cc: Add image decode control in the compositor.

cc/playback/decoded_draw_image.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_PLAYBACK_DECODED_DRAW_IMAGE_H_
+#define CC_PLAYBACK_DECODED_DRAW_IMAGE_H_
+
+#include <cfloat>
+
+#include "third_party/skia/include/core/SkFilterQuality.h"
+#include "third_party/skia/include/core/SkImage.h"
+#include "third_party/skia/include/core/SkSize.h"
+
+namespace cc {
+
+class DecodedDrawImage {
+ public:
+  DecodedDrawImage(const SkImage* image,
+                   const SkSize& src_rect_offset,
+                   const SkSize& scale_adjustment,
+                   SkFilterQuality filter_quality)
+      : image_(image),
+        src_rect_offset_(src_rect_offset),
+        scale_adjustment_(scale_adjustment),
+        filter_quality_(filter_quality),
+        at_raster_decode_(false) {}
+
+  DecodedDrawImage(const SkImage* image, SkFilterQuality filter_quality)
+      : image_(image),
+        src_rect_offset_(SkSize::Make(0.f, 0.f)),
+        scale_adjustment_(SkSize::Make(1.f, 1.f)),
+        filter_quality_(filter_quality),
+        at_raster_decode_(false) {}
+
+  const SkImage* image() const { return image_; }
+  const SkSize& src_rect_offset() const { return src_rect_offset_; }
+  const SkSize& scale_adjustment() const { return scale_adjustment_; }
+  SkFilterQuality filter_quality() const { return filter_quality_; }
+  bool is_scale_adjustment_identity() const {
+    return std::abs(scale_adjustment_.width() - 1.f) < FLT_EPSILON &&
+           std::abs(scale_adjustment_.height() - 1.f) < FLT_EPSILON;
+  }
+
+  void set_at_raster_decode(bool at_raster_decode) {
+    at_raster_decode_ = at_raster_decode;
+  }
+  bool is_at_raster_decode() const { return at_raster_decode_; }
+
+ private:
+  const SkImage* image_;
+  const SkSize src_rect_offset_;
+  const SkSize scale_adjustment_;
+  const SkFilterQuality filter_quality_;
+  bool at_raster_decode_;
+};
+
+}  // namespace cc
+
+#endif  // CC_PLAYBACK_DECODED_DRAW_IMAGE_H_