skia/ext/bitmap_platform_device_win.cc - chromium/src - Git at Google

 // 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/SkRefCnt.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkUtils.h"

 namespace {

 HBITMAP CreateHBitmap(int width, int height, bool is_opaque,
                              HANDLE shared_section, void** data) {
   // CreateDIBSection appears to get unhappy if we create an empty bitmap, so
   // just create a minimal bitmap
   if ((width == 0) || (height == 0)) {
     width = 1;
     height = 1;
   }

   BITMAPINFOHEADER hdr = {0};
   hdr.biSize = sizeof(BITMAPINFOHEADER);
   hdr.biWidth = width;
   hdr.biHeight = -height;  // minus means top-down bitmap
   hdr.biPlanes = 1;
   hdr.biBitCount = 32;
   hdr.biCompression = BI_RGB;  // no compression
   hdr.biSizeImage = 0;
   hdr.biXPelsPerMeter = 1;
   hdr.biYPelsPerMeter = 1;
   hdr.biClrUsed = 0;
   hdr.biClrImportant = 0;

   HBITMAP hbitmap = CreateDIBSection(NULL, reinterpret_cast<BITMAPINFO*>(&hdr),
                                      0, data, shared_section, 0);

 #if !defined(_WIN64)
   // If this call fails, we're gonna crash hard. Try to get some useful
   // information out before we crash for post-mortem analysis.
   if (!hbitmap)
     base::debug::GDIBitmapAllocFailure(&hdr, shared_section);
 #endif

   return hbitmap;
 }

 }  // namespace

 namespace skia {

 void DrawToNativeContext(SkCanvas* canvas, HDC hdc, int x, int y,
                          const RECT* src_rect) {
   PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
   if (platform_device)
     platform_device->DrawToHDC(hdc, x, y, src_rect);
 }

 void PlatformDevice::DrawToHDC(HDC, int x, int y, const RECT* src_rect) {}

 HDC BitmapPlatformDevice::GetBitmapDC() {
   if (!hdc_) {
     hdc_ = CreateCompatibleDC(NULL);
     InitializeDC(hdc_);
     old_hbitmap_ = static_cast<HBITMAP>(SelectObject(hdc_, hbitmap_));
   }

   LoadConfig();
   return hdc_;
 }

 void BitmapPlatformDevice::ReleaseBitmapDC() {
   SkASSERT(hdc_);
   SelectObject(hdc_, old_hbitmap_);
   DeleteDC(hdc_);
   hdc_ = NULL;
   old_hbitmap_ = NULL;
 }

 bool BitmapPlatformDevice::IsBitmapDCCreated()
     const {
   return hdc_ != NULL;
 }


 void BitmapPlatformDevice::SetMatrixClip(
     const SkMatrix& transform,
     const SkRegion& region) {
   transform_ = transform;
   clip_region_ = region;
   config_dirty_ = true;
 }

 void BitmapPlatformDevice::LoadConfig() {
   if (!config_dirty_ || !hdc_)
     return;  // Nothing to do.
   config_dirty_ = false;

   // Transform.
   LoadTransformToDC(hdc_, transform_);
   LoadClippingRegionToDC(hdc_, clip_region_, 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)
     DeleteObject(static_cast<HBITMAP>(context));
   else
     UnmapViewOfFile(addr);
 }

 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 = CreateHBitmap(width, height, is_opaque, shared_section, &data);
     if (!hbitmap)
       return NULL;
   } else {
     DCHECK(shared_section != NULL);
     data = MapViewOfFile(shared_section, FILE_MAP_WRITE, 0, 0,
                          PlatformCanvasStrideForWidth(width) * height);
     if (!data)
       return NULL;
   }

   SkBitmap bitmap;
   if (!InstallHBitmapPixels(&bitmap, width, height, is_opaque, data, hbitmap))
     return NULL;

   if (do_clear)
     bitmap.eraseColor(0);

 #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
 #endif

   // 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.
 BitmapPlatformDevice::BitmapPlatformDevice(
     HBITMAP hbitmap,
     const SkBitmap& bitmap)
     : SkBitmapDevice(bitmap),
       hbitmap_(hbitmap),
       old_hbitmap_(NULL),
       hdc_(NULL),
       config_dirty_(true),  // Want to load the config next time.
       transform_(SkMatrix::I()) {
   // The data object is already ref'ed for us by create().
   SkDEBUGCODE(begin_paint_count_ = 0);
   if (hbitmap) {
     SetPlatformDevice(this, this);
     // Initialize the clip region to the entire bitmap.
     BITMAP bitmap_data;
     if (GetObject(hbitmap_, sizeof(BITMAP), &bitmap_data)) {
       SkIRect rect;
       rect.set(0, 0, bitmap_data.bmWidth, bitmap_data.bmHeight);
       clip_region_ = SkRegion(rect);
     }
   }
 }

 BitmapPlatformDevice::~BitmapPlatformDevice() {
   SkASSERT(begin_paint_count_ == 0);
   if (hdc_)
     ReleaseBitmapDC();
 }

 HDC BitmapPlatformDevice::BeginPlatformPaint() {
   SkDEBUGCODE(begin_paint_count_++);
   return GetBitmapDC();
 }

 void BitmapPlatformDevice::EndPlatformPaint() {
   SkASSERT(begin_paint_count_--);
   PlatformDevice::EndPlatformPaint();
 }

 void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
                                          const SkRegion& region,
                                          const SkClipStack&) {
   SetMatrixClip(transform, region);
 }

 void BitmapPlatformDevice::DrawToHDC(HDC dc, int x, int y,
                                      const RECT* src_rect) {
   bool created_dc = !IsBitmapDCCreated();
   HDC source_dc = BeginPlatformPaint();

   RECT temp_rect;
   if (!src_rect) {
     temp_rect.left = 0;
     temp_rect.right = width();
     temp_rect.top = 0;
     temp_rect.bottom = height();
     src_rect = &temp_rect;
   }

   int copy_width = src_rect->right - src_rect->left;
   int copy_height = src_rect->bottom - src_rect->top;

   // We need to reset the translation for our bitmap or (0,0) won't be in the
   // upper left anymore
   SkMatrix identity;
   identity.reset();

   LoadTransformToDC(source_dc, identity);
   if (isOpaque()) {
     BitBlt(dc,
            x,
            y,
            copy_width,
            copy_height,
            source_dc,
            src_rect->left,
            src_rect->top,
            SRCCOPY);
   } else {
     SkASSERT(copy_width != 0 && copy_height != 0);
     BLENDFUNCTION blend_function = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
     GdiAlphaBlend(dc,
                   x,
                   y,
                   copy_width,
                   copy_height,
                   source_dc,
                   src_rect->left,
                   src_rect->top,
                   copy_width,
                   copy_height,
                   blend_function);
   }
   LoadTransformToDC(source_dc, transform_);

   EndPlatformPaint();
   if (created_dc)
     ReleaseBitmapDC();
 }

 const SkBitmap& BitmapPlatformDevice::onAccessBitmap() {
   // FIXME(brettw) OPTIMIZATION: We should only flush if we know a GDI
   // operation has occurred on our DC.
   if (IsBitmapDCCreated())
     GdiFlush();
   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) {
   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
       BitmapPlatformDevice::Create(width, height, is_opaque, shared_section));
   return CreateCanvas(dev, failureType);
 }

 }  // namespace skia
	// 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/SkRefCnt.h"
	#include "third_party/skia/include/core/SkRegion.h"
	#include "third_party/skia/include/core/SkUtils.h"

	namespace {

	HBITMAP CreateHBitmap(int width, int height, bool is_opaque,
	HANDLE shared_section, void** data) {
	// CreateDIBSection appears to get unhappy if we create an empty bitmap, so
	// just create a minimal bitmap
	if ((width == 0) \|\| (height == 0)) {
	width = 1;
	height = 1;
	}

	BITMAPINFOHEADER hdr = {0};
	hdr.biSize = sizeof(BITMAPINFOHEADER);
	hdr.biWidth = width;
	hdr.biHeight = -height; // minus means top-down bitmap
	hdr.biPlanes = 1;
	hdr.biBitCount = 32;
	hdr.biCompression = BI_RGB; // no compression
	hdr.biSizeImage = 0;
	hdr.biXPelsPerMeter = 1;
	hdr.biYPelsPerMeter = 1;
	hdr.biClrUsed = 0;
	hdr.biClrImportant = 0;

	HBITMAP hbitmap = CreateDIBSection(NULL, reinterpret_cast<BITMAPINFO*>(&hdr),
	0, data, shared_section, 0);

	#if !defined(_WIN64)
	// If this call fails, we're gonna crash hard. Try to get some useful
	// information out before we crash for post-mortem analysis.
	if (!hbitmap)
	base::debug::GDIBitmapAllocFailure(&hdr, shared_section);
	#endif

	return hbitmap;
	}

	} // namespace

	namespace skia {

	void DrawToNativeContext(SkCanvas* canvas, HDC hdc, int x, int y,
	const RECT* src_rect) {
	PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
	if (platform_device)
	platform_device->DrawToHDC(hdc, x, y, src_rect);
	}

	void PlatformDevice::DrawToHDC(HDC, int x, int y, const RECT* src_rect) {}

	HDC BitmapPlatformDevice::GetBitmapDC() {
	if (!hdc_) {
	hdc_ = CreateCompatibleDC(NULL);
	InitializeDC(hdc_);
	old_hbitmap_ = static_cast<HBITMAP>(SelectObject(hdc_, hbitmap_));
	}

	LoadConfig();
	return hdc_;
	}

	void BitmapPlatformDevice::ReleaseBitmapDC() {
	SkASSERT(hdc_);
	SelectObject(hdc_, old_hbitmap_);
	DeleteDC(hdc_);
	hdc_ = NULL;
	old_hbitmap_ = NULL;
	}

	bool BitmapPlatformDevice::IsBitmapDCCreated()
	const {
	return hdc_ != NULL;
	}


	void BitmapPlatformDevice::SetMatrixClip(
	const SkMatrix& transform,
	const SkRegion& region) {
	transform_ = transform;
	clip_region_ = region;
	config_dirty_ = true;
	}

	void BitmapPlatformDevice::LoadConfig() {
	if (!config_dirty_ \|\| !hdc_)
	return; // Nothing to do.
	config_dirty_ = false;

	// Transform.
	LoadTransformToDC(hdc_, transform_);
	LoadClippingRegionToDC(hdc_, clip_region_, 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)
	DeleteObject(static_cast<HBITMAP>(context));
	else
	UnmapViewOfFile(addr);
	}

	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 = CreateHBitmap(width, height, is_opaque, shared_section, &data);
	if (!hbitmap)
	return NULL;
	} else {
	DCHECK(shared_section != NULL);
	data = MapViewOfFile(shared_section, FILE_MAP_WRITE, 0, 0,
	PlatformCanvasStrideForWidth(width) * height);
	if (!data)
	return NULL;
	}

	SkBitmap bitmap;
	if (!InstallHBitmapPixels(&bitmap, width, height, is_opaque, data, hbitmap))
	return NULL;

	if (do_clear)
	bitmap.eraseColor(0);

	#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
	#endif

	// 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.
	BitmapPlatformDevice::BitmapPlatformDevice(
	HBITMAP hbitmap,
	const SkBitmap& bitmap)
	: SkBitmapDevice(bitmap),
	hbitmap_(hbitmap),
	old_hbitmap_(NULL),
	hdc_(NULL),
	config_dirty_(true), // Want to load the config next time.
	transform_(SkMatrix::I()) {
	// The data object is already ref'ed for us by create().
	SkDEBUGCODE(begin_paint_count_ = 0);
	if (hbitmap) {
	SetPlatformDevice(this, this);
	// Initialize the clip region to the entire bitmap.
	BITMAP bitmap_data;
	if (GetObject(hbitmap_, sizeof(BITMAP), &bitmap_data)) {
	SkIRect rect;
	rect.set(0, 0, bitmap_data.bmWidth, bitmap_data.bmHeight);
	clip_region_ = SkRegion(rect);
	}
	}
	}

	BitmapPlatformDevice::~BitmapPlatformDevice() {
	SkASSERT(begin_paint_count_ == 0);
	if (hdc_)
	ReleaseBitmapDC();
	}

	HDC BitmapPlatformDevice::BeginPlatformPaint() {
	SkDEBUGCODE(begin_paint_count_++);
	return GetBitmapDC();
	}

	void BitmapPlatformDevice::EndPlatformPaint() {
	SkASSERT(begin_paint_count_--);
	PlatformDevice::EndPlatformPaint();
	}

	void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
	const SkRegion& region,
	const SkClipStack&) {
	SetMatrixClip(transform, region);
	}

	void BitmapPlatformDevice::DrawToHDC(HDC dc, int x, int y,
	const RECT* src_rect) {
	bool created_dc = !IsBitmapDCCreated();
	HDC source_dc = BeginPlatformPaint();

	RECT temp_rect;
	if (!src_rect) {
	temp_rect.left = 0;
	temp_rect.right = width();
	temp_rect.top = 0;
	temp_rect.bottom = height();
	src_rect = &temp_rect;
	}

	int copy_width = src_rect->right - src_rect->left;
	int copy_height = src_rect->bottom - src_rect->top;

	// We need to reset the translation for our bitmap or (0,0) won't be in the
	// upper left anymore
	SkMatrix identity;
	identity.reset();

	LoadTransformToDC(source_dc, identity);
	if (isOpaque()) {
	BitBlt(dc,
	x,
	y,
	copy_width,
	copy_height,
	source_dc,
	src_rect->left,
	src_rect->top,
	SRCCOPY);
	} else {
	SkASSERT(copy_width != 0 && copy_height != 0);
	BLENDFUNCTION blend_function = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
	GdiAlphaBlend(dc,
	x,
	y,
	copy_width,
	copy_height,
	source_dc,
	src_rect->left,
	src_rect->top,
	copy_width,
	copy_height,
	blend_function);
	}
	LoadTransformToDC(source_dc, transform_);

	EndPlatformPaint();
	if (created_dc)
	ReleaseBitmapDC();
	}

	const SkBitmap& BitmapPlatformDevice::onAccessBitmap() {
	// FIXME(brettw) OPTIMIZATION: We should only flush if we know a GDI
	// operation has occurred on our DC.
	if (IsBitmapDCCreated())
	GdiFlush();
	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) {
	skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
	BitmapPlatformDevice::Create(width, height, is_opaque, shared_section));
	return CreateCanvas(dev, failureType);
	}

	} // namespace skia