WebCore/platform/graphics/skia/ImageBufferSkia.cpp - WebKit - Git at Google

 /*
  * Copyright (c) 2008, Google Inc. All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "ImageBuffer.h"

 #include "Base64.h"
 #include "BitmapImage.h"
 #include "BitmapImageSingleFrameSkia.h"
 #include "GraphicsContext.h"
 #include "ImageData.h"
 #include "PlatformContextSkia.h"
 #include "PNGImageEncoder.h"
 #include "SkColorPriv.h"
 #include "SkiaUtils.h"

 using namespace std;

 namespace WebCore {

 // We pass a technically-uninitialized canvas to the platform context here since
 // the canvas initialization completes in ImageBuffer::ImageBuffer. But
 // PlatformContext doesn't actually need to use the object, and this makes all
 // the ownership easier to manage.
 ImageBufferData::ImageBufferData(const IntSize& size)
     : m_platformContext(0)  // Canvas is set in ImageBuffer constructor.
 {
 }

 ImageBuffer::ImageBuffer(const IntSize& size, ImageColorSpace imageColorSpace, bool& success)
     : m_data(size)
     , m_size(size)
 {
     if (!m_data.m_canvas.initialize(size.width(), size.height(), false)) {
         success = false;
         return;
     }

     m_data.m_platformContext.setCanvas(&m_data.m_canvas);
     m_context.set(new GraphicsContext(&m_data.m_platformContext));
 #if PLATFORM(WIN_OS)
     m_context->platformContext()->setDrawingToImageBuffer(true);
 #endif

     // Make the background transparent. It would be nice if this wasn't
     // required, but the canvas is currently filled with the magic transparency
     // color. Can we have another way to manage this?
     m_data.m_canvas.drawARGB(0, 0, 0, 0, SkXfermode::kClear_Mode);
     success = true;
 }

 ImageBuffer::~ImageBuffer()
 {
 }

 GraphicsContext* ImageBuffer::context() const
 {
     return m_context.get();
 }

 Image* ImageBuffer::image() const
 {
     if (!m_image) {
         // This creates a COPY of the image and will cache that copy. This means
         // that if subsequent operations take place on the context, neither the
         // currently-returned image, nor the results of future image() calls,
         // will contain that operation.
         //
         // This seems silly, but is the way the CG port works: image() is
         // intended to be used only when rendering is "complete."
         m_image = BitmapImageSingleFrameSkia::create(
             *m_data.m_platformContext.bitmap());
     }
     return m_image.get();
 }

 void ImageBuffer::platformTransformColorSpace(const Vector<int>& lookUpTable)
 {
     const SkBitmap& bitmap = *context()->platformContext()->bitmap();
     if (bitmap.isNull())
         return;

     ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
     SkAutoLockPixels bitmapLock(bitmap);
     for (int y = 0; y < m_size.height(); ++y) {
         uint32_t* srcRow = bitmap.getAddr32(0, y);
         for (int x = 0; x < m_size.width(); ++x) {
             SkColor color = SkPMColorToColor(srcRow[x]);
             srcRow[x] = SkPreMultiplyARGB(SkColorGetA(color),
                                           lookUpTable[SkColorGetR(color)],
                                           lookUpTable[SkColorGetG(color)],
                                           lookUpTable[SkColorGetB(color)]);
         }
     }
 }

 template <Multiply multiplied>
 PassRefPtr<ImageData> getImageData(const IntRect& rect, const SkBitmap& bitmap,
                                    const IntSize& size)
 {
     RefPtr<ImageData> result = ImageData::create(rect.width(), rect.height());
     unsigned char* data = result->data()->data()->data();

     if (rect.x() < 0 || rect.y() < 0 ||
         (rect.x() + rect.width()) > size.width() ||
         (rect.y() + rect.height()) > size.height())
         memset(data, 0, result->data()->length());

     int originX = rect.x();
     int destX = 0;
     if (originX < 0) {
         destX = -originX;
         originX = 0;
     }
     int endX = rect.x() + rect.width();
     if (endX > size.width())
         endX = size.width();
     int numColumns = endX - originX;

     int originY = rect.y();
     int destY = 0;
     if (originY < 0) {
         destY = -originY;
         originY = 0;
     }
     int endY = rect.y() + rect.height();
     if (endY > size.height())
         endY = size.height();
     int numRows = endY - originY;

     ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
     SkAutoLockPixels bitmapLock(bitmap);

     unsigned destBytesPerRow = 4 * rect.width();
     unsigned char* destRow = data + destY * destBytesPerRow + destX * 4;

     for (int y = 0; y < numRows; ++y) {
         uint32_t* srcRow = bitmap.getAddr32(originX, originY + y);
         for (int x = 0; x < numColumns; ++x) {
             unsigned char* destPixel = &destRow[x * 4];
             if (multiplied == Unmultiplied) {
                 SkColor color = srcRow[x];
                 unsigned a = SkColorGetA(color);
                 destPixel[0] = a ? SkColorGetR(color) * 255 / a : 0;
                 destPixel[1] = a ? SkColorGetG(color) * 255 / a : 0;
                 destPixel[2] = a ? SkColorGetB(color) * 255 / a : 0;
                 destPixel[3] = a;
             } else {
                 // Input and output are both pre-multiplied, we just need to re-arrange the
                 // bytes from the bitmap format to RGBA.
                 destPixel[0] = SkGetPackedR32(srcRow[x]);
                 destPixel[1] = SkGetPackedG32(srcRow[x]);
                 destPixel[2] = SkGetPackedB32(srcRow[x]);
                 destPixel[3] = SkGetPackedA32(srcRow[x]);
             }
         }
         destRow += destBytesPerRow;
     }

     return result;
 }

 PassRefPtr<ImageData> ImageBuffer::getUnmultipliedImageData(const IntRect& rect) const
 {
     return getImageData<Unmultiplied>(rect, *context()->platformContext()->bitmap(), m_size);
 }

 PassRefPtr<ImageData> ImageBuffer::getPremultipliedImageData(const IntRect& rect) const
 {
     return getImageData<Premultiplied>(rect, *context()->platformContext()->bitmap(), m_size);
 }

 template <Multiply multiplied>
 void putImageData(ImageData*& source, const IntRect& sourceRect, const IntPoint& destPoint,
                   const SkBitmap& bitmap, const IntSize& size)
 {
     ASSERT(sourceRect.width() > 0);
     ASSERT(sourceRect.height() > 0);

     int originX = sourceRect.x();
     int destX = destPoint.x() + sourceRect.x();
     ASSERT(destX >= 0);
     ASSERT(destX < size.width());
     ASSERT(originX >= 0);
     ASSERT(originX < sourceRect.right());

     int endX = destPoint.x() + sourceRect.right();
     ASSERT(endX <= size.width());

     int numColumns = endX - destX;

     int originY = sourceRect.y();
     int destY = destPoint.y() + sourceRect.y();
     ASSERT(destY >= 0);
     ASSERT(destY < size.height());
     ASSERT(originY >= 0);
     ASSERT(originY < sourceRect.bottom());

     int endY = destPoint.y() + sourceRect.bottom();
     ASSERT(endY <= size.height());
     int numRows = endY - destY;

     ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
     SkAutoLockPixels bitmapLock(bitmap);

     unsigned srcBytesPerRow = 4 * source->width();

     const unsigned char* srcRow = source->data()->data()->data() + originY * srcBytesPerRow + originX * 4;

     for (int y = 0; y < numRows; ++y) {
         uint32_t* destRow = bitmap.getAddr32(destX, destY + y);
         for (int x = 0; x < numColumns; ++x) {
             const unsigned char* srcPixel = &srcRow[x * 4];
             if (multiplied == Unmultiplied)
                 destRow[x] = SkPreMultiplyARGB(srcPixel[3], srcPixel[0],
                                                srcPixel[1], srcPixel[2]);
             else
                 destRow[x] = SkPackARGB32(srcPixel[3], srcPixel[0],
                                           srcPixel[1], srcPixel[2]);
         }
         srcRow += srcBytesPerRow;
     }
 }

 void ImageBuffer::putUnmultipliedImageData(ImageData* source, const IntRect& sourceRect, const IntPoint& destPoint)
 {
     putImageData<Unmultiplied>(source, sourceRect, destPoint, *context()->platformContext()->bitmap(), m_size);
 }

 void ImageBuffer::putPremultipliedImageData(ImageData* source, const IntRect& sourceRect, const IntPoint& destPoint)
 {
     putImageData<Premultiplied>(source, sourceRect, destPoint, *context()->platformContext()->bitmap(), m_size);
 }

 String ImageBuffer::toDataURL(const String&) const
 {
     // Encode the image into a vector.
     Vector<unsigned char> pngEncodedData;
     PNGImageEncoder::encode(*context()->platformContext()->bitmap(), &pngEncodedData);

     // Convert it into base64.
     Vector<char> base64EncodedData;
     base64Encode(*reinterpret_cast<Vector<char>*>(&pngEncodedData), base64EncodedData);
     // Append with a \0 so that it's a valid string.
     base64EncodedData.append('\0');

     // And the resulting string.
     return String::format("data:image/png;base64,%s", base64EncodedData.data());
 }

 } // namespace WebCore
	/*
	* Copyright (c) 2008, Google Inc. All rights reserved.
	* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "ImageBuffer.h"

	#include "Base64.h"
	#include "BitmapImage.h"
	#include "BitmapImageSingleFrameSkia.h"
	#include "GraphicsContext.h"
	#include "ImageData.h"
	#include "PlatformContextSkia.h"
	#include "PNGImageEncoder.h"
	#include "SkColorPriv.h"
	#include "SkiaUtils.h"

	using namespace std;

	namespace WebCore {

	// We pass a technically-uninitialized canvas to the platform context here since
	// the canvas initialization completes in ImageBuffer::ImageBuffer. But
	// PlatformContext doesn't actually need to use the object, and this makes all
	// the ownership easier to manage.
	ImageBufferData::ImageBufferData(const IntSize& size)
	: m_platformContext(0) // Canvas is set in ImageBuffer constructor.
	{
	}

	ImageBuffer::ImageBuffer(const IntSize& size, ImageColorSpace imageColorSpace, bool& success)
	: m_data(size)
	, m_size(size)
	{
	if (!m_data.m_canvas.initialize(size.width(), size.height(), false)) {
	success = false;
	return;
	}

	m_data.m_platformContext.setCanvas(&m_data.m_canvas);
	m_context.set(new GraphicsContext(&m_data.m_platformContext));
	#if PLATFORM(WIN_OS)
	m_context->platformContext()->setDrawingToImageBuffer(true);
	#endif

	// Make the background transparent. It would be nice if this wasn't
	// required, but the canvas is currently filled with the magic transparency
	// color. Can we have another way to manage this?
	m_data.m_canvas.drawARGB(0, 0, 0, 0, SkXfermode::kClear_Mode);
	success = true;
	}

	ImageBuffer::~ImageBuffer()
	{
	}

	GraphicsContext* ImageBuffer::context() const
	{
	return m_context.get();
	}

	Image* ImageBuffer::image() const
	{
	if (!m_image) {
	// This creates a COPY of the image and will cache that copy. This means
	// that if subsequent operations take place on the context, neither the
	// currently-returned image, nor the results of future image() calls,
	// will contain that operation.
	//
	// This seems silly, but is the way the CG port works: image() is
	// intended to be used only when rendering is "complete."
	m_image = BitmapImageSingleFrameSkia::create(
	*m_data.m_platformContext.bitmap());
	}
	return m_image.get();
	}

	void ImageBuffer::platformTransformColorSpace(const Vector<int>& lookUpTable)
	{
	const SkBitmap& bitmap = *context()->platformContext()->bitmap();
	if (bitmap.isNull())
	return;

	ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
	SkAutoLockPixels bitmapLock(bitmap);
	for (int y = 0; y < m_size.height(); ++y) {
	uint32_t* srcRow = bitmap.getAddr32(0, y);
	for (int x = 0; x < m_size.width(); ++x) {
	SkColor color = SkPMColorToColor(srcRow[x]);
	srcRow[x] = SkPreMultiplyARGB(SkColorGetA(color),
	lookUpTable[SkColorGetR(color)],
	lookUpTable[SkColorGetG(color)],
	lookUpTable[SkColorGetB(color)]);
	}
	}
	}

	template <Multiply multiplied>
	PassRefPtr<ImageData> getImageData(const IntRect& rect, const SkBitmap& bitmap,
	const IntSize& size)
	{
	RefPtr<ImageData> result = ImageData::create(rect.width(), rect.height());
	unsigned char* data = result->data()->data()->data();

	if (rect.x() < 0 \|\| rect.y() < 0 \|\|
	(rect.x() + rect.width()) > size.width() \|\|
	(rect.y() + rect.height()) > size.height())
	memset(data, 0, result->data()->length());

	int originX = rect.x();
	int destX = 0;
	if (originX < 0) {
	destX = -originX;
	originX = 0;
	}
	int endX = rect.x() + rect.width();
	if (endX > size.width())
	endX = size.width();
	int numColumns = endX - originX;

	int originY = rect.y();
	int destY = 0;
	if (originY < 0) {
	destY = -originY;
	originY = 0;
	}
	int endY = rect.y() + rect.height();
	if (endY > size.height())
	endY = size.height();
	int numRows = endY - originY;

	ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
	SkAutoLockPixels bitmapLock(bitmap);

	unsigned destBytesPerRow = 4 * rect.width();
	unsigned char* destRow = data + destY * destBytesPerRow + destX * 4;

	for (int y = 0; y < numRows; ++y) {
	uint32_t* srcRow = bitmap.getAddr32(originX, originY + y);
	for (int x = 0; x < numColumns; ++x) {
	unsigned char* destPixel = &destRow[x * 4];
	if (multiplied == Unmultiplied) {
	SkColor color = srcRow[x];
	unsigned a = SkColorGetA(color);
	destPixel[0] = a ? SkColorGetR(color) * 255 / a : 0;
	destPixel[1] = a ? SkColorGetG(color) * 255 / a : 0;
	destPixel[2] = a ? SkColorGetB(color) * 255 / a : 0;
	destPixel[3] = a;
	} else {
	// Input and output are both pre-multiplied, we just need to re-arrange the
	// bytes from the bitmap format to RGBA.
	destPixel[0] = SkGetPackedR32(srcRow[x]);
	destPixel[1] = SkGetPackedG32(srcRow[x]);
	destPixel[2] = SkGetPackedB32(srcRow[x]);
	destPixel[3] = SkGetPackedA32(srcRow[x]);
	}
	}
	destRow += destBytesPerRow;
	}

	return result;
	}

	PassRefPtr<ImageData> ImageBuffer::getUnmultipliedImageData(const IntRect& rect) const
	{
	return getImageData<Unmultiplied>(rect, *context()->platformContext()->bitmap(), m_size);
	}

	PassRefPtr<ImageData> ImageBuffer::getPremultipliedImageData(const IntRect& rect) const
	{
	return getImageData<Premultiplied>(rect, *context()->platformContext()->bitmap(), m_size);
	}

	template <Multiply multiplied>
	void putImageData(ImageData*& source, const IntRect& sourceRect, const IntPoint& destPoint,
	const SkBitmap& bitmap, const IntSize& size)
	{
	ASSERT(sourceRect.width() > 0);
	ASSERT(sourceRect.height() > 0);

	int originX = sourceRect.x();
	int destX = destPoint.x() + sourceRect.x();
	ASSERT(destX >= 0);
	ASSERT(destX < size.width());
	ASSERT(originX >= 0);
	ASSERT(originX < sourceRect.right());

	int endX = destPoint.x() + sourceRect.right();
	ASSERT(endX <= size.width());

	int numColumns = endX - destX;

	int originY = sourceRect.y();
	int destY = destPoint.y() + sourceRect.y();
	ASSERT(destY >= 0);
	ASSERT(destY < size.height());
	ASSERT(originY >= 0);
	ASSERT(originY < sourceRect.bottom());

	int endY = destPoint.y() + sourceRect.bottom();
	ASSERT(endY <= size.height());
	int numRows = endY - destY;

	ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
	SkAutoLockPixels bitmapLock(bitmap);

	unsigned srcBytesPerRow = 4 * source->width();

	const unsigned char* srcRow = source->data()->data()->data() + originY * srcBytesPerRow + originX * 4;

	for (int y = 0; y < numRows; ++y) {
	uint32_t* destRow = bitmap.getAddr32(destX, destY + y);
	for (int x = 0; x < numColumns; ++x) {
	const unsigned char* srcPixel = &srcRow[x * 4];
	if (multiplied == Unmultiplied)
	destRow[x] = SkPreMultiplyARGB(srcPixel[3], srcPixel[0],
	srcPixel[1], srcPixel[2]);
	else
	destRow[x] = SkPackARGB32(srcPixel[3], srcPixel[0],
	srcPixel[1], srcPixel[2]);
	}
	srcRow += srcBytesPerRow;
	}
	}

	void ImageBuffer::putUnmultipliedImageData(ImageData* source, const IntRect& sourceRect, const IntPoint& destPoint)
	{
	putImageData<Unmultiplied>(source, sourceRect, destPoint, *context()->platformContext()->bitmap(), m_size);
	}

	void ImageBuffer::putPremultipliedImageData(ImageData* source, const IntRect& sourceRect, const IntPoint& destPoint)
	{
	putImageData<Premultiplied>(source, sourceRect, destPoint, *context()->platformContext()->bitmap(), m_size);
	}

	String ImageBuffer::toDataURL(const String&) const
	{
	// Encode the image into a vector.
	Vector<unsigned char> pngEncodedData;
	PNGImageEncoder::encode(*context()->platformContext()->bitmap(), &pngEncodedData);

	// Convert it into base64.
	Vector<char> base64EncodedData;
	base64Encode(reinterpret_cast<Vector<char>>(&pngEncodedData), base64EncodedData);
	// Append with a \0 so that it's a valid string.
	base64EncodedData.append('\0');

	// And the resulting string.
	return String::format("data:image/png;base64,%s", base64EncodedData.data());
	}

	} // namespace WebCore