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 "GrInvariantOutput.h" 18#include "effects/GrSingleTextureEffect.h" 19#include "gl/GrGLProcessor.h" 20#include "gl/GrGLSL.h" 21#include "gl/GrGLTexture.h" 22#include "gl/builders/GrGLProgramBuilder.h" 23 24class GrMagnifierEffect : public GrSingleTextureEffect { 25 26public: 27 static GrFragmentProcessor* Create(GrTexture* texture, 28 const SkRect& bounds, 29 float xOffset, 30 float yOffset, 31 float xInvZoom, 32 float yInvZoom, 33 float xInvInset, 34 float yInvInset) { 35 return SkNEW_ARGS(GrMagnifierEffect, (texture, 36 bounds, 37 xOffset, 38 yOffset, 39 xInvZoom, 40 yInvZoom, 41 xInvInset, 42 yInvInset)); 43 } 44 45 virtual ~GrMagnifierEffect() {}; 46 47 const char* name() const override { return "Magnifier"; } 48 49 void getGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; 50 51 GrGLFragmentProcessor* createGLInstance() const override; 52 53 const SkRect& bounds() const { return fBounds; } // Bounds of source image. 54 // Offset to apply to zoomed pixels, (srcRect position / texture size). 55 float x_offset() const { return fXOffset; } 56 float y_offset() const { return fYOffset; } 57 58 // Scale to apply to zoomed pixels (srcRect size / bounds size). 59 float x_inv_zoom() const { return fXInvZoom; } 60 float y_inv_zoom() const { return fYInvZoom; } 61 62 // 1/radius over which to transition from unzoomed to zoomed pixels (bounds size / inset). 63 float x_inv_inset() const { return fXInvInset; } 64 float y_inv_inset() const { return fYInvInset; } 65 66private: 67 GrMagnifierEffect(GrTexture* texture, 68 const SkRect& bounds, 69 float xOffset, 70 float yOffset, 71 float xInvZoom, 72 float yInvZoom, 73 float xInvInset, 74 float yInvInset) 75 : GrSingleTextureEffect(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture)) 76 , fBounds(bounds) 77 , fXOffset(xOffset) 78 , fYOffset(yOffset) 79 , fXInvZoom(xInvZoom) 80 , fYInvZoom(yInvZoom) 81 , fXInvInset(xInvInset) 82 , fYInvInset(yInvInset) { 83 this->initClassID<GrMagnifierEffect>(); 84 } 85 86 bool onIsEqual(const GrFragmentProcessor&) const override; 87 88 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; 89 90 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; 91 92 SkRect fBounds; 93 float fXOffset; 94 float fYOffset; 95 float fXInvZoom; 96 float fYInvZoom; 97 float fXInvInset; 98 float fYInvInset; 99 100 typedef GrSingleTextureEffect INHERITED; 101}; 102 103// For brevity 104typedef GrGLProgramDataManager::UniformHandle UniformHandle; 105 106class GrGLMagnifierEffect : public GrGLFragmentProcessor { 107public: 108 GrGLMagnifierEffect(const GrProcessor&); 109 110 virtual void emitCode(GrGLFPBuilder*, 111 const GrFragmentProcessor&, 112 const char* outputColor, 113 const char* inputColor, 114 const TransformedCoordsArray&, 115 const TextureSamplerArray&) override; 116 117 void setData(const GrGLProgramDataManager&, const GrProcessor&) override; 118 119private: 120 UniformHandle fOffsetVar; 121 UniformHandle fInvZoomVar; 122 UniformHandle fInvInsetVar; 123 UniformHandle fBoundsVar; 124 125 typedef GrGLFragmentProcessor INHERITED; 126}; 127 128GrGLMagnifierEffect::GrGLMagnifierEffect(const GrProcessor&) { 129} 130 131void GrGLMagnifierEffect::emitCode(GrGLFPBuilder* builder, 132 const GrFragmentProcessor&, 133 const char* outputColor, 134 const char* inputColor, 135 const TransformedCoordsArray& coords, 136 const TextureSamplerArray& samplers) { 137 fOffsetVar = builder->addUniform( 138 GrGLProgramBuilder::kFragment_Visibility | 139 GrGLProgramBuilder::kVertex_Visibility, 140 kVec2f_GrSLType, kDefault_GrSLPrecision, "Offset"); 141 fInvZoomVar = builder->addUniform( 142 GrGLProgramBuilder::kFragment_Visibility | 143 GrGLProgramBuilder::kVertex_Visibility, 144 kVec2f_GrSLType, kDefault_GrSLPrecision, "InvZoom"); 145 fInvInsetVar = builder->addUniform( 146 GrGLProgramBuilder::kFragment_Visibility | 147 GrGLProgramBuilder::kVertex_Visibility, 148 kVec2f_GrSLType, kDefault_GrSLPrecision, "InvInset"); 149 fBoundsVar = builder->addUniform( 150 GrGLProgramBuilder::kFragment_Visibility | 151 GrGLProgramBuilder::kVertex_Visibility, 152 kVec4f_GrSLType, kDefault_GrSLPrecision, "Bounds"); 153 154 GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder(); 155 SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0); 156 fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); 157 fsBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n", 158 builder->getUniformCStr(fOffsetVar), 159 coords2D.c_str(), 160 builder->getUniformCStr(fInvZoomVar)); 161 const char* bounds = builder->getUniformCStr(fBoundsVar); 162 fsBuilder->codeAppendf("\t\tvec2 delta = (coord - %s.xy) * %s.zw;\n", bounds, bounds); 163 fsBuilder->codeAppendf("\t\tdelta = min(delta, vec2(1.0, 1.0) - delta);\n"); 164 fsBuilder->codeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar)); 165 166 fsBuilder->codeAppend("\t\tfloat weight = 0.0;\n"); 167 fsBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); 168 fsBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); 169 fsBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n"); 170 fsBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n"); 171 fsBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n"); 172 fsBuilder->codeAppend("\t\t} else {\n"); 173 fsBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n"); 174 fsBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n"); 175 fsBuilder->codeAppend("\t\t}\n"); 176 177 fsBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); 178 fsBuilder->codeAppend("\t\tvec4 output_color = "); 179 fsBuilder->appendTextureLookup(samplers[0], "mix_coord"); 180 fsBuilder->codeAppend(";\n"); 181 182 fsBuilder->codeAppendf("\t\t%s = output_color;", outputColor); 183 SkString modulate; 184 GrGLSLMulVarBy4f(&modulate, outputColor, inputColor); 185 fsBuilder->codeAppend(modulate.c_str()); 186} 187 188void GrGLMagnifierEffect::setData(const GrGLProgramDataManager& pdman, 189 const GrProcessor& effect) { 190 const GrMagnifierEffect& zoom = effect.cast<GrMagnifierEffect>(); 191 pdman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset()); 192 pdman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom()); 193 pdman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset()); 194 pdman.set4f(fBoundsVar, zoom.bounds().x(), zoom.bounds().y(), 195 zoom.bounds().width(), zoom.bounds().height()); 196} 197 198///////////////////////////////////////////////////////////////////// 199 200void GrMagnifierEffect::getGLProcessorKey(const GrGLSLCaps& caps, 201 GrProcessorKeyBuilder* b) const { 202 GrGLMagnifierEffect::GenKey(*this, caps, b); 203} 204 205GrGLFragmentProcessor* GrMagnifierEffect::createGLInstance() const { 206 return SkNEW_ARGS(GrGLMagnifierEffect, (*this)); 207} 208 209GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMagnifierEffect); 210 211GrFragmentProcessor* GrMagnifierEffect::TestCreate(SkRandom* random, 212 GrContext* context, 213 const GrDrawTargetCaps&, 214 GrTexture** textures) { 215 GrTexture* texture = textures[0]; 216 const int kMaxWidth = 200; 217 const int kMaxHeight = 200; 218 const int kMaxInset = 20; 219 uint32_t width = random->nextULessThan(kMaxWidth); 220 uint32_t height = random->nextULessThan(kMaxHeight); 221 uint32_t x = random->nextULessThan(kMaxWidth - width); 222 uint32_t y = random->nextULessThan(kMaxHeight - height); 223 uint32_t inset = random->nextULessThan(kMaxInset); 224 225 GrFragmentProcessor* effect = GrMagnifierEffect::Create( 226 texture, 227 SkRect::MakeWH(SkIntToScalar(kMaxWidth), SkIntToScalar(kMaxHeight)), 228 (float) width / texture->width(), 229 (float) height / texture->height(), 230 texture->width() / (float) x, 231 texture->height() / (float) y, 232 (float) inset / texture->width(), 233 (float) inset / texture->height()); 234 SkASSERT(effect); 235 return effect; 236} 237 238/////////////////////////////////////////////////////////////////////////////// 239 240bool GrMagnifierEffect::onIsEqual(const GrFragmentProcessor& sBase) const { 241 const GrMagnifierEffect& s = sBase.cast<GrMagnifierEffect>(); 242 return (this->fBounds == s.fBounds && 243 this->fXOffset == s.fXOffset && 244 this->fYOffset == s.fYOffset && 245 this->fXInvZoom == s.fXInvZoom && 246 this->fYInvZoom == s.fYInvZoom && 247 this->fXInvInset == s.fXInvInset && 248 this->fYInvInset == s.fYInvInset); 249} 250 251void GrMagnifierEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { 252 this->updateInvariantOutputForModulation(inout); 253} 254 255#endif 256 257//////////////////////////////////////////////////////////////////////////////// 258 259SkImageFilter* SkMagnifierImageFilter::Create(const SkRect& srcRect, SkScalar inset, 260 SkImageFilter* input) { 261 262 if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) { 263 return NULL; 264 } 265 // Negative numbers in src rect are not supported 266 if (srcRect.fLeft < 0 || srcRect.fTop < 0) { 267 return NULL; 268 } 269 return SkNEW_ARGS(SkMagnifierImageFilter, (srcRect, inset, input)); 270} 271 272 273SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset, 274 SkImageFilter* input) 275 : INHERITED(1, &input), fSrcRect(srcRect), fInset(inset) { 276 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); 277} 278 279#if SK_SUPPORT_GPU 280bool SkMagnifierImageFilter::asFragmentProcessor(GrFragmentProcessor** fp, GrTexture* texture, 281 const SkMatrix&, const SkIRect&bounds) const { 282 if (fp) { 283 SkScalar yOffset = texture->origin() == kTopLeft_GrSurfaceOrigin ? fSrcRect.y() : 284 texture->height() - fSrcRect.height() * texture->height() / bounds.height() 285 - fSrcRect.y(); 286 int boundsY = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? bounds.y() : 287 (texture->height() - bounds.height()); 288 SkRect effectBounds = SkRect::MakeXYWH( 289 SkIntToScalar(bounds.x()) / texture->width(), 290 SkIntToScalar(boundsY) / texture->height(), 291 SkIntToScalar(texture->width()) / bounds.width(), 292 SkIntToScalar(texture->height()) / bounds.height()); 293 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 294 *fp = GrMagnifierEffect::Create(texture, 295 effectBounds, 296 fSrcRect.x() / texture->width(), 297 yOffset / texture->height(), 298 fSrcRect.width() / bounds.width(), 299 fSrcRect.height() / bounds.height(), 300 bounds.width() * invInset, 301 bounds.height() * invInset); 302 } 303 return true; 304} 305#endif 306 307SkFlattenable* SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) { 308 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); 309 SkRect src; 310 buffer.readRect(&src); 311 return Create(src, buffer.readScalar(), common.getInput(0)); 312} 313 314void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const { 315 this->INHERITED::flatten(buffer); 316 buffer.writeRect(fSrcRect); 317 buffer.writeScalar(fInset); 318} 319 320bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src, 321 const Context&, SkBitmap* dst, 322 SkIPoint* offset) const { 323 if ((src.colorType() != kN32_SkColorType) || 324 (fSrcRect.width() >= src.width()) || 325 (fSrcRect.height() >= src.height())) { 326 return false; 327 } 328 329 SkAutoLockPixels alp(src); 330 SkASSERT(src.getPixels()); 331 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { 332 return false; 333 } 334 335 if (!dst->tryAllocPixels(src.info())) { 336 return false; 337 } 338 339 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; 340 341 SkScalar inv_x_zoom = fSrcRect.width() / src.width(); 342 SkScalar inv_y_zoom = fSrcRect.height() / src.height(); 343 344 SkColor* sptr = src.getAddr32(0, 0); 345 SkColor* dptr = dst->getAddr32(0, 0); 346 int width = src.width(), height = src.height(); 347 for (int y = 0; y < height; ++y) { 348 for (int x = 0; x < width; ++x) { 349 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset; 350 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset; 351 SkScalar weight = 0; 352 353 static const SkScalar kScalar2 = SkScalar(2); 354 355 // To create a smooth curve at the corners, we need to work on 356 // a square twice the size of the inset. 357 if (x_dist < kScalar2 && y_dist < kScalar2) { 358 x_dist = kScalar2 - x_dist; 359 y_dist = kScalar2 - y_dist; 360 361 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + 362 SkScalarSquare(y_dist)); 363 dist = SkMaxScalar(kScalar2 - dist, 0); 364 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1); 365 } else { 366 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist), 367 SkScalarSquare(y_dist)); 368 weight = SkMinScalar(sqDist, SK_Scalar1); 369 } 370 371 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) + 372 (SK_Scalar1 - weight) * x; 373 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) + 374 (SK_Scalar1 - weight) * y; 375 376 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1); 377 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1); 378 379 *dptr = sptr[y_val * width + x_val]; 380 dptr++; 381 } 382 } 383 return true; 384} 385 386#ifndef SK_IGNORE_TO_STRING 387void SkMagnifierImageFilter::toString(SkString* str) const { 388 str->appendf("SkMagnifierImageFilter: ("); 389 str->appendf("src: (%f,%f,%f,%f) ", 390 fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom); 391 str->appendf("inset: %f", fInset); 392 str->append(")"); 393} 394#endif 395