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/playback/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     const LayerSettings& settings) {
  17   return make_scoped_refptr(new PictureImageLayer(settings));
  18 }
  19
  20 PictureImageLayer::PictureImageLayer(const LayerSettings& settings)
  21     : PictureLayer(settings, this) {
  22 }
  23
  24 PictureImageLayer::~PictureImageLayer() {
  25   ClearClient();
  26 }
  27
  28 scoped_ptr<LayerImpl> PictureImageLayer::CreateLayerImpl(
  29     LayerTreeImpl* tree_impl) {
  30   return PictureImageLayerImpl::Create(tree_impl, id(), is_mask());
  31 }
  32
  33 bool PictureImageLayer::HasDrawableContent() const {
  34   return !bitmap_.isNull() && PictureLayer::HasDrawableContent();
  35 }
  36
  37 void PictureImageLayer::SetBitmap(const SkBitmap& bitmap) {
  38   // SetBitmap() currently gets called whenever there is any
  39   // style change that affects the layer even if that change doesn't
  40   // affect the actual contents of the image (e.g. a CSS animation).
  41   // With this check in place we avoid unecessary texture uploads.
  42   if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef())
  43     return;
  44
  45   bitmap_ = bitmap;
  46   UpdateDrawsContent(HasDrawableContent());
  47   SetNeedsDisplay();
  48 }
  49
  50 void PictureImageLayer::PaintContents(
  51     SkCanvas* canvas,
  52     const gfx::Rect& clip,
  53     ContentLayerClient::PaintingControlSetting painting_control) {
  54   if (!bitmap_.width() || !bitmap_.height())
  55     return;
  56
  57   SkScalar content_to_layer_scale_x =
  58       SkFloatToScalar(static_cast<float>(bounds().width()) / bitmap_.width());
  59   SkScalar content_to_layer_scale_y =
  60       SkFloatToScalar(static_cast<float>(bounds().height()) / bitmap_.height());
  61   canvas->scale(content_to_layer_scale_x, content_to_layer_scale_y);
  62
  63   // Because Android WebView resourceless software draw mode rasters directly
  64   // to the root canvas, this draw must use the kSrcOver_Mode so that
  65   // transparent images blend correctly.
  66   canvas->drawBitmap(bitmap_, 0, 0);
  67 }
  68
  69 scoped_refptr<DisplayItemList> PictureImageLayer::PaintContentsToDisplayList(
  70     const gfx::Rect& clip,
  71     ContentLayerClient::PaintingControlSetting painting_control) {
  72   // Picture image layers can be used with GatherPixelRefs, so cached SkPictures
  73   // are currently required.
  74   const bool use_cached_picture = true;
  75   scoped_refptr<DisplayItemList> display_list =
  76       DisplayItemList::Create(clip, use_cached_picture);
  77
  78   SkPictureRecorder recorder;
  79   SkCanvas* canvas = recorder.beginRecording(gfx::RectToSkRect(clip));
  80   PaintContents(canvas, clip, painting_control);
  81
  82   skia::RefPtr<SkPicture> picture =
  83       skia::AdoptRef(recorder.endRecordingAsPicture());
  84   auto* item = display_list->CreateAndAppendItem<DrawingDisplayItem>();
  85   item->SetNew(picture.Pass());
  86
  87   display_list->Finalize();
  88   return display_list;
  89 }
  90
  91 bool PictureImageLayer::FillsBoundsCompletely() const {
  92   return false;
  93 }
  94
  95 }  // namespace cc