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// 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 "skia/ext/bitmap_platform_device_cairo.h"
#include "skia/ext/platform_canvas.h"
#if defined(OS_OPENBSD)
#include <cairo.h>
#else
#include <cairo/cairo.h>
#endif
namespace skia {
namespace {
void CairoSurfaceReleaseProc(void*, void* context) {
SkASSERT(context);
cairo_surface_destroy(static_cast<cairo_surface_t*>(context));
}
// Back the destination bitmap by a Cairo surface. The bitmap's
// pixelRef takes ownership of the passed-in surface and will call
// cairo_surface_destroy() upon destruction.
//
// Note: it may immediately destroy the surface, if it fails to create a bitmap
// with pixels, thus the caller must either ref() the surface before hand, or
// it must not refer to the surface after this call.
bool InstallCairoSurfacePixels(SkBitmap* dst,
cairo_surface_t* surface,
bool is_opaque) {
SkASSERT(dst);
if (!surface) {
return false;
}
SkImageInfo info
= SkImageInfo::MakeN32Premul(cairo_image_surface_get_width(surface),
cairo_image_surface_get_height(surface));
return dst->installPixels(info,
cairo_image_surface_get_data(surface),
cairo_image_surface_get_stride(surface),
NULL,
&CairoSurfaceReleaseProc,
static_cast<void*>(surface));
}
void LoadMatrixToContext(cairo_t* context, const SkMatrix& matrix) {
cairo_matrix_t cairo_matrix;
cairo_matrix_init(&cairo_matrix,
SkScalarToFloat(matrix.getScaleX()),
SkScalarToFloat(matrix.getSkewY()),
SkScalarToFloat(matrix.getSkewX()),
SkScalarToFloat(matrix.getScaleY()),
SkScalarToFloat(matrix.getTranslateX()),
SkScalarToFloat(matrix.getTranslateY()));
cairo_set_matrix(context, &cairo_matrix);
}
void LoadClipToContext(cairo_t* context, const SkRegion& clip) {
cairo_reset_clip(context);
// TODO(brettw) support non-rect clips.
SkIRect bounding = clip.getBounds();
cairo_rectangle(context, bounding.fLeft, bounding.fTop,
bounding.fRight - bounding.fLeft,
bounding.fBottom - bounding.fTop);
cairo_clip(context);
}
} // namespace
void BitmapPlatformDevice::SetMatrixClip(
const SkMatrix& transform,
const SkRegion& region) {
transform_ = transform;
clip_region_ = region;
config_dirty_ = true;
}
void BitmapPlatformDevice::LoadConfig() {
if (!config_dirty_ || !cairo_)
return; // Nothing to do.
config_dirty_ = false;
// Load the identity matrix since this is what our clip is relative to.
cairo_matrix_t cairo_matrix;
cairo_matrix_init_identity(&cairo_matrix);
cairo_set_matrix(cairo_, &cairo_matrix);
LoadClipToContext(cairo_, clip_region_);
LoadMatrixToContext(cairo_, transform_);
}
// 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) {
if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy(surface);
return NULL;
}
// must call this before trying to install the surface, since that may result
// in the surface being destroyed.
cairo_t* cairo = cairo_create(surface);
SkBitmap bitmap;
if (!InstallCairoSurfacePixels(&bitmap, surface, is_opaque)) {
cairo_destroy(cairo);
return NULL;
}
// The device object will take ownership of the graphics context.
return new BitmapPlatformDevice(bitmap, cairo);
}
BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
bool is_opaque) {
// This initializes the bitmap to all zeros.
cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
width, height);
BitmapPlatformDevice* device = Create(width, height, is_opaque, surface);
#ifndef NDEBUG
if (device && is_opaque) // Fill with bright bluish green
SkCanvas(device).drawColor(0xFF00FF80);
#endif
return device;
}
BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
int height,
bool is_opaque) {
// The Linux port always constructs initialized bitmaps, so there is no extra
// work to perform here.
return Create(width, height, is_opaque);
}
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);
}
// Ownership of the cairo object is transferred.
BitmapPlatformDevice::BitmapPlatformDevice(
const SkBitmap& bitmap,
cairo_t* cairo)
: SkBitmapDevice(bitmap),
cairo_(cairo),
config_dirty_(true),
transform_(SkMatrix::I()) { // Want to load the config next time.
SetPlatformDevice(this, this);
}
BitmapPlatformDevice::~BitmapPlatformDevice() {
cairo_destroy(cairo_);
}
SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& info,
const SkPaint*) {
SkASSERT(info.fInfo.colorType() == kN32_SkColorType);
return BitmapPlatformDevice::Create(info.fInfo.width(), info.fInfo.height(),
info.fInfo.isOpaque());
}
cairo_t* BitmapPlatformDevice::BeginPlatformPaint() {
LoadConfig();
cairo_surface_t* surface = cairo_get_target(cairo_);
// Tell cairo to flush anything it has pending.
cairo_surface_flush(surface);
// Tell Cairo that we (probably) modified (actually, will modify) its pixel
// buffer directly.
cairo_surface_mark_dirty(surface);
return cairo_;
}
void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
const SkRegion& region,
const SkClipStack&) {
SetMatrixClip(transform, region);
}
// PlatformCanvas impl
SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
uint8_t* data, OnFailureType failureType) {
skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
BitmapPlatformDevice::Create(width, height, is_opaque, data));
return CreateCanvas(dev, failureType);
}
// Port of PlatformBitmap to linux
PlatformBitmap::~PlatformBitmap() {
cairo_destroy(surface_);
}
bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
// The SkBitmap allocates and owns the bitmap memory; PlatformBitmap owns the
// cairo drawing context tied to the bitmap. The SkBitmap's pixelRef can
// outlive the PlatformBitmap if additional copies are made.
int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
cairo_surface_t* surf = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
width,
height);
if (cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS) {
cairo_surface_destroy(surf);
return false;
}
return InstallCairoSurfacePixels(&bitmap_, surf, is_opaque);
}
} // namespace skia
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