Delete SkBitmapRegionCanvas

src/android/SkBitmapRegionCanvas.h

-/*
- * 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 "SkCodec.h"
-
-/*
- * This class implements SkBitmapRegionDecoder using an SkCodec 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: This class works well as a performance/quality comparison for
-//        SkBitmapRegionCodec, but it lacks several capabilities that are
-//        required by BitmapRegionDecoder in Android.
-//        (1) WEBP decodes - because SkWebpCodec does not have a scanline
-//            decoder.
-//        (2) Decodes to kGray8 and kIndex8.
-//        (3) Decodes to kUnpremul.
-//        (4) Correcting an invalid dstColorType.  For example, if the
-//            client requests kRGB_565 for a non-opaque image, rather than
-//            fail, we need to go ahead and decode to kN32.
-class SkBitmapRegionCanvas : public SkBitmapRegionDecoder {
-public:
-
-    /*
-     * Takes ownership of pointer to decoder
-     */
-    SkBitmapRegionCanvas(SkCodec* decoder);
-
-    bool decodeRegion(SkBitmap* bitmap, SkBRDAllocator* allocator,
-                      const SkIRect& desiredSubset, int sampleSize,
-                      SkColorType colorType, bool requireUnpremul) override;
-
-    bool conversionSupported(SkColorType colorType) override;
-
-    SkEncodedFormat getEncodedFormat() override { return fDecoder->getEncodedFormat(); }
-
-private:
-
-    SkAutoTDelete<SkCodec> fDecoder;
-
-    typedef SkBitmapRegionDecoder INHERITED;
-
-};