Index: src/utils/SkBitmapRegionCanvas.h |
diff --git a/src/utils/SkBitmapRegionCanvas.h b/src/utils/SkBitmapRegionCanvas.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8de82a62b0c2a2f3b25b4b93fd3df161f703cc46 |
--- /dev/null |
+++ b/src/utils/SkBitmapRegionCanvas.h |
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+/* |
+ * Copyright 2015 Google Inc. |
+ * |
+ * Use of this source code is governed by a BSD-style license that can be |
+ * found in the LICENSE file. |
+ */ |
+ |
+#include "SkBitmap.h" |
+#include "SkBitmapRegionDecoder.h" |
+#include "SkScanlineDecoder.h" |
+ |
+/* |
+ * This class implements SkBitmapRegionDecoder using an SkScanlineDecoder and |
+ * an SkCanvas. It uses the scanline decoder to subset the height. It then |
+ * will subset the width and scale by drawing to an SkCanvas. |
+ */ |
+// FIXME (msarett): This implementation does not support WEBP, because WEBP |
+// does not have a scanline decoder. |
+class SkBitmapRegionCanvas : public SkBitmapRegionDecoder { |
+public: |
+ |
+ /* |
+ * Takes ownership of pointer to decoder |
+ */ |
+ SkBitmapRegionCanvas(SkScanlineDecoder* decoder); |
+ |
+ /* |
+ * Three differences from the Android version: |
+ * Returns a Skia bitmap instead of an Android bitmap. |
+ * Android version attempts to reuse a recycled bitmap. |
+ * Removed the options object and used parameters for color type and |
+ * sample size. |
+ */ |
+ SkBitmap* decodeRegion(int start_x, int start_y, int width, int height, |
+ int sampleSize, SkColorType prefColorType) override; |
+ |
+private: |
+ |
+ SkAutoTDelete<SkScanlineDecoder> fDecoder; |
+ |
+ typedef SkBitmapRegionDecoder INHERITED; |
+ |
+}; |