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 "skia/ext/bitmap_platform_device_win.h"

 #include "skia/ext/bitmap_platform_device_data.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 skia {

 BitmapPlatformDevice::BitmapPlatformDeviceData::BitmapPlatformDeviceData(
     HBITMAP hbitmap)
     : bitmap_context_(hbitmap),
       hdc_(NULL),
       config_dirty_(true),  // Want to load the config next time.
       transform_(SkMatrix::I()) {
   // Initialize the clip region to the entire bitmap.
   BITMAP bitmap_data;
   if (GetObject(bitmap_context_, sizeof(BITMAP), &bitmap_data)) {
     SkIRect rect;
     rect.set(0, 0, bitmap_data.bmWidth, bitmap_data.bmHeight);
     clip_region_ = SkRegion(rect);
   }
 }

 BitmapPlatformDevice::BitmapPlatformDeviceData::~BitmapPlatformDeviceData() {
   if (hdc_)
     ReleaseBitmapDC();

   // this will free the bitmap data as well as the bitmap handle
   DeleteObject(bitmap_context_);
 }

 HDC BitmapPlatformDevice::BitmapPlatformDeviceData::GetBitmapDC() {
   if (!hdc_) {
     hdc_ = CreateCompatibleDC(NULL);
     InitializeDC(hdc_);
     HGDIOBJ old_bitmap = SelectObject(hdc_, bitmap_context_);
     // When the memory DC is created, its display surface is exactly one
     // monochrome pixel wide and one monochrome pixel high. Since we select our
     // own bitmap, we must delete the previous one.
     DeleteObject(old_bitmap);
   }

   LoadConfig();
   return hdc_;
 }

 void BitmapPlatformDevice::BitmapPlatformDeviceData::ReleaseBitmapDC() {
   SkASSERT(hdc_);
   DeleteDC(hdc_);
   hdc_ = NULL;
 }

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


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

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

   // Transform.
   LoadTransformToDC(hdc_, transform_);
   LoadClippingRegionToDC(hdc_, clip_region_, 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,
     HANDLE shared_section) {
   SkBitmap bitmap;

   // 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;

   void* data = NULL;
   HBITMAP hbitmap = CreateDIBSection(NULL,
                                      reinterpret_cast<BITMAPINFO*>(&hdr), 0,
                                      &data,
                                      shared_section, 0);
   if (!hbitmap) {
     return NULL;
   }

   bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
   bitmap.setPixels(data);
   bitmap.setIsOpaque(is_opaque);

 #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(new BitmapPlatformDeviceData(hbitmap),
                                   bitmap);
 }

 // static
 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
                                                    bool is_opaque) {
   return Create(width, height, is_opaque, NULL);
 }

 // static
 BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
                                                            int height,
                                                            bool is_opaque) {
   BitmapPlatformDevice* device = BitmapPlatformDevice::Create(width, height,
                                                               is_opaque);
   if (!is_opaque)
     device->accessBitmap(true).eraseARGB(0, 0, 0, 0);
   return device;
 }

 // The device will own the HBITMAP, which corresponds to also owning the pixel
 // data. Therefore, we do not transfer ownership to the SkDevice's bitmap.
 BitmapPlatformDevice::BitmapPlatformDevice(
     BitmapPlatformDeviceData* data,
     const SkBitmap& bitmap)
     : SkDevice(bitmap),
       data_(data) {
   // The data object is already ref'ed for us by create().
   SkDEBUGCODE(begin_paint_count_ = 0);
   SetPlatformDevice(this, this);
 }

 BitmapPlatformDevice::~BitmapPlatformDevice() {
   SkASSERT(begin_paint_count_ == 0);
   data_->unref();
 }

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

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

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

 void BitmapPlatformDevice::DrawToNativeContext(HDC dc, int x, int y,
                                                const RECT* src_rect) {
   bool created_dc = !data_->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, data_->transform());

   EndPlatformPaint();
   if (created_dc)
     data_->ReleaseBitmapDC();
 }

 const SkBitmap& BitmapPlatformDevice::onAccessBitmap(SkBitmap* bitmap) {
   // FIXME(brettw) OPTIMIZATION: We should only flush if we know a GDI
   // operation has occurred on our DC.
   if (data_->IsBitmapDCCreated())
     GdiFlush();
   return *bitmap;
 }

 SkDevice* BitmapPlatformDevice::onCreateCompatibleDevice(
     SkBitmap::Config config, int width, int height, bool isOpaque,
     Usage /*usage*/) {
   SkASSERT(config == SkBitmap::kARGB_8888_Config);
   SkDevice* bitmap_device = BitmapPlatformDevice::CreateAndClear(width, height,
                                                                  isOpaque);
   return bitmap_device;
 }

 }  // 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 "skia/ext/bitmap_platform_device_win.h"

	#include "skia/ext/bitmap_platform_device_data.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 skia {

	BitmapPlatformDevice::BitmapPlatformDeviceData::BitmapPlatformDeviceData(
	HBITMAP hbitmap)
	: bitmap_context_(hbitmap),
	hdc_(NULL),
	config_dirty_(true), // Want to load the config next time.
	transform_(SkMatrix::I()) {
	// Initialize the clip region to the entire bitmap.
	BITMAP bitmap_data;
	if (GetObject(bitmap_context_, sizeof(BITMAP), &bitmap_data)) {
	SkIRect rect;
	rect.set(0, 0, bitmap_data.bmWidth, bitmap_data.bmHeight);
	clip_region_ = SkRegion(rect);
	}
	}

	BitmapPlatformDevice::BitmapPlatformDeviceData::~BitmapPlatformDeviceData() {
	if (hdc_)
	ReleaseBitmapDC();

	// this will free the bitmap data as well as the bitmap handle
	DeleteObject(bitmap_context_);
	}

	HDC BitmapPlatformDevice::BitmapPlatformDeviceData::GetBitmapDC() {
	if (!hdc_) {
	hdc_ = CreateCompatibleDC(NULL);
	InitializeDC(hdc_);
	HGDIOBJ old_bitmap = SelectObject(hdc_, bitmap_context_);
	// When the memory DC is created, its display surface is exactly one
	// monochrome pixel wide and one monochrome pixel high. Since we select our
	// own bitmap, we must delete the previous one.
	DeleteObject(old_bitmap);
	}

	LoadConfig();
	return hdc_;
	}

	void BitmapPlatformDevice::BitmapPlatformDeviceData::ReleaseBitmapDC() {
	SkASSERT(hdc_);
	DeleteDC(hdc_);
	hdc_ = NULL;
	}

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


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

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

	// Transform.
	LoadTransformToDC(hdc_, transform_);
	LoadClippingRegionToDC(hdc_, clip_region_, 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,
	HANDLE shared_section) {
	SkBitmap bitmap;

	// 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;

	void* data = NULL;
	HBITMAP hbitmap = CreateDIBSection(NULL,
	reinterpret_cast<BITMAPINFO*>(&hdr), 0,
	&data,
	shared_section, 0);
	if (!hbitmap) {
	return NULL;
	}

	bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
	bitmap.setPixels(data);
	bitmap.setIsOpaque(is_opaque);

	#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(new BitmapPlatformDeviceData(hbitmap),
	bitmap);
	}

	// static
	BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
	bool is_opaque) {
	return Create(width, height, is_opaque, NULL);
	}

	// static
	BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
	int height,
	bool is_opaque) {
	BitmapPlatformDevice* device = BitmapPlatformDevice::Create(width, height,
	is_opaque);
	if (!is_opaque)
	device->accessBitmap(true).eraseARGB(0, 0, 0, 0);
	return device;
	}

	// The device will own the HBITMAP, which corresponds to also owning the pixel
	// data. Therefore, we do not transfer ownership to the SkDevice's bitmap.
	BitmapPlatformDevice::BitmapPlatformDevice(
	BitmapPlatformDeviceData* data,
	const SkBitmap& bitmap)
	: SkDevice(bitmap),
	data_(data) {
	// The data object is already ref'ed for us by create().
	SkDEBUGCODE(begin_paint_count_ = 0);
	SetPlatformDevice(this, this);
	}

	BitmapPlatformDevice::~BitmapPlatformDevice() {
	SkASSERT(begin_paint_count_ == 0);
	data_->unref();
	}

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

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

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

	void BitmapPlatformDevice::DrawToNativeContext(HDC dc, int x, int y,
	const RECT* src_rect) {
	bool created_dc = !data_->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, data_->transform());

	EndPlatformPaint();
	if (created_dc)
	data_->ReleaseBitmapDC();
	}

	const SkBitmap& BitmapPlatformDevice::onAccessBitmap(SkBitmap* bitmap) {
	// FIXME(brettw) OPTIMIZATION: We should only flush if we know a GDI
	// operation has occurred on our DC.
	if (data_->IsBitmapDCCreated())
	GdiFlush();
	return *bitmap;
	}

	SkDevice* BitmapPlatformDevice::onCreateCompatibleDevice(
	SkBitmap::Config config, int width, int height, bool isOpaque,
	Usage /usage/) {
	SkASSERT(config == SkBitmap::kARGB_8888_Config);
	SkDevice* bitmap_device = BitmapPlatformDevice::CreateAndClear(width, height,
	isOpaque);
	return bitmap_device;
	}

	} // namespace skia