libwebp: upstream animation cherry-picks

third_party/libwebp/webp/mux_types.h

 // Copyright 2012 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.
 // -----------------------------------------------------------------------------
 //
 // Data-types common to the mux and demux libraries.
 //
 // Author: Urvang (urvang@google.com)
 
 #ifndef WEBP_WEBP_MUX_TYPES_H_
 #define WEBP_WEBP_MUX_TYPES_H_
 
 #include <stdlib.h>  // free()
 #include <string.h>  // memset()
 #include "./types.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)
 extern "C" {
 #endif
 
 // Note: forward declaring enumerations is not allowed in (strict) C and C++,
 // the types are left here for reference.
 // typedef enum WebPFeatureFlags WebPFeatureFlags;
 // typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
+// typedef enum WebPMuxAnimBlend WebPMuxAnimBlend;
 typedef struct WebPData WebPData;
 
 // VP8X Feature Flags.
 typedef enum WebPFeatureFlags {
   FRAGMENTS_FLAG  = 0x00000001,
   ANIMATION_FLAG  = 0x00000002,
   XMP_FLAG        = 0x00000004,
   EXIF_FLAG       = 0x00000008,
   ALPHA_FLAG      = 0x00000010,
   ICCP_FLAG       = 0x00000020
 } WebPFeatureFlags;
 
 // Dispose method (animation only). Indicates how the area used by the current
 // frame is to be treated before rendering the next frame on the canvas.
 typedef enum WebPMuxAnimDispose {
   WEBP_MUX_DISPOSE_NONE,       // Do not dispose.
   WEBP_MUX_DISPOSE_BACKGROUND  // Dispose to background color.
 } WebPMuxAnimDispose;
 
+// Blend operation (animation only). Indicates how transparent pixels of the
+// current frame are blended with those of the previous canvas.
+typedef enum WebPMuxAnimBlend {
+  WEBP_MUX_BLEND,              // Blend.
+  WEBP_MUX_NO_BLEND            // Do not blend.
+} WebPMuxAnimBlend;
+
 // Data type used to describe 'raw' data, e.g., chunk data
 // (ICC profile, metadata) and WebP compressed image data.
 struct WebPData {
   const uint8_t* bytes;
   size_t size;
 };
 
 // Initializes the contents of the 'webp_data' object with default values.
 static WEBP_INLINE void WebPDataInit(WebPData* webp_data) {
   if (webp_data != NULL) {
@@ skipping 22 matching lines @@
     dst->size = src->size;
   }
   return 1;
 }
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }    // extern "C"
 #endif
 
 #endif  /* WEBP_WEBP_MUX_TYPES_H_ */