| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkBlendMode.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageFilter.h" |
| #include "include/core/SkImageInfo.h" |
| #include "include/core/SkMaskFilter.h" |
| #include "include/core/SkMatrix.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkRRect.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTypes.h" |
| #include "include/effects/SkColorMatrix.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/effects/SkHighContrastFilter.h" |
| #include "include/effects/SkImageFilters.h" |
| #include "include/effects/SkShaderMaskFilter.h" |
| #include "include/gpu/GrDirectContext.h" |
| #include "include/gpu/ganesh/SkImageGanesh.h" |
| #include "tools/Resources.h" |
| #include "tools/ToolUtils.h" |
| |
| #include <utility> |
| |
| /** |
| * Test drawing a primitive w/ an imagefilter (in this case, just matrix w/ identity) to see |
| * that we apply the xfermode *after* the image has been created and filtered, and not during |
| * the creation step (i.e. before it is filtered). |
| * |
| * see https://bug.skia.org/3741 |
| */ |
| static void do_draw(SkCanvas* canvas, SkBlendMode mode, sk_sp<SkImageFilter> imf) { |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->clipRect(SkRect::MakeWH(220, 220)); |
| |
| // want to force a layer, so modes like DstIn can combine meaningfully, but the final |
| // image can still be shown against our default (opaque) background. non-opaque GMs |
| // are a lot more trouble to compare/triage. |
| canvas->saveLayer(nullptr, nullptr); |
| canvas->drawColor(SK_ColorGREEN); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| SkRect r0 = SkRect::MakeXYWH(10, 60, 200, 100); |
| SkRect r1 = SkRect::MakeXYWH(60, 10, 100, 200); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->drawOval(r0, paint); |
| |
| paint.setColor(0x660000FF); |
| paint.setImageFilter(std::move(imf)); |
| paint.setBlendMode(mode); |
| canvas->drawOval(r1, paint); |
| } |
| |
| DEF_SIMPLE_GM(imagefilters_xfermodes, canvas, 480, 480) { |
| canvas->translate(10, 10); |
| |
| // just need an imagefilter to trigger the code-path (which creates a tmp layer) |
| sk_sp<SkImageFilter> imf(SkImageFilters::MatrixTransform(SkMatrix::I(), |
| SkSamplingOptions(), |
| nullptr)); |
| |
| const SkBlendMode modes[] = { |
| SkBlendMode::kSrcATop, SkBlendMode::kDstIn |
| }; |
| |
| for (size_t i = 0; i < std::size(modes); ++i) { |
| canvas->save(); |
| do_draw(canvas, modes[i], nullptr); |
| canvas->translate(240, 0); |
| do_draw(canvas, modes[i], imf); |
| canvas->restore(); |
| |
| canvas->translate(0, 240); |
| } |
| } |
| |
| static sk_sp<SkImage> make_image(SkCanvas* canvas) { |
| const SkImageInfo info = SkImageInfo::MakeS32(100, 100, kPremul_SkAlphaType); |
| auto surface(ToolUtils::makeSurface(canvas, info)); |
| surface->getCanvas()->drawRect(SkRect::MakeXYWH(25, 25, 50, 50), SkPaint()); |
| return surface->makeImageSnapshot(); |
| } |
| |
| // Compare blurs when we're tightly clipped (fast) and not as tightly (slower) |
| // |
| // Expect the two to draw the same (modulo the extra border of pixels when the clip is larger) |
| // |
| DEF_SIMPLE_GM(fast_slow_blurimagefilter, canvas, 620, 260) { |
| sk_sp<SkImage> image(make_image(canvas)); |
| const SkRect r = SkRect::MakeIWH(image->width(), image->height()); |
| |
| canvas->translate(10, 10); |
| for (SkScalar sigma = 8; sigma <= 128; sigma *= 2) { |
| SkPaint paint; |
| paint.setImageFilter(SkImageFilters::Blur(sigma, sigma, nullptr)); |
| |
| canvas->save(); |
| // we outset the clip by 1, to fall out of the fast-case in drawImage |
| // i.e. the clip is larger than the image |
| for (SkScalar outset = 0; outset <= 1; ++outset) { |
| canvas->save(); |
| canvas->clipRect(r.makeOutset(outset, outset)); |
| canvas->drawImage(image, 0, 0, SkSamplingOptions(), &paint); |
| canvas->restore(); |
| canvas->translate(0, r.height() + 20); |
| } |
| canvas->restore(); |
| canvas->translate(r.width() + 20, 0); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static void draw_set(SkCanvas* canvas, sk_sp<SkImageFilter> filters[], int count) { |
| const SkRect r = SkRect::MakeXYWH(30, 30, 200, 200); |
| const SkScalar offset = 250; |
| SkScalar dx = 0, dy = 0; |
| |
| for (int i = 0; i < count; ++i) { |
| canvas->save(); |
| SkRRect rr = SkRRect::MakeRectXY(r.makeOffset(dx, dy), 20, 20); |
| canvas->clipRRect(rr, true); |
| canvas->saveLayer(SkCanvas::SaveLayerRec(&rr.getBounds(), nullptr, filters[i].get(), 0)); |
| canvas->drawColor(0x40FFFFFF); |
| canvas->restore(); |
| canvas->restore(); |
| |
| if (0 == dx) { |
| dx = offset; |
| } else { |
| dx = 0; |
| dy = offset; |
| } |
| } |
| } |
| |
| class SaveLayerWithBackdropGM : public skiagm::GM { |
| protected: |
| bool runAsBench() const override { return true; } |
| SkString onShortName() override { return SkString("savelayer_with_backdrop"); } |
| SkISize onISize() override { return SkISize::Make(830, 550); } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkColorMatrix cm; |
| cm.setSaturation(10); |
| sk_sp<SkColorFilter> cf(SkColorFilters::Matrix(cm)); |
| const SkScalar kernel[] = { 4, 0, 4, 0, -15, 0, 4, 0, 4 }; |
| sk_sp<SkImageFilter> filters[] = { |
| SkImageFilters::Blur(10, 10, nullptr), |
| SkImageFilters::Dilate(8, 8, nullptr), |
| SkImageFilters::MatrixConvolution({ 3, 3 }, kernel, 1, 0, { 0, 0 }, |
| SkTileMode::kDecal, true, nullptr), |
| SkImageFilters::ColorFilter(std::move(cf), nullptr), |
| }; |
| |
| const struct { |
| SkScalar fSx, fSy, fTx, fTy; |
| } xforms[] = { |
| { 1, 1, 0, 0 }, |
| { 0.5f, 0.5f, 530, 0 }, |
| { 0.25f, 0.25f, 530, 275 }, |
| { 0.125f, 0.125f, 530, 420 }, |
| }; |
| |
| SkSamplingOptions sampling(SkFilterMode::kLinear, |
| SkMipmapMode::kLinear); |
| sk_sp<SkImage> image(GetResourceAsImage("images/mandrill_512.png")); |
| |
| canvas->translate(20, 20); |
| for (const auto& xform : xforms) { |
| canvas->save(); |
| canvas->translate(xform.fTx, xform.fTy); |
| canvas->scale(xform.fSx, xform.fSy); |
| canvas->drawImage(image, 0, 0, sampling, nullptr); |
| draw_set(canvas, filters, std::size(filters)); |
| canvas->restore(); |
| } |
| } |
| }; |
| |
| DEF_GM(return new SaveLayerWithBackdropGM();) |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| // Test that color filters and mask filters are applied before the image filter, even if it would |
| // normally be a sprite draw that could avoid an auto-saveLayer. |
| DEF_SIMPLE_GM(imagefilters_effect_order, canvas, 512, 512) { |
| sk_sp<SkImage> image(GetResourceAsImage("images/mandrill_256.png")); |
| auto direct = GrAsDirectContext(canvas->recordingContext()); |
| if (direct) { |
| if (sk_sp<SkImage> gpuImage = SkImages::TextureFromImage(direct, image)) { |
| image = std::move(gpuImage); |
| } |
| } |
| |
| SkISize kernelSize = SkISize::Make(3, 3); |
| SkIPoint kernelOffset = SkIPoint::Make(1, 1); |
| // A Laplacian edge detector, ie https://en.wikipedia.org/wiki/Kernel_(image_processing) |
| SkScalar kernel[9] = {-1.f, -1.f, -1.f, |
| -1.f, 8.f, -1.f, |
| -1.f, -1.f, -1.f}; |
| auto edgeDetector = SkImageFilters::MatrixConvolution( |
| kernelSize, kernel, 1.f, 0.f, kernelOffset, SkTileMode::kClamp, false, nullptr); |
| // This uses the high contrast filter because it resembles a pre-processing step you may perform |
| // prior to edge detection. The specifics of the high contrast algorithm don't matter for the GM |
| auto edgeAmplify = SkHighContrastFilter::Make( |
| {false, SkHighContrastConfig::InvertStyle::kNoInvert, 0.5f}); |
| |
| SkPaint testCFPaint; |
| testCFPaint.setColorFilter(edgeAmplify); |
| testCFPaint.setImageFilter(edgeDetector); |
| |
| // The expected result is color filter then image filter, so represent this explicitly in the |
| // image filter graph. |
| SkPaint expectedCFPaint; |
| expectedCFPaint.setImageFilter(SkImageFilters::Compose(edgeDetector, |
| SkImageFilters::ColorFilter(edgeAmplify, nullptr))); |
| |
| // Draw the image twice (expected on the left, test on the right that should match) |
| SkRect crop = SkRect::Make(image->bounds()); |
| canvas->save(); |
| canvas->clipRect(crop); |
| canvas->drawImage(image, 0, 0, SkSamplingOptions(), &expectedCFPaint); // Filter applied by draw's SkPaint |
| canvas->restore(); |
| |
| canvas->save(); |
| canvas->translate(image->width(), 0); |
| canvas->clipRect(crop); |
| canvas->drawImage(image, 0, 0, SkSamplingOptions(), &testCFPaint); |
| canvas->restore(); |
| |
| // Now test mask filters. These should be run before the image filter, and thus have the same |
| // effect as multiplying by an alpha mask. |
| |
| // This mask filter pokes a hole in the center of the image |
| static constexpr SkColor kAlphas[] = { SK_ColorBLACK, SK_ColorTRANSPARENT }; |
| static constexpr SkScalar kPos[] = { 0.4f, 0.9f }; |
| sk_sp<SkShader> alphaMaskShader = SkGradientShader::MakeRadial( |
| {128.f, 128.f}, 128.f, kAlphas, kPos, 2, SkTileMode::kClamp); |
| sk_sp<SkMaskFilter> maskFilter = SkShaderMaskFilter::Make(alphaMaskShader); |
| |
| // If edge detector sees the mask filter, it'll have alpha and then blend with the original |
| // image; otherwise the mask filter will apply late (incorrectly) and none of the original |
| // image will be visible. |
| sk_sp<SkImageFilter> edgeBlend = SkImageFilters::Blend(SkBlendMode::kSrcOver, |
| SkImageFilters::Image(image), edgeDetector); |
| |
| SkPaint testMaskPaint; |
| testMaskPaint.setMaskFilter(maskFilter); |
| testMaskPaint.setImageFilter(edgeBlend); |
| |
| SkPaint expectedMaskPaint; |
| expectedMaskPaint.setImageFilter(SkImageFilters::Compose(edgeBlend, |
| SkImageFilters::Blend(SkBlendMode::kSrcIn, |
| SkImageFilters::Shader(alphaMaskShader)))); |
| |
| canvas->save(); |
| canvas->translate(0, image->height()); |
| canvas->clipRect(crop); |
| canvas->drawImage(image, 0, 0, SkSamplingOptions(), &expectedMaskPaint); |
| canvas->restore(); |
| |
| canvas->save(); |
| canvas->translate(image->width(), image->height()); |
| canvas->clipRect(crop); |
| canvas->drawImage(image, 0, 0, SkSamplingOptions(), &testMaskPaint); |
| canvas->restore(); |
| } |