github.com/cellofellow/gopkg@v0.0.0-20140722061823-eec0544a62ad/image/webp/libwebp/examples/gif2webp_util.h (about)

     1  // Copyright 2013 Google Inc. All Rights Reserved.
     2  //
     3  // Use of this source code is governed by a BSD-style license
     4  // that can be found in the COPYING file in the root of the source
     5  // tree. An additional intellectual property rights grant can be found
     6  // in the file PATENTS. All contributing project authors may
     7  // be found in the AUTHORS file in the root of the source tree.
     8  // -----------------------------------------------------------------------------
     9  //
    10  //  Helper structs and methods for gif2webp tool.
    11  //
    12  // Author: Urvang (urvang@google.com)
    13  
    14  #ifndef WEBP_EXAMPLES_GIF2WEBP_UTIL_H_
    15  #define WEBP_EXAMPLES_GIF2WEBP_UTIL_H_
    16  
    17  #include <stdlib.h>
    18  
    19  #include "webp/mux.h"
    20  
    21  #ifdef __cplusplus
    22  extern "C" {
    23  #endif
    24  
    25  //------------------------------------------------------------------------------
    26  // Helper utilities.
    27  
    28  #define WEBP_UTIL_TRANSPARENT_COLOR 0x00ffffff
    29  
    30  struct WebPPicture;
    31  
    32  typedef struct {
    33    int x_offset, y_offset, width, height;
    34  } WebPFrameRect;
    35  
    36  // Clear pixels in 'picture' within given 'rect' to transparent color.
    37  void WebPUtilClearPic(struct WebPPicture* const picture,
    38                        const WebPFrameRect* const rect);
    39  
    40  //------------------------------------------------------------------------------
    41  // Frame cache.
    42  
    43  typedef struct WebPFrameCache WebPFrameCache;
    44  
    45  // Given the minimum distance between key frames 'kmin' and maximum distance
    46  // between key frames 'kmax', returns an appropriately allocated cache object.
    47  // If 'allow_mixed' is true, the subsequent calls to WebPFrameCacheAddFrame()
    48  // will heuristically pick lossy or lossless compression for each frame.
    49  // Use WebPFrameCacheDelete() to deallocate the 'cache'.
    50  WebPFrameCache* WebPFrameCacheNew(int width, int height,
    51                                    size_t kmin, size_t kmax, int allow_mixed);
    52  
    53  // Release all the frame data from 'cache' and free 'cache'.
    54  void WebPFrameCacheDelete(WebPFrameCache* const cache);
    55  
    56  // Given an image described by 'frame', 'info' and 'orig_rect', optimize it for
    57  // WebP, encode it and add it to 'cache'.
    58  // This takes care of frame disposal too, according to 'info->dispose_method'.
    59  int WebPFrameCacheAddFrame(WebPFrameCache* const cache,
    60                             const WebPConfig* const config,
    61                             const WebPFrameRect* const orig_rect,
    62                             WebPPicture* const frame,
    63                             WebPMuxFrameInfo* const info);
    64  
    65  // Flush the *ready* frames from cache and add them to 'mux'. If 'verbose' is
    66  // true, prints the information about these frames.
    67  WebPMuxError WebPFrameCacheFlush(WebPFrameCache* const cache, int verbose,
    68                                   WebPMux* const mux);
    69  
    70  // Similar to 'WebPFrameCacheFlushFrames()', but flushes *all* the frames.
    71  WebPMuxError WebPFrameCacheFlushAll(WebPFrameCache* const cache, int verbose,
    72                                      WebPMux* const mux);
    73  
    74  //------------------------------------------------------------------------------
    75  
    76  #ifdef __cplusplus
    77  }    // extern "C"
    78  #endif
    79  
    80  #endif  // WEBP_EXAMPLES_GIF2WEBP_UTIL_H_