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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 "config.h" | |
| 6 | |
| 7 #include <time.h> | |
| 8 | |
| 9 #include "SkMatrix.h" | |
| 10 #include "SkRegion.h" | |
| 11 #include "SkUtils.h" | |
| 12 | |
| 13 #include "base/gfx/bitmap_platform_device_mac.h" | |
| 14 #include "base/gfx/skia_utils_mac.h" | |
| 15 #include "base/logging.h" | |
| 16 | |
| 17 namespace gfx { | |
| 18 | |
| 19 namespace { | |
| 20 | |
| 21 // Constrains position and size to fit within available_size. If |size| is -1, | |
| 22 // all the |available_size| is used. Returns false if the position is out of | |
| 23 // |available_size|. | |
| 24 bool Constrain(int available_size, int* position, int *size) { | |
| 25 if (*size < -2) | |
| 26 return false; | |
| 27 | |
| 28 if (*position < 0) { | |
| 29 if (*size != -1) | |
| 30 *size += *position; | |
| 31 *position = 0; | |
| 32 } | |
| 33 if (*size == 0 || *position >= available_size) | |
| 34 return false; | |
| 35 | |
| 36 if (*size > 0) { | |
| 37 int overflow = (*position + *size) - available_size; | |
| 38 if (overflow > 0) { | |
| 39 *size -= overflow; | |
| 40 } | |
| 41 } else { | |
| 42 // Fill up available size. | |
| 43 *size = available_size - *position; | |
| 44 } | |
| 45 return true; | |
| 46 } | |
| 47 | |
| 48 } // namespace | |
| 49 | |
| 50 class BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData | |
| 51 : public base::RefCounted<BitmapPlatformDeviceMacData> { | |
| 52 public: | |
| 53 explicit BitmapPlatformDeviceMacData(CGContextRef bitmap); | |
| 54 | |
| 55 // Create/destroy CoreGraphics context for our bitmap data. | |
| 56 CGContextRef GetBitmapContext() { | |
| 57 LoadConfig(); | |
| 58 return bitmap_context_; | |
| 59 } | |
| 60 | |
| 61 void ReleaseBitmapContext() { | |
| 62 DCHECK(bitmap_context_); | |
| 63 CGContextRelease(bitmap_context_); | |
| 64 bitmap_context_ = NULL; | |
| 65 } | |
| 66 | |
| 67 // Sets the transform and clip operations. This will not update the CGContext, | |
| 68 // but will mark the config as dirty. The next call of LoadConfig will | |
| 69 // pick up these changes. | |
| 70 void SetMatrixClip(const SkMatrix& transform, const SkRegion& region); | |
| 71 | |
| 72 // Loads the current transform and clip into the DC. Can be called even when | |
| 73 // |bitmap_context_| is NULL (will be a NOP). | |
| 74 void LoadConfig(); | |
| 75 | |
| 76 // Lazily-created graphics context used to draw into the bitmap. | |
| 77 CGContextRef bitmap_context_; | |
| 78 | |
| 79 // True when there is a transform or clip that has not been set to the | |
| 80 // CGContext. The CGContext is retrieved for every text operation, and the | |
| 81 // transform and clip do not change as much. We can save time by not loading | |
| 82 // the clip and transform for every one. | |
| 83 bool config_dirty_; | |
| 84 | |
| 85 // Translation assigned to the CGContext: we need to keep track of this | |
| 86 // separately so it can be updated even if the CGContext isn't created yet. | |
| 87 SkMatrix transform_; | |
| 88 | |
| 89 // The current clipping | |
| 90 SkRegion clip_region_; | |
| 91 | |
| 92 private: | |
| 93 friend class base::RefCounted<BitmapPlatformDeviceMacData>; | |
| 94 ~BitmapPlatformDeviceMacData() { | |
| 95 if (bitmap_context_) | |
| 96 CGContextRelease(bitmap_context_); | |
| 97 } | |
| 98 | |
| 99 DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDeviceMacData); | |
| 100 }; | |
| 101 | |
| 102 BitmapPlatformDeviceMac::\ | |
| 103 BitmapPlatformDeviceMacData::BitmapPlatformDeviceMacData( | |
| 104 CGContextRef bitmap) | |
| 105 : bitmap_context_(bitmap), | |
| 106 config_dirty_(true) { // Want to load the config next time. | |
| 107 DCHECK(bitmap_context_); | |
| 108 // Initialize the clip region to the entire bitmap. | |
| 109 | |
| 110 SkIRect rect; | |
| 111 rect.set(0, 0, | |
| 112 CGBitmapContextGetWidth(bitmap_context_), | |
| 113 CGBitmapContextGetHeight(bitmap_context_)); | |
| 114 clip_region_ = SkRegion(rect); | |
| 115 transform_.reset(); | |
| 116 CGContextRetain(bitmap_context_); | |
| 117 } | |
| 118 | |
| 119 void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::SetMatrixClip( | |
| 120 const SkMatrix& transform, | |
| 121 const SkRegion& region) { | |
| 122 transform_ = transform; | |
| 123 clip_region_ = region; | |
| 124 config_dirty_ = true; | |
| 125 } | |
| 126 | |
| 127 void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::LoadConfig() { | |
| 128 if (!config_dirty_ || !bitmap_context_) | |
| 129 return; // Nothing to do. | |
| 130 config_dirty_ = false; | |
| 131 | |
| 132 // Transform. | |
| 133 SkMatrix t(transform_); | |
| 134 LoadTransformToCGContext(bitmap_context_, t); | |
| 135 t.setTranslateX(-t.getTranslateX()); | |
| 136 t.setTranslateY(-t.getTranslateY()); | |
| 137 LoadClippingRegionToCGContext(bitmap_context_, clip_region_, t); | |
| 138 } | |
| 139 | |
| 140 | |
| 141 // We use this static factory function instead of the regular constructor so | |
| 142 // that we can create the pixel data before calling the constructor. This is | |
| 143 // required so that we can call the base class' constructor with the pixel | |
| 144 // data. | |
| 145 BitmapPlatformDeviceMac* BitmapPlatformDeviceMac::Create(CGContextRef context, | |
| 146 int width, | |
| 147 int height, | |
| 148 bool is_opaque) { | |
| 149 void* data = malloc(height * width * 4); | |
| 150 if (!data) return NULL; | |
| 151 | |
| 152 SkBitmap bitmap; | |
| 153 bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height); | |
| 154 bitmap.setPixels(data); | |
| 155 | |
| 156 // Note: The Windows implementation clears the Bitmap later on. | |
| 157 // This bears mentioning since removal of this line makes the | |
| 158 // unit tests only fail periodically (or when MallocPreScribble is set). | |
| 159 bitmap.eraseARGB(0, 0, 0, 0); | |
| 160 | |
| 161 bitmap.setIsOpaque(is_opaque); | |
| 162 | |
| 163 if (is_opaque) { | |
| 164 #ifndef NDEBUG | |
| 165 // To aid in finding bugs, we set the background color to something | |
| 166 // obviously wrong so it will be noticable when it is not cleared | |
| 167 bitmap.eraseARGB(255, 0, 255, 128); // bright bluish green | |
| 168 #endif | |
| 169 } | |
| 170 | |
| 171 CGColorSpaceRef color_space = | |
| 172 CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); | |
| 173 // allocate a bitmap context with 4 components per pixel (RGBA): | |
| 174 CGContextRef bitmap_context = | |
| 175 CGBitmapContextCreate(data, width, height, 8, width*4, | |
| 176 color_space, kCGImageAlphaPremultipliedLast); | |
| 177 | |
| 178 // Change the coordinate system to match WebCore's | |
| 179 CGContextTranslateCTM(bitmap_context, 0, height); | |
| 180 CGContextScaleCTM(bitmap_context, 1.0, -1.0); | |
| 181 CGColorSpaceRelease(color_space); | |
| 182 | |
| 183 // The device object will take ownership of the graphics context. | |
| 184 return new BitmapPlatformDeviceMac( | |
| 185 new BitmapPlatformDeviceMacData(bitmap_context), bitmap); | |
| 186 } | |
| 187 | |
| 188 // The device will own the bitmap, which corresponds to also owning the pixel | |
| 189 // data. Therefore, we do not transfer ownership to the SkDevice's bitmap. | |
| 190 BitmapPlatformDeviceMac::BitmapPlatformDeviceMac( | |
| 191 BitmapPlatformDeviceMacData* data, const SkBitmap& bitmap) | |
| 192 : PlatformDeviceMac(bitmap), | |
| 193 data_(data) { | |
| 194 } | |
| 195 | |
| 196 // The copy constructor just adds another reference to the underlying data. | |
| 197 // We use a const cast since the default Skia definitions don't define the | |
| 198 // proper constedness that we expect (accessBitmap should really be const). | |
| 199 BitmapPlatformDeviceMac::BitmapPlatformDeviceMac( | |
| 200 const BitmapPlatformDeviceMac& other) | |
| 201 : PlatformDeviceMac( | |
| 202 const_cast<BitmapPlatformDeviceMac&>(other).accessBitmap(true)), | |
| 203 data_(other.data_) { | |
| 204 } | |
| 205 | |
| 206 BitmapPlatformDeviceMac::~BitmapPlatformDeviceMac() { | |
| 207 } | |
| 208 | |
| 209 BitmapPlatformDeviceMac& BitmapPlatformDeviceMac::operator=( | |
| 210 const BitmapPlatformDeviceMac& other) { | |
| 211 data_ = other.data_; | |
| 212 return *this; | |
| 213 } | |
| 214 | |
| 215 CGContextRef BitmapPlatformDeviceMac::GetBitmapContext() { | |
| 216 return data_->GetBitmapContext(); | |
| 217 } | |
| 218 | |
| 219 void BitmapPlatformDeviceMac::setMatrixClip(const SkMatrix& transform, | |
| 220 const SkRegion& region) { | |
| 221 data_->SetMatrixClip(transform, region); | |
| 222 } | |
| 223 | |
| 224 void BitmapPlatformDeviceMac::DrawToContext(CGContextRef context, int x, int y, | |
| 225 const CGRect* src_rect) { | |
| 226 bool created_dc = false; | |
| 227 if (!data_->bitmap_context_) { | |
| 228 created_dc = true; | |
| 229 GetBitmapContext(); | |
| 230 } | |
| 231 | |
| 232 // this should not make a copy of the bits, since we're not doing | |
| 233 // anything to trigger copy on write | |
| 234 CGImageRef image = CGBitmapContextCreateImage(data_->bitmap_context_); | |
| 235 CGRect bounds; | |
| 236 if (src_rect) { | |
| 237 bounds = *src_rect; | |
| 238 bounds.origin.x = x; | |
| 239 bounds.origin.y = y; | |
| 240 CGImageRef sub_image = CGImageCreateWithImageInRect(image, *src_rect); | |
| 241 CGContextDrawImage(context, bounds, sub_image); | |
| 242 CGImageRelease(sub_image); | |
| 243 } else { | |
| 244 bounds.origin.x = 0; | |
| 245 bounds.origin.y = 0; | |
| 246 bounds.size.width = width(); | |
| 247 bounds.size.height = height(); | |
| 248 CGContextDrawImage(context, bounds, image); | |
| 249 } | |
| 250 CGImageRelease(image); | |
| 251 | |
| 252 if (created_dc) | |
| 253 data_->ReleaseBitmapContext(); | |
| 254 } | |
| 255 | |
| 256 // Returns the color value at the specified location. | |
| 257 SkColor BitmapPlatformDeviceMac::getColorAt(int x, int y) { | |
| 258 const SkBitmap& bitmap = accessBitmap(true); | |
| 259 SkAutoLockPixels lock(bitmap); | |
| 260 uint32_t* data = bitmap.getAddr32(0, 0); | |
| 261 return static_cast<SkColor>(data[x + y * width()]); | |
| 262 } | |
| 263 | |
| 264 void BitmapPlatformDeviceMac::onAccessBitmap(SkBitmap*) { | |
| 265 // Not needed in CoreGraphics | |
| 266 } | |
| 267 | |
| 268 void BitmapPlatformDeviceMac::processPixels(int x, int y, | |
| 269 int width, int height, | |
| 270 adjustAlpha adjustor) { | |
| 271 const SkBitmap& bitmap = accessBitmap(true); | |
| 272 SkMatrix& matrix = data_->transform_; | |
| 273 int bitmap_start_x = SkScalarRound(matrix.getTranslateX()) + x; | |
| 274 int bitmap_start_y = SkScalarRound(matrix.getTranslateY()) + y; | |
| 275 | |
| 276 SkAutoLockPixels lock(bitmap); | |
| 277 if (Constrain(bitmap.width(), &bitmap_start_x, &width) && | |
| 278 Constrain(bitmap.height(), &bitmap_start_y, &height)) { | |
| 279 uint32_t* data = bitmap.getAddr32(0, 0); | |
| 280 size_t row_words = bitmap.rowBytes() / 4; | |
| 281 for (int i = 0; i < height; i++) { | |
| 282 size_t offset = (i + bitmap_start_y) * row_words + bitmap_start_x; | |
| 283 for (int j = 0; j < width; j++) { | |
| 284 adjustor(data + offset + j); | |
| 285 } | |
| 286 } | |
| 287 } | |
| 288 } | |
| 289 | |
| 290 } // namespace gfx | |
| 291 | |
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Chromium Code Reviews
Issue 11357:
Move the platform files form port to skia for Mac only. Hopefully this won't ... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/