2 * Copyright 2012 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
9 #include "SkMagnifierImageFilter.h"
10 #include "SkColorPriv.h"
11 #include "SkReadBuffer.h"
12 #include "SkWriteBuffer.h"
13 #include "SkValidationUtils.h"
15 ////////////////////////////////////////////////////////////////////////////////
17 #include "effects/GrSingleTextureEffect.h"
18 #include "gl/GrGLProcessor.h"
19 #include "gl/builders/GrGLProgramBuilder.h"
20 #include "gl/GrGLSL.h"
21 #include "gl/GrGLTexture.h"
22 #include "GrTBackendProcessorFactory.h"
24 class GrGLMagnifierEffect;
26 class GrMagnifierEffect : public GrSingleTextureEffect {
29 static GrFragmentProcessor* Create(GrTexture* texture,
36 return SkNEW_ARGS(GrMagnifierEffect, (texture,
45 virtual ~GrMagnifierEffect() {};
47 static const char* Name() { return "Magnifier"; }
49 virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE;
50 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
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; }
59 typedef GrGLMagnifierEffect GLProcessor;
62 GrMagnifierEffect(GrTexture* texture,
69 : GrSingleTextureEffect(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
74 , fXInvInset(xInvInset)
75 , fYInvInset(yInvInset) {}
77 virtual bool onIsEqual(const GrProcessor&) const SK_OVERRIDE;
79 GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
88 typedef GrSingleTextureEffect INHERITED;
92 typedef GrGLProgramDataManager::UniformHandle UniformHandle;
94 class GrGLMagnifierEffect : public GrGLFragmentProcessor {
96 GrGLMagnifierEffect(const GrBackendProcessorFactory&, const GrProcessor&);
98 virtual void emitCode(GrGLProgramBuilder*,
99 const GrFragmentProcessor&,
100 const GrProcessorKey&,
101 const char* outputColor,
102 const char* inputColor,
103 const TransformedCoordsArray&,
104 const TextureSamplerArray&) SK_OVERRIDE;
106 virtual void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE;
109 UniformHandle fOffsetVar;
110 UniformHandle fInvZoomVar;
111 UniformHandle fInvInsetVar;
113 typedef GrGLFragmentProcessor INHERITED;
116 GrGLMagnifierEffect::GrGLMagnifierEffect(const GrBackendProcessorFactory& factory,
118 : INHERITED(factory) {
121 void GrGLMagnifierEffect::emitCode(GrGLProgramBuilder* builder,
122 const GrFragmentProcessor&,
123 const GrProcessorKey& key,
124 const char* outputColor,
125 const char* inputColor,
126 const TransformedCoordsArray& coords,
127 const TextureSamplerArray& samplers) {
128 fOffsetVar = builder->addUniform(
129 GrGLProgramBuilder::kFragment_Visibility |
130 GrGLProgramBuilder::kVertex_Visibility,
131 kVec2f_GrSLType, "Offset");
132 fInvZoomVar = builder->addUniform(
133 GrGLProgramBuilder::kFragment_Visibility |
134 GrGLProgramBuilder::kVertex_Visibility,
135 kVec2f_GrSLType, "InvZoom");
136 fInvInsetVar = builder->addUniform(
137 GrGLProgramBuilder::kFragment_Visibility |
138 GrGLProgramBuilder::kVertex_Visibility,
139 kVec2f_GrSLType, "InvInset");
141 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder();
142 SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
143 fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
144 fsBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n",
145 builder->getUniformCStr(fOffsetVar),
147 builder->getUniformCStr(fInvZoomVar));
149 fsBuilder->codeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n");
151 fsBuilder->codeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar));
153 fsBuilder->codeAppend("\t\tfloat weight = 0.0;\n");
154 fsBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n");
155 fsBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n");
156 fsBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n");
157 fsBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
158 fsBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
159 fsBuilder->codeAppend("\t\t} else {\n");
160 fsBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
161 fsBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
162 fsBuilder->codeAppend("\t\t}\n");
164 fsBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
165 fsBuilder->codeAppend("\t\tvec4 output_color = ");
166 fsBuilder->appendTextureLookup(samplers[0], "mix_coord");
167 fsBuilder->codeAppend(";\n");
169 fsBuilder->codeAppendf("\t\t%s = output_color;", outputColor);
171 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
172 fsBuilder->codeAppend(modulate.c_str());
175 void GrGLMagnifierEffect::setData(const GrGLProgramDataManager& pdman,
176 const GrProcessor& effect) {
177 const GrMagnifierEffect& zoom = effect.cast<GrMagnifierEffect>();
178 pdman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset());
179 pdman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom());
180 pdman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset());
183 /////////////////////////////////////////////////////////////////////
185 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMagnifierEffect);
187 GrFragmentProcessor* GrMagnifierEffect::TestCreate(SkRandom* random,
189 const GrDrawTargetCaps&,
190 GrTexture** textures) {
191 GrTexture* texture = textures[0];
192 const int kMaxWidth = 200;
193 const int kMaxHeight = 200;
194 const int kMaxInset = 20;
195 uint32_t width = random->nextULessThan(kMaxWidth);
196 uint32_t height = random->nextULessThan(kMaxHeight);
197 uint32_t x = random->nextULessThan(kMaxWidth - width);
198 uint32_t y = random->nextULessThan(kMaxHeight - height);
199 uint32_t inset = random->nextULessThan(kMaxInset);
201 GrFragmentProcessor* effect = GrMagnifierEffect::Create(
203 (float) width / texture->width(),
204 (float) height / texture->height(),
205 texture->width() / (float) x,
206 texture->height() / (float) y,
207 (float) inset / texture->width(),
208 (float) inset / texture->height());
213 ///////////////////////////////////////////////////////////////////////////////
215 const GrBackendFragmentProcessorFactory& GrMagnifierEffect::getFactory() const {
216 return GrTBackendFragmentProcessorFactory<GrMagnifierEffect>::getInstance();
219 bool GrMagnifierEffect::onIsEqual(const GrProcessor& sBase) const {
220 const GrMagnifierEffect& s = sBase.cast<GrMagnifierEffect>();
221 return (this->texture(0) == s.texture(0) &&
222 this->fXOffset == s.fXOffset &&
223 this->fYOffset == s.fYOffset &&
224 this->fXInvZoom == s.fXInvZoom &&
225 this->fYInvZoom == s.fYInvZoom &&
226 this->fXInvInset == s.fXInvInset &&
227 this->fYInvInset == s.fYInvInset);
230 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
231 this->updateConstantColorComponentsForModulation(color, validFlags);
236 ////////////////////////////////////////////////////////////////////////////////
238 SkImageFilter* SkMagnifierImageFilter::Create(const SkRect& srcRect, SkScalar inset,
239 SkImageFilter* input) {
241 if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) {
244 // Negative numbers in src rect are not supported
245 if (srcRect.fLeft < 0 || srcRect.fTop < 0) {
248 return SkNEW_ARGS(SkMagnifierImageFilter, (srcRect, inset, input));
252 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
253 SkMagnifierImageFilter::SkMagnifierImageFilter(SkReadBuffer& buffer)
254 : INHERITED(1, buffer) {
255 float x = buffer.readScalar();
256 float y = buffer.readScalar();
257 float width = buffer.readScalar();
258 float height = buffer.readScalar();
259 fSrcRect = SkRect::MakeXYWH(x, y, width, height);
260 fInset = buffer.readScalar();
262 buffer.validate(SkScalarIsFinite(fInset) && SkIsValidRect(fSrcRect) &&
263 // Negative numbers in src rect are not supported
264 (fSrcRect.fLeft >= 0) && (fSrcRect.fTop >= 0));
268 SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset,
269 SkImageFilter* input)
270 : INHERITED(1, &input), fSrcRect(srcRect), fInset(inset) {
271 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
275 bool SkMagnifierImageFilter::asFragmentProcessor(GrFragmentProcessor** fp, GrTexture* texture,
276 const SkMatrix&, const SkIRect&) const {
278 SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() :
279 (texture->height() - (fSrcRect.y() + fSrcRect.height()));
280 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
281 *fp = GrMagnifierEffect::Create(texture,
282 fSrcRect.x() / texture->width(),
283 yOffset / texture->height(),
284 fSrcRect.width() / texture->width(),
285 fSrcRect.height() / texture->height(),
286 texture->width() * invInset,
287 texture->height() * invInset);
293 SkFlattenable* SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
294 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
296 buffer.readRect(&src);
297 return Create(src, buffer.readScalar(), common.getInput(0));
300 void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
301 this->INHERITED::flatten(buffer);
302 buffer.writeRect(fSrcRect);
303 buffer.writeScalar(fInset);
306 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src,
307 const Context&, SkBitmap* dst,
308 SkIPoint* offset) const {
309 SkASSERT(src.colorType() == kN32_SkColorType);
310 SkASSERT(fSrcRect.width() < src.width());
311 SkASSERT(fSrcRect.height() < src.height());
313 if ((src.colorType() != kN32_SkColorType) ||
314 (fSrcRect.width() >= src.width()) ||
315 (fSrcRect.height() >= src.height())) {
319 SkAutoLockPixels alp(src);
320 SkASSERT(src.getPixels());
321 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) {
325 if (!dst->tryAllocPixels(src.info())) {
329 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
331 SkScalar inv_x_zoom = fSrcRect.width() / src.width();
332 SkScalar inv_y_zoom = fSrcRect.height() / src.height();
334 SkColor* sptr = src.getAddr32(0, 0);
335 SkColor* dptr = dst->getAddr32(0, 0);
336 int width = src.width(), height = src.height();
337 for (int y = 0; y < height; ++y) {
338 for (int x = 0; x < width; ++x) {
339 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset;
340 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset;
343 static const SkScalar kScalar2 = SkScalar(2);
345 // To create a smooth curve at the corners, we need to work on
346 // a square twice the size of the inset.
347 if (x_dist < kScalar2 && y_dist < kScalar2) {
348 x_dist = kScalar2 - x_dist;
349 y_dist = kScalar2 - y_dist;
351 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
352 SkScalarSquare(y_dist));
353 dist = SkMaxScalar(kScalar2 - dist, 0);
354 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
356 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
357 SkScalarSquare(y_dist));
358 weight = SkMinScalar(sqDist, SK_Scalar1);
361 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) +
362 (SK_Scalar1 - weight) * x;
363 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) +
364 (SK_Scalar1 - weight) * y;
366 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1);
367 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1);
369 *dptr = sptr[y_val * width + x_val];