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Unified Diff: src/codec/SkCodecAnimation.h

Issue 2045293002: Add support for multiple frames in SkCodec (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Fix a test - we now draw transparent background for missing color table Created 4 years, 2 months ago
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Index: src/codec/SkCodecAnimation.h
diff --git a/src/codec/SkCodecAnimation.h b/src/codec/SkCodecAnimation.h
new file mode 100644
index 0000000000000000000000000000000000000000..d3fc5535147f999b06f2a167b0f433fc8e727256
--- /dev/null
+++ b/src/codec/SkCodecAnimation.h
@@ -0,0 +1,94 @@
+/*
+ * 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
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