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| 1 // Copyright (c) 2012 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 "skia/ext/bitmap_platform_device_mac.h" | |
| 6 | |
| 7 #import <ApplicationServices/ApplicationServices.h> | |
| 8 #include <time.h> | |
| 9 | |
| 10 #include "base/mac/mac_util.h" | |
| 11 #include "base/memory/ref_counted.h" | |
| 12 #include "skia/ext/bitmap_platform_device.h" | |
| 13 #include "skia/ext/platform_canvas.h" | |
| 14 #include "skia/ext/skia_utils_mac.h" | |
| 15 #include "third_party/skia/include/core/SkMatrix.h" | |
| 16 #include "third_party/skia/include/core/SkPath.h" | |
| 17 #include "third_party/skia/include/core/SkRegion.h" | |
| 18 #include "third_party/skia/include/core/SkTypes.h" | |
| 19 #include "third_party/skia/include/core/SkUtils.h" | |
| 20 | |
| 21 namespace skia { | |
| 22 | |
| 23 namespace { | |
| 24 | |
| 25 static CGContextRef CGContextForData(void* data, int width, int height) { | |
| 26 #define HAS_ARGB_SHIFTS(a, r, g, b) \ | |
| 27 (SK_A32_SHIFT == (a) && SK_R32_SHIFT == (r) \ | |
| 28 && SK_G32_SHIFT == (g) && SK_B32_SHIFT == (b)) | |
| 29 #if defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0) | |
| 30 // Allocate a bitmap context with 4 components per pixel (BGRA). Apple | |
| 31 // recommends these flags for improved CG performance. | |
| 32 | |
| 33 // CGBitmapContextCreate returns NULL if width/height are 0. However, our | |
| 34 // callers expect to get a canvas back (which they later resize/reallocate) | |
| 35 // so we pin the dimensions here. | |
| 36 width = SkMax32(1, width); | |
| 37 height = SkMax32(1, height); | |
| 38 CGContextRef context = | |
| 39 CGBitmapContextCreate(data, width, height, 8, width * 4, | |
| 40 base::mac::GetSystemColorSpace(), | |
| 41 kCGImageAlphaPremultipliedFirst | | |
| 42 kCGBitmapByteOrder32Host); | |
| 43 #else | |
| 44 #error We require that Skia's and CoreGraphics's recommended \ | |
| 45 image memory layout match. | |
| 46 #endif | |
| 47 #undef HAS_ARGB_SHIFTS | |
| 48 | |
| 49 if (!context) | |
| 50 return NULL; | |
| 51 | |
| 52 // Change the coordinate system to match WebCore's | |
| 53 CGContextTranslateCTM(context, 0, height); | |
| 54 CGContextScaleCTM(context, 1.0, -1.0); | |
| 55 | |
| 56 return context; | |
| 57 } | |
| 58 | |
| 59 } // namespace | |
| 60 | |
| 61 void BitmapPlatformDevice::ReleaseBitmapContext() { | |
| 62 SkASSERT(bitmap_context_); | |
| 63 CGContextRelease(bitmap_context_); | |
| 64 bitmap_context_ = NULL; | |
| 65 } | |
| 66 | |
| 67 void BitmapPlatformDevice::SetMatrixClip( | |
| 68 const SkMatrix& transform, | |
| 69 const SkRegion& region) { | |
| 70 transform_ = transform; | |
| 71 clip_region_ = region; | |
| 72 config_dirty_ = true; | |
| 73 } | |
| 74 | |
| 75 // Loads the specified Skia transform into the device context | |
| 76 static void LoadTransformToCGContext(CGContextRef context, | |
| 77 const SkMatrix& matrix) { | |
| 78 // CoreGraphics can concatenate transforms, but not reset the current one. | |
| 79 // So in order to get the required behavior here, we need to first make | |
| 80 // the current transformation matrix identity and only then load the new one. | |
| 81 | |
| 82 // Reset matrix to identity. | |
| 83 CGAffineTransform orig_cg_matrix = CGContextGetCTM(context); | |
| 84 CGAffineTransform orig_cg_matrix_inv = | |
| 85 CGAffineTransformInvert(orig_cg_matrix); | |
| 86 CGContextConcatCTM(context, orig_cg_matrix_inv); | |
| 87 | |
| 88 // assert that we have indeed returned to the identity Matrix. | |
| 89 SkASSERT(CGAffineTransformIsIdentity(CGContextGetCTM(context))); | |
| 90 | |
| 91 // Convert xform to CG-land. | |
| 92 // Our coordinate system is flipped to match WebKit's so we need to modify | |
| 93 // the xform to match that. | |
| 94 SkMatrix transformed_matrix = matrix; | |
| 95 SkScalar sy = -matrix.getScaleY(); | |
| 96 transformed_matrix.setScaleY(sy); | |
| 97 size_t height = CGBitmapContextGetHeight(context); | |
| 98 SkScalar ty = -matrix.getTranslateY(); // y axis is flipped. | |
| 99 transformed_matrix.setTranslateY(ty + (SkScalar)height); | |
| 100 | |
| 101 CGAffineTransform cg_matrix = | |
| 102 gfx::SkMatrixToCGAffineTransform(transformed_matrix); | |
| 103 | |
| 104 // Load final transform into context. | |
| 105 CGContextConcatCTM(context, cg_matrix); | |
| 106 } | |
| 107 | |
| 108 // Loads a SkRegion into the CG context. | |
| 109 static void LoadClippingRegionToCGContext(CGContextRef context, | |
| 110 const SkRegion& region, | |
| 111 const SkMatrix& transformation) { | |
| 112 if (region.isEmpty()) { | |
| 113 // region can be empty, in which case everything will be clipped. | |
| 114 SkRect rect; | |
| 115 rect.setEmpty(); | |
| 116 CGContextClipToRect(context, gfx::SkRectToCGRect(rect)); | |
| 117 } else if (region.isRect()) { | |
| 118 // CoreGraphics applies the current transform to clip rects, which is | |
| 119 // unwanted. Inverse-transform the rect before sending it to CG. This only | |
| 120 // works for translations and scaling, but not for rotations (but the | |
| 121 // viewport is never rotated anyway). | |
| 122 SkMatrix t; | |
| 123 bool did_invert = transformation.invert(&t); | |
| 124 if (!did_invert) | |
| 125 t.reset(); | |
| 126 // Do the transformation. | |
| 127 SkRect rect; | |
| 128 rect.set(region.getBounds()); | |
| 129 t.mapRect(&rect); | |
| 130 SkIRect irect; | |
| 131 rect.round(&irect); | |
| 132 CGContextClipToRect(context, gfx::SkIRectToCGRect(irect)); | |
| 133 } else { | |
| 134 // It is complex. | |
| 135 SkPath path; | |
| 136 region.getBoundaryPath(&path); | |
| 137 // Clip. Note that windows clipping regions are not affected by the | |
| 138 // transform so apply it manually. | |
| 139 path.transform(transformation); | |
| 140 // TODO(playmobil): Implement. | |
| 141 SkASSERT(false); | |
| 142 // LoadPathToDC(context, path); | |
| 143 // hrgn = PathToRegion(context); | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 void BitmapPlatformDevice::LoadConfig() { | |
| 148 if (!config_dirty_ || !bitmap_context_) | |
| 149 return; // Nothing to do. | |
| 150 config_dirty_ = false; | |
| 151 | |
| 152 // We must restore and then save the state of the graphics context since the | |
| 153 // calls to Load the clipping region to the context are strictly cummulative, | |
| 154 // i.e., you can't replace a clip rect, other than with a save/restore. | |
| 155 // But this implies that no other changes to the state are done elsewhere. | |
| 156 // If we ever get to need to change this, then we must replace the clip rect | |
| 157 // calls in LoadClippingRegionToCGContext() with an image mask instead. | |
| 158 CGContextRestoreGState(bitmap_context_); | |
| 159 CGContextSaveGState(bitmap_context_); | |
| 160 LoadTransformToCGContext(bitmap_context_, transform_); | |
| 161 LoadClippingRegionToCGContext(bitmap_context_, clip_region_, transform_); | |
| 162 } | |
| 163 | |
| 164 | |
| 165 // We use this static factory function instead of the regular constructor so | |
| 166 // that we can create the pixel data before calling the constructor. This is | |
| 167 // required so that we can call the base class' constructor with the pixel | |
| 168 // data. | |
| 169 BitmapPlatformDevice* BitmapPlatformDevice::Create(CGContextRef context, | |
| 170 int width, | |
| 171 int height, | |
| 172 bool is_opaque, | |
| 173 bool do_clear) { | |
| 174 if (RasterDeviceTooBigToAllocate(width, height)) | |
| 175 return NULL; | |
| 176 | |
| 177 SkBitmap bitmap; | |
| 178 // TODO: verify that the CG Context's pixels will have tight rowbytes or pass
in the correct | |
| 179 // rowbytes for the case when context != NULL. | |
| 180 bitmap.setInfo(SkImageInfo::MakeN32(width, height, is_opaque ? kOpaque_SkAlpha
Type : kPremul_SkAlphaType)); | |
| 181 | |
| 182 void* data; | |
| 183 if (context) { | |
| 184 data = CGBitmapContextGetData(context); | |
| 185 bitmap.setPixels(data); | |
| 186 } else { | |
| 187 if (!bitmap.tryAllocPixels()) | |
| 188 return NULL; | |
| 189 data = bitmap.getPixels(); | |
| 190 } | |
| 191 if (do_clear) | |
| 192 memset(data, 0, bitmap.getSafeSize()); | |
| 193 | |
| 194 // If we were given data, then don't clobber it! | |
| 195 #ifndef NDEBUG | |
| 196 if (!context && is_opaque) { | |
| 197 // To aid in finding bugs, we set the background color to something | |
| 198 // obviously wrong so it will be noticable when it is not cleared | |
| 199 bitmap.eraseARGB(255, 0, 255, 128); // bright bluish green | |
| 200 } | |
| 201 #endif | |
| 202 | |
| 203 if (!context) { | |
| 204 context = CGContextForData(data, width, height); | |
| 205 if (!context) | |
| 206 return NULL; | |
| 207 } else | |
| 208 CGContextRetain(context); | |
| 209 | |
| 210 BitmapPlatformDevice* rv = new BitmapPlatformDevice(context, bitmap); | |
| 211 | |
| 212 // The device object took ownership of the graphics context with its own | |
| 213 // CGContextRetain call. | |
| 214 CGContextRelease(context); | |
| 215 | |
| 216 return rv; | |
| 217 } | |
| 218 | |
| 219 BitmapPlatformDevice* BitmapPlatformDevice::CreateWithData(uint8_t* data, | |
| 220 int width, | |
| 221 int height, | |
| 222 bool is_opaque) { | |
| 223 CGContextRef context = NULL; | |
| 224 if (data) | |
| 225 context = CGContextForData(data, width, height); | |
| 226 | |
| 227 BitmapPlatformDevice* rv = Create(context, width, height, is_opaque, false); | |
| 228 | |
| 229 // The device object took ownership of the graphics context with its own | |
| 230 // CGContextRetain call. | |
| 231 if (context) | |
| 232 CGContextRelease(context); | |
| 233 | |
| 234 return rv; | |
| 235 } | |
| 236 | |
| 237 // The device will own the bitmap, which corresponds to also owning the pixel | |
| 238 // data. Therefore, we do not transfer ownership to the SkBitmapDevice's bitmap. | |
| 239 BitmapPlatformDevice::BitmapPlatformDevice( | |
| 240 CGContextRef context, const SkBitmap& bitmap) | |
| 241 : SkBitmapDevice(bitmap), | |
| 242 bitmap_context_(context), | |
| 243 config_dirty_(true), // Want to load the config next time. | |
| 244 transform_(SkMatrix::I()) { | |
| 245 SetPlatformDevice(this, this); | |
| 246 SkASSERT(bitmap_context_); | |
| 247 // Initialize the clip region to the entire bitmap. | |
| 248 | |
| 249 SkIRect rect; | |
| 250 rect.set(0, 0, | |
| 251 CGBitmapContextGetWidth(bitmap_context_), | |
| 252 CGBitmapContextGetHeight(bitmap_context_)); | |
| 253 clip_region_ = SkRegion(rect); | |
| 254 CGContextRetain(bitmap_context_); | |
| 255 // We must save the state once so that we can use the restore/save trick | |
| 256 // in LoadConfig(). | |
| 257 CGContextSaveGState(bitmap_context_); | |
| 258 } | |
| 259 | |
| 260 BitmapPlatformDevice::~BitmapPlatformDevice() { | |
| 261 if (bitmap_context_) | |
| 262 CGContextRelease(bitmap_context_); | |
| 263 } | |
| 264 | |
| 265 CGContextRef BitmapPlatformDevice::GetBitmapContext() { | |
| 266 LoadConfig(); | |
| 267 return bitmap_context_; | |
| 268 } | |
| 269 | |
| 270 void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform, | |
| 271 const SkRegion& region, | |
| 272 const SkClipStack&) { | |
| 273 SetMatrixClip(transform, region); | |
| 274 } | |
| 275 | |
| 276 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& cinfo, | |
| 277 const SkPaint*) { | |
| 278 const SkImageInfo& info = cinfo.fInfo; | |
| 279 const bool do_clear = !info.isOpaque(); | |
| 280 SkASSERT(info.colorType() == kN32_SkColorType); | |
| 281 return Create(NULL, info.width(), info.height(), info.isOpaque(), do_clear); | |
| 282 } | |
| 283 | |
| 284 // PlatformCanvas impl | |
| 285 | |
| 286 SkCanvas* CreatePlatformCanvas(CGContextRef ctx, int width, int height, | |
| 287 bool is_opaque, OnFailureType failureType) { | |
| 288 const bool do_clear = false; | |
| 289 skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef( | |
| 290 BitmapPlatformDevice::Create(ctx, width, height, is_opaque, do_clear)); | |
| 291 return CreateCanvas(dev, failureType); | |
| 292 } | |
| 293 | |
| 294 SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque, | |
| 295 uint8_t* data, OnFailureType failureType) { | |
| 296 skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef( | |
| 297 BitmapPlatformDevice::CreateWithData(data, width, height, is_opaque)); | |
| 298 return CreateCanvas(dev, failureType); | |
| 299 } | |
| 300 | |
| 301 // Port of PlatformBitmap to mac | |
| 302 | |
| 303 PlatformBitmap::~PlatformBitmap() { | |
| 304 if (surface_) | |
| 305 CGContextRelease(surface_); | |
| 306 } | |
| 307 | |
| 308 bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) { | |
| 309 if (RasterDeviceTooBigToAllocate(width, height)) | |
| 310 return false; | |
| 311 | |
| 312 if (!bitmap_.tryAllocN32Pixels(width, height, is_opaque)) | |
| 313 return false; | |
| 314 | |
| 315 if (!is_opaque) | |
| 316 bitmap_.eraseColor(0); | |
| 317 | |
| 318 surface_ = CGContextForData(bitmap_.getPixels(), bitmap_.width(), | |
| 319 bitmap_.height()); | |
| 320 return true; | |
| 321 } | |
| 322 | |
| 323 } // namespace skia | |
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Chromium Code Reviews
Issue 2011713003:
Roll skia to 8cc209111876b7c78b5ec577c9221d8ed5e21024 (Closed)
Base URL: git@github.com:domokit/mojo.git@master