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// Copyright (c) 2006-2008 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 "skia/ext/bitmap_platform_device_linux.h"
#include <cairo/cairo.h>
namespace skia {
// -----------------------------------------------------------------------------
// These objects are reference counted and own a Cairo surface. The surface is
// the backing store for a Skia bitmap and we reference count it so that we can
// copy BitmapPlatformDevice objects without having to copy all the image
// data.
// -----------------------------------------------------------------------------
class BitmapPlatformDevice::BitmapPlatformDeviceData
: public base::RefCounted<BitmapPlatformDeviceData> {
public:
explicit BitmapPlatformDeviceData(cairo_surface_t* surface)
: surface_(surface) { }
cairo_surface_t* surface() const { return surface_; }
protected:
cairo_surface_t *const surface_;
friend class base::RefCounted<BitmapPlatformDeviceData>;
~BitmapPlatformDeviceData() {
cairo_surface_destroy(surface_);
}
// Disallow copy & assign.
BitmapPlatformDeviceData(const BitmapPlatformDeviceData&);
BitmapPlatformDeviceData& operator=(
const BitmapPlatformDeviceData&);
};
// We use this static factory function instead of the regular constructor so
// that we can create the pixel data before calling the constructor. This is
// required so that we can call the base class' constructor with the pixel
// data.
BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
bool is_opaque,
cairo_surface_t* surface) {
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height,
cairo_image_surface_get_stride(surface));
bitmap.setPixels(cairo_image_surface_get_data(surface));
bitmap.setIsOpaque(is_opaque);
#ifndef NDEBUG
if (is_opaque) {
bitmap.eraseARGB(255, 0, 255, 128); // bright bluish green
}
#endif
// The device object will take ownership of the graphics context.
return new BitmapPlatformDevice
(bitmap, new BitmapPlatformDeviceData(surface));
}
BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
bool is_opaque) {
cairo_surface_t* surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
width, height);
return Create(width, height, is_opaque, surface);
}
BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
bool is_opaque,
uint8_t* data) {
cairo_surface_t* surface = cairo_image_surface_create_for_data(
data, CAIRO_FORMAT_ARGB32, width, height,
cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width));
return Create(width, height, is_opaque, surface);
}
// The device will own the bitmap, which corresponds to also owning the pixel
// data. Therefore, we do not transfer ownership to the SkDevice's bitmap.
BitmapPlatformDevice::BitmapPlatformDevice(
const SkBitmap& bitmap,
BitmapPlatformDeviceData* data)
: PlatformDevice(bitmap),
data_(data) {
}
BitmapPlatformDevice::BitmapPlatformDevice(
const BitmapPlatformDevice& other)
: PlatformDevice(const_cast<BitmapPlatformDevice&>(
other).accessBitmap(true)),
data_(other.data_) {
}
BitmapPlatformDevice::~BitmapPlatformDevice() {
}
cairo_surface_t* BitmapPlatformDevice::surface() const {
return data_->surface();
}
BitmapPlatformDevice& BitmapPlatformDevice::operator=(
const BitmapPlatformDevice& other) {
data_ = other.data_;
return *this;
}
} // namespace skia
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