cc/resources/transparency_display_item.cc

   1 // Copyright 2014 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/resources/transparency_display_item.h"
   6
   7 #include "third_party/skia/include/core/SkCanvas.h"
   8 #include "third_party/skia/include/core/SkPaint.h"
   9 #include "third_party/skia/include/core/SkXfermode.h"
  10 #include "ui/gfx/skia_util.h"
  11
  12 namespace cc {
  13
  14 TransparencyDisplayItem::TransparencyDisplayItem(float opacity,
  15                                                  SkXfermode::Mode blend_mode)
  16     : opacity_(opacity), blend_mode_(blend_mode) {
  17 }
  18
  19 TransparencyDisplayItem::~TransparencyDisplayItem() {
  20 }
  21
  22 void TransparencyDisplayItem::Raster(SkCanvas* canvas,
  23                                      SkDrawPictureCallback* callback) const {
  24   SkPaint paint;
  25   paint.setXfermodeMode(blend_mode_);
  26   paint.setAlpha(opacity_ * 255);
  27   canvas->saveLayer(NULL, &paint);
  28 }
  29
  30 bool TransparencyDisplayItem::IsSuitableForGpuRasterization() const {
  31   return true;
  32 }
  33
  34 int TransparencyDisplayItem::ApproximateOpCount() const {
  35   return 1;
  36 }
  37
  38 size_t TransparencyDisplayItem::PictureMemoryUsage() const {
  39   return sizeof(float) + sizeof(SkXfermode::Mode);
  40 }
  41
  42 EndTransparencyDisplayItem::EndTransparencyDisplayItem() {
  43 }
  44
  45 EndTransparencyDisplayItem::~EndTransparencyDisplayItem() {
  46 }
  47
  48 void EndTransparencyDisplayItem::Raster(SkCanvas* canvas,
  49                                         SkDrawPictureCallback* callback) const {
  50   canvas->restore();
  51 }
  52
  53 bool EndTransparencyDisplayItem::IsSuitableForGpuRasterization() const {
  54   return true;
  55 }
  56
  57 int EndTransparencyDisplayItem::ApproximateOpCount() const {
  58   return 0;
  59 }
  60
  61 size_t EndTransparencyDisplayItem::PictureMemoryUsage() const {
  62   return 0;
  63 }
  64
  65 }  // namespace cc