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 #include "SkValidationUtils.h" 13 14 //////////////////////////////////////////////////////////////////////////////// 15 #if SK_SUPPORT_GPU 16 #include "effects/GrSingleTextureEffect.h" 17 #include "gl/GrGLEffect.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 xInvZoom, 31 float yInvZoom, 32 float xInvInset, 33 float yInvInset) { 34 AutoEffectUnref effect(SkNEW_ARGS(GrMagnifierEffect, (texture, 35 xOffset, 36 yOffset, 37 xInvZoom, 38 yInvZoom, 39 xInvInset, 40 yInvInset))); 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_inv_zoom() const { return fXInvZoom; } 54 float y_inv_zoom() const { return fYInvZoom; } 55 float x_inv_inset() const { return fXInvInset; } 56 float y_inv_inset() const { return fYInvInset; } 57 58 typedef GrGLMagnifierEffect GLEffect; 59 60 private: 61 GrMagnifierEffect(GrTexture* texture, 62 float xOffset, 63 float yOffset, 64 float xInvZoom, 65 float yInvZoom, 66 float xInvInset, 67 float yInvInset) 68 : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture)) 69 , fXOffset(xOffset) 70 , fYOffset(yOffset) 71 , fXInvZoom(xInvZoom) 72 , fYInvZoom(yInvZoom) 73 , fXInvInset(xInvInset) 74 , fYInvInset(yInvInset) {} 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 fXInvZoom; 83 float fYInvZoom; 84 float fXInvInset; 85 float fYInvInset; 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 TransformedCoordsArray&, 103 const TextureSamplerArray&) SK_OVERRIDE; 104 105 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; 106 107 private: 108 UniformHandle fOffsetVar; 109 UniformHandle fInvZoomVar; 110 UniformHandle fInvInsetVar; 111 112 typedef GrGLEffect INHERITED; 113 }; 114 115 GrGLMagnifierEffect::GrGLMagnifierEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) 116 : INHERITED(factory) { 117 } 118 119 void GrGLMagnifierEffect::emitCode(GrGLShaderBuilder* builder, 120 const GrDrawEffect&, 121 EffectKey key, 122 const char* outputColor, 123 const char* inputColor, 124 const TransformedCoordsArray& coords, 125 const TextureSamplerArray& samplers) { 126 SkString coords2D = builder->ensureFSCoords2D(coords, 0); 127 fOffsetVar = builder->addUniform( 128 GrGLShaderBuilder::kFragment_Visibility | 129 GrGLShaderBuilder::kVertex_Visibility, 130 kVec2f_GrSLType, "Offset"); 131 fInvZoomVar = builder->addUniform( 132 GrGLShaderBuilder::kFragment_Visibility | 133 GrGLShaderBuilder::kVertex_Visibility, 134 kVec2f_GrSLType, "InvZoom"); 135 fInvInsetVar = builder->addUniform( 136 GrGLShaderBuilder::kFragment_Visibility | 137 GrGLShaderBuilder::kVertex_Visibility, 138 kVec2f_GrSLType, "InvInset"); 139 140 builder->fsCodeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); 141 builder->fsCodeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n", 142 builder->getUniformCStr(fOffsetVar), 143 coords2D.c_str(), 144 builder->getUniformCStr(fInvZoomVar)); 145 146 builder->fsCodeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n"); 147 148 builder->fsCodeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar)); 149 150 builder->fsCodeAppend("\t\tfloat weight = 0.0;\n"); 151 builder->fsCodeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); 152 builder->fsCodeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); 153 builder->fsCodeAppend("\t\t\tfloat dist = length(delta);\n"); 154 builder->fsCodeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n"); 155 builder->fsCodeAppend("\t\t\tweight = min(dist * dist, 1.0);\n"); 156 builder->fsCodeAppend("\t\t} else {\n"); 157 builder->fsCodeAppend("\t\t\tvec2 delta_squared = delta * delta;\n"); 158 builder->fsCodeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n"); 159 builder->fsCodeAppend("\t\t}\n"); 160 161 builder->fsCodeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); 162 builder->fsCodeAppend("\t\tvec4 output_color = "); 163 builder->fsAppendTextureLookup(samplers[0], "mix_coord"); 164 builder->fsCodeAppend(";\n"); 165 166 builder->fsCodeAppendf("\t\t%s = output_color;", outputColor); 167 SkString modulate; 168 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor); 169 builder->fsCodeAppend(modulate.c_str()); 170 } 171 172 void GrGLMagnifierEffect::setData(const GrGLUniformManager& uman, 173 const GrDrawEffect& drawEffect) { 174 const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>(); 175 uman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset()); 176 uman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom()); 177 uman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset()); 178 } 179 180 ///////////////////////////////////////////////////////////////////// 181 182 GR_DEFINE_EFFECT_TEST(GrMagnifierEffect); 183 184 GrEffectRef* GrMagnifierEffect::TestCreate(SkRandom* random, 185 GrContext* context, 186 const GrDrawTargetCaps&, 187 GrTexture** textures) { 188 GrTexture* texture = textures[0]; 189 const int kMaxWidth = 200; 190 const int kMaxHeight = 200; 191 const int kMaxInset = 20; 192 uint32_t width = random->nextULessThan(kMaxWidth); 193 uint32_t height = random->nextULessThan(kMaxHeight); 194 uint32_t x = random->nextULessThan(kMaxWidth - width); 195 uint32_t y = random->nextULessThan(kMaxHeight - height); 196 uint32_t inset = random->nextULessThan(kMaxInset); 197 198 GrEffectRef* effect = GrMagnifierEffect::Create( 199 texture, 200 (float) width / texture->width(), 201 (float) height / texture->height(), 202 texture->width() / (float) x, 203 texture->height() / (float) y, 204 (float) inset / texture->width(), 205 (float) inset / texture->height()); 206 SkASSERT(NULL != effect); 207 return effect; 208 } 209 210 /////////////////////////////////////////////////////////////////////////////// 211 212 const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const { 213 return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance(); 214 } 215 216 bool GrMagnifierEffect::onIsEqual(const GrEffect& sBase) const { 217 const GrMagnifierEffect& s = CastEffect<GrMagnifierEffect>(sBase); 218 return (this->texture(0) == s.texture(0) && 219 this->fXOffset == s.fXOffset && 220 this->fYOffset == s.fYOffset && 221 this->fXInvZoom == s.fXInvZoom && 222 this->fYInvZoom == s.fYInvZoom && 223 this->fXInvInset == s.fXInvInset && 224 this->fYInvInset == s.fYInvInset); 225 } 226 227 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 228 this->updateConstantColorComponentsForModulation(color, validFlags); 229 } 230 231 #endif 232 233 //////////////////////////////////////////////////////////////////////////////// 234 SkMagnifierImageFilter::SkMagnifierImageFilter(SkFlattenableReadBuffer& buffer) 235 : INHERITED(1, buffer) { 236 float x = buffer.readScalar(); 237 float y = buffer.readScalar(); 238 float width = buffer.readScalar(); 239 float height = buffer.readScalar(); 240 fSrcRect = SkRect::MakeXYWH(x, y, width, height); 241 fInset = buffer.readScalar(); 242 243 buffer.validate(SkScalarIsFinite(fInset) && SkIsValidRect(fSrcRect) && 244 // Negative numbers in src rect are not supported 245 (fSrcRect.fLeft >= 0) && (fSrcRect.fTop >= 0)); 246 } 247 248 // FIXME: implement single-input semantics 249 SkMagnifierImageFilter::SkMagnifierImageFilter(SkRect srcRect, SkScalar inset) 250 : INHERITED(0), fSrcRect(srcRect), fInset(inset) { 251 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); 252 } 253 254 #if SK_SUPPORT_GPU 255 bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture, const SkMatrix&, const SkIRect&) const { 256 if (effect) { 257 SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() : 258 (texture->height() - (fSrcRect.y() + fSrcRect.height())); 259 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 260 *effect = GrMagnifierEffect::Create(texture, 261 fSrcRect.x() / texture->width(), 262 yOffset / texture->height(), 263 fSrcRect.width() / texture->width(), 264 fSrcRect.height() / texture->height(), 265 texture->width() * invInset, 266 texture->height() * invInset); 267 } 268 return true; 269 } 270 #endif 271 272 void SkMagnifierImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { 273 this->INHERITED::flatten(buffer); 274 buffer.writeScalar(fSrcRect.x()); 275 buffer.writeScalar(fSrcRect.y()); 276 buffer.writeScalar(fSrcRect.width()); 277 buffer.writeScalar(fSrcRect.height()); 278 buffer.writeScalar(fInset); 279 } 280 281 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src, 282 const SkMatrix&, SkBitmap* dst, 283 SkIPoint* offset) { 284 SkASSERT(src.config() == SkBitmap::kARGB_8888_Config); 285 SkASSERT(fSrcRect.width() < src.width()); 286 SkASSERT(fSrcRect.height() < src.height()); 287 288 if ((src.config() != SkBitmap::kARGB_8888_Config) || 289 (fSrcRect.width() >= src.width()) || 290 (fSrcRect.height() >= src.height())) { 291 return false; 292 } 293 294 SkAutoLockPixels alp(src); 295 SkASSERT(src.getPixels()); 296 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { 297 return false; 298 } 299 300 dst->setConfig(src.config(), src.width(), src.height()); 301 dst->allocPixels(); 302 if (!dst->getPixels()) { 303 return false; 304 } 305 306 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 307 308 SkScalar inv_x_zoom = fSrcRect.width() / src.width(); 309 SkScalar inv_y_zoom = fSrcRect.height() / src.height(); 310 311 SkColor* sptr = src.getAddr32(0, 0); 312 SkColor* dptr = dst->getAddr32(0, 0); 313 int width = src.width(), height = src.height(); 314 for (int y = 0; y < height; ++y) { 315 for (int x = 0; x < width; ++x) { 316 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset; 317 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset; 318 SkScalar weight = 0; 319 320 static const SkScalar kScalar2 = SkScalar(2); 321 322 // To create a smooth curve at the corners, we need to work on 323 // a square twice the size of the inset. 324 if (x_dist < kScalar2 && y_dist < kScalar2) { 325 x_dist = kScalar2 - x_dist; 326 y_dist = kScalar2 - y_dist; 327 328 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + 329 SkScalarSquare(y_dist)); 330 dist = SkMaxScalar(kScalar2 - dist, 0); 331 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1); 332 } else { 333 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist), 334 SkScalarSquare(y_dist)); 335 weight = SkMinScalar(sqDist, SK_Scalar1); 336 } 337 338 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) + 339 (SK_Scalar1 - weight) * x; 340 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) + 341 (SK_Scalar1 - weight) * y; 342 343 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1); 344 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1); 345 346 *dptr = sptr[y_val * width + x_val]; 347 dptr++; 348 } 349 } 350 return true; 351 } 352
