| /* |
| * Copyright 2021 Google LLC |
| * |
| * 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/SkImageFilter.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathEffect.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkSurface.h" |
| #include "include/effects/SkDashPathEffect.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/effects/SkImageFilters.h" |
| |
| #include "tools/Resources.h" |
| #include "tools/ToolUtils.h" |
| |
| // TODO(michaelludwig) - This will be made public within SkImageFilters.h at some point |
| #include "src/effects/imagefilters/SkCropImageFilter.h" |
| |
| |
| namespace { |
| |
| static constexpr SkColor kOutputBoundsColor = SK_ColorRED; |
| static constexpr SkColor kCropRectColor = SK_ColorGREEN; |
| static constexpr SkColor kContentBoundsColor = SK_ColorBLUE; |
| |
| static constexpr SkRect kExampleBounds = {0.f, 0.f, 100.f, 100.f}; |
| |
| // "Crop" refers to the rect passed to the crop image filter, "Rect" refers to some other rect |
| // from context, likely the output bounds or the content bounds. |
| enum class CropRelation { |
| kCropOverlapsRect, // Intersect but doesn't fully contain one way or the other |
| kCropContainsRect, |
| kRectContainsCrop, |
| kCropRectDisjoint, |
| }; |
| |
| SkRect make_overlap(const SkRect& r, float amountX, float amountY) { |
| return r.makeOffset(r.width() * amountX, r.height() * amountY); |
| } |
| |
| SkRect make_inset(const SkRect& r, float amountX, float amountY) { |
| return r.makeInset(r.width() * amountX, r.height() * amountY); |
| } |
| |
| SkRect make_outset(const SkRect& r, float amountX, float amountY) { |
| return r.makeOutset(r.width() * amountX, r.height() * amountY); |
| } |
| |
| SkRect make_disjoint(const SkRect& r, float amountX, float amountY) { |
| float xOffset = (amountX > 0.f ? (r.width() + r.width() * amountX) : |
| (amountX < 0.f ? (-r.width() + r.width() * amountX) : 0.f)); |
| float yOffset = (amountY > 0.f ? (r.height() + r.height() * amountY) : |
| (amountY < 0.f ? (-r.height() + r.height() * amountY) : 0.f)); |
| return r.makeOffset(xOffset, yOffset); |
| } |
| |
| void get_example_rects(CropRelation outputRelation, CropRelation inputRelation, bool hintContent, |
| SkRect* outputBounds, SkRect* cropRect, SkRect* contentBounds) { |
| *outputBounds = kExampleBounds.makeInset(20.f, 20.f); |
| switch(outputRelation) { |
| case CropRelation::kCropOverlapsRect: |
| *cropRect = make_overlap(*outputBounds, -0.15f, 0.15f); |
| SkASSERT(cropRect->intersects(*outputBounds) && |
| !cropRect->contains(*outputBounds) && |
| !outputBounds->contains(*cropRect)); |
| break; |
| case CropRelation::kCropContainsRect: |
| *cropRect = make_outset(*outputBounds, 0.15f, 0.15f); |
| SkASSERT(cropRect->contains(*outputBounds)); |
| break; |
| case CropRelation::kRectContainsCrop: |
| *cropRect = make_inset(*outputBounds, 0.15f, 0.15f); |
| SkASSERT(outputBounds->contains(*cropRect)); |
| break; |
| case CropRelation::kCropRectDisjoint: |
| *cropRect = make_disjoint(*outputBounds, 0.15f, 0.0f); |
| SkASSERT(!cropRect->intersects(*outputBounds)); |
| break; |
| } |
| |
| SkAssertResult(cropRect->intersect(kExampleBounds)); |
| |
| // Determine content bounds for example based on computed crop rect and input relation |
| if (hintContent) { |
| switch(inputRelation) { |
| case CropRelation::kCropOverlapsRect: |
| *contentBounds = make_overlap(*cropRect, 0.075f, -0.75f); |
| SkASSERT(contentBounds->intersects(*cropRect) && |
| !contentBounds->contains(*cropRect) && |
| !cropRect->contains(*contentBounds)); |
| break; |
| case CropRelation::kCropContainsRect: |
| *contentBounds = make_inset(*cropRect, 0.075f, 0.075f); |
| SkASSERT(cropRect->contains(*contentBounds)); |
| break; |
| case CropRelation::kRectContainsCrop: |
| *contentBounds = make_outset(*cropRect, 0.1f, 0.1f); |
| SkASSERT(contentBounds->contains(*cropRect)); |
| break; |
| case CropRelation::kCropRectDisjoint: |
| *contentBounds = make_disjoint(*cropRect, 0.0f, 0.075f); |
| SkASSERT(!contentBounds->intersects(*cropRect)); |
| break; |
| } |
| |
| SkAssertResult(contentBounds->intersect(kExampleBounds)); |
| } else { |
| *contentBounds = kExampleBounds; |
| } |
| } |
| |
| // TODO(michaelludwig) - This is a useful test pattern for tile modes and filtering; should |
| // consolidate it with the similar version in gpu_blur_utils if the GMs remain separate at the end. |
| sk_sp<SkImage> make_image(SkCanvas* canvas, const SkRect* contentBounds) { |
| const float w = kExampleBounds.width(); |
| const float h = kExampleBounds.height(); |
| |
| const auto srcII = SkImageInfo::Make(SkISize::Make(SkScalarCeilToInt(w), SkScalarCeilToInt(h)), |
| kN32_SkColorType, kPremul_SkAlphaType); |
| auto surf = SkSurfaces::Raster(srcII); |
| |
| surf->getCanvas()->drawColor(SK_ColorDKGRAY); |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| // Draw four horizontal lines at 1/4, 3/8, 5/8, 3/4. |
| paint.setStrokeWidth(h/16.f); |
| paint.setColor(SK_ColorRED); |
| surf->getCanvas()->drawLine({0.f, 1.f*h/4.f}, {w, 1.f*h/4.f}, paint); |
| paint.setColor(/* sea foam */ 0xFF71EEB8); |
| surf->getCanvas()->drawLine({0.f, 3.f*h/8.f}, {w, 3.f*h/8.f}, paint); |
| paint.setColor(SK_ColorYELLOW); |
| surf->getCanvas()->drawLine({0.f, 5.f*h/8.f}, {w, 5.f*h/8.f}, paint); |
| paint.setColor(SK_ColorCYAN); |
| surf->getCanvas()->drawLine({0.f, 3.f*h/4.f}, {w, 3.f*h/4.f}, paint); |
| |
| // Draw four vertical lines at 1/4, 3/8, 5/8, 3/4. |
| paint.setStrokeWidth(w/16.f); |
| paint.setColor(/* orange */ 0xFFFFA500); |
| surf->getCanvas()->drawLine({1.f*w/4.f, 0.f}, {1.f*h/4.f, h}, paint); |
| paint.setColor(SK_ColorBLUE); |
| surf->getCanvas()->drawLine({3.f*w/8.f, 0.f}, {3.f*h/8.f, h}, paint); |
| paint.setColor(SK_ColorMAGENTA); |
| surf->getCanvas()->drawLine({5.f*w/8.f, 0.f}, {5.f*h/8.f, h}, paint); |
| paint.setColor(SK_ColorGREEN); |
| surf->getCanvas()->drawLine({3.f*w/4.f, 0.f}, {3.f*h/4.f, h}, paint); |
| |
| // Fill everything outside of the content bounds with red since it shouldn't be sampled from. |
| if (contentBounds) { |
| SkRect buffer = contentBounds->makeOutset(1.f, 1.f); |
| surf->getCanvas()->clipRect(buffer, SkClipOp::kDifference); |
| surf->getCanvas()->clear(SK_ColorRED); |
| } |
| |
| return surf->makeImageSnapshot(); |
| } |
| |
| // Subset 'image' to contentBounds, apply 'contentTile' mode to fill 'cropRect'-sized image. |
| sk_sp<SkImage> make_cropped_image(sk_sp<SkImage> image, |
| const SkRect& contentBounds, |
| SkTileMode contentTile, |
| const SkRect& cropRect) { |
| auto surface = SkSurfaces::Raster( |
| image->imageInfo().makeWH(SkScalarCeilToInt(cropRect.width()), |
| SkScalarCeilToInt(cropRect.height()))); |
| auto content = image->makeSubset(nullptr, |
| contentTile == SkTileMode::kDecal ? contentBounds.roundOut() |
| : contentBounds.roundIn()); |
| if (!content || !surface) { |
| return nullptr; |
| } |
| SkPaint tiledContent; |
| tiledContent.setShader(content->makeShader(contentTile, contentTile, |
| SkFilterMode::kNearest, |
| SkMatrix::Translate(contentBounds.left(), |
| contentBounds.top()))); |
| surface->getCanvas()->translate(-cropRect.left(), -cropRect.top()); |
| surface->getCanvas()->drawPaint(tiledContent); |
| return surface->makeImageSnapshot(); |
| } |
| |
| void draw_example_tile( |
| SkCanvas* canvas, |
| SkTileMode inputMode, // the tile mode applied to content bounds |
| CropRelation inputRelation, // how crop rect relates to content bounds |
| bool hintContent, // whether or not contentBounds is hinted to saveLayer() |
| SkTileMode outputMode, // the tile mode applied to the crop rect output |
| CropRelation outputRelation) {// how crop rect relates to output bounds (clip pre-saveLayer) |
| |
| // Determine crop rect for example based on output relation |
| SkRect outputBounds, cropRect, contentBounds; |
| get_example_rects(outputRelation, inputRelation, hintContent, |
| &outputBounds, &cropRect, &contentBounds); |
| SkASSERT(kExampleBounds.contains(outputBounds) && |
| kExampleBounds.contains(cropRect) && |
| kExampleBounds.contains(contentBounds)); |
| |
| auto image = make_image(canvas, hintContent ? &contentBounds : nullptr); |
| |
| canvas->save(); |
| // Visualize the image tiled on the content bounds (blue border) and then tiled on the crop |
| // rect (green) border, semi-transparent |
| { |
| auto cropImage = ToolUtils::MakeTextureImage( |
| canvas, make_cropped_image(image, contentBounds, inputMode, cropRect)); |
| if (cropImage) { |
| SkPaint tiledPaint; |
| tiledPaint.setShader(cropImage->makeShader(outputMode, outputMode, |
| SkFilterMode::kNearest, |
| SkMatrix::Translate(cropRect.left(), |
| cropRect.top()))); |
| tiledPaint.setAlphaf(0.25f); |
| |
| canvas->save(); |
| canvas->clipRect(kExampleBounds); |
| canvas->drawPaint(tiledPaint); |
| canvas->restore(); |
| } |
| } |
| |
| // Build filter, clip, save layer, draw, restore - the interesting part is in the tile modes |
| // and how the various bounds intersect each other. |
| { |
| sk_sp<SkImageFilter> filter = SkMakeCropImageFilter(contentBounds, inputMode, nullptr); |
| filter = SkImageFilters::Blur(4.f, 4.f, std::move(filter)); |
| filter = SkMakeCropImageFilter(cropRect, outputMode, std::move(filter)); |
| SkPaint layerPaint; |
| layerPaint.setImageFilter(std::move(filter)); |
| |
| canvas->save(); |
| canvas->clipRect(outputBounds); |
| canvas->saveLayer(hintContent ? &contentBounds : nullptr, &layerPaint); |
| |
| auto tmp = ToolUtils::MakeTextureImage(canvas, image); |
| canvas->drawImageRect(tmp, contentBounds, contentBounds, |
| SkSamplingOptions(SkFilterMode::kNearest), nullptr, |
| SkCanvas::kStrict_SrcRectConstraint); |
| canvas->restore(); |
| canvas->restore(); |
| } |
| |
| // Visualize bounds after the actual rendering. |
| { |
| SkPaint border; |
| border.setStyle(SkPaint::kStroke_Style); |
| |
| border.setColor(kOutputBoundsColor); |
| canvas->drawRect(outputBounds, border); |
| |
| border.setColor(kCropRectColor); |
| canvas->drawRect(cropRect, border); |
| |
| if (hintContent) { |
| border.setColor(kContentBoundsColor); |
| canvas->drawRect(contentBounds, border); |
| } |
| } |
| |
| canvas->restore(); |
| } |
| |
| // Draw 5 example tiles in a column for 5 relationships between content bounds and crop rect: |
| // no content hint, intersect, content contains crop, crop contains content, and no intersection |
| void draw_example_column( |
| SkCanvas* canvas, |
| SkTileMode inputMode, |
| SkTileMode outputMode, |
| CropRelation outputRelation) { |
| const std::pair<CropRelation, bool> inputRelations[5] = { |
| { CropRelation::kCropOverlapsRect, false }, |
| { CropRelation::kCropOverlapsRect, true }, |
| { CropRelation::kCropContainsRect, true }, |
| { CropRelation::kRectContainsCrop, true }, |
| { CropRelation::kCropRectDisjoint, true } |
| }; |
| |
| canvas->save(); |
| for (auto [inputRelation, hintContent] : inputRelations) { |
| draw_example_tile(canvas, inputMode, inputRelation, hintContent, |
| outputMode, outputRelation); |
| canvas->translate(0.f, kExampleBounds.fBottom + 1.f); |
| } |
| |
| canvas->restore(); |
| } |
| |
| // Draw 5x4 grid of examples covering supported input tile modes and crop rect relations |
| static constexpr int kNumRows = 5; |
| static constexpr int kNumCols = 4; |
| static constexpr float kGridWidth = kNumCols * (kExampleBounds.fRight+1.f) - 1.f; |
| static constexpr float kGridHeight = kNumRows * (kExampleBounds.fBottom+1.f) - 1.f; |
| |
| void draw_example_grid( |
| SkCanvas* canvas, |
| SkTileMode inputMode, |
| SkTileMode outputMode) { |
| canvas->save(); |
| for (auto outputRelation : { CropRelation::kCropOverlapsRect, |
| CropRelation::kCropContainsRect, |
| CropRelation::kRectContainsCrop, |
| CropRelation::kCropRectDisjoint }) { |
| draw_example_column(canvas, inputMode, outputMode, outputRelation); |
| canvas->translate(kExampleBounds.fRight + 1.f, 0.f); |
| } |
| canvas->restore(); |
| |
| // Draw dashed lines between rows and columns |
| SkPaint dashedLine; |
| dashedLine.setColor(SK_ColorGRAY); |
| dashedLine.setStyle(SkPaint::kStroke_Style); |
| dashedLine.setStrokeCap(SkPaint::kSquare_Cap); |
| static const float kDashes[2] = {5.f, 15.f}; |
| dashedLine.setPathEffect(SkDashPathEffect::Make(kDashes, 2, 0.f)); |
| |
| for (int y = 1; y < kNumRows; ++y) { |
| canvas->drawLine({0.5f, y * (kExampleBounds.fBottom+1.f) - 0.5f}, |
| {kGridWidth - 0.5f, y * (kExampleBounds.fBottom+1.f) - 0.5f}, |
| dashedLine); |
| } |
| for (int x = 1; x < kNumCols; ++x) { |
| canvas->drawLine({x * (kExampleBounds.fRight+1.f) - 0.5f, 0.5f}, |
| {x * (kExampleBounds.fRight+1.f) - 0.5f, kGridHeight - 0.5f}, |
| dashedLine); |
| } |
| } |
| |
| } // namespace |
| |
| namespace skiagm { |
| |
| class CropImageFilterGM : public GM { |
| public: |
| CropImageFilterGM(SkTileMode inputMode, SkTileMode outputMode) |
| : fInputMode(inputMode) |
| , fOutputMode(outputMode) {} |
| |
| protected: |
| SkISize getISize() override { |
| return {SkScalarRoundToInt(4.f * (kExampleBounds.fRight + 1.f) - 1.f), |
| SkScalarRoundToInt(5.f * (kExampleBounds.fBottom + 1.f) - 1.f)}; |
| } |
| SkString getName() const override { |
| SkString name("crop_imagefilter_"); |
| switch(fInputMode) { |
| case SkTileMode::kDecal: name.append("decal"); break; |
| case SkTileMode::kClamp: name.append("clamp"); break; |
| case SkTileMode::kRepeat: name.append("repeat"); break; |
| case SkTileMode::kMirror: name.append("mirror"); break; |
| } |
| name.append("-in_"); |
| |
| switch (fOutputMode) { |
| case SkTileMode::kDecal: name.append("decal"); break; |
| case SkTileMode::kClamp: name.append("clamp"); break; |
| case SkTileMode::kRepeat: name.append("repeat"); break; |
| case SkTileMode::kMirror: name.append("mirror"); break; |
| } |
| name.append("-out"); |
| return name; |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| draw_example_grid(canvas, fInputMode, fOutputMode); |
| } |
| |
| private: |
| SkTileMode fInputMode; |
| SkTileMode fOutputMode; |
| }; |
| |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kDecal, SkTileMode::kDecal); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kDecal, SkTileMode::kClamp); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kDecal, SkTileMode::kRepeat); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kDecal, SkTileMode::kMirror); ) |
| |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kClamp, SkTileMode::kDecal); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kClamp, SkTileMode::kClamp); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kClamp, SkTileMode::kRepeat); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kClamp, SkTileMode::kMirror); ) |
| |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kRepeat, SkTileMode::kDecal); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kRepeat, SkTileMode::kClamp); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kRepeat, SkTileMode::kRepeat); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kRepeat, SkTileMode::kMirror); ) |
| |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kMirror, SkTileMode::kDecal); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kMirror, SkTileMode::kClamp); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kMirror, SkTileMode::kRepeat); ) |
| DEF_GM( return new CropImageFilterGM(SkTileMode::kMirror, SkTileMode::kMirror); ) |
| |
| } // namespace skiagm |
