cc/resources/ui_resource_bitmap.cc

   1 // Copyright 2013 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/ui_resource_bitmap.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "third_party/skia/include/core/SkBitmap.h"
  10 #include "third_party/skia/include/core/SkMallocPixelRef.h"
  11 #include "third_party/skia/include/core/SkPixelRef.h"
  12
  13 namespace cc {
  14 namespace {
  15
  16 UIResourceBitmap::UIResourceFormat SkColorTypeToUIResourceFormat(
  17     SkColorType sk_type) {
  18   UIResourceBitmap::UIResourceFormat format = UIResourceBitmap::RGBA8;
  19   switch (sk_type) {
  20     case kN32_SkColorType:
  21       format = UIResourceBitmap::RGBA8;
  22       break;
  23     case kAlpha_8_SkColorType:
  24       format = UIResourceBitmap::ALPHA_8;
  25       break;
  26     default:
  27       NOTREACHED() << "Invalid SkColorType for UIResourceBitmap: " << sk_type;
  28       break;
  29   }
  30   return format;
  31 }
  32
  33 }  // namespace
  34
  35 void UIResourceBitmap::Create(const skia::RefPtr<SkPixelRef>& pixel_ref,
  36                               const gfx::Size& size,
  37                               UIResourceFormat format) {
  38   DCHECK(size.width());
  39   DCHECK(size.height());
  40   DCHECK(pixel_ref);
  41   DCHECK(pixel_ref->isImmutable());
  42   format_ = format;
  43   size_ = size;
  44   pixel_ref_ = pixel_ref;
  45
  46   // Default values for secondary parameters.
  47   wrap_mode_ = CLAMP_TO_EDGE;
  48   opaque_ = (format == ETC1);
  49 }
  50
  51 UIResourceBitmap::UIResourceBitmap(const SkBitmap& skbitmap) {
  52   DCHECK_EQ(skbitmap.width(), skbitmap.rowBytesAsPixels());
  53   DCHECK(skbitmap.isImmutable());
  54
  55   skia::RefPtr<SkPixelRef> pixel_ref = skia::SharePtr(skbitmap.pixelRef());
  56   const SkImageInfo& info = pixel_ref->info();
  57   Create(pixel_ref, gfx::Size(info.width(), info.height()),
  58          SkColorTypeToUIResourceFormat(skbitmap.colorType()));
  59
  60   SetOpaque(skbitmap.isOpaque());
  61 }
  62
  63 UIResourceBitmap::UIResourceBitmap(const gfx::Size& size, bool is_opaque) {
  64   SkAlphaType alphaType = is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
  65   SkImageInfo info =
  66       SkImageInfo::MakeN32(size.width(), size.height(), alphaType);
  67   skia::RefPtr<SkPixelRef> pixel_ref = skia::AdoptRef(
  68       SkMallocPixelRef::NewAllocate(info, info.minRowBytes(), NULL));
  69   pixel_ref->setImmutable();
  70   Create(pixel_ref, size, UIResourceBitmap::RGBA8);
  71   SetOpaque(is_opaque);
  72 }
  73
  74 UIResourceBitmap::UIResourceBitmap(const skia::RefPtr<SkPixelRef>& pixel_ref,
  75                                    const gfx::Size& size) {
  76   Create(pixel_ref, size, UIResourceBitmap::ETC1);
  77 }
  78
  79 UIResourceBitmap::~UIResourceBitmap() {}
  80
  81 AutoLockUIResourceBitmap::AutoLockUIResourceBitmap(
  82     const UIResourceBitmap& bitmap) : bitmap_(bitmap) {
  83   bitmap_.pixel_ref_->lockPixels();
  84 }
  85
  86 AutoLockUIResourceBitmap::~AutoLockUIResourceBitmap() {
  87   bitmap_.pixel_ref_->unlockPixels();
  88 }
  89
  90 const uint8_t* AutoLockUIResourceBitmap::GetPixels() const {
  91   return static_cast<const uint8_t*>(bitmap_.pixel_ref_->pixels());
  92 }
  93
  94 }  // namespace cc