Refactor fiv_thumbnail_extract()
This commit is contained in:
226
fiv-thumbnail.c
226
fiv-thumbnail.c
@@ -240,18 +240,100 @@ orient_thumbnail(cairo_surface_t *surface, FivIoOrientation orientation)
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return oriented;
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}
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cairo_surface_t *
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fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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#ifdef HAVE_LIBRAW
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static cairo_surface_t *
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extract_libraw_bitmap(
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libraw_data_t *iprc, libraw_processed_image_t *image, GError **error)
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{
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const char *path = g_file_peek_path(target);
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if (!path) {
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set_error(error, "thumbnails will only be extracted from local files");
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// Anything else is extremely rare.
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if (image->colors != 3 || image->bits != 8) {
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set_error(error, "unsupported bitmap thumbnail");
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return NULL;
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}
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GMappedFile *mf = g_mapped_file_new(path, FALSE, error);
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if (!mf)
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cairo_surface_t *surface = cairo_image_surface_create(
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CAIRO_FORMAT_RGB24, image->width, image->height);
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guint32 *out = (guint32 *) cairo_image_surface_get_data(surface);
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const unsigned char *in = image->data;
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for (guint64 i = 0; i < image->width * image->height; in += 3)
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out[i++] = in[0] << 16 | in[1] << 8 | in[2];
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cairo_surface_mark_dirty(surface);
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// LibRaw actually turns an 8 to 5, so follow the documentation.
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FivIoOrientation orient = FivIoOrientationUnknown;
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switch (iprc->sizes.flip) {
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break; case 3:
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orient = FivIoOrientation180;
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break; case 5:
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orient = FivIoOrientation270;
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break; case 6:
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orient = FivIoOrientation90;
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break; default:
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return surface;
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}
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cairo_surface_set_user_data(
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surface, &fiv_io_key_orientation, (void *) (intptr_t) orient, NULL);
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return surface;
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}
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static cairo_surface_t *
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extract_libraw(GFile *target, GMappedFile *mf, GError **error)
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{
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cairo_surface_t *surface = NULL;
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libraw_data_t *iprc = libraw_init(
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LIBRAW_OPIONS_NO_MEMERR_CALLBACK | LIBRAW_OPIONS_NO_DATAERR_CALLBACK);
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if (!iprc) {
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set_error(error, "failed to obtain a LibRaw handle");
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return NULL;
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}
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int err = 0;
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if ((err = libraw_open_buffer(iprc, (void *) g_mapped_file_get_contents(mf),
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g_mapped_file_get_length(mf)))) {
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set_error(error, libraw_strerror(err));
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goto fail;
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}
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#if LIBRAW_VERSION >= LIBRAW_MAKE_VERSION(0, 21, 0)
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if (!iprc->thumbs_list.thumbcount) {
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set_error(error, "no thumbnails found");
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goto fail;
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}
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// The old libraw_unpack_thumb() goes for the largest thumbnail,
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// but we currently want the smallest thumbnail.
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// TODO(p): To handle the ugly IFD0 thumbnail of NEF,
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// try to go for the second smallest size. Remember to reflect tflip.
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int best_index = 0;
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float best_pixels = INFINITY;
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for (int i = 0; i < iprc->thumbs_list.thumbcount; i++) {
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float pixels = (float) iprc->thumbs_list.thumblist[i].twidth *
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(float) iprc->thumbs_list.thumblist[i].theight;
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if (pixels && pixels < best_pixels) {
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best_index = i;
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best_pixels = pixels;
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}
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}
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if ((err = libraw_unpack_thumb_ex(iprc, best_index))) {
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set_error(error, libraw_strerror(err));
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goto fail;
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}
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#else // LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0)
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if ((err = libraw_unpack_thumb(iprc))) {
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set_error(error, libraw_strerror(err));
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goto fail;
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}
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#endif // LIBRAW_VERSION < LIBRAW_MAKE_VERSION(0, 21, 0)
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libraw_processed_image_t *image = libraw_dcraw_make_mem_thumb(iprc, &err);
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if (!image) {
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set_error(error, libraw_strerror(err));
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goto fail;
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}
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// Bitmap thumbnails generally need rotating, e.g.:
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// - Hasselblad/H4D-50/2-9-2017_street_0012.fff
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@@ -275,114 +357,64 @@ fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
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// Exif Orientation 6, and sizes.flip also contains 6.
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// - Nokia/Lumia 1020/RAW_NOKIA_LUMIA_1020.DNG (bitmap) has wrong color.
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// - Ricoh/GXR/R0017428.DNG (JPEG) seems to be plainly invalid.
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FivIoOrientation orientation = FivIoOrientationUnknown;
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cairo_surface_t *surface = NULL;
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#ifndef HAVE_LIBRAW
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// TODO(p): Implement our own thumbnail extractors.
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set_error(error, "unsupported file");
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#else // HAVE_LIBRAW
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// In this case, g_mapped_file_get_contents() returns NULL, causing issues.
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if (!g_mapped_file_get_length(mf)) {
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set_error(error, "empty file");
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goto fail;
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}
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libraw_data_t *iprc = libraw_init(
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LIBRAW_OPIONS_NO_MEMERR_CALLBACK | LIBRAW_OPIONS_NO_DATAERR_CALLBACK);
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if (!iprc) {
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set_error(error, "failed to obtain a LibRaw handle");
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goto fail;
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}
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int err = 0;
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if ((err = libraw_open_buffer(iprc, (void *) g_mapped_file_get_contents(mf),
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g_mapped_file_get_length(mf)))) {
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set_error(error, libraw_strerror(err));
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goto fail_libraw;
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}
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#if LIBRAW_VERSION >= LIBRAW_MAKE_VERSION(0, 21, 0)
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if (!iprc->thumbs_list.thumbcount) {
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set_error(error, "no thumbnails found");
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goto fail_libraw;
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}
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// The old libraw_unpack_thumb() goes for the largest thumbnail,
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// but we currently want the smallest thumbnail.
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// TODO(p): To handle the ugly IFD0 thumbnail of NEF,
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// try to go for the second smallest size. Remember to reflect tflip.
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int best_index = 0;
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float best_pixels = INFINITY;
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for (int i = 0; i < iprc->thumbs_list.thumbcount; i++) {
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float pixels = (float) iprc->thumbs_list.thumblist[i].twidth *
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(float) iprc->thumbs_list.thumblist[i].theight;
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if (pixels && pixels < best_pixels) {
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best_index = i;
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best_pixels = pixels;
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}
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}
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if ((err = libraw_unpack_thumb_ex(iprc, best_index))) {
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set_error(error, libraw_strerror(err));
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goto fail_libraw;
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}
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#else
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if ((err = libraw_unpack_thumb(iprc))) {
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set_error(error, libraw_strerror(err));
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goto fail_libraw;
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}
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#endif
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libraw_processed_image_t *image = libraw_dcraw_make_mem_thumb(iprc, &err);
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if (!image) {
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set_error(error, libraw_strerror(err));
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goto fail_libraw;
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}
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gboolean dummy = FALSE;
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switch (image->type) {
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gboolean dummy;
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case LIBRAW_IMAGE_JPEG:
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surface = render(
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target, g_bytes_new(image->data, image->data_size), &dummy, error);
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orientation = (int) (intptr_t) cairo_surface_get_user_data(
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surface, &fiv_io_key_orientation);
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break;
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case LIBRAW_IMAGE_BITMAP:
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// Anything else is extremely rare.
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if (image->colors != 3 || image->bits != 8) {
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set_error(error, "unsupported bitmap thumbnail");
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break;
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}
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surface = cairo_image_surface_create(
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CAIRO_FORMAT_RGB24, image->width, image->height);
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guint32 *out = (guint32 *) cairo_image_surface_get_data(surface);
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const unsigned char *in = image->data;
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for (guint64 i = 0; i < image->width * image->height; in += 3)
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out[i++] = in[0] << 16 | in[1] << 8 | in[2];
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cairo_surface_mark_dirty(surface);
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// LibRaw actually turns an 8 to 5, so follow the documentation.
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switch (iprc->sizes.flip) {
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break; case 3: orientation = FivIoOrientation180;
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break; case 5: orientation = FivIoOrientation270;
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break; case 6: orientation = FivIoOrientation90;
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}
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surface = extract_libraw_bitmap(iprc, image, error);
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break;
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default:
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set_error(error, "unsupported embedded thumbnail");
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}
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libraw_dcraw_clear_mem(image);
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fail_libraw:
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fail:
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libraw_close(iprc);
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return surface;
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}
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#endif // HAVE_LIBRAW
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fail:
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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cairo_surface_t *
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fiv_thumbnail_extract(GFile *target, FivThumbnailSize max_size, GError **error)
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{
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const char *path = g_file_peek_path(target);
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if (!path) {
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set_error(error, "thumbnails will only be extracted from local files");
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return NULL;
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}
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GMappedFile *mf = g_mapped_file_new(path, FALSE, error);
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if (!mf)
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return NULL;
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// In this case, g_mapped_file_get_contents() returns NULL, causing issues.
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if (!g_mapped_file_get_length(mf)) {
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set_error(error, "empty file");
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return NULL;
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}
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cairo_surface_t *surface = NULL;
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#ifdef HAVE_LIBRAW
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surface = extract_libraw(target, mf, error);
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#else // ! HAVE_LIBRAW
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// TODO(p): Implement our own thumbnail extractors.
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set_error(error, "unsupported file");
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#endif // ! HAVE_LIBRAW
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g_mapped_file_unref(mf);
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// This hardcodes Exif orientation before adjust_thumbnail() might do so,
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// Hardcode Exif orientation before adjust_thumbnail() might do so,
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// before the early return below.
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surface = orient_thumbnail(surface, orientation);
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if (surface) {
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int orientation = (intptr_t) cairo_surface_get_user_data(
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surface, &fiv_io_key_orientation);
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surface = orient_thumbnail(surface, orientation);
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}
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if (!surface || max_size < FIV_THUMBNAIL_SIZE_MIN ||
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max_size > FIV_THUMBNAIL_SIZE_MAX)
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return surface;
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