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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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/GraphicsTypes3D.h"
41 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
42 #include "platform/graphics/gpu/DrawingBuffer.h"
43 #include "platform/graphics/gpu/Extensions3DUtil.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 "public/platform/WebGraphicsContext3DProvider.h"
52 #include "third_party/skia/include/effects/SkTableColorFilter.h"
53 #include "wtf/MathExtras.h"
54 #include "wtf/text/Base64.h"
55 #include "wtf/text/WTFString.h"
61 PassOwnPtr<ImageBuffer> ImageBuffer::create(PassOwnPtr<ImageBufferSurface> surface)
63 if (!surface->isValid())
65 return adoptPtr(new ImageBuffer(surface));
68 PassOwnPtr<ImageBuffer> ImageBuffer::create(const IntSize& size, OpacityMode opacityMode)
70 OwnPtr<ImageBufferSurface> surface = adoptPtr(new UnacceleratedImageBufferSurface(size, opacityMode));
71 if (!surface->isValid())
73 return adoptPtr(new ImageBuffer(surface.release()));
76 ImageBuffer::ImageBuffer(PassOwnPtr<ImageBufferSurface> surface)
79 if (m_surface->canvas()) {
80 m_context = adoptPtr(new GraphicsContext(m_surface->canvas()));
81 m_context->setCertainlyOpaque(m_surface->opacityMode() == Opaque);
82 m_context->setAccelerated(m_surface->isAccelerated());
86 ImageBuffer::~ImageBuffer()
90 GraphicsContext* ImageBuffer::context() const
93 ASSERT(m_context.get());
94 return m_context.get();
97 const SkBitmap& ImageBuffer::bitmap() const
100 return m_surface->bitmap();
103 bool ImageBuffer::isValid() const
105 return m_surface->isValid();
108 static SkBitmap deepSkBitmapCopy(const SkBitmap& bitmap)
111 if (!bitmap.deepCopyTo(&tmp, bitmap.config()))
112 bitmap.copyTo(&tmp, bitmap.config());
117 PassRefPtr<Image> ImageBuffer::copyImage(BackingStoreCopy copyBehavior, ScaleBehavior) const
120 return BitmapImage::create(NativeImageSkia::create());
122 const SkBitmap& bitmap = m_surface->bitmap();
123 return BitmapImage::create(NativeImageSkia::create(copyBehavior == CopyBackingStore ? deepSkBitmapCopy(bitmap) : bitmap));
126 BackingStoreCopy ImageBuffer::fastCopyImageMode()
128 return DontCopyBackingStore;
131 blink::WebLayer* ImageBuffer::platformLayer() const
133 return m_surface->layer();
136 bool ImageBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context, Platform3DObject texture, GLenum internalFormat, GLenum destType, GLint level, bool premultiplyAlpha, bool flipY)
138 if (!m_surface->isAccelerated() || !platformLayer() || !isValid())
141 if (!context->makeContextCurrent())
144 if (!Extensions3DUtil::canUseCopyTextureCHROMIUM(internalFormat, destType, level))
147 // The canvas is stored in a premultiplied format, so unpremultiply if necessary.
148 context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, !premultiplyAlpha);
150 // The canvas is stored in an inverted position, so the flip semantics are reversed.
151 context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, !flipY);
152 context->copyTextureCHROMIUM(GL_TEXTURE_2D, getBackingTexture(), texture, level, internalFormat, destType);
154 context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, false);
155 context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
160 static bool drawNeedsCopy(GraphicsContext* src, GraphicsContext* dst)
166 Platform3DObject ImageBuffer::getBackingTexture()
168 return m_surface->getBackingTexture();
171 bool ImageBuffer::copyRenderingResultsFromDrawingBuffer(DrawingBuffer* drawingBuffer)
175 OwnPtr<blink::WebGraphicsContext3DProvider> provider = adoptPtr(blink::Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
178 blink::WebGraphicsContext3D* context3D = provider->context3d();
179 Platform3DObject tex = m_surface->getBackingTexture();
180 if (!context3D || !tex)
182 m_surface->invalidateCachedBitmap();
183 return drawingBuffer->copyToPlatformTexture(context3D, tex, GL_RGBA,
184 GL_UNSIGNED_BYTE, 0, true, false);
187 void ImageBuffer::draw(GraphicsContext* context, const FloatRect& destRect, const FloatRect& srcRect,
188 CompositeOperator op, blink::WebBlendMode blendMode, bool useLowQualityScale)
193 SkBitmap bitmap = m_surface->bitmap();
194 // For ImageBufferSurface that enables cachedBitmap, Use the cached Bitmap for CPU side usage
195 // if it is available, otherwise generate and use it.
196 if (!context->isAccelerated() && m_surface->isAccelerated() && m_surface->cachedBitmapEnabled() && m_surface->isValid()) {
197 m_surface->updateCachedBitmapIfNeeded();
198 bitmap = m_surface->cachedBitmap();
201 RefPtr<Image> image = BitmapImage::create(NativeImageSkia::create(drawNeedsCopy(m_context.get(), context) ? deepSkBitmapCopy(bitmap) : bitmap));
203 context->drawImage(image.get(), destRect, srcRect, op, blendMode, DoNotRespectImageOrientation, useLowQualityScale);
206 void ImageBuffer::flush()
208 if (m_surface->canvas()) {
209 m_surface->canvas()->flush();
213 void ImageBuffer::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const FloatSize& scale,
214 const FloatPoint& phase, CompositeOperator op, const FloatRect& destRect, blink::WebBlendMode blendMode, const IntSize& repeatSpacing)
219 const SkBitmap& bitmap = m_surface->bitmap();
220 RefPtr<Image> image = BitmapImage::create(NativeImageSkia::create(drawNeedsCopy(m_context.get(), context) ? deepSkBitmapCopy(bitmap) : bitmap));
221 image->drawPattern(context, srcRect, scale, phase, op, destRect, blendMode, repeatSpacing);
224 void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
226 const uint8_t* lookUpTable = ColorSpaceUtilities::getConversionLUT(dstColorSpace, srcColorSpace);
230 // FIXME: Disable color space conversions on accelerated canvases (for now).
231 if (context()->isAccelerated() || !isValid())
234 const SkBitmap& bitmap = m_surface->bitmap();
238 ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
239 IntSize size = m_surface->size();
240 SkAutoLockPixels bitmapLock(bitmap);
241 for (int y = 0; y < size.height(); ++y) {
242 uint32_t* srcRow = bitmap.getAddr32(0, y);
243 for (int x = 0; x < size.width(); ++x) {
244 SkColor color = SkPMColorToColor(srcRow[x]);
245 srcRow[x] = SkPreMultiplyARGB(
247 lookUpTable[SkColorGetR(color)],
248 lookUpTable[SkColorGetG(color)],
249 lookUpTable[SkColorGetB(color)]);
254 PassRefPtr<SkColorFilter> ImageBuffer::createColorSpaceFilter(ColorSpace srcColorSpace,
255 ColorSpace dstColorSpace)
257 const uint8_t* lut = ColorSpaceUtilities::getConversionLUT(dstColorSpace, srcColorSpace);
261 return adoptRef(SkTableColorFilter::CreateARGB(0, lut, lut, lut));
264 template <Multiply multiplied>
265 PassRefPtr<Uint8ClampedArray> getImageData(const IntRect& rect, GraphicsContext* context, const IntSize& size)
267 float area = 4.0f * rect.width() * rect.height();
268 if (area > static_cast<float>(std::numeric_limits<int>::max()))
271 RefPtr<Uint8ClampedArray> result = Uint8ClampedArray::createUninitialized(rect.width() * rect.height() * 4);
273 unsigned char* data = result->data();
277 || rect.maxX() > size.width()
278 || rect.maxY() > size.height())
281 unsigned destBytesPerRow = 4 * rect.width();
283 destBitmap.setConfig(SkBitmap::kARGB_8888_Config, rect.width(), rect.height(), destBytesPerRow);
284 destBitmap.setPixels(data);
286 SkCanvas::Config8888 config8888;
287 if (multiplied == Premultiplied)
288 config8888 = SkCanvas::kRGBA_Premul_Config8888;
290 config8888 = SkCanvas::kRGBA_Unpremul_Config8888;
292 context->readPixels(&destBitmap, rect.x(), rect.y(), config8888);
293 return result.release();
296 PassRefPtr<Uint8ClampedArray> ImageBuffer::getUnmultipliedImageData(const IntRect& rect) const
299 return Uint8ClampedArray::create(rect.width() * rect.height() * 4);
300 return getImageData<Unmultiplied>(rect, context(), m_surface->size());
303 PassRefPtr<Uint8ClampedArray> ImageBuffer::getPremultipliedImageData(const IntRect& rect) const
306 return Uint8ClampedArray::create(rect.width() * rect.height() * 4);
307 return getImageData<Premultiplied>(rect, context(), m_surface->size());
310 void ImageBuffer::putByteArray(Multiply multiplied, Uint8ClampedArray* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint)
315 ASSERT(sourceRect.width() > 0);
316 ASSERT(sourceRect.height() > 0);
318 int originX = sourceRect.x();
319 int destX = destPoint.x() + sourceRect.x();
321 ASSERT(destX < m_surface->size().width());
322 ASSERT(originX >= 0);
323 ASSERT(originX < sourceRect.maxX());
325 int endX = destPoint.x() + sourceRect.maxX();
326 ASSERT(endX <= m_surface->size().width());
328 int numColumns = endX - destX;
330 int originY = sourceRect.y();
331 int destY = destPoint.y() + sourceRect.y();
333 ASSERT(destY < m_surface->size().height());
334 ASSERT(originY >= 0);
335 ASSERT(originY < sourceRect.maxY());
337 int endY = destPoint.y() + sourceRect.maxY();
338 ASSERT(endY <= m_surface->size().height());
339 int numRows = endY - destY;
341 unsigned srcBytesPerRow = 4 * sourceSize.width();
343 srcBitmap.setConfig(SkBitmap::kARGB_8888_Config, numColumns, numRows, srcBytesPerRow);
344 srcBitmap.setPixels(source->data() + originY * srcBytesPerRow + originX * 4);
346 SkCanvas::Config8888 config8888;
347 if (multiplied == Premultiplied)
348 config8888 = SkCanvas::kRGBA_Premul_Config8888;
350 config8888 = SkCanvas::kRGBA_Unpremul_Config8888;
352 context()->writePixels(srcBitmap, destX, destY, config8888);
355 template <typename T>
356 static bool encodeImage(T& source, const String& mimeType, const double* quality, Vector<char>* output)
358 Vector<unsigned char>* encodedImage = reinterpret_cast<Vector<unsigned char>*>(output);
360 if (mimeType == "image/jpeg") {
361 int compressionQuality = JPEGImageEncoder::DefaultCompressionQuality;
362 if (quality && *quality >= 0.0 && *quality <= 1.0)
363 compressionQuality = static_cast<int>(*quality * 100 + 0.5);
364 if (!JPEGImageEncoder::encode(source, compressionQuality, encodedImage))
366 } else if (mimeType == "image/webp") {
367 int compressionQuality = WEBPImageEncoder::DefaultCompressionQuality;
368 if (quality && *quality >= 0.0 && *quality <= 1.0)
369 compressionQuality = static_cast<int>(*quality * 100 + 0.5);
370 if (!WEBPImageEncoder::encode(source, compressionQuality, encodedImage))
373 if (!PNGImageEncoder::encode(source, encodedImage))
375 ASSERT(mimeType == "image/png");
381 String ImageBuffer::toDataURL(const String& mimeType, const double* quality) const
383 ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
385 Vector<char> encodedImage;
386 if (!isValid() || !encodeImage(m_surface->bitmap(), mimeType, quality, &encodedImage))
388 Vector<char> base64Data;
389 base64Encode(encodedImage, base64Data);
391 return "data:" + mimeType + ";base64," + base64Data;
394 String ImageDataToDataURL(const ImageDataBuffer& imageData, const String& mimeType, const double* quality)
396 ASSERT(MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType));
398 Vector<char> encodedImage;
399 if (!encodeImage(imageData, mimeType, quality, &encodedImage))
402 Vector<char> base64Data;
403 base64Encode(encodedImage, base64Data);
405 return "data:" + mimeType + ";base64," + base64Data;
408 } // namespace WebCore