1 /* 2 * Copyright 2012 The Android Open Source Project 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 "SkBitmap.h" 9 #include "SkMagnifierImageFilter.h" 10 #include "SkColorPriv.h" 11 #include "SkFlattenableBuffers.h" 12 13 //////////////////////////////////////////////////////////////////////////////// 14 #if SK_SUPPORT_GPU 15 #include "effects/GrSingleTextureEffect.h" 16 #include "gl/GrGLEffect.h" 17 #include "gl/GrGLEffectMatrix.h" 18 #include "gl/GrGLSL.h" 19 #include "gl/GrGLTexture.h" 20 #include "GrTBackendEffectFactory.h" 21 22 class GrGLMagnifierEffect; 23 24 class GrMagnifierEffect : public GrSingleTextureEffect { 25 26 public: 27 static GrEffectRef* Create(GrTexture* texture, 28 float xOffset, 29 float yOffset, 30 float xZoom, 31 float yZoom, 32 float xInset, 33 float yInset) { 34 AutoEffectUnref effect(SkNEW_ARGS(GrMagnifierEffect, (texture, 35 xOffset, 36 yOffset, 37 xZoom, 38 yZoom, 39 xInset, 40 yInset))); 41 return CreateEffectRef(effect); 42 } 43 44 virtual ~GrMagnifierEffect() {}; 45 46 static const char* Name() { return "Magnifier"; } 47 48 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 49 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 50 51 float x_offset() const { return fXOffset; } 52 float y_offset() const { return fYOffset; } 53 float x_zoom() const { return fXZoom; } 54 float y_zoom() const { return fYZoom; } 55 float x_inset() const { return fXInset; } 56 float y_inset() const { return fYInset; } 57 58 typedef GrGLMagnifierEffect GLEffect; 59 60 private: 61 GrMagnifierEffect(GrTexture* texture, 62 float xOffset, 63 float yOffset, 64 float xZoom, 65 float yZoom, 66 float xInset, 67 float yInset) 68 : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture)) 69 , fXOffset(xOffset) 70 , fYOffset(yOffset) 71 , fXZoom(xZoom) 72 , fYZoom(yZoom) 73 , fXInset(xInset) 74 , fYInset(yInset) {} 75 76 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 77 78 GR_DECLARE_EFFECT_TEST; 79 80 float fXOffset; 81 float fYOffset; 82 float fXZoom; 83 float fYZoom; 84 float fXInset; 85 float fYInset; 86 87 typedef GrSingleTextureEffect INHERITED; 88 }; 89 90 // For brevity 91 typedef GrGLUniformManager::UniformHandle UniformHandle; 92 93 class GrGLMagnifierEffect : public GrGLEffect { 94 public: 95 GrGLMagnifierEffect(const GrBackendEffectFactory&, const GrDrawEffect&); 96 97 virtual void emitCode(GrGLShaderBuilder*, 98 const GrDrawEffect&, 99 EffectKey, 100 const char* outputColor, 101 const char* inputColor, 102 const TextureSamplerArray&) SK_OVERRIDE; 103 104 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; 105 106 static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&); 107 108 private: 109 UniformHandle fOffsetVar; 110 UniformHandle fZoomVar; 111 UniformHandle fInsetVar; 112 113 GrGLEffectMatrix fEffectMatrix; 114 115 typedef GrGLEffect INHERITED; 116 }; 117 118 GrGLMagnifierEffect::GrGLMagnifierEffect(const GrBackendEffectFactory& factory, 119 const GrDrawEffect& drawEffect) 120 : INHERITED(factory) 121 , fOffsetVar(GrGLUniformManager::kInvalidUniformHandle) 122 , fZoomVar(GrGLUniformManager::kInvalidUniformHandle) 123 , fInsetVar(GrGLUniformManager::kInvalidUniformHandle) 124 , fEffectMatrix(drawEffect.castEffect<GrMagnifierEffect>().coordsType()) { 125 } 126 127 void GrGLMagnifierEffect::emitCode(GrGLShaderBuilder* builder, 128 const GrDrawEffect&, 129 EffectKey key, 130 const char* outputColor, 131 const char* inputColor, 132 const TextureSamplerArray& samplers) { 133 const char* coords; 134 fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords); 135 fOffsetVar = builder->addUniform( 136 GrGLShaderBuilder::kFragment_ShaderType | 137 GrGLShaderBuilder::kVertex_ShaderType, 138 kVec2f_GrSLType, "uOffset"); 139 fZoomVar = builder->addUniform( 140 GrGLShaderBuilder::kFragment_ShaderType | 141 GrGLShaderBuilder::kVertex_ShaderType, 142 kVec2f_GrSLType, "uZoom"); 143 fInsetVar = builder->addUniform( 144 GrGLShaderBuilder::kFragment_ShaderType | 145 GrGLShaderBuilder::kVertex_ShaderType, 146 kVec2f_GrSLType, "uInset"); 147 148 builder->fsCodeAppendf("\t\tvec2 coord = %s;\n", coords); 149 builder->fsCodeAppendf("\t\tvec2 zoom_coord = %s + %s / %s;\n", 150 builder->getUniformCStr(fOffsetVar), 151 coords, 152 builder->getUniformCStr(fZoomVar)); 153 154 builder->fsCodeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n"); 155 156 builder->fsCodeAppendf("\t\tdelta = delta / %s;\n", builder->getUniformCStr(fInsetVar)); 157 158 builder->fsCodeAppend("\t\tfloat weight = 0.0;\n"); 159 builder->fsCodeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); 160 builder->fsCodeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); 161 builder->fsCodeAppend("\t\t\tfloat dist = length(delta);\n"); 162 builder->fsCodeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n"); 163 builder->fsCodeAppend("\t\t\tweight = min(dist * dist, 1.0);\n"); 164 builder->fsCodeAppend("\t\t} else {\n"); 165 builder->fsCodeAppend("\t\t\tvec2 delta_squared = delta * delta;\n"); 166 builder->fsCodeAppend("\t\t\tweight = min(min(delta_squared.s, delta_squared.y), 1.0);\n"); 167 builder->fsCodeAppend("\t\t}\n"); 168 169 builder->fsCodeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); 170 builder->fsCodeAppend("\t\tvec4 output_color = "); 171 builder->appendTextureLookup(GrGLShaderBuilder::kFragment_ShaderType, samplers[0], "mix_coord"); 172 builder->fsCodeAppend(";\n"); 173 174 builder->fsCodeAppendf("\t\t%s = output_color;", outputColor); 175 SkString modulate; 176 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor); 177 builder->fsCodeAppend(modulate.c_str()); 178 } 179 180 void GrGLMagnifierEffect::setData(const GrGLUniformManager& uman, 181 const GrDrawEffect& drawEffect) { 182 const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>(); 183 uman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset()); 184 uman.set2f(fZoomVar, zoom.x_zoom(), zoom.y_zoom()); 185 uman.set2f(fInsetVar, zoom.x_inset(), zoom.y_inset()); 186 fEffectMatrix.setData(uman, zoom.getMatrix(), drawEffect, zoom.texture(0)); 187 } 188 189 GrGLEffect::EffectKey GrGLMagnifierEffect::GenKey(const GrDrawEffect& drawEffect, 190 const GrGLCaps&) { 191 const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>(); 192 return GrGLEffectMatrix::GenKey(zoom.getMatrix(), 193 drawEffect, 194 zoom.coordsType(), 195 zoom.texture(0)); 196 } 197 198 ///////////////////////////////////////////////////////////////////// 199 200 GR_DEFINE_EFFECT_TEST(GrMagnifierEffect); 201 202 GrEffectRef* GrMagnifierEffect::TestCreate(SkMWCRandom* random, 203 GrContext* context, 204 const GrDrawTargetCaps&, 205 GrTexture** textures) { 206 const int kMaxWidth = 200; 207 const int kMaxHeight = 200; 208 const int kMaxInset = 20; 209 uint32_t width = random->nextULessThan(kMaxWidth); 210 uint32_t height = random->nextULessThan(kMaxHeight); 211 uint32_t x = random->nextULessThan(kMaxWidth - width); 212 uint32_t y = random->nextULessThan(kMaxHeight - height); 213 SkScalar inset = SkIntToScalar(random->nextULessThan(kMaxInset)); 214 215 SkAutoTUnref<SkMagnifierImageFilter> filter( 216 new SkMagnifierImageFilter( 217 SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y), 218 SkIntToScalar(width), SkIntToScalar(height)), 219 inset)); 220 GrEffectRef* effect; 221 filter->asNewEffect(&effect, textures[0], SkIPoint::Make(0, 0)); 222 GrAssert(NULL != effect); 223 return effect; 224 } 225 226 /////////////////////////////////////////////////////////////////////////////// 227 228 const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const { 229 return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance(); 230 } 231 232 bool GrMagnifierEffect::onIsEqual(const GrEffect& sBase) const { 233 const GrMagnifierEffect& s = CastEffect<GrMagnifierEffect>(sBase); 234 return (this->texture(0) == s.texture(0) && 235 this->fXOffset == s.fXOffset && 236 this->fYOffset == s.fYOffset && 237 this->fXZoom == s.fXZoom && 238 this->fYZoom == s.fYZoom && 239 this->fXInset == s.fXInset && 240 this->fYInset == s.fYInset); 241 } 242 243 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 244 this->updateConstantColorComponentsForModulation(color, validFlags); 245 } 246 247 #endif 248 249 //////////////////////////////////////////////////////////////////////////////// 250 SkMagnifierImageFilter::SkMagnifierImageFilter(SkFlattenableReadBuffer& buffer) 251 : INHERITED(buffer) { 252 float x = buffer.readScalar(); 253 float y = buffer.readScalar(); 254 float width = buffer.readScalar(); 255 float height = buffer.readScalar(); 256 fSrcRect = SkRect::MakeXYWH(x, y, width, height); 257 fInset = buffer.readScalar(); 258 } 259 260 // FIXME: implement single-input semantics 261 SkMagnifierImageFilter::SkMagnifierImageFilter(SkRect srcRect, SkScalar inset) 262 : INHERITED(0), fSrcRect(srcRect), fInset(inset) { 263 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); 264 } 265 266 #if SK_SUPPORT_GPU 267 bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture, const SkIPoint&) const { 268 if (effect) { 269 *effect = GrMagnifierEffect::Create(texture, 270 fSrcRect.x() / texture->width(), 271 fSrcRect.y() / texture->height(), 272 texture->width() / fSrcRect.width(), 273 texture->height() / fSrcRect.height(), 274 fInset / texture->width(), 275 fInset / texture->height()); 276 } 277 return true; 278 } 279 #endif 280 281 void SkMagnifierImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { 282 this->INHERITED::flatten(buffer); 283 buffer.writeScalar(fSrcRect.x()); 284 buffer.writeScalar(fSrcRect.y()); 285 buffer.writeScalar(fSrcRect.width()); 286 buffer.writeScalar(fSrcRect.height()); 287 buffer.writeScalar(fInset); 288 } 289 290 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src, 291 const SkMatrix&, SkBitmap* dst, 292 SkIPoint* offset) { 293 SkASSERT(src.config() == SkBitmap::kARGB_8888_Config); 294 SkASSERT(fSrcRect.width() < src.width()); 295 SkASSERT(fSrcRect.height() < src.height()); 296 297 if (src.config() != SkBitmap::kARGB_8888_Config) { 298 return false; 299 } 300 301 SkAutoLockPixels alp(src); 302 SkASSERT(src.getPixels()); 303 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { 304 return false; 305 } 306 307 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 308 309 SkScalar inv_x_zoom = fSrcRect.width() / src.width(); 310 SkScalar inv_y_zoom = fSrcRect.height() / src.height(); 311 312 dst->setConfig(src.config(), src.width(), src.height()); 313 dst->allocPixels(); 314 SkColor* sptr = src.getAddr32(0, 0); 315 SkColor* dptr = dst->getAddr32(0, 0); 316 int width = src.width(), height = src.height(); 317 for (int y = 0; y < height; ++y) { 318 for (int x = 0; x < width; ++x) { 319 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset; 320 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset; 321 SkScalar weight = 0; 322 323 static const SkScalar kScalar2 = SkScalar(2); 324 325 // To create a smooth curve at the corners, we need to work on 326 // a square twice the size of the inset. 327 if (x_dist < kScalar2 && y_dist < kScalar2) { 328 x_dist = kScalar2 - x_dist; 329 y_dist = kScalar2 - y_dist; 330 331 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + 332 SkScalarSquare(y_dist)); 333 dist = SkMaxScalar(kScalar2 - dist, 0); 334 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1); 335 } else { 336 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist), 337 SkScalarSquare(y_dist)); 338 weight = SkMinScalar(sqDist, SK_Scalar1); 339 } 340 341 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) + 342 (SK_Scalar1 - weight) * x; 343 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) + 344 (SK_Scalar1 - weight) * y; 345 346 int x_val = SkMin32(SkScalarFloorToInt(x_interp), width - 1); 347 int y_val = SkMin32(SkScalarFloorToInt(y_interp), height - 1); 348 349 *dptr = sptr[y_val * width + x_val]; 350 dptr++; 351 } 352 } 353 return true; 354 } 355
