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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Flibwebp%2F'>libwebp</a>/<a href='?path=%2Fbig%2FSRC%2Flibwebp%2Fexamples%2F'>examples</a>/</p><hr><h3>✏️ Editing: gifdec.h</h3>  
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            <textarea name='content' rows='20'>// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// GIF decode.

#ifndef WEBP_EXAMPLES_GIFDEC_H_
#define WEBP_EXAMPLES_GIFDEC_H_

#include &lt;stdio.h&gt;

#include &quot;webp/types.h&quot;

#ifdef HAVE_CONFIG_H
#include &quot;webp/config.h&quot;
#endif

#ifdef WEBP_HAVE_GIF
#include &lt;gif_lib.h&gt;
#endif

#ifdef __cplusplus
extern &quot;C&quot; {
#endif

// GIFLIB_MAJOR is only defined in libgif &gt;= 4.2.0.
#if defined(GIFLIB_MAJOR) &amp;&amp; defined(GIFLIB_MINOR)
#define LOCAL_GIF_VERSION ((GIFLIB_MAJOR &lt;&lt; 8) | GIFLIB_MINOR)
#define LOCAL_GIF_PREREQ(maj, min) (LOCAL_GIF_VERSION &gt;= (((maj) &lt;&lt; 8) | (min)))
#else
#define LOCAL_GIF_VERSION 0
#define LOCAL_GIF_PREREQ(maj, min) 0
#endif

#define GIF_INDEX_INVALID (-1)

typedef enum GIFDisposeMethod {
  GIF_DISPOSE_NONE,
  GIF_DISPOSE_BACKGROUND,
  GIF_DISPOSE_RESTORE_PREVIOUS
} GIFDisposeMethod;

typedef struct {
  int x_offset, y_offset, width, height;
} GIFFrameRect;

struct WebPData;
struct WebPPicture;

#ifndef WEBP_HAVE_GIF
struct ColorMapObject;
struct GifFileType;
typedef unsigned char GifByteType;
#endif

// Given the index of background color and transparent color, returns the
// corresponding background color (in BGRA format) in &#039;bgcolor&#039;.
void GIFGetBackgroundColor(const struct ColorMapObject* const color_map,
                           int bgcolor_index, int transparent_index,
                           uint32_t* const bgcolor);

// Parses the given graphics extension data to get frame duration (in 1ms
// units), dispose method and transparent color index.
// Returns true on success.
int GIFReadGraphicsExtension(const GifByteType* const buf, int* const duration,
                             GIFDisposeMethod* const dispose,
                             int* const transparent_index);

// Reads the next GIF frame from &#039;gif&#039; into &#039;picture&#039;. Also, returns the GIF
// frame dimensions and offsets in &#039;rect&#039;.
// Returns true on success.
int GIFReadFrame(struct GifFileType* const gif, int transparent_index,
                 GIFFrameRect* const gif_rect,
                 struct WebPPicture* const picture);

// Parses loop count from the given Netscape extension data.
int GIFReadLoopCount(struct GifFileType* const gif, GifByteType** const buf,
                     int* const loop_count);

// Parses the given ICC or XMP extension data and stores it into &#039;metadata&#039;.
// Returns true on success.
int GIFReadMetadata(struct GifFileType* const gif, GifByteType** const buf,
                    struct WebPData* const metadata);

// Dispose the pixels within &#039;rect&#039; of &#039;curr_canvas&#039; based on &#039;dispose&#039; method
// and &#039;prev_canvas&#039;.
void GIFDisposeFrame(GIFDisposeMethod dispose, const GIFFrameRect* const rect,
                     const struct WebPPicture* const prev_canvas,
                     struct WebPPicture* const curr_canvas);

// Given &#039;src&#039; picture and its frame rectangle &#039;rect&#039;, blend it into &#039;dst&#039;.
void GIFBlendFrames(const struct WebPPicture* const src,
                    const GIFFrameRect* const rect,
                    struct WebPPicture* const dst);

// Prints an error string based on &#039;gif_error&#039;.
void GIFDisplayError(const struct GifFileType* const gif, int gif_error);

// In the given &#039;pic&#039;, clear the pixels in &#039;rect&#039; to transparent color.
void GIFClearPic(struct WebPPicture* const pic, const GIFFrameRect* const rect);

// Copy pixels from &#039;src&#039; to &#039;dst&#039; honoring strides. &#039;src&#039; and &#039;dst&#039; are assumed
// to be already allocated.
void GIFCopyPixels(const struct WebPPicture* const src,
                   struct WebPPicture* const dst);

#ifdef __cplusplus
}  // extern &quot;C&quot;
#endif

#endif  // WEBP_EXAMPLES_GIFDEC_H_
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