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Split out image loaders into fastiv-io.c

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Přemysl Eric Janouch
2021-09-20 00:30:20 +02:00
parent c8d408b428
commit e4d1e50c4a
4 changed files with 432 additions and 402 deletions
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fastiv-io.c Normal file
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@@ -0,0 +1,426 @@
//
// fastiv-io.c: image loaders
//
// Copyright (c) 2021, 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 <glib.h>
#include <cairo.h>
#include <turbojpeg.h>
#ifdef HAVE_LIBRAW
#include <libraw.h>
#endif // HAVE_LIBRAW
#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__ZLIB
#include "wuffs-mirror-release-c/release/c/wuffs-v0.3.c"
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define FASTIV_IO_ERROR fastiv_io_error_quark()
G_DEFINE_QUARK(fastiv-io-error-quark, fastiv_io_error)
enum FastivIoError {
FASTIV_IO_ERROR_OPEN,
};
static void
set_error(GError **error, const char *message)
{
g_set_error_literal(error,
FASTIV_IO_ERROR, FASTIV_IO_ERROR_OPEN, message);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// 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 cairo_surface_t *
open_wuffs(wuffs_base__image_decoder *dec,
wuffs_base__io_buffer src, GError **error)
{
wuffs_base__image_config cfg;
wuffs_base__status status =
wuffs_base__image_decoder__decode_image_config(dec, &cfg, &src);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
return NULL;
}
if (!wuffs_base__image_config__is_valid(&cfg)) {
set_error(error, "invalid Wuffs image configuration");
return NULL;
}
// We need to check because of the Cairo API.
uint32_t width = wuffs_base__pixel_config__width(&cfg.pixcfg);
uint32_t height = wuffs_base__pixel_config__height(&cfg.pixcfg);
if (width > INT_MAX || height > INT_MAX) {
set_error(error, "image dimensions overflow");
return NULL;
}
// CAIRO_FORMAT_ARGB32: "The 32-bit quantities are stored native-endian.
// Pre-multiplied alpha is used."
// CAIRO_FORMAT_RGB{24,30}: analogous, not going to use these so far.
//
// Wuffs: /doc/note/pixel-formats.md specifies it as "memory order", which,
// for our purposes, means big endian. Currently useful formats, as per
// support within wuffs_base__pixel_swizzler__prepare__*():
// - WUFFS_BASE__PIXEL_FORMAT__ARGB_PREMUL: big-endian
// - WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL: little-endian
// - WUFFS_BASE__PIXEL_FORMAT__XRGB: big-endian
// - WUFFS_BASE__PIXEL_FORMAT__BGRX: little-endian
//
// TODO(p): Make Wuffs support RGB30 as a destination format,
// so far we only have WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE
// and in general, 16-bit depth swizzlers are stubbed.
wuffs_base__pixel_config__set(&cfg.pixcfg,
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL,
#else
WUFFS_BASE__PIXEL_FORMAT__ARGB_PREMUL,
#endif
WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, width, height);
wuffs_base__slice_u8 workbuf = {0};
uint64_t workbuf_len_max_incl =
wuffs_base__image_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");
return NULL;
}
}
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(surface_status));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
// CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be 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};
status = wuffs_base__pixel_buffer__set_from_slice(&pb, &cfg.pixcfg,
wuffs_base__make_slice_u8(cairo_image_surface_get_data(surface),
cairo_image_surface_get_stride(surface) *
cairo_image_surface_get_height(surface)));
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
#if 0 // We're not using this right now.
wuffs_base__frame_config fc = {0};
status = wuffs_png__decoder__decode_frame_config(&dec, &fc, &src);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
#endif
// Starting to modify pixel data directly. Probably an unnecessary call.
cairo_surface_flush(surface);
status = wuffs_base__image_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));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
// Pixel data has been written, need to let Cairo know.
cairo_surface_mark_dirty(surface);
free(workbuf.ptr);
return surface;
}
static cairo_surface_t *
open_wuffs_using(wuffs_base__image_decoder *(*allocate)(),
const gchar *data, gsize len, GError **error)
{
wuffs_base__image_decoder *dec = allocate();
if (!dec) {
set_error(error, "memory allocation failed or internal error");
return NULL;
}
cairo_surface_t *surface = open_wuffs(dec,
wuffs_base__ptr_u8__reader((uint8_t *) data, len, TRUE), error);
free(dec);
return surface;
}
static void
trivial_cmyk_to_bgra(unsigned char *p, int len)
{
// Inspired by gdk-pixbuf's io-jpeg.c:
//
// 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];
p[0] = k * y / 255;
p[1] = k * m / 255;
p[2] = k * c / 255;
p[3] = 255;
p += 4;
}
}
static cairo_surface_t *
open_libjpeg_turbo(const gchar *data, gsize len, GError **error)
{
tjhandle dec = tjInitDecompress();
if (!dec) {
set_error(error, tjGetErrorStr2(dec));
return NULL;
}
int width = 0, height = 0, subsampling = TJSAMP_444, colorspace = TJCS_RGB;
if (tjDecompressHeader3(dec, (const unsigned char *) data, len,
&width, &height, &subsampling, &colorspace)) {
set_error(error, tjGetErrorStr2(dec));
tjDestroy(dec);
return NULL;
}
int pixel_format = (colorspace == TJCS_CMYK || colorspace == TJCS_YCCK)
? TJPF_CMYK
: (G_BYTE_ORDER == G_LITTLE_ENDIAN ? TJPF_BGRA : TJPF_ARGB);
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(surface_status));
cairo_surface_destroy(surface);
tjDestroy(dec);
return NULL;
}
// Starting to modify pixel data directly. Probably an unnecessary call.
cairo_surface_flush(surface);
int stride = cairo_image_surface_get_stride(surface);
if (tjDecompress2(dec, (const unsigned char *) data, len,
cairo_image_surface_get_data(surface), width, stride,
height, pixel_format, TJFLAG_ACCURATEDCT)) {
set_error(error, tjGetErrorStr2(dec));
cairo_surface_destroy(surface);
tjDestroy(dec);
return NULL;
}
// TODO(p): Support big-endian machines, too, those need ARGB ordering.
if (pixel_format == TJPF_CMYK) {
// CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be no padding with
// ARGB/BGR/XRGB/BGRX.
trivial_cmyk_to_bgra(cairo_image_surface_get_data(surface),
width * height);
}
// Pixel data has been written, need to let Cairo know.
cairo_surface_mark_dirty(surface);
tjDestroy(dec);
return surface;
}
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
static cairo_surface_t *
open_libraw(const gchar *data, gsize len, 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;
}
#if 0
// TODO(p): Consider setting this--the image is still likely to be
// rendered suboptimally, so why not make it faster.
iprc->params.half_size = 1;
#endif
// 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;
if ((err = libraw_open_buffer(iprc, (void *) data, len))) {
set_error(error, libraw_strerror(err));
libraw_close(iprc);
return NULL;
}
// TODO(p): Do we need to check iprc->idata.raw_count? Maybe for TIFFs?
if ((err = libraw_unpack(iprc))) {
set_error(error, libraw_strerror(err));
libraw_close(iprc);
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));
libraw_close(iprc);
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));
libraw_close(iprc);
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));
libraw_close(iprc);
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);
libraw_close(iprc);
return NULL;
}
int width = image->width, height = image->height;
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(surface_status));
cairo_surface_destroy(surface);
libraw_dcraw_clear_mem(image);
libraw_close(iprc);
return NULL;
}
// Starting to modify pixel data directly. Probably an unnecessary call.
cairo_surface_flush(surface);
uint32_t *pixels = (uint32_t *) cairo_image_surface_get_data(surface);
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;
}
}
// Pixel data has been written, need to let Cairo know.
cairo_surface_mark_dirty(surface);
libraw_dcraw_clear_mem(image);
libraw_close(iprc);
return surface;
}
#endif // HAVE_LIBRAW ---------------------------------------------------------
cairo_surface_t *
fastiv_io_open(const gchar *path, GError **error)
{
// TODO(p): Don't always load everything into memory, test type first,
// for which we only need the first 16 bytes right now.
// Though LibRaw poses an issue--we may want to try to map RAW formats
// to FourCC values--many of them are compliant TIFF files.
// We might want to employ a more generic way of magic identification,
// and with some luck, it could even be integrated into Wuffs.
gchar *data = NULL;
gsize len = 0;
if (!g_file_get_contents(path, &data, &len, error))
return NULL;
wuffs_base__slice_u8 prefix =
wuffs_base__make_slice_u8((uint8_t *) data, len);
cairo_surface_t *surface = NULL;
switch (wuffs_base__magic_number_guess_fourcc(prefix)) {
case WUFFS_BASE__FOURCC__BMP:
// Note that BMP can redirect into another format, which is unsupported.
surface = open_wuffs_using(
wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder,
data, len, error);
break;
case WUFFS_BASE__FOURCC__GIF:
surface = open_wuffs_using(
wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder,
data, len, error);
break;
case WUFFS_BASE__FOURCC__PNG:
surface = open_wuffs_using(
wuffs_png__decoder__alloc_as__wuffs_base__image_decoder,
data, len, error);
break;
case WUFFS_BASE__FOURCC__JPEG:
surface = open_libjpeg_turbo(data, len, error);
break;
default:
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
if ((surface = open_libraw(data, len, error)))
break;
// TODO(p): We should try to pass actual processing errors through,
// notably only continue with LIBRAW_FILE_UNSUPPORTED.
g_clear_error(error);
#endif // HAVE_LIBRAW ---------------------------------------------------------
// TODO(p): Integrate gdk-pixbuf as a fallback (optional dependency).
set_error(error, "unsupported file type");
}
free(data);
return surface;
}

403
fastiv-view.c
View File

@@ -15,28 +15,10 @@
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
#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__ZLIB
#include <math.h>
#include "wuffs-mirror-release-c/release/c/wuffs-v0.3.c"
#include <turbojpeg.h>
#include "config.h"
#include "fastiv-view.h"
#ifdef HAVE_LIBRAW
#include <libraw.h>
#endif // HAVE_LIBRAW
struct _FastivView {
GtkWidget parent_instance;
cairo_surface_t *surface;
@@ -149,394 +131,13 @@ fastiv_view_init(FastivView *self)
// --- Picture loading ---------------------------------------------------------
#define FASTIV_VIEW_ERROR fastiv_view_error_quark()
G_DEFINE_QUARK(fastiv-view-error-quark, fastiv_view_error)
enum FastivViewError {
FASTIV_VIEW_ERROR_OPEN,
};
static void
set_error(GError **error, const char *message)
{
g_set_error_literal(error,
FASTIV_VIEW_ERROR, FASTIV_VIEW_ERROR_OPEN, message);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// 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 cairo_surface_t *
open_wuffs(wuffs_base__image_decoder *dec,
wuffs_base__io_buffer src, GError **error)
{
wuffs_base__image_config cfg;
wuffs_base__status status =
wuffs_base__image_decoder__decode_image_config(dec, &cfg, &src);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
return NULL;
}
if (!wuffs_base__image_config__is_valid(&cfg)) {
set_error(error, "invalid Wuffs image configuration");
return NULL;
}
// We need to check because of the Cairo API.
uint32_t width = wuffs_base__pixel_config__width(&cfg.pixcfg);
uint32_t height = wuffs_base__pixel_config__height(&cfg.pixcfg);
if (width > INT_MAX || height > INT_MAX) {
set_error(error, "image dimensions overflow");
return NULL;
}
// CAIRO_FORMAT_ARGB32: "The 32-bit quantities are stored native-endian.
// Pre-multiplied alpha is used."
// CAIRO_FORMAT_RGB{24,30}: analogous, not going to use these so far.
//
// Wuffs: /doc/note/pixel-formats.md specifies it as "memory order", which,
// for our purposes, means big endian. Currently useful formats, as per
// support within wuffs_base__pixel_swizzler__prepare__*():
// - WUFFS_BASE__PIXEL_FORMAT__ARGB_PREMUL: big-endian
// - WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL: little-endian
// - WUFFS_BASE__PIXEL_FORMAT__XRGB: big-endian
// - WUFFS_BASE__PIXEL_FORMAT__BGRX: little-endian
//
// TODO(p): Make Wuffs support RGB30 as a destination format,
// so far we only have WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE
// and in general, 16-bit depth swizzlers are stubbed.
wuffs_base__pixel_config__set(&cfg.pixcfg,
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL,
#else
WUFFS_BASE__PIXEL_FORMAT__ARGB_PREMUL,
#endif
WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, width, height);
wuffs_base__slice_u8 workbuf = {0};
uint64_t workbuf_len_max_incl =
wuffs_base__image_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");
return NULL;
}
}
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(surface_status));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
// CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be 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};
status = wuffs_base__pixel_buffer__set_from_slice(&pb, &cfg.pixcfg,
wuffs_base__make_slice_u8(cairo_image_surface_get_data(surface),
cairo_image_surface_get_stride(surface) *
cairo_image_surface_get_height(surface)));
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
#if 0 // We're not using this right now.
wuffs_base__frame_config fc = {0};
status = wuffs_png__decoder__decode_frame_config(&dec, &fc, &src);
if (!wuffs_base__status__is_ok(&status)) {
set_error(error, wuffs_base__status__message(&status));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
#endif
// Starting to modify pixel data directly. Probably an unnecessary call.
cairo_surface_flush(surface);
status = wuffs_base__image_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));
cairo_surface_destroy(surface);
free(workbuf.ptr);
return NULL;
}
// Pixel data has been written, need to let Cairo know.
cairo_surface_mark_dirty(surface);
free(workbuf.ptr);
return surface;
}
static cairo_surface_t *
open_wuffs_using(wuffs_base__image_decoder *(*allocate)(),
const gchar *data, gsize len, GError **error)
{
wuffs_base__image_decoder *dec = allocate();
if (!dec) {
set_error(error, "memory allocation failed or internal error");
return NULL;
}
cairo_surface_t *surface = open_wuffs(dec,
wuffs_base__ptr_u8__reader((uint8_t *) data, len, TRUE), error);
free(dec);
return surface;
}
static void
trivial_cmyk_to_bgra(unsigned char *p, int len)
{
// Inspired by gdk-pixbuf's io-jpeg.c:
//
// 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];
p[0] = k * y / 255;
p[1] = k * m / 255;
p[2] = k * c / 255;
p[3] = 255;
p += 4;
}
}
static cairo_surface_t *
open_libjpeg_turbo(const gchar *data, gsize len, GError **error)
{
tjhandle dec = tjInitDecompress();
if (!dec) {
set_error(error, tjGetErrorStr2(dec));
return NULL;
}
int width = 0, height = 0, subsampling = TJSAMP_444, colorspace = TJCS_RGB;
if (tjDecompressHeader3(dec, (const unsigned char *) data, len,
&width, &height, &subsampling, &colorspace)) {
set_error(error, tjGetErrorStr2(dec));
tjDestroy(dec);
return NULL;
}
int pixel_format = (colorspace == TJCS_CMYK || colorspace == TJCS_YCCK)
? TJPF_CMYK
: (G_BYTE_ORDER == G_LITTLE_ENDIAN ? TJPF_BGRA : TJPF_ARGB);
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(surface_status));
cairo_surface_destroy(surface);
tjDestroy(dec);
return NULL;
}
// Starting to modify pixel data directly. Probably an unnecessary call.
cairo_surface_flush(surface);
int stride = cairo_image_surface_get_stride(surface);
if (tjDecompress2(dec, (const unsigned char *) data, len,
cairo_image_surface_get_data(surface), width, stride,
height, pixel_format, TJFLAG_ACCURATEDCT)) {
set_error(error, tjGetErrorStr2(dec));
cairo_surface_destroy(surface);
tjDestroy(dec);
return NULL;
}
// TODO(p): Support big-endian machines, too, those need ARGB ordering.
if (pixel_format == TJPF_CMYK) {
// CAIRO_STRIDE_ALIGNMENT is 4 bytes, so there will be no padding with
// ARGB/BGR/XRGB/BGRX.
trivial_cmyk_to_bgra(cairo_image_surface_get_data(surface),
width * height);
}
// Pixel data has been written, need to let Cairo know.
cairo_surface_mark_dirty(surface);
tjDestroy(dec);
return surface;
}
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
static cairo_surface_t *
open_libraw(const gchar *data, gsize len, 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;
}
#if 0
// TODO(p): Consider setting this--the image is still likely to be
// rendered suboptimally, so why not make it faster.
iprc->params.half_size = 1;
#endif
// 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;
if ((err = libraw_open_buffer(iprc, (void *) data, len))) {
set_error(error, libraw_strerror(err));
libraw_close(iprc);
return NULL;
}
// TODO(p): Do we need to check iprc->idata.raw_count? Maybe for TIFFs?
if ((err = libraw_unpack(iprc))) {
set_error(error, libraw_strerror(err));
libraw_close(iprc);
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));
libraw_close(iprc);
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));
libraw_close(iprc);
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));
libraw_close(iprc);
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);
libraw_close(iprc);
return NULL;
}
int width = image->width, height = image->height;
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_status_t surface_status = cairo_surface_status(surface);
if (surface_status != CAIRO_STATUS_SUCCESS) {
set_error(error, cairo_status_to_string(surface_status));
cairo_surface_destroy(surface);
libraw_dcraw_clear_mem(image);
libraw_close(iprc);
return NULL;
}
// Starting to modify pixel data directly. Probably an unnecessary call.
cairo_surface_flush(surface);
uint32_t *pixels = (uint32_t *) cairo_image_surface_get_data(surface);
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;
}
}
// Pixel data has been written, need to let Cairo know.
cairo_surface_mark_dirty(surface);
libraw_dcraw_clear_mem(image);
libraw_close(iprc);
return surface;
}
#endif // HAVE_LIBRAW ---------------------------------------------------------
// TODO(p): Progressive picture loading, or at least async/cancellable.
gboolean
fastiv_view_open(FastivView *self, const gchar *path, GError **error)
{
// TODO(p): Don't always load everything into memory, test type first,
// for which we only need the first 16 bytes right now.
// Though LibRaw poses an issue--we may want to try to map RAW formats
// to FourCC values--many of them are compliant TIFF files.
// We might want to employ a more generic way of magic identification,
// and with some luck, it could even be integrated into Wuffs.
gchar *data = NULL;
gsize len = 0;
if (!g_file_get_contents(path, &data, &len, error))
return FALSE;
wuffs_base__slice_u8 prefix =
wuffs_base__make_slice_u8((uint8_t *) data, len);
cairo_surface_t *surface = NULL;
switch (wuffs_base__magic_number_guess_fourcc(prefix)) {
case WUFFS_BASE__FOURCC__BMP:
// Note that BMP can redirect into another format, which is unsupported.
surface = open_wuffs_using(
wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder,
data, len, error);
break;
case WUFFS_BASE__FOURCC__GIF:
surface = open_wuffs_using(
wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder,
data, len, error);
break;
case WUFFS_BASE__FOURCC__PNG:
surface = open_wuffs_using(
wuffs_png__decoder__alloc_as__wuffs_base__image_decoder,
data, len, error);
break;
case WUFFS_BASE__FOURCC__JPEG:
surface = open_libjpeg_turbo(data, len, error);
break;
default:
#ifdef HAVE_LIBRAW // ---------------------------------------------------------
if ((surface = open_libraw(data, len, error)))
break;
// TODO(p): We should try to pass actual processing errors through,
// notably only continue with LIBRAW_FILE_UNSUPPORTED.
g_clear_error(error);
#endif // HAVE_LIBRAW ---------------------------------------------------------
// TODO(p): Integrate gdk-pixbuf as a fallback (optional dependency).
set_error(error, "unsupported file type");
}
free(data);
cairo_surface_t *surface = fastiv_io_open(path, error);
if (!surface)
return FALSE;
if (self->surface)
cairo_surface_destroy(self->surface);

3
fastiv-view.h
View File

@@ -24,3 +24,6 @@ G_DECLARE_FINAL_TYPE(FastivView, fastiv_view, FASTIV, VIEW, GtkWidget)
/// Try to open the given file, synchronously, to be displayed by the widget.
gboolean fastiv_view_open(FastivView *self, const gchar *path, GError **error);
// Private, fastiv-io.c
cairo_surface_t *fastiv_io_open(const gchar *path, GError **error);

2
meson.build
View File

@@ -18,7 +18,7 @@ configure_file(
configuration : conf,
)
executable('fastiv', 'fastiv.c', 'fastiv-view.c',
executable('fastiv', 'fastiv.c', 'fastiv-view.c', 'fastiv-io.c',
install : true,
dependencies : [dependencies])