image/AnimationParams.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_image_AnimationParams_h
   8 #define mozilla_image_AnimationParams_h
   9
  10 #include <stdint.h>
  11 #include "mozilla/gfx/Rect.h"
  12 #include "FrameTimeout.h"
  13
  14 namespace mozilla {
  15 namespace image {
  16
  17 enum class BlendMethod : int8_t {
  18   // All color components of the frame, including alpha, overwrite the current
  19   // contents of the frame's output buffer region.
  20   SOURCE,
  21
  22   // The frame should be composited onto the output buffer based on its alpha,
  23   // using a simple OVER operation.
  24   OVER
  25 };
  26
  27 enum class DisposalMethod : int8_t {
  28   CLEAR_ALL = -1,   // Clear the whole image, revealing what's underneath.
  29   NOT_SPECIFIED,    // Leave the frame and let the new frame draw on top.
  30   KEEP,             // Leave the frame and let the new frame draw on top.
  31   CLEAR,            // Clear the frame's area, revealing what's underneath.
  32   RESTORE_PREVIOUS  // Restore the previous (composited) frame.
  33 };
  34
  35 struct AnimationParams {
  36   gfx::IntRect mBlendRect;
  37   FrameTimeout mTimeout;
  38   uint32_t mFrameNum;
  39   BlendMethod mBlendMethod;
  40   DisposalMethod mDisposalMethod;
  41 };
  42
  43 }  // namespace image
  44 }  // namespace mozilla
  45
  46 #endif  // mozilla_image_AnimationParams_h