gfx/2d/HelpersSkia.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef MOZILLA_GFX_HELPERSSKIA_H_
   7 #define MOZILLA_GFX_HELPERSSKIA_H_
   8
   9 #include "2D.h"
  10 #include "skia/SkCanvas.h"
  11 #include "skia/SkDashPathEffect.h"
  12 #include "skia/SkShader.h"
  13 #ifdef USE_SKIA_GPU
  14 #include "skia/GrTypes.h"
  15 #endif
  16 #include "mozilla/Assertions.h"
  17 #include <vector>
  18
  19 namespace mozilla {
  20 namespace gfx {
  21
  22 static inline SkBitmap::Config
  23 GfxFormatToSkiaConfig(SurfaceFormat format)
  24 {
  25   switch (format)
  26   {
  27     case FORMAT_B8G8R8A8:
  28       return SkBitmap::kARGB_8888_Config;
  29     case FORMAT_B8G8R8X8:
  30       // We probably need to do something here.
  31       return SkBitmap::kARGB_8888_Config;
  32     case FORMAT_R5G6B5:
  33       return SkBitmap::kRGB_565_Config;
  34     case FORMAT_A8:
  35       return SkBitmap::kA8_Config;
  36     default:
  37       return SkBitmap::kARGB_8888_Config;
  38   }
  39 }
  40
  41 static inline SurfaceFormat
  42 SkiaConfigToGfxFormat(SkBitmap::Config config)
  43 {
  44   switch (config)
  45   {
  46     case SkBitmap::kARGB_8888_Config:
  47       return FORMAT_B8G8R8A8;
  48     case SkBitmap::kRGB_565_Config:
  49       return FORMAT_R5G6B5;
  50     case SkBitmap::kA8_Config:
  51       return FORMAT_A8;
  52     default:
  53       return FORMAT_B8G8R8A8;
  54   }
  55 }
  56
  57 #ifdef USE_SKIA_GPU
  58 static inline GrPixelConfig
  59 GfxFormatToGrConfig(SurfaceFormat format)
  60 {
  61   switch (format)
  62   {
  63     case FORMAT_B8G8R8A8:
  64       return kBGRA_8888_GrPixelConfig;
  65     case FORMAT_B8G8R8X8:
  66       // We probably need to do something here.
  67       return kBGRA_8888_GrPixelConfig;
  68     case FORMAT_R5G6B5:
  69       return kRGB_565_GrPixelConfig;
  70     case FORMAT_A8:
  71       return kAlpha_8_GrPixelConfig;
  72     default:
  73       return kRGBA_8888_GrPixelConfig;
  74   }
  75
  76 }
  77 #endif
  78 static inline void
  79 GfxMatrixToSkiaMatrix(const Matrix& mat, SkMatrix& retval)
  80 {
  81     retval.setAll(SkFloatToScalar(mat._11), SkFloatToScalar(mat._21), SkFloatToScalar(mat._31),
  82                   SkFloatToScalar(mat._12), SkFloatToScalar(mat._22), SkFloatToScalar(mat._32),
  83                   0, 0, SK_Scalar1);
  84 }
  85
  86 static inline SkPaint::Cap
  87 CapStyleToSkiaCap(CapStyle aCap)
  88 {
  89   switch (aCap)
  90   {
  91     case CAP_BUTT:
  92       return SkPaint::kButt_Cap;
  93     case CAP_ROUND:
  94       return SkPaint::kRound_Cap;
  95     case CAP_SQUARE:
  96       return SkPaint::kSquare_Cap;
  97   }
  98   return SkPaint::kDefault_Cap;
  99 }
 100
 101 static inline SkPaint::Join
 102 JoinStyleToSkiaJoin(JoinStyle aJoin)
 103 {
 104   switch (aJoin)
 105   {
 106     case JOIN_BEVEL:
 107       return SkPaint::kBevel_Join;
 108     case JOIN_ROUND:
 109       return SkPaint::kRound_Join;
 110     case JOIN_MITER:
 111     case JOIN_MITER_OR_BEVEL:
 112       return SkPaint::kMiter_Join;
 113   }
 114   return SkPaint::kDefault_Join;
 115 }
 116
 117 static inline bool
 118 StrokeOptionsToPaint(SkPaint& aPaint, const StrokeOptions &aOptions)
 119 {
 120   // Skia renders 0 width strokes with a width of 1 (and in black),
 121   // so we should just skip the draw call entirely.
 122   if (!aOptions.mLineWidth) {
 123     return false;
 124   }
 125   aPaint.setStrokeWidth(SkFloatToScalar(aOptions.mLineWidth));
 126   aPaint.setStrokeMiter(SkFloatToScalar(aOptions.mMiterLimit));
 127   aPaint.setStrokeCap(CapStyleToSkiaCap(aOptions.mLineCap));
 128   aPaint.setStrokeJoin(JoinStyleToSkiaJoin(aOptions.mLineJoin));
 129
 130   if (aOptions.mDashLength > 0) {
 131     // Skia only supports dash arrays that are multiples of 2.
 132     uint32_t dashCount;
 133
 134     if (aOptions.mDashLength % 2 == 0) {
 135       dashCount = aOptions.mDashLength;
 136     } else {
 137       dashCount = aOptions.mDashLength * 2;
 138     }
 139
 140     std::vector<SkScalar> pattern;
 141     pattern.resize(dashCount);
 142
 143     for (uint32_t i = 0; i < dashCount; i++) {
 144       pattern[i] = SkFloatToScalar(aOptions.mDashPattern[i % aOptions.mDashLength]);
 145     }
 146
 147     SkDashPathEffect* dash = new SkDashPathEffect(&pattern.front(),
 148                                                   dashCount,
 149                                                   SkFloatToScalar(aOptions.mDashOffset));
 150     SkSafeUnref(aPaint.setPathEffect(dash));
 151   }
 152
 153   aPaint.setStyle(SkPaint::kStroke_Style);
 154   return true;
 155 }
 156
 157 static inline SkXfermode::Mode
 158 GfxOpToSkiaOp(CompositionOp op)
 159 {
 160   switch (op)
 161   {
 162     case OP_OVER:
 163       return SkXfermode::kSrcOver_Mode;
 164     case OP_ADD:
 165       return SkXfermode::kPlus_Mode;
 166     case OP_ATOP:
 167       return SkXfermode::kSrcATop_Mode;
 168     case OP_OUT:
 169       return SkXfermode::kSrcOut_Mode;
 170     case OP_IN:
 171       return SkXfermode::kSrcIn_Mode;
 172     case OP_SOURCE:
 173       return SkXfermode::kSrc_Mode;
 174     case OP_DEST_IN:
 175       return SkXfermode::kDstIn_Mode;
 176     case OP_DEST_OUT:
 177       return SkXfermode::kDstOut_Mode;
 178     case OP_DEST_OVER:
 179       return SkXfermode::kDstOver_Mode;
 180     case OP_DEST_ATOP:
 181       return SkXfermode::kDstATop_Mode;
 182     case OP_XOR:
 183       return SkXfermode::kXor_Mode;
 184     case OP_MULTIPLY:
 185       return SkXfermode::kMultiply_Mode;
 186     case OP_SCREEN:
 187       return SkXfermode::kScreen_Mode;
 188     case OP_OVERLAY:
 189       return SkXfermode::kOverlay_Mode;
 190     case OP_DARKEN:
 191       return SkXfermode::kDarken_Mode;
 192     case OP_LIGHTEN:
 193       return SkXfermode::kLighten_Mode;
 194     case OP_COLOR_DODGE:
 195       return SkXfermode::kColorDodge_Mode;
 196     case OP_COLOR_BURN:
 197       return SkXfermode::kColorBurn_Mode;
 198     case OP_HARD_LIGHT:
 199       return SkXfermode::kHardLight_Mode;
 200     case OP_SOFT_LIGHT:
 201       return SkXfermode::kSoftLight_Mode;
 202     case OP_DIFFERENCE:
 203       return SkXfermode::kDifference_Mode;
 204     case OP_EXCLUSION:
 205       return SkXfermode::kExclusion_Mode;
 206     case OP_HUE:
 207       return SkXfermode::kHue_Mode;
 208     case OP_SATURATION:
 209       return SkXfermode::kSaturation_Mode;
 210     case OP_COLOR:
 211       return SkXfermode::kColor_Mode;
 212     case OP_LUMINOSITY:
 213       return SkXfermode::kLuminosity_Mode;
 214     default:
 215       return SkXfermode::kSrcOver_Mode;
 216   }
 217 }
 218
 219 static inline SkColor ColorToSkColor(const Color &color, Float aAlpha)
 220 {
 221   //XXX: do a better job converting to int
 222   return SkColorSetARGB(U8CPU(color.a*aAlpha*255.0), U8CPU(color.r*255.0),
 223                         U8CPU(color.g*255.0), U8CPU(color.b*255.0));
 224 }
 225
 226 static inline SkRect
 227 RectToSkRect(const Rect& aRect)
 228 {
 229   return SkRect::MakeXYWH(SkFloatToScalar(aRect.x), SkFloatToScalar(aRect.y),
 230                           SkFloatToScalar(aRect.width), SkFloatToScalar(aRect.height));
 231 }
 232
 233 static inline SkRect
 234 IntRectToSkRect(const IntRect& aRect)
 235 {
 236   return SkRect::MakeXYWH(SkIntToScalar(aRect.x), SkIntToScalar(aRect.y),
 237                           SkIntToScalar(aRect.width), SkIntToScalar(aRect.height));
 238 }
 239
 240 static inline SkIRect
 241 RectToSkIRect(const Rect& aRect)
 242 {
 243   return SkIRect::MakeXYWH(int32_t(aRect.x), int32_t(aRect.y),
 244                            int32_t(aRect.width), int32_t(aRect.height));
 245 }
 246
 247 static inline SkIRect
 248 IntRectToSkIRect(const IntRect& aRect)
 249 {
 250   return SkIRect::MakeXYWH(aRect.x, aRect.y, aRect.width, aRect.height);
 251 }
 252
 253 static inline Point
 254 SkPointToPoint(const SkPoint &aPoint)
 255 {
 256   return Point(SkScalarToFloat(aPoint.x()), SkScalarToFloat(aPoint.y()));
 257 }
 258
 259 static inline SkShader::TileMode
 260 ExtendModeToTileMode(ExtendMode aMode)
 261 {
 262   switch (aMode)
 263   {
 264     case EXTEND_CLAMP:
 265       return SkShader::kClamp_TileMode;
 266     case EXTEND_REPEAT:
 267       return SkShader::kRepeat_TileMode;
 268     case EXTEND_REFLECT:
 269       return SkShader::kMirror_TileMode;
 270   }
 271   return SkShader::kClamp_TileMode;
 272 }
 273
 274 }
 275 }
 276
 277 #endif /* MOZILLA_GFX_HELPERSSKIA_H_ */