gfx/2d/DrawTarget.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "2D.h"
   8 #include "Blur.h"
   9 #include "Logging.h"
  10 #include "PathHelpers.h"
  11 #include "SourceSurfaceRawData.h"
  12 #include "Tools.h"
  13
  14 #include "BufferEdgePad.h"
  15 #include "BufferUnrotate.h"
  16
  17 #ifdef USE_NEON
  18 #  include "mozilla/arm.h"
  19 #  include "LuminanceNEON.h"
  20 #endif
  21
  22 namespace mozilla {
  23 namespace gfx {
  24
  25 /**
  26  * Byte offsets of channels in a native packed gfxColor or cairo image surface.
  27  */
  28 #ifdef IS_BIG_ENDIAN
  29 #  define GFX_ARGB32_OFFSET_A 0
  30 #  define GFX_ARGB32_OFFSET_R 1
  31 #  define GFX_ARGB32_OFFSET_G 2
  32 #  define GFX_ARGB32_OFFSET_B 3
  33 #else
  34 #  define GFX_ARGB32_OFFSET_A 3
  35 #  define GFX_ARGB32_OFFSET_R 2
  36 #  define GFX_ARGB32_OFFSET_G 1
  37 #  define GFX_ARGB32_OFFSET_B 0
  38 #endif
  39
  40 // c = n / 255
  41 // c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5
  42 static const uint8_t gsRGBToLinearRGBMap[256] = {
  43     0,   0,   0,   0,   0,   0,   0,   1,   1,   1,   1,   1,   1,   1,   1,
  44     1,   1,   1,   2,   2,   2,   2,   2,   2,   2,   2,   3,   3,   3,   3,
  45     3,   3,   4,   4,   4,   4,   4,   5,   5,   5,   5,   6,   6,   6,   6,
  46     7,   7,   7,   8,   8,   8,   8,   9,   9,   9,   10,  10,  10,  11,  11,
  47     12,  12,  12,  13,  13,  13,  14,  14,  15,  15,  16,  16,  17,  17,  17,
  48     18,  18,  19,  19,  20,  20,  21,  22,  22,  23,  23,  24,  24,  25,  25,
  49     26,  27,  27,  28,  29,  29,  30,  30,  31,  32,  32,  33,  34,  35,  35,
  50     36,  37,  37,  38,  39,  40,  41,  41,  42,  43,  44,  45,  45,  46,  47,
  51     48,  49,  50,  51,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,
  52     62,  63,  64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  76,  77,
  53     78,  79,  80,  81,  82,  84,  85,  86,  87,  88,  90,  91,  92,  93,  95,
  54     96,  97,  99,  100, 101, 103, 104, 105, 107, 108, 109, 111, 112, 114, 115,
  55     116, 118, 119, 121, 122, 124, 125, 127, 128, 130, 131, 133, 134, 136, 138,
  56     139, 141, 142, 144, 146, 147, 149, 151, 152, 154, 156, 157, 159, 161, 163,
  57     164, 166, 168, 170, 171, 173, 175, 177, 179, 181, 183, 184, 186, 188, 190,
  58     192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220,
  59     222, 224, 226, 229, 231, 233, 235, 237, 239, 242, 244, 246, 248, 250, 253,
  60     255};
  61
  62 static void ComputesRGBLuminanceMask(const uint8_t* aSourceData,
  63                                      int32_t aSourceStride, uint8_t* aDestData,
  64                                      int32_t aDestStride, const IntSize& aSize,
  65                                      float aOpacity) {
  66 #ifdef USE_NEON
  67   if (mozilla::supports_neon()) {
  68     ComputesRGBLuminanceMask_NEON(aSourceData, aSourceStride, aDestData,
  69                                   aDestStride, aSize, aOpacity);
  70     return;
  71   }
  72 #endif
  73
  74   int32_t redFactor = 55 * aOpacity;     // 255 * 0.2125 * opacity
  75   int32_t greenFactor = 183 * aOpacity;  // 255 * 0.7154 * opacity
  76   int32_t blueFactor = 18 * aOpacity;    // 255 * 0.0721
  77   int32_t sourceOffset = aSourceStride - 4 * aSize.width;
  78   const uint8_t* sourcePixel = aSourceData;
  79   int32_t destOffset = aDestStride - aSize.width;
  80   uint8_t* destPixel = aDestData;
  81
  82   for (int32_t y = 0; y < aSize.height; y++) {
  83     for (int32_t x = 0; x < aSize.width; x++) {
  84       uint8_t a = sourcePixel[GFX_ARGB32_OFFSET_A];
  85
  86       if (a) {
  87         *destPixel = (redFactor * sourcePixel[GFX_ARGB32_OFFSET_R] +
  88                       greenFactor * sourcePixel[GFX_ARGB32_OFFSET_G] +
  89                       blueFactor * sourcePixel[GFX_ARGB32_OFFSET_B]) >>
  90                      8;
  91       } else {
  92         *destPixel = 0;
  93       }
  94       sourcePixel += 4;
  95       destPixel++;
  96     }
  97     sourcePixel += sourceOffset;
  98     destPixel += destOffset;
  99   }
 100 }
 101
 102 static void ComputeLinearRGBLuminanceMask(
 103     const uint8_t* aSourceData, int32_t aSourceStride, uint8_t* aDestData,
 104     int32_t aDestStride, const IntSize& aSize, float aOpacity) {
 105   int32_t redFactor = 55 * aOpacity;     // 255 * 0.2125 * opacity
 106   int32_t greenFactor = 183 * aOpacity;  // 255 * 0.7154 * opacity
 107   int32_t blueFactor = 18 * aOpacity;    // 255 * 0.0721
 108   int32_t sourceOffset = aSourceStride - 4 * aSize.width;
 109   const uint8_t* sourcePixel = aSourceData;
 110   int32_t destOffset = aDestStride - aSize.width;
 111   uint8_t* destPixel = aDestData;
 112
 113   for (int32_t y = 0; y < aSize.height; y++) {
 114     for (int32_t x = 0; x < aSize.width; x++) {
 115       uint8_t a = sourcePixel[GFX_ARGB32_OFFSET_A];
 116
 117       // unpremultiply
 118       if (a) {
 119         if (a == 255) {
 120           /* sRGB -> linearRGB -> intensity */
 121           *destPixel = static_cast<uint8_t>(
 122               (gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_R]] *
 123                    redFactor +
 124                gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_G]] *
 125                    greenFactor +
 126                gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_B]] *
 127                    blueFactor) >>
 128               8);
 129         } else {
 130           uint8_t tempPixel[4];
 131           tempPixel[GFX_ARGB32_OFFSET_B] =
 132               (255 * sourcePixel[GFX_ARGB32_OFFSET_B]) / a;
 133           tempPixel[GFX_ARGB32_OFFSET_G] =
 134               (255 * sourcePixel[GFX_ARGB32_OFFSET_G]) / a;
 135           tempPixel[GFX_ARGB32_OFFSET_R] =
 136               (255 * sourcePixel[GFX_ARGB32_OFFSET_R]) / a;
 137
 138           /* sRGB -> linearRGB -> intensity */
 139           *destPixel = static_cast<uint8_t>(
 140               ((gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_R]] *
 141                     redFactor +
 142                 gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_G]] *
 143                     greenFactor +
 144                 gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_B]] *
 145                     blueFactor) >>
 146                8) *
 147               (a / 255.0f));
 148         }
 149       } else {
 150         *destPixel = 0;
 151       }
 152       sourcePixel += 4;
 153       destPixel++;
 154     }
 155     sourcePixel += sourceOffset;
 156     destPixel += destOffset;
 157   }
 158 }
 159
 160 void DrawTarget::PushDeviceSpaceClipRects(const IntRect* aRects,
 161                                           uint32_t aCount) {
 162   Matrix oldTransform = GetTransform();
 163   SetTransform(Matrix());
 164
 165   RefPtr<PathBuilder> pathBuilder = CreatePathBuilder();
 166   for (uint32_t i = 0; i < aCount; i++) {
 167     AppendRectToPath(pathBuilder, Rect(aRects[i]));
 168   }
 169   RefPtr<Path> path = pathBuilder->Finish();
 170   PushClip(path);
 171
 172   SetTransform(oldTransform);
 173 }
 174
 175 void DrawTarget::FillRoundedRect(const RoundedRect& aRect,
 176                                  const Pattern& aPattern,
 177                                  const DrawOptions& aOptions) {
 178   RefPtr<Path> path = MakePathForRoundedRect(*this, aRect.rect, aRect.corners);
 179   Fill(path, aPattern, aOptions);
 180 }
 181
 182 void DrawTarget::StrokeCircle(const Point& aOrigin, float radius,
 183                               const Pattern& aPattern,
 184                               const StrokeOptions& aStrokeOptions,
 185                               const DrawOptions& aOptions) {
 186   RefPtr<Path> path = MakePathForCircle(*this, aOrigin, radius);
 187   Stroke(path, aPattern, aStrokeOptions, aOptions);
 188 }
 189
 190 void DrawTarget::FillCircle(const Point& aOrigin, float radius,
 191                             const Pattern& aPattern,
 192                             const DrawOptions& aOptions) {
 193   RefPtr<Path> path = MakePathForCircle(*this, aOrigin, radius);
 194   Fill(path, aPattern, aOptions);
 195 }
 196
 197 void DrawTarget::StrokeGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
 198                               const Pattern& aPattern,
 199                               const StrokeOptions& aStrokeOptions,
 200                               const DrawOptions& aOptions) {
 201   if (RefPtr<Path> path = aFont->GetPathForGlyphs(aBuffer, this)) {
 202     Stroke(path, aPattern, aStrokeOptions, aOptions);
 203   }
 204 }
 205
 206 already_AddRefed<SourceSurface> DrawTarget::IntoLuminanceSource(
 207     LuminanceType aMaskType, float aOpacity) {
 208   // The default IntoLuminanceSource implementation needs a format of B8G8R8A8.
 209   if (mFormat != SurfaceFormat::B8G8R8A8) {
 210     return nullptr;
 211   }
 212
 213   RefPtr<SourceSurface> surface = Snapshot();
 214   if (!surface) {
 215     return nullptr;
 216   }
 217
 218   IntSize size = surface->GetSize();
 219
 220   RefPtr<DataSourceSurface> maskSurface = surface->GetDataSurface();
 221   if (!maskSurface) {
 222     return nullptr;
 223   }
 224
 225   DataSourceSurface::MappedSurface map;
 226   if (!maskSurface->Map(DataSourceSurface::MapType::READ, &map)) {
 227     return nullptr;
 228   }
 229
 230   // Create alpha channel mask for output
 231   RefPtr<SourceSurfaceAlignedRawData> destMaskSurface =
 232       new SourceSurfaceAlignedRawData;
 233   if (!destMaskSurface->Init(size, SurfaceFormat::A8, false, 0)) {
 234     return nullptr;
 235   }
 236   DataSourceSurface::MappedSurface destMap;
 237   if (!destMaskSurface->Map(DataSourceSurface::MapType::WRITE, &destMap)) {
 238     return nullptr;
 239   }
 240
 241   switch (aMaskType) {
 242     case LuminanceType::LUMINANCE: {
 243       ComputesRGBLuminanceMask(map.mData, map.mStride, destMap.mData,
 244                                destMap.mStride, size, aOpacity);
 245       break;
 246     }
 247     case LuminanceType::LINEARRGB: {
 248       ComputeLinearRGBLuminanceMask(map.mData, map.mStride, destMap.mData,
 249                                     destMap.mStride, size, aOpacity);
 250       break;
 251     }
 252   }
 253
 254   maskSurface->Unmap();
 255   destMaskSurface->Unmap();
 256
 257   return destMaskSurface.forget();
 258 }
 259
 260 void DrawTarget::Blur(const AlphaBoxBlur& aBlur) {
 261   uint8_t* data;
 262   IntSize size;
 263   int32_t stride;
 264   SurfaceFormat format;
 265   if (!LockBits(&data, &size, &stride, &format)) {
 266     gfxWarning() << "Cannot perform in-place blur on non-data DrawTarget";
 267     return;
 268   }
 269
 270   // Sanity check that the blur size matches the draw target.
 271   MOZ_ASSERT(size == aBlur.GetSize());
 272   MOZ_ASSERT(stride == aBlur.GetStride());
 273   aBlur.Blur(data);
 274
 275   ReleaseBits(data);
 276 }
 277
 278 void DrawTarget::PadEdges(const IntRegion& aRegion) {
 279   PadDrawTargetOutFromRegion(this, aRegion);
 280 }
 281
 282 bool DrawTarget::Unrotate(IntPoint aRotation) {
 283   unsigned char* data;
 284   IntSize size;
 285   int32_t stride;
 286   SurfaceFormat format;
 287
 288   if (LockBits(&data, &size, &stride, &format)) {
 289     uint8_t bytesPerPixel = BytesPerPixel(format);
 290     BufferUnrotate(data, size.width * bytesPerPixel, size.height, stride,
 291                    aRotation.x * bytesPerPixel, aRotation.y);
 292     ReleaseBits(data);
 293     return true;
 294   }
 295   return false;
 296 }
 297
 298 int32_t ShadowOptions::BlurRadius() const {
 299   return AlphaBoxBlur::CalculateBlurRadius(Point(mSigma, mSigma)).width;
 300 }
 301
 302 void DrawTarget::DrawShadow(const Path* aPath, const Pattern& aPattern,
 303                             const ShadowOptions& aShadow,
 304                             const DrawOptions& aOptions,
 305                             const StrokeOptions* aStrokeOptions) {
 306   // Get the approximate bounds of the source path
 307   Rect bounds = aPath->GetFastBounds(GetTransform(), aStrokeOptions);
 308   if (bounds.IsEmpty()) {
 309     return;
 310   }
 311   // Inflate the bounds by the blur radius
 312   bounds += aShadow.mOffset;
 313   int32_t blurRadius = aShadow.BlurRadius();
 314   bounds.Inflate(blurRadius);
 315   bounds.RoundOut();
 316   // Check if the bounds intersect the viewport
 317   Rect viewport(GetRect());
 318   viewport.Inflate(blurRadius);
 319   bounds = bounds.Intersect(viewport);
 320   IntRect intBounds;
 321   if (bounds.IsEmpty() || !bounds.ToIntRect(&intBounds) ||
 322       !CanCreateSimilarDrawTarget(intBounds.Size(), SurfaceFormat::A8)) {
 323     return;
 324   }
 325   // Create a draw target for drawing the shadow mask with enough room for blur
 326   RefPtr<DrawTarget> shadowTarget = CreateShadowDrawTarget(
 327       intBounds.Size(), SurfaceFormat::A8, aShadow.mSigma);
 328   if (shadowTarget) {
 329     // See bug 1524554.
 330     shadowTarget->ClearRect(Rect());
 331   }
 332   if (!shadowTarget || !shadowTarget->IsValid()) {
 333     return;
 334   }
 335   // Draw the path into the target for the initial shadow mask
 336   Point offset = Point(intBounds.TopLeft()) - aShadow.mOffset;
 337   shadowTarget->SetTransform(GetTransform().PostTranslate(-offset));
 338   DrawOptions shadowDrawOptions(
 339       aOptions.mAlpha, CompositionOp::OP_OVER,
 340       blurRadius > 1 ? AntialiasMode::NONE : aOptions.mAntialiasMode);
 341   if (aStrokeOptions) {
 342     shadowTarget->Stroke(aPath, aPattern, *aStrokeOptions, shadowDrawOptions);
 343   } else {
 344     shadowTarget->Fill(aPath, aPattern, shadowDrawOptions);
 345   }
 346   RefPtr<SourceSurface> snapshot = shadowTarget->Snapshot();
 347   // Finally, hand a snapshot of the mask to DrawSurfaceWithShadow for the
 348   // final shadow blur
 349   if (snapshot) {
 350     DrawSurfaceWithShadow(snapshot, offset, aShadow, aOptions.mCompositionOp);
 351   }
 352 }
 353
 354 }  // namespace gfx
 355 }  // namespace mozilla