blob: edb425e31057743cd7c485845a1add7d68b02e88 [file] [log] [blame]
// 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 <windows.h>
#include <psapi.h>
#include "skia/ext/platform_canvas_win.h"
#include "skia/ext/bitmap_platform_device_win.h"
namespace skia {
// Crash on failure.
#define CHECK(condition) if (!(condition)) __debugbreak();
// Crashes the process. This is called when a bitmap allocation fails, and this
// function tries to determine why it might have failed, and crash on different
// lines. This allows us to see in crash dumps the most likely reason for the
// failure. It takes the size of the bitmap we were trying to allocate as its
// arguments so we can check that as well.
void CrashForBitmapAllocationFailure(int w, int h) {
// The maximum number of GDI objects per process is 10K. If we're very close
// to that, it's probably the problem.
const int kLotsOfGDIObjs = 9990;
CHECK(GetGuiResources(GetCurrentProcess(), GR_GDIOBJECTS) < kLotsOfGDIObjs);
// If the bitmap is ginormous, then we probably can't allocate it.
// We use 64M pixels = 256MB @ 4 bytes per pixel.
const __int64 kGinormousBitmapPxl = 64000000;
CHECK(static_cast<__int64>(w) * static_cast<__int64>(h) <
// If we're using a crazy amount of virtual address space, then maybe there
// isn't enough for our bitmap.
const __int64 kLotsOfMem = 1500000000; // 1.5GB.
if (GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc)))
CHECK(pmc.PagefileUsage < kLotsOfMem);
// Everything else.
PlatformCanvasWin::PlatformCanvasWin() : SkCanvas() {
PlatformCanvasWin::PlatformCanvasWin(int width, int height, bool is_opaque)
: SkCanvas() {
bool initialized = initialize(width, height, is_opaque, NULL);
if (!initialized)
CrashForBitmapAllocationFailure(width, height);
PlatformCanvasWin::PlatformCanvasWin(int width,
int height,
bool is_opaque,
HANDLE shared_section)
: SkCanvas() {
bool initialized = initialize(width, height, is_opaque, shared_section);
if (!initialized)
CrashForBitmapAllocationFailure(width, height);
PlatformCanvasWin::~PlatformCanvasWin() {
bool PlatformCanvasWin::initialize(int width,
int height,
bool is_opaque,
HANDLE shared_section) {
SkDevice* device =
createPlatformDevice(width, height, is_opaque, shared_section);
if (!device)
return false;
device->unref(); // was created with refcount 1, and setDevice also refs
return true;
HDC PlatformCanvasWin::beginPlatformPaint() {
return getTopPlatformDevice().getBitmapDC();
void PlatformCanvasWin::endPlatformPaint() {
// we don't clear the DC here since it will be likely to be used again
// flushing will be done in onAccessBitmap
PlatformDeviceWin& PlatformCanvasWin::getTopPlatformDevice() const {
// All of our devices should be our special PlatformDevice.
SkCanvas::LayerIter iter(const_cast<PlatformCanvasWin*>(this), false);
return *static_cast<PlatformDeviceWin*>(iter.device());
SkDevice* PlatformCanvasWin::createDevice(SkBitmap::Config config,
int width,
int height,
bool is_opaque, bool isForLayer) {
SkASSERT(config == SkBitmap::kARGB_8888_Config);
return createPlatformDevice(width, height, is_opaque, NULL);
SkDevice* PlatformCanvasWin::createPlatformDevice(int width,
int height,
bool is_opaque,
HANDLE shared_section) {
HDC screen_dc = GetDC(NULL);
SkDevice* device = BitmapPlatformDeviceWin::create(screen_dc, width, height,
is_opaque, shared_section);
ReleaseDC(NULL, screen_dc);
return device;
SkDevice* PlatformCanvasWin::setBitmapDevice(const SkBitmap&) {
SkASSERT(false); // Should not be called.
return NULL;
} // namespace skia