1 files changed, 84 insertions, 0 deletions
diff --git a/framesequence/jni/FrameSequence_gif.h b/framesequence/jni/FrameSequence_gif.h
new file mode 100644
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--- /dev/null
+++ b/framesequence/jni/FrameSequence_gif.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RASTERMILL_FRAMESQUENCE_GIF_H
+#define RASTERMILL_FRAMESQUENCE_GIF_H
+
+#include "config.h"
+#include "gif_lib.h"
+
+#include "Stream.h"
+#include "Color.h"
+#include "FrameSequence.h"
+
+class FrameSequence_gif : public FrameSequence {
+public:
+    FrameSequence_gif(Stream* stream);
+    virtual ~FrameSequence_gif();
+
+    virtual int getWidth() const {
+        return mGif ? mGif->SWidth : 0;
+    }
+
+    virtual int getHeight() const {
+        return mGif ? mGif->SHeight : 0;
+    }
+
+    virtual int getFrameCount() const {
+        return mGif ? mGif->ImageCount : 0;
+    }
+
+    virtual bool isOpaque() const {
+        return (mBgColor & COLOR_8888_ALPHA_MASK) == COLOR_8888_ALPHA_MASK;
+    }
+
+    virtual FrameSequenceState* createState() const;
+
+    GifFileType* getGif() const { return mGif; }
+    Color8888 getBackgroundColor() const { return mBgColor; }
+    bool getPreservedFrame(int frameIndex) const { return mPreservedFrames[frameIndex]; }
+    int getRestoringFrame(int frameIndex) const { return mRestoringFrames[frameIndex]; }
+
+private:
+    GifFileType* mGif;
+    Color8888 mBgColor;
+
+    // array of bool per frame - if true, frame data is used by a later DISPOSE_PREVIOUS frame
+    bool* mPreservedFrames;
+
+    // array of ints per frame - if >= 0, points to the index of the preserve that frame needs
+    int* mRestoringFrames;
+};
+
+class FrameSequenceState_gif : public FrameSequenceState {
+public:
+    FrameSequenceState_gif(const FrameSequence_gif& frameSequence);
+    virtual ~FrameSequenceState_gif();
+
+    // returns frame's delay time in ms
+    virtual long drawFrame(int frameNr,
+            Color8888* outputPtr, int outputPixelStride, int previousFrameNr);
+
+private:
+    void savePreserveBuffer(Color8888* outputPtr, int outputPixelStride, int frameNr);
+    void restorePreserveBuffer(Color8888* outputPtr, int outputPixelStride);
+
+    const FrameSequence_gif& mFrameSequence;
+    Color8888* mPreserveBuffer;
+    int mPreserveBufferFrame;
+};
+
+#endif //RASTERMILL_FRAMESQUENCE_GIF_H