Michael Ludwig | 6985853 | 2018-11-28 15:34:34 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "gm.h" |
| 9 | |
| 10 | #include "GrClip.h" |
| 11 | #include "GrContext.h" |
| 12 | #include "GrRenderTargetContext.h" |
| 13 | #include "GrSurfaceContextPriv.h" |
| 14 | #include "SkGr.h" |
| 15 | #include "SkGradientShader.h" |
| 16 | |
| 17 | static constexpr SkScalar kTileWidth = 40; |
| 18 | static constexpr SkScalar kTileHeight = 30; |
| 19 | |
| 20 | static constexpr int kRowCount = 4; |
| 21 | static constexpr int kColCount = 3; |
| 22 | |
| 23 | static void draw_text(SkCanvas* canvas, const char* text) { |
Hal Canary | 6ac0df8 | 2019-01-07 16:01:22 -0500 | [diff] [blame^] | 24 | canvas->drawString(text, 0, 0, SkFont(nullptr, 12), SkPaint()); |
Michael Ludwig | 6985853 | 2018-11-28 15:34:34 -0500 | [diff] [blame] | 25 | } |
| 26 | |
| 27 | static void draw_gradient_tiles(GrRenderTargetContext* rtc, const SkMatrix& view, |
| 28 | bool adjustLocal) { |
| 29 | GrRenderTargetContext::QuadSetEntry quads[kRowCount * kColCount]; |
| 30 | |
| 31 | for (int i = 0; i < kRowCount; ++i) { |
| 32 | for (int j = 0; j < kColCount; ++j) { |
| 33 | SkRect tile = SkRect::MakeXYWH(j * kTileWidth, i * kTileHeight, kTileWidth, kTileHeight); |
| 34 | |
| 35 | int q = i * kColCount + j; |
| 36 | quads[q].fRect = tile; |
| 37 | quads[q].fColor = {1.f, 1.f, 1.f, 1.f}; |
| 38 | |
| 39 | if (adjustLocal) { |
| 40 | quads[q].fLocalMatrix.setTranslate(-tile.fLeft, -tile.fTop); |
| 41 | } else { |
| 42 | quads[q].fLocalMatrix.setIdentity(); |
| 43 | } |
| 44 | |
| 45 | quads[q].fAAFlags = GrQuadAAFlags::kNone; |
| 46 | if (i == 0) { |
| 47 | quads[q].fAAFlags |= GrQuadAAFlags::kTop; |
| 48 | } |
| 49 | if (i == kRowCount - 1) { |
| 50 | quads[q].fAAFlags |= GrQuadAAFlags::kBottom; |
| 51 | } |
| 52 | if (j == 0) { |
| 53 | quads[q].fAAFlags |= GrQuadAAFlags::kLeft; |
| 54 | } |
| 55 | if (j == kColCount - 1) { |
| 56 | quads[q].fAAFlags |= GrQuadAAFlags::kRight; |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | // Make a shared gradient paint |
| 62 | static constexpr SkPoint pts[] = { {0.f, 0.f}, {0.25f * kTileWidth, 0.25f * kTileHeight} }; |
| 63 | static constexpr SkColor colors[] = { SK_ColorBLUE, SK_ColorWHITE }; |
| 64 | |
| 65 | auto gradient = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kMirror_TileMode); |
| 66 | SkPaint paint; |
| 67 | paint.setShader(gradient); |
| 68 | GrPaint grPaint; |
| 69 | SkPaintToGrPaint(rtc->surfPriv().getContext(), rtc->colorSpaceInfo(), paint, view, &grPaint); |
| 70 | // And use private API to use GrFillRectOp |
| 71 | rtc->drawQuadSet(GrNoClip(), std::move(grPaint), GrAA::kYes, view, quads, SK_ARRAY_COUNT(quads)); |
| 72 | } |
| 73 | |
| 74 | static void draw_color_tiles(GrRenderTargetContext* rtc, const SkMatrix& view, bool multicolor) { |
| 75 | GrRenderTargetContext::QuadSetEntry quads[kRowCount * kColCount]; |
| 76 | |
| 77 | for (int i = 0; i < kRowCount; ++i) { |
| 78 | for (int j = 0; j < kColCount; ++j) { |
| 79 | SkRect tile = SkRect::MakeXYWH(j * kTileWidth, i * kTileHeight, kTileWidth, kTileHeight); |
| 80 | |
| 81 | int q = i * kColCount + j; |
| 82 | quads[q].fRect = tile; |
| 83 | quads[q].fLocalMatrix.setIdentity(); |
| 84 | |
| 85 | if (multicolor) { |
| 86 | quads[q].fColor = {(i + 1.f) / kRowCount, (j + 1.f) / kColCount, .4f, 1.f}; |
| 87 | } else { |
| 88 | quads[q].fColor = {.2f, .8f, .3f, 1.f}; |
| 89 | } |
| 90 | |
| 91 | quads[q].fAAFlags = GrQuadAAFlags::kNone; |
| 92 | if (i == 0) { |
| 93 | quads[q].fAAFlags |= GrQuadAAFlags::kTop; |
| 94 | } |
| 95 | if (i == kRowCount - 1) { |
| 96 | quads[q].fAAFlags |= GrQuadAAFlags::kBottom; |
| 97 | } |
| 98 | if (j == 0) { |
| 99 | quads[q].fAAFlags |= GrQuadAAFlags::kLeft; |
| 100 | } |
| 101 | if (j == kColCount - 1) { |
| 102 | quads[q].fAAFlags |= GrQuadAAFlags::kRight; |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | GrPaint grPaint; |
| 108 | // And use private API to use GrFillRectOp |
| 109 | rtc->drawQuadSet(GrNoClip(), std::move(grPaint), GrAA::kYes, view, quads, SK_ARRAY_COUNT(quads)); |
| 110 | } |
| 111 | |
| 112 | static void draw_tile_boundaries(SkCanvas* canvas, const SkMatrix& local) { |
| 113 | // Draw grid of red lines at interior tile boundaries. |
| 114 | static constexpr SkScalar kLineOutset = 10.f; |
| 115 | SkPaint paint; |
| 116 | paint.setAntiAlias(true); |
| 117 | paint.setColor(SK_ColorRED); |
| 118 | paint.setStyle(SkPaint::kStroke_Style); |
| 119 | paint.setStrokeWidth(0.f); |
| 120 | for (int x = 1; x < kColCount; ++x) { |
| 121 | SkPoint pts[] = {{x * kTileWidth, 0}, {x * kTileWidth, kRowCount * kTileHeight}}; |
| 122 | local.mapPoints(pts, 2); |
| 123 | SkVector v = pts[1] - pts[0]; |
| 124 | v.setLength(v.length() + kLineOutset); |
| 125 | canvas->drawLine(pts[1] - v, pts[0] + v, paint); |
| 126 | } |
| 127 | for (int y = 1; y < kRowCount; ++y) { |
| 128 | SkPoint pts[] = {{0, y * kTileHeight}, {kTileWidth * kColCount, y * kTileHeight}}; |
| 129 | local.mapPoints(pts, 2); |
| 130 | SkVector v = pts[1] - pts[0]; |
| 131 | v.setLength(v.length() + kLineOutset); |
| 132 | canvas->drawLine(pts[1] - v, pts[0] + v, paint); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | // Tile renderers (column variation) |
| 137 | typedef void (*TileRenderer)(GrRenderTargetContext*, const SkMatrix&); |
| 138 | static TileRenderer kTileSets[] = { |
| 139 | [](GrRenderTargetContext* rtc, const SkMatrix& view) { draw_gradient_tiles(rtc, view, true); }, |
| 140 | [](GrRenderTargetContext* rtc, const SkMatrix& view) { draw_gradient_tiles(rtc, view, false); }, |
| 141 | [](GrRenderTargetContext* rtc, const SkMatrix& view) { draw_color_tiles(rtc, view, false); }, |
| 142 | [](GrRenderTargetContext* rtc, const SkMatrix& view) { draw_color_tiles(rtc, view, true); }, |
| 143 | }; |
| 144 | static const char* kTileSetNames[] = { "Local", "Aligned", "Green", "Multicolor" }; |
| 145 | static_assert(SK_ARRAY_COUNT(kTileSets) == SK_ARRAY_COUNT(kTileSetNames), "Count mismatch"); |
| 146 | |
| 147 | namespace skiagm { |
| 148 | |
| 149 | class DrawQuadSetGM : public GM { |
| 150 | private: |
| 151 | SkString onShortName() final { return SkString("draw_quad_set"); } |
| 152 | SkISize onISize() override { return SkISize::Make(800, 800); } |
| 153 | |
| 154 | void onDraw(SkCanvas* canvas) override { |
| 155 | GrContext* ctx = canvas->getGrContext(); |
| 156 | if (!ctx) { |
| 157 | DrawGpuOnlyMessage(canvas); |
| 158 | return; |
| 159 | } |
| 160 | GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext(); |
| 161 | SkASSERT(rtc); |
| 162 | |
| 163 | SkMatrix rowMatrices[5]; |
| 164 | // Identity |
| 165 | rowMatrices[0].setIdentity(); |
| 166 | // Translate/scale |
| 167 | rowMatrices[1].setTranslate(5.5f, 20.25f); |
| 168 | rowMatrices[1].postScale(.9f, .7f); |
| 169 | // Rotation |
| 170 | rowMatrices[2].setRotate(20.0f); |
| 171 | rowMatrices[2].preTranslate(15.f, -20.f); |
| 172 | // Skew |
| 173 | rowMatrices[3].setSkew(.5f, .25f); |
| 174 | rowMatrices[3].preTranslate(-30.f, 0.f); |
| 175 | // Perspective |
| 176 | SkPoint src[4]; |
| 177 | SkRect::MakeWH(kColCount * kTileWidth, kRowCount * kTileHeight).toQuad(src); |
| 178 | SkPoint dst[4] = {{0, 0}, |
| 179 | {kColCount * kTileWidth + 10.f, 15.f}, |
| 180 | {kColCount * kTileWidth - 28.f, kRowCount * kTileHeight + 40.f}, |
| 181 | {25.f, kRowCount * kTileHeight - 15.f}}; |
| 182 | SkAssertResult(rowMatrices[4].setPolyToPoly(src, dst, 4)); |
| 183 | rowMatrices[4].preTranslate(0.f, +10.f); |
| 184 | static const char* matrixNames[] = { "Identity", "T+S", "Rotate", "Skew", "Perspective" }; |
| 185 | static_assert(SK_ARRAY_COUNT(matrixNames) == SK_ARRAY_COUNT(rowMatrices), "Count mismatch"); |
| 186 | |
| 187 | // Print a column header |
| 188 | canvas->save(); |
| 189 | canvas->translate(110.f, 20.f); |
| 190 | for (size_t j = 0; j < SK_ARRAY_COUNT(kTileSetNames); ++j) { |
| 191 | draw_text(canvas, kTileSetNames[j]); |
| 192 | canvas->translate(kColCount * kTileWidth + 30.f, 0.f); |
| 193 | } |
| 194 | canvas->restore(); |
| 195 | canvas->translate(0.f, 40.f); |
| 196 | |
| 197 | // Render all tile variations |
| 198 | for (size_t i = 0; i < SK_ARRAY_COUNT(rowMatrices); ++i) { |
| 199 | canvas->save(); |
| 200 | canvas->translate(10.f, 0.5f * kRowCount * kTileHeight); |
| 201 | draw_text(canvas, matrixNames[i]); |
| 202 | |
| 203 | canvas->translate(100.f, -0.5f * kRowCount * kTileHeight); |
| 204 | for (size_t j = 0; j < SK_ARRAY_COUNT(kTileSets); ++j) { |
| 205 | canvas->save(); |
| 206 | draw_tile_boundaries(canvas, rowMatrices[i]); |
| 207 | |
| 208 | canvas->concat(rowMatrices[i]); |
| 209 | kTileSets[j](rtc, canvas->getTotalMatrix()); |
| 210 | // Undo the local transformation |
| 211 | canvas->restore(); |
| 212 | // And advance to the next column |
| 213 | canvas->translate(kColCount * kTileWidth + 30.f, 0.f); |
| 214 | } |
| 215 | // Reset back to the left edge |
| 216 | canvas->restore(); |
| 217 | // And advance to the next row |
| 218 | canvas->translate(0.f, kRowCount * kTileHeight + 20.f); |
| 219 | } |
| 220 | } |
| 221 | }; |
| 222 | |
| 223 | DEF_GM(return new DrawQuadSetGM();) |
| 224 | |
| 225 | } // namespace skiagm |