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 "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"
24 class GrMagnifierEffect : public GrSingleTextureEffect {
27 static GrFragmentProcessor* Create(GrTexture* texture,
34 return SkNEW_ARGS(GrMagnifierEffect, (texture,
43 virtual ~GrMagnifierEffect() {};
45 const char* name() const override { return "Magnifier"; }
47 void getGLProcessorKey(const GrGLCaps&, GrProcessorKeyBuilder*) const override;
49 GrGLFragmentProcessor* createGLInstance() const override;
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; }
59 GrMagnifierEffect(GrTexture* texture,
66 : GrSingleTextureEffect(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
71 , fXInvInset(xInvInset)
72 , fYInvInset(yInvInset) {
73 this->initClassID<GrMagnifierEffect>();
76 bool onIsEqual(const GrFragmentProcessor&) const override;
78 void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
80 GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
89 typedef GrSingleTextureEffect INHERITED;
93 typedef GrGLProgramDataManager::UniformHandle UniformHandle;
95 class GrGLMagnifierEffect : public GrGLFragmentProcessor {
97 GrGLMagnifierEffect(const GrProcessor&);
99 virtual void emitCode(GrGLFPBuilder*,
100 const GrFragmentProcessor&,
101 const char* outputColor,
102 const char* inputColor,
103 const TransformedCoordsArray&,
104 const TextureSamplerArray&) override;
106 void setData(const GrGLProgramDataManager&, const GrProcessor&) override;
109 UniformHandle fOffsetVar;
110 UniformHandle fInvZoomVar;
111 UniformHandle fInvInsetVar;
113 typedef GrGLFragmentProcessor INHERITED;
116 GrGLMagnifierEffect::GrGLMagnifierEffect(const GrProcessor&) {
119 void GrGLMagnifierEffect::emitCode(GrGLFPBuilder* builder,
120 const GrFragmentProcessor&,
121 const char* outputColor,
122 const char* inputColor,
123 const TransformedCoordsArray& coords,
124 const TextureSamplerArray& samplers) {
125 fOffsetVar = builder->addUniform(
126 GrGLProgramBuilder::kFragment_Visibility |
127 GrGLProgramBuilder::kVertex_Visibility,
128 kVec2f_GrSLType, kDefault_GrSLPrecision, "Offset");
129 fInvZoomVar = builder->addUniform(
130 GrGLProgramBuilder::kFragment_Visibility |
131 GrGLProgramBuilder::kVertex_Visibility,
132 kVec2f_GrSLType, kDefault_GrSLPrecision, "InvZoom");
133 fInvInsetVar = builder->addUniform(
134 GrGLProgramBuilder::kFragment_Visibility |
135 GrGLProgramBuilder::kVertex_Visibility,
136 kVec2f_GrSLType, kDefault_GrSLPrecision, "InvInset");
138 GrGLFPFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
139 SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
140 fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
141 fsBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n",
142 builder->getUniformCStr(fOffsetVar),
144 builder->getUniformCStr(fInvZoomVar));
146 fsBuilder->codeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n");
148 fsBuilder->codeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar));
150 fsBuilder->codeAppend("\t\tfloat weight = 0.0;\n");
151 fsBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n");
152 fsBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n");
153 fsBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n");
154 fsBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
155 fsBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
156 fsBuilder->codeAppend("\t\t} else {\n");
157 fsBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
158 fsBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
159 fsBuilder->codeAppend("\t\t}\n");
161 fsBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
162 fsBuilder->codeAppend("\t\tvec4 output_color = ");
163 fsBuilder->appendTextureLookup(samplers[0], "mix_coord");
164 fsBuilder->codeAppend(";\n");
166 fsBuilder->codeAppendf("\t\t%s = output_color;", outputColor);
168 GrGLSLMulVarBy4f(&modulate, outputColor, inputColor);
169 fsBuilder->codeAppend(modulate.c_str());
172 void GrGLMagnifierEffect::setData(const GrGLProgramDataManager& pdman,
173 const GrProcessor& effect) {
174 const GrMagnifierEffect& zoom = effect.cast<GrMagnifierEffect>();
175 pdman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset());
176 pdman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom());
177 pdman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset());
180 /////////////////////////////////////////////////////////////////////
182 void GrMagnifierEffect::getGLProcessorKey(const GrGLCaps& caps,
183 GrProcessorKeyBuilder* b) const {
184 GrGLMagnifierEffect::GenKey(*this, caps, b);
187 GrGLFragmentProcessor* GrMagnifierEffect::createGLInstance() const {
188 return SkNEW_ARGS(GrGLMagnifierEffect, (*this));
191 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMagnifierEffect);
193 GrFragmentProcessor* GrMagnifierEffect::TestCreate(SkRandom* random,
195 const GrDrawTargetCaps&,
196 GrTexture** textures) {
197 GrTexture* texture = textures[0];
198 const int kMaxWidth = 200;
199 const int kMaxHeight = 200;
200 const int kMaxInset = 20;
201 uint32_t width = random->nextULessThan(kMaxWidth);
202 uint32_t height = random->nextULessThan(kMaxHeight);
203 uint32_t x = random->nextULessThan(kMaxWidth - width);
204 uint32_t y = random->nextULessThan(kMaxHeight - height);
205 uint32_t inset = random->nextULessThan(kMaxInset);
207 GrFragmentProcessor* effect = GrMagnifierEffect::Create(
209 (float) width / texture->width(),
210 (float) height / texture->height(),
211 texture->width() / (float) x,
212 texture->height() / (float) y,
213 (float) inset / texture->width(),
214 (float) inset / texture->height());
219 ///////////////////////////////////////////////////////////////////////////////
221 bool GrMagnifierEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
222 const GrMagnifierEffect& s = sBase.cast<GrMagnifierEffect>();
223 return (this->fXOffset == s.fXOffset &&
224 this->fYOffset == s.fYOffset &&
225 this->fXInvZoom == s.fXInvZoom &&
226 this->fYInvZoom == s.fYInvZoom &&
227 this->fXInvInset == s.fXInvInset &&
228 this->fYInvInset == s.fYInvInset);
231 void GrMagnifierEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
232 this->updateInvariantOutputForModulation(inout);
237 ////////////////////////////////////////////////////////////////////////////////
239 SkImageFilter* SkMagnifierImageFilter::Create(const SkRect& srcRect, SkScalar inset,
240 SkImageFilter* input) {
242 if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) {
245 // Negative numbers in src rect are not supported
246 if (srcRect.fLeft < 0 || srcRect.fTop < 0) {
249 return SkNEW_ARGS(SkMagnifierImageFilter, (srcRect, inset, input));
253 SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset,
254 SkImageFilter* input)
255 : INHERITED(1, &input), fSrcRect(srcRect), fInset(inset) {
256 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
260 bool SkMagnifierImageFilter::asFragmentProcessor(GrFragmentProcessor** fp, GrTexture* texture,
261 const SkMatrix&, const SkIRect&) const {
263 SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() :
264 (texture->height() - (fSrcRect.y() + fSrcRect.height()));
265 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
266 *fp = GrMagnifierEffect::Create(texture,
267 fSrcRect.x() / texture->width(),
268 yOffset / texture->height(),
269 fSrcRect.width() / texture->width(),
270 fSrcRect.height() / texture->height(),
271 texture->width() * invInset,
272 texture->height() * invInset);
278 SkFlattenable* SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
279 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
281 buffer.readRect(&src);
282 return Create(src, buffer.readScalar(), common.getInput(0));
285 void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
286 this->INHERITED::flatten(buffer);
287 buffer.writeRect(fSrcRect);
288 buffer.writeScalar(fInset);
291 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src,
292 const Context&, SkBitmap* dst,
293 SkIPoint* offset) const {
294 if ((src.colorType() != kN32_SkColorType) ||
295 (fSrcRect.width() >= src.width()) ||
296 (fSrcRect.height() >= src.height())) {
300 SkAutoLockPixels alp(src);
301 SkASSERT(src.getPixels());
302 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) {
306 if (!dst->tryAllocPixels(src.info())) {
310 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
312 SkScalar inv_x_zoom = fSrcRect.width() / src.width();
313 SkScalar inv_y_zoom = fSrcRect.height() / src.height();
315 SkColor* sptr = src.getAddr32(0, 0);
316 SkColor* dptr = dst->getAddr32(0, 0);
317 int width = src.width(), height = src.height();
318 for (int y = 0; y < height; ++y) {
319 for (int x = 0; x < width; ++x) {
320 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset;
321 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset;
324 static const SkScalar kScalar2 = SkScalar(2);
326 // To create a smooth curve at the corners, we need to work on
327 // a square twice the size of the inset.
328 if (x_dist < kScalar2 && y_dist < kScalar2) {
329 x_dist = kScalar2 - x_dist;
330 y_dist = kScalar2 - y_dist;
332 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
333 SkScalarSquare(y_dist));
334 dist = SkMaxScalar(kScalar2 - dist, 0);
335 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
337 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
338 SkScalarSquare(y_dist));
339 weight = SkMinScalar(sqDist, SK_Scalar1);
342 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) +
343 (SK_Scalar1 - weight) * x;
344 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) +
345 (SK_Scalar1 - weight) * y;
347 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1);
348 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1);
350 *dptr = sptr[y_val * width + x_val];
357 #ifndef SK_IGNORE_TO_STRING
358 void SkMagnifierImageFilter::toString(SkString* str) const {
359 str->appendf("SkMagnifierImageFilter: (");
360 str->appendf("src: (%f,%f,%f,%f) ",
361 fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom);
362 str->appendf("inset: %f", fInset);