| /* |
| * 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 "GrClip.h" |
| #include "GrContext.h" |
| #include "GrRenderTargetContext.h" |
| #include "SkGradientShader.h" |
| #include "SkImage_Base.h" |
| #include "SkSurface.h" |
| |
| namespace skiagm { |
| |
| class AAFlagsGM : public GM { |
| private: |
| SkString onShortName() final { return SkString("aaflags"); } |
| SkISize onISize() override { return SkISize::Make(1000, 1450); } |
| 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 { |
| GrContext* ctx = canvas->getGrContext(); |
| if (!ctx) { |
| DrawGpuOnlyMessage(canvas); |
| return; |
| } |
| GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext(); |
| SkASSERT(rtc); |
| |
| 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}}; |
| matrices[1].setPolyToPoly(src, dst, 4); |
| matrices[1].postTranslate(d, 50.f); |
| // skew |
| matrices[2].setRotate(-60.f); |
| matrices[2].postSkew(0.5f, -1.35f); |
| matrices[2].postScale(0.6f, 1.05f); |
| matrices[2].postTranslate(d, 2.5f * d); |
| // perspective + mirror in x. |
| dst[1] = {0, 0}; |
| dst[0] = {3.f / 4.f * kM * kTileW, 0}; |
| dst[3] = {2.f / 3.f * kM * kTileW, 1 / 4.f * kN * kTileH}; |
| dst[2] = {1.f / 3.f * kM * kTileW, 1 / 4.f * kN * kTileH - 25.f}; |
| matrices[3].setPolyToPoly(src, dst, 4); |
| matrices[3].postTranslate(100.f, d); |
| for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) { |
| // Draw grid of green "lines" at interior tile boundaries. |
| static constexpr SkScalar kLineOutset = 10.f; |
| static constexpr SkScalar kLineHalfW = 4.f; |
| auto color = GrColor4f(0.f, 1.f, 0.f, 1.f); |
| for (int x = 1; x < kM; ++x) { |
| GrPaint paint; |
| paint.setColor4f(color); |
| SkRect lineRect = |
| SkRect::MakeLTRB(x * kTileW - kLineHalfW, -kLineOutset, |
| x * kTileW + kLineHalfW, kN * kTileH + kLineOutset); |
| rtc->drawRect(GrNoClip(), std::move(paint), GrAA::kYes, matrices[m], lineRect); |
| } |
| for (int y = 1; y < kN; ++y) { |
| GrPaint paint; |
| paint.setColor4f(color); |
| SkRect lineRect = |
| SkRect::MakeLTRB(-kLineOutset, y * kTileH - kLineHalfW, |
| kTileW * kM + kLineOutset, y * kTileH + kLineHalfW); |
| rtc->drawRect(GrNoClip(), std::move(paint), GrAA::kYes, matrices[m], lineRect); |
| } |
| static constexpr GrColor kColor = GrColor_WHITE; |
| for (int x = 0; x < kM; ++x) { |
| for (int y = 0; y < kN; ++y) { |
| auto proxy = as_IB(fImage[x][y]) |
| ->asTextureProxyRef(ctx, GrSamplerState::ClampBilerp(), |
| nullptr, nullptr, nullptr); |
| if (!proxy) { |
| continue; |
| } |
| auto srcR = proxy->getBoundsRect(); |
| auto dstR = SkRect::MakeXYWH(x * kTileW, y * kTileH, kTileW, kTileH); |
| GrQuadAAFlags aaFlags = GrQuadAAFlags::kNone; |
| if (x == 0) { |
| aaFlags |= GrQuadAAFlags::kLeft; |
| } |
| if (x == kM - 1) { |
| aaFlags |= GrQuadAAFlags::kRight; |
| } |
| if (y == 0) { |
| aaFlags |= GrQuadAAFlags::kTop; |
| } |
| if (y == kN - 1) { |
| aaFlags |= GrQuadAAFlags::kBottom; |
| } |
| rtc->drawTexture(GrNoClip(), proxy, GrSamplerState::Filter::kBilerp, kColor, |
| srcR, dstR, aaFlags, SkCanvas::kFast_SrcRectConstraint, |
| matrices[m], nullptr, nullptr); |
| } |
| } |
| } |
| } |
| static constexpr int kM = 4; |
| static constexpr int kN = 4; |
| static constexpr SkScalar kTileW = 100; |
| static constexpr SkScalar kTileH = 100; |
| sk_sp<SkImage> fImage[kM][kN]; |
| }; |
| |
| DEF_GM(return new AAFlagsGM();) |
| |
| } // namespace skiagm |