cc/layers/picture_image_layer.cc

   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(
  44     SkCanvas* canvas,
  45     const gfx::Rect& clip,
  46     gfx::RectF* opaque,
  47     ContentLayerClient::GraphicsContextStatus gc_status) {
  48   if (!bitmap_.width() || !bitmap_.height())
  49     return;
  50
  51   SkScalar content_to_layer_scale_x =
  52       SkFloatToScalar(static_cast<float>(bounds().width()) / bitmap_.width());
  53   SkScalar content_to_layer_scale_y =
  54       SkFloatToScalar(static_cast<float>(bounds().height()) / bitmap_.height());
  55   canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
  56
  57   // Because PictureImageLayer always FillsBoundsCompletely it will not clear
  58   // before painting on playback. As a result we must configure the paint to
  59   // copy over the uncleared destination, rather than blending with it.
  60   SkPaint paint;
  61   paint.setXfermodeMode(SkXfermode::kSrc_Mode);
  62   canvas->drawBitmap(bitmap_, 0, 0, &paint);
  63 }
  64
  65 bool PictureImageLayer::FillsBoundsCompletely() const {
  66   // PictureImageLayer will always paint to the entire layer bounds.
  67   return true;
  68 }
  69
  70 }  // namespace cc