1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "config.h" 6 #include "core/page/ImageBitmap.h" 7 8 #include "core/html/HTMLCanvasElement.h" 9 #include "core/html/HTMLImageElement.h" 10 #include "core/html/HTMLVideoElement.h" 11 #include "core/html/ImageData.h" 12 #include "core/platform/graphics/BitmapImage.h" 13 #include "core/platform/graphics/GraphicsContext.h" 14 #include "wtf/RefPtr.h" 15 16 using namespace std; 17 18 namespace WebCore { 19 20 static inline IntRect normalizeRect(const IntRect& rect) 21 { 22 return IntRect(min(rect.x(), rect.maxX()), 23 min(rect.y(), rect.maxY()), 24 max(rect.width(), -rect.width()), 25 max(rect.height(), -rect.height())); 26 } 27 28 static inline PassRefPtr<Image> cropImage(Image* image, const IntRect& cropRect) 29 { 30 SkBitmap cropped; 31 image->nativeImageForCurrentFrame()->bitmap().extractSubset(&cropped, cropRect); 32 return BitmapImage::create(NativeImageSkia::create(cropped)); 33 } 34 35 ImageBitmap::ImageBitmap(HTMLImageElement* image, const IntRect& cropRect) 36 : m_cropRect(cropRect) 37 , m_bitmap(0) 38 , m_imageElement(image) 39 { 40 IntRect srcRect = intersection(cropRect, IntRect(0, 0, image->width(), image->height())); 41 m_bitmapRect = IntRect(IntPoint(max(0, -cropRect.x()), max(0, -cropRect.y())), srcRect.size()); 42 m_bitmapOffset = srcRect.location(); 43 44 if (!srcRect.width() || !srcRect.height()) 45 m_imageElement = 0; 46 else 47 m_imageElement->addClient(this); 48 49 ScriptWrappable::init(this); 50 } 51 52 ImageBitmap::ImageBitmap(HTMLVideoElement* video, const IntRect& cropRect) 53 : m_cropRect(cropRect) 54 , m_imageElement(0) 55 , m_bitmapOffset(IntPoint()) 56 { 57 IntRect videoRect = IntRect(IntPoint(), video->player()->naturalSize()); 58 IntRect srcRect = intersection(cropRect, videoRect); 59 IntRect dstRect(IntPoint(), srcRect.size()); 60 61 m_buffer = ImageBuffer::create(videoRect.size()); 62 GraphicsContext* c = m_buffer->context(); 63 c->clip(dstRect); 64 c->translate(-srcRect.x(), -srcRect.y()); 65 video->paintCurrentFrameInContext(c, videoRect); 66 m_bitmap = m_buffer->copyImage(DontCopyBackingStore); 67 m_bitmapRect = IntRect(IntPoint(max(0, -cropRect.x()), max(0, -cropRect.y())), srcRect.size()); 68 69 ScriptWrappable::init(this); 70 } 71 72 ImageBitmap::ImageBitmap(HTMLCanvasElement* canvas, const IntRect& cropRect) 73 : m_cropRect(cropRect) 74 , m_imageElement(0) 75 , m_bitmapOffset(IntPoint()) 76 { 77 IntSize canvasSize = canvas->size(); 78 IntRect srcRect = intersection(cropRect, IntRect(IntPoint(), canvasSize)); 79 IntRect dstRect(IntPoint(), srcRect.size()); 80 81 m_buffer = ImageBuffer::create(canvasSize); 82 m_buffer->context()->drawImageBuffer(canvas->buffer(), dstRect, srcRect); 83 m_bitmap = m_buffer->copyImage(DontCopyBackingStore); 84 m_bitmapRect = IntRect(IntPoint(max(0, -cropRect.x()), max(0, -cropRect.y())), srcRect.size()); 85 86 ScriptWrappable::init(this); 87 } 88 89 ImageBitmap::ImageBitmap(ImageData* data, const IntRect& cropRect) 90 : m_cropRect(cropRect) 91 , m_imageElement(0) 92 , m_bitmapOffset(IntPoint()) 93 { 94 IntRect srcRect = intersection(cropRect, IntRect(IntPoint(), data->size())); 95 96 m_buffer = ImageBuffer::create(data->size()); 97 if (srcRect.width() > 0 && srcRect.height() > 0) 98 m_buffer->putByteArray(Unmultiplied, data->data(), data->size(), srcRect, IntPoint(min(0, -cropRect.x()), min(0, -cropRect.y()))); 99 100 m_bitmap = m_buffer->copyImage(DontCopyBackingStore); 101 m_bitmapRect = IntRect(IntPoint(max(0, -cropRect.x()), max(0, -cropRect.y())), srcRect.size()); 102 103 ScriptWrappable::init(this); 104 } 105 106 ImageBitmap::ImageBitmap(ImageBitmap* bitmap, const IntRect& cropRect) 107 : m_cropRect(cropRect) 108 , m_bitmap(0) 109 , m_imageElement(bitmap->imageElement()) 110 , m_bitmapOffset(IntPoint()) 111 { 112 IntRect oldBitmapRect = bitmap->bitmapRect(); 113 IntRect srcRect = intersection(cropRect, oldBitmapRect); 114 m_bitmapRect = IntRect(IntPoint(max(0, oldBitmapRect.x() - cropRect.x()), max(0, oldBitmapRect.y() - cropRect.y())), srcRect.size()); 115 116 if (m_imageElement) { 117 m_imageElement->addClient(this); 118 m_bitmapOffset = srcRect.location(); 119 } else if (bitmap->bitmapImage()) { 120 IntRect adjustedCropRect(IntPoint(cropRect.x() -oldBitmapRect.x(), cropRect.y() - oldBitmapRect.y()), cropRect.size()); 121 m_bitmap = cropImage(bitmap->bitmapImage().get(), adjustedCropRect); 122 } 123 124 ScriptWrappable::init(this); 125 } 126 127 ImageBitmap::~ImageBitmap() 128 { 129 if (m_imageElement) 130 m_imageElement->removeClient(this); 131 } 132 133 PassRefPtr<ImageBitmap> ImageBitmap::create(HTMLImageElement* image, const IntRect& cropRect) 134 { 135 IntRect normalizedCropRect = normalizeRect(cropRect); 136 RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(image, normalizedCropRect))); 137 return imageBitmap.release(); 138 } 139 140 PassRefPtr<ImageBitmap> ImageBitmap::create(HTMLVideoElement* video, const IntRect& cropRect) 141 { 142 IntRect normalizedCropRect = normalizeRect(cropRect); 143 RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(video, normalizedCropRect))); 144 return imageBitmap.release(); 145 } 146 147 PassRefPtr<ImageBitmap> ImageBitmap::create(HTMLCanvasElement* canvas, const IntRect& cropRect) 148 { 149 IntRect normalizedCropRect = normalizeRect(cropRect); 150 RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(canvas, normalizedCropRect))); 151 return imageBitmap.release(); 152 } 153 154 PassRefPtr<ImageBitmap> ImageBitmap::create(ImageData* data, const IntRect& cropRect) 155 { 156 IntRect normalizedCropRect = normalizeRect(cropRect); 157 RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(data, normalizedCropRect))); 158 return imageBitmap.release(); 159 } 160 161 PassRefPtr<ImageBitmap> ImageBitmap::create(ImageBitmap* bitmap, const IntRect& cropRect) 162 { 163 IntRect normalizedCropRect = normalizeRect(cropRect); 164 RefPtr<ImageBitmap> imageBitmap(adoptRef(new ImageBitmap(bitmap, normalizedCropRect))); 165 return imageBitmap.release(); 166 } 167 168 void ImageBitmap::notifyImageSourceChanged() 169 { 170 m_bitmap = cropImage(m_imageElement->cachedImage()->image(), m_cropRect); 171 m_bitmapOffset = IntPoint(); 172 m_imageElement = 0; 173 } 174 175 PassRefPtr<Image> ImageBitmap::bitmapImage() const 176 { 177 ASSERT((m_imageElement || m_bitmap || !m_bitmapRect.width() || !m_bitmapRect.height()) && (!m_imageElement || !m_bitmap)); 178 if (m_imageElement) 179 return m_imageElement->cachedImage()->image(); 180 return m_bitmap; 181 } 182 183 } 184
