| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm.h" |
| |
| #include "SkGradientShader.h" |
| #include "SkSurface.h" |
| |
| namespace skiagm { |
| |
| class DrawImageSetGM : public GM { |
| private: |
| SkString onShortName() final { return SkString("draw_image_set"); } |
| SkISize onISize() override { return SkISize::Make(1000, 725); } |
| void onOnceBeforeDraw() override { |
| static constexpr SkScalar kW = SkIntToScalar(kTileW * kM); |
| static constexpr SkScalar kH = SkIntToScalar(kTileH * kN); |
| |
| auto surf = SkSurface::MakeRaster( |
| SkImageInfo::Make(kW, kH, kRGBA_8888_SkColorType, kPremul_SkAlphaType)); |
| surf->getCanvas()->clear(SK_ColorLTGRAY); |
| |
| static constexpr SkScalar kStripeW = 10; |
| static constexpr SkScalar kStripeSpacing = 30; |
| SkPaint paint; |
| |
| static constexpr SkPoint pts1[] = {{0.f, 0.f}, {kW, kH}}; |
| static constexpr SkColor kColors1[] = {SK_ColorCYAN, SK_ColorBLACK}; |
| auto grad = |
| SkGradientShader::MakeLinear(pts1, kColors1, nullptr, 2, SkShader::kClamp_TileMode); |
| paint.setShader(std::move(grad)); |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeWidth(kStripeW); |
| SkPoint stripePts[] = {{-kW - kStripeW, -kStripeW}, {kStripeW, kH + kStripeW}}; |
| while (stripePts[0].fX <= kW) { |
| surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint); |
| stripePts[0].fX += kStripeSpacing; |
| stripePts[1].fX += kStripeSpacing; |
| } |
| |
| static constexpr SkPoint pts2[] = {{0.f, kH}, {kW, 0.f}}; |
| static constexpr SkColor kColors2[] = {SK_ColorMAGENTA, SK_ColorBLACK}; |
| grad = SkGradientShader::MakeLinear(pts2, kColors2, nullptr, 2, SkShader::kClamp_TileMode); |
| paint.setShader(std::move(grad)); |
| paint.setBlendMode(SkBlendMode::kMultiply); |
| stripePts[0] = {-kW - kStripeW, kH + kStripeW}; |
| stripePts[1] = {kStripeW, -kStripeW}; |
| while (stripePts[0].fX <= kW) { |
| surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint); |
| stripePts[0].fX += kStripeSpacing; |
| stripePts[1].fX += kStripeSpacing; |
| } |
| |
| auto img = surf->makeImageSnapshot(); |
| for (int y = 0; y < kN; ++y) { |
| for (int x = 0; x < kM; ++x) { |
| fImage[x][y] = |
| img->makeSubset(SkIRect::MakeXYWH(x * kTileW, y * kTileH, kTileW, kTileH)); |
| } |
| } |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| SkScalar d = SkVector{kM * kTileW, kN * kTileH}.length(); |
| SkMatrix matrices[4]; |
| // rotation |
| matrices[0].setRotate(30); |
| matrices[0].postTranslate(d / 3, 0); |
| // perespective |
| SkPoint src[4]; |
| SkRect::MakeWH(kM * kTileW, kN * kTileH).toQuad(src); |
| SkPoint dst[4] = {{0, 0}, |
| {kM * kTileW + 10.f, -5.f}, |
| {kM * kTileW - 28.f, kN * kTileH + 40.f}, |
| {45.f, kN * kTileH - 25.f}}; |
| SkAssertResult(matrices[1].setPolyToPoly(src, dst, 4)); |
| matrices[1].postTranslate(d, 50.f); |
| // skew |
| matrices[2].setRotate(-60.f); |
| matrices[2].postSkew(0.5f, -1.15f); |
| matrices[2].postScale(0.6f, 1.05f); |
| matrices[2].postTranslate(d, 2.6f * d); |
| // perspective + mirror in x. |
| dst[1] = {-.25 * kM * kTileW, 0}; |
| dst[0] = {5.f / 4.f * kM * kTileW, 0}; |
| dst[3] = {2.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH}; |
| dst[2] = {1.f / 3.f * kM * kTileW, 1 / 2.f * kN * kTileH - 0.1f * kTileH}; |
| SkAssertResult(matrices[3].setPolyToPoly(src, dst, 4)); |
| matrices[3].postTranslate(100.f, d); |
| SkCanvas::ImageSetEntry set[kM * kN]; |
| for (int x = 0; x < kM; ++x) { |
| for (int y = 0; y < kN; ++y) { |
| set[y * kM + x].fAAFlags = SkCanvas::kNone_QuadAAFlags; |
| if (x == 0) { |
| set[y * kM + x].fAAFlags |= SkCanvas::kLeft_QuadAAFlag; |
| } |
| if (x == kM - 1) { |
| set[y * kM + x].fAAFlags |= SkCanvas::kRight_QuadAAFlag; |
| } |
| if (y == 0) { |
| set[y * kM + x].fAAFlags |= SkCanvas::kTop_QuadAAFlag; |
| } |
| if (y == kN - 1) { |
| set[y * kM + x].fAAFlags |= SkCanvas::kBottom_QuadAAFlag; |
| } |
| set[y * kM + x].fSrcRect = SkRect::MakeWH(kTileW, kTileH); |
| set[y * kM + x].fDstRect = SkRect::MakeXYWH(x * kTileW, y * kTileH, kTileW, kTileH); |
| set[y * kM + x].fImage = fImage[x][y]; |
| } |
| } |
| for (auto fm : {kNone_SkFilterQuality, kLow_SkFilterQuality}) { |
| for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) { |
| // Draw grid of red lines at interior tile boundaries. |
| static constexpr SkScalar kLineOutset = 10.f; |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| paint.setColor(SK_ColorRED); |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeWidth(0.f); |
| for (int x = 1; x < kM; ++x) { |
| SkPoint pts[] = {{x * kTileW, 0}, {x * kTileW, kN * kTileH}}; |
| matrices[m].mapPoints(pts, 2); |
| SkVector v = pts[1] - pts[0]; |
| v.setLength(v.length() + kLineOutset); |
| canvas->drawLine(pts[1] - v, pts[0] + v, paint); |
| } |
| for (int y = 1; y < kN; ++y) { |
| SkPoint pts[] = {{0, y * kTileH}, {kTileW * kM, y * kTileH}}; |
| matrices[m].mapPoints(pts, 2); |
| SkVector v = pts[1] - pts[0]; |
| v.setLength(v.length() + kLineOutset); |
| canvas->drawLine(pts[1] - v, pts[0] + v, paint); |
| } |
| canvas->save(); |
| canvas->concat(matrices[m]); |
| canvas->experimental_DrawImageSetV0(set, kM * kN, 1.f, fm, SkBlendMode::kSrcOver); |
| canvas->restore(); |
| } |
| // A more exotic case with an unusual blend mode, all aa flags set, and alpha, and |
| // subsets the image |
| SkCanvas::ImageSetEntry entry; |
| entry.fSrcRect = SkRect::MakeWH(kTileW, kTileH).makeInset(kTileW / 4.f, kTileH / 4.f); |
| entry.fDstRect = SkRect::MakeWH(2 * kTileW, 2 * kTileH).makeOffset(d / 4, 2 * d); |
| entry.fImage = fImage[0][0]; |
| entry.fAAFlags = SkCanvas::kAll_QuadAAFlags; |
| canvas->save(); |
| canvas->rotate(3.f); |
| canvas->experimental_DrawImageSetV0(&entry, 1, 0.7f, fm, SkBlendMode::kLuminosity); |
| canvas->restore(); |
| canvas->translate(2 * d, 0); |
| } |
| } |
| static constexpr int kM = 4; |
| static constexpr int kN = 4; |
| static constexpr SkScalar kTileW = 50; |
| static constexpr SkScalar kTileH = 50; |
| sk_sp<SkImage> fImage[kM][kN]; |
| }; |
| |
| DEF_GM(return new DrawImageSetGM();) |
| |
| } // namespace skiagm |