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| 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 class BATShader : public SkShader { |
| 11 public: |
| 12 SK_DECLARE_INST_COUNT(SkThresholdShader); |
| 13 |
| 14 BATShader(const SkBitmap& bitmap, SkRegion region, U8CPU); |
| 15 BATShader(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) { |
| 16 // We should probably do something here. |
| 17 } |
| 18 |
| 19 |
| 20 virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE {}; |
| 21 |
| 22 #if SK_SUPPORT_GPU |
| 23 virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint) c
onst SK_OVERRIDE; |
| 24 #endif |
| 25 |
| 26 SK_DEVELOPER_TO_STRING(); |
| 27 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(BATShader) |
| 28 |
| 29 private: |
| 30 SkBitmap fBitmap; |
| 31 SkRegion fRegion; |
| 32 U8CPU fThreshold; |
| 33 |
| 34 typedef SkShader INHERITED; |
| 35 }; |
| 36 |
| 37 SkShader* SkBitmapAlphaThresholdShader::Create(const SkBitmap& bitmap, |
| 38 const SkRegion& region, |
| 39 U8CPU threshold) { |
| 40 SkASSERT(threshold < 256); |
| 41 return SkNEW_ARGS(BATShader, (bitmap, region, threshold)); |
| 42 } |
| 43 |
| 44 BATShader::BATShader(const SkBitmap& bitmap, SkRegion region, U8CPU threshold) |
| 45 : fBitmap(bitmap) |
| 46 , fRegion(region) |
| 47 , fThreshold(threshold) { |
| 48 }; |
| 49 |
| 50 |
| 51 #ifdef SK_DEVELOPER |
| 52 void BATShader::toString(SkString* str) const { |
| 53 str->append("BATShader: ("); |
| 54 |
| 55 fBitmap.toString(str); |
| 56 |
| 57 this->INHERITED::toString(str); |
| 58 |
| 59 str->append(")"); |
| 60 } |
| 61 #endif |
| 62 |
| 63 #if SK_SUPPORT_GPU |
| 64 #include "GrContext.h" |
| 65 #include "GrEffect.h" |
| 66 #include "gl/GrGLEffect.h" |
| 67 #include "gl/GrGLEffectMatrix.h" |
| 68 #include "GrTBackendEffectFactory.h" |
| 69 #include "GrTextureAccess.h" |
| 70 |
| 71 #include "SkGr.h" |
| 72 |
| 73 /** |
| 74 * Could create specializations for some simple cases: |
| 75 * - The region is empty. |
| 76 * - The region fully contains the bitmap. |
| 77 * - The regions is 1 rect (or maybe a small number of rects). |
| 78 */ |
| 79 class ThresholdEffect : public GrEffect { |
| 80 public: |
| 81 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE { |
| 82 return GrTBackendEffectFactory<ThresholdEffect>::getInstance(); |
| 83 } |
| 84 |
| 85 static GrEffectRef* Create(GrTexture* bmpTexture, const SkMatrix& bmpMatrix, |
| 86 GrTexture* maskTexture, const SkMatrix& maskMatri
x, |
| 87 U8CPU threshold) { |
| 88 SkScalar thresh = SkIntToScalar(threshold) / 255; |
| 89 |
| 90 AutoEffectUnref effect(SkNEW_ARGS(ThresholdEffect, (bmpTexture, bmpMatri
x, |
| 91 maskTexture, maskMat
rix, |
| 92 thresh))); |
| 93 return CreateEffectRef(effect); |
| 94 } |
| 95 |
| 96 virtual void getConstantColorComponents(GrColor* color, |
| 97 uint32_t* validFlags) const SK_OVERR
IDE { |
| 98 if ((kA_GrColorComponentFlag & *validFlags) && 0 == GrColorUnpackA(*colo
r)) { |
| 99 return; |
| 100 } |
| 101 *validFlags = 0; |
| 102 return; |
| 103 } |
| 104 |
| 105 static const char* Name() { return "Bitmap Alpha Threshold"; } |
| 106 |
| 107 class GLEffect : public GrGLEffect { |
| 108 public: |
| 109 GLEffect(const GrBackendEffectFactory& factory, |
| 110 const GrDrawEffect& e) |
| 111 : GrGLEffect(factory) |
| 112 , fBmpMatrix(GrEffect::kLocal_CoordsType) |
| 113 , fMaskMatrix(GrEffect::kLocal_CoordsType) |
| 114 , fPrevThreshold(-SK_Scalar1) { |
| 115 } |
| 116 |
| 117 virtual void emitCode(GrGLShaderBuilder* builder, |
| 118 const GrDrawEffect& drawEffect, |
| 119 EffectKey key, |
| 120 const char* outputColor, |
| 121 const char* inputColor, |
| 122 const TextureSamplerArray& samplers) SK_OVERRIDE
{ |
| 123 SkString bmpCoord; |
| 124 SkString maskCoord; |
| 125 |
| 126 GrSLType bmpCoordType = fBmpMatrix.emitCode(builder, key, &bmpCoord,
NULL, "Bmp"); |
| 127 EffectKey maskMatrixKey = key >> GrGLEffectMatrix::kKeyBits; |
| 128 GrSLType maskCoordType = fMaskMatrix.emitCode(builder, |
| 129 maskMatrixKey, |
| 130 &maskCoord, |
| 131 NULL, |
| 132 "Mask"); |
| 133 |
| 134 // put bitmap color in "color" |
| 135 builder->fsCodeAppend("\t\tvec4 color = "); |
| 136 builder->fsAppendTextureLookup(samplers[0], bmpCoord.c_str(), bmpCoo
rdType); |
| 137 builder->fsCodeAppend(";\n"); |
| 138 |
| 139 // put alpha from mask texture in "mask" |
| 140 builder->fsCodeAppend("\t\tfloat mask = "); |
| 141 builder->fsAppendTextureLookup(samplers[1], maskCoord.c_str(), maskC
oordType); |
| 142 builder->fsCodeAppend(".a;\n"); |
| 143 |
| 144 const char* threshold; |
| 145 |
| 146 fThresholdUniHandle = builder->addUniform(GrGLShaderBuilder::kFragme
nt_Visibility, |
| 147 kFloat_GrSLType, |
| 148 "threshold", |
| 149 &threshold); |
| 150 builder->fsCodeAppendf("\t\tfloat thresh = %s;\n", threshold); |
| 151 |
| 152 builder->fsCodeAppend("\t\tif (mask < 0.5) {\n" |
| 153 "\t\t\tif (color.a > thresh) {\n" |
| 154 "\t\t\t\tfloat scale = thresh / color.a;\n" |
| 155 "\t\t\t\tcolor.rgb *= scale;\n" |
| 156 "\t\t\t\tcolor.a = thresh;\n" |
| 157 "\t\t\t}\n" |
| 158 "\t\t} else if (color.a < thresh) {\n" |
| 159 "\t\t\tfloat scale = thresh / color.a;\n" |
| 160 "\t\t\tcolor.rgb *= scale;\n" |
| 161 "\t\t\tcolor.a = thresh;\n" |
| 162 "\t\t}\n"); |
| 163 |
| 164 builder->fsCodeAppend("color = "); |
| 165 SkString outStr; |
| 166 outStr.appendf("\t\t%s = ", outputColor); |
| 167 GrGLSLModulatef<4>(&outStr, inputColor, "color"); |
| 168 outStr.append(";\n"); |
| 169 builder->fsCodeAppend(outStr.c_str()); |
| 170 } |
| 171 |
| 172 virtual void setData(const GrGLUniformManager& uman, const GrDrawEffect&
e) SK_OVERRIDE { |
| 173 const ThresholdEffect& effect = e.castEffect<ThresholdEffect>(); |
| 174 fBmpMatrix.setData(uman, effect.fBmpMatrix, e, effect.fBmpAccess.get
Texture()); |
| 175 fMaskMatrix.setData(uman, effect.fMaskMatrix, e, effect.fMaskAccess.
getTexture()); |
| 176 if (fPrevThreshold != effect.fThreshold) { |
| 177 uman.set1f(fThresholdUniHandle, effect.fThreshold); |
| 178 } |
| 179 } |
| 180 |
| 181 static inline EffectKey GenKey(const GrDrawEffect& e, const GrGLCaps&) { |
| 182 const ThresholdEffect& effect = e.castEffect<ThresholdEffect>(); |
| 183 |
| 184 EffectKey bmpMKey = GrGLEffectMatrix::GenKey(effect.fBmpMatrix, |
| 185 e, |
| 186 GrEffect::kLocal_Coords
Type, |
| 187 effect.fBmpAccess.getTe
xture()); |
| 188 EffectKey maskMKey = GrGLEffectMatrix::GenKey(effect.fMaskMatrix, |
| 189 e, |
| 190 GrEffect::kLocal_Coord
sType, |
| 191 effect.fMaskAccess.get
Texture()); |
| 192 return bmpMKey | (maskMKey << GrGLEffectMatrix::kKeyBits); |
| 193 } |
| 194 |
| 195 private: |
| 196 GrGLEffectMatrix fBmpMatrix; |
| 197 GrGLEffectMatrix fMaskMatrix; |
| 198 |
| 199 GrGLUniformManager::UniformHandle fThresholdUniHandle; |
| 200 SkScalar fPrevThreshold; |
| 201 }; |
| 202 |
| 203 GR_DECLARE_EFFECT_TEST; |
| 204 |
| 205 private: |
| 206 ThresholdEffect(GrTexture* bmpTexture, const SkMatrix& bmpMatrix, |
| 207 GrTexture* maskTexture, const SkMatrix& maskMatrix, |
| 208 SkScalar threshold) |
| 209 : fBmpAccess(bmpTexture, GrTextureParams()) |
| 210 , fMaskAccess(maskTexture, GrTextureParams()) |
| 211 , fBmpMatrix(bmpMatrix) |
| 212 , fMaskMatrix(maskMatrix) |
| 213 , fThreshold(threshold) { |
| 214 this->addTextureAccess(&fBmpAccess); |
| 215 this->addTextureAccess(&fMaskAccess); |
| 216 } |
| 217 |
| 218 virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE { |
| 219 const ThresholdEffect& e = CastEffect<ThresholdEffect>(other); |
| 220 return e.fBmpAccess.getTexture() == fBmpAccess.getTexture() && |
| 221 e.fMaskAccess.getTexture() == fMaskAccess.getTexture() && |
| 222 e.fBmpMatrix == fBmpMatrix && |
| 223 e.fMaskMatrix == fMaskMatrix && |
| 224 e.fThreshold == fThreshold; |
| 225 } |
| 226 |
| 227 GrTextureAccess fBmpAccess; |
| 228 GrTextureAccess fMaskAccess; |
| 229 |
| 230 SkMatrix fBmpMatrix; |
| 231 SkMatrix fMaskMatrix; |
| 232 |
| 233 SkScalar fThreshold; |
| 234 }; |
| 235 |
| 236 GR_DEFINE_EFFECT_TEST(ThresholdEffect); |
| 237 |
| 238 GrEffectRef* ThresholdEffect::TestCreate(SkMWCRandom* rand, |
| 239 GrContext*, |
| 240 const GrDrawTargetCaps&, |
| 241 GrTexture* textures[]) { |
| 242 GrTexture* bmpTex = textures[GrEffectUnitTest::kSkiaPMTextureIdx]; |
| 243 GrTexture* maskTex = textures[GrEffectUnitTest::kAlphaTextureIdx]; |
| 244 U8CPU thresh = rand->nextU() % 0xff; |
| 245 return ThresholdEffect::Create(bmpTex, SkMatrix::I(), maskTex, SkMatrix::I()
, thresh); |
| 246 } |
| 247 |
| 248 GrEffectRef* BATShader::asNewEffect(GrContext* context, const SkPaint& paint) co
nst { |
| 249 SkMatrix localInverse; |
| 250 if (!this->getLocalMatrix().invert(&localInverse)) { |
| 251 return NULL; |
| 252 } |
| 253 |
| 254 GrTextureDesc maskDesc; |
| 255 if (context->isConfigRenderable(kAlpha_8_GrPixelConfig)) { |
| 256 maskDesc.fConfig = kAlpha_8_GrPixelConfig; |
| 257 } else { |
| 258 maskDesc.fConfig = kRGBA_8888_GrPixelConfig; |
| 259 } |
| 260 maskDesc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagB
it; |
| 261 const SkIRect& bounds = fRegion.getBounds(); |
| 262 // Add one pixel of border to ensure that clamp mode will be all zeros |
| 263 // the outside. |
| 264 maskDesc.fWidth = bounds.width() + 2; |
| 265 maskDesc.fHeight = bounds.height() + 2; |
| 266 GrAutoScratchTexture ast(context, maskDesc, GrContext::kApprox_ScratchTexMat
ch); |
| 267 GrTexture* maskTexture = ast.texture(); |
| 268 if (NULL == maskTexture) { |
| 269 return NULL; |
| 270 } |
| 271 |
| 272 GrPaint grPaint; |
| 273 grPaint.setBlendFunc(kOne_GrBlendCoeff, kZero_GrBlendCoeff); |
| 274 SkRegion::Iterator iter(fRegion); |
| 275 context->setRenderTarget(maskTexture->asRenderTarget()); |
| 276 context->clear(NULL, 0x0); |
| 277 |
| 278 // offset to ensure border is zero on top/left |
| 279 SkMatrix matrix; |
| 280 matrix.setTranslate(SK_Scalar1, SK_Scalar1); |
| 281 context->setMatrix(matrix); |
| 282 |
| 283 while (!iter.done()) { |
| 284 SkRect rect = SkRect::MakeFromIRect(iter.rect()); |
| 285 context->drawRect(grPaint, rect); |
| 286 iter.next(); |
| 287 } |
| 288 |
| 289 GrTexture* bmpTexture = GrLockAndRefCachedBitmapTexture(context, fBitmap, NU
LL); |
| 290 if (NULL == bmpTexture) { |
| 291 return NULL; |
| 292 } |
| 293 |
| 294 SkMatrix bmpMatrix = localInverse; |
| 295 bmpMatrix.postIDiv(bmpTexture->width(), bmpTexture->height()); |
| 296 |
| 297 SkMatrix maskMatrix = localInverse; |
| 298 // compensate for the border |
| 299 maskMatrix.postTranslate(SK_Scalar1, SK_Scalar1); |
| 300 maskMatrix.postIDiv(maskTexture->width(), maskTexture->height()); |
| 301 |
| 302 GrEffectRef* effect = ThresholdEffect::Create(bmpTexture, bmpMatrix, |
| 303 maskTexture, maskMatrix, |
| 304 fThreshold); |
| 305 |
| 306 GrUnlockAndUnrefCachedBitmapTexture(bmpTexture); |
| 307 |
| 308 return effect; |
| 309 } |
| 310 |
| 311 #endif |
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