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 "base/strings/stringprintf.h"
   8 #include "base/trace_event/trace_event_argument.h"
   9 #include "third_party/skia/include/core/SkCanvas.h"
  10 #include "third_party/skia/include/core/SkPaint.h"
  11 #include "third_party/skia/include/core/SkXfermode.h"
  12 #include "ui/gfx/skia_util.h"
  13
  14 namespace cc {
  15
  16 TransparencyDisplayItem::TransparencyDisplayItem(float opacity,
  17                                                  SkXfermode::Mode blend_mode)
  18     : opacity_(opacity), blend_mode_(blend_mode) {
  19 }
  20
  21 TransparencyDisplayItem::~TransparencyDisplayItem() {
  22 }
  23
  24 void TransparencyDisplayItem::Raster(SkCanvas* canvas,
  25                                      SkDrawPictureCallback* callback) const {
  26   SkPaint paint;
  27   paint.setXfermodeMode(blend_mode_);
  28   paint.setAlpha(opacity_ * 255);
  29   canvas->saveLayer(NULL, &paint);
  30 }
  31
  32 bool TransparencyDisplayItem::IsSuitableForGpuRasterization() const {
  33   return true;
  34 }
  35
  36 int TransparencyDisplayItem::ApproximateOpCount() const {
  37   return 1;
  38 }
  39
  40 size_t TransparencyDisplayItem::PictureMemoryUsage() const {
  41   return sizeof(float) + sizeof(SkXfermode::Mode);
  42 }
  43
  44 void TransparencyDisplayItem::AsValueInto(
  45     base::trace_event::TracedValue* array) const {
  46   array->AppendString(
  47       base::StringPrintf("TransparencyDisplayItem opacity: %f, blend_mode: %d",
  48                          opacity_, blend_mode_));
  49 }
  50
  51 EndTransparencyDisplayItem::EndTransparencyDisplayItem() {
  52 }
  53
  54 EndTransparencyDisplayItem::~EndTransparencyDisplayItem() {
  55 }
  56
  57 void EndTransparencyDisplayItem::Raster(SkCanvas* canvas,
  58                                         SkDrawPictureCallback* callback) const {
  59   canvas->restore();
  60 }
  61
  62 bool EndTransparencyDisplayItem::IsSuitableForGpuRasterization() const {
  63   return true;
  64 }
  65
  66 int EndTransparencyDisplayItem::ApproximateOpCount() const {
  67   return 0;
  68 }
  69
  70 size_t EndTransparencyDisplayItem::PictureMemoryUsage() const {
  71   return 0;
  72 }
  73
  74 void EndTransparencyDisplayItem::AsValueInto(
  75     base::trace_event::TracedValue* array) const {
  76   array->AppendString("EndTransparencyDisplayItem");
  77 }
  78
  79 }  // namespace cc