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,
  58          gfx::Size(info.fWidth, info.fHeight),
  59          SkColorTypeToUIResourceFormat(skbitmap.colorType()));
  60
  61   SetOpaque(skbitmap.isOpaque());
  62 }
  63
  64 UIResourceBitmap::UIResourceBitmap(const gfx::Size& size, bool is_opaque) {
  65   SkAlphaType alphaType = is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
  66   SkImageInfo info =
  67       SkImageInfo::MakeN32(size.width(), size.height(), alphaType);
  68   skia::RefPtr<SkPixelRef> pixel_ref = skia::AdoptRef(
  69       SkMallocPixelRef::NewAllocate(info, info.minRowBytes(), NULL));
  70   pixel_ref->setImmutable();
  71   Create(pixel_ref, size, UIResourceBitmap::RGBA8);
  72   SetOpaque(is_opaque);
  73 }
  74
  75 UIResourceBitmap::UIResourceBitmap(const skia::RefPtr<SkPixelRef>& pixel_ref,
  76                                    const gfx::Size& size) {
  77   Create(pixel_ref, size, UIResourceBitmap::ETC1);
  78 }
  79
  80 UIResourceBitmap::~UIResourceBitmap() {}
  81
  82 AutoLockUIResourceBitmap::AutoLockUIResourceBitmap(
  83     const UIResourceBitmap& bitmap) : bitmap_(bitmap) {
  84   bitmap_.pixel_ref_->lockPixels();
  85 }
  86
  87 AutoLockUIResourceBitmap::~AutoLockUIResourceBitmap() {
  88   bitmap_.pixel_ref_->unlockPixels();
  89 }
  90
  91 const uint8_t* AutoLockUIResourceBitmap::GetPixels() const {
  92   return static_cast<const uint8_t*>(bitmap_.pixel_ref_->pixels());
  93 }
  94
  95 }  // namespace cc