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 "cc/resources/drawing_display_item.h"
   9 #include "third_party/skia/include/core/SkCanvas.h"
  10 #include "third_party/skia/include/core/SkPictureRecorder.h"
  11 #include "ui/gfx/skia_util.h"
  12
  13 namespace cc {
  14
  15 scoped_refptr<PictureImageLayer> PictureImageLayer::Create() {
  16   return make_scoped_refptr(new PictureImageLayer());
  17 }
  18
  19 PictureImageLayer::PictureImageLayer() : PictureLayer(this) {}
  20
  21 PictureImageLayer::~PictureImageLayer() {
  22   ClearClient();
  23 }
  24
  25 scoped_ptr<LayerImpl> PictureImageLayer::CreateLayerImpl(
  26     LayerTreeImpl* tree_impl) {
  27   return PictureImageLayerImpl::Create(tree_impl, id(), is_mask());
  28 }
  29
  30 bool PictureImageLayer::HasDrawableContent() const {
  31   return !bitmap_.isNull() && PictureLayer::HasDrawableContent();
  32 }
  33
  34 void PictureImageLayer::SetBitmap(const SkBitmap& bitmap) {
  35   // SetBitmap() currently gets called whenever there is any
  36   // style change that affects the layer even if that change doesn't
  37   // affect the actual contents of the image (e.g. a CSS animation).
  38   // With this check in place we avoid unecessary texture uploads.
  39   if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef())
  40     return;
  41
  42   bitmap_ = bitmap;
  43   UpdateDrawsContent(HasDrawableContent());
  44   SetNeedsDisplay();
  45 }
  46
  47 void PictureImageLayer::PaintContents(
  48     SkCanvas* canvas,
  49     const gfx::Rect& clip,
  50     ContentLayerClient::PaintingControlSetting painting_control) {
  51   if (!bitmap_.width() || !bitmap_.height())
  52     return;
  53
  54   SkScalar content_to_layer_scale_x =
  55       SkFloatToScalar(static_cast<float>(bounds().width()) / bitmap_.width());
  56   SkScalar content_to_layer_scale_y =
  57       SkFloatToScalar(static_cast<float>(bounds().height()) / bitmap_.height());
  58   canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
  59
  60   // Because Android WebView resourceless software draw mode rasters directly
  61   // to the root canvas, this draw must use the kSrcOver_Mode so that
  62   // transparent images blend correctly.
  63   canvas->drawBitmap(bitmap_, 0, 0);
  64 }
  65
  66 scoped_refptr<DisplayItemList> PictureImageLayer::PaintContentsToDisplayList(
  67     const gfx::Rect& clip,
  68     ContentLayerClient::PaintingControlSetting painting_control) {
  69   scoped_refptr<DisplayItemList> display_item_list = DisplayItemList::Create();
  70
  71   SkPictureRecorder recorder;
  72   SkCanvas* canvas = recorder.beginRecording(gfx::RectToSkRect(clip));
  73   PaintContents(canvas, clip, painting_control);
  74
  75   skia::RefPtr<SkPicture> picture = skia::AdoptRef(recorder.endRecording());
  76   display_item_list->AppendItem(DrawingDisplayItem::Create(picture));
  77   return display_item_list;
  78 }
  79
  80 bool PictureImageLayer::FillsBoundsCompletely() const {
  81   return false;
  82 }
  83
  84 }  // namespace cc