Green Sky
67653bbe50
git-subtree-dir: external/libwebp/libwebp git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f
117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// GIF decode.
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#ifndef WEBP_EXAMPLES_GIFDEC_H_
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#define WEBP_EXAMPLES_GIFDEC_H_
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#include <stdio.h>
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#include "webp/types.h"
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#ifdef HAVE_CONFIG_H
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#include "webp/config.h"
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#endif
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#ifdef WEBP_HAVE_GIF
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#include <gif_lib.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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// GIFLIB_MAJOR is only defined in libgif >= 4.2.0.
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#if defined(GIFLIB_MAJOR) && defined(GIFLIB_MINOR)
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# define LOCAL_GIF_VERSION ((GIFLIB_MAJOR << 8) | GIFLIB_MINOR)
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# define LOCAL_GIF_PREREQ(maj, min) \
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(LOCAL_GIF_VERSION >= (((maj) << 8) | (min)))
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#else
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# define LOCAL_GIF_VERSION 0
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# define LOCAL_GIF_PREREQ(maj, min) 0
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#endif
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#define GIF_INDEX_INVALID (-1)
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typedef enum GIFDisposeMethod {
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GIF_DISPOSE_NONE,
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GIF_DISPOSE_BACKGROUND,
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GIF_DISPOSE_RESTORE_PREVIOUS
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} GIFDisposeMethod;
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typedef struct {
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int x_offset, y_offset, width, height;
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} GIFFrameRect;
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struct WebPData;
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struct WebPPicture;
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#ifndef WEBP_HAVE_GIF
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struct ColorMapObject;
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struct GifFileType;
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typedef unsigned char GifByteType;
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#endif
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// Given the index of background color and transparent color, returns the
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// corresponding background color (in BGRA format) in 'bgcolor'.
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void GIFGetBackgroundColor(const struct ColorMapObject* const color_map,
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int bgcolor_index, int transparent_index,
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uint32_t* const bgcolor);
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// Parses the given graphics extension data to get frame duration (in 1ms
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// units), dispose method and transparent color index.
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// Returns true on success.
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int GIFReadGraphicsExtension(const GifByteType* const buf, int* const duration,
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GIFDisposeMethod* const dispose,
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int* const transparent_index);
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// Reads the next GIF frame from 'gif' into 'picture'. Also, returns the GIF
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// frame dimensions and offsets in 'rect'.
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// Returns true on success.
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int GIFReadFrame(struct GifFileType* const gif, int transparent_index,
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GIFFrameRect* const gif_rect,
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struct WebPPicture* const picture);
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// Parses loop count from the given Netscape extension data.
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int GIFReadLoopCount(struct GifFileType* const gif, GifByteType** const buf,
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int* const loop_count);
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// Parses the given ICC or XMP extension data and stores it into 'metadata'.
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// Returns true on success.
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int GIFReadMetadata(struct GifFileType* const gif, GifByteType** const buf,
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struct WebPData* const metadata);
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// Dispose the pixels within 'rect' of 'curr_canvas' based on 'dispose' method
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// and 'prev_canvas'.
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void GIFDisposeFrame(GIFDisposeMethod dispose, const GIFFrameRect* const rect,
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const struct WebPPicture* const prev_canvas,
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struct WebPPicture* const curr_canvas);
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// Given 'src' picture and its frame rectangle 'rect', blend it into 'dst'.
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void GIFBlendFrames(const struct WebPPicture* const src,
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const GIFFrameRect* const rect,
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struct WebPPicture* const dst);
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// Prints an error string based on 'gif_error'.
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void GIFDisplayError(const struct GifFileType* const gif, int gif_error);
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// In the given 'pic', clear the pixels in 'rect' to transparent color.
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void GIFClearPic(struct WebPPicture* const pic, const GIFFrameRect* const rect);
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// Copy pixels from 'src' to 'dst' honoring strides. 'src' and 'dst' are assumed
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// to be already allocated.
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void GIFCopyPixels(const struct WebPPicture* const src,
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struct WebPPicture* const dst);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBP_EXAMPLES_GIFDEC_H_
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