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Refactor fiv_thumbnail_extract()

This commit is contained in:
Přemysl Eric Janouch 2023-06-04 21:12:19 +02:00
parent 1e8fe1411b
commit a5b5e32c3b
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 129 additions and 97 deletions
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224
fiv-thumbnail.c
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@ -240,18 +240,100 @@ orient_thumbnail(cairo_surface_t *surface, FivIoOrientation orientation)
return oriented; return oriented;
} }
cairo_surface_t * // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
#ifdef HAVE_LIBRAW
static cairo_surface_t *
extract_libraw_bitmap(
libraw_data_t *iprc, libraw_processed_image_t *image, GError **error)
{ {
const char *path = g_file_peek_path(target); // Anything else is extremely rare.
if (!path) { if (image->colors != 3 || image->bits != 8) {
set_error(error, "thumbnails will only be extracted from local files"); set_error(error, "unsupported bitmap thumbnail");
return NULL; return NULL;
} }
GMappedFile *mf = g_mapped_file_new(path, FALSE, error); cairo_surface_t *surface = cairo_image_surface_create(
if (!mf) CAIRO_FORMAT_RGB24, image->width, image->height);
guint32 *out = (guint32 *) cairo_image_surface_get_data(surface);
const unsigned char *in = image->data;
for (guint64 i = 0; i < image->width * image->height; in += 3)
out[i++] = in[0] << 16 | in[1] << 8 | in[2];
cairo_surface_mark_dirty(surface);
// LibRaw actually turns an 8 to 5, so follow the documentation.
FivIoOrientation orient = FivIoOrientationUnknown;
switch (iprc->sizes.flip) {
break; case 3:
orient = FivIoOrientation180;
break; case 5:
orient = FivIoOrientation270;
break; case 6:
orient = FivIoOrientation90;
break; default:
return surface;
}
cairo_surface_set_user_data(
surface, &fiv_io_key_orientation, (void *) (intptr_t) orient, NULL);
return surface;
}
static cairo_surface_t *
extract_libraw(GFile *target, GMappedFile *mf, GError **error)
{
cairo_surface_t *surface = NULL;
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; return NULL;
}
int err = 0;
if ((err = libraw_open_buffer(iprc, (void *) g_mapped_file_get_contents(mf),
g_mapped_file_get_length(mf)))) {
set_error(error, libraw_strerror(err));
goto fail;
}
#if LIBRAW_VERSION >= LIBRAW_MAKE_VERSION(0, 21, 0)
if (!iprc->thumbs_list.thumbcount) {
set_error(error, "no thumbnails found");
goto fail;
}
// The old libraw_unpack_thumb() goes for the largest thumbnail,
// but we currently want the smallest thumbnail.
// TODO(p): To handle the ugly IFD0 thumbnail of NEF,
// try to go for the second smallest size. Remember to reflect tflip.
int best_index = 0;
float best_pixels = INFINITY;
for (int i = 0; i < iprc->thumbs_list.thumbcount; i++) {
float pixels = (float) iprc->thumbs_list.thumblist[i].twidth *
(float) iprc->thumbs_list.thumblist[i].theight;
if (pixels && pixels < best_pixels) {
best_index = i;
best_pixels = pixels;
}
}
if ((err = libraw_unpack_thumb_ex(iprc, best_index))) {
set_error(error, libraw_strerror(err));
goto fail;
}
#else // LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0)
if ((err = libraw_unpack_thumb(iprc))) {
set_error(error, libraw_strerror(err));
goto fail;
}
#endif // LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0)
libraw_processed_image_t *image = libraw_dcraw_make_mem_thumb(iprc, &err);
if (!image) {
set_error(error, libraw_strerror(err));
goto fail;
}
// Bitmap thumbnails generally need rotating, e.g.: // Bitmap thumbnails generally need rotating, e.g.:
// - Hasselblad/H4D-50/2-9-2017_street_0012.fff // - Hasselblad/H4D-50/2-9-2017_street_0012.fff
@ -275,114 +357,64 @@ fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
// Exif Orientation 6, and sizes.flip also contains 6. // Exif Orientation 6, and sizes.flip also contains 6.
// - Nokia/Lumia 1020/RAW_NOKIA_LUMIA_1020.DNG (bitmap) has wrong color. // - Nokia/Lumia 1020/RAW_NOKIA_LUMIA_1020.DNG (bitmap) has wrong color.
// - Ricoh/GXR/R0017428.DNG (JPEG) seems to be plainly invalid. // - Ricoh/GXR/R0017428.DNG (JPEG) seems to be plainly invalid.
FivIoOrientation orientation = FivIoOrientationUnknown;
cairo_surface_t *surface = NULL;
#ifndef HAVE_LIBRAW
// TODO(p): Implement our own thumbnail extractors.
set_error(error, "unsupported file");
#else // HAVE_LIBRAW
// In this case, g_mapped_file_get_contents() returns NULL, causing issues.
if (!g_mapped_file_get_length(mf)) {
set_error(error, "empty file");
goto fail;
}
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");
goto fail;
}
int err = 0;
if ((err = libraw_open_buffer(iprc, (void *) g_mapped_file_get_contents(mf),
g_mapped_file_get_length(mf)))) {
set_error(error, libraw_strerror(err));
goto fail_libraw;
}
#if LIBRAW_VERSION >= LIBRAW_MAKE_VERSION(0, 21, 0)
if (!iprc->thumbs_list.thumbcount) {
set_error(error, "no thumbnails found");
goto fail_libraw;
}
// The old libraw_unpack_thumb() goes for the largest thumbnail,
// but we currently want the smallest thumbnail.
// TODO(p): To handle the ugly IFD0 thumbnail of NEF,
// try to go for the second smallest size. Remember to reflect tflip.
int best_index = 0;
float best_pixels = INFINITY;
for (int i = 0; i < iprc->thumbs_list.thumbcount; i++) {
float pixels = (float) iprc->thumbs_list.thumblist[i].twidth *
(float) iprc->thumbs_list.thumblist[i].theight;
if (pixels && pixels < best_pixels) {
best_index = i;
best_pixels = pixels;
}
}
if ((err = libraw_unpack_thumb_ex(iprc, best_index))) {
set_error(error, libraw_strerror(err));
goto fail_libraw;
}
#else
if ((err = libraw_unpack_thumb(iprc))) {
set_error(error, libraw_strerror(err));
goto fail_libraw;
}
#endif
libraw_processed_image_t *image = libraw_dcraw_make_mem_thumb(iprc, &err);
if (!image) {
set_error(error, libraw_strerror(err));
goto fail_libraw;
}
gboolean dummy = FALSE;
switch (image->type) { switch (image->type) {
gboolean dummy;
case LIBRAW_IMAGE_JPEG: case LIBRAW_IMAGE_JPEG:
surface = render( surface = render(
target, g_bytes_new(image->data, image->data_size), &dummy, error); target, g_bytes_new(image->data, image->data_size), &dummy, error);
orientation = (int) (intptr_t) cairo_surface_get_user_data(
surface, &fiv_io_key_orientation);
break; break;
case LIBRAW_IMAGE_BITMAP: case LIBRAW_IMAGE_BITMAP:
// Anything else is extremely rare. surface = extract_libraw_bitmap(iprc, image, error);
if (image->colors != 3 || image->bits != 8) {
set_error(error, "unsupported bitmap thumbnail");
break;
}
surface = cairo_image_surface_create(
CAIRO_FORMAT_RGB24, image->width, image->height);
guint32 *out = (guint32 *) cairo_image_surface_get_data(surface);
const unsigned char *in = image->data;
for (guint64 i = 0; i < image->width * image->height; in += 3)
out[i++] = in[0] << 16 | in[1] << 8 | in[2];
cairo_surface_mark_dirty(surface);
// LibRaw actually turns an 8 to 5, so follow the documentation.
switch (iprc->sizes.flip) {
break; case 3: orientation = FivIoOrientation180;
break; case 5: orientation = FivIoOrientation270;
break; case 6: orientation = FivIoOrientation90;
}
break; break;
default: default:
set_error(error, "unsupported embedded thumbnail"); set_error(error, "unsupported embedded thumbnail");
} }
libraw_dcraw_clear_mem(image); libraw_dcraw_clear_mem(image);
fail_libraw: fail:
libraw_close(iprc); libraw_close(iprc);
return surface;
}
#endif // HAVE_LIBRAW #endif // HAVE_LIBRAW
fail: // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
cairo_surface_t *
fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
{
const char *path = g_file_peek_path(target);
if (!path) {
set_error(error, "thumbnails will only be extracted from local files");
return NULL;
}
GMappedFile *mf = g_mapped_file_new(path, FALSE, error);
if (!mf)
return NULL;
// In this case, g_mapped_file_get_contents() returns NULL, causing issues.
if (!g_mapped_file_get_length(mf)) {
set_error(error, "empty file");
return NULL;
}
cairo_surface_t *surface = NULL;
#ifdef HAVE_LIBRAW
surface = extract_libraw(target, mf, error);
#else // ! HAVE_LIBRAW
// TODO(p): Implement our own thumbnail extractors.
set_error(error, "unsupported file");
#endif // ! HAVE_LIBRAW
g_mapped_file_unref(mf); g_mapped_file_unref(mf);
// This hardcodes Exif orientation before adjust_thumbnail() might do so, // Hardcode Exif orientation before adjust_thumbnail() might do so,
// before the early return below. // before the early return below.
if (surface) {
int orientation = (intptr_t) cairo_surface_get_user_data(
surface, &fiv_io_key_orientation);
surface = orient_thumbnail(surface, orientation); surface = orient_thumbnail(surface, orientation);
}
if (!surface || max_size < FIV_THUMBNAIL_SIZE_MIN || if (!surface || max_size < FIV_THUMBNAIL_SIZE_MIN ||
max_size > FIV_THUMBNAIL_SIZE_MAX) max_size > FIV_THUMBNAIL_SIZE_MAX)
return surface; return surface;