_to_bytes(FivIoProfile profile)
{
#ifdef HAVE_LCMS2
cmsUInt32Number len = 0;
(void) cmsSaveProfileToMem(profile, NULL, &len);
gchar *data = g_malloc0(len);
if (!cmsSaveProfileToMem(profile, data, &len)) {
g_free(data);
return NULL;
}
return g_bytes_new_take(data, len);
#else
(void) profile;
return NULL;
#endif
}
void
fiv_io_profile_free(FivIoProfile self)
{
#ifdef HAVE_LCMS2
cmsCloseProfile(self);
#else
(void) self;
#endif
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// TODO(p): In general, try to use CAIRO_FORMAT_RGB30 or CAIRO_FORMAT_RGBA128F.
#ifndef HAVE_LCMS2
#define FIV_IO_PROFILE_ARGB32 0
#define FIV_IO_PROFILE_4X16LE 0
#else
#define FIV_IO_PROFILE_ARGB32 \
(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_8 : TYPE_ARGB_8)
#define FIV_IO_PROFILE_4X16LE \
(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_16 : TYPE_BGRA_16_SE)
#endif
// CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be no padding with
// ARGB/BGRA/XRGB/BGRX.
static void
trivial_cmyk_to_host_byte_order_argb(unsigned char *p, int len)
{
// This CMYK handling has been seen in gdk-pixbuf/JPEG, GIMP/JPEG, skcms.
// It will typically produce horribly oversaturated results.
// Assume that all YCCK/CMYK JPEG files use inverted CMYK, as Photoshop
// does, see https://bugzilla.gnome.org/show_bug.cgi?id=618096
while (len--) {
int c = p[0], m = p[1], y = p[2], k = p[3];
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
p[0] = k * y / 255;
p[1] = k * m / 255;
p[2] = k * c / 255;
p[3] = 255;
#else
p[3] = k * y / 255;
p[2] = k * m / 255;
p[1] = k * c / 255;
p[0] = 255;
#endif
p += 4;
}
}
static void
fiv_io_profile_cmyk(
FivIoImage *image, FivIoProfile source, FivIoProfile target)
{
#ifndef HAVE_LCMS2
(void) source;
(void) target;
#else
cmsHTRANSFORM transform = NULL;
if (source && target) {
transform = cmsCreateTransform(source, TYPE_CMYK_8_REV, target,
FIV_IO_PROFILE_ARGB32, INTENT_PERCEPTUAL, 0);
}
if (transform) {
cmsDoTransform(
transform, image->data, image->data, image->width * image->height);
cmsDeleteTransform(transform);
return;
}
#endif
trivial_cmyk_to_host_byte_order_argb(
image->data, image->width * image->height);
}
static bool
fiv_io_profile_rgb_direct(unsigned char *data, int w, int h,
FivIoProfile source, FivIoProfile target,
uint32_t source_format, uint32_t target_format)
{
#ifndef HAVE_LCMS2
(void) data;
(void) w;
(void) h;
(void) source;
(void) source_format;
(void) target;
(void) target_format;
return false;
#else
// TODO(p): We should make this optional.
cmsHPROFILE src_fallback = NULL;
if (target && !source)
source = src_fallback = cmsCreate_sRGBProfile();
cmsHTRANSFORM transform = NULL;
if (source && target) {
transform = cmsCreateTransform(
source, source_format, target, target_format, INTENT_PERCEPTUAL, 0);
}
if (transform) {
cmsDoTransform(transform, data, data, w * h);
cmsDeleteTransform(transform);
}
if (src_fallback)
cmsCloseProfile(src_fallback);
return transform != NULL;
#endif
}
static void
fiv_io_profile_xrgb32(
FivIoImage *image, FivIoProfile source, FivIoProfile target)
{
fiv_io_profile_rgb_direct(image->data, image->width, image->height,
source, target, FIV_IO_PROFILE_ARGB32, FIV_IO_PROFILE_ARGB32);
}
static void
fiv_io_profile_4x16le_direct(
unsigned char *data, int w, int h, FivIoProfile source, FivIoProfile target)
{
fiv_io_profile_rgb_direct(data, w, h, source, target,
FIV_IO_PROFILE_4X16LE, FIV_IO_PROFILE_4X16LE);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
fiv_io_profile_page(FivIoImage *page, FivIoProfile target,
void (*frame_cb) (FivIoImage *, FivIoProfile, FivIoProfile))
{
FivIoProfile source = NULL;
if (page->icc)
source = fiv_io_profile_new_from_bytes(page->icc);
// TODO(p): All animations need to be composited in a linear colour space.
for (FivIoImage *frame = page; frame != NULL; frame = frame->frame_next)
frame_cb(frame, source, target);
if (source)
fiv_io_profile_free(source);
}
static void
fiv_io_premultiply_argb32(FivIoImage *image)
{
if (image->format != CAIRO_FORMAT_ARGB32)
return;
for (uint32_t y = 0; y < image->height; y++) {
uint32_t *dstp = (uint32_t *) (image->data + image->stride * y);
for (uint32_t x = 0; x < image->width; x++) {
uint32_t argb = dstp[x], a = argb >> 24;
dstp[x] = a << 24 |
PREMULTIPLY8(a, 0xFF & (argb >> 16)) << 16 |
PREMULTIPLY8(a, 0xFF & (argb >> 8)) << 8 |
PREMULTIPLY8(a, 0xFF & argb);
}
}
}
#if defined HAVE_LCMS2 && LCMS_VERSION >= 2130
#define FIV_IO_PROFILE_ARGB32_PREMUL \
(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TYPE_BGRA_8_PREMUL : TYPE_ARGB_8_PREMUL)
static void
fiv_io_profile_argb32(FivIoImage *image,
FivIoProfile source, FivIoProfile target)
{
g_return_if_fail(image->format == CAIRO_FORMAT_ARGB32);
fiv_io_profile_rgb_direct(image->data, image->width, image->height,
source, target,
FIV_IO_PROFILE_ARGB32_PREMUL, FIV_IO_PROFILE_ARGB32_PREMUL);
}
static void
fiv_io_profile_argb32_premultiply(
FivIoImage *image, FivIoProfile source, FivIoProfile target)
{
if (image->format != CAIRO_FORMAT_ARGB32) {
fiv_io_profile_xrgb32(image, source, target);
} else if (!fiv_io_profile_rgb_direct(image->data,
image->width, image->height, source, target,
FIV_IO_PROFILE_ARGB32, FIV_IO_PROFILE_ARGB32_PREMUL)) {
g_debug("failed to create a premultiplying transform");
fiv_io_premultiply_argb32(image);
}
}
#else // ! HAVE_LCMS2 || LCMS_VERSION < 2130
// TODO(p): Unpremultiply, transform, repremultiply. Or require lcms2>=2.13.
#define fiv_io_profile_argb32(surface, source, target)
static void
fiv_io_profile_argb32_premultiply(
FivIoImage *image, FivIoProfile source, FivIoProfile target)
{
fiv_io_profile_xrgb32(image, source, target);
fiv_io_premultiply_argb32(image);
}
#endif // ! HAVE_LCMS2 || LCMS_VERSION < 2130
#define fiv_io_profile_argb32_premultiply_page(page, target) \
fiv_io_profile_page((page), (target), fiv_io_profile_argb32_premultiply)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
fiv_io_profile_any(FivIoImage *image, FivIoProfile source, FivIoProfile target)
{
// TODO(p): Ensure we do colour management early enough, so that
// no avoidable increase of quantization error occurs beforehands,
// and also for correct alpha compositing.
switch (image->format) {
break; case CAIRO_FORMAT_RGB24:
fiv_io_profile_xrgb32(image, source, target);
break; case CAIRO_FORMAT_ARGB32:
fiv_io_profile_argb32(image, source, target);
break; default:
g_debug("CM attempted on an unsupported surface format");
}
}
// TODO(p): Offer better integration, upgrade the bit depth if appropriate.
static FivIoImage *
fiv_io_profile_finalize(FivIoImage *image, FivIoProfile target)
{
if (!target)
return image;
for (FivIoImage *page = image; page != NULL; page = page->page_next)
fiv_io_profile_page(page, target, fiv_io_profile_any);
return image;
}
// --- Wuffs -------------------------------------------------------------------
static bool
pull_passthrough(const wuffs_base__more_information *minfo,
wuffs_base__io_buffer *src, wuffs_base__io_buffer *dst, GError **error)
{
wuffs_base__range_ie_u64 r =
wuffs_base__more_information__metadata_raw_passthrough__range(minfo);
if (wuffs_base__range_ie_u64__is_empty(&r))
return true;
// This should currently be zero, because we read files all at once.
uint64_t pos = src->meta.pos;
if (pos > r.min_incl ||
wuffs_base__u64__sat_sub(r.max_excl, pos) > src->meta.wi) {
set_error(error, "metadata is outside the read buffer");
return false;
}
// Mimic WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_TRANSFORM.
*dst = wuffs_base__make_io_buffer(src->data,
wuffs_base__make_io_buffer_meta(
wuffs_base__u64__sat_sub(r.max_excl, pos),
wuffs_base__u64__sat_sub(r.min_incl, pos), pos, TRUE));
// Seeking to the end of it seems to be a requirement in decode_gif.wuffs.
// Just not in case the block was empty. :^)
src->meta.ri = dst->meta.wi;
return true;
}
static GBytes *
pull_metadata(wuffs_base__image_decoder *dec, wuffs_base__io_buffer *src,
wuffs_base__more_information *minfo, GError **error)
{
uint8_t buf[8192] = {};
GByteArray *array = g_byte_array_new();
while (true) {
*minfo = wuffs_base__empty_more_information();
wuffs_base__io_buffer dst = wuffs_base__ptr_u8__writer(buf, sizeof buf);
wuffs_base__status status =
wuffs_base__image_decoder__tell_me_more(dec, &dst, minfo, src);
switch (minfo->flavor) {
case 0:
// Most likely as a result of an error, we'll handle that below.
case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_TRANSFORM:
// Wuffs is reading it into the buffer.
case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_PARSED:
// Use Wuffs accessor functions in the caller.
break;
default:
set_error(error, "Wuffs metadata API incompatibility");
goto fail;
case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_PASSTHROUGH:
// The insane case: error checking really should come first,
// and it can say "even more information". See decode_gif.wuffs.
if (!pull_passthrough(minfo, src, &dst, error))
goto fail;
}
g_byte_array_append(array, wuffs_base__io_buffer__reader_pointer(&dst),
wuffs_base__io_buffer__reader_length(&dst));
if (wuffs_base__status__is_ok(&status))
return g_byte_array_free_to_bytes(array);
if (status.repr != wuffs_base__suspension__even_more_information &&
status.repr != wuffs_base__suspension__short_write) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
}
fail:
g_byte_array_unref(array);
return NULL;
}
struct load_wuffs_frame_context {
wuffs_base__image_decoder *dec; ///< Wuffs decoder abstraction
wuffs_base__io_buffer *src; ///< Wuffs source buffer
wuffs_base__image_config cfg; ///< Wuffs image configuration
wuffs_base__slice_u8 workbuf; ///< Work buffer for Wuffs
wuffs_base__frame_config last_fc; ///< Previous frame configuration
uint32_t width; ///< Copied from cfg.pixcfg
uint32_t height; ///< Copied from cfg.pixcfg
cairo_format_t cairo_format; ///< Target format for surfaces
bool pack_16_10; ///< Custom copying swizzle for RGB30
bool expand_16_float; ///< Custom copying swizzle for RGBA128F
GBytes *meta_exif; ///< Reference-counted Exif
GBytes *meta_iccp; ///< Reference-counted ICC profile
GBytes *meta_xmp; ///< Reference-counted XMP
FivIoProfile target; ///< Target device profile, if any
FivIoProfile source; ///< Source colour profile, if any
FivIoImage *result; ///< The resulting image (referenced)
FivIoImage *result_tail; ///< The final animation frame
};
static bool
load_wuffs_frame(struct load_wuffs_frame_context *ctx, GError **error)
{
wuffs_base__frame_config fc = {};
wuffs_base__status status =
wuffs_base__image_decoder__decode_frame_config(ctx->dec, &fc, ctx->src);
if (status.repr == wuffs_base__note__end_of_data && ctx->result)
return false;
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
return false;
}
// TODO(p): Maybe pre-clear with
// wuffs_base__frame_config__background_color(&fc).
// Wuffs' test/data/animated-red-blue.gif, e.g., needs this handling.
cairo_format_t decode_format = ctx->cairo_format;
if (wuffs_base__frame_config__index(&fc) > 0 &&
wuffs_base__pixel_config__pixel_format(&ctx->cfg.pixcfg).repr ==
WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL)
decode_format = CAIRO_FORMAT_ARGB32;
unsigned char *targetbuf = NULL;
FivIoImage *image =
fiv_io_image_new(decode_format, ctx->width, ctx->height);
if (!image) {
set_error(error, "image allocation failure");
goto fail;
}
// There is no padding with ARGB/BGR/XRGB/BGRX.
// This function does not support a stride different from the width,
// maybe Wuffs internals do not either.
wuffs_base__pixel_buffer pb = {0};
if (ctx->expand_16_float || ctx->pack_16_10) {
uint32_t targetbuf_size = image->height * image->width * 8;
targetbuf = g_malloc(targetbuf_size);
status = wuffs_base__pixel_buffer__set_from_slice(&pb, &ctx->cfg.pixcfg,
wuffs_base__make_slice_u8(targetbuf, targetbuf_size));
} else {
status = wuffs_base__pixel_buffer__set_from_slice(&pb, &ctx->cfg.pixcfg,
wuffs_base__make_slice_u8(
image->data, image->stride * image->height));
}
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
status = wuffs_base__image_decoder__decode_frame(ctx->dec, &pb, ctx->src,
WUFFS_BASE__PIXEL_BLEND__SRC, ctx->workbuf, NULL);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
// The PNG decoder, at minimum, will flush any pixel data upon
// finding out that the input is truncated, so accept whatever we get.
}
if (ctx->target) {
if (ctx->expand_16_float || ctx->pack_16_10) {
fiv_io_profile_4x16le_direct(
targetbuf, ctx->width, ctx->height, ctx->source, ctx->target);
// The first one premultiplies below, the second doesn't need to.
} else {
fiv_io_profile_argb32_premultiply(image, ctx->source, ctx->target);
}
}
if (ctx->expand_16_float) {
g_debug("Wuffs to Cairo RGBA128F");
uint16_t *in = (uint16_t *) targetbuf;
float *out = (float *) image->data;
for (uint32_t y = 0; y < image->height; y++) {
for (uint32_t x = 0; x < image->width; x++) {
float b = *in++ / 65535., g = *in++ / 65535.,
r = *in++ / 65535., a = *in++ / 65535.;
*out++ = r * a;
*out++ = g * a;
*out++ = b * a;
*out++ = a;
}
}
} else if (ctx->pack_16_10) {
g_debug("Wuffs to Cairo RGB30");
uint16_t *in = (uint16_t *) targetbuf;
uint32_t *out = (uint32_t *) image->data;
for (uint32_t y = 0; y < image->height; y++) {
for (uint32_t x = 0; x < image->width; x++) {
uint32_t b = *in++, g = *in++, r = *in++, X = *in++;
*out++ = (X >> 14) << 30 |
(r >> 6) << 20 | (g >> 6) << 10 | (b >> 6);
}
}
}
// Single-frame images get a fast path, animations are are handled slowly:
if (wuffs_base__frame_config__index(&fc) > 0) {
// Copy the previous frame to a new image.
FivIoImage *prev = ctx->result_tail, *canvas = fiv_io_image_new(
prev->format, prev->width, prev->height);
if (!canvas) {
set_error(error, "image allocation failure");
goto fail;
}
memcpy(canvas->data, prev->data, prev->stride * prev->height);
// Apply that frame's disposal method.
// XXX: We do not expect opaque pictures to receive holes this way.
wuffs_base__rect_ie_u32 bounds =
wuffs_base__frame_config__bounds(&ctx->last_fc);
// TODO(p): This field needs to be colour-managed.
wuffs_base__color_u32_argb_premul bg =
wuffs_base__frame_config__background_color(&ctx->last_fc);
double a = (bg >> 24) / 255., r = 0, g = 0, b = 0;
if (a) {
r = (uint8_t) (bg >> 16) / 255. / a;
g = (uint8_t) (bg >> 8) / 255. / a;
b = (uint8_t) (bg) / 255. / a;
}
cairo_surface_t *surface = fiv_io_image_to_surface_noref(canvas);
cairo_t *cr = cairo_create(surface);
cairo_surface_destroy(surface);
switch (wuffs_base__frame_config__disposal(&ctx->last_fc)) {
case WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_BACKGROUND:
cairo_rectangle(cr, bounds.min_incl_x, bounds.min_incl_y,
bounds.max_excl_x - bounds.min_incl_x,
bounds.max_excl_y - bounds.min_incl_y);
cairo_set_source_rgba(cr, r, g, b, a);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_fill(cr);
break;
case WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_PREVIOUS:
// TODO(p): Implement, it seems tricky.
// Might need another surface to keep track of the state.
break;
case WUFFS_BASE__ANIMATION_DISPOSAL__NONE:
break;
}
// Paint the current frame over that, within its bounds.
bounds = wuffs_base__frame_config__bounds(&fc);
cairo_rectangle(cr, bounds.min_incl_x, bounds.min_incl_y,
bounds.max_excl_x - bounds.min_incl_x,
bounds.max_excl_y - bounds.min_incl_y);
cairo_clip(cr);
cairo_set_operator(cr,
wuffs_base__frame_config__overwrite_instead_of_blend(&fc)
? CAIRO_OPERATOR_SOURCE
: CAIRO_OPERATOR_OVER);
surface = fiv_io_image_to_surface_noref(image);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_surface_destroy(surface);
cairo_paint(cr);
cairo_destroy(cr);
fiv_io_image_unref(image);
image = canvas;
}
if (ctx->meta_exif)
image->exif = g_bytes_ref(ctx->meta_exif);
if (ctx->meta_iccp)
image->icc = g_bytes_ref(ctx->meta_iccp);
if (ctx->meta_xmp)
image->xmp = g_bytes_ref(ctx->meta_xmp);
image->loops = wuffs_base__image_decoder__num_animation_loops(ctx->dec);
image->frame_duration = wuffs_base__frame_config__duration(&fc) /
WUFFS_BASE__FLICKS_PER_MILLISECOND;
image->frame_previous = ctx->result_tail;
if (ctx->result_tail)
ctx->result_tail->frame_next = image;
else
ctx->result = image;
ctx->result_tail = image;
ctx->last_fc = fc;
g_free(targetbuf);
return wuffs_base__status__is_ok(&status);
fail:
g_clear_pointer(&image, fiv_io_image_unref);
g_clear_pointer(&ctx->result, fiv_io_image_unref);
ctx->result_tail = NULL;
g_free(targetbuf);
return false;
}
// https://github.com/google/wuffs/blob/main/example/gifplayer/gifplayer.c
// is pure C, and a good reference. I can't use the auxiliary libraries,
// since they depend on C++, which is undesirable.
static FivIoImage *
open_wuffs(wuffs_base__image_decoder *dec, wuffs_base__io_buffer src,
const FivIoOpenContext *ioctx, GError **error)
{
struct load_wuffs_frame_context ctx = {
.dec = dec, .src = &src, .target = ioctx->screen_profile};
// TODO(p): PNG text chunks, like we do with PNG thumbnails.
// TODO(p): See if something could and should be done about
// https://www.w3.org/TR/png-hdr-pq/
wuffs_base__image_decoder__set_report_metadata(
ctx.dec, WUFFS_BASE__FOURCC__EXIF, true);
wuffs_base__image_decoder__set_report_metadata(
ctx.dec, WUFFS_BASE__FOURCC__ICCP, true);
wuffs_base__image_decoder__set_report_metadata(
ctx.dec, WUFFS_BASE__FOURCC__SRGB, true);
wuffs_base__image_decoder__set_report_metadata(
ctx.dec, WUFFS_BASE__FOURCC__GAMA, true);
double gamma = 0;
while (true) {
wuffs_base__status status =
wuffs_base__image_decoder__decode_image_config(
ctx.dec, &ctx.cfg, ctx.src);
if (wuffs_base__status__is_ok(&status))
break;
if (status.repr != wuffs_base__note__metadata_reported) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
wuffs_base__more_information minfo = {};
GBytes *bytes = NULL;
if (!(bytes = pull_metadata(ctx.dec, ctx.src, &minfo, error)))
goto fail;
switch (wuffs_base__more_information__metadata__fourcc(&minfo)) {
case WUFFS_BASE__FOURCC__EXIF:
if (ctx.meta_exif) {
add_warning(ioctx, "ignoring repeated Exif");
break;
}
ctx.meta_exif = bytes;
continue;
case WUFFS_BASE__FOURCC__ICCP:
if (ctx.meta_iccp) {
add_warning(ioctx, "ignoring repeated ICC profile");
break;
}
ctx.meta_iccp = bytes;
continue;
case WUFFS_BASE__FOURCC__XMP:
if (ctx.meta_xmp) {
add_warning(ioctx, "ignoring repeated XMP");
break;
}
ctx.meta_xmp = bytes;
continue;
case WUFFS_BASE__FOURCC__SRGB:
gamma = 2.2;
break;
case WUFFS_BASE__FOURCC__GAMA:
gamma = 1e5 /
wuffs_base__more_information__metadata_parsed__gama(&minfo);
break;
}
g_bytes_unref(bytes);
}
// This, at least currently, seems excessive.
if (!wuffs_base__image_config__is_valid(&ctx.cfg)) {
set_error(error, "invalid Wuffs image configuration");
goto fail;
}
// We need to check because of the Cairo API.
ctx.width = wuffs_base__pixel_config__width(&ctx.cfg.pixcfg);
ctx.height = wuffs_base__pixel_config__height(&ctx.cfg.pixcfg);
if (ctx.width > INT_MAX || ctx.height > INT_MAX) {
set_error(error, "image dimensions overflow");
goto fail;
}
// TODO(p): Improve our simplistic PNG handling of: gAMA, cHRM, sRGB.
if (ctx.target) {
if (ctx.meta_iccp)
ctx.source = fiv_io_profile_new_from_bytes(ctx.meta_iccp);
else if (isfinite(gamma) && gamma > 0)
ctx.source = fiv_io_profile_new_sRGB_gamma(gamma);
}
// Wuffs maps tRNS to BGRA in `decoder.decode_trns?`, we should be fine.
// wuffs_base__pixel_format__transparency() doesn't reflect the image file.
bool opaque = wuffs_base__image_config__first_frame_is_opaque(&ctx.cfg);
// Wuffs' API is kind of awful--we want to catch wide RGB and wide grey.
wuffs_base__pixel_format srcfmt =
wuffs_base__pixel_config__pixel_format(&ctx.cfg.pixcfg);
uint32_t bpp = wuffs_base__pixel_format__bits_per_pixel(&srcfmt);
// Cairo doesn't support transparency with RGB30, so no premultiplication.
ctx.pack_16_10 = opaque && (bpp > 24 || (bpp < 24 && bpp > 8));
#ifdef FIV_CAIRO_RGBA128F
ctx.expand_16_float = !opaque && (bpp > 24 || (bpp < 24 && bpp > 8));
#endif // FIV_CAIRO_RGBA128F
// In Wuffs, /doc/note/pixel-formats.md declares "memory order", which,
// for our purposes, means big endian, and BGRA results in 32-bit ARGB
// on most machines.
//
// XXX: WUFFS_BASE__PIXEL_FORMAT__ARGB_PREMUL is not expressible, only RGBA.
// Wuffs doesn't support big-endian architectures at all, we might want to
// fall back to spng in such cases, or do a second conversion.
uint32_t wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL;
// CAIRO_FORMAT_ARGB32: "The 32-bit quantities are stored native-endian.
// Pre-multiplied alpha is used." CAIRO_FORMAT_RGB{24,30} are analogous.
ctx.cairo_format = CAIRO_FORMAT_ARGB32;
#ifdef FIV_CAIRO_RGBA128F
if (ctx.expand_16_float) {
wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE;
ctx.cairo_format = CAIRO_FORMAT_RGBA128F;
} else
#endif // FIV_CAIRO_RGBA128F
if (ctx.pack_16_10) {
// TODO(p): Make Wuffs support A2RGB30 as a destination format;
// in general, 16-bit depth swizzlers are stubbed.
// See also wuffs_base__pixel_swizzler__prepare__*().
wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE;
ctx.cairo_format = CAIRO_FORMAT_RGB30;
} else if (opaque) {
// BGRX doesn't have as wide swizzler support, namely in GIF.
// Moreover, follower frames may still be partly transparent.
// Therefore, we choose to keep "wuffs_format" intact.
ctx.cairo_format = CAIRO_FORMAT_RGB24;
} else if (!ctx.target) {
wuffs_format = WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL;
}
wuffs_base__pixel_config__set(&ctx.cfg.pixcfg, wuffs_format,
WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, ctx.width, ctx.height);
uint64_t workbuf_len_max_incl =
wuffs_base__image_decoder__workbuf_len(ctx.dec).max_incl;
if (workbuf_len_max_incl) {
ctx.workbuf = wuffs_base__malloc_slice_u8(malloc, workbuf_len_max_incl);
if (!ctx.workbuf.ptr) {
set_error(error, "failed to allocate a work buffer");
goto fail;
}
}
while (load_wuffs_frame(&ctx, error))
if (ioctx->first_frame_only)
break;
// Wrap the chain around, since our caller receives only one pointer.
if (ctx.result)
ctx.result->frame_previous = ctx.result_tail;
fail:
free(ctx.workbuf.ptr);
g_clear_pointer(&ctx.meta_exif, g_bytes_unref);
g_clear_pointer(&ctx.meta_iccp, g_bytes_unref);
g_clear_pointer(&ctx.meta_xmp, g_bytes_unref);
g_clear_pointer(&ctx.source, fiv_io_profile_free);
return ctx.result;
}
static FivIoImage *
open_wuffs_using(wuffs_base__image_decoder *(*allocate)(),
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
wuffs_base__image_decoder *dec = allocate();
if (!dec) {
set_error(error, "memory allocation failed or internal error");
return NULL;
}
FivIoImage *image =
open_wuffs(dec, wuffs_base__ptr_u8__reader((uint8_t *) data, len, TRUE),
ctx, error);
free(dec);
return image;
}
// --- Wuffs for PNG thumbnails ------------------------------------------------
static bool
pull_metadata_kvp(wuffs_png__decoder *dec, wuffs_base__io_buffer *src,
GHashTable *texts, gchar **key, GError **error)
{
wuffs_base__more_information minfo = {};
GBytes *bytes = NULL;
if (!(bytes = pull_metadata(
wuffs_png__decoder__upcast_as__wuffs_base__image_decoder(dec),
src, &minfo, error)))
return false;
switch (wuffs_base__more_information__metadata__fourcc(&minfo)) {
case WUFFS_BASE__FOURCC__KVPK:
g_assert(*key == NULL);
*key = g_strndup(
g_bytes_get_data(bytes, NULL), g_bytes_get_size(bytes));
break;
case WUFFS_BASE__FOURCC__KVPV:
g_assert(*key != NULL);
g_hash_table_insert(texts, *key, g_strndup(
g_bytes_get_data(bytes, NULL), g_bytes_get_size(bytes)));
*key = NULL;
}
g_bytes_unref(bytes);
return true;
}
// An uncomplicated variant of fiv_io_open(), might be up for refactoring.
FivIoImage *
fiv_io_open_png_thumbnail(const char *path, GError **error)
{
wuffs_png__decoder dec = {};
wuffs_base__status status = wuffs_png__decoder__initialize(
&dec, sizeof dec, WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
return NULL;
}
gchar *data = NULL;
gsize len = 0;
if (!g_file_get_contents(path, &data, &len, error))
return NULL;
wuffs_base__io_buffer src =
wuffs_base__ptr_u8__reader((uint8_t *) data, len, TRUE);
wuffs_png__decoder__set_report_metadata(
&dec, WUFFS_BASE__FOURCC__KVP, true);
wuffs_base__image_config cfg = {};
wuffs_base__slice_u8 workbuf = {};
FivIoImage *image = NULL;
bool success = false;
GHashTable *texts =
g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
gchar *key = NULL;
while (true) {
status = wuffs_png__decoder__decode_image_config(&dec, &cfg, &src);
if (wuffs_base__status__is_ok(&status))
break;
if (status.repr != wuffs_base__note__metadata_reported) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
if (!pull_metadata_kvp(&dec, &src, texts, &key, error))
goto fail;
}
g_assert(key == NULL);
uint32_t width = wuffs_base__pixel_config__width(&cfg.pixcfg);
uint32_t height = wuffs_base__pixel_config__height(&cfg.pixcfg);
if (width > INT16_MAX || height > INT16_MAX) {
set_error(error, "image dimensions overflow");
goto fail;
}
wuffs_base__pixel_config__set(&cfg.pixcfg,
WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL,
WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, width, height);
uint64_t workbuf_len_max_incl =
wuffs_png__decoder__workbuf_len(&dec).max_incl;
if (workbuf_len_max_incl) {
workbuf = wuffs_base__malloc_slice_u8(malloc, workbuf_len_max_incl);
if (!workbuf.ptr) {
set_error(error, "failed to allocate a work buffer");
goto fail;
}
}
image = fiv_io_image_new(
wuffs_base__image_config__first_frame_is_opaque(&cfg)
? CAIRO_FORMAT_RGB24
: CAIRO_FORMAT_ARGB32,
width, height);
if (!image) {
set_error(error, "image allocation failure");
goto fail;
}
wuffs_base__pixel_buffer pb = {};
status = wuffs_base__pixel_buffer__set_from_slice(&pb, &cfg.pixcfg,
wuffs_base__make_slice_u8(image->data, image->stride * image->height));
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
status = wuffs_png__decoder__decode_frame(&dec, &pb, &src,
WUFFS_BASE__PIXEL_BLEND__SRC, workbuf, NULL);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
// The specification does not say where the required metadata should be,
// it could very well be broken up into two parts.
wuffs_base__frame_config fc = {};
while (true) {
// Not interested in APNG, might even throw an error in that case.
status = wuffs_png__decoder__decode_frame_config(&dec, &fc, &src);
if (status.repr == wuffs_base__note__end_of_data ||
wuffs_base__status__is_ok(&status))
break;
if (status.repr != wuffs_base__note__metadata_reported) {
set_error(error, wuffs_base__status__message(&status));
goto fail;
}
if (!pull_metadata_kvp(&dec, &src, texts, &key, error))
goto fail;
}
g_assert(key == NULL);
image->text = g_hash_table_ref(texts);
success = true;
fail:
if (!success)
g_clear_pointer(&image, fiv_io_image_unref);
free(workbuf.ptr);
g_free(data);
g_hash_table_unref(texts);
return image;
}
// --- Multi-Picture Format ----------------------------------------------------
static uint32_t
parse_mpf_mpentry(const uint8_t *p, const struct tiffer *T)
{
uint32_t attrs = T->un->u32(p);
uint32_t offset = T->un->u32(p + 8);
enum {
TypeBaselineMPPrimaryImage = 0x030000,
TypeLargeThumbnailVGA = 0x010001,
TypeLargeThumbnailFullHD = 0x010002,
TypeMultiFrameImagePanorama = 0x020001,
TypeMultiFrameImageDisparity = 0x020002,
TypeMultiFrameImageMultiAngle = 0x020003,
TypeUndefined = 0x000000,
};
switch (attrs & 0xFFFFFF) {
case TypeLargeThumbnailVGA:
case TypeLargeThumbnailFullHD:
// Wasted cycles.
case TypeUndefined:
// Apple uses this for HDR and depth maps (same and lower resolution).
// TODO(p): It would be nice to be able to view them.
return 0;
}
// Don't report non-JPEGs, even though they're unlikely.
if (((attrs >> 24) & 0x7) != 0)
return 0;
return offset;
}
static uint32_t *
parse_mpf_index_entries(const struct tiffer *T, struct tiffer_entry *entry)
{
uint32_t count = entry->remaining_count / 16;
uint32_t *offsets = g_malloc0_n(sizeof *offsets, count + 1), *out = offsets;
for (uint32_t i = 0; i < count; i++) {
// 5.2.3.3.3. Individual Image Data Offset
uint32_t offset = parse_mpf_mpentry(entry->p + i * 16, T);
if (offset)
*out++ = offset;
}
return offsets;
}
static uint32_t *
parse_mpf_index_ifd(struct tiffer *T)
{
struct tiffer_entry entry = {};
while (tiffer_next_entry(T, &entry)) {
// 5.2.3.3. MP Entry
if (entry.tag == MPF_MPEntry && entry.type == TIFFER_UNDEFINED &&
!(entry.remaining_count % 16)) {
return parse_mpf_index_entries(T, &entry);
}
}
return NULL;
}
static bool
parse_mpf(
GPtrArray *individuals, const uint8_t *mpf, size_t len, size_t total_len)
{
struct tiffer T;
if (!tiffer_init(&T, mpf, len) || !tiffer_next_ifd(&T))
return false;
// First image: IFD0 is Index IFD, any IFD1 is Attribute IFD.
// Other images: IFD0 is Attribute IFD, there is no Index IFD.
uint32_t *offsets = parse_mpf_index_ifd(&T);
if (offsets) {
for (const uint32_t *o = offsets; *o; o++)
if (*o <= total_len)
g_ptr_array_add(individuals, (gpointer) mpf + *o);
free(offsets);
}
return true;
}
// --- JPEG --------------------------------------------------------------------
struct exif_profile {
double whitepoint[2]; ///< TIFF_WhitePoint
double primaries[6]; ///< TIFF_PrimaryChromaticities
enum Exif_ColorSpace colorspace; ///< Exif_ColorSpace
double gamma; ///< Exif_Gamma
bool have_whitepoint;
bool have_primaries;
bool have_colorspace;
bool have_gamma;
};
static bool
parse_exif_profile_reals(
const struct tiffer *T, struct tiffer_entry *entry, double *out)
{
while (tiffer_real(T, entry, out++))
if (!tiffer_next_value(entry))
return false;
return true;
}
static void
parse_exif_profile_subifd(
struct exif_profile *params, const struct tiffer *T, uint32_t offset)
{
struct tiffer subT = {};
if (!tiffer_subifd(T, offset, &subT))
return;
struct tiffer_entry entry = {};
while (tiffer_next_entry(&subT, &entry)) {
int64_t value = 0;
if (G_UNLIKELY(entry.tag == Exif_ColorSpace) &&
entry.type == TIFFER_SHORT && entry.remaining_count == 1 &&
tiffer_integer(&subT, &entry, &value)) {
params->have_colorspace = true;
params->colorspace = value;
} else if (G_UNLIKELY(entry.tag == Exif_Gamma) &&
entry.type == TIFFER_RATIONAL && entry.remaining_count == 1 &&
tiffer_real(&subT, &entry, &params->gamma)) {
params->have_gamma = true;
}
}
}
static FivIoProfile
parse_exif_profile(const void *data, size_t len)
{
struct tiffer T = {};
if (!tiffer_init(&T, (const uint8_t *) data, len) || !tiffer_next_ifd(&T))
return NULL;
struct exif_profile params = {};
struct tiffer_entry entry = {};
while (tiffer_next_entry(&T, &entry)) {
int64_t offset = 0;
if (G_UNLIKELY(entry.tag == TIFF_ExifIFDPointer) &&
entry.type == TIFFER_LONG && entry.remaining_count == 1 &&
tiffer_integer(&T, &entry, &offset) &&
offset >= 0 && offset <= UINT32_MAX) {
parse_exif_profile_subifd(&params, &T, offset);
} else if (G_UNLIKELY(entry.tag == TIFF_WhitePoint) &&
entry.type == TIFFER_RATIONAL &&
entry.remaining_count == G_N_ELEMENTS(params.whitepoint)) {
params.have_whitepoint =
parse_exif_profile_reals(&T, &entry, params.whitepoint);
} else if (G_UNLIKELY(entry.tag == TIFF_PrimaryChromaticities) &&
entry.type == TIFFER_RATIONAL &&
entry.remaining_count == G_N_ELEMENTS(params.primaries)) {
params.have_primaries =
parse_exif_profile_reals(&T, &entry, params.primaries);
}
}
if (!params.have_colorspace)
return NULL;
// If sRGB is claimed, assume all parameters are standard.
if (params.colorspace == Exif_ColorSpace_sRGB)
return fiv_io_profile_new_sRGB();
// AdobeRGB Nikon JPEGs provide all of these.
if (params.colorspace != Exif_ColorSpace_Uncalibrated ||
!params.have_gamma ||
!params.have_whitepoint ||
!params.have_primaries)
return NULL;
return fiv_io_profile_new_parametric(
params.gamma, params.whitepoint, params.primaries);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct jpeg_metadata {
GByteArray *exif; ///< Exif buffer or NULL
GByteArray *icc; ///< ICC profile buffer or NULL
GPtrArray *mpf; ///< Multi-Picture Format or NULL
int width; ///< Image width
int height; ///< Image height
};
static void
parse_jpeg_metadata(const char *data, size_t len, struct jpeg_metadata *meta)
{
// Because the JPEG file format is simple, just do it manually.
// See: https://www.w3.org/Graphics/JPEG/itu-t81.pdf
enum {
TEM = 0x01,
SOF0 = 0xC0, SOF1, SOF2, SOF3, DHT, SOF5, SOF6, SOF7,
JPG, SOF9, SOF10, SOF11, DAC, SOF13, SOF14, SOF15,
RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7,
SOI, EOI, SOS, DQT, DNL, DRI, DHP, EXP,
APP0, APP1, APP2, APP3, APP4, APP5, APP6, APP7,
};
int icc_sequence = 0, icc_done = FALSE;
const guint8 *p = (const guint8 *) data, *end = p + len;
while (p + 3 < end && *p++ == 0xFF && *p != SOS && *p != EOI) {
// The previous byte is a fill byte, restart.
if (*p == 0xFF)
continue;
// These markers stand alone, not starting a marker segment.
guint8 marker = *p++;
switch (marker) {
case RST0:
case RST1:
case RST2:
case RST3:
case RST4:
case RST5:
case RST6:
case RST7:
case SOI:
case TEM:
continue;
}
// Do not bother validating the structure.
guint16 length = p[0] << 8 | p[1];
const guint8 *payload = p + 2;
if (G_UNLIKELY((p += length) > end))
break;
switch (marker) {
case SOF0:
case SOF1:
case SOF2:
case SOF3:
case SOF5:
case SOF6:
case SOF7:
case SOF9:
case SOF10:
case SOF11:
case SOF13:
case SOF14:
case SOF15:
if (length >= 5) {
meta->width = (payload[3] << 8) + payload[4];
meta->height = (payload[1] << 8) + payload[2];
}
}
// https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf 4.7.2
// Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3
// Not checking the padding byte is intentional.
// XXX: Thumbnails may in practice overflow into follow-up segments.
if (meta->exif && marker == APP1 && p - payload >= 6 &&
!memcmp(payload, "Exif\0", 5) && !meta->exif->len) {
payload += 6;
g_byte_array_append(meta->exif, payload, p - payload);
}
// https://www.color.org/specification/ICC1v43_2010-12.pdf B.4
if (meta->icc && marker == APP2 && p - payload >= 14 &&
!memcmp(payload, "ICC_PROFILE\0", 12) && !icc_done &&
payload[12] == ++icc_sequence && payload[13] >= payload[12]) {
payload += 14;
g_byte_array_append(meta->icc, payload, p - payload);
icc_done = payload[-1] == icc_sequence;
}
// CIPA DC-007-2021 (Multi-Picture Format) 5.2
// https://www.cipa.jp/e/std/std-sec.html
if (meta->mpf && marker == APP2 && p - payload >= 8 &&
!memcmp(payload, "MPF\0", 4) && !meta->mpf->len) {
payload += 4;
parse_mpf(meta->mpf, payload, p - payload, end - payload);
}
// TODO(p): Extract the main XMP segment.
}
if (meta->icc && !icc_done)
g_byte_array_set_size(meta->icc, 0);
}
static FivIoImage *open_libjpeg_turbo(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error);
static void
load_jpeg_finalize(FivIoImage *image, bool cmyk,
const FivIoOpenContext *ctx, const char *data, size_t len)
{
struct jpeg_metadata meta = {
.exif = g_byte_array_new(),
.icc = g_byte_array_new(),
.mpf = g_ptr_array_new(),
};
parse_jpeg_metadata(data, len, &meta);
if (!ctx->first_frame_only) {
// XXX: This is ugly, as it relies on just the first individual image
// having any follow-up entries (as it should be).
FivIoImage *image_tail = image;
for (guint i = 0; i < meta.mpf->len; i++) {
const char *jpeg = meta.mpf->pdata[i];
GError *error = NULL;
if (!try_append_page(
open_libjpeg_turbo(jpeg, len - (jpeg - data), ctx, &error),
&image, &image_tail)) {
add_warning(ctx, "MPF image %d: %s", i + 2, error->message);
g_error_free(error);
}
}
}
g_ptr_array_free(meta.mpf, TRUE);
if (meta.exif->len)
image->exif = g_byte_array_free_to_bytes(meta.exif);
else
g_byte_array_free(meta.exif, TRUE);
GBytes *icc_profile = NULL;
if (meta.icc->len)
image->icc = icc_profile = g_byte_array_free_to_bytes(meta.icc);
else
g_byte_array_free(meta.icc, TRUE);
FivIoProfile source = NULL;
if (icc_profile)
source = fiv_io_profile_new(
g_bytes_get_data(icc_profile, NULL), g_bytes_get_size(icc_profile));
else if (image->exif)
source = parse_exif_profile(
g_bytes_get_data(image->exif, NULL), g_bytes_get_size(image->exif));
if (cmyk)
fiv_io_profile_cmyk(image, source, ctx->screen_profile);
else
fiv_io_profile_any(image, source, ctx->screen_profile);
if (source)
fiv_io_profile_free(source);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct libjpeg_error_mgr {
struct jpeg_error_mgr pub;
jmp_buf buf;
GError **error;
const FivIoOpenContext *ctx;
};
static void
libjpeg_error_exit(j_common_ptr cinfo)
{
struct libjpeg_error_mgr *err = (struct libjpeg_error_mgr *) cinfo->err;
char buf[JMSG_LENGTH_MAX] = "";
(*cinfo->err->format_message)(cinfo, buf);
set_error(err->error, buf);
longjmp(err->buf, 1);
}
static void
libjpeg_output_message(j_common_ptr cinfo)
{
struct libjpeg_error_mgr *err = (struct libjpeg_error_mgr *) cinfo->err;
char buf[JMSG_LENGTH_MAX] = "";
(*cinfo->err->format_message)(cinfo, buf);
add_warning(err->ctx, "%s", buf);
}
static FivIoImage *
load_libjpeg_turbo(const char *data, gsize len, const FivIoOpenContext *ctx,
void (*loop)(struct jpeg_decompress_struct *, JSAMPARRAY), GError **error)
{
FivIoImage *volatile image = NULL;
struct libjpeg_error_mgr jerr = {.error = error, .ctx = ctx};
struct jpeg_decompress_struct cinfo = {.err = jpeg_std_error(&jerr.pub)};
jerr.pub.error_exit = libjpeg_error_exit;
jerr.pub.output_message = libjpeg_output_message;
if (setjmp(jerr.buf)) {
g_clear_pointer(&image, fiv_io_image_unref);
jpeg_destroy_decompress(&cinfo);
return NULL;
}
jpeg_create_decompress(&cinfo);
jpeg_mem_src(&cinfo, (const unsigned char *) data, len);
(void) jpeg_read_header(&cinfo, true);
// TODO(p): With newer libjpeg-turbo, if cinfo.data_precision is 12 or 16,
// try to load it with higher precision.
bool use_cmyk = cinfo.jpeg_color_space == JCS_CMYK ||
cinfo.jpeg_color_space == JCS_YCCK;
if (use_cmyk)
cinfo.out_color_space = JCS_CMYK;
else if (G_BYTE_ORDER == G_BIG_ENDIAN)
cinfo.out_color_space = JCS_EXT_XRGB;
else
cinfo.out_color_space = JCS_EXT_BGRX;
jpeg_calc_output_dimensions(&cinfo);
int width = cinfo.output_width;
int height = cinfo.output_height;
// The limit of Cairo/pixman is 32767. but JPEG can go as high as 65535.
// Prevent Cairo from throwing an error, and make use of libjpeg's scaling.
// gdk-pixbuf circumvents this check, producing unrenderable surfaces.
const int max = 32767;
int nfs = 0;
tjscalingfactor *fs = tjGetScalingFactors(&nfs), f = {0, 1};
if (fs && (width > max || height > max)) {
for (int i = 0; i < nfs; i++) {
if (TJSCALED(width, fs[i]) <= max &&
TJSCALED(height, fs[i]) <= max &&
fs[i].num * f.denom > f.num * fs[i].denom)
f = fs[i];
}
add_warning(ctx,
"the image is too large, and had to be scaled by %d/%d",
f.num, f.denom);
width = TJSCALED(width, f);
height = TJSCALED(height, f);
cinfo.scale_num = f.num;
cinfo.scale_denom = f.denom;
}
image = fiv_io_image_new(CAIRO_FORMAT_RGB24, width, height);
if (!image) {
set_error(error, "image allocation failure");
longjmp(jerr.buf, 1);
}
JSAMPARRAY lines = (*cinfo.mem->alloc_small)(
(j_common_ptr) &cinfo, JPOOL_IMAGE, sizeof *lines * height);
for (int i = 0; i < height; i++)
lines[i] = image->data + i * image->stride;
// Slightly unfortunate generalization.
loop(&cinfo, lines);
load_jpeg_finalize(image, use_cmyk, ctx, data, len);
jpeg_destroy_decompress(&cinfo);
return image;
}
static void
load_libjpeg_simple(
struct jpeg_decompress_struct *cinfo, JSAMPARRAY lines)
{
(void) jpeg_start_decompress(cinfo);
while (cinfo->output_scanline < cinfo->output_height)
(void) jpeg_read_scanlines(cinfo, lines + cinfo->output_scanline,
cinfo->output_height - cinfo->output_scanline);
(void) jpeg_finish_decompress(cinfo);
}
#ifdef HAVE_JPEG_QS
static void
load_libjpeg_enhanced(
struct jpeg_decompress_struct *cinfo, JSAMPARRAY lines)
{
// Go for the maximum quality setting.
jpegqs_control_t opts = {
.flags = JPEGQS_DIAGONALS | JPEGQS_JOINT_YUV,
.threads = g_get_num_processors(),
.niter = 3,
};
// Waiting for https://github.com/ilyakurdyukov/jpeg-quantsmooth/issues/28
#if LIBJPEG_TURBO_VERSION_NUMBER < 2001090
opts.flags |= JPEGQS_UPSAMPLE_UV;
#endif
(void) jpegqs_start_decompress(cinfo, &opts);
while (cinfo->output_scanline < cinfo->output_height)
(void) jpeg_read_scanlines(cinfo, lines + cinfo->output_scanline,
cinfo->output_height - cinfo->output_scanline);
(void) jpegqs_finish_decompress(cinfo);
}
#else
#define load_libjpeg_enhanced load_libjpeg_simple
#endif
static FivIoImage *
open_libjpeg_turbo(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
return load_libjpeg_turbo(data, len, ctx,
ctx->enhance ? load_libjpeg_enhanced : load_libjpeg_simple,
error);
}
// --- WebP --------------------------------------------------------------------
static const char *
load_libwebp_error(VP8StatusCode err)
{
switch (err) {
case VP8_STATUS_OK:
return "OK";
case VP8_STATUS_OUT_OF_MEMORY:
return "out of memory";
case VP8_STATUS_INVALID_PARAM:
return "invalid parameter";
case VP8_STATUS_BITSTREAM_ERROR:
return "bitstream error";
case VP8_STATUS_UNSUPPORTED_FEATURE:
return "unsupported feature";
case VP8_STATUS_SUSPENDED:
return "suspended";
case VP8_STATUS_USER_ABORT:
return "user abort";
case VP8_STATUS_NOT_ENOUGH_DATA:
return "not enough data";
default:
return "general failure";
}
}
static FivIoImage *
load_libwebp_nonanimated(WebPDecoderConfig *config, const WebPData *wd,
const FivIoOpenContext *ctx, GError **error)
{
FivIoImage *image = fiv_io_image_new(
config->input.has_alpha ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
config->input.width, config->input.height);
if (!image) {
set_error(error, "image allocation failure");
return NULL;
}
config->options.use_threads = true;
config->output.width = config->input.width;
config->output.height = config->input.height;
config->output.is_external_memory = true;
config->output.u.RGBA.rgba = image->data;
config->output.u.RGBA.stride = image->stride;
config->output.u.RGBA.size = config->output.u.RGBA.stride * image->height;
bool premultiply = !ctx->screen_profile;
if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
config->output.colorspace = premultiply ? MODE_bgrA : MODE_BGRA;
else
config->output.colorspace = premultiply ? MODE_Argb : MODE_ARGB;
WebPIDecoder *idec = WebPIDecode(NULL, 0, config);
if (!idec) {
set_error(error, "WebP decoding error");
fiv_io_image_unref(image);
return NULL;
}
VP8StatusCode err = WebPIUpdate(idec, wd->bytes, wd->size);
int x = 0, y = 0, w = 0, h = 0;
(void) WebPIDecodedArea(idec, &x, &y, &w, &h);
WebPIDelete(idec);
if (err == VP8_STATUS_OK)
return image;
if (err != VP8_STATUS_SUSPENDED) {
g_set_error(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN, "%s: %s",
"WebP decoding error", load_libwebp_error(err));
fiv_io_image_unref(image);
return NULL;
}
add_warning(ctx, "image file is truncated");
if (config->input.has_alpha)
return image;
// Always use transparent black, rather than opaque black.
image->format = CAIRO_FORMAT_ARGB32;
return image;
}
static FivIoImage *
load_libwebp_frame(WebPAnimDecoder *dec, const WebPAnimInfo *info,
int *last_timestamp, GError **error)
{
uint8_t *buf = NULL;
int timestamp = 0;
if (!WebPAnimDecoderGetNext(dec, &buf, &timestamp)) {
set_error(error, "WebP decoding error");
return NULL;
}
uint64_t area = info->canvas_width * info->canvas_height;
FivIoImage *image = fiv_io_image_new(CAIRO_FORMAT_RGB24,
info->canvas_width, info->canvas_height);
if (!image) {
set_error(error, "image allocation failure");
return NULL;
}
uint32_t *dst = (uint32_t *) image->data;
if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
memcpy(dst, buf, area * sizeof *dst);
} else {
uint32_t *src = (uint32_t *) buf;
for (uint64_t i = 0; i < area; i++)
*dst++ = GUINT32_FROM_LE(*src++);
}
// info->bgcolor is not reliable.
for (const uint32_t *p = dst, *end = dst + area; p < end; p++)
if ((~*p & 0xff000000)) {
image->format = CAIRO_FORMAT_ARGB32;
break;
}
// This API is confusing and awkward.
image->frame_duration = timestamp - *last_timestamp;
*last_timestamp = timestamp;
return image;
}
static FivIoImage *
load_libwebp_animated(
const WebPData *wd, const FivIoOpenContext *ctx, GError **error)
{
bool premultiply = !ctx->screen_profile;
WebPAnimDecoderOptions options = {};
WebPAnimDecoderOptionsInit(&options);
options.use_threads = true;
options.color_mode = premultiply ? MODE_bgrA : MODE_BGRA;
WebPAnimInfo info = {};
WebPAnimDecoder *dec = WebPAnimDecoderNew(wd, &options);
WebPAnimDecoderGetInfo(dec, &info);
FivIoImage *frames = NULL, *frames_tail = NULL;
if (info.canvas_width > INT_MAX || info.canvas_height > INT_MAX) {
set_error(error, "image dimensions overflow");
goto fail;
}
int last_timestamp = 0;
while (WebPAnimDecoderHasMoreFrames(dec)) {
FivIoImage *image =
load_libwebp_frame(dec, &info, &last_timestamp, error);
if (!image) {
g_clear_pointer(&frames, fiv_io_image_unref);
goto fail;
}
if (frames_tail)
frames_tail->frame_next = image;
else
frames = image;
image->frame_previous = frames_tail;
frames_tail = image;
}
if (frames) {
frames->frame_previous = frames_tail;
} else {
set_error(error, "the animation has no frames");
g_clear_pointer(&frames, fiv_io_image_unref);
}
fail:
WebPAnimDecoderDelete(dec);
return frames;
}
static FivIoImage *
open_libwebp(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
// It is wholly zero-initialized by libwebp.
WebPDecoderConfig config = {};
if (!WebPInitDecoderConfig(&config)) {
set_error(error, "libwebp version mismatch");
return NULL;
}
// TODO(p): Differentiate between a bad WebP, and not a WebP.
VP8StatusCode err = 0;
WebPData wd = {.bytes = (const uint8_t *) data, .size = len};
if ((err = WebPGetFeatures(wd.bytes, wd.size, &config.input))) {
g_set_error(error, FIV_IO_ERROR, FIV_IO_ERROR_OPEN,
"%s: %s", "WebP decoding error", load_libwebp_error(err));
return NULL;
}
FivIoImage *result = config.input.has_animation
? load_libwebp_animated(&wd, ctx, error)
: load_libwebp_nonanimated(&config, &wd, ctx, error);
if (!result)
goto fail;
// Of course everything has to use a different abstraction.
WebPDemuxState state = WEBP_DEMUX_PARSE_ERROR;
WebPDemuxer *demux = WebPDemuxPartial(&wd, &state);
if (!demux) {
add_warning(ctx, "demux failure while reading metadata");
goto fail;
}
// Releasing the demux chunk iterator is actually a no-op.
WebPChunkIterator chunk_iter = {};
uint32_t flags = WebPDemuxGetI(demux, WEBP_FF_FORMAT_FLAGS);
if ((flags & EXIF_FLAG) &&
WebPDemuxGetChunk(demux, "EXIF", 1, &chunk_iter)) {
result->exif =
g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size);
WebPDemuxReleaseChunkIterator(&chunk_iter);
}
if ((flags & ICCP_FLAG) &&
WebPDemuxGetChunk(demux, "ICCP", 1, &chunk_iter)) {
result->icc =
g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size);
WebPDemuxReleaseChunkIterator(&chunk_iter);
}
if ((flags & XMP_FLAG) &&
WebPDemuxGetChunk(demux, "XMP ", 1, &chunk_iter)) {
result->xmp =
g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size);
WebPDemuxReleaseChunkIterator(&chunk_iter);
}
if (WebPDemuxGetChunk(demux, "THUM", 1, &chunk_iter)) {
result->thum =
g_bytes_new(chunk_iter.chunk.bytes, chunk_iter.chunk.size);
WebPDemuxReleaseChunkIterator(&chunk_iter);
}
if (flags & ANIMATION_FLAG)
result->loops = WebPDemuxGetI(demux, WEBP_FF_LOOP_COUNT);
WebPDemuxDelete(demux);
if (ctx->screen_profile)
fiv_io_profile_argb32_premultiply_page(result, ctx->screen_profile);
fail:
WebPFreeDecBuffer(&config.output);
return result;
}
// --- TIFF/EP + DNG -----------------------------------------------------------
// In Nikon NEF files, which claim to be TIFF/EP-compatible, IFD0 is a tiny
// uncompressed thumbnail with SubIFDs that, aside from raw sensor data,
// typically contain a nearly full-size JPEG preview.
//
// LibRaw takes too long a time to render something that will never be as good
// as that large preview--e.g., due to exposure correction or denoising.
// While since version 0.21.0 the library provides an API that would allow us
// to extract the JPEG, a little bit of custom processing won't hurt either.
// TODO(p): Though it can also extract thumbnails from many more formats,
// so maybe keep this code as a fallback for old or missing LibRaw.
//
// Note that libtiff can only read the horrible IFD0 thumbnail.
// (TIFFSetSubDirectory() requires an ImageLength tag that's missing from JPEG
// SubIFDs, and TIFFReadCustomDirectory() takes a privately defined struct that
// may not be omitted.)
static bool
tiffer_find(const struct tiffer *self, uint16_t tag, struct tiffer_entry *entry)
{
// Note that we could employ binary search, because tags must be ordered:
// - TIFF 6.0: Sort Order
// - ISO/DIS 12234-2: 4.1.2, 5.1
// - CIPA DC-007-2009 (Multi-Picture Format): 5.2.3., 5.2.4.
// - CIPA DC-008-2019 (Exif 2.32): 4.6.2.
// However, it doesn't seem to warrant the ugly code.
struct tiffer T = *self;
while (tiffer_next_entry(&T, entry)) {
if (entry->tag == tag)
return true;
}
*entry = (struct tiffer_entry) {};
return false;
}
static bool
tiffer_find_integer(const struct tiffer *self, uint16_t tag, int64_t *i)
{
struct tiffer_entry entry = {};
return tiffer_find(self, tag, &entry) && tiffer_integer(self, &entry, i);
}
// In case of failure, an entry with a zero "remaining_count" is returned.
static struct tiffer_entry
tiff_ep_subifds_init(const struct tiffer *T)
{
struct tiffer_entry entry = {};
(void) tiffer_find(T, TIFF_SubIFDs, &entry);
return entry;
}
static bool
tiff_ep_subifds_next(
const struct tiffer *T, struct tiffer_entry *subifds, struct tiffer *subT)
{
// XXX: Except for a zero "remaining_count", all conditions are errors,
// and should perhaps be reported.
int64_t offset = 0;
if (!tiffer_integer(T, subifds, &offset) ||
offset < 0 || offset > UINT32_MAX || !tiffer_subifd(T, offset, subT))
return false;
(void) tiffer_next_value(subifds);
return true;
}
static bool
tiff_ep_find_main(const struct tiffer *T, struct tiffer *outputT)
{
// This is a mandatory field.
int64_t type = 0;
if (!tiffer_find_integer(T, TIFF_NewSubfileType, &type))
return false;
// This is the main image.
// (See DNG rather than ISO/DIS 12234-2 for values.)
if (type == 0) {
*outputT = *T;
return true;
}
struct tiffer_entry subifds = tiff_ep_subifds_init(T);
struct tiffer subT = {};
while (tiff_ep_subifds_next(T, &subifds, &subT))
if (tiff_ep_find_main(&subT, outputT))
return true;
return false;
}
struct tiff_ep_jpeg {
const uint8_t *jpeg; ///< JPEG data stream
size_t jpeg_length; ///< JPEG data stream length
int64_t pixels; ///< Number of pixels in the JPEG
};
static void
tiff_ep_find_jpeg_evaluate(const struct tiffer *T, struct tiff_ep_jpeg *out)
{
// This is a mandatory field.
int64_t compression = 0;
if (!tiffer_find_integer(T, TIFF_Compression, &compression))
return;
uint16_t tag_pointer = 0, tag_length = 0;
switch (compression) {
// This is how Exif specifies it, which doesn't follow TIFF 6.0.
case TIFF_Compression_JPEG:
tag_pointer = TIFF_JPEGInterchangeFormat;
tag_length = TIFF_JPEGInterchangeFormatLength;
break;
// Theoretically, there may be more strips, but this is not expected.
case TIFF_Compression_JPEGDatastream:
tag_pointer = TIFF_StripOffsets;
tag_length = TIFF_StripByteCounts;
break;
default:
return;
}
int64_t ipointer = 0, ilength = 0;
if (!tiffer_find_integer(T, tag_pointer, &ipointer) || ipointer <= 0 ||
!tiffer_find_integer(T, tag_length, &ilength) || ilength <= 0 ||
ipointer > T->end - T->begin ||
T->end - T->begin - ipointer < ilength)
return;
// Note that to get the largest JPEG,
// we don't need to descend into Exif thumbnails.
// TODO(p): Consider DNG 1.2.0.0 PreviewColorSpace.
// But first, try to find some real-world files with it.
const uint8_t *jpeg = T->begin + ipointer;
size_t jpeg_length = ilength;
struct jpeg_metadata meta = {};
parse_jpeg_metadata((const char *) jpeg, jpeg_length, &meta);
int64_t pixels = meta.width * meta.height;
if (pixels > out->pixels) {
out->jpeg = jpeg;
out->jpeg_length = jpeg_length;
out->pixels = pixels;
}
}
static bool
tiff_ep_find_jpeg(const struct tiffer *T, struct tiff_ep_jpeg *out)
{
// This is a mandatory field.
int64_t type = 0;
if (!tiffer_find_integer(T, TIFF_NewSubfileType, &type))
return false;
// This is a thumbnail of the main image.
// (See DNG rather than ISO/DIS 12234-2 for values.)
if (type == 1)
tiff_ep_find_jpeg_evaluate(T, out);
struct tiffer_entry subifds = tiff_ep_subifds_init(T);
struct tiffer subT = {};
while (tiff_ep_subifds_next(T, &subifds, &subT))
if (!tiff_ep_find_jpeg(&subT, out))
return false;
return true;
}
static FivIoImage *
load_tiff_ep(
const struct tiffer *T, const FivIoOpenContext *ctx, GError **error)
{
// ISO/DIS 12234-2 is a fuck-up that says this should be in "IFD0",
// but it might have intended to say "all top-level IFDs".
// The DNG specification shares the same problem.
//
// In any case, chained TIFFs are relatively rare.
struct tiffer_entry entry = {};
bool is_tiffep = tiffer_find(T, TIFF_TIFF_EPStandardID, &entry) &&
entry.type == TIFFER_BYTE && entry.remaining_count == 4 &&
entry.p[0] == 1 && !entry.p[1] && !entry.p[2] && !entry.p[3];
// Apple ProRAW, e.g., does not claim TIFF/EP compatibility,
// but we should still be able to make sense of it.
bool is_supported_dng = tiffer_find(T, TIFF_DNGBackwardVersion, &entry) &&
entry.type == TIFFER_BYTE && entry.remaining_count == 4 &&
entry.p[0] == 1 && entry.p[1] <= 6 && !entry.p[2] && !entry.p[3];
if (!is_tiffep && !is_supported_dng) {
set_error(error, "not a supported TIFF/EP or DNG image");
return NULL;
}
struct tiffer fullT = {};
if (!tiff_ep_find_main(T, &fullT)) {
set_error(error, "could not find a main image");
return NULL;
}
int64_t width = 0, height = 0;
if (!tiffer_find_integer(&fullT, TIFF_ImageWidth, &width) ||
!tiffer_find_integer(&fullT, TIFF_ImageLength, &height) ||
width <= 0 || height <= 0) {
set_error(error, "missing or invalid main image dimensions");
return NULL;
}
struct tiff_ep_jpeg out = {};
if (!tiff_ep_find_jpeg(T, &out)) {
set_error(error, "error looking for a full-size JPEG preview");
return NULL;
}
// Nikon NEFs seem to generally have a preview above 99 percent,
// (though some of them may not even reach 50 percent).
// Be a bit more generous than that with our crop tolerance.
// TODO(p): Also take into account DNG DefaultCropSize, if present.
if (out.pixels / ((double) width * height) < 0.95) {
set_error(error, "could not find a large enough JPEG preview");
return NULL;
}
FivIoImage *image = open_libjpeg_turbo(
(const char *) out.jpeg, out.jpeg_length, ctx, error);
if (!image)
return NULL;
// Note that Exif may override this later in fiv_io_open_from_data().
// TODO(p): Try to use the Orientation field nearest to the target IFD.
// IFD0 just happens to be fine for Nikon NEF.
int64_t orientation = 0;
if (tiffer_find_integer(T, TIFF_Orientation, &orientation) &&
orientation >= 1 && orientation <= 8) {
image->orientation = orientation;
}
// XXX: AdobeRGB Nikon NEFs can only be distinguished by a ColorSpace tag
// from within their MakerNote.
return image;
}
static FivIoImage *
open_tiff_ep(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
// -Wunused-function, we might want to give this its own compile unit.
(void) tiffer_real;
struct tiffer T = {};
if (!tiffer_init(&T, (const uint8_t *) data, len)) {
set_error(error, "not a TIFF file");
return NULL;
}
FivIoImage *result = NULL, *result_tail = NULL;
while (tiffer_next_ifd(&T)) {
if (!try_append_page(
load_tiff_ep(&T, ctx, error), &result, &result_tail)) {
g_clear_pointer(&result, fiv_io_image_unref);
return NULL;
}
if (ctx->first_frame_only)
break;
// TODO(p): Try to adjust tiffer so that this isn't necessary.
struct tiffer_entry dummy = {};
while (tiffer_next_entry(&T, &dummy))
;
}
return result;
}
// --- Optional dependencies ---------------------------------------------------
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
static FivIoImage *
load_libraw(libraw_data_t *iprc, GError **error)
{
int err = 0;
if ((err = libraw_unpack(iprc))) {
set_error(error, libraw_strerror(err));
return NULL;
}
#if 0
// TODO(p): I'm not sure when this is necessary or useful yet.
if ((err = libraw_adjust_sizes_info_only(iprc))) {
set_error(error, libraw_strerror(err));
return NULL;
}
#endif
// TODO(p): Documentation says I should look at the code and do it myself.
if ((err = libraw_dcraw_process(iprc))) {
set_error(error, libraw_strerror(err));
return NULL;
}
// FIXME: This is shittily written to iterate over the range of
// idata.colors, and will be naturally slow.
libraw_processed_image_t *image = libraw_dcraw_make_mem_image(iprc, &err);
if (!image) {
set_error(error, libraw_strerror(err));
return NULL;
}
// This should have been transformed, and kept, respectively.
if (image->colors != 3 || image->bits != 8) {
set_error(error, "unexpected number of colours, or bit depth");
libraw_dcraw_clear_mem(image);
return NULL;
}
FivIoImage *I =
fiv_io_image_new(CAIRO_FORMAT_RGB24, image->width, image->height);
if (!I) {
set_error(error, "image allocation failure");
libraw_dcraw_clear_mem(image);
return NULL;
}
uint32_t *pixels = (uint32_t *) I->data;
unsigned char *p = image->data;
for (ushort y = 0; y < image->height; y++) {
for (ushort x = 0; x < image->width; x++) {
*pixels++ = 0xff000000 | (uint32_t) p[0] << 16 |
(uint32_t) p[1] << 8 | (uint32_t) p[2];
p += 3;
}
}
libraw_dcraw_clear_mem(image);
return I;
}
static FivIoImage *
open_libraw(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
// https://github.com/LibRaw/LibRaw/issues/418
libraw_data_t *iprc = libraw_init(
LIBRAW_OPIONS_NO_MEMERR_CALLBACK | LIBRAW_OPIONS_NO_DATAERR_CALLBACK);
if (!iprc) {
set_error(error, "failed to obtain a LibRaw handle");
return NULL;
}
// TODO(p): Check if we need to set anything for autorotation (sizes.flip).
iprc->params.use_camera_wb = 1;
iprc->params.output_color = 1; // sRGB, TODO(p): Is this used?
iprc->params.output_bps = 8; // This should be the default value.
int err = 0;
FivIoImage *result = NULL, *result_tail = NULL;
if ((err = libraw_open_buffer(iprc, (const void *) data, len))) {
set_error(error, libraw_strerror(err));
goto out;
}
if (!try_append_page(load_libraw(iprc, error), &result, &result_tail) ||
ctx->first_frame_only)
goto out;
for (unsigned i = 1; i < iprc->idata.raw_count; i++) {
iprc->rawparams.shot_select = i;
// This library is terrible, we need to start again.
if ((err = libraw_open_buffer(iprc, (const void *) data, len))) {
set_error(error, libraw_strerror(err));
g_clear_pointer(&result, fiv_io_image_unref);
goto out;
}
if (!try_append_page(load_libraw(iprc, error), &result, &result_tail)) {
g_clear_pointer(&result, fiv_io_image_unref);
goto out;
}
}
out:
libraw_close(iprc);
return fiv_io_profile_finalize(result, ctx->screen_profile);
}
#endif // HAVE_LIBRAW ---------------------------------------------------------
#ifdef HAVE_RESVG // ----------------------------------------------------------
typedef struct {
FivIoRenderClosure parent;
resvg_render_tree *tree; ///< Loaded resvg tree
double width; ///< Normal width
double height; ///< Normal height
} FivIoRenderClosureResvg;
static void
load_resvg_destroy(FivIoRenderClosure *closure)
{
FivIoRenderClosureResvg *self = (void *) closure;
resvg_tree_destroy(self->tree);
g_free(self);
}
static FivIoImage *
load_resvg_render_internal(FivIoRenderClosureResvg *self,
double scale, FivIoProfile target, GError **error)
{
double w = ceil(self->width * scale), h = ceil(self->height * scale);
if (w > SHRT_MAX || h > SHRT_MAX) {
set_error(error, "image dimensions overflow");
return NULL;
}
FivIoImage *image = fiv_io_image_new(CAIRO_FORMAT_ARGB32, w, h);
if (!image) {
set_error(error, "image allocation failure");
return NULL;
}
uint32_t *pixels = (uint32_t *) image->data;
#if RESVG_MAJOR_VERSION == 0 && RESVG_MINOR_VERSION < 33
resvg_fit_to fit_to = {
scale == 1 ? RESVG_FIT_TO_TYPE_ORIGINAL : RESVG_FIT_TO_TYPE_ZOOM,
scale};
resvg_render(self->tree, fit_to, resvg_transform_identity(),
image->width, image->height, (char *) pixels);
#else
resvg_render(self->tree, (resvg_transform) {.a = scale, .d = scale},
image->width, image->height, (char *) pixels);
#endif
for (int i = 0; i < w * h; i++) {
uint32_t rgba = g_ntohl(pixels[i]);
pixels[i] = rgba << 24 | rgba >> 8;
}
return fiv_io_profile_finalize(image, target);
}
static FivIoImage *
load_resvg_render(
FivIoRenderClosure *closure, FivIoProfile target, double scale)
{
FivIoRenderClosureResvg *self = (FivIoRenderClosureResvg *) closure;
return load_resvg_render_internal(self, scale, target, NULL);
}
static const char *
load_resvg_error(int err)
{
switch (err) {
case RESVG_ERROR_NOT_AN_UTF8_STR:
return "not a UTF-8 string";
case RESVG_ERROR_FILE_OPEN_FAILED:
return "I/O failure";
case RESVG_ERROR_MALFORMED_GZIP:
return "malformed gzip";
case RESVG_ERROR_ELEMENTS_LIMIT_REACHED:
return "element limit reached";
case RESVG_ERROR_INVALID_SIZE:
return "invalid or unspecified image size";
case RESVG_ERROR_PARSING_FAILED:
return "parsing failed";
default:
return "general failure";
}
}
static FivIoImage *
open_resvg(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
GFile *file = g_file_new_for_uri(ctx->uri);
GFile *base_file = g_file_get_parent(file);
g_object_unref(file);
resvg_options *opt = resvg_options_create();
resvg_options_load_system_fonts(opt);
if (base_file)
resvg_options_set_resources_dir(opt, g_file_peek_path(base_file));
if (ctx->screen_dpi)
resvg_options_set_dpi(opt, ctx->screen_dpi);
resvg_render_tree *tree = NULL;
int err = resvg_parse_tree_from_data(data, len, opt, &tree);
resvg_options_destroy(opt);
g_clear_object(&base_file);
if (err != RESVG_OK) {
set_error(error, load_resvg_error(err));
return NULL;
}
// TODO(p): See if there is a situation for resvg_get_image_viewbox().
resvg_size size = resvg_get_image_size(tree);
FivIoRenderClosureResvg *closure = g_malloc0(sizeof *closure);
closure->parent.render = load_resvg_render;
closure->parent.destroy = load_resvg_destroy;
closure->tree = tree;
closure->width = size.width;
closure->height = size.height;
FivIoImage *image =
load_resvg_render_internal(closure, 1., ctx->screen_profile, error);
if (!image) {
load_resvg_destroy(&closure->parent);
return NULL;
}
image->render = &closure->parent;
return image;
}
#endif // HAVE_RESVG ----------------------------------------------------------
#ifdef HAVE_LIBRSVG // --------------------------------------------------------
typedef struct {
FivIoRenderClosure parent;
RsvgHandle *handle; ///< Loaded rsvg handle
double width; ///< Normal width
double height; ///< Normal height
} FivIoRenderClosureLibrsvg;
static void
load_librsvg_destroy(FivIoRenderClosure *closure)
{
FivIoRenderClosureLibrsvg *self = (void *) closure;
g_object_unref(self->handle);
g_free(self);
}
static FivIoImage *
load_librsvg_render_internal(FivIoRenderClosureLibrsvg *self, double scale,
FivIoProfile target, GError **error)
{
RsvgRectangle viewport = {.x = 0, .y = 0,
.width = self->width * scale, .height = self->height * scale};
FivIoImage *image = fiv_io_image_new(
CAIRO_FORMAT_ARGB32, ceil(viewport.width), ceil(viewport.height));
if (!image) {
set_error(error, "image allocation failure");
return NULL;
}
cairo_surface_t *surface = fiv_io_image_to_surface_noref(image);
cairo_t *cr = cairo_create(surface);
cairo_surface_destroy(surface);
gboolean success =
rsvg_handle_render_document(self->handle, cr, &viewport, error);
cairo_status_t status = cairo_status(cr);
cairo_destroy(cr);
if (!success) {
fiv_io_image_unref(image);
return NULL;
}
if (status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(status));
fiv_io_image_unref(image);
return NULL;
}
return fiv_io_profile_finalize(image, target);
}
static FivIoImage *
load_librsvg_render(
FivIoRenderClosure *closure, FivIoProfile target, double scale)
{
FivIoRenderClosureLibrsvg *self = (FivIoRenderClosureLibrsvg *) closure;
return load_librsvg_render_internal(self, scale, target, NULL);
}
static FivIoImage *
open_librsvg(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
GFile *base_file = g_file_new_for_uri(ctx->uri);
GInputStream *is = g_memory_input_stream_new_from_data(data, len, NULL);
RsvgHandle *handle = rsvg_handle_new_from_stream_sync(
is, base_file, RSVG_HANDLE_FLAG_KEEP_IMAGE_DATA, NULL, error);
g_object_unref(base_file);
g_object_unref(is);
if (!handle)
return NULL;
rsvg_handle_set_dpi(handle, ctx->screen_dpi);
double w = 0, h = 0;
#if LIBRSVG_CHECK_VERSION(2, 51, 0)
if (!rsvg_handle_get_intrinsic_size_in_pixels(handle, &w, &h)) {
#else
RsvgDimensionData dd = {};
rsvg_handle_get_dimensions(handle, &dd);
if ((w = dd.width) <= 0 || (h = dd.height) <= 0) {
#endif
RsvgRectangle viewbox = {};
gboolean has_viewport = FALSE;
rsvg_handle_get_intrinsic_dimensions(
handle, NULL, NULL, NULL, NULL, &has_viewport, &viewbox);
if (!has_viewport) {
set_error(error, "cannot compute pixel dimensions");
g_object_unref(handle);
return NULL;
}
w = viewbox.width;
h = viewbox.height;
}
FivIoRenderClosureLibrsvg *closure = g_malloc0(sizeof *closure);
closure->parent.render = load_librsvg_render;
closure->parent.destroy = load_librsvg_destroy;
closure->handle = handle;
closure->width = w;
closure->height = h;
// librsvg rasterizes filters, so rendering to a recording Cairo surface
// has been abandoned.
FivIoImage *image =
load_librsvg_render_internal(closure, 1., ctx->screen_profile, error);
if (!image) {
load_librsvg_destroy(&closure->parent);
return NULL;
}
image->render = &closure->parent;
return image;
}
#endif // HAVE_LIBRSVG --------------------------------------------------------
#ifdef HAVE_XCURSOR //---------------------------------------------------------
// fmemopen is part of POSIX-1.2008, this exercise is technically unnecessary.
// libXcursor checks for EOF rather than -1, it may eat your hamster.
struct fiv_io_xcursor {
XcursorFile parent;
unsigned char *data;
long position, len;
};
static int
fiv_io_xcursor_read(XcursorFile *file, unsigned char *buf, int len)
{
struct fiv_io_xcursor *fix = (struct fiv_io_xcursor *) file;
if (fix->position < 0 || fix->position > fix->len) {
errno = EOVERFLOW;
return -1;
}
long n = MIN(fix->len - fix->position, len);
if (n > G_MAXINT) {
errno = EIO;
return -1;
}
memcpy(buf, fix->data + fix->position, n);
fix->position += n;
return n;
}
static int
fiv_io_xcursor_write(G_GNUC_UNUSED XcursorFile *file,
G_GNUC_UNUSED unsigned char *buf, G_GNUC_UNUSED int len)
{
errno = EBADF;
return -1;
}
static int
fiv_io_xcursor_seek(XcursorFile *file, long offset, int whence)
{
struct fiv_io_xcursor *fix = (struct fiv_io_xcursor *) file;
switch (whence) {
case SEEK_SET:
fix->position = offset;
break;
case SEEK_CUR:
fix->position += offset;
break;
case SEEK_END:
fix->position = fix->len + offset;
break;
default:
errno = EINVAL;
return -1;
}
// This is technically too late for fseek(), but libXcursor doesn't care.
if (fix->position < 0) {
errno = EINVAL;
return -1;
}
return fix->position;
}
static const XcursorFile fiv_io_xcursor_adaptor = {
.closure = NULL,
.read = fiv_io_xcursor_read,
.write = fiv_io_xcursor_write,
.seek = fiv_io_xcursor_seek,
};
static FivIoImage *
open_xcursor(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
if (len > G_MAXLONG) {
set_error(error, "size overflow");
return NULL;
}
struct fiv_io_xcursor file = {
.parent = fiv_io_xcursor_adaptor,
.data = (unsigned char *) data,
.position = 0,
.len = len,
};
XcursorImages *images = XcursorXcFileLoadAllImages(&file.parent);
if (!images) {
set_error(error, "general failure");
return NULL;
}
// Interpret cursors as animated pages.
FivIoImage *pages = NULL, *frames_head = NULL, *frames_tail = NULL;
// XXX: Assuming that all "nominal sizes" have the same dimensions.
XcursorDim last_nominal = -1;
for (int i = 0; i < images->nimage; i++) {
XcursorImage *image = images->images[i];
FivIoImage *I =
fiv_io_image_new(CAIRO_FORMAT_ARGB32, image->width, image->height);
if (!I) {
add_warning(ctx, "%s", "image allocation failure");
break;
}
// The library automatically byte swaps in _XcursorReadImage().
memcpy(I->data, image->pixels, I->stride * I->height);
I->frame_duration = image->delay;
if (pages && image->size == last_nominal) {
I->frame_previous = frames_tail;
frames_tail->frame_next = I;
} else if (frames_head) {
frames_head->frame_previous = frames_tail;
frames_head->page_next = I;
I->page_previous = frames_head;
frames_head = I;
} else {
pages = frames_head = I;
}
frames_tail = I;
last_nominal = image->size;
}
XcursorImagesDestroy(images);
if (!pages)
return NULL;
// Wrap around animations in the last page.
frames_head->frame_previous = frames_tail;
// Do not bother doing colour correction, there is no correct rendering.
return pages;
}
#endif // HAVE_XCURSOR --------------------------------------------------------
#ifdef HAVE_LIBHEIF //---------------------------------------------------------
static FivIoImage *
load_libheif_image(struct heif_image_handle *handle, GError **error)
{
FivIoImage *I = NULL;
int has_alpha = heif_image_handle_has_alpha_channel(handle);
int bit_depth = heif_image_handle_get_luma_bits_per_pixel(handle);
if (bit_depth < 0) {
set_error(error, "undefined bit depth");
goto fail;
}
// Setting `convert_hdr_to_8bit` seems to be a no-op for RGBA32/64.
struct heif_decoding_options *opts = heif_decoding_options_alloc();
// TODO(p): We can get 16-bit depth, in reality most likely 10-bit.
struct heif_image *image = NULL;
struct heif_error err = heif_decode_image(handle, &image,
heif_colorspace_RGB, heif_chroma_interleaved_RGBA, opts);
if (err.code != heif_error_Ok) {
set_error(error, err.message);
goto fail_decode;
}
int w = heif_image_get_width(image, heif_channel_interleaved);
int h = heif_image_get_height(image, heif_channel_interleaved);
I = fiv_io_image_new(
has_alpha ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24, w, h);
if (!I) {
set_error(error, "image allocation failure");
goto fail_process;
}
// As of writing, the library is using 16-byte alignment, unlike Cairo.
int src_stride = 0;
const uint8_t *src = heif_image_get_plane_readonly(
image, heif_channel_interleaved, &src_stride);
for (int y = 0; y < h; y++) {
uint32_t *dstp = (uint32_t *) (I->data + I->stride * y);
const uint32_t *srcp = (const uint32_t *) (src + src_stride * y);
for (int x = 0; x < w; x++) {
uint32_t rgba = g_ntohl(srcp[x]);
*dstp++ = rgba << 24 | rgba >> 8;
}
}
// TODO(p): Test real behaviour on real transparent images.
if (has_alpha && !heif_image_handle_is_premultiplied_alpha(handle))
fiv_io_premultiply_argb32(I);
heif_item_id exif_id = 0;
if (heif_image_handle_get_list_of_metadata_block_IDs(
handle, "Exif", &exif_id, 1)) {
size_t exif_len = heif_image_handle_get_metadata_size(handle, exif_id);
void *exif = g_malloc0(exif_len);
err = heif_image_handle_get_metadata(handle, exif_id, exif);
if (err.code) {
g_warning("%s", err.message);
g_free(exif);
} else {
I->exif = g_bytes_new_take(exif, exif_len);
}
}
// https://loc.gov/preservation/digital/formats/fdd/fdd000526.shtml#factors
if (heif_image_handle_get_color_profile_type(handle) ==
heif_color_profile_type_prof) {
size_t icc_len = heif_image_handle_get_raw_color_profile_size(handle);
void *icc = g_malloc0(icc_len);
err = heif_image_handle_get_raw_color_profile(handle, icc);
if (err.code) {
g_warning("%s", err.message);
g_free(icc);
} else {
I->icc = g_bytes_new_take(icc, icc_len);
}
}
fail_process:
heif_image_release(image);
fail_decode:
heif_decoding_options_free(opts);
fail:
return I;
}
static void
load_libheif_aux_images(const FivIoOpenContext *ioctx,
struct heif_image_handle *top,
FivIoImage **result, FivIoImage **result_tail)
{
// Include the depth image, we have no special processing for it now.
int filter = LIBHEIF_AUX_IMAGE_FILTER_OMIT_ALPHA;
int n = heif_image_handle_get_number_of_auxiliary_images(top, filter);
heif_item_id *ids = g_malloc0_n(n, sizeof *ids);
n = heif_image_handle_get_list_of_auxiliary_image_IDs(top, filter, ids, n);
for (int i = 0; i < n; i++) {
struct heif_image_handle *handle = NULL;
struct heif_error err =
heif_image_handle_get_auxiliary_image_handle(top, ids[i], &handle);
if (err.code != heif_error_Ok) {
add_warning(ioctx, "%s", err.message);
continue;
}
GError *e = NULL;
if (!try_append_page(
load_libheif_image(handle, &e), result, result_tail)) {
add_warning(ioctx, "%s", e->message);
g_error_free(e);
}
heif_image_handle_release(handle);
}
g_free(ids);
}
static FivIoImage *
open_libheif(
const char *data, gsize len, const FivIoOpenContext *ioctx, GError **error)
{
// libheif will throw C++ exceptions on allocation failures.
// The library is generally awful through and through.
struct heif_context *ctx = heif_context_alloc();
FivIoImage *result = NULL, *result_tail = NULL;
struct heif_error err;
err = heif_context_read_from_memory_without_copy(ctx, data, len, NULL);
if (err.code != heif_error_Ok) {
set_error(error, err.message);
goto fail_read;
}
int n = heif_context_get_number_of_top_level_images(ctx);
heif_item_id *ids = g_malloc0_n(n, sizeof *ids);
n = heif_context_get_list_of_top_level_image_IDs(ctx, ids, n);
for (int i = 0; i < n; i++) {
struct heif_image_handle *handle = NULL;
err = heif_context_get_image_handle(ctx, ids[i], &handle);
if (err.code != heif_error_Ok) {
add_warning(ioctx, "%s", err.message);
continue;
}
GError *e = NULL;
if (!try_append_page(
load_libheif_image(handle, &e), &result, &result_tail)) {
add_warning(ioctx, "%s", e->message);
g_error_free(e);
}
// TODO(p): Possibly add thumbnail images as well.
load_libheif_aux_images(ioctx, handle, &result, &result_tail);
heif_image_handle_release(handle);
}
if (!result) {
g_clear_pointer(&result, fiv_io_image_unref);
set_error(error, "empty or unsupported image");
}
g_free(ids);
fail_read:
heif_context_free(ctx);
return fiv_io_profile_finalize(result, ioctx->screen_profile);
}
#endif // HAVE_LIBHEIF --------------------------------------------------------
#ifdef HAVE_LIBTIFF //---------------------------------------------------------
struct fiv_io_tiff {
const FivIoOpenContext *ctx;
unsigned char *data;
gchar *error;
// No, libtiff, the offset is not supposed to be unsigned (also see:
// man 0p sys_types.h), but at least it's fewer cases for us to care about.
toff_t position, len;
};
static tsize_t
fiv_io_tiff_read(thandle_t h, tdata_t buf, tsize_t len)
{
struct fiv_io_tiff *io = h;
if (len < 0) {
// What the FUCK! This argument is not supposed to be signed!
// How many mistakes can you make in such a basic API?
errno = EOWNERDEAD;
return -1;
}
if (io->position > io->len) {
errno = EOVERFLOW;
return -1;
}
toff_t n = MIN(io->len - io->position, (toff_t) len);
if (n > TIFF_TMSIZE_T_MAX) {
errno = EIO;
return -1;
}
memcpy(buf, io->data + io->position, n);
io->position += n;
return n;
}
static tsize_t
fiv_io_tiff_write(G_GNUC_UNUSED thandle_t h,
G_GNUC_UNUSED tdata_t buf, G_GNUC_UNUSED tsize_t len)
{
errno = EBADF;
return -1;
}
static toff_t
fiv_io_tiff_seek(thandle_t h, toff_t offset, int whence)
{
struct fiv_io_tiff *io = h;
switch (whence) {
case SEEK_SET:
io->position = offset;
break;
case SEEK_CUR:
io->position += offset;
break;
case SEEK_END:
io->position = io->len + offset;
break;
default:
errno = EINVAL;
return -1;
}
return io->position;
}
static int
fiv_io_tiff_close(G_GNUC_UNUSED thandle_t h)
{
return 0;
}
static toff_t
fiv_io_tiff_size(thandle_t h)
{
return ((struct fiv_io_tiff *) h)->len;
}
static void
fiv_io_tiff_error(
thandle_t h, const char *module, const char *format, va_list ap)
{
struct fiv_io_tiff *io = h;
gchar *message = g_strdup_vprintf(format, ap);
if (io->error)
// I'm not sure if two errors can ever come in a succession,
// but make sure to log them in any case.
add_warning(io->ctx, "%s: %s", module, message);
else
io->error = g_strconcat(module, ": ", message, NULL);
g_free(message);
}
static void
fiv_io_tiff_warning(G_GNUC_UNUSED thandle_t h,
const char *module, const char *format, va_list ap)
{
gchar *message = g_strdup_vprintf(format, ap);
g_debug("tiff: %s: %s", module, message);
g_free(message);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static FivIoImage *
load_libtiff_directory(TIFF *tiff, GError **error)
{
char emsg[1024] = "";
if (!TIFFRGBAImageOK(tiff, emsg)) {
set_error(error, emsg);
return NULL;
}
// TODO(p): Are there cases where we might not want to "stop on error"?
TIFFRGBAImage image;
if (!TIFFRGBAImageBegin(&image, tiff, 1 /* stop on error */, emsg)) {
set_error(error, emsg);
return NULL;
}
FivIoImage *I = NULL;
if (image.width > G_MAXINT || image.height >= G_MAXINT ||
G_MAXUINT32 / image.width < image.height) {
set_error(error, "image dimensions too large");
goto fail;
}
I = fiv_io_image_new(image.alpha != EXTRASAMPLE_UNSPECIFIED
? CAIRO_FORMAT_ARGB32
: CAIRO_FORMAT_RGB24,
image.width, image.height);
if (!I) {
set_error(error, "image allocation failure");
goto fail;
}
image.req_orientation = ORIENTATION_LEFTTOP;
uint32_t *raster = (uint32_t *) I->data;
if (!TIFFRGBAImageGet(&image, raster, image.width, image.height)) {
g_clear_pointer(&I, fiv_io_image_unref);
goto fail;
}
// Needs to be byte-swapped from ABGR to alpha-premultiplied ARGB for Cairo.
for (uint64_t i = image.width * image.height; i--; ) {
uint32_t pixel = raster[i];
raster[i] = TIFFGetA(pixel) << 24 | TIFFGetR(pixel) << 16 |
TIFFGetG(pixel) << 8 | TIFFGetB(pixel);
}
// It seems that neither GIMP nor Photoshop use unassociated alpha.
if (image.alpha == EXTRASAMPLE_UNASSALPHA)
fiv_io_premultiply_argb32(I);
// XXX: The whole file is essentially an Exif, any ideas?
// TODO(p): TIFF has a number of fields that an ICC profile can be
// constructed from--it's not a good idea to blindly default to sRGB
// if we don't find an ICC profile.
const uint32_t meta_len = 0;
const void *meta = NULL;
if (TIFFGetField(tiff, TIFFTAG_ICCPROFILE, &meta_len, &meta))
I->icc = g_bytes_new(meta, meta_len);
if (TIFFGetField(tiff, TIFFTAG_XMLPACKET, &meta_len, &meta))
I->xmp = g_bytes_new(meta, meta_len);
// Don't ask. The API is high, alright, I'm just not sure about the level.
uint16_t orientation = 0;
if (TIFFGetField(tiff, TIFFTAG_ORIENTATION, &orientation)) {
if (orientation == 5 || orientation == 7)
I->orientation = 5;
if (orientation == 6 || orientation == 8)
I->orientation = 7;
}
fail:
TIFFRGBAImageEnd(&image);
// TODO(p): It's possible to implement ClipPath easily with Cairo.
return I;
}
static FivIoImage *
open_libtiff(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
// Both kinds of handlers are called, redirect everything.
TIFFErrorHandler eh = TIFFSetErrorHandler(NULL);
TIFFErrorHandler wh = TIFFSetWarningHandler(NULL);
TIFFErrorHandlerExt ehe = TIFFSetErrorHandlerExt(fiv_io_tiff_error);
TIFFErrorHandlerExt whe = TIFFSetWarningHandlerExt(fiv_io_tiff_warning);
struct fiv_io_tiff h = {
.ctx = ctx,
.data = (unsigned char *) data,
.position = 0,
.len = len,
};
FivIoImage *result = NULL, *result_tail = NULL;
TIFF *tiff = TIFFClientOpen(ctx->uri, "rm" /* Avoid mmap. */, &h,
fiv_io_tiff_read, fiv_io_tiff_write, fiv_io_tiff_seek,
fiv_io_tiff_close, fiv_io_tiff_size, NULL, NULL);
if (!tiff)
goto fail;
do {
// We inform about unsupported directories, but do not fail on them.
GError *err = NULL;
if (!try_append_page(
load_libtiff_directory(tiff, &err), &result, &result_tail) &&
err) {
add_warning(ctx, "%s", err->message);
g_error_free(err);
}
} while (TIFFReadDirectory(tiff));
TIFFClose(tiff);
fail:
if (h.error) {
g_clear_pointer(&result, fiv_io_image_unref);
set_error(error, h.error);
g_free(h.error);
} else if (!result) {
set_error(error, "empty or unsupported image");
}
TIFFSetErrorHandlerExt(ehe);
TIFFSetWarningHandlerExt(whe);
TIFFSetErrorHandler(eh);
TIFFSetWarningHandler(wh);
return fiv_io_profile_finalize(result, ctx->screen_profile);
}
#endif // HAVE_LIBTIFF --------------------------------------------------------
#ifdef HAVE_GDKPIXBUF // ------------------------------------------------------
static FivIoImage *
load_gdkpixbuf_argb32_unpremultiplied(GdkPixbuf *pixbuf)
{
int w = gdk_pixbuf_get_width(pixbuf);
int h = gdk_pixbuf_get_height(pixbuf);
FivIoImage *image = fiv_io_image_new(CAIRO_FORMAT_ARGB32, w, h);
if (!image)
return NULL;
guint length = 0;
guchar *src = gdk_pixbuf_get_pixels_with_length(pixbuf, &length);
int src_stride = gdk_pixbuf_get_rowstride(pixbuf);
uint32_t *dst = (uint32_t *) image->data;
for (int y = 0; y < h; y++) {
const guchar *p = src + y * src_stride;
for (int x = 0; x < w; x++) {
*dst++ = (uint32_t) p[3] << 24 | p[0] << 16 | p[1] << 8 | p[2];
p += 4;
}
}
return image;
}
static FivIoImage *
open_gdkpixbuf(
const char *data, gsize len, const FivIoOpenContext *ctx, GError **error)
{
// gdk-pixbuf controls the playback itself, there is no reliable method of
// extracting individual frames (due to loops).
GInputStream *is = g_memory_input_stream_new_from_data(data, len, NULL);
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_stream(is, NULL, error);
g_object_unref(is);
if (!pixbuf)
return NULL;
bool custom_argb32 = ctx->screen_profile &&
gdk_pixbuf_get_has_alpha(pixbuf) &&
gdk_pixbuf_get_colorspace(pixbuf) == GDK_COLORSPACE_RGB &&
gdk_pixbuf_get_n_channels(pixbuf) == 4 &&
gdk_pixbuf_get_bits_per_sample(pixbuf) == 8;
FivIoImage *image = NULL;
if (custom_argb32) {
image = load_gdkpixbuf_argb32_unpremultiplied(pixbuf);
} else if ((image = fiv_io_image_new(CAIRO_FORMAT_ARGB32,
gdk_pixbuf_get_width(pixbuf), gdk_pixbuf_get_height(pixbuf)))) {
// TODO(p): Ideally, don't go through Cairo at all.
cairo_surface_t *surface = fiv_io_image_to_surface_noref(image);
cairo_t *cr = cairo_create(surface);
cairo_surface_destroy(surface);
// Don't depend on GDK being initialized, to speed up thumbnailing
// (calling gdk_cairo_surface_create_from_pixbuf() would).
gdk_cairo_set_source_pixbuf(cr, pixbuf, 0, 0);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
// If the source was opaque, so will be the destination.
if (cairo_pattern_get_surface(cairo_get_source(cr), &surface) ==
CAIRO_STATUS_SUCCESS) {
if (cairo_surface_get_content(surface) == CAIRO_CONTENT_COLOR)
image->format = CAIRO_FORMAT_RGB24;
}
cairo_destroy(cr);
}
if (!image) {
set_error(error, "image allocation failure");
g_object_unref(pixbuf);
return NULL;
}
const char *orientation = gdk_pixbuf_get_option(pixbuf, "orientation");
if (orientation && strlen(orientation) == 1) {
int n = *orientation - '0';
if (n >= 1 && n <= 8)
image->orientation = n;
}
const char *icc_profile = gdk_pixbuf_get_option(pixbuf, "icc-profile");
if (icc_profile) {
gsize out_len = 0;
guchar *raw = g_base64_decode(icc_profile, &out_len);
if (raw)
image->icc = g_bytes_new_take(raw, out_len);
}
g_object_unref(pixbuf);
if (custom_argb32)
fiv_io_profile_argb32_premultiply_page(image, ctx->screen_profile);
else
image = fiv_io_profile_finalize(image, ctx->screen_profile);
return image;
}
#endif // HAVE_GDKPIXBUF ------------------------------------------------------
FivIoImage *
fiv_io_open(const FivIoOpenContext *ctx, GError **error)
{
// TODO(p): Don't always load everything into memory, test type first,
// so that we can reject non-pictures early. Wuffs only needs the first
// 17 bytes to make a guess right now.
//
// LibRaw poses an issue--there is no good registry for identification
// of supported files. Many of them are compliant TIFF files.
// The only good filtering method for RAWs are currently file extensions
// extracted from shared-mime-info.
//
// SVG is also problematic, an unbounded search for its root element.
// But problematic files can be assumed to be crafted.
//
// gdk-pixbuf exposes its detection data through gdk_pixbuf_get_formats().
// This may also be unbounded, as per format_check().
GFile *file = g_file_new_for_uri(ctx->uri);
gchar *data = NULL;
gsize len = 0;
gboolean success =
g_file_load_contents(file, NULL, &data, &len, NULL, error);
g_object_unref(file);
if (!success)
return NULL;
FivIoImage *image = fiv_io_open_from_data(data, len, ctx, error);
g_free(data);
return image;
}
FivIoImage *
fiv_io_open_from_data(
const char *data, size_t len, const FivIoOpenContext *ctx, GError **error)
{
wuffs_base__slice_u8 prefix =
wuffs_base__make_slice_u8((uint8_t *) data, len);
FivIoImage *image = NULL;
switch (wuffs_base__magic_number_guess_fourcc(prefix, true /* closed */)) {
case WUFFS_BASE__FOURCC__BMP:
// Note that BMP can redirect into another format,
// which is so far unsupported here.
image = open_wuffs_using(
wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder, data, len,
ctx, error);
break;
case WUFFS_BASE__FOURCC__GIF:
image = open_wuffs_using(
wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder, data, len,
ctx, error);
break;
case WUFFS_BASE__FOURCC__PNG:
image = open_wuffs_using(
wuffs_png__decoder__alloc_as__wuffs_base__image_decoder, data, len,
ctx, error);
break;
case WUFFS_BASE__FOURCC__TGA:
image = open_wuffs_using(
wuffs_tga__decoder__alloc_as__wuffs_base__image_decoder, data, len,
ctx, error);
break;
case WUFFS_BASE__FOURCC__JPEG:
image = open_libjpeg_turbo(data, len, ctx, error);
break;
case WUFFS_BASE__FOURCC__WEBP:
image = open_libwebp(data, len, ctx, error);
break;
default:
// Try to extract full-size previews from TIFF/EP-compatible raws,
// but allow for running the full render.
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
if (!ctx->enhance) {
#endif // HAVE_LIBRAW ---------------------------------------------------------
if ((image = open_tiff_ep(data, len, ctx, error)))
break;
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
}
if ((image = open_libraw(data, len, ctx, error)))
break;
// TODO(p): We should try to pass actual processing errors through,
// notably only continue with LIBRAW_FILE_UNSUPPORTED.
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#endif // HAVE_LIBRAW ---------------------------------------------------------
#ifdef HAVE_RESVG // ----------------------------------------------------------
if ((image = open_resvg(data, len, ctx, error)))
break;
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#endif // HAVE_RESVG ----------------------------------------------------------
#ifdef HAVE_LIBRSVG // --------------------------------------------------------
if ((image = open_librsvg(data, len, ctx, error)))
break;
// XXX: It doesn't look like librsvg can return sensible errors.
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#endif // HAVE_LIBRSVG --------------------------------------------------------
#ifdef HAVE_XCURSOR //---------------------------------------------------------
if ((image = open_xcursor(data, len, ctx, error)))
break;
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#endif // HAVE_XCURSOR --------------------------------------------------------
#ifdef HAVE_LIBHEIF //---------------------------------------------------------
if ((image = open_libheif(data, len, ctx, error)))
break;
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#endif // HAVE_LIBHEIF --------------------------------------------------------
#ifdef HAVE_LIBTIFF //---------------------------------------------------------
// This needs to be positioned after LibRaw.
if ((image = open_libtiff(data, len, ctx, error)))
break;
if (error) {
g_debug("%s", (*error)->message);
g_clear_error(error);
}
#endif // HAVE_LIBTIFF --------------------------------------------------------
set_error(error, "unsupported file type");
}
#ifdef HAVE_GDKPIXBUF // ------------------------------------------------------
// This is used as a last resort, the rest above is special-cased.
if (!image) {
GError *err = NULL;
if ((image = open_gdkpixbuf(data, len, ctx, &err))) {
g_clear_error(error);
} else if (!err) {
// Contrary to documentation, this is a possible outcome (libheif).
} else if (err->code == GDK_PIXBUF_ERROR_UNKNOWN_TYPE) {
g_error_free(err);
} else {
g_clear_error(error);
g_propagate_error(error, err);
}
}
#endif // HAVE_GDKPIXBUF ------------------------------------------------------
// gdk-pixbuf only gives out this single field--cater to its limitations,
// since we'd really like to have it.
// TODO(p): The Exif orientation should be ignored in JPEG-XL at minimum.
gsize exif_len = 0;
gconstpointer exif_data = NULL;
if (image && image->exif &&
(exif_data = g_bytes_get_data(image->exif, &exif_len))) {
image->orientation = fiv_io_exif_orientation(exif_data, exif_len);
}
return image;
}
// --- Thumbnail passing utilities ---------------------------------------------
typedef struct {
guint64 user_data;
int width, height, stride, format;
} CairoHeader;
void
fiv_io_serialize_to_stdout(cairo_surface_t *surface, guint64 user_data)
{
if (!surface || cairo_surface_get_type(surface) != CAIRO_SURFACE_TYPE_IMAGE)
return;
#ifdef G_OS_UNIX
// Common courtesy, this is never what the user wants.
if (isatty(fileno(stdout)))
return;
#endif
CairoHeader h = {
.user_data = user_data,
.width = cairo_image_surface_get_width(surface),
.height = cairo_image_surface_get_height(surface),
.stride = cairo_image_surface_get_stride(surface),
.format = cairo_image_surface_get_format(surface),
};
// Cairo lets pixman initialize image surfaces.
// pixman allocates stride * height, not omitting those trailing bytes.
const unsigned char *data = cairo_image_surface_get_data(surface);
if (fwrite(&h, sizeof h, 1, stdout) == 1)
fwrite(data, 1, h.stride * h.height, stdout);
}
cairo_surface_t *
fiv_io_deserialize(GBytes *bytes, guint64 *user_data)
{
CairoHeader h = {};
GByteArray *array = g_bytes_unref_to_array(bytes);
if (array->len < sizeof h) {
g_byte_array_unref(array);
return NULL;
}
h = *(CairoHeader *) array->data;
if (h.width < 1 || h.height < 1 || h.stride < h.width ||
G_MAXSIZE / (gsize) h.stride < (gsize) h.height ||
array->len - sizeof h < (gsize) h.stride * (gsize) h.height) {
g_byte_array_unref(array);
return NULL;
}
cairo_surface_t *surface = cairo_image_surface_create_for_data(
array->data + sizeof h, h.format, h.width, h.height, h.stride);
if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy(surface);
g_byte_array_unref(array);
return NULL;
}
static cairo_user_data_key_t key;
cairo_surface_set_user_data(
surface, &key, array, (cairo_destroy_func_t) g_byte_array_unref);
*user_data = h.user_data;
return surface;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static cairo_status_t
write_to_byte_array(
void *closure, const unsigned char *data, unsigned int length)
{
g_byte_array_append(closure, data, length);
return CAIRO_STATUS_SUCCESS;
}
GBytes *
fiv_io_serialize_for_search(cairo_surface_t *surface, GError **error)
{
g_return_val_if_fail(
surface && cairo_surface_get_type(surface) == CAIRO_SURFACE_TYPE_IMAGE,
NULL);
cairo_format_t format = cairo_image_surface_get_format(surface);
if (format == CAIRO_FORMAT_ARGB32) {
const uint32_t *data =
(const uint32_t *) cairo_image_surface_get_data(surface);
bool all_solid = true;
for (size_t len = cairo_image_surface_get_width(surface) *
cairo_image_surface_get_height(surface); len--; ) {
if ((data[len] >> 24) != 0xFF)
all_solid = false;
}
if (all_solid)
format = CAIRO_FORMAT_RGB24;
}
if (format != CAIRO_FORMAT_RGB24) {
#if CAIRO_HAS_PNG_FUNCTIONS
GByteArray *ba = g_byte_array_new();
cairo_status_t status =
cairo_surface_write_to_png_stream(surface, write_to_byte_array, ba);
if (status == CAIRO_STATUS_SUCCESS)
return g_byte_array_free_to_bytes(ba);
g_byte_array_unref(ba);
#endif
// Last resort: remove transparency by painting over black.
cairo_surface_t *converted =
cairo_image_surface_create(CAIRO_FORMAT_RGB24,
cairo_image_surface_get_width(surface),
cairo_image_surface_get_height(surface));
cairo_t *cr = cairo_create(converted);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_paint(cr);
cairo_destroy(cr);
GBytes *result = fiv_io_serialize_for_search(converted, error);
cairo_surface_destroy(converted);
return result;
}
tjhandle enc = tjInitCompress();
if (!enc) {
set_error(error, tjGetErrorStr2(enc));
return NULL;
}
unsigned char *jpeg = NULL;
unsigned long length = 0;
if (tjCompress2(enc, cairo_image_surface_get_data(surface),
cairo_image_surface_get_width(surface),
cairo_image_surface_get_stride(surface),
cairo_image_surface_get_height(surface),
(G_BYTE_ORDER == G_LITTLE_ENDIAN ? TJPF_BGRX : TJPF_XRGB),
&jpeg, &length, TJSAMP_444, 90, 0)) {
set_error(error, tjGetErrorStr2(enc));
tjFree(jpeg);
tjDestroy(enc);
return NULL;
}
tjDestroy(enc);
return g_bytes_new_with_free_func(
jpeg, length, (GDestroyNotify) tjFree, jpeg);
}
// --- Export ------------------------------------------------------------------
unsigned char *
fiv_io_encode_webp(
FivIoImage *image, const WebPConfig *config, size_t *len)
{
if (image->format != CAIRO_FORMAT_ARGB32 &&
image->format != CAIRO_FORMAT_RGB24) {
FivIoImage *converted =
fiv_io_image_new(CAIRO_FORMAT_ARGB32, image->width, image->height);
cairo_surface_t *surface = fiv_io_image_to_surface_noref(converted);
cairo_t *cr = cairo_create(surface);
cairo_surface_destroy(surface);
surface = fiv_io_image_to_surface_noref(image);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_surface_destroy(surface);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_destroy(cr);
image = converted;
} else {
image = fiv_io_image_ref(image);
}
WebPMemoryWriter writer = {};
WebPMemoryWriterInit(&writer);
WebPPicture picture = {};
if (!WebPPictureInit(&picture))
goto fail;
picture.use_argb = true;
picture.width = image->width;
picture.height = image->height;
if (!WebPPictureAlloc(&picture))
goto fail;
// Cairo uses a similar internal format, so we should be able to
// copy it over and fix up the minor differences.
// This is written to be easy to follow rather than fast.
if (picture.argb_stride != (int) image->width ||
picture.argb_stride * sizeof *picture.argb != image->stride ||
UINT32_MAX / picture.argb_stride < image->height)
goto fail_compatibility;
uint32_t *argb =
memcpy(picture.argb, image->data, image->stride * image->height);
if (image->format == CAIRO_FORMAT_ARGB32)
for (int i = image->height * picture.argb_stride; i-- > 0; argb++)
*argb = wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(*argb);
else
for (int i = image->height * picture.argb_stride; i-- > 0; argb++)
*argb |= 0xFF000000;
// TODO(p): Prevent or propagate VP8_ENC_ERROR_BAD_DIMENSION.
picture.writer = WebPMemoryWrite;
picture.custom_ptr = &writer;
if (!WebPEncode(config, &picture))
g_debug("WebPEncode: %d\n", picture.error_code);
fail_compatibility:
WebPPictureFree(&picture);
fail:
fiv_io_image_unref(image);
*len = writer.size;
return writer.mem;
}
static WebPData
encode_lossless_webp(FivIoImage *image)
{
WebPData bitstream = {};
WebPConfig config = {};
if (!WebPConfigInit(&config) || !WebPConfigLosslessPreset(&config, 6))
return bitstream;
config.thread_level = true;
if (!WebPValidateConfig(&config))
return bitstream;
bitstream.bytes = fiv_io_encode_webp(image, &config, &bitstream.size);
return bitstream;
}
static gboolean
encode_webp_image(WebPMux *mux, FivIoImage *frame)
{
WebPData bitstream = encode_lossless_webp(frame);
gboolean ok = WebPMuxSetImage(mux, &bitstream, true) == WEBP_MUX_OK;
WebPDataClear(&bitstream);
return ok;
}
static gboolean
encode_webp_animation(WebPMux *mux, FivIoImage *page)
{
gboolean ok = TRUE;
for (FivIoImage *frame = page; ok && frame; frame = frame->frame_next) {
WebPMuxFrameInfo info = {
.bitstream = encode_lossless_webp(frame),
.duration = frame->frame_duration,
.id = WEBP_CHUNK_ANMF,
.dispose_method = WEBP_MUX_DISPOSE_NONE,
.blend_method = WEBP_MUX_NO_BLEND,
};
ok = WebPMuxPushFrame(mux, &info, true) == WEBP_MUX_OK;
WebPDataClear(&info.bitstream);
}
WebPMuxAnimParams params = {
.bgcolor = 0x00000000, // BGRA, curiously.
.loop_count = page->loops,
};
return ok && WebPMuxSetAnimationParams(mux, &params) == WEBP_MUX_OK;
}
static gboolean
set_metadata(WebPMux *mux, const char *fourcc, GBytes *data)
{
if (!data)
return TRUE;
gsize len = 0;
gconstpointer p = g_bytes_get_data(data, &len);
return WebPMuxSetChunk(mux, fourcc, &(WebPData) {.bytes = p, .size = len},
false) == WEBP_MUX_OK;
}
gboolean
fiv_io_save(FivIoImage *page, FivIoImage *frame, FivIoProfile target,
const char *path, GError **error)
{
g_return_val_if_fail(page != NULL, FALSE);
g_return_val_if_fail(path != NULL, FALSE);
gboolean ok = TRUE;
WebPMux *mux = WebPMuxNew();
if (frame)
ok = encode_webp_image(mux, frame);
else if (!page->frame_next)
ok = encode_webp_image(mux, page);
else
ok = encode_webp_animation(mux, page);
ok = ok && set_metadata(mux, "EXIF", page->exif);
ok = ok && set_metadata(mux, "ICCP", page->icc);
ok = ok && set_metadata(mux, "XMP ", page->xmp);
GBytes *iccp = NULL;
if (ok && target && (iccp = fiv_io_profile_to_bytes(target)))
ok = set_metadata(mux, "ICCP", iccp);
WebPData assembled = {};
WebPDataInit(&assembled);
if (!(ok = ok && WebPMuxAssemble(mux, &assembled) == WEBP_MUX_OK))
set_error(error, "encoding failed");
else
ok = g_file_set_contents(
path, (const gchar *) assembled.bytes, assembled.size, error);
if (iccp)
g_bytes_unref(iccp);
WebPMuxDelete(mux);
WebPDataClear(&assembled);
return ok;
}
// --- Metadata ----------------------------------------------------------------
void
fiv_io_orientation_dimensions(
const FivIoImage *image, FivIoOrientation orientation, double *w, double *h)
{
switch (orientation) {
case FivIoOrientation90:
case FivIoOrientationMirror90:
case FivIoOrientation270:
case FivIoOrientationMirror270:
*w = image->height;
*h = image->width;
break;
default:
*w = image->width;
*h = image->height;
}
}
cairo_matrix_t
fiv_io_orientation_apply(const FivIoImage *image,
FivIoOrientation orientation, double *width, double *height)
{
fiv_io_orientation_dimensions(image, orientation, width, height);
cairo_matrix_t matrix = {};
cairo_matrix_init_identity(&matrix);
switch (orientation) {
case FivIoOrientation90:
cairo_matrix_rotate(&matrix, -M_PI_2);
cairo_matrix_translate(&matrix, -*width, 0);
break;
case FivIoOrientation180:
cairo_matrix_scale(&matrix, -1, -1);
cairo_matrix_translate(&matrix, -*width, -*height);
break;
case FivIoOrientation270:
cairo_matrix_rotate(&matrix, +M_PI_2);
cairo_matrix_translate(&matrix, 0, -*height);
break;
case FivIoOrientationMirror0:
cairo_matrix_scale(&matrix, -1, +1);
cairo_matrix_translate(&matrix, -*width, 0);
break;
case FivIoOrientationMirror90:
cairo_matrix_rotate(&matrix, +M_PI_2);
cairo_matrix_scale(&matrix, -1, +1);
cairo_matrix_translate(&matrix, -*width, -*height);
break;
case FivIoOrientationMirror180:
cairo_matrix_scale(&matrix, +1, -1);
cairo_matrix_translate(&matrix, 0, -*height);
break;
case FivIoOrientationMirror270:
cairo_matrix_rotate(&matrix, -M_PI_2);
cairo_matrix_scale(&matrix, -1, +1);
default:
break;
}
return matrix;
}
FivIoOrientation
fiv_io_exif_orientation(const guint8 *tiff, gsize len)
{
// The "Orientation" tag/field is part of Baseline TIFF 6.0 (1992),
// it just so happens that Exif is derived from this format.
// There is no other meaningful placement for this than right in IFD0,
// describing the main image.
struct tiffer T = {};
if (!tiffer_init(&T, tiff, len) || !tiffer_next_ifd(&T))
return FivIoOrientationUnknown;
struct tiffer_entry entry = {};
while (tiffer_next_entry(&T, &entry)) {
int64_t orientation = 0;
if (G_UNLIKELY(entry.tag == TIFF_Orientation) &&
entry.type == TIFFER_SHORT && entry.remaining_count == 1 &&
tiffer_integer(&T, &entry, &orientation) &&
orientation >= 1 && orientation <= 8)
return orientation;
}
return FivIoOrientationUnknown;
}
gboolean
fiv_io_save_metadata(const FivIoImage *page, const char *path, GError **error)
{
g_return_val_if_fail(page != NULL, FALSE);
FILE *fp = fopen(path, "wb");
if (!fp) {
g_set_error(error, G_IO_ERROR, g_io_error_from_errno(errno),
"%s: %s", path, g_strerror(errno));
return FALSE;
}
// This does not constitute a valid JPEG codestream--it's a TEM marker
// (standalone) with trailing nonsense.
fprintf(fp, "\xFF\001Exiv2");
gsize len = 0;
gconstpointer p = NULL;
// Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3
// I don't care if Exiv2 supports it this way.
if (page->exif && (p = g_bytes_get_data(page->exif, &len))) {
while (len) {
gsize chunk = MIN(len, 0xFFFF - 2 - 6);
uint8_t header[10] = "\xFF\xE1\000\000Exif\000\000";
header[2] = (chunk + 2 + 6) >> 8;
header[3] = (chunk + 2 + 6);
fwrite(header, 1, sizeof header, fp);
fwrite(p, 1, chunk, fp);
len -= chunk;
p += chunk;
}
}
// https://www.color.org/specification/ICC1v43_2010-12.pdf B.4
if (page->icc && (p = g_bytes_get_data(page->icc, &len))) {
gsize limit = 0xFFFF - 2 - 12;
uint8_t current = 0, total = (len + limit - 1) / limit;
while (len) {
gsize chunk = MIN(len, limit);
uint8_t header[18] = "\xFF\xE2\000\000ICC_PROFILE\000\000\000";
header[2] = (chunk + 2 + 12 + 2) >> 8;
header[3] = (chunk + 2 + 12 + 2);
header[16] = ++current;
header[17] = total;
fwrite(header, 1, sizeof header, fp);
fwrite(p, 1, chunk, fp);
len -= chunk;
p += chunk;
}
}
// Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3
// If the main segment overflows, then it's a sign of bad luck,
// because 1.1.3.1 is way too complex.
if (page->xmp && (p = g_bytes_get_data(page->xmp, &len))) {
while (len) {
gsize chunk = MIN(len, 0xFFFF - 2 - 29);
uint8_t header[33] =
"\xFF\xE1\000\000http://ns.adobe.com/xap/1.0/\000";
header[2] = (chunk + 2 + 29) >> 8;
header[3] = (chunk + 2 + 29);
fwrite(header, 1, sizeof header, fp);
fwrite(p, 1, chunk, fp);
break;
}
}
fprintf(fp, "\xFF\xD9");
if (ferror(fp)) {
g_set_error(error, G_IO_ERROR, g_io_error_from_errno(errno),
"%s: %s", path, g_strerror(errno));
fclose(fp);
return FALSE;
}
if (fclose(fp)) {
g_set_error(error, G_IO_ERROR, g_io_error_from_errno(errno),
"%s: %s", path, g_strerror(errno));
return FALSE;
}
return TRUE;
}
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