* of the GNU Lesser General Public License.
*/
-#define LOCAL_DEBUG
+#undef LOCAL_DEBUG
#include "lib/lib.h"
+#include "lib/mempool.h"
+#include "lib/fastbuf.h"
#include "images/images.h"
+#include "images/color.h"
+#include "images/io-main.h"
+#include <gif_lib.h>
+
+struct libungif_read_data {
+ GifFileType *gif;
+ int transparent_index;
+};
+
+static int
+libungif_read_func(GifFileType *gif, GifByteType *ptr, int len)
+{
+ DBG("libungif_read_func(len=%d)", len);
+ return bread((struct fastbuf *)gif->UserData, (byte *)ptr, len);
+}
+
+static void
+libungif_read_cancel(struct image_io *io)
+{
+ DBG("libungif_read_cancel()");
+
+ struct libungif_read_data *rd = io->read_data;
+ DGifCloseFile(rd->gif);
+}
int
libungif_read_header(struct image_io *io)
{
- image_thread_err(io->thread, IMAGE_ERR_NOT_IMPLEMENTED, "Libungif read not implemented.");
- return 0;
+ DBG("libungif_read_header()");
+
+ /* Create libungif structure */
+ GifFileType *gif;
+ if (unlikely(!(gif = DGifOpen(io->fastbuf, libungif_read_func))))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Cannot create libungif structure.");
+ return 0;
+ }
+
+ struct libungif_read_data *rd = io->read_data = mp_alloc(io->internal_pool, sizeof(*rd));
+ rd->gif = gif;
+
+ DBG("executing DGifSlurp()");
+ if (unlikely(DGifSlurp(gif) != GIF_OK))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Gif read failed.");
+ DGifCloseFile(gif);
+ return 0;
+ }
+
+ DBG("ImageCount=%d ColorResolution=%d SBackGroundColor=%d SColorMap=%p", gif->ImageCount, gif->SColorResolution, gif->SBackGroundColor, gif->SColorMap);
+ if (unlikely(!gif->ImageCount))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "There are no images in gif file.");
+ DGifCloseFile(gif);
+ return 0;
+ }
+
+ /* Read image parameters */
+ SavedImage *image = gif->SavedImages;
+ if (unlikely(image->ImageDesc.Width <= 0 || image->ImageDesc.Height <= 0 ||
+ image->ImageDesc.Width > (int)IMAGE_MAX_SIZE || image->ImageDesc.Height > (int)IMAGE_MAX_SIZE))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_INVALID_DIMENSIONS, "Invalid gif dimensions.");
+ DGifCloseFile(gif);
+ return 0;
+ }
+ ColorMapObject *color_map = image->ImageDesc.ColorMap ? : gif->SColorMap;
+ if (unlikely(!color_map))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Missing palette.");
+ DGifCloseFile(gif);
+ return 0;
+ }
+ io->cols = image->ImageDesc.Width;
+ io->rows = image->ImageDesc.Height;
+ if (unlikely((io->number_of_colors = color_map->ColorCount) > 256))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Too many gif colors.");
+ DGifCloseFile(gif);
+ return 0;
+ }
+ io->flags = COLOR_SPACE_RGB | IMAGE_IO_HAS_PALETTE;
+
+ /* Search extension blocks */
+ rd->transparent_index = -1;
+ for (int i = 0; i < image->ExtensionBlockCount; i++)
+ {
+ ExtensionBlock *e = image->ExtensionBlocks + i;
+ if (e->Function == 0xF9)
+ {
+ DBG("Found graphics control extension");
+ if (unlikely(e->ByteCount != 4))
+ {
+ image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Invalid graphics control extension.");
+ DGifCloseFile(gif);
+ return 0;
+ }
+ byte *b = e->Bytes;
+ /* transparent color present */
+ if (b[0] & 1)
+ {
+ rd->transparent_index = b[3];
+ io->flags |= IMAGE_ALPHA;
+ if (gif->SColorMap)
+ {
+ GifColorType *background = color_map->Colors + gif->SBackGroundColor;
+ color_make_rgb(&io->background_color, background->Red, background->Green, background->Blue);
+ }
+ }
+ /* We've got everything we need :-) */
+ break;
+ }
+ else
+ DBG("Found unknown extension: type=%d size=%d", e->Function, e->ByteCount);
+ }
+
+ /* Success */
+ io->read_cancel = libungif_read_cancel;
+ return 1;
}
int
-libungif_read_data(struct image_io *io UNUSED)
+libungif_read_data(struct image_io *io)
{
- ASSERT(0);
+ DBG("libungif_read_data()");
+
+ struct libungif_read_data *rd = io->read_data;
+ GifFileType *gif = rd->gif;
+ SavedImage *image = gif->SavedImages;
+
+ /* Prepare image */
+ struct image_io_read_data_internals rdi;
+ if (unlikely(!image_io_read_data_prepare(&rdi, io, image->ImageDesc.Width, image->ImageDesc.Height, io->flags)))
+ {
+ DGifCloseFile(gif);
+ return 0;
+ }
+
+ /* Get pixels and palette */
+ byte *pixels = (byte *)image->RasterBits;
+ ColorMapObject *color_map = image->ImageDesc.ColorMap ? : gif->SColorMap;
+ GifColorType *palette = color_map->Colors;
+ byte *img_end = rdi.image->pixels + rdi.image->image_size;
+
+ /* Handle deinterlacing */
+ uns dein_step, dein_next;
+ if (image->ImageDesc.Interlace)
+ {
+ DBG("Deinterlaced image");
+ dein_step = dein_next = rdi.image->row_size << 3;
+ }
+ else
+ dein_step = dein_next = rdi.image->row_size;
+
+ /* Convert pixels */
+ switch (rdi.image->pixel_size)
+ {
+ case 1:
+ {
+ byte pal[256], *pal_pos = pal, *pal_end = pal + 256;
+ for (uns i = 0; i < (uns)color_map->ColorCount; i++, pal_pos++, palette++)
+ *pal_pos = rgb_to_gray_func(palette->Red, palette->Green, palette->Blue);
+ if (pal_pos != pal_end)
+ bzero(pal_pos, pal_end - pal_pos);
+ if (rd->transparent_index >= 0 && (io->flags & IMAGE_IO_USE_BACKGROUND))
+ color_put_grayscale(pal + rd->transparent_index, &io->background_color);
+# define DO_ROW_END do{ \
+ walk_row_start += dein_step; \
+ if (walk_row_start >= img_end) \
+ { uns n = dein_next >> 1; walk_row_start = rdi.image->pixels + n, dein_step = dein_next; dein_next = n; } \
+ }while(0)
+# define IMAGE_WALK_PREFIX(x) walk_##x
+# define IMAGE_WALK_INLINE
+# define IMAGE_WALK_IMAGE (rdi.image)
+# define IMAGE_WALK_UNROLL 4
+# define IMAGE_WALK_COL_STEP 1
+# define IMAGE_WALK_ROW_STEP 0
+# define IMAGE_WALK_DO_STEP do{ *walk_pos = pal[*pixels++]; }while(0)
+# define IMAGE_WALK_DO_ROW_END DO_ROW_END
+# include "images/image-walk.h"
+ break;
+ }
+ case 2:
+ {
+ byte pal[256 * 2], *pal_pos = pal, *pal_end = pal + 256 * 2;
+ for (uns i = 0; i < (uns)color_map->ColorCount; i++, pal_pos += 2, palette++)
+ {
+ pal_pos[0] = rgb_to_gray_func(palette->Red, palette->Green, palette->Blue);
+ pal_pos[1] = 255;
+ }
+ if (pal_pos != pal_end)
+ bzero(pal_pos, pal_end - pal_pos);
+ if (rd->transparent_index >= 0)
+ pal[rd->transparent_index * 2 + 1] = 0;
+# define IMAGE_WALK_PREFIX(x) walk_##x
+# define IMAGE_WALK_INLINE
+# define IMAGE_WALK_IMAGE (rdi.image)
+# define IMAGE_WALK_UNROLL 4
+# define IMAGE_WALK_COL_STEP 2
+# define IMAGE_WALK_ROW_STEP 0
+# define IMAGE_WALK_DO_STEP do{ *(u16 *)walk_pos = ((u16 *)pal)[*pixels++]; }while(0)
+# define IMAGE_WALK_DO_ROW_END DO_ROW_END
+# include "images/image-walk.h"
+ break;
+ }
+ case 3:
+ {
+ byte pal[256 * 4], *pal_pos = pal, *pal_end = pal + 256 * 4;
+ for (uns i = 0; i < (uns)color_map->ColorCount; i++, pal_pos += 4, palette++)
+ {
+ pal_pos[0] = palette->Red;
+ pal_pos[1] = palette->Green;
+ pal_pos[2] = palette->Blue;
+ }
+ if (pal_pos != pal_end)
+ bzero(pal_pos, pal_end - pal_pos);
+ if (rd->transparent_index >= 0 && (io->flags & IMAGE_IO_USE_BACKGROUND))
+ color_put_rgb(pal + 4 * rd->transparent_index, &io->background_color);
+# define IMAGE_WALK_PREFIX(x) walk_##x
+# define IMAGE_WALK_INLINE
+# define IMAGE_WALK_IMAGE (rdi.image)
+# define IMAGE_WALK_UNROLL 4
+# define IMAGE_WALK_COL_STEP 3
+# define IMAGE_WALK_ROW_STEP 0
+# define IMAGE_WALK_DO_STEP do{ byte *p = pal + 4 * (*pixels++); walk_pos[0] = p[0]; walk_pos[1] = p[1]; walk_pos[2] = p[2]; }while(0)
+# define IMAGE_WALK_DO_ROW_END DO_ROW_END
+# include "images/image-walk.h"
+ break;
+ }
+ case 4:
+ {
+ byte pal[256 * 4], *pal_pos = pal, *pal_end = pal + 256 * 4;
+ for (uns i = 0; i < (uns)color_map->ColorCount; i++, pal_pos += 4, palette++)
+ {
+ pal_pos[0] = palette->Red;
+ pal_pos[1] = palette->Green;
+ pal_pos[2] = palette->Blue;
+ pal_pos[3] = 255;
+ }
+ if (pal_pos != pal_end)
+ bzero(pal_pos, pal_end - pal_pos);
+ if (rd->transparent_index >= 0)
+ pal[rd->transparent_index * 4 + 3] = 0;
+# define IMAGE_WALK_PREFIX(x) walk_##x
+# define IMAGE_WALK_INLINE
+# define IMAGE_WALK_IMAGE (rdi.image)
+# define IMAGE_WALK_UNROLL 4
+# define IMAGE_WALK_COL_STEP 4
+# define IMAGE_WALK_ROW_STEP 0
+# define IMAGE_WALK_DO_STEP do{ *(u32 *)walk_pos = ((u32 *)pal)[*pixels++]; }while(0)
+# define IMAGE_WALK_DO_ROW_END DO_ROW_END
+# include "images/image-walk.h"
+ break;
+ }
+ default:
+ ASSERT(0);
+ }
+
+ /* Destroy libungif structure */
+ DGifCloseFile(gif);
+
+ /* Finish image */
+ return image_io_read_data_finish(&rdi, io);
}
projects / libucw.git / blobdiff