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 "SkReadBuffer.h" 12 #include "SkWriteBuffer.h" 13 #include "SkValidationUtils.h" 14 15 //////////////////////////////////////////////////////////////////////////////// 16 #if SK_SUPPORT_GPU 17 #include "effects/GrSingleTextureEffect.h" 18 #include "gl/GrGLEffect.h" 19 #include "gl/GrGLSL.h" 20 #include "gl/GrGLTexture.h" 21 #include "GrTBackendEffectFactory.h" 22 23 class GrGLMagnifierEffect; 24 25 class GrMagnifierEffect : public GrSingleTextureEffect { 26 27 public: 28 static GrEffectRef* Create(GrTexture* texture, 29 float xOffset, 30 float yOffset, 31 float xInvZoom, 32 float yInvZoom, 33 float xInvInset, 34 float yInvInset) { 35 AutoEffectUnref effect(SkNEW_ARGS(GrMagnifierEffect, (texture, 36 xOffset, 37 yOffset, 38 xInvZoom, 39 yInvZoom, 40 xInvInset, 41 yInvInset))); 42 return CreateEffectRef(effect); 43 } 44 45 virtual ~GrMagnifierEffect() {}; 46 47 static const char* Name() { return "Magnifier"; } 48 49 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 50 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; 51 52 float x_offset() const { return fXOffset; } 53 float y_offset() const { return fYOffset; } 54 float x_inv_zoom() const { return fXInvZoom; } 55 float y_inv_zoom() const { return fYInvZoom; } 56 float x_inv_inset() const { return fXInvInset; } 57 float y_inv_inset() const { return fYInvInset; } 58 59 typedef GrGLMagnifierEffect GLEffect; 60 61 private: 62 GrMagnifierEffect(GrTexture* texture, 63 float xOffset, 64 float yOffset, 65 float xInvZoom, 66 float yInvZoom, 67 float xInvInset, 68 float yInvInset) 69 : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture)) 70 , fXOffset(xOffset) 71 , fYOffset(yOffset) 72 , fXInvZoom(xInvZoom) 73 , fYInvZoom(yInvZoom) 74 , fXInvInset(xInvInset) 75 , fYInvInset(yInvInset) {} 76 77 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; 78 79 GR_DECLARE_EFFECT_TEST; 80 81 float fXOffset; 82 float fYOffset; 83 float fXInvZoom; 84 float fYInvZoom; 85 float fXInvInset; 86 float fYInvInset; 87 88 typedef GrSingleTextureEffect INHERITED; 89 }; 90 91 // For brevity 92 typedef GrGLUniformManager::UniformHandle UniformHandle; 93 94 class GrGLMagnifierEffect : public GrGLEffect { 95 public: 96 GrGLMagnifierEffect(const GrBackendEffectFactory&, const GrDrawEffect&); 97 98 virtual void emitCode(GrGLShaderBuilder*, 99 const GrDrawEffect&, 100 EffectKey, 101 const char* outputColor, 102 const char* inputColor, 103 const TransformedCoordsArray&, 104 const TextureSamplerArray&) SK_OVERRIDE; 105 106 virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; 107 108 private: 109 UniformHandle fOffsetVar; 110 UniformHandle fInvZoomVar; 111 UniformHandle fInvInsetVar; 112 113 typedef GrGLEffect INHERITED; 114 }; 115 116 GrGLMagnifierEffect::GrGLMagnifierEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) 117 : INHERITED(factory) { 118 } 119 120 void GrGLMagnifierEffect::emitCode(GrGLShaderBuilder* builder, 121 const GrDrawEffect&, 122 EffectKey key, 123 const char* outputColor, 124 const char* inputColor, 125 const TransformedCoordsArray& coords, 126 const TextureSamplerArray& samplers) { 127 SkString coords2D = builder->ensureFSCoords2D(coords, 0); 128 fOffsetVar = builder->addUniform( 129 GrGLShaderBuilder::kFragment_Visibility | 130 GrGLShaderBuilder::kVertex_Visibility, 131 kVec2f_GrSLType, "Offset"); 132 fInvZoomVar = builder->addUniform( 133 GrGLShaderBuilder::kFragment_Visibility | 134 GrGLShaderBuilder::kVertex_Visibility, 135 kVec2f_GrSLType, "InvZoom"); 136 fInvInsetVar = builder->addUniform( 137 GrGLShaderBuilder::kFragment_Visibility | 138 GrGLShaderBuilder::kVertex_Visibility, 139 kVec2f_GrSLType, "InvInset"); 140 141 builder->fsCodeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); 142 builder->fsCodeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n", 143 builder->getUniformCStr(fOffsetVar), 144 coords2D.c_str(), 145 builder->getUniformCStr(fInvZoomVar)); 146 147 builder->fsCodeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n"); 148 149 builder->fsCodeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar)); 150 151 builder->fsCodeAppend("\t\tfloat weight = 0.0;\n"); 152 builder->fsCodeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); 153 builder->fsCodeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); 154 builder->fsCodeAppend("\t\t\tfloat dist = length(delta);\n"); 155 builder->fsCodeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n"); 156 builder->fsCodeAppend("\t\t\tweight = min(dist * dist, 1.0);\n"); 157 builder->fsCodeAppend("\t\t} else {\n"); 158 builder->fsCodeAppend("\t\t\tvec2 delta_squared = delta * delta;\n"); 159 builder->fsCodeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n"); 160 builder->fsCodeAppend("\t\t}\n"); 161 162 builder->fsCodeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); 163 builder->fsCodeAppend("\t\tvec4 output_color = "); 164 builder->fsAppendTextureLookup(samplers[0], "mix_coord"); 165 builder->fsCodeAppend(";\n"); 166 167 builder->fsCodeAppendf("\t\t%s = output_color;", outputColor); 168 SkString modulate; 169 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor); 170 builder->fsCodeAppend(modulate.c_str()); 171 } 172 173 void GrGLMagnifierEffect::setData(const GrGLUniformManager& uman, 174 const GrDrawEffect& drawEffect) { 175 const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>(); 176 uman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset()); 177 uman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom()); 178 uman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset()); 179 } 180 181 ///////////////////////////////////////////////////////////////////// 182 183 GR_DEFINE_EFFECT_TEST(GrMagnifierEffect); 184 185 GrEffectRef* GrMagnifierEffect::TestCreate(SkRandom* random, 186 GrContext* context, 187 const GrDrawTargetCaps&, 188 GrTexture** textures) { 189 GrTexture* texture = textures[0]; 190 const int kMaxWidth = 200; 191 const int kMaxHeight = 200; 192 const int kMaxInset = 20; 193 uint32_t width = random->nextULessThan(kMaxWidth); 194 uint32_t height = random->nextULessThan(kMaxHeight); 195 uint32_t x = random->nextULessThan(kMaxWidth - width); 196 uint32_t y = random->nextULessThan(kMaxHeight - height); 197 uint32_t inset = random->nextULessThan(kMaxInset); 198 199 GrEffectRef* effect = GrMagnifierEffect::Create( 200 texture, 201 (float) width / texture->width(), 202 (float) height / texture->height(), 203 texture->width() / (float) x, 204 texture->height() / (float) y, 205 (float) inset / texture->width(), 206 (float) inset / texture->height()); 207 SkASSERT(NULL != effect); 208 return effect; 209 } 210 211 /////////////////////////////////////////////////////////////////////////////// 212 213 const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const { 214 return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance(); 215 } 216 217 bool GrMagnifierEffect::onIsEqual(const GrEffect& sBase) const { 218 const GrMagnifierEffect& s = CastEffect<GrMagnifierEffect>(sBase); 219 return (this->texture(0) == s.texture(0) && 220 this->fXOffset == s.fXOffset && 221 this->fYOffset == s.fYOffset && 222 this->fXInvZoom == s.fXInvZoom && 223 this->fYInvZoom == s.fYInvZoom && 224 this->fXInvInset == s.fXInvInset && 225 this->fYInvInset == s.fYInvInset); 226 } 227 228 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { 229 this->updateConstantColorComponentsForModulation(color, validFlags); 230 } 231 232 #endif 233 234 //////////////////////////////////////////////////////////////////////////////// 235 SkMagnifierImageFilter::SkMagnifierImageFilter(SkReadBuffer& buffer) 236 : INHERITED(1, buffer) { 237 float x = buffer.readScalar(); 238 float y = buffer.readScalar(); 239 float width = buffer.readScalar(); 240 float height = buffer.readScalar(); 241 fSrcRect = SkRect::MakeXYWH(x, y, width, height); 242 fInset = buffer.readScalar(); 243 244 buffer.validate(SkScalarIsFinite(fInset) && SkIsValidRect(fSrcRect) && 245 // Negative numbers in src rect are not supported 246 (fSrcRect.fLeft >= 0) && (fSrcRect.fTop >= 0)); 247 } 248 249 // FIXME: implement single-input semantics 250 SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset) 251 : INHERITED(0), fSrcRect(srcRect), fInset(inset) { 252 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); 253 } 254 255 #if SK_SUPPORT_GPU 256 bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture, const SkMatrix&, const SkIRect&) const { 257 if (effect) { 258 SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() : 259 (texture->height() - (fSrcRect.y() + fSrcRect.height())); 260 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 261 *effect = GrMagnifierEffect::Create(texture, 262 fSrcRect.x() / texture->width(), 263 yOffset / texture->height(), 264 fSrcRect.width() / texture->width(), 265 fSrcRect.height() / texture->height(), 266 texture->width() * invInset, 267 texture->height() * invInset); 268 } 269 return true; 270 } 271 #endif 272 273 void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const { 274 this->INHERITED::flatten(buffer); 275 buffer.writeScalar(fSrcRect.x()); 276 buffer.writeScalar(fSrcRect.y()); 277 buffer.writeScalar(fSrcRect.width()); 278 buffer.writeScalar(fSrcRect.height()); 279 buffer.writeScalar(fInset); 280 } 281 282 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src, 283 const Context&, SkBitmap* dst, 284 SkIPoint* offset) const { 285 SkASSERT(src.colorType() == kN32_SkColorType); 286 SkASSERT(fSrcRect.width() < src.width()); 287 SkASSERT(fSrcRect.height() < src.height()); 288 289 if ((src.colorType() != kN32_SkColorType) || 290 (fSrcRect.width() >= src.width()) || 291 (fSrcRect.height() >= src.height())) { 292 return false; 293 } 294 295 SkAutoLockPixels alp(src); 296 SkASSERT(src.getPixels()); 297 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { 298 return false; 299 } 300 301 if (!dst->allocPixels(src.info())) { 302 return false; 303 } 304 305 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 306 307 SkScalar inv_x_zoom = fSrcRect.width() / src.width(); 308 SkScalar inv_y_zoom = fSrcRect.height() / src.height(); 309 310 SkColor* sptr = src.getAddr32(0, 0); 311 SkColor* dptr = dst->getAddr32(0, 0); 312 int width = src.width(), height = src.height(); 313 for (int y = 0; y < height; ++y) { 314 for (int x = 0; x < width; ++x) { 315 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset; 316 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset; 317 SkScalar weight = 0; 318 319 static const SkScalar kScalar2 = SkScalar(2); 320 321 // To create a smooth curve at the corners, we need to work on 322 // a square twice the size of the inset. 323 if (x_dist < kScalar2 && y_dist < kScalar2) { 324 x_dist = kScalar2 - x_dist; 325 y_dist = kScalar2 - y_dist; 326 327 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + 328 SkScalarSquare(y_dist)); 329 dist = SkMaxScalar(kScalar2 - dist, 0); 330 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1); 331 } else { 332 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist), 333 SkScalarSquare(y_dist)); 334 weight = SkMinScalar(sqDist, SK_Scalar1); 335 } 336 337 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) + 338 (SK_Scalar1 - weight) * x; 339 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) + 340 (SK_Scalar1 - weight) * y; 341 342 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1); 343 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1); 344 345 *dptr = sptr[y_val * width + x_val]; 346 dptr++; 347 } 348 } 349 return true; 350 } 351
