| /* |
| * 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/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTypes.h" |
| #include "include/private/SkTArray.h" |
| |
| class ImageScaleAlignedGM : public skiagm::GM { |
| protected: |
| void onOnceBeforeDraw() override { |
| const SkVector vectors[] = { { 1, 0 }, { 0, 1 } }; |
| |
| for (size_t i = 0; i < std::size(vectors); ++i) { |
| auto& set = fSets.push_back(); |
| |
| set.fVector = vectors[i]; |
| set.fImages.push_back() = MakeImage(vectors[i], SK_ColorGREEN); |
| set.fScales.push_back() = 1; |
| set.fImages.push_back() = MakeImage(vectors[i], SK_ColorRED); |
| set.fScales.push_back() = kStretchFactor; |
| set.fImages.push_back() = MakeImage(vectors[i], SK_ColorGREEN); |
| set.fScales.push_back() = 1; |
| } |
| } |
| |
| SkString onShortName() override { |
| return SkString("image_scale_aligned"); |
| } |
| |
| SkISize onISize() override { |
| return SkISize::Make(580, 780); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| struct { |
| SkPoint offset; |
| SkVector scale; |
| } cfgs[] = { |
| {{ 10, 10 }, { 1, 1 }}, |
| {{ 300.5f, 10 }, { 1, 1 }}, |
| {{ 10, 200.5f }, { 1, 1 }}, |
| {{ 300.5f, 200.5f }, { 1, 1 }}, |
| |
| {{ 10.5f, 400.5f }, { 1, 1 }}, |
| {{ 550.5f, 400.5f }, { -1, 1 }}, |
| {{ 10.5f, 750.5f }, { 1, -1 }}, |
| {{ 550.5f, 750.5f }, { -1, -1 }}, |
| }; |
| |
| for (size_t i = 0; i < std::size(cfgs); ++i) { |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->translate(cfgs[i].offset.x(), cfgs[i].offset.y()); |
| canvas->scale(cfgs[i].scale.x(), cfgs[i].scale.y()); |
| drawSets(canvas); |
| } |
| } |
| |
| private: |
| struct ImageSet { |
| SkSTArray<3, sk_sp<SkImage>, true> fImages; |
| SkSTArray<3, SkScalar> fScales; |
| SkVector fVector; |
| }; |
| |
| static sk_sp<SkImage> MakeImage(const SkVector& vec, SkColor color) { |
| const SkPoint start = SkPoint::Make(vec.y() * kSegLen / 2, vec.x() * kSegLen / 2); |
| const SkPoint end = SkPoint::Make(start.x() + vec.x() * (kSegLen - 1), |
| start.y() + vec.y() * (kSegLen - 1)); |
| |
| auto surface(SkSurface::MakeRasterN32Premul(kSegLen, kSegLen)); |
| surface->getCanvas()->clear(SK_ColorTRANSPARENT); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| const SkRect border = SkRect::MakeIWH(kSegLen, kSegLen).makeInset(.5f, .5f); |
| paint.setColor(SK_ColorBLUE); |
| paint.setStyle(SkPaint::kStroke_Style); |
| surface->getCanvas()->drawRect(border, paint); |
| |
| paint.setColor(SK_ColorBLACK); |
| surface->getCanvas()->drawLine(start, end, paint); |
| |
| paint.reset(); |
| paint.setColor(color); |
| const SkPoint pts[] = { start, end }; |
| surface->getCanvas()->drawPoints(SkCanvas::kPoints_PointMode, 2, pts, paint); |
| |
| return surface->makeImageSnapshot(); |
| } |
| |
| void drawSets(SkCanvas* canvas) const { |
| SkAutoCanvasRestore acr(canvas, true); |
| |
| const SkSamplingOptions samplings[] = { |
| SkSamplingOptions(SkFilterMode::kNearest), |
| SkSamplingOptions(SkFilterMode::kLinear), |
| SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear), |
| SkSamplingOptions(SkCubicResampler::Mitchell()), |
| }; |
| const bool AAs[] = { false, true }; |
| |
| SkPaint paint; |
| for (int i = 0; i < fSets.count(); ++i) { |
| auto& set = fSets[i]; |
| SkPoint lastPt; |
| for (size_t j = 0; j < std::size(AAs); ++j) { |
| paint.setAntiAlias(AAs[j]); |
| for (size_t k = 0; k < std::size(samplings); ++k) { |
| lastPt = drawSet(canvas, set, samplings[k], paint); |
| canvas->translate((kSegLen + 4) * set.fVector.y(), |
| (kSegLen + 4) * set.fVector.x()); |
| } |
| } |
| canvas->translate(lastPt.x() + kSegLen, |
| - SkIntToScalar(kSegLen + 4) * std::size(samplings) * std::size(AAs)); |
| } |
| } |
| |
| SkPoint drawSet(SkCanvas* canvas, const ImageSet& set, const SkSamplingOptions& sampling, |
| const SkPaint& paint) const { |
| SkASSERT(set.fImages.count() == set.fScales.count()); |
| |
| SkPoint pt = SkPoint::Make(0, 0); |
| for (int i = 0; i < set.fImages.count(); ++i) { |
| auto& img = set.fImages[i]; |
| const SkRect dst = |
| SkRect::MakeXYWH(pt.x(), pt.y(), |
| img->width() * (1 + (set.fScales[i] - 1) * set.fVector.x()), |
| img->height() * (1 + (set.fScales[i] - 1) * set.fVector.y())); |
| |
| canvas->drawImageRect(img.get(), dst, sampling, &paint); |
| pt.offset(dst.width() * set.fVector.x(), dst.height() * set.fVector.y()); |
| } |
| |
| return pt; |
| } |
| |
| inline static constexpr unsigned kSegLen = 15; |
| inline static constexpr unsigned kStretchFactor = 4; |
| SkSTArray<2, ImageSet> fSets; |
| |
| using INHERITED = GM; |
| }; |
| |
| DEF_GM(return new ImageScaleAlignedGM();) |