OLD | NEW |
(Empty) | |
| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkBitmapAlphaThresholdShader.h" |
| 9 |
| 10 SkBitmapAlphaThresholdShader::SkBitmapAlphaThresholdShader(SkBitmap bitmap, |
| 11 SkRegion region, |
| 12 U8CPU threshold) |
| 13 : fBitmap(bitmap) |
| 14 , fRegion(region) |
| 15 , fThreshold(threshold) { |
| 16 } |
| 17 |
| 18 SkShader* SkBitmapAlphaThresholdShader::Create(SkBitmap bitmap, |
| 19 const SkRegion& region, |
| 20 U8CPU threshold) { |
| 21 SkASSERT(threshold < 256); |
| 22 return SkNEW_ARGS(SkBitmapAlphaThresholdShader, (bitmap, region, threshold))
; |
| 23 } |
| 24 |
| 25 #ifdef SK_DEVELOPER |
| 26 void SkBitmapAlphaThresholdShader::toString(SkString* str) const { |
| 27 str->append("ThresholdShader: ("); |
| 28 |
| 29 fBitmap.toString(str); |
| 30 |
| 31 this->INHERITED::toString(str); |
| 32 |
| 33 str->append(")"); |
| 34 } |
| 35 #endif |
| 36 |
| 37 #if SK_SUPPORT_GPU |
| 38 #include "GrContext.h" |
| 39 #include "GrEffect.h" |
| 40 #include "gl/GrGLEffect.h" |
| 41 #include "gl/GrGLEffectMatrix.h" |
| 42 #include "GrTBackendEffectFactory.h" |
| 43 #include "GrTextureAccess.h" |
| 44 |
| 45 #include "SkGr.h" |
| 46 |
| 47 /** |
| 48 * Could create specializations for some simple cases: |
| 49 * - The region is empty. |
| 50 * - The region fully contains the bitmap. |
| 51 * - The regions is 1 rect (or maybe a small number of rects). |
| 52 */ |
| 53 class ThresholdEffect : public GrEffect { |
| 54 public: |
| 55 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE { |
| 56 return GrTBackendEffectFactory<ThresholdEffect>::getInstance(); |
| 57 } |
| 58 |
| 59 static GrEffectRef* Create(GrTexture* bmpTexture, const SkMatrix& bmpMatrix, |
| 60 GrTexture* maskTexture, const SkMatrix& maskMatri
x, |
| 61 U8CPU threshold) { |
| 62 SkScalar thresh = SkIntToScalar(threshold) / 255; |
| 63 |
| 64 AutoEffectUnref effect(SkNEW_ARGS(ThresholdEffect, (bmpTexture, bmpMatri
x, |
| 65 maskTexture, maskMat
rix, |
| 66 thresh))); |
| 67 return CreateEffectRef(effect); |
| 68 } |
| 69 |
| 70 virtual void getConstantColorComponents(GrColor* color, |
| 71 uint32_t* validFlags) const SK_OVERR
IDE { |
| 72 if ((kA_GrColorComponentFlag & *validFlags) && 0 == GrColorUnpackA(*colo
r)) { |
| 73 return; |
| 74 } |
| 75 *validFlags = 0; |
| 76 return; |
| 77 } |
| 78 |
| 79 static const char* Name() { return "Bitmap Alpha Threshold"; } |
| 80 |
| 81 class GLEffect : public GrGLEffect { |
| 82 public: |
| 83 GLEffect(const GrBackendEffectFactory& factory, |
| 84 const GrDrawEffect& e) |
| 85 : GrGLEffect(factory) |
| 86 , fBmpMatrix(GrEffect::kLocal_CoordsType) |
| 87 , fMaskMatrix(GrEffect::kLocal_CoordsType) |
| 88 , fPrevThreshold(-SK_Scalar1) { |
| 89 } |
| 90 |
| 91 virtual void emitCode(GrGLShaderBuilder* builder, |
| 92 const GrDrawEffect& drawEffect, |
| 93 EffectKey key, |
| 94 const char* outputColor, |
| 95 const char* inputColor, |
| 96 const TextureSamplerArray& samplers) SK_OVERRIDE
{ |
| 97 SkString bmpCoord; |
| 98 SkString maskCoord; |
| 99 |
| 100 GrSLType bmpCoordType = fBmpMatrix.emitCode(builder, key, &bmpCoord,
NULL, "Bmp"); |
| 101 EffectKey maskMatrixKey = key >> GrGLEffectMatrix::kKeyBits; |
| 102 GrSLType maskCoordType = fMaskMatrix.emitCode(builder, |
| 103 maskMatrixKey, |
| 104 &maskCoord, |
| 105 NULL, |
| 106 "Mask"); |
| 107 |
| 108 // put bitmap color in "color" |
| 109 builder->fsCodeAppend("\t\tvec4 color = "); |
| 110 builder->fsAppendTextureLookup(samplers[0], bmpCoord.c_str(), bmpCoo
rdType); |
| 111 builder->fsCodeAppend(";\n"); |
| 112 |
| 113 // put alpha from mask texture in "mask" |
| 114 builder->fsCodeAppend("\t\tfloat mask = "); |
| 115 builder->fsAppendTextureLookup(samplers[1], maskCoord.c_str(), maskC
oordType); |
| 116 builder->fsCodeAppend(".a;\n"); |
| 117 |
| 118 const char* threshold; |
| 119 |
| 120 fThresholdUniHandle = builder->addUniform(GrGLShaderBuilder::kFragme
nt_Visibility, |
| 121 kFloat_GrSLType, |
| 122 "threshold", |
| 123 &threshold); |
| 124 builder->fsCodeAppendf("\t\tfloat thresh = %s;\n", threshold); |
| 125 |
| 126 builder->fsCodeAppend("\t\tif (mask < 0.5) {\n" |
| 127 "\t\t\tif (color.a > thresh) {\n" |
| 128 "\t\t\t\tfloat scale = thresh / color.a;\n" |
| 129 "\t\t\t\tcolor.rgb *= scale;\n" |
| 130 "\t\t\t\tcolor.a = thresh;\n" |
| 131 "\t\t\t}\n" |
| 132 "\t\t} else if (color.a < thresh) {\n" |
| 133 "\t\t\tfloat scale = thresh / color.a;\n" |
| 134 "\t\t\tcolor.rgb *= scale;\n" |
| 135 "\t\t\tcolor.a = thresh;\n" |
| 136 "\t\t}\n"); |
| 137 |
| 138 builder->fsCodeAppend("color = "); |
| 139 SkString outStr; |
| 140 outStr.appendf("\t\t%s = ", outputColor); |
| 141 GrGLSLModulatef<4>(&outStr, inputColor, "color"); |
| 142 outStr.append(";\n"); |
| 143 builder->fsCodeAppend(outStr.c_str()); |
| 144 } |
| 145 |
| 146 virtual void setData(const GrGLUniformManager& uman, const GrDrawEffect&
e) SK_OVERRIDE { |
| 147 const ThresholdEffect& effect = e.castEffect<ThresholdEffect>(); |
| 148 fBmpMatrix.setData(uman, effect.fBmpMatrix, e, effect.fBmpAccess.get
Texture()); |
| 149 fMaskMatrix.setData(uman, effect.fMaskMatrix, e, effect.fMaskAccess.
getTexture()); |
| 150 if (fPrevThreshold != effect.fThreshold) { |
| 151 uman.set1f(fThresholdUniHandle, effect.fThreshold); |
| 152 } |
| 153 } |
| 154 |
| 155 static inline EffectKey GenKey(const GrDrawEffect& e, const GrGLCaps&) { |
| 156 const ThresholdEffect& effect = e.castEffect<ThresholdEffect>(); |
| 157 |
| 158 EffectKey bmpMKey = GrGLEffectMatrix::GenKey(effect.fBmpMatrix, |
| 159 e, |
| 160 GrEffect::kLocal_Coords
Type, |
| 161 effect.fBmpAccess.getTe
xture()); |
| 162 EffectKey maskMKey = GrGLEffectMatrix::GenKey(effect.fMaskMatrix, |
| 163 e, |
| 164 GrEffect::kLocal_Coord
sType, |
| 165 effect.fMaskAccess.get
Texture()); |
| 166 return bmpMKey | (maskMKey << GrGLEffectMatrix::kKeyBits); |
| 167 } |
| 168 |
| 169 private: |
| 170 GrGLEffectMatrix fBmpMatrix; |
| 171 GrGLEffectMatrix fMaskMatrix; |
| 172 |
| 173 GrGLUniformManager::UniformHandle fThresholdUniHandle; |
| 174 SkScalar fPrevThreshold; |
| 175 }; |
| 176 |
| 177 GR_DECLARE_EFFECT_TEST; |
| 178 |
| 179 private: |
| 180 ThresholdEffect(GrTexture* bmpTexture, const SkMatrix& bmpMatrix, |
| 181 GrTexture* maskTexture, const SkMatrix& maskMatrix, |
| 182 SkScalar threshold) |
| 183 : fBmpAccess(bmpTexture, GrTextureParams()) |
| 184 , fMaskAccess(maskTexture, GrTextureParams()) |
| 185 , fBmpMatrix(bmpMatrix) |
| 186 , fMaskMatrix(maskMatrix) |
| 187 , fThreshold(threshold) { |
| 188 this->addTextureAccess(&fBmpAccess); |
| 189 this->addTextureAccess(&fMaskAccess); |
| 190 } |
| 191 |
| 192 virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE { |
| 193 const ThresholdEffect& e = CastEffect<ThresholdEffect>(other); |
| 194 return e.fBmpAccess.getTexture() == fBmpAccess.getTexture() && |
| 195 e.fMaskAccess.getTexture() == fMaskAccess.getTexture() && |
| 196 e.fBmpMatrix == fBmpMatrix && |
| 197 e.fMaskMatrix == fMaskMatrix && |
| 198 e.fThreshold == fThreshold; |
| 199 } |
| 200 |
| 201 GrTextureAccess fBmpAccess; |
| 202 GrTextureAccess fMaskAccess; |
| 203 |
| 204 SkMatrix fBmpMatrix; |
| 205 SkMatrix fMaskMatrix; |
| 206 |
| 207 SkScalar fThreshold; |
| 208 }; |
| 209 |
| 210 GR_DEFINE_EFFECT_TEST(ThresholdEffect); |
| 211 |
| 212 GrEffectRef* ThresholdEffect::TestCreate(SkMWCRandom* rand, |
| 213 GrContext*, |
| 214 const GrDrawTargetCaps&, |
| 215 GrTexture* textures[]) { |
| 216 GrTexture* bmpTex = textures[GrEffectUnitTest::kSkiaPMTextureIdx]; |
| 217 GrTexture* maskTex = textures[GrEffectUnitTest::kAlphaTextureIdx]; |
| 218 U8CPU thresh = rand->nextU() % 0xff; |
| 219 return ThresholdEffect::Create(bmpTex, SkMatrix::I(), maskTex, SkMatrix::I()
, thresh); |
| 220 } |
| 221 |
| 222 GrEffectRef* SkBitmapAlphaThresholdShader::asNewEffect(GrContext* context, |
| 223 const SkPaint& paint) con
st { |
| 224 SkMatrix localInverse; |
| 225 if (!this->getLocalMatrix().invert(&localInverse)) { |
| 226 return NULL; |
| 227 } |
| 228 |
| 229 GrTextureDesc maskDesc; |
| 230 if (context->isConfigRenderable(kAlpha_8_GrPixelConfig)) { |
| 231 maskDesc.fConfig = kAlpha_8_GrPixelConfig; |
| 232 } else { |
| 233 maskDesc.fConfig = kRGBA_8888_GrPixelConfig; |
| 234 } |
| 235 maskDesc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagB
it; |
| 236 const SkIRect& bounds = fRegion.getBounds(); |
| 237 // Add one pixel of border to ensure that clamp mode will be all zeros |
| 238 // the outside. |
| 239 maskDesc.fWidth = bounds.width() + 2; |
| 240 maskDesc.fHeight = bounds.height() + 2; |
| 241 GrAutoScratchTexture ast(context, maskDesc, GrContext::kApprox_ScratchTexMat
ch); |
| 242 GrTexture* maskTexture = ast.texture(); |
| 243 if (NULL == maskTexture) { |
| 244 return false; |
| 245 } |
| 246 |
| 247 GrPaint grPaint; |
| 248 grPaint.setBlendFunc(kOne_GrBlendCoeff, kZero_GrBlendCoeff); |
| 249 SkRegion::Iterator iter(fRegion); |
| 250 context->setRenderTarget(maskTexture->asRenderTarget()); |
| 251 context->clear(NULL, 0x0); |
| 252 |
| 253 // offset to ensure border is zero on top/left |
| 254 SkMatrix matrix; |
| 255 matrix.setTranslate(SK_Scalar1, SK_Scalar1); |
| 256 context->setMatrix(matrix); |
| 257 |
| 258 while (!iter.done()) { |
| 259 SkRect rect = SkRect::MakeFromIRect(iter.rect()); |
| 260 context->drawRect(grPaint, rect); |
| 261 iter.next(); |
| 262 } |
| 263 |
| 264 GrTexture* bmpTexture = GrLockAndRefCachedBitmapTexture(context, fBitmap, NU
LL); |
| 265 if (NULL == bmpTexture) { |
| 266 return NULL; |
| 267 } |
| 268 |
| 269 SkMatrix bmpMatrix = localInverse; |
| 270 bmpMatrix.postIDiv(bmpTexture->width(), bmpTexture->height()); |
| 271 |
| 272 SkMatrix maskMatrix = localInverse; |
| 273 // compensate for the border |
| 274 maskMatrix.postTranslate(SK_Scalar1, SK_Scalar1); |
| 275 maskMatrix.postIDiv(maskTexture->width(), maskTexture->height()); |
| 276 |
| 277 GrEffectRef* effect = ThresholdEffect::Create(bmpTexture, bmpMatrix, |
| 278 maskTexture, maskMatrix, |
| 279 fThreshold); |
| 280 |
| 281 GrUnlockAndUnrefCachedBitmapTexture(bmpTexture); |
| 282 |
| 283 return effect; |
| 284 } |
| 285 |
| 286 #endif |
OLD | NEW |