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anim_util.h (2334B)

      1 // Copyright 2015 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 // Utilities for animated images
     11 
     12 #ifndef WEBP_EXAMPLES_ANIM_UTIL_H_
     13 #define WEBP_EXAMPLES_ANIM_UTIL_H_
     14 
     15 #ifdef HAVE_CONFIG_H
     16 #include "webp/config.h"
     17 #endif
     18 
     19 #include "webp/types.h"
     20 
     21 #ifdef __cplusplus
     22 extern "C" {
     23 #endif
     24 
     25 typedef enum {
     26   ANIM_GIF,
     27   ANIM_WEBP
     28 } AnimatedFileFormat;
     29 
     30 typedef struct {
     31   uint8_t* rgba;         // Decoded and reconstructed full frame.
     32   int duration;          // Frame duration in milliseconds.
     33   int is_key_frame;      // True if this frame is a key-frame.
     34 } DecodedFrame;
     35 
     36 typedef struct {
     37   AnimatedFileFormat format;
     38   uint32_t canvas_width;
     39   uint32_t canvas_height;
     40   uint32_t bgcolor;
     41   uint32_t loop_count;
     42   DecodedFrame* frames;
     43   uint32_t num_frames;
     44   void* raw_mem;
     45 } AnimatedImage;
     46 
     47 // Deallocate everything in 'image' (but not the object itself).
     48 void ClearAnimatedImage(AnimatedImage* const image);
     49 
     50 // Read animated image file into 'AnimatedImage' struct.
     51 // If 'dump_frames' is true, dump frames to 'dump_folder'.
     52 // Previous content of 'image' is obliterated.
     53 // Upon successful return, content of 'image' must be deleted by
     54 // calling 'ClearAnimatedImage'.
     55 int ReadAnimatedImage(const char filename[], AnimatedImage* const image,
     56                       int dump_frames, const char dump_folder[]);
     57 
     58 // Given two RGBA buffers, calculate max pixel difference and PSNR.
     59 // If 'premultiply' is true, R/G/B values will be pre-multiplied by the
     60 // transparency before comparison.
     61 void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
     62                     uint32_t width, uint32_t height, int premultiply,
     63                     int* const max_diff, double* const psnr);
     64 
     65 // Return library versions used by anim_util.
     66 void GetAnimatedImageVersions(int* const decoder_version,
     67                               int* const demux_version);
     68 
     69 #ifdef __cplusplus
     70 }    // extern "C"
     71 #endif
     72 
     73 #endif  // WEBP_EXAMPLES_ANIM_UTIL_H_