skia WIPjarred/canvas

1 files changed, 179 insertions, 0 deletions

diff --git a/src/deps/skia/include/android/SkAnimatedImage.h b/src/deps/skia/include/android/SkAnimatedImage.h
new file mode 100644
index 000000000..8143c1722
--- /dev/null
+++ b/src/deps/skia/include/android/SkAnimatedImage.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright 2018 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkAnimatedImage_DEFINED
+#define SkAnimatedImage_DEFINED
+
+#include "include/codec/SkCodecAnimation.h"
+#include "include/core/SkBitmap.h"
+#include "include/core/SkDrawable.h"
+#include "include/core/SkMatrix.h"
+#include "include/core/SkRect.h"
+
+class SkAndroidCodec;
+class SkImage;
+class SkPicture;
+
+/**
+ *  Thread unsafe drawable for drawing animated images (e.g. GIF).
+ */
+class SK_API SkAnimatedImage : public SkDrawable {
+public:
+    /**
+     *  Create an SkAnimatedImage from the SkAndroidCodec.
+     *
+     *  Returns null on failure to allocate pixels. On success, this will
+     *  decode the first frame.
+     *
+     *  @param info Width and height may require scaling.
+     *  @param cropRect Rectangle to crop to after scaling.
+     *  @param postProcess Picture to apply after scaling and cropping.
+     */
+    static sk_sp<SkAnimatedImage> Make(std::unique_ptr<SkAndroidCodec>,
+            const SkImageInfo& info, SkIRect cropRect, sk_sp<SkPicture> postProcess);
+
+    /**
+     *  Simpler version that uses the default size, no cropping, and no postProcess.
+     */
+    static sk_sp<SkAnimatedImage> Make(std::unique_ptr<SkAndroidCodec>);
+
+    ~SkAnimatedImage() override;
+
+    /**
+     *  Reset the animation to the beginning.
+     */
+    void reset();
+
+    /**
+     *  Whether the animation completed.
+     *
+     *  Returns true after all repetitions are complete, or an error stops the
+     *  animation. Gets reset to false if the animation is restarted.
+     */
+    bool isFinished() const { return fFinished; }
+
+    /**
+     * Returned by decodeNextFrame and currentFrameDuration if the animation
+     * is not running.
+     */
+    static constexpr int kFinished = -1;
+
+    /**
+     *  Decode the next frame.
+     *
+     *  If the animation is on the last frame or has hit an error, returns
+     *  kFinished.
+     */
+    int decodeNextFrame();
+
+    /**
+     *  Returns the current frame as an SkImage. The SkImage will not change
+     *  after it has been returned.
+     *  If there is no current frame, nullptr will be returned.
+     */
+    sk_sp<SkImage> getCurrentFrame();
+
+    /**
+     *  How long to display the current frame.
+     *
+     *  Useful for the first frame, for which decodeNextFrame is called
+     *  internally.
+     */
+    int currentFrameDuration() {
+        return fCurrentFrameDuration;
+    }
+
+    /**
+     *  Change the repetition count.
+     *
+     *  By default, the image will repeat the number of times indicated in the
+     *  encoded data.
+     *
+     *  Use SkCodec::kRepetitionCountInfinite for infinite, and 0 to show all
+     *  frames once and then stop.
+     */
+    void setRepetitionCount(int count);
+
+    /**
+     *  Return the currently set repetition count.
+     */
+    int getRepetitionCount() const {
+        return fRepetitionCount;
+    }
+
+    /**
+     *  Return the total number of frames in the animation.
+     */
+    int getFrameCount() const { return fFrameCount; }
+
+protected:
+    SkRect onGetBounds() override;
+    void onDraw(SkCanvas*) override;
+
+private:
+    struct Frame {
+        SkBitmap fBitmap;
+        int      fIndex;
+        SkCodecAnimation::DisposalMethod fDisposalMethod;
+
+        // init() may have to create a new SkPixelRef, if the
+        // current one is already in use by another owner (e.g.
+        // an SkPicture). This determines whether to copy the
+        // existing one to the new one.
+        enum class OnInit {
+            // Restore the image from the old SkPixelRef to the
+            // new one.
+            kRestoreIfNecessary,
+            // No need to restore.
+            kNoRestore,
+        };
+
+        Frame();
+        bool init(const SkImageInfo& info, OnInit);
+        bool copyTo(Frame*) const;
+    };
+
+    std::unique_ptr<SkAndroidCodec> fCodec;
+          SkImageInfo               fDecodeInfo;
+    const SkIRect                   fCropRect;
+    const sk_sp<SkPicture>          fPostProcess;
+    const int                       fFrameCount;
+    SkMatrix                        fMatrix;
+    int                             fSampleSize;
+
+    bool                            fFinished;
+    int                             fCurrentFrameDuration;
+    Frame                           fDisplayFrame;
+    Frame                           fDecodingFrame;
+    Frame                           fRestoreFrame;
+    int                             fRepetitionCount;
+    int                             fRepetitionsCompleted;
+
+    SkAnimatedImage(std::unique_ptr<SkAndroidCodec>, const SkImageInfo& requestedInfo,
+            SkIRect cropRect, sk_sp<SkPicture> postProcess);
+
+    int computeNextFrame(int current, bool* animationEnded);
+    double finish();
+
+    /**
+     *  True if there is no crop, orientation, or post decoding scaling.
+     */
+    bool simple() const { return fMatrix.isIdentity() && !fPostProcess
+                                 && fCropRect == fDecodeInfo.bounds(); }
+
+    /**
+     *  Returns the current frame as an SkImage.
+     *
+     *  Like getCurrentFrame, but only returns the raw data from the internal SkBitmap. (i.e. no
+     *  scaling, orientation-correction or cropping.) If simple(), this is the final output.
+     */
+    sk_sp<SkImage> getCurrentFrameSimple();
+
+    using INHERITED = SkDrawable;
+};
+
+#endif // SkAnimatedImage_DEFINED