1 | /* |
2 | * Copyright 2013 Google Inc. |
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 "include/effects/SkDisplacementMapEffect.h" |
9 | |
10 | #include "include/core/SkBitmap.h" |
11 | #include "include/core/SkUnPreMultiply.h" |
12 | #include "include/private/SkColorData.h" |
13 | #include "src/core/SkImageFilter_Base.h" |
14 | #include "src/core/SkReadBuffer.h" |
15 | #include "src/core/SkSpecialImage.h" |
16 | #include "src/core/SkWriteBuffer.h" |
17 | #if SK_SUPPORT_GPU |
18 | #include "include/private/GrRecordingContext.h" |
19 | #include "src/gpu/GrCaps.h" |
20 | #include "src/gpu/GrClip.h" |
21 | #include "src/gpu/GrColorSpaceXform.h" |
22 | #include "src/gpu/GrCoordTransform.h" |
23 | #include "src/gpu/GrRecordingContextPriv.h" |
24 | #include "src/gpu/GrRenderTargetContext.h" |
25 | #include "src/gpu/GrTexture.h" |
26 | #include "src/gpu/GrTextureProxy.h" |
27 | #include "src/gpu/SkGr.h" |
28 | #include "src/gpu/effects/GrTextureDomain.h" |
29 | #include "src/gpu/glsl/GrGLSLFragmentProcessor.h" |
30 | #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h" |
31 | #include "src/gpu/glsl/GrGLSLProgramDataManager.h" |
32 | #include "src/gpu/glsl/GrGLSLUniformHandler.h" |
33 | #endif |
34 | |
35 | namespace { |
36 | |
37 | class SkDisplacementMapEffectImpl final : public SkImageFilter_Base { |
38 | public: |
39 | SkDisplacementMapEffectImpl(SkColorChannel xChannelSelector, SkColorChannel yChannelSelector, |
40 | SkScalar scale, sk_sp<SkImageFilter> inputs[2], |
41 | const CropRect* cropRect) |
42 | : INHERITED(inputs, 2, cropRect) |
43 | , fXChannelSelector(xChannelSelector) |
44 | , fYChannelSelector(yChannelSelector) |
45 | , fScale(scale) {} |
46 | |
47 | SkRect computeFastBounds(const SkRect& src) const override; |
48 | |
49 | virtual SkIRect onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
50 | MapDirection, const SkIRect* inputRect) const override; |
51 | SkIRect onFilterNodeBounds(const SkIRect&, const SkMatrix& ctm, |
52 | MapDirection, const SkIRect* inputRect) const override; |
53 | |
54 | protected: |
55 | sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override; |
56 | |
57 | void flatten(SkWriteBuffer&) const override; |
58 | |
59 | private: |
60 | friend void SkDisplacementMapEffect::RegisterFlattenables(); |
61 | SK_FLATTENABLE_HOOKS(SkDisplacementMapEffectImpl) |
62 | |
63 | SkColorChannel fXChannelSelector; |
64 | SkColorChannel fYChannelSelector; |
65 | SkScalar fScale; |
66 | |
67 | const SkImageFilter* getDisplacementInput() const { return getInput(0); } |
68 | const SkImageFilter* getColorInput() const { return getInput(1); } |
69 | |
70 | typedef SkImageFilter_Base INHERITED; |
71 | }; |
72 | |
73 | // Shift values to extract channels from an SkColor (SkColorGetR, SkColorGetG, etc) |
74 | const uint8_t gChannelTypeToShift[] = { |
75 | 16, // R |
76 | 8, // G |
77 | 0, // B |
78 | 24, // A |
79 | }; |
80 | struct { |
81 | (SkColorChannel typeX, |
82 | SkColorChannel typeY) |
83 | : fShiftX(gChannelTypeToShift[static_cast<int>(typeX)]) |
84 | , fShiftY(gChannelTypeToShift[static_cast<int>(typeY)]) |
85 | {} |
86 | |
87 | unsigned , ; |
88 | |
89 | unsigned (SkColor c) const { return (c >> fShiftX) & 0xFF; } |
90 | unsigned (SkColor c) const { return (c >> fShiftY) & 0xFF; } |
91 | }; |
92 | |
93 | static bool channel_selector_type_is_valid(SkColorChannel cst) { |
94 | switch (cst) { |
95 | case SkColorChannel::kR: |
96 | case SkColorChannel::kG: |
97 | case SkColorChannel::kB: |
98 | case SkColorChannel::kA: |
99 | return true; |
100 | default: |
101 | break; |
102 | } |
103 | return false; |
104 | } |
105 | |
106 | static SkColorChannel convert_channel_type(SkDisplacementMapEffect::ChannelSelectorType c) { |
107 | switch(c) { |
108 | case SkDisplacementMapEffect::kR_ChannelSelectorType: |
109 | return SkColorChannel::kR; |
110 | case SkDisplacementMapEffect::kG_ChannelSelectorType: |
111 | return SkColorChannel::kG; |
112 | case SkDisplacementMapEffect::kB_ChannelSelectorType: |
113 | return SkColorChannel::kB; |
114 | case SkDisplacementMapEffect::kA_ChannelSelectorType: |
115 | return SkColorChannel::kA; |
116 | case SkDisplacementMapEffect::kUnknown_ChannelSelectorType: |
117 | default: |
118 | // Raster backend historically treated this as B, GPU backend would fail when generating |
119 | // shader code. Just return B without aborting in debug-builds in order to keep fuzzers |
120 | // happy when they pass in the technically still valid kUnknown_ChannelSelectorType. |
121 | return SkColorChannel::kB; |
122 | } |
123 | } |
124 | |
125 | } // end namespace |
126 | |
127 | /////////////////////////////////////////////////////////////////////////////// |
128 | |
129 | sk_sp<SkImageFilter> SkDisplacementMapEffect::Make(ChannelSelectorType xChannelSelector, |
130 | ChannelSelectorType yChannelSelector, |
131 | SkScalar scale, |
132 | sk_sp<SkImageFilter> displacement, |
133 | sk_sp<SkImageFilter> color, |
134 | const SkImageFilter::CropRect* cropRect) { |
135 | return Make(convert_channel_type(xChannelSelector), convert_channel_type(yChannelSelector), |
136 | scale, std::move(displacement), std::move(color), cropRect); |
137 | } |
138 | |
139 | sk_sp<SkImageFilter> SkDisplacementMapEffect::Make(SkColorChannel xChannelSelector, |
140 | SkColorChannel yChannelSelector, |
141 | SkScalar scale, |
142 | sk_sp<SkImageFilter> displacement, |
143 | sk_sp<SkImageFilter> color, |
144 | const SkImageFilter::CropRect* cropRect) { |
145 | if (!channel_selector_type_is_valid(xChannelSelector) || |
146 | !channel_selector_type_is_valid(yChannelSelector)) { |
147 | return nullptr; |
148 | } |
149 | |
150 | sk_sp<SkImageFilter> inputs[2] = { std::move(displacement), std::move(color) }; |
151 | return sk_sp<SkImageFilter>(new SkDisplacementMapEffectImpl(xChannelSelector, yChannelSelector, |
152 | scale, inputs, cropRect)); |
153 | } |
154 | |
155 | void SkDisplacementMapEffect::RegisterFlattenables() { |
156 | SK_REGISTER_FLATTENABLE(SkDisplacementMapEffectImpl); |
157 | // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name |
158 | SkFlattenable::Register("SkDisplacementMapEffect" , SkDisplacementMapEffectImpl::CreateProc); |
159 | } |
160 | |
161 | /////////////////////////////////////////////////////////////////////////////// |
162 | |
163 | sk_sp<SkFlattenable> SkDisplacementMapEffectImpl::CreateProc(SkReadBuffer& buffer) { |
164 | SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2); |
165 | |
166 | SkColorChannel xsel, ysel; |
167 | if (buffer.isVersionLT(SkPicturePriv::kCleanupImageFilterEnums_Version)) { |
168 | xsel = convert_channel_type(buffer.read32LE( |
169 | SkDisplacementMapEffect::kLast_ChannelSelectorType)); |
170 | ysel = convert_channel_type(buffer.read32LE( |
171 | SkDisplacementMapEffect::kLast_ChannelSelectorType)); |
172 | } else { |
173 | xsel = buffer.read32LE(SkColorChannel::kLastEnum); |
174 | ysel = buffer.read32LE(SkColorChannel::kLastEnum); |
175 | } |
176 | |
177 | SkScalar scale = buffer.readScalar(); |
178 | |
179 | return SkDisplacementMapEffect::Make(xsel, ysel, scale, common.getInput(0), common.getInput(1), |
180 | &common.cropRect()); |
181 | } |
182 | |
183 | void SkDisplacementMapEffectImpl::flatten(SkWriteBuffer& buffer) const { |
184 | this->INHERITED::flatten(buffer); |
185 | buffer.writeInt((int) fXChannelSelector); |
186 | buffer.writeInt((int) fYChannelSelector); |
187 | buffer.writeScalar(fScale); |
188 | } |
189 | |
190 | #if SK_SUPPORT_GPU |
191 | class GrDisplacementMapEffect : public GrFragmentProcessor { |
192 | public: |
193 | static std::unique_ptr<GrFragmentProcessor> Make( |
194 | SkColorChannel xChannelSelector, SkColorChannel yChannelSelector, SkVector scale, |
195 | GrSurfaceProxyView displacement, const SkIRect& displSubset, |
196 | const SkMatrix& offsetMatrix, GrSurfaceProxyView color, const SkIRect& colorSubset) { |
197 | return std::unique_ptr<GrFragmentProcessor>(new GrDisplacementMapEffect( |
198 | xChannelSelector, yChannelSelector, scale, std::move(displacement), displSubset, |
199 | offsetMatrix, std::move(color), colorSubset)); |
200 | } |
201 | |
202 | ~GrDisplacementMapEffect() override; |
203 | |
204 | SkColorChannel xChannelSelector() const { |
205 | return fXChannelSelector; |
206 | } |
207 | SkColorChannel yChannelSelector() const { |
208 | return fYChannelSelector; |
209 | } |
210 | const SkVector& scale() const { return fScale; } |
211 | |
212 | const char* name() const override { return "DisplacementMap" ; } |
213 | const GrTextureDomain& domain() const { return fDomain; } |
214 | |
215 | std::unique_ptr<GrFragmentProcessor> clone() const override; |
216 | |
217 | private: |
218 | GrDisplacementMapEffect(const GrDisplacementMapEffect&); |
219 | |
220 | GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
221 | |
222 | void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override; |
223 | |
224 | bool onIsEqual(const GrFragmentProcessor&) const override; |
225 | |
226 | GrDisplacementMapEffect(SkColorChannel xChannelSelector, |
227 | SkColorChannel yChannelSelector, |
228 | const SkVector& scale, GrSurfaceProxyView displacement, |
229 | const SkIRect& displSubset, const SkMatrix& offsetMatrix, |
230 | GrSurfaceProxyView color, const SkIRect& colorSubset); |
231 | |
232 | const TextureSampler& onTextureSampler(int i) const override { |
233 | return IthTextureSampler(i, fDisplacementSampler, fColorSampler); |
234 | } |
235 | |
236 | GR_DECLARE_FRAGMENT_PROCESSOR_TEST |
237 | |
238 | GrCoordTransform fDisplacementTransform; |
239 | TextureSampler fDisplacementSampler; |
240 | GrCoordTransform fColorTransform; |
241 | GrTextureDomain fDomain; |
242 | TextureSampler fColorSampler; |
243 | SkColorChannel fXChannelSelector; |
244 | SkColorChannel fYChannelSelector; |
245 | SkVector fScale; |
246 | |
247 | typedef GrFragmentProcessor INHERITED; |
248 | }; |
249 | #endif |
250 | |
251 | static void (Extractor ex, const SkVector& scale, SkBitmap* dst, |
252 | const SkBitmap& displ, const SkIPoint& offset, |
253 | const SkBitmap& src, |
254 | const SkIRect& bounds) { |
255 | static const SkScalar Inv8bit = SkScalarInvert(255); |
256 | const int srcW = src.width(); |
257 | const int srcH = src.height(); |
258 | const SkVector scaleForColor = SkVector::Make(scale.fX * Inv8bit, scale.fY * Inv8bit); |
259 | const SkVector scaleAdj = SkVector::Make(SK_ScalarHalf - scale.fX * SK_ScalarHalf, |
260 | SK_ScalarHalf - scale.fY * SK_ScalarHalf); |
261 | SkPMColor* dstPtr = dst->getAddr32(0, 0); |
262 | for (int y = bounds.top(); y < bounds.bottom(); ++y) { |
263 | const SkPMColor* displPtr = displ.getAddr32(bounds.left() + offset.fX, y + offset.fY); |
264 | for (int x = bounds.left(); x < bounds.right(); ++x, ++displPtr) { |
265 | SkColor c = SkUnPreMultiply::PMColorToColor(*displPtr); |
266 | |
267 | SkScalar displX = scaleForColor.fX * ex.getX(c) + scaleAdj.fX; |
268 | SkScalar displY = scaleForColor.fY * ex.getY(c) + scaleAdj.fY; |
269 | // Truncate the displacement values |
270 | const int32_t srcX = Sk32_sat_add(x, SkScalarTruncToInt(displX)); |
271 | const int32_t srcY = Sk32_sat_add(y, SkScalarTruncToInt(displY)); |
272 | *dstPtr++ = ((srcX < 0) || (srcX >= srcW) || (srcY < 0) || (srcY >= srcH)) ? |
273 | 0 : *(src.getAddr32(srcX, srcY)); |
274 | } |
275 | } |
276 | } |
277 | |
278 | sk_sp<SkSpecialImage> SkDisplacementMapEffectImpl::onFilterImage(const Context& ctx, |
279 | SkIPoint* offset) const { |
280 | SkIPoint colorOffset = SkIPoint::Make(0, 0); |
281 | sk_sp<SkSpecialImage> color(this->filterInput(1, ctx, &colorOffset)); |
282 | if (!color) { |
283 | return nullptr; |
284 | } |
285 | |
286 | SkIPoint displOffset = SkIPoint::Make(0, 0); |
287 | // Creation of the displacement map should happen in a non-colorspace aware context. This |
288 | // texture is a purely mathematical construct, so we want to just operate on the stored |
289 | // values. Consider: |
290 | // User supplies an sRGB displacement map. If we're rendering to a wider gamut, then we could |
291 | // end up filtering the displacement map into that gamut, which has the effect of reducing |
292 | // the amount of displacement that it represents (as encoded values move away from the |
293 | // primaries). |
294 | // With a more complex DAG attached to this input, it's not clear that working in ANY specific |
295 | // color space makes sense, so we ignore color spaces (and gamma) entirely. This may not be |
296 | // ideal, but it's at least consistent and predictable. |
297 | Context displContext(ctx.mapping(), ctx.desiredOutput(), ctx.cache(), |
298 | kN32_SkColorType, nullptr, ctx.source()); |
299 | sk_sp<SkSpecialImage> displ(this->filterInput(0, displContext, &displOffset)); |
300 | if (!displ) { |
301 | return nullptr; |
302 | } |
303 | |
304 | const SkIRect srcBounds = SkIRect::MakeXYWH(colorOffset.x(), colorOffset.y(), |
305 | color->width(), color->height()); |
306 | |
307 | // Both paths do bounds checking on color pixel access, we don't need to |
308 | // pad the color bitmap to bounds here. |
309 | SkIRect bounds; |
310 | if (!this->applyCropRect(ctx, srcBounds, &bounds)) { |
311 | return nullptr; |
312 | } |
313 | |
314 | SkIRect displBounds; |
315 | displ = this->applyCropRectAndPad(ctx, displ.get(), &displOffset, &displBounds); |
316 | if (!displ) { |
317 | return nullptr; |
318 | } |
319 | |
320 | if (!bounds.intersect(displBounds)) { |
321 | return nullptr; |
322 | } |
323 | |
324 | const SkIRect colorBounds = bounds.makeOffset(-colorOffset); |
325 | // If the offset overflowed (saturated) then we have to abort, as we need their |
326 | // dimensions to be equal. See https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7209 |
327 | if (colorBounds.size() != bounds.size()) { |
328 | return nullptr; |
329 | } |
330 | |
331 | SkVector scale = SkVector::Make(fScale, fScale); |
332 | ctx.ctm().mapVectors(&scale, 1); |
333 | |
334 | #if SK_SUPPORT_GPU |
335 | if (ctx.gpuBacked()) { |
336 | auto context = ctx.getContext(); |
337 | |
338 | GrSurfaceProxyView colorView = color->view(context); |
339 | GrSurfaceProxyView displView = displ->view(context); |
340 | if (!colorView.proxy() || !displView.proxy()) { |
341 | return nullptr; |
342 | } |
343 | const auto isProtected = colorView.proxy()->isProtected(); |
344 | |
345 | SkMatrix offsetMatrix = SkMatrix::MakeTrans(SkIntToScalar(colorOffset.fX - displOffset.fX), |
346 | SkIntToScalar(colorOffset.fY - displOffset.fY)); |
347 | |
348 | std::unique_ptr<GrFragmentProcessor> fp = |
349 | GrDisplacementMapEffect::Make(fXChannelSelector, |
350 | fYChannelSelector, |
351 | scale, |
352 | std::move(displView), |
353 | displ->subset(), |
354 | offsetMatrix, |
355 | std::move(colorView), |
356 | color->subset()); |
357 | fp = GrColorSpaceXformEffect::Make(std::move(fp), color->getColorSpace(), |
358 | color->alphaType(), ctx.colorSpace()); |
359 | |
360 | GrPaint paint; |
361 | paint.addColorFragmentProcessor(std::move(fp)); |
362 | paint.setPorterDuffXPFactory(SkBlendMode::kSrc); |
363 | SkMatrix matrix; |
364 | matrix.setTranslate(-SkIntToScalar(colorBounds.x()), -SkIntToScalar(colorBounds.y())); |
365 | |
366 | auto renderTargetContext = GrRenderTargetContext::Make( |
367 | context, ctx.grColorType(), ctx.refColorSpace(), SkBackingFit::kApprox, |
368 | bounds.size(), 1, GrMipMapped::kNo, isProtected, kBottomLeft_GrSurfaceOrigin); |
369 | if (!renderTargetContext) { |
370 | return nullptr; |
371 | } |
372 | |
373 | renderTargetContext->drawRect(GrNoClip(), std::move(paint), GrAA::kNo, matrix, |
374 | SkRect::Make(colorBounds)); |
375 | |
376 | offset->fX = bounds.left(); |
377 | offset->fY = bounds.top(); |
378 | return SkSpecialImage::MakeDeferredFromGpu( |
379 | context, |
380 | SkIRect::MakeWH(bounds.width(), bounds.height()), |
381 | kNeedNewImageUniqueID_SpecialImage, |
382 | renderTargetContext->readSurfaceView(), |
383 | renderTargetContext->colorInfo().colorType(), |
384 | renderTargetContext->colorInfo().refColorSpace()); |
385 | } |
386 | #endif |
387 | |
388 | SkBitmap colorBM, displBM; |
389 | |
390 | if (!color->getROPixels(&colorBM) || !displ->getROPixels(&displBM)) { |
391 | return nullptr; |
392 | } |
393 | |
394 | if ((colorBM.colorType() != kN32_SkColorType) || |
395 | (displBM.colorType() != kN32_SkColorType)) { |
396 | return nullptr; |
397 | } |
398 | |
399 | if (!colorBM.getPixels() || !displBM.getPixels()) { |
400 | return nullptr; |
401 | } |
402 | |
403 | SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(), |
404 | colorBM.alphaType()); |
405 | |
406 | SkBitmap dst; |
407 | if (!dst.tryAllocPixels(info)) { |
408 | return nullptr; |
409 | } |
410 | |
411 | compute_displacement(Extractor(fXChannelSelector, fYChannelSelector), scale, &dst, |
412 | displBM, colorOffset - displOffset, colorBM, colorBounds); |
413 | |
414 | offset->fX = bounds.left(); |
415 | offset->fY = bounds.top(); |
416 | return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()), |
417 | dst); |
418 | } |
419 | |
420 | SkRect SkDisplacementMapEffectImpl::computeFastBounds(const SkRect& src) const { |
421 | SkRect bounds = this->getColorInput() ? this->getColorInput()->computeFastBounds(src) : src; |
422 | bounds.outset(SkScalarAbs(fScale) * SK_ScalarHalf, SkScalarAbs(fScale) * SK_ScalarHalf); |
423 | return bounds; |
424 | } |
425 | |
426 | SkIRect SkDisplacementMapEffectImpl::onFilterNodeBounds( |
427 | const SkIRect& src, const SkMatrix& ctm, MapDirection, const SkIRect* inputRect) const { |
428 | SkVector scale = SkVector::Make(fScale, fScale); |
429 | ctm.mapVectors(&scale, 1); |
430 | return src.makeOutset(SkScalarCeilToInt(SkScalarAbs(scale.fX) * SK_ScalarHalf), |
431 | SkScalarCeilToInt(SkScalarAbs(scale.fY) * SK_ScalarHalf)); |
432 | } |
433 | |
434 | SkIRect SkDisplacementMapEffectImpl::onFilterBounds( |
435 | const SkIRect& src, const SkMatrix& ctm, MapDirection dir, const SkIRect* inputRect) const { |
436 | // Recurse only into color input. |
437 | if (this->getColorInput()) { |
438 | return this->getColorInput()->filterBounds(src, ctm, dir, inputRect); |
439 | } |
440 | return src; |
441 | } |
442 | |
443 | /////////////////////////////////////////////////////////////////////////////// |
444 | |
445 | #if SK_SUPPORT_GPU |
446 | class GrGLDisplacementMapEffect : public GrGLSLFragmentProcessor { |
447 | public: |
448 | void emitCode(EmitArgs&) override; |
449 | |
450 | static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*); |
451 | |
452 | protected: |
453 | void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override; |
454 | |
455 | private: |
456 | typedef GrGLSLProgramDataManager::UniformHandle UniformHandle; |
457 | |
458 | UniformHandle fScaleUni; |
459 | GrTextureDomain::GLDomain fGLDomain; |
460 | |
461 | typedef GrGLSLFragmentProcessor INHERITED; |
462 | }; |
463 | |
464 | /////////////////////////////////////////////////////////////////////////////// |
465 | |
466 | GrGLSLFragmentProcessor* GrDisplacementMapEffect::onCreateGLSLInstance() const { |
467 | return new GrGLDisplacementMapEffect; |
468 | } |
469 | |
470 | void GrDisplacementMapEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps, |
471 | GrProcessorKeyBuilder* b) const { |
472 | GrGLDisplacementMapEffect::GenKey(*this, caps, b); |
473 | } |
474 | |
475 | GrDisplacementMapEffect::GrDisplacementMapEffect( |
476 | SkColorChannel xChannelSelector, |
477 | SkColorChannel yChannelSelector, |
478 | const SkVector& scale, |
479 | GrSurfaceProxyView displacement, |
480 | const SkIRect& displSubset, |
481 | const SkMatrix& offsetMatrix, |
482 | GrSurfaceProxyView color, |
483 | const SkIRect& colorSubset) |
484 | : INHERITED(kGrDisplacementMapEffect_ClassID, |
485 | GrFragmentProcessor::kNone_OptimizationFlags) |
486 | , fDisplacementTransform( |
487 | SkMatrix::Concat(SkMatrix::MakeTrans(displSubset.x(), displSubset.y()), |
488 | offsetMatrix), |
489 | displacement.proxy(), displacement.origin()) |
490 | , fDisplacementSampler(std::move(displacement)) |
491 | , fColorTransform(SkMatrix::MakeTrans(colorSubset.x(), colorSubset.y()), color.proxy(), |
492 | color.origin()) |
493 | , fDomain(color.proxy(), |
494 | GrTextureDomain::MakeTexelDomain(colorSubset, |
495 | GrTextureDomain::kDecal_Mode), |
496 | GrTextureDomain::kDecal_Mode, GrTextureDomain::kDecal_Mode) |
497 | , fColorSampler(std::move(color)) |
498 | , fXChannelSelector(xChannelSelector) |
499 | , fYChannelSelector(yChannelSelector) |
500 | , fScale(scale) { |
501 | this->addCoordTransform(&fDisplacementTransform); |
502 | this->addCoordTransform(&fColorTransform); |
503 | this->setTextureSamplerCnt(2); |
504 | } |
505 | |
506 | GrDisplacementMapEffect::GrDisplacementMapEffect(const GrDisplacementMapEffect& that) |
507 | : INHERITED(kGrDisplacementMapEffect_ClassID, that.optimizationFlags()) |
508 | , fDisplacementTransform(that.fDisplacementTransform) |
509 | , fDisplacementSampler(that.fDisplacementSampler) |
510 | , fColorTransform(that.fColorTransform) |
511 | , fDomain(that.fDomain) |
512 | , fColorSampler(that.fColorSampler) |
513 | , fXChannelSelector(that.fXChannelSelector) |
514 | , fYChannelSelector(that.fYChannelSelector) |
515 | , fScale(that.fScale) { |
516 | this->addCoordTransform(&fDisplacementTransform); |
517 | this->addCoordTransform(&fColorTransform); |
518 | this->setTextureSamplerCnt(2); |
519 | } |
520 | |
521 | GrDisplacementMapEffect::~GrDisplacementMapEffect() {} |
522 | |
523 | std::unique_ptr<GrFragmentProcessor> GrDisplacementMapEffect::clone() const { |
524 | return std::unique_ptr<GrFragmentProcessor>(new GrDisplacementMapEffect(*this)); |
525 | } |
526 | |
527 | bool GrDisplacementMapEffect::onIsEqual(const GrFragmentProcessor& sBase) const { |
528 | const GrDisplacementMapEffect& s = sBase.cast<GrDisplacementMapEffect>(); |
529 | return fXChannelSelector == s.fXChannelSelector && |
530 | fYChannelSelector == s.fYChannelSelector && |
531 | fScale == s.fScale; |
532 | } |
533 | |
534 | /////////////////////////////////////////////////////////////////////////////// |
535 | |
536 | GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrDisplacementMapEffect); |
537 | |
538 | #if GR_TEST_UTILS |
539 | std::unique_ptr<GrFragmentProcessor> GrDisplacementMapEffect::TestCreate(GrProcessorTestData* d) { |
540 | auto [dispView, ct1, at1] = d->randomView(); |
541 | auto [colorView, ct2, at2] = d->randomView(); |
542 | static const int kMaxComponent = static_cast<int>(SkColorChannel::kLastEnum); |
543 | SkColorChannel xChannelSelector = |
544 | static_cast<SkColorChannel>(d->fRandom->nextRangeU(1, kMaxComponent)); |
545 | SkColorChannel yChannelSelector = |
546 | static_cast<SkColorChannel>(d->fRandom->nextRangeU(1, kMaxComponent)); |
547 | SkVector scale = SkVector::Make(d->fRandom->nextRangeScalar(0, 100.0f), |
548 | d->fRandom->nextRangeScalar(0, 100.0f)); |
549 | SkISize colorDimensions; |
550 | colorDimensions.fWidth = d->fRandom->nextRangeU(0, colorView.width()); |
551 | colorDimensions.fHeight = d->fRandom->nextRangeU(0, colorView.height()); |
552 | SkIRect dispRect = SkIRect::MakeSize(dispView.dimensions()); |
553 | |
554 | return GrDisplacementMapEffect::Make(xChannelSelector, yChannelSelector, scale, |
555 | std::move(dispView), |
556 | dispRect, |
557 | SkMatrix::I(), |
558 | std::move(colorView), SkIRect::MakeSize(colorDimensions)); |
559 | } |
560 | |
561 | #endif |
562 | |
563 | /////////////////////////////////////////////////////////////////////////////// |
564 | |
565 | void GrGLDisplacementMapEffect::emitCode(EmitArgs& args) { |
566 | const GrDisplacementMapEffect& displacementMap = args.fFp.cast<GrDisplacementMapEffect>(); |
567 | const GrTextureDomain& domain = displacementMap.domain(); |
568 | |
569 | fScaleUni = args.fUniformHandler->addUniform(&displacementMap, kFragment_GrShaderFlag, |
570 | kHalf2_GrSLType, "Scale" ); |
571 | const char* scaleUni = args.fUniformHandler->getUniformCStr(fScaleUni); |
572 | const char* dColor = "dColor" ; |
573 | const char* cCoords = "cCoords" ; |
574 | const char* nearZero = "1e-6" ; // Since 6.10352e-5 is the smallest half float, use |
575 | // a number smaller than that to approximate 0, but |
576 | // leave room for 32-bit float GPU rounding errors. |
577 | |
578 | GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
579 | fragBuilder->codeAppendf("\t\thalf4 %s = " , dColor); |
580 | fragBuilder->appendTextureLookup(args.fTexSamplers[0], |
581 | args.fTransformedCoords[0].fVaryingPoint.c_str()); |
582 | fragBuilder->codeAppend(";\n" ); |
583 | |
584 | // Unpremultiply the displacement |
585 | fragBuilder->codeAppendf( |
586 | "\t\t%s.rgb = (%s.a < %s) ? half3(0.0) : saturate(%s.rgb / %s.a);" , |
587 | dColor, dColor, nearZero, dColor, dColor); |
588 | SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[1].fVaryingPoint); |
589 | fragBuilder->codeAppendf("\t\tfloat2 %s = %s + %s*(%s." , |
590 | cCoords, coords2D.c_str(), scaleUni, dColor); |
591 | |
592 | switch (displacementMap.xChannelSelector()) { |
593 | case SkColorChannel::kR: |
594 | fragBuilder->codeAppend("r" ); |
595 | break; |
596 | case SkColorChannel::kG: |
597 | fragBuilder->codeAppend("g" ); |
598 | break; |
599 | case SkColorChannel::kB: |
600 | fragBuilder->codeAppend("b" ); |
601 | break; |
602 | case SkColorChannel::kA: |
603 | fragBuilder->codeAppend("a" ); |
604 | break; |
605 | default: |
606 | SkDEBUGFAIL("Unknown X channel selector" ); |
607 | } |
608 | |
609 | switch (displacementMap.yChannelSelector()) { |
610 | case SkColorChannel::kR: |
611 | fragBuilder->codeAppend("r" ); |
612 | break; |
613 | case SkColorChannel::kG: |
614 | fragBuilder->codeAppend("g" ); |
615 | break; |
616 | case SkColorChannel::kB: |
617 | fragBuilder->codeAppend("b" ); |
618 | break; |
619 | case SkColorChannel::kA: |
620 | fragBuilder->codeAppend("a" ); |
621 | break; |
622 | default: |
623 | SkDEBUGFAIL("Unknown Y channel selector" ); |
624 | } |
625 | fragBuilder->codeAppend("-half2(0.5));\t\t" ); |
626 | |
627 | fGLDomain.sampleTexture(&displacementMap, |
628 | fragBuilder, |
629 | args.fUniformHandler, |
630 | args.fShaderCaps, |
631 | domain, |
632 | args.fOutputColor, |
633 | SkString(cCoords), |
634 | args.fTexSamplers[1]); |
635 | fragBuilder->codeAppend(";\n" ); |
636 | } |
637 | |
638 | void GrGLDisplacementMapEffect::onSetData(const GrGLSLProgramDataManager& pdman, |
639 | const GrFragmentProcessor& proc) { |
640 | const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
641 | const auto& view = displacementMap.textureSampler(1).view(); |
642 | SkISize texDimensions = view.proxy()->backingStoreDimensions(); |
643 | |
644 | SkScalar scaleX = displacementMap.scale().fX / texDimensions.width(); |
645 | SkScalar scaleY = displacementMap.scale().fY / texDimensions.height(); |
646 | pdman.set2f(fScaleUni, SkScalarToFloat(scaleX), |
647 | view.origin() == kTopLeft_GrSurfaceOrigin ? |
648 | SkScalarToFloat(scaleY) : SkScalarToFloat(-scaleY)); |
649 | fGLDomain.setData(pdman, displacementMap.domain(), view, |
650 | displacementMap.textureSampler(1).samplerState()); |
651 | } |
652 | |
653 | void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc, |
654 | const GrShaderCaps&, GrProcessorKeyBuilder* b) { |
655 | const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>(); |
656 | |
657 | static constexpr int kChannelSelectorKeyBits = 2; // Max value is 3, so 2 bits are required |
658 | |
659 | uint32_t xKey = static_cast<uint32_t>(displacementMap.xChannelSelector()); |
660 | uint32_t yKey = static_cast<uint32_t>(displacementMap.yChannelSelector()) |
661 | << kChannelSelectorKeyBits; |
662 | |
663 | b->add32(xKey | yKey); |
664 | } |
665 | #endif |
666 | |