cc/resources/ui_resource_bitmap.cc

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/resources/ui_resource_bitmap.h"

#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkMallocPixelRef.h"
#include "third_party/skia/include/core/SkPixelRef.h"

namespace cc {
namespace {

UIResourceBitmap::UIResourceFormat SkColorTypeToUIResourceFormat(
    SkColorType sk_type) {
  UIResourceBitmap::UIResourceFormat format = UIResourceBitmap::RGBA8;
  switch (sk_type) {
    case kN32_SkColorType:
      format = UIResourceBitmap::RGBA8;
      break;
    case kAlpha_8_SkColorType:
      format = UIResourceBitmap::ALPHA_8;
      break;
    default:
      NOTREACHED() << "Invalid SkColorType for UIResourceBitmap: " << sk_type;
      break;
  }
  return format;
}

}  // namespace

void UIResourceBitmap::Create(const skia::RefPtr<SkPixelRef>& pixel_ref,
                              const gfx::Size& size,
                              UIResourceFormat format) {
  DCHECK(size.width());
  DCHECK(size.height());
  DCHECK(pixel_ref);
  DCHECK(pixel_ref->isImmutable());
  format_ = format;
  size_ = size;
  pixel_ref_ = pixel_ref;

  // Default values for secondary parameters.
  opaque_ = (format == ETC1);
}

UIResourceBitmap::UIResourceBitmap(const SkBitmap& skbitmap) {
  DCHECK_EQ(skbitmap.width(), skbitmap.rowBytesAsPixels());
  DCHECK(skbitmap.isImmutable());

  skia::RefPtr<SkPixelRef> pixel_ref = skia::SharePtr(skbitmap.pixelRef());
  const SkImageInfo& info = pixel_ref->info();
  Create(pixel_ref, gfx::Size(info.width(), info.height()),
         SkColorTypeToUIResourceFormat(skbitmap.colorType()));

  SetOpaque(skbitmap.isOpaque());
}

UIResourceBitmap::UIResourceBitmap(const gfx::Size& size, bool is_opaque) {
  SkAlphaType alphaType = is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
  SkImageInfo info =
      SkImageInfo::MakeN32(size.width(), size.height(), alphaType);
  skia::RefPtr<SkPixelRef> pixel_ref = skia::AdoptRef(
      SkMallocPixelRef::NewAllocate(info, info.minRowBytes(), NULL));
  pixel_ref->setImmutable();
  Create(pixel_ref, size, UIResourceBitmap::RGBA8);
  SetOpaque(is_opaque);
}

UIResourceBitmap::UIResourceBitmap(const skia::RefPtr<SkPixelRef>& pixel_ref,
                                   const gfx::Size& size) {
  Create(pixel_ref, size, UIResourceBitmap::ETC1);
}

UIResourceBitmap::~UIResourceBitmap() {}

AutoLockUIResourceBitmap::AutoLockUIResourceBitmap(
    const UIResourceBitmap& bitmap) : bitmap_(bitmap) {
  bitmap_.pixel_ref_->lockPixels();
}

AutoLockUIResourceBitmap::~AutoLockUIResourceBitmap() {
  bitmap_.pixel_ref_->unlockPixels();
}

const uint8_t* AutoLockUIResourceBitmap::GetPixels() const {
  return static_cast<const uint8_t*>(bitmap_.pixel_ref_->pixels());
}

}  // namespace cc