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.
8 #include "SkMagnifierImageFilter.h"
11 #include "SkColorPriv.h"
12 #include "SkReadBuffer.h"
13 #include "SkSpecialImage.h"
14 #include "SkWriteBuffer.h"
15 #include "SkValidationUtils.h"
17 ////////////////////////////////////////////////////////////////////////////////
19 #include "GrContext.h"
20 #include "GrDrawContext.h"
21 #include "GrInvariantOutput.h"
22 #include "effects/GrSingleTextureEffect.h"
23 #include "glsl/GrGLSLFragmentProcessor.h"
24 #include "glsl/GrGLSLFragmentShaderBuilder.h"
25 #include "glsl/GrGLSLProgramDataManager.h"
26 #include "glsl/GrGLSLUniformHandler.h"
28 class GrMagnifierEffect : public GrSingleTextureEffect {
31 static GrFragmentProcessor* Create(GrTexture* texture,
39 return new GrMagnifierEffect(texture, bounds,
42 xInvInset, yInvInset);
45 ~GrMagnifierEffect() override {};
47 const char* name() const override { return "Magnifier"; }
49 const SkRect& bounds() const { return fBounds; } // Bounds of source image.
50 // Offset to apply to zoomed pixels, (srcRect position / texture size).
51 float xOffset() const { return fXOffset; }
52 float yOffset() const { return fYOffset; }
54 // Scale to apply to zoomed pixels (srcRect size / bounds size).
55 float xInvZoom() const { return fXInvZoom; }
56 float yInvZoom() const { return fYInvZoom; }
58 // 1/radius over which to transition from unzoomed to zoomed pixels (bounds size / inset).
59 float xInvInset() const { return fXInvInset; }
60 float yInvInset() const { return fYInvInset; }
63 GrMagnifierEffect(GrTexture* texture,
71 : INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
77 , fXInvInset(xInvInset)
78 , fYInvInset(yInvInset) {
79 this->initClassID<GrMagnifierEffect>();
82 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
84 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
86 bool onIsEqual(const GrFragmentProcessor&) const override;
88 void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
90 GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
100 typedef GrSingleTextureEffect INHERITED;
104 typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;
106 class GrGLMagnifierEffect : public GrGLSLFragmentProcessor {
108 void emitCode(EmitArgs&) override;
111 void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override;
114 UniformHandle fOffsetVar;
115 UniformHandle fInvZoomVar;
116 UniformHandle fInvInsetVar;
117 UniformHandle fBoundsVar;
119 typedef GrGLSLFragmentProcessor INHERITED;
122 void GrGLMagnifierEffect::emitCode(EmitArgs& args) {
123 GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
124 fOffsetVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
125 kVec2f_GrSLType, kDefault_GrSLPrecision,
127 fInvZoomVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
128 kVec2f_GrSLType, kDefault_GrSLPrecision,
130 fInvInsetVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
131 kVec2f_GrSLType, kDefault_GrSLPrecision,
133 fBoundsVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
134 kVec4f_GrSLType, kDefault_GrSLPrecision,
137 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
138 SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
139 fragBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
140 fragBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n",
141 uniformHandler->getUniformCStr(fOffsetVar),
143 uniformHandler->getUniformCStr(fInvZoomVar));
144 const char* bounds = uniformHandler->getUniformCStr(fBoundsVar);
145 fragBuilder->codeAppendf("\t\tvec2 delta = (coord - %s.xy) * %s.zw;\n", bounds, bounds);
146 fragBuilder->codeAppendf("\t\tdelta = min(delta, vec2(1.0, 1.0) - delta);\n");
147 fragBuilder->codeAppendf("\t\tdelta = delta * %s;\n",
148 uniformHandler->getUniformCStr(fInvInsetVar));
150 fragBuilder->codeAppend("\t\tfloat weight = 0.0;\n");
151 fragBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n");
152 fragBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n");
153 fragBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n");
154 fragBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
155 fragBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
156 fragBuilder->codeAppend("\t\t} else {\n");
157 fragBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
158 fragBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
159 fragBuilder->codeAppend("\t\t}\n");
161 fragBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
162 fragBuilder->codeAppend("\t\tvec4 output_color = ");
163 fragBuilder->appendTextureLookup(args.fTexSamplers[0], "mix_coord");
164 fragBuilder->codeAppend(";\n");
166 fragBuilder->codeAppendf("\t\t%s = output_color;", args.fOutputColor);
168 GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
169 fragBuilder->codeAppend(modulate.c_str());
172 void GrGLMagnifierEffect::onSetData(const GrGLSLProgramDataManager& pdman,
173 const GrProcessor& effect) {
174 const GrMagnifierEffect& zoom = effect.cast<GrMagnifierEffect>();
175 pdman.set2f(fOffsetVar, zoom.xOffset(), zoom.yOffset());
176 pdman.set2f(fInvZoomVar, zoom.xInvZoom(), zoom.yInvZoom());
177 pdman.set2f(fInvInsetVar, zoom.xInvInset(), zoom.yInvInset());
178 pdman.set4f(fBoundsVar, zoom.bounds().x(), zoom.bounds().y(),
179 zoom.bounds().width(), zoom.bounds().height());
182 /////////////////////////////////////////////////////////////////////
184 void GrMagnifierEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
185 GrProcessorKeyBuilder* b) const {
186 GrGLMagnifierEffect::GenKey(*this, caps, b);
189 GrGLSLFragmentProcessor* GrMagnifierEffect::onCreateGLSLInstance() const {
190 return new GrGLMagnifierEffect;
193 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMagnifierEffect);
195 const GrFragmentProcessor* GrMagnifierEffect::TestCreate(GrProcessorTestData* d) {
196 GrTexture* texture = d->fTextures[0];
197 const int kMaxWidth = 200;
198 const int kMaxHeight = 200;
199 const int kMaxInset = 20;
200 uint32_t width = d->fRandom->nextULessThan(kMaxWidth);
201 uint32_t height = d->fRandom->nextULessThan(kMaxHeight);
202 uint32_t x = d->fRandom->nextULessThan(kMaxWidth - width);
203 uint32_t y = d->fRandom->nextULessThan(kMaxHeight - height);
204 uint32_t inset = d->fRandom->nextULessThan(kMaxInset);
206 GrFragmentProcessor* effect = GrMagnifierEffect::Create(
208 SkRect::MakeWH(SkIntToScalar(kMaxWidth), SkIntToScalar(kMaxHeight)),
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->fBounds == s.fBounds &&
224 this->fXOffset == s.fXOffset &&
225 this->fYOffset == s.fYOffset &&
226 this->fXInvZoom == s.fXInvZoom &&
227 this->fYInvZoom == s.fYInvZoom &&
228 this->fXInvInset == s.fXInvInset &&
229 this->fYInvInset == s.fYInvInset);
232 void GrMagnifierEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
233 this->updateInvariantOutputForModulation(inout);
238 ////////////////////////////////////////////////////////////////////////////////
240 sk_sp<SkImageFilter> SkMagnifierImageFilter::Make(const SkRect& srcRect, SkScalar inset,
241 sk_sp<SkImageFilter> input,
242 const CropRect* cropRect) {
244 if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) {
247 // Negative numbers in src rect are not supported
248 if (srcRect.fLeft < 0 || srcRect.fTop < 0) {
251 return sk_sp<SkImageFilter>(new SkMagnifierImageFilter(srcRect, inset,
257 SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect,
259 sk_sp<SkImageFilter> input,
260 const CropRect* cropRect)
261 : INHERITED(&input, 1, cropRect)
264 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
267 sk_sp<SkFlattenable> SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
268 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
270 buffer.readRect(&src);
271 return Make(src, buffer.readScalar(), common.getInput(0), &common.cropRect());
274 void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
275 this->INHERITED::flatten(buffer);
276 buffer.writeRect(fSrcRect);
277 buffer.writeScalar(fInset);
280 sk_sp<SkSpecialImage> SkMagnifierImageFilter::onFilterImage(SkSpecialImage* source,
282 SkIPoint* offset) const {
283 SkIPoint inputOffset = SkIPoint::Make(0, 0);
284 sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
289 const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
290 input->width(), input->height());
293 if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
297 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
299 SkScalar invXZoom = fSrcRect.width() / bounds.width();
300 SkScalar invYZoom = fSrcRect.height() / bounds.height();
304 if (source->isTextureBacked()) {
305 GrContext* context = source->getContext();
307 sk_sp<GrTexture> inputTexture(input->asTextureRef(context));
308 SkASSERT(inputTexture);
310 offset->fX = bounds.left();
311 offset->fY = bounds.top();
312 bounds.offset(-inputOffset);
314 SkScalar yOffset = inputTexture->origin() == kTopLeft_GrSurfaceOrigin
316 : inputTexture->height() -
317 fSrcRect.height() * inputTexture->height() / bounds.height() - fSrcRect.y();
318 int boundsY = inputTexture->origin() == kTopLeft_GrSurfaceOrigin
320 : inputTexture->height() - bounds.height();
321 SkRect effectBounds = SkRect::MakeXYWH(
322 SkIntToScalar(bounds.x()) / inputTexture->width(),
323 SkIntToScalar(boundsY) / inputTexture->height(),
324 SkIntToScalar(inputTexture->width()) / bounds.width(),
325 SkIntToScalar(inputTexture->height()) / bounds.height());
326 // SRGBTODO: Handle sRGB here
327 sk_sp<GrFragmentProcessor> fp(GrMagnifierEffect::Create(
330 fSrcRect.x() / inputTexture->width(),
331 yOffset / inputTexture->height(),
334 bounds.width() * invInset,
335 bounds.height() * invInset));
340 return DrawWithFP(context, std::move(fp), bounds);
346 if (!input->getROPixels(&inputBM)) {
350 if ((inputBM.colorType() != kN32_SkColorType) ||
351 (fSrcRect.width() >= inputBM.width()) || (fSrcRect.height() >= inputBM.height())) {
355 SkAutoLockPixels alp(inputBM);
356 SkASSERT(inputBM.getPixels());
357 if (!inputBM.getPixels() || inputBM.width() <= 0 || inputBM.height() <= 0) {
361 const SkImageInfo info = SkImageInfo::MakeN32Premul(bounds.width(), bounds.height());
364 if (!dst.tryAllocPixels(info)) {
368 SkAutoLockPixels dstLock(dst);
370 SkColor* dptr = dst.getAddr32(0, 0);
371 int dstWidth = dst.width(), dstHeight = dst.height();
372 for (int y = 0; y < dstHeight; ++y) {
373 for (int x = 0; x < dstWidth; ++x) {
374 SkScalar x_dist = SkMin32(x, dstWidth - x - 1) * invInset;
375 SkScalar y_dist = SkMin32(y, dstHeight - y - 1) * invInset;
378 static const SkScalar kScalar2 = SkScalar(2);
380 // To create a smooth curve at the corners, we need to work on
381 // a square twice the size of the inset.
382 if (x_dist < kScalar2 && y_dist < kScalar2) {
383 x_dist = kScalar2 - x_dist;
384 y_dist = kScalar2 - y_dist;
386 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
387 SkScalarSquare(y_dist));
388 dist = SkMaxScalar(kScalar2 - dist, 0);
389 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
391 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
392 SkScalarSquare(y_dist));
393 weight = SkMinScalar(sqDist, SK_Scalar1);
396 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * invXZoom)) +
397 (SK_Scalar1 - weight) * x;
398 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * invYZoom)) +
399 (SK_Scalar1 - weight) * y;
401 int x_val = SkTPin(bounds.x() + SkScalarFloorToInt(x_interp), 0, inputBM.width() - 1);
402 int y_val = SkTPin(bounds.y() + SkScalarFloorToInt(y_interp), 0, inputBM.height() - 1);
404 *dptr = *inputBM.getAddr32(x_val, y_val);
409 offset->fX = bounds.left();
410 offset->fY = bounds.top();
411 return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()),
415 #ifndef SK_IGNORE_TO_STRING
416 void SkMagnifierImageFilter::toString(SkString* str) const {
417 str->appendf("SkMagnifierImageFilter: (");
418 str->appendf("src: (%f,%f,%f,%f) ",
419 fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom);
420 str->appendf("inset: %f", fInset);