2 * Copyright (c) 2008, Google Inc. All rights reserved.
3 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
4 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
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7 * modification, are permitted provided that the following conditions are
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13 * copyright notice, this list of conditions and the following disclaimer
14 * in the documentation and/or other materials provided with the
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18 * this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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34 #include "platform/graphics/ImageBuffer.h"
36 #include "platform/MIMETypeRegistry.h"
37 #include "platform/geometry/IntRect.h"
38 #include "platform/graphics/BitmapImage.h"
39 #include "platform/graphics/GraphicsContext.h"
40 #include "platform/graphics/GraphicsContext3D.h"
41 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
42 #include "platform/graphics/gpu/DrawingBuffer.h"
43 #include "platform/graphics/gpu/SharedGraphicsContext3D.h"
44 #include "platform/graphics/skia/NativeImageSkia.h"
45 #include "platform/graphics/skia/SkiaUtils.h"
46 #include "platform/image-encoders/skia/JPEGImageEncoder.h"
47 #include "platform/image-encoders/skia/PNGImageEncoder.h"
48 #include "platform/image-encoders/skia/WEBPImageEncoder.h"
49 #include "public/platform/Platform.h"
50 #include "public/platform/WebGraphicsContext3D.h"
51 #include "third_party/skia/include/effects/SkTableColorFilter.h"
52 #include "wtf/MathExtras.h"
53 #include "wtf/text/Base64.h"
54 #include "wtf/text/WTFString.h"
60 PassOwnPtr<ImageBuffer> ImageBuffer::create(PassOwnPtr<ImageBufferSurface> surface)
62 if (!surface->isValid())
64 return adoptPtr(new ImageBuffer(surface));
67 PassOwnPtr<ImageBuffer> ImageBuffer::create(const IntSize& size, OpacityMode opacityMode)
69 OwnPtr<ImageBufferSurface> surface = adoptPtr(new UnacceleratedImageBufferSurface(size, opacityMode));
70 if (!surface->isValid())
72 return adoptPtr(new ImageBuffer(surface.release()));
75 ImageBuffer::ImageBuffer(PassOwnPtr<ImageBufferSurface> surface)
78 if (m_surface->canvas()) {
79 m_context = adoptPtr(new GraphicsContext(m_surface->canvas()));
80 m_context->setCertainlyOpaque(m_surface->opacityMode() == Opaque);
81 m_context->setAccelerated(m_surface->isAccelerated());
85 ImageBuffer::~ImageBuffer()
89 GraphicsContext* ImageBuffer::context() const
92 ASSERT(m_context.get());
93 return m_context.get();
96 const SkBitmap& ImageBuffer::bitmap() const
99 return m_surface->bitmap();
102 bool ImageBuffer::isValid() const
104 return m_surface->isValid();
107 static SkBitmap deepSkBitmapCopy(const SkBitmap& bitmap)
110 if (!bitmap.deepCopyTo(&tmp, bitmap.config()))
111 bitmap.copyTo(&tmp, bitmap.config());
116 PassRefPtr<Image> ImageBuffer::copyImage(BackingStoreCopy copyBehavior, ScaleBehavior) const
119 return BitmapImage::create(NativeImageSkia::create());
121 const SkBitmap& bitmap = m_surface->bitmap();
122 return BitmapImage::create(NativeImageSkia::create(copyBehavior == CopyBackingStore ? deepSkBitmapCopy(bitmap) : bitmap));
125 BackingStoreCopy ImageBuffer::fastCopyImageMode()
127 return DontCopyBackingStore;
130 blink::WebLayer* ImageBuffer::platformLayer() const
132 return m_surface->layer();
135 bool ImageBuffer::copyToPlatformTexture(GraphicsContext3D& contextSupport, Platform3DObject texture, GLenum internalFormat, GLenum destType, GLint level, bool premultiplyAlpha, bool flipY)
137 if (!m_surface->isAccelerated() || !platformLayer() || !isValid())
140 blink::WebGraphicsContext3D* context = contextSupport.webContext();
142 if (!context->makeContextCurrent())
145 if (!contextSupport.supportsExtension("GL_CHROMIUM_copy_texture") || !contextSupport.supportsExtension("GL_CHROMIUM_flipy")
146 || !contextSupport.canUseCopyTextureCHROMIUM(internalFormat, destType, level))
149 // The canvas is stored in a premultiplied format, so unpremultiply if necessary.
150 context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, !premultiplyAlpha);
152 // The canvas is stored in an inverted position, so the flip semantics are reversed.
153 context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, !flipY);
154 context->copyTextureCHROMIUM(GL_TEXTURE_2D, getBackingTexture(), texture, level, internalFormat, destType);
156 context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, false);
157 context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
162 static bool drawNeedsCopy(GraphicsContext* src, GraphicsContext* dst)
168 Platform3DObject ImageBuffer::getBackingTexture()
170 return m_surface->getBackingTexture();
173 bool ImageBuffer::copyRenderingResultsFromDrawingBuffer(DrawingBuffer* drawingBuffer)
177 RefPtr<GraphicsContext3D> context3D = SharedGraphicsContext3D::get();
178 Platform3DObject tex = m_surface->getBackingTexture();
179 if (!context3D || !tex)
181 m_surface->invalidateCachedBitmap();
182 return drawingBuffer->copyToPlatformTexture(*(context3D.get()), tex, GL_RGBA,
183 GL_UNSIGNED_BYTE, 0, true, false);
186 void ImageBuffer::draw(GraphicsContext* context, const FloatRect& destRect, const FloatRect& srcRect,
187 CompositeOperator op, blink::WebBlendMode blendMode, bool useLowQualityScale)
192 SkBitmap bitmap = m_surface->bitmap();
193 // For ImageBufferSurface that enables cachedBitmap, Use the cached Bitmap for CPU side usage
194 // if it is available, otherwise generate and use it.
195 if (!context->isAccelerated() && m_surface->isAccelerated() && m_surface->cachedBitmapEnabled() && m_surface->isValid()) {
196 m_surface->updateCachedBitmapIfNeeded();
197 bitmap = m_surface->cachedBitmap();
200 RefPtr<Image> image = BitmapImage::create(NativeImageSkia::create(drawNeedsCopy(m_context.get(), context) ? deepSkBitmapCopy(bitmap) : bitmap));
202 context->drawImage(image.get(), destRect, srcRect, op, blendMode, DoNotRespectImageOrientation, useLowQualityScale);
205 void ImageBuffer::flush()
207 if (m_surface->canvas()) {
208 m_surface->canvas()->flush();
212 void ImageBuffer::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const FloatSize& scale,
213 const FloatPoint& phase, CompositeOperator op, const FloatRect& destRect, blink::WebBlendMode blendMode, const IntSize& repeatSpacing)
218 const SkBitmap& bitmap = m_surface->bitmap();
219 RefPtr<Image> image = BitmapImage::create(NativeImageSkia::create(drawNeedsCopy(m_context.get(), context) ? deepSkBitmapCopy(bitmap) : bitmap));
220 image->drawPattern(context, srcRect, scale, phase, op, destRect, blendMode, repeatSpacing);
223 void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
225 const uint8_t* lookUpTable = ColorSpaceUtilities::getConversionLUT(dstColorSpace, srcColorSpace);
229 // FIXME: Disable color space conversions on accelerated canvases (for now).
230 if (context()->isAccelerated() || !isValid())
233 const SkBitmap& bitmap = m_surface->bitmap();
237 ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
238 IntSize size = m_surface->size();
239 SkAutoLockPixels bitmapLock(bitmap);
240 for (int y = 0; y < size.height(); ++y) {
241 uint32_t* srcRow = bitmap.getAddr32(0, y);
242 for (int x = 0; x < size.width(); ++x) {
243 SkColor color = SkPMColorToColor(srcRow[x]);
244 srcRow[x] = SkPreMultiplyARGB(
246 lookUpTable[SkColorGetR(color)],
247 lookUpTable[SkColorGetG(color)],
248 lookUpTable[SkColorGetB(color)]);
253 PassRefPtr<SkColorFilter> ImageBuffer::createColorSpaceFilter(ColorSpace srcColorSpace,
254 ColorSpace dstColorSpace)
256 const uint8_t* lut = ColorSpaceUtilities::getConversionLUT(dstColorSpace, srcColorSpace);
260 return adoptRef(SkTableColorFilter::CreateARGB(0, lut, lut, lut));
263 template <Multiply multiplied>
264 PassRefPtr<Uint8ClampedArray> getImageData(const IntRect& rect, GraphicsContext* context, const IntSize& size)
266 float area = 4.0f * rect.width() * rect.height();
267 if (area > static_cast<float>(std::numeric_limits<int>::max()))
270 RefPtr<Uint8ClampedArray> result = Uint8ClampedArray::createUninitialized(rect.width() * rect.height() * 4);
272 unsigned char* data = result->data();
276 || rect.maxX() > size.width()
277 || rect.maxY() > size.height())
280 unsigned destBytesPerRow = 4 * rect.width();
282 destBitmap.setConfig(SkBitmap::kARGB_8888_Config, rect.width(), rect.height(), destBytesPerRow);
283 destBitmap.setPixels(data);
285 SkCanvas::Config8888 config8888;
286 if (multiplied == Premultiplied)
287 config8888 = SkCanvas::kRGBA_Premul_Config8888;
289 config8888 = SkCanvas::kRGBA_Unpremul_Config8888;
291 context->readPixels(&destBitmap, rect.x(), rect.y(), config8888);
292 return result.release();
295 PassRefPtr<Uint8ClampedArray> ImageBuffer::getUnmultipliedImageData(const IntRect& rect) const
298 return Uint8ClampedArray::create(rect.width() * rect.height() * 4);
299 return getImageData<Unmultiplied>(rect, context(), m_surface->size());
302 PassRefPtr<Uint8ClampedArray> ImageBuffer::getPremultipliedImageData(const IntRect& rect) const
305 return Uint8ClampedArray::create(rect.width() * rect.height() * 4);
306 return getImageData<Premultiplied>(rect, context(), m_surface->size());
309 void ImageBuffer::putByteArray(Multiply multiplied, Uint8ClampedArray* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint)
314 ASSERT(sourceRect.width() > 0);
315 ASSERT(sourceRect.height() > 0);
317 int originX = sourceRect.x();
318 int destX = destPoint.x() + sourceRect.x();
320 ASSERT(destX < m_surface->size().width());
321 ASSERT(originX >= 0);
322 ASSERT(originX < sourceRect.maxX());
324 int endX = destPoint.x() + sourceRect.maxX();
325 ASSERT(endX <= m_surface->size().width());
327 int numColumns = endX - destX;
329 int originY = sourceRect.y();
330 int destY = destPoint.y() + sourceRect.y();
332 ASSERT(destY < m_surface->size().height());
333 ASSERT(originY >= 0);
334 ASSERT(originY < sourceRect.maxY());
336 int endY = destPoint.y() + sourceRect.maxY();
337 ASSERT(endY <= m_surface->size().height());
338 int numRows = endY - destY;
340 unsigned srcBytesPerRow = 4 * sourceSize.width();
342 srcBitmap.setConfig(SkBitmap::kARGB_8888_Config, numColumns, numRows, srcBytesPerRow);
343 srcBitmap.setPixels(source->data() + originY * srcBytesPerRow + originX * 4);
345 SkCanvas::Config8888 config8888;
346 if (multiplied == Premultiplied)
347 config8888 = SkCanvas::kRGBA_Premul_Config8888;
349 config8888 = SkCanvas::kRGBA_Unpremul_Config8888;
351 context()->writePixels(srcBitmap, destX, destY, config8888);
354 template <typename T>
355 static bool encodeImage(T& source, const String& mimeType, const double* quality, Vector<char>* output)
357 Vector<unsigned char>* encodedImage = reinterpret_cast<Vector<unsigned char>*>(output);
359 if (mimeType == "image/jpeg") {
360 int compressionQuality = JPEGImageEncoder::DefaultCompressionQuality;
361 if (quality && *quality >= 0.0 && *quality <= 1.0)
362 compressionQuality = static_cast<int>(*quality * 100 + 0.5);
363 if (!JPEGImageEncoder::encode(source, compressionQuality, encodedImage))
365 } else if (mimeType == "image/webp") {
366 int compressionQuality = WEBPImageEncoder::DefaultCompressionQuality;
367 if (quality && *quality >= 0.0 && *quality <= 1.0)
368 compressionQuality = static_cast<int>(*quality * 100 + 0.5);
369 if (!WEBPImageEncoder::encode(source, compressionQuality, encodedImage))
372 if (!PNGImageEncoder::encode(source, encodedImage))
374 ASSERT(mimeType == "image/png");
380 String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
382 ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
384 Vector<char> encodedImage;
385 if (!isValid() || !encodeImage(m_surface->bitmap(), mimeType, quality, &encodedImage))
387 Vector<char> base64Data;
388 base64Encode(encodedImage, base64Data);
390 return "data:" + mimeType + ";base64," + base64Data;
393 String ImageDataToDataURL(const ImageDataBuffer& imageData, const String& mimeType, const double* quality)
395 ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
397 Vector<char> encodedImage;
398 if (!encodeImage(imageData, mimeType, quality, &encodedImage))
401 Vector<char> base64Data;
402 base64Encode(encodedImage, base64Data);
404 return "data:" + mimeType + ";base64," + base64Data;
407 } // namespace WebCore