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      1 // Copyright 2010 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "cc/layers/picture_image_layer.h"
      6 
      7 #include "cc/layers/picture_image_layer_impl.h"
      8 #include "third_party/skia/include/core/SkCanvas.h"
      9 
     10 namespace cc {
     11 
     12 scoped_refptr<PictureImageLayer> PictureImageLayer::Create() {
     13   return make_scoped_refptr(new PictureImageLayer());
     14 }
     15 
     16 PictureImageLayer::PictureImageLayer() : PictureLayer(this) {}
     17 
     18 PictureImageLayer::~PictureImageLayer() {
     19   ClearClient();
     20 }
     21 
     22 scoped_ptr<LayerImpl> PictureImageLayer::CreateLayerImpl(
     23     LayerTreeImpl* tree_impl) {
     24   return PictureImageLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
     25 }
     26 
     27 bool PictureImageLayer::DrawsContent() const {
     28   return !bitmap_.isNull() && PictureLayer::DrawsContent();
     29 }
     30 
     31 void PictureImageLayer::SetBitmap(const SkBitmap& bitmap) {
     32   // SetBitmap() currently gets called whenever there is any
     33   // style change that affects the layer even if that change doesn't
     34   // affect the actual contents of the image (e.g. a CSS animation).
     35   // With this check in place we avoid unecessary texture uploads.
     36   if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef())
     37     return;
     38 
     39   bitmap_ = bitmap;
     40   SetNeedsDisplay();
     41 }
     42 
     43 void PictureImageLayer::PaintContents(SkCanvas* canvas,
     44                                       gfx::Rect clip,
     45                                       gfx::RectF* opaque) {
     46   if (!bitmap_.width() || !bitmap_.height())
     47     return;
     48 
     49   SkScalar content_to_layer_scale_x =
     50       SkFloatToScalar(static_cast<float>(bounds().width()) / bitmap_.width());
     51   SkScalar content_to_layer_scale_y =
     52       SkFloatToScalar(static_cast<float>(bounds().height()) / bitmap_.height());
     53   canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
     54 
     55   canvas->drawBitmap(bitmap_, 0, 0);
     56 }
     57 
     58 }  // namespace cc
     59