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| 1 // Copyright (c) 2006-2008 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 <time.h> | |
| 6 | |
| 7 #include "SkMatrix.h" | |
| 8 #include "SkRegion.h" | |
| 9 #include "SkUtils.h" | |
| 10 | |
| 11 #include "base/gfx/bitmap_platform_device_mac.h" | |
| 12 #include "base/gfx/skia_utils_mac.h" | |
| 13 #include "base/logging.h" | |
| 14 | |
| 15 namespace gfx { | |
| 16 | |
| 17 namespace { | |
| 18 | |
| 19 // Constrains position and size to fit within available_size. If |size| is -1, | |
| 20 // all the |available_size| is used. Returns false if the position is out of | |
| 21 // |available_size|. | |
| 22 bool Constrain(int available_size, int* position, int *size) { | |
| 23 if (*size < -2) | |
| 24 return false; | |
| 25 | |
| 26 if (*position < 0) { | |
| 27 if (*size != -1) | |
| 28 *size += *position; | |
| 29 *position = 0; | |
| 30 } | |
| 31 if (*size == 0 || *position >= available_size) | |
| 32 return false; | |
| 33 | |
| 34 if (*size > 0) { | |
| 35 int overflow = (*position + *size) - available_size; | |
| 36 if (overflow > 0) { | |
| 37 *size -= overflow; | |
| 38 } | |
| 39 } else { | |
| 40 // Fill up available size. | |
| 41 *size = available_size - *position; | |
| 42 } | |
| 43 return true; | |
| 44 } | |
| 45 | |
| 46 } // namespace | |
| 47 | |
| 48 class BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData | |
| 49 : public base::RefCounted<BitmapPlatformDeviceMacData> { | |
| 50 public: | |
| 51 explicit BitmapPlatformDeviceMacData(CGContextRef bitmap); | |
| 52 | |
| 53 // Create/destroy CoreGraphics context for our bitmap data. | |
| 54 CGContextRef GetBitmapContext() { | |
| 55 LoadConfig(); | |
| 56 return bitmap_context_; | |
| 57 } | |
| 58 | |
| 59 void ReleaseBitmapContext() { | |
| 60 DCHECK(bitmap_context_); | |
| 61 CGContextRelease(bitmap_context_); | |
| 62 bitmap_context_ = NULL; | |
| 63 } | |
| 64 | |
| 65 // Sets the transform and clip operations. This will not update the CGContext, | |
| 66 // but will mark the config as dirty. The next call of LoadConfig will | |
| 67 // pick up these changes. | |
| 68 void SetMatrixClip(const SkMatrix& transform, const SkRegion& region); | |
| 69 | |
| 70 // Loads the current transform and clip into the DC. Can be called even when | |
| 71 // |bitmap_context_| is NULL (will be a NOP). | |
| 72 void LoadConfig(); | |
| 73 | |
| 74 // Lazily-created graphics context used to draw into the bitmap. | |
| 75 CGContextRef bitmap_context_; | |
| 76 | |
| 77 // True when there is a transform or clip that has not been set to the | |
| 78 // CGContext. The CGContext is retrieved for every text operation, and the | |
| 79 // transform and clip do not change as much. We can save time by not loading | |
| 80 // the clip and transform for every one. | |
| 81 bool config_dirty_; | |
| 82 | |
| 83 // Translation assigned to the CGContext: we need to keep track of this | |
| 84 // separately so it can be updated even if the CGContext isn't created yet. | |
| 85 SkMatrix transform_; | |
| 86 | |
| 87 // The current clipping | |
| 88 SkRegion clip_region_; | |
| 89 | |
| 90 private: | |
| 91 friend class base::RefCounted<BitmapPlatformDeviceMacData>; | |
| 92 ~BitmapPlatformDeviceMacData() { | |
| 93 if (bitmap_context_) | |
| 94 CGContextRelease(bitmap_context_); | |
| 95 } | |
| 96 | |
| 97 DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDeviceMacData); | |
| 98 }; | |
| 99 | |
| 100 BitmapPlatformDeviceMac::\ | |
| 101 BitmapPlatformDeviceMacData::BitmapPlatformDeviceMacData( | |
| 102 CGContextRef bitmap) | |
| 103 : bitmap_context_(bitmap), | |
| 104 config_dirty_(true) { // Want to load the config next time. | |
| 105 DCHECK(bitmap_context_); | |
| 106 // Initialize the clip region to the entire bitmap. | |
| 107 | |
| 108 SkIRect rect; | |
| 109 rect.set(0, 0, | |
| 110 CGBitmapContextGetWidth(bitmap_context_), | |
| 111 CGBitmapContextGetHeight(bitmap_context_)); | |
| 112 clip_region_ = SkRegion(rect); | |
| 113 transform_.reset(); | |
| 114 CGContextRetain(bitmap_context_); | |
| 115 } | |
| 116 | |
| 117 void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::SetMatrixClip( | |
| 118 const SkMatrix& transform, | |
| 119 const SkRegion& region) { | |
| 120 transform_ = transform; | |
| 121 clip_region_ = region; | |
| 122 config_dirty_ = true; | |
| 123 } | |
| 124 | |
| 125 void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::LoadConfig() { | |
| 126 if (!config_dirty_ || !bitmap_context_) | |
| 127 return; // Nothing to do. | |
| 128 config_dirty_ = false; | |
| 129 | |
| 130 // Transform. | |
| 131 SkMatrix t(transform_); | |
| 132 LoadTransformToCGContext(bitmap_context_, t); | |
| 133 t.setTranslateX(-t.getTranslateX()); | |
| 134 t.setTranslateY(-t.getTranslateY()); | |
| 135 LoadClippingRegionToCGContext(bitmap_context_, clip_region_, t); | |
| 136 } | |
| 137 | |
| 138 | |
| 139 // We use this static factory function instead of the regular constructor so | |
| 140 // that we can create the pixel data before calling the constructor. This is | |
| 141 // required so that we can call the base class' constructor with the pixel | |
| 142 // data. | |
| 143 BitmapPlatformDeviceMac* BitmapPlatformDeviceMac::Create(CGContextRef context, | |
| 144 int width, | |
| 145 int height, | |
| 146 bool is_opaque) { | |
| 147 void* data = malloc(height * width * 4); | |
| 148 if (!data) return NULL; | |
| 149 | |
| 150 SkBitmap bitmap; | |
| 151 bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height); | |
| 152 bitmap.setPixels(data); | |
| 153 | |
| 154 // Note: The Windows implementation clears the Bitmap later on. | |
| 155 // This bears mentioning since removal of this line makes the | |
| 156 // unit tests only fail periodically (or when MallocPreScribble is set). | |
| 157 bitmap.eraseARGB(0, 0, 0, 0); | |
| 158 | |
| 159 bitmap.setIsOpaque(is_opaque); | |
| 160 | |
| 161 if (is_opaque) { | |
| 162 #ifndef NDEBUG | |
| 163 // To aid in finding bugs, we set the background color to something | |
| 164 // obviously wrong so it will be noticable when it is not cleared | |
| 165 bitmap.eraseARGB(255, 0, 255, 128); // bright bluish green | |
| 166 #endif | |
| 167 } | |
| 168 | |
| 169 CGColorSpaceRef color_space = | |
| 170 CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); | |
| 171 // allocate a bitmap context with 4 components per pixel (RGBA): | |
| 172 CGContextRef bitmap_context = | |
| 173 CGBitmapContextCreate(data, width, height, 8, width*4, | |
| 174 color_space, kCGImageAlphaPremultipliedLast); | |
| 175 | |
| 176 // Change the coordinate system to match WebCore's | |
| 177 CGContextTranslateCTM(bitmap_context, 0, height); | |
| 178 CGContextScaleCTM(bitmap_context, 1.0, -1.0); | |
| 179 CGColorSpaceRelease(color_space); | |
| 180 | |
| 181 // The device object will take ownership of the graphics context. | |
| 182 return new BitmapPlatformDeviceMac( | |
| 183 new BitmapPlatformDeviceMacData(bitmap_context), bitmap); | |
| 184 } | |
| 185 | |
| 186 // The device will own the bitmap, which corresponds to also owning the pixel | |
| 187 // data. Therefore, we do not transfer ownership to the SkDevice's bitmap. | |
| 188 BitmapPlatformDeviceMac::BitmapPlatformDeviceMac( | |
| 189 BitmapPlatformDeviceMacData* data, const SkBitmap& bitmap) | |
| 190 : PlatformDeviceMac(bitmap), | |
| 191 data_(data) { | |
| 192 } | |
| 193 | |
| 194 // The copy constructor just adds another reference to the underlying data. | |
| 195 // We use a const cast since the default Skia definitions don't define the | |
| 196 // proper constedness that we expect (accessBitmap should really be const). | |
| 197 BitmapPlatformDeviceMac::BitmapPlatformDeviceMac( | |
| 198 const BitmapPlatformDeviceMac& other) | |
| 199 : PlatformDeviceMac( | |
| 200 const_cast<BitmapPlatformDeviceMac&>(other).accessBitmap(true)), | |
| 201 data_(other.data_) { | |
| 202 } | |
| 203 | |
| 204 BitmapPlatformDeviceMac::~BitmapPlatformDeviceMac() { | |
| 205 } | |
| 206 | |
| 207 BitmapPlatformDeviceMac& BitmapPlatformDeviceMac::operator=( | |
| 208 const BitmapPlatformDeviceMac& other) { | |
| 209 data_ = other.data_; | |
| 210 return *this; | |
| 211 } | |
| 212 | |
| 213 CGContextRef BitmapPlatformDeviceMac::GetBitmapContext() { | |
| 214 return data_->GetBitmapContext(); | |
| 215 } | |
| 216 | |
| 217 void BitmapPlatformDeviceMac::setMatrixClip(const SkMatrix& transform, | |
| 218 const SkRegion& region) { | |
| 219 data_->SetMatrixClip(transform, region); | |
| 220 } | |
| 221 | |
| 222 void BitmapPlatformDeviceMac::DrawToContext(CGContextRef context, int x, int y, | |
| 223 const CGRect* src_rect) { | |
| 224 bool created_dc = false; | |
| 225 if (!data_->bitmap_context_) { | |
| 226 created_dc = true; | |
| 227 GetBitmapContext(); | |
| 228 } | |
| 229 | |
| 230 // this should not make a copy of the bits, since we're not doing | |
| 231 // anything to trigger copy on write | |
| 232 CGImageRef image = CGBitmapContextCreateImage(data_->bitmap_context_); | |
| 233 CGRect bounds; | |
| 234 if (src_rect) { | |
| 235 bounds = *src_rect; | |
| 236 bounds.origin.x = x; | |
| 237 bounds.origin.y = y; | |
| 238 CGImageRef sub_image = CGImageCreateWithImageInRect(image, *src_rect); | |
| 239 CGContextDrawImage(context, bounds, sub_image); | |
| 240 CGImageRelease(sub_image); | |
| 241 } else { | |
| 242 bounds.origin.x = 0; | |
| 243 bounds.origin.y = 0; | |
| 244 bounds.size.width = width(); | |
| 245 bounds.size.height = height(); | |
| 246 CGContextDrawImage(context, bounds, image); | |
| 247 } | |
| 248 CGImageRelease(image); | |
| 249 | |
| 250 if (created_dc) | |
| 251 data_->ReleaseBitmapContext(); | |
| 252 } | |
| 253 | |
| 254 // Returns the color value at the specified location. | |
| 255 SkColor BitmapPlatformDeviceMac::getColorAt(int x, int y) { | |
| 256 const SkBitmap& bitmap = accessBitmap(true); | |
| 257 SkAutoLockPixels lock(bitmap); | |
| 258 uint32_t* data = bitmap.getAddr32(0, 0); | |
| 259 return static_cast<SkColor>(data[x + y * width()]); | |
| 260 } | |
| 261 | |
| 262 void BitmapPlatformDeviceMac::onAccessBitmap(SkBitmap*) { | |
| 263 // Not needed in CoreGraphics | |
| 264 } | |
| 265 | |
| 266 void BitmapPlatformDeviceMac::processPixels(int x, int y, | |
| 267 int width, int height, | |
| 268 adjustAlpha adjustor) { | |
| 269 const SkBitmap& bitmap = accessBitmap(true); | |
| 270 SkMatrix& matrix = data_->transform_; | |
| 271 int bitmap_start_x = SkScalarRound(matrix.getTranslateX()) + x; | |
| 272 int bitmap_start_y = SkScalarRound(matrix.getTranslateY()) + y; | |
| 273 | |
| 274 SkAutoLockPixels lock(bitmap); | |
| 275 if (Constrain(bitmap.width(), &bitmap_start_x, &width) && | |
| 276 Constrain(bitmap.height(), &bitmap_start_y, &height)) { | |
| 277 uint32_t* data = bitmap.getAddr32(0, 0); | |
| 278 size_t row_words = bitmap.rowBytes() / 4; | |
| 279 for (int i = 0; i < height; i++) { | |
| 280 size_t offset = (i + bitmap_start_y) * row_words + bitmap_start_x; | |
| 281 for (int j = 0; j < width; j++) { | |
| 282 adjustor(data + offset + j); | |
| 283 } | |
| 284 } | |
| 285 } | |
| 286 } | |
| 287 | |
| 288 } // namespace gfx | |
| 289 | |
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Chromium Code Reviews
Issue 11244:
Move PlatformCanvas and PlatformDevice from base/gfx to webkit/port. I left h... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/