blob: f126c6b2a074a61a2e2bd5b50154b5714b426762 [file] [log] [blame]
// Copyright (c) 2012 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 <windows.h>
#include <psapi.h>
#include <stddef.h>
#include "base/debug/gdi_debug_util_win.h"
#include "base/logging.h"
#include "base/win/win_util.h"
#include "skia/ext/bitmap_platform_device_win.h"
#include "skia/ext/platform_canvas.h"
#include "skia/ext/skia_utils_win.h"
#include "third_party/skia/include/core/SkMatrix.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/core/SkRect.h"
namespace {
void LoadClippingRegionToDC(HDC context,
const SkIRect& clip_bounds,
const SkMatrix& transformation) {
HRGN hrgn = CreateRectRgnIndirect(&skia::SkIRectToRECT(clip_bounds));
int result = SelectClipRgn(context, hrgn);
SkASSERT(result != ERROR);
result = DeleteObject(hrgn);
SkASSERT(result != 0);
} // namespace
namespace skia {
void DrawToNativeContext(SkCanvas* canvas, HDC destination_hdc, int x, int y,
const RECT* src_rect) {
ScopedPlatformPaint p(canvas);
RECT temp_rect;
if (!src_rect) {
temp_rect.left = 0;
temp_rect.right = canvas->imageInfo().width(); = 0;
temp_rect.bottom = canvas->imageInfo().height();
src_rect = &temp_rect;
skia::CopyHDC(p.GetPlatformSurface(), destination_hdc, x, y,
canvas->imageInfo().isOpaque(), *src_rect,
HDC BitmapPlatformDevice::GetBitmapDC(const SkMatrix& transform,
const SkIRect& clip_bounds) {
if (!hdc_) {
hdc_ = CreateCompatibleDC(NULL);
old_hbitmap_ = static_cast<HBITMAP>(SelectObject(hdc_, hbitmap_));
LoadConfig(transform, clip_bounds);
return hdc_;
void BitmapPlatformDevice::ReleaseBitmapDC() {
SelectObject(hdc_, old_hbitmap_);
hdc_ = NULL;
old_hbitmap_ = NULL;
bool BitmapPlatformDevice::IsBitmapDCCreated()
const {
return hdc_ != NULL;
void BitmapPlatformDevice::LoadConfig(const SkMatrix& transform,
const SkIRect& clip_bounds) {
if (!hdc_)
return; // Nothing to do.
// Transform.
skia::LoadTransformToDC(hdc_, transform);
LoadClippingRegionToDC(hdc_, clip_bounds, transform);
static void DeleteHBitmapCallback(void* addr, void* context) {
// If context is not NULL then it's a valid HBITMAP to delete.
// Otherwise we just unmap the pixel memory.
if (context)
static bool InstallHBitmapPixels(SkBitmap* bitmap, int width, int height,
bool is_opaque, void* data, HBITMAP hbitmap) {
const SkAlphaType at = is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
const SkImageInfo info = SkImageInfo::MakeN32(width, height, at);
const size_t rowBytes = info.minRowBytes();
SkColorTable* color_table = NULL;
return bitmap->installPixels(info, data, rowBytes, color_table,
DeleteHBitmapCallback, hbitmap);
// 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,
HANDLE shared_section,
bool do_clear) {
void* data;
HBITMAP hbitmap = NULL;
// This function contains an implementation of a Skia platform bitmap for
// drawing and compositing graphics. The original implementation uses Windows
// GDI to create the backing bitmap memory, however it's possible for a
// process to not have access to GDI which will cause this code to fail. It's
// possible to detect when GDI is unavailable and instead directly map the
// shared memory as the bitmap.
if (base::win::IsUser32AndGdi32Available()) {
hbitmap = skia::CreateHBitmap(width, height, is_opaque, shared_section,
if (!hbitmap) {
LOG(ERROR) << "CreateHBitmap failed";
return NULL;
} else {
DCHECK(shared_section != NULL);
data = MapViewOfFile(shared_section, FILE_MAP_WRITE, 0, 0,
PlatformCanvasStrideForWidth(width) * height);
if (!data) {
LOG(ERROR) << "MapViewOfFile failed";
return NULL;
SkBitmap bitmap;
if (!InstallHBitmapPixels(&bitmap, width, height, is_opaque, data, hbitmap)) {
LOG(ERROR) << "InstallHBitmapPixels failed";
return NULL;
if (do_clear)
#ifndef NDEBUG
// If we were given data, then don't clobber it!
if (!shared_section && is_opaque)
// To aid in finding bugs, we set the background color to something
// obviously wrong so it will be noticable when it is not cleared
bitmap.eraseARGB(255, 0, 255, 128); // bright bluish green
// The device object will take ownership of the HBITMAP. The initial refcount
// of the data object will be 1, which is what the constructor expects.
return new BitmapPlatformDevice(hbitmap, bitmap);
// static
BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
bool is_opaque) {
const HANDLE shared_section = NULL;
const bool do_clear = false;
return Create(width, height, is_opaque, shared_section, do_clear);
// The device will own the HBITMAP, which corresponds to also owning the pixel
// data. Therefore, we do not transfer ownership to the SkBitmapDevice's bitmap.
HBITMAP hbitmap,
const SkBitmap& bitmap)
: SkBitmapDevice(bitmap),
hdc_(NULL) {
// The data object is already ref'ed for us by create().
if (hbitmap) {
SetPlatformDevice(this, this);
BITMAP bitmap_data;
GetObject(hbitmap_, sizeof(BITMAP), &bitmap_data);
BitmapPlatformDevice::~BitmapPlatformDevice() {
if (hdc_)
HDC BitmapPlatformDevice::BeginPlatformPaint(const SkMatrix& transform,
const SkIRect& clip_bounds) {
return GetBitmapDC(transform, clip_bounds);
const SkBitmap& BitmapPlatformDevice::onAccessBitmap() {
// FIXME(brettw) OPTIMIZATION: We should only flush if we know a GDI
// operation has occurred on our DC.
if (IsBitmapDCCreated())
return SkBitmapDevice::onAccessBitmap();
SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& cinfo,
const SkPaint*) {
const SkImageInfo& info = cinfo.fInfo;
const bool do_clear = !info.isOpaque();
SkASSERT(info.colorType() == kN32_SkColorType);
return Create(info.width(), info.height(), info.isOpaque(), NULL, do_clear);
// PlatformCanvas impl
SkCanvas* CreatePlatformCanvas(int width,
int height,
bool is_opaque,
HANDLE shared_section,
OnFailureType failureType) {
sk_sp<SkBaseDevice> dev(
BitmapPlatformDevice::Create(width, height, is_opaque, shared_section));
return CreateCanvas(dev, failureType);
} // namespace skia