SkImageSource

Blink is migrating away from SkBitmaps, so we need an SkImage-based
SkImageFilter source.  This is pretty much a 1-1 equivalent of
SkBitmapSource.

To avoid duplication, relocate the SkImage deserialization logic
from SkPictureData to SkReadBuffer.

R=reed@google.com,robertphillips@google.com,senorblanco@chromium.org

Review URL: https://codereview.chromium.org/1343703005

1 files changed, 48 insertions, 0 deletions

diff --git a/include/effects/SkImageSource.h b/include/effects/SkImageSource.h
new file mode 100644
index 0000000000..56c6a6e96a
--- /dev/null
+++ b/include/effects/SkImageSource.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkImageSource_DEFINED
+#define SkImageSource_DEFINED
+
+#include "SkImageFilter.h"
+
+class SkImage;
+
+class SK_API SkImageSource : public SkImageFilter {
+public:
+    static SkImageFilter* Create(const SkImage*);
+    static SkImageFilter* Create(const SkImage*,
+                                 const SkRect& srcRect,
+                                 const SkRect& dstRect,
+                                 SkFilterQuality);
+
+    void computeFastBounds(const SkRect& src, SkRect* dst) const override;
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkImageSource)
+
+protected:
+    void flatten(SkWriteBuffer&) const override;
+
+    bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
+                       SkBitmap* result, SkIPoint* offset) const override;
+
+private:
+    explicit SkImageSource(const SkImage*);
+    SkImageSource(const SkImage*,
+                  const SkRect& srcRect,
+                  const SkRect& dstRect,
+                  SkFilterQuality);
+
+    SkAutoTUnref<const SkImage> fImage;
+    SkRect                      fSrcRect, fDstRect;
+    SkFilterQuality             fFilterQuality;
+
+    typedef SkImageFilter INHERITED;
+};
+
+#endif