| /* |
| * Copyright 2012 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkMagnifierImageFilter.h" |
| |
| #include "SkBitmap.h" |
| #include "SkColorPriv.h" |
| #include "SkReadBuffer.h" |
| #include "SkSpecialImage.h" |
| #include "SkWriteBuffer.h" |
| #include "SkValidationUtils.h" |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| #if SK_SUPPORT_GPU |
| #include "GrContext.h" |
| #include "GrDrawContext.h" |
| #include "GrInvariantOutput.h" |
| #include "effects/GrSingleTextureEffect.h" |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLProgramDataManager.h" |
| #include "glsl/GrGLSLUniformHandler.h" |
| |
| class GrMagnifierEffect : public GrSingleTextureEffect { |
| |
| public: |
| static sk_sp<GrFragmentProcessor> Make(GrTexture* texture, |
| const SkRect& bounds, |
| float xOffset, |
| float yOffset, |
| float xInvZoom, |
| float yInvZoom, |
| float xInvInset, |
| float yInvInset) { |
| return sk_sp<GrFragmentProcessor>(new GrMagnifierEffect(texture, bounds, |
| xOffset, yOffset, |
| xInvZoom, yInvZoom, |
| xInvInset, yInvInset)); |
| } |
| |
| ~GrMagnifierEffect() override {}; |
| |
| const char* name() const override { return "Magnifier"; } |
| |
| const SkRect& bounds() const { return fBounds; } // Bounds of source image. |
| // Offset to apply to zoomed pixels, (srcRect position / texture size). |
| float xOffset() const { return fXOffset; } |
| float yOffset() const { return fYOffset; } |
| |
| // Scale to apply to zoomed pixels (srcRect size / bounds size). |
| float xInvZoom() const { return fXInvZoom; } |
| float yInvZoom() const { return fYInvZoom; } |
| |
| // 1/radius over which to transition from unzoomed to zoomed pixels (bounds size / inset). |
| float xInvInset() const { return fXInvInset; } |
| float yInvInset() const { return fYInvInset; } |
| |
| private: |
| GrMagnifierEffect(GrTexture* texture, |
| const SkRect& bounds, |
| float xOffset, |
| float yOffset, |
| float xInvZoom, |
| float yInvZoom, |
| float xInvInset, |
| float yInvInset) |
| : INHERITED(texture, nullptr, GrCoordTransform::MakeDivByTextureWHMatrix(texture)) |
| , fBounds(bounds) |
| , fXOffset(xOffset) |
| , fYOffset(yOffset) |
| , fXInvZoom(xInvZoom) |
| , fYInvZoom(yInvZoom) |
| , fXInvInset(xInvInset) |
| , fYInvInset(yInvInset) { |
| this->initClassID<GrMagnifierEffect>(); |
| } |
| |
| GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
| |
| void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override; |
| |
| bool onIsEqual(const GrFragmentProcessor&) const override; |
| |
| void onComputeInvariantOutput(GrInvariantOutput* inout) const override; |
| |
| GR_DECLARE_FRAGMENT_PROCESSOR_TEST; |
| |
| SkRect fBounds; |
| float fXOffset; |
| float fYOffset; |
| float fXInvZoom; |
| float fYInvZoom; |
| float fXInvInset; |
| float fYInvInset; |
| |
| typedef GrSingleTextureEffect INHERITED; |
| }; |
| |
| // For brevity |
| typedef GrGLSLProgramDataManager::UniformHandle UniformHandle; |
| |
| class GrGLMagnifierEffect : public GrGLSLFragmentProcessor { |
| public: |
| void emitCode(EmitArgs&) override; |
| |
| protected: |
| void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override; |
| |
| private: |
| UniformHandle fOffsetVar; |
| UniformHandle fInvZoomVar; |
| UniformHandle fInvInsetVar; |
| UniformHandle fBoundsVar; |
| |
| typedef GrGLSLFragmentProcessor INHERITED; |
| }; |
| |
| void GrGLMagnifierEffect::emitCode(EmitArgs& args) { |
| GrGLSLUniformHandler* uniformHandler = args.fUniformHandler; |
| fOffsetVar = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "Offset"); |
| fInvZoomVar = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "InvZoom"); |
| fInvInsetVar = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "InvInset"); |
| fBoundsVar = uniformHandler->addUniform(kFragment_GrShaderFlag, |
| kVec4f_GrSLType, kDefault_GrSLPrecision, |
| "Bounds"); |
| |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0); |
| fragBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); |
| fragBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n", |
| uniformHandler->getUniformCStr(fOffsetVar), |
| coords2D.c_str(), |
| uniformHandler->getUniformCStr(fInvZoomVar)); |
| const char* bounds = uniformHandler->getUniformCStr(fBoundsVar); |
| fragBuilder->codeAppendf("\t\tvec2 delta = (coord - %s.xy) * %s.zw;\n", bounds, bounds); |
| fragBuilder->codeAppendf("\t\tdelta = min(delta, vec2(1.0, 1.0) - delta);\n"); |
| fragBuilder->codeAppendf("\t\tdelta = delta * %s;\n", |
| uniformHandler->getUniformCStr(fInvInsetVar)); |
| |
| fragBuilder->codeAppend("\t\tfloat weight = 0.0;\n"); |
| fragBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); |
| fragBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); |
| fragBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n"); |
| fragBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n"); |
| fragBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n"); |
| fragBuilder->codeAppend("\t\t} else {\n"); |
| fragBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n"); |
| fragBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n"); |
| fragBuilder->codeAppend("\t\t}\n"); |
| |
| fragBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); |
| fragBuilder->codeAppend("\t\tvec4 output_color = "); |
| fragBuilder->appendTextureLookup(args.fTexSamplers[0], "mix_coord"); |
| fragBuilder->codeAppend(";\n"); |
| |
| fragBuilder->codeAppendf("\t\t%s = output_color;", args.fOutputColor); |
| SkString modulate; |
| GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor); |
| fragBuilder->codeAppend(modulate.c_str()); |
| } |
| |
| void GrGLMagnifierEffect::onSetData(const GrGLSLProgramDataManager& pdman, |
| const GrProcessor& effect) { |
| const GrMagnifierEffect& zoom = effect.cast<GrMagnifierEffect>(); |
| pdman.set2f(fOffsetVar, zoom.xOffset(), zoom.yOffset()); |
| pdman.set2f(fInvZoomVar, zoom.xInvZoom(), zoom.yInvZoom()); |
| pdman.set2f(fInvInsetVar, zoom.xInvInset(), zoom.yInvInset()); |
| pdman.set4f(fBoundsVar, zoom.bounds().x(), zoom.bounds().y(), |
| zoom.bounds().width(), zoom.bounds().height()); |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| void GrMagnifierEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLMagnifierEffect::GenKey(*this, caps, b); |
| } |
| |
| GrGLSLFragmentProcessor* GrMagnifierEffect::onCreateGLSLInstance() const { |
| return new GrGLMagnifierEffect; |
| } |
| |
| GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMagnifierEffect); |
| |
| sk_sp<GrFragmentProcessor> GrMagnifierEffect::TestCreate(GrProcessorTestData* d) { |
| GrTexture* texture = d->fTextures[0]; |
| const int kMaxWidth = 200; |
| const int kMaxHeight = 200; |
| const int kMaxInset = 20; |
| uint32_t width = d->fRandom->nextULessThan(kMaxWidth); |
| uint32_t height = d->fRandom->nextULessThan(kMaxHeight); |
| uint32_t x = d->fRandom->nextULessThan(kMaxWidth - width); |
| uint32_t y = d->fRandom->nextULessThan(kMaxHeight - height); |
| uint32_t inset = d->fRandom->nextULessThan(kMaxInset); |
| |
| sk_sp<GrFragmentProcessor> effect(GrMagnifierEffect::Make( |
| texture, |
| SkRect::MakeWH(SkIntToScalar(kMaxWidth), SkIntToScalar(kMaxHeight)), |
| (float) width / texture->width(), |
| (float) height / texture->height(), |
| texture->width() / (float) x, |
| texture->height() / (float) y, |
| (float) inset / texture->width(), |
| (float) inset / texture->height())); |
| SkASSERT(effect); |
| return effect; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool GrMagnifierEffect::onIsEqual(const GrFragmentProcessor& sBase) const { |
| const GrMagnifierEffect& s = sBase.cast<GrMagnifierEffect>(); |
| return (this->fBounds == s.fBounds && |
| this->fXOffset == s.fXOffset && |
| this->fYOffset == s.fYOffset && |
| this->fXInvZoom == s.fXInvZoom && |
| this->fYInvZoom == s.fYInvZoom && |
| this->fXInvInset == s.fXInvInset && |
| this->fYInvInset == s.fYInvInset); |
| } |
| |
| void GrMagnifierEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const { |
| this->updateInvariantOutputForModulation(inout); |
| } |
| |
| #endif |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkImageFilter> SkMagnifierImageFilter::Make(const SkRect& srcRect, SkScalar inset, |
| sk_sp<SkImageFilter> input, |
| const CropRect* cropRect) { |
| |
| if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) { |
| return nullptr; |
| } |
| // Negative numbers in src rect are not supported |
| if (srcRect.fLeft < 0 || srcRect.fTop < 0) { |
| return nullptr; |
| } |
| return sk_sp<SkImageFilter>(new SkMagnifierImageFilter(srcRect, inset, |
| std::move(input), |
| cropRect)); |
| } |
| |
| |
| SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, |
| SkScalar inset, |
| sk_sp<SkImageFilter> input, |
| const CropRect* cropRect) |
| : INHERITED(&input, 1, cropRect) |
| , fSrcRect(srcRect) |
| , fInset(inset) { |
| SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); |
| } |
| |
| sk_sp<SkFlattenable> SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); |
| SkRect src; |
| buffer.readRect(&src); |
| return Make(src, buffer.readScalar(), common.getInput(0), &common.cropRect()); |
| } |
| |
| void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeRect(fSrcRect); |
| buffer.writeScalar(fInset); |
| } |
| |
| sk_sp<SkSpecialImage> SkMagnifierImageFilter::onFilterImage(SkSpecialImage* source, |
| const Context& ctx, |
| SkIPoint* offset) const { |
| SkIPoint inputOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset)); |
| if (!input) { |
| return nullptr; |
| } |
| |
| const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(), |
| input->width(), input->height()); |
| |
| SkIRect bounds; |
| if (!this->applyCropRect(ctx, inputBounds, &bounds)) { |
| return nullptr; |
| } |
| |
| SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; |
| |
| SkScalar invXZoom = fSrcRect.width() / bounds.width(); |
| SkScalar invYZoom = fSrcRect.height() / bounds.height(); |
| |
| |
| #if SK_SUPPORT_GPU |
| if (source->isTextureBacked()) { |
| GrContext* context = source->getContext(); |
| |
| sk_sp<GrTexture> inputTexture(input->asTextureRef(context)); |
| SkASSERT(inputTexture); |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| bounds.offset(-inputOffset); |
| |
| SkScalar yOffset = inputTexture->origin() == kTopLeft_GrSurfaceOrigin |
| ? fSrcRect.y() |
| : inputTexture->height() - |
| fSrcRect.height() * inputTexture->height() / bounds.height() - fSrcRect.y(); |
| int boundsY = inputTexture->origin() == kTopLeft_GrSurfaceOrigin |
| ? bounds.y() |
| : inputTexture->height() - bounds.height(); |
| SkRect effectBounds = SkRect::MakeXYWH( |
| SkIntToScalar(bounds.x()) / inputTexture->width(), |
| SkIntToScalar(boundsY) / inputTexture->height(), |
| SkIntToScalar(inputTexture->width()) / bounds.width(), |
| SkIntToScalar(inputTexture->height()) / bounds.height()); |
| // SRGBTODO: Handle sRGB here |
| sk_sp<GrFragmentProcessor> fp(GrMagnifierEffect::Make( |
| inputTexture.get(), |
| effectBounds, |
| fSrcRect.x() / inputTexture->width(), |
| yOffset / inputTexture->height(), |
| invXZoom, |
| invYZoom, |
| bounds.width() * invInset, |
| bounds.height() * invInset)); |
| if (!fp) { |
| return nullptr; |
| } |
| |
| return DrawWithFP(context, std::move(fp), bounds); |
| } |
| #endif |
| |
| SkBitmap inputBM; |
| |
| if (!input->getROPixels(&inputBM)) { |
| return nullptr; |
| } |
| |
| if ((inputBM.colorType() != kN32_SkColorType) || |
| (fSrcRect.width() >= inputBM.width()) || (fSrcRect.height() >= inputBM.height())) { |
| return nullptr; |
| } |
| |
| SkAutoLockPixels alp(inputBM); |
| SkASSERT(inputBM.getPixels()); |
| if (!inputBM.getPixels() || inputBM.width() <= 0 || inputBM.height() <= 0) { |
| return nullptr; |
| } |
| |
| const SkImageInfo info = SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()); |
| |
| SkBitmap dst; |
| if (!dst.tryAllocPixels(info)) { |
| return nullptr; |
| } |
| |
| SkAutoLockPixels dstLock(dst); |
| |
| SkColor* dptr = dst.getAddr32(0, 0); |
| int dstWidth = dst.width(), dstHeight = dst.height(); |
| for (int y = 0; y < dstHeight; ++y) { |
| for (int x = 0; x < dstWidth; ++x) { |
| SkScalar x_dist = SkMin32(x, dstWidth - x - 1) * invInset; |
| SkScalar y_dist = SkMin32(y, dstHeight - y - 1) * invInset; |
| SkScalar weight = 0; |
| |
| static const SkScalar kScalar2 = SkScalar(2); |
| |
| // To create a smooth curve at the corners, we need to work on |
| // a square twice the size of the inset. |
| if (x_dist < kScalar2 && y_dist < kScalar2) { |
| x_dist = kScalar2 - x_dist; |
| y_dist = kScalar2 - y_dist; |
| |
| SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + |
| SkScalarSquare(y_dist)); |
| dist = SkMaxScalar(kScalar2 - dist, 0); |
| weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1); |
| } else { |
| SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist), |
| SkScalarSquare(y_dist)); |
| weight = SkMinScalar(sqDist, SK_Scalar1); |
| } |
| |
| SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * invXZoom)) + |
| (SK_Scalar1 - weight) * x; |
| SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * invYZoom)) + |
| (SK_Scalar1 - weight) * y; |
| |
| int x_val = SkTPin(bounds.x() + SkScalarFloorToInt(x_interp), 0, inputBM.width() - 1); |
| int y_val = SkTPin(bounds.y() + SkScalarFloorToInt(y_interp), 0, inputBM.height() - 1); |
| |
| *dptr = *inputBM.getAddr32(x_val, y_val); |
| dptr++; |
| } |
| } |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()), |
| dst); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkMagnifierImageFilter::toString(SkString* str) const { |
| str->appendf("SkMagnifierImageFilter: ("); |
| str->appendf("src: (%f,%f,%f,%f) ", |
| fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom); |
| str->appendf("inset: %f", fInset); |
| str->append(")"); |
| } |
| #endif |