| /* |
| * 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 <algorithm> |
| #include "SkGradientShader.h" |
| #include "SkSurface.h" |
| #include "sk_tool_utils.h" |
| |
| // Makes a set of m x n tiled images to be drawn with SkCanvas::experimental_drawImageSetV1(). |
| static void make_image_tiles(int tileW, int tileH, int m, int n, const SkColor colors[4], |
| SkCanvas::ImageSetEntry set[]) { |
| const int w = tileW * m; |
| const int h = tileH * n; |
| auto surf = SkSurface::MakeRaster( |
| SkImageInfo::Make(w, h, kRGBA_8888_SkColorType, kPremul_SkAlphaType)); |
| surf->getCanvas()->clear(SK_ColorLTGRAY); |
| |
| static constexpr SkScalar kStripeW = 10; |
| static constexpr SkScalar kStripeSpacing = 30; |
| SkPaint paint; |
| |
| SkPoint pts1[] = {{0.f, 0.f}, {(SkScalar)w, (SkScalar)h}}; |
| auto grad = SkGradientShader::MakeLinear(pts1, colors, nullptr, 2, SkShader::kClamp_TileMode); |
| paint.setShader(std::move(grad)); |
| paint.setAntiAlias(true); |
| paint.setStyle(SkPaint::kStroke_Style); |
| paint.setStrokeWidth(kStripeW); |
| SkPoint stripePts[] = {{-w - kStripeW, -kStripeW}, {kStripeW, h + kStripeW}}; |
| while (stripePts[0].fX <= w) { |
| surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint); |
| stripePts[0].fX += kStripeSpacing; |
| stripePts[1].fX += kStripeSpacing; |
| } |
| |
| SkPoint pts2[] = {{0.f, (SkScalar)h}, {(SkScalar)w, 0.f}}; |
| grad = SkGradientShader::MakeLinear(pts2, colors + 2, nullptr, 2, SkShader::kClamp_TileMode); |
| paint.setShader(std::move(grad)); |
| paint.setBlendMode(SkBlendMode::kMultiply); |
| stripePts[0] = {-w - kStripeW, h + kStripeW}; |
| stripePts[1] = {kStripeW, -kStripeW}; |
| while (stripePts[0].fX <= w) { |
| surf->getCanvas()->drawPoints(SkCanvas::kLines_PointMode, 2, stripePts, paint); |
| stripePts[0].fX += kStripeSpacing; |
| stripePts[1].fX += kStripeSpacing; |
| } |
| auto fullImage = surf->makeImageSnapshot(); |
| for (int y = 0; y < n; ++y) { |
| for (int x = 0; x < m; ++x) { |
| // Images will have 1 pixel of overlap at interior seams for filtering continuity. |
| SkIRect subset = SkIRect::MakeXYWH(x * tileW - 1, y * tileH - 1, tileW + 2, tileH + 2); |
| set[y * m + x].fAAFlags = SkCanvas::kNone_QuadAAFlags; |
| if (x == 0) { |
| subset.fLeft = 0; |
| set[y * m + x].fAAFlags |= SkCanvas::kLeft_QuadAAFlag; |
| } |
| if (x == m - 1) { |
| subset.fRight = w; |
| set[y * m + x].fAAFlags |= SkCanvas::kRight_QuadAAFlag; |
| } |
| if (y == 0) { |
| subset.fTop = 0; |
| set[y * m + x].fAAFlags |= SkCanvas::kTop_QuadAAFlag; |
| } |
| if (y == n - 1) { |
| subset.fBottom = h; |
| set[y * m + x].fAAFlags |= SkCanvas::kBottom_QuadAAFlag; |
| } |
| set[y * m + x].fImage = fullImage->makeSubset(subset); |
| set[y * m + x].fSrcRect = |
| SkRect::MakeXYWH(x == 0 ? 0 : 1, y == 0 ? 0 : 1, tileW, tileH); |
| set[y * m + x].fDstRect = SkRect::MakeXYWH(x * tileW, y * tileH, tileW, tileH); |
| set[y * m + x].fAlpha = 1.f; |
| SkASSERT(set[y * m + x].fImage); |
| } |
| } |
| } |
| |
| 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 SkColor kColors[] = {SK_ColorCYAN, SK_ColorBLACK, |
| SK_ColorMAGENTA, SK_ColorBLACK}; |
| make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet); |
| } |
| |
| 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); |
| 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_DrawImageSetV1(fSet, kM * kN, fm, SkBlendMode::kSrcOver); |
| canvas->restore(); |
| } |
| // A more exotic case with an unusual blend mode, mixed aa flags set, and alpha, |
| // 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 = fSet[0].fImage; |
| entry.fAlpha = 0.7f; |
| entry.fAAFlags = SkCanvas::kLeft_QuadAAFlag | SkCanvas::kTop_QuadAAFlag; |
| canvas->save(); |
| canvas->rotate(3.f); |
| canvas->experimental_DrawImageSetV1(&entry, 1, fm, SkBlendMode::kExclusion); |
| canvas->restore(); |
| canvas->translate(2 * d, 0); |
| } |
| } |
| static constexpr int kM = 4; |
| static constexpr int kN = 3; |
| static constexpr SkScalar kTileW = 30; |
| static constexpr SkScalar kTileH = 60; |
| SkCanvas::ImageSetEntry fSet[kM * kN]; |
| }; |
| |
| // This GM exercises rect-stays-rect type matrices to test that filtering and antialiasing are not |
| // incorrectly disabled. |
| class DrawImageSetRectToRectGM : public GM { |
| private: |
| SkString onShortName() final { return SkString("draw_image_set_rect_to_rect"); } |
| SkISize onISize() override { return SkISize::Make(1250, 850); } |
| void onOnceBeforeDraw() override { |
| static constexpr SkColor kColors[] = {SK_ColorBLUE, SK_ColorWHITE, |
| SK_ColorRED, SK_ColorWHITE}; |
| make_image_tiles(kTileW, kTileH, kM, kN, kColors, fSet); |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| sk_tool_utils::draw_checkerboard(canvas, SK_ColorBLACK, SK_ColorWHITE, 50); |
| static constexpr SkScalar kW = kM * kTileW; |
| static constexpr SkScalar kH = kN * kTileH; |
| SkMatrix matrices[5]; |
| // Identity |
| matrices[0].reset(); |
| // 90 degree rotation |
| matrices[1].setRotate(90, kW / 2.f, kH / 2.f); |
| // Scaling |
| matrices[2].setScale(2.f, 0.5f); |
| // Mirror in x and y |
| matrices[3].setScale(-1.f, -1.f); |
| matrices[3].postTranslate(kW, kH); |
| // Mirror in y, rotate, and scale. |
| matrices[4].setScale(1.f, -1.f); |
| matrices[4].postTranslate(0, kH); |
| matrices[4].postRotate(90, kW / 2.f, kH / 2.f); |
| matrices[4].postScale(2.f, 0.5f); |
| |
| static constexpr SkScalar kTranslate = SkTMax(kW, kH) * 2.f + 10.f; |
| canvas->translate(5.f, 5.f); |
| canvas->save(); |
| for (SkScalar frac : {0.f, 0.5f}) { |
| canvas->save(); |
| canvas->translate(frac, frac); |
| for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) { |
| canvas->save(); |
| canvas->concat(matrices[m]); |
| canvas->experimental_DrawImageSetV1(fSet, kM * kN, kLow_SkFilterQuality, |
| SkBlendMode::kSrcOver); |
| canvas->restore(); |
| canvas->translate(kTranslate, 0); |
| } |
| canvas->restore(); |
| canvas->restore(); |
| canvas->translate(0, kTranslate); |
| canvas->save(); |
| } |
| for (SkVector scale : {SkVector{2.f, 0.5f}, SkVector{0.5, 2.f}}) { |
| SkCanvas::ImageSetEntry scaledSet[kM * kN]; |
| std::copy_n(fSet, kM * kN, scaledSet); |
| for (int i = 0; i < kM * kN; ++i) { |
| scaledSet[i].fDstRect.fLeft *= scale.fX; |
| scaledSet[i].fDstRect.fTop *= scale.fY; |
| scaledSet[i].fDstRect.fRight *= scale.fX; |
| scaledSet[i].fDstRect.fBottom *= scale.fY; |
| scaledSet[i].fAlpha = 0 == (i % 3) ? 0.4f : 1.f; |
| } |
| for (size_t m = 0; m < SK_ARRAY_COUNT(matrices); ++m) { |
| canvas->save(); |
| canvas->concat(matrices[m]); |
| canvas->experimental_DrawImageSetV1(scaledSet, kM * kN, kLow_SkFilterQuality, |
| SkBlendMode::kSrcOver); |
| canvas->restore(); |
| canvas->translate(kTranslate, 0); |
| } |
| canvas->restore(); |
| canvas->translate(0, kTranslate); |
| canvas->save(); |
| } |
| } |
| static constexpr int kM = 2; |
| static constexpr int kN = 2; |
| static constexpr int kTileW = 40; |
| static constexpr int kTileH = 50; |
| SkCanvas::ImageSetEntry fSet[kM * kN]; |
| }; |
| |
| DEF_GM(return new DrawImageSetGM();) |
| DEF_GM(return new DrawImageSetRectToRectGM();) |
| |
| } // namespace skiagm |