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307 lines
9.4 KiB
307 lines
9.4 KiB
2 months ago
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/*
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* Image Library -- libungif
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*
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* (c) 2006 Pavel Charvat <pchar@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#undef LOCAL_DEBUG
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#include <ucw/lib.h>
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#include <ucw/mempool.h>
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#include <ucw/fastbuf.h>
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#include <images/images.h>
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#include <images/error.h>
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#include <images/color.h>
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#include <images/io-main.h>
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#include <gif_lib.h>
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// API of gif_lib has changed recenly
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#ifndef GIFLIB_MAJOR
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#define GIFLIB_MAJOR 0
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#endif
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#if GIFLIB_MAJOR > 5 || GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1
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static int dgif_error_code; // Scratch pad only, no locking needed
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#define DGIF_OPEN(_userptr, _readfunc) DGifOpen(_userptr, _readfunc, &dgif_error_code)
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#define DGIF_CLOSE_FILE(_gif) DGifCloseFile(_gif, &dgif_error_code)
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#else
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#define DGIF_OPEN(_userptr, _readfunc) DGifOpen(_userptr, _readfunc)
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#define DGIF_CLOSE_FILE(_gif) DGifCloseFile(_gif)
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#endif
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struct libungif_read_data {
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GifFileType *gif;
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int transparent_index;
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};
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static int
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libungif_read_func(GifFileType *gif, GifByteType *ptr, int len)
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{
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DBG("libungif_read_func(len=%d)", len);
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return bread((struct fastbuf *)gif->UserData, (byte *)ptr, len);
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}
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static void
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libungif_read_cancel(struct image_io *io)
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{
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DBG("libungif_read_cancel()");
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struct libungif_read_data *rd = io->read_data;
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DGIF_CLOSE_FILE(rd->gif);
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}
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int
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libungif_read_header(struct image_io *io)
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{
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DBG("libungif_read_header()");
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/* Create libungif structure */
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GifFileType *gif;
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if (unlikely(!(gif = DGIF_OPEN(io->fastbuf, libungif_read_func))))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_READ_FAILED, "Cannot create libungif structure.");
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return 0;
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}
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struct libungif_read_data *rd = io->read_data = mp_alloc(io->internal_pool, sizeof(*rd));
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rd->gif = gif;
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DBG("executing DGifSlurp()");
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if (unlikely(DGifSlurp(gif) != GIF_OK))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_READ_FAILED, "Gif read failed.");
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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DBG("ImageCount=%d ColorResolution=%d SBackGroundColor=%d SColorMap=%p", gif->ImageCount, gif->SColorResolution, gif->SBackGroundColor, gif->SColorMap);
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if (unlikely(!gif->ImageCount))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_READ_FAILED, "There are no images in gif file.");
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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/* Read image parameters */
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SavedImage *image = gif->SavedImages;
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if (unlikely(image->ImageDesc.Width <= 0 || image->ImageDesc.Height <= 0 ||
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image->ImageDesc.Width > (int)image_max_dim || image->ImageDesc.Height > (int)image_max_dim))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_INVALID_DIMENSIONS, "Invalid gif dimensions.");
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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ColorMapObject *color_map = image->ImageDesc.ColorMap ? : gif->SColorMap;
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if (unlikely(!color_map))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_READ_FAILED, "Missing palette.");
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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io->cols = image->ImageDesc.Width;
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io->rows = image->ImageDesc.Height;
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if (unlikely((io->number_of_colors = color_map->ColorCount) > 256))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_READ_FAILED, "Too many gif colors.");
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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io->flags = COLOR_SPACE_RGB | IMAGE_IO_HAS_PALETTE;
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/* Search extension blocks */
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rd->transparent_index = -1;
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for (int i = 0; i < image->ExtensionBlockCount; i++)
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{
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ExtensionBlock *e = image->ExtensionBlocks + i;
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if (e->Function == 0xF9)
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{
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DBG("Found graphics control extension");
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if (unlikely(e->ByteCount != 4))
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{
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IMAGE_ERROR(io->context, IMAGE_ERROR_READ_FAILED, "Invalid graphics control extension.");
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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byte *b = e->Bytes;
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/* transparent color present */
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if (b[0] & 1)
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{
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rd->transparent_index = b[3];
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io->flags |= IMAGE_ALPHA;
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if (gif->SColorMap)
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{
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GifColorType *background = color_map->Colors + gif->SBackGroundColor;
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color_make_rgb(&io->background_color, background->Red, background->Green, background->Blue);
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}
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}
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/* We've got everything we need :-) */
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break;
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}
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else
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DBG("Found unknown extension: type=%d size=%d", e->Function, e->ByteCount);
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}
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/* Success */
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io->read_cancel = libungif_read_cancel;
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return 1;
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}
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int
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libungif_read_data(struct image_io *io)
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{
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DBG("libungif_read_data()");
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struct libungif_read_data *rd = io->read_data;
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GifFileType *gif = rd->gif;
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SavedImage *image = gif->SavedImages;
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/* Prepare image */
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struct image_io_read_data_internals rdi;
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uint read_flags = io->flags;
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uint cs = read_flags & IMAGE_COLOR_SPACE;
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if (cs != COLOR_SPACE_GRAYSCALE && cs != COLOR_SPACE_RGB)
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read_flags = (read_flags & ~IMAGE_COLOR_SPACE & IMAGE_CHANNELS_FORMAT) | COLOR_SPACE_RGB;
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if (unlikely(!image_io_read_data_prepare(&rdi, io, image->ImageDesc.Width, image->ImageDesc.Height, read_flags)))
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{
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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/* Get pixels and palette */
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byte *pixels = (byte *)image->RasterBits;
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ColorMapObject *color_map = image->ImageDesc.ColorMap ? : gif->SColorMap;
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GifColorType *palette = color_map->Colors;
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byte *img_end = rdi.image->pixels + rdi.image->image_size;
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/* Handle deinterlacing */
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uint dein_step, dein_next;
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if (image->ImageDesc.Interlace)
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{
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DBG("Deinterlaced image");
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dein_step = dein_next = rdi.image->row_size << 3;
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}
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else
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dein_step = dein_next = rdi.image->row_size;
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/* Convert pixels */
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switch (rdi.image->pixel_size)
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{
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case 1:
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{
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byte pal[256], *pal_pos = pal, *pal_end = pal + 256;
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for (uint i = 0; i < (uint)color_map->ColorCount; i++, pal_pos++, palette++)
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*pal_pos = rgb_to_gray_func(palette->Red, palette->Green, palette->Blue);
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if (pal_pos != pal_end)
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bzero(pal_pos, pal_end - pal_pos);
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if (rd->transparent_index >= 0 && (io->flags & IMAGE_IO_USE_BACKGROUND))
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if (!color_put(io->context, &io->background_color, pal + rd->transparent_index, COLOR_SPACE_GRAYSCALE))
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{
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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# define DO_ROW_END do{ \
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walk_row_start += dein_step; \
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while (walk_row_start >= img_end) \
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{ uint n = dein_next >> 1; walk_row_start = rdi.image->pixels + n, dein_step = dein_next; dein_next = n; } \
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}while(0)
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# define IMAGE_WALK_PREFIX(x) walk_##x
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# define IMAGE_WALK_INLINE
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# define IMAGE_WALK_IMAGE (rdi.image)
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# define IMAGE_WALK_UNROLL 4
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# define IMAGE_WALK_COL_STEP 1
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# define IMAGE_WALK_ROW_STEP 0
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# define IMAGE_WALK_DO_STEP do{ *walk_pos = pal[*pixels++]; }while(0)
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# define IMAGE_WALK_DO_ROW_END DO_ROW_END
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# include <images/image-walk.h>
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break;
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}
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case 2:
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{
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byte pal[256 * 2], *pal_pos = pal, *pal_end = pal + 256 * 2;
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for (uint i = 0; i < (uint)color_map->ColorCount; i++, pal_pos += 2, palette++)
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{
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pal_pos[0] = rgb_to_gray_func(palette->Red, palette->Green, palette->Blue);
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pal_pos[1] = 255;
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}
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if (pal_pos != pal_end)
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bzero(pal_pos, pal_end - pal_pos);
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if (rd->transparent_index >= 0)
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pal[rd->transparent_index * 2 + 1] = 0;
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# define IMAGE_WALK_PREFIX(x) walk_##x
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# define IMAGE_WALK_INLINE
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# define IMAGE_WALK_IMAGE (rdi.image)
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# define IMAGE_WALK_UNROLL 4
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# define IMAGE_WALK_COL_STEP 2
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# define IMAGE_WALK_ROW_STEP 0
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# define IMAGE_WALK_DO_STEP do{ *(u16 *)walk_pos = ((u16 *)pal)[*pixels++]; }while(0)
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# define IMAGE_WALK_DO_ROW_END DO_ROW_END
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# include <images/image-walk.h>
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break;
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}
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case 3:
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{
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byte pal[256 * 4], *pal_pos = pal, *pal_end = pal + 256 * 4;
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for (uint i = 0; i < (uint)color_map->ColorCount; i++, pal_pos += 4, palette++)
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{
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pal_pos[0] = palette->Red;
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pal_pos[1] = palette->Green;
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pal_pos[2] = palette->Blue;
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}
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if (pal_pos != pal_end)
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bzero(pal_pos, pal_end - pal_pos);
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if (rd->transparent_index >= 0 && (io->flags & IMAGE_IO_USE_BACKGROUND))
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if (!color_put(io->context, &io->background_color, pal + 4 * rd->transparent_index, COLOR_SPACE_RGB))
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{
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DGIF_CLOSE_FILE(gif);
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return 0;
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}
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# define IMAGE_WALK_PREFIX(x) walk_##x
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# define IMAGE_WALK_INLINE
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# define IMAGE_WALK_IMAGE (rdi.image)
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# define IMAGE_WALK_UNROLL 4
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# define IMAGE_WALK_COL_STEP 3
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# define IMAGE_WALK_ROW_STEP 0
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# 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)
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# define IMAGE_WALK_DO_ROW_END DO_ROW_END
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# include <images/image-walk.h>
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break;
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}
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case 4:
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{
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byte pal[256 * 4], *pal_pos = pal, *pal_end = pal + 256 * 4;
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for (uint i = 0; i < (uint)color_map->ColorCount; i++, pal_pos += 4, palette++)
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{
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pal_pos[0] = palette->Red;
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pal_pos[1] = palette->Green;
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pal_pos[2] = palette->Blue;
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pal_pos[3] = 255;
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}
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if (pal_pos != pal_end)
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bzero(pal_pos, pal_end - pal_pos);
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if (rd->transparent_index >= 0)
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pal[rd->transparent_index * 4 + 3] = 0;
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# define IMAGE_WALK_PREFIX(x) walk_##x
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# define IMAGE_WALK_INLINE
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# define IMAGE_WALK_IMAGE (rdi.image)
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# define IMAGE_WALK_UNROLL 4
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# define IMAGE_WALK_COL_STEP 4
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# define IMAGE_WALK_ROW_STEP 0
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# define IMAGE_WALK_DO_STEP do{ *(u32 *)walk_pos = ((u32 *)pal)[*pixels++]; }while(0)
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# define IMAGE_WALK_DO_ROW_END DO_ROW_END
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# include <images/image-walk.h>
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break;
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}
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default:
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ASSERT(0);
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}
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/* Destroy libungif structure */
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DGIF_CLOSE_FILE(gif);
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/* Finish image */
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return image_io_read_data_finish(&rdi, io);
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}
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