Index: src/codec/SkCodecAnimation.h |
diff --git a/src/codec/SkCodecAnimation.h b/src/codec/SkCodecAnimation.h |
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+++ b/src/codec/SkCodecAnimation.h |
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+/* |
+ * Copyright 2016 Google Inc. |
+ * |
+ * Use of this source code is governed by a BSD-style license that can be |
+ * found in the LICENSE file. |
+ */ |
+ |
+/* |
+ * Copyright (C) 2015 Google Inc. All rights reserved. |
+ * |
+ * Redistribution and use in source and binary forms, with or without |
+ * modification, are permitted provided that the following conditions |
+ * are met: |
+ * 1. Redistributions of source code must retain the above copyright |
+ * notice, this list of conditions and the following disclaimer. |
+ * 2. Redistributions in binary form must reproduce the above copyright |
+ * notice, this list of conditions and the following disclaimer in the |
+ * documentation and/or other materials provided with the distribution. |
+ * |
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ */ |
+ |
+#ifndef SkCodecAnimation_DEFINED |
+#define SkCodecAnimation_DEFINED |
+ |
+#include "SkCodec.h" |
+#include "SkRect.h" |
+ |
+class SkCodecAnimation { |
+public: |
+ |
+ // GIF and WebP support animation. The explanation below is in terms of GIF, |
+ // but the same constants are used for WebP, too. |
+ // GIFs have an optional 16-bit unsigned loop count that describes how an |
+ // animated GIF should be cycled. If the loop count is absent, the animation |
+ // cycles once; if it is 0, the animation cycles infinitely; otherwise the |
+ // animation plays n + 1 cycles (where n is the specified loop count). If the |
+ // GIF decoder defaults to kAnimationLoopOnce in the absence of any loop count |
+ // and translates an explicit "0" loop count to kAnimationLoopInfinite, then we |
+ // get a couple of nice side effects: |
+ // * By making kAnimationLoopOnce be 0, we allow the animation cycling code to |
+ // avoid special-casing it, and simply treat all non-negative loop counts |
+ // identically. |
+ // * By making the other two constants negative, we avoid conflicts with any |
+ // real loop count values. |
+ static const int kAnimationLoopOnce = 0; |
+ static const int kAnimationLoopInfinite = -1; |
+ static const int kAnimationNone = -2; |
+ |
+ /** |
+ * This specifies how the next frame is based on this frame. |
+ * |
+ * Names are based on the GIF 89a spec. |
+ * |
+ * The numbers correspond to values in a GIF. |
+ */ |
+ enum DisposalMethod { |
+ /** |
+ * The next frame should be drawn on top of this one. |
+ * |
+ * In a GIF, a value of 0 (not specified) is also treated as Keep. |
+ */ |
+ Keep_DisposalMethod = 1, |
+ |
+ /** |
+ * Similar to Keep, except the area inside this frame's rectangle |
+ * should be cleared to the BackGround color (transparent) before |
+ * drawing the next frame. |
+ */ |
+ RestoreBGColor_DisposalMethod = 2, |
+ |
+ /** |
+ * The next frame should be drawn on top of the previous frame - i.e. |
+ * disregarding this one. |
+ * |
+ * In a GIF, a value of 4 is also treated as RestorePrevious. |
+ */ |
+ RestorePrevious_DisposalMethod = 3, |
+ }; |
+ |
+private: |
+ SkCodecAnimation(); |
+}; |
+#endif // SkCodecAnimation_DEFINED |