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/gm.h"
9 #include "include/core/SkBlendMode.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkFont.h"
13 #include "include/core/SkMatrix.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkPoint.h"
16 #include "include/core/SkRect.h"
17 #include "include/core/SkScalar.h"
18 #include "include/core/SkShader.h"
19 #include "include/core/SkSize.h"
20 #include "include/core/SkString.h"
21 #include "include/core/SkTileMode.h"
22 #include "include/core/SkTypeface.h"
23 #include "include/core/SkTypes.h"
24 #include "include/effects/SkGradientShader.h"
25 #include "include/gpu/GrContext.h"
26 #include "include/private/GrTypesPriv.h"
27 #include "src/gpu/GrClip.h"
28 #include "src/gpu/GrPaint.h"
29 #include "src/gpu/GrRenderTargetContext.h"
30 #include "src/gpu/SkGr.h"
31
32 #include <utility>
33
34 static constexpr SkScalar kTileWidth = 40;
35 static constexpr SkScalar kTileHeight = 30;
36
37 static constexpr int kRowCount = 4;
38 static constexpr int kColCount = 3;
39
draw_text(SkCanvas * canvas,const char * text)40 static void draw_text(SkCanvas* canvas, const char* text) {
41 canvas->drawString(text, 0, 0, SkFont(nullptr, 12), SkPaint());
42 }
43
draw_gradient_tiles(SkCanvas * canvas,bool alignGradients)44 static void draw_gradient_tiles(SkCanvas* canvas, bool alignGradients) {
45 // Always draw the same gradient
46 static constexpr SkPoint pts[] = { {0.f, 0.f}, {0.25f * kTileWidth, 0.25f * kTileHeight} };
47 static constexpr SkColor colors[] = { SK_ColorBLUE, SK_ColorWHITE };
48
49 GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
50
51 GrContext* context = canvas->getGrContext();
52
53 auto gradient = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kMirror);
54 SkPaint paint;
55 paint.setShader(gradient);
56
57 for (int i = 0; i < kRowCount; ++i) {
58 for (int j = 0; j < kColCount; ++j) {
59 SkRect tile = SkRect::MakeWH(kTileWidth, kTileHeight);
60 if (alignGradients) {
61 tile.offset(j * kTileWidth, i * kTileHeight);
62 } else {
63 canvas->save();
64 canvas->translate(j * kTileWidth, i * kTileHeight);
65 }
66
67 unsigned aa = SkCanvas::kNone_QuadAAFlags;
68 if (i == 0) {
69 aa |= SkCanvas::kTop_QuadAAFlag;
70 }
71 if (i == kRowCount - 1) {
72 aa |= SkCanvas::kBottom_QuadAAFlag;
73 }
74 if (j == 0) {
75 aa |= SkCanvas::kLeft_QuadAAFlag;
76 }
77 if (j == kColCount - 1) {
78 aa |= SkCanvas::kRight_QuadAAFlag;
79 }
80
81 if (rtc) {
82 // Use non-public API to leverage general GrPaint capabilities
83 SkMatrix view = canvas->getTotalMatrix();
84 GrPaint grPaint;
85 SkPaintToGrPaint(context, rtc->colorSpaceInfo(), paint, view, &grPaint);
86 rtc->fillRectWithEdgeAA(GrNoClip(), std::move(grPaint), GrAA::kYes,
87 static_cast<GrQuadAAFlags>(aa), view, tile);
88 } else {
89 // Fallback to solid color on raster backend since the public API only has color
90 SkColor color = alignGradients ? SK_ColorBLUE
91 : (i * kColCount + j) % 2 == 0 ? SK_ColorBLUE
92 : SK_ColorWHITE;
93 canvas->experimental_DrawEdgeAAQuad(
94 tile, nullptr, static_cast<SkCanvas::QuadAAFlags>(aa), color,
95 SkBlendMode::kSrcOver);
96 }
97
98 if (!alignGradients) {
99 // Pop off the matrix translation when drawing unaligned
100 canvas->restore();
101 }
102 }
103 }
104 }
105
draw_color_tiles(SkCanvas * canvas,bool multicolor)106 static void draw_color_tiles(SkCanvas* canvas, bool multicolor) {
107 for (int i = 0; i < kRowCount; ++i) {
108 for (int j = 0; j < kColCount; ++j) {
109 SkRect tile = SkRect::MakeXYWH(j * kTileWidth, i * kTileHeight, kTileWidth, kTileHeight);
110
111 SkColor4f color;
112 if (multicolor) {
113 color = {(i + 1.f) / kRowCount, (j + 1.f) / kColCount, .4f, 1.f};
114 } else {
115 color = {.2f, .8f, .3f, 1.f};
116 }
117
118 unsigned aa = SkCanvas::kNone_QuadAAFlags;
119 if (i == 0) {
120 aa |= SkCanvas::kTop_QuadAAFlag;
121 }
122 if (i == kRowCount - 1) {
123 aa |= SkCanvas::kBottom_QuadAAFlag;
124 }
125 if (j == 0) {
126 aa |= SkCanvas::kLeft_QuadAAFlag;
127 }
128 if (j == kColCount - 1) {
129 aa |= SkCanvas::kRight_QuadAAFlag;
130 }
131
132 canvas->experimental_DrawEdgeAAQuad(
133 tile, nullptr, static_cast<SkCanvas::QuadAAFlags>(aa), color.toSkColor(),
134 SkBlendMode::kSrcOver);
135 }
136 }
137 }
138
draw_tile_boundaries(SkCanvas * canvas,const SkMatrix & local)139 static void draw_tile_boundaries(SkCanvas* canvas, const SkMatrix& local) {
140 // Draw grid of red lines at interior tile boundaries.
141 static constexpr SkScalar kLineOutset = 10.f;
142 SkPaint paint;
143 paint.setAntiAlias(true);
144 paint.setColor(SK_ColorRED);
145 paint.setStyle(SkPaint::kStroke_Style);
146 paint.setStrokeWidth(0.f);
147 for (int x = 1; x < kColCount; ++x) {
148 SkPoint pts[] = {{x * kTileWidth, 0}, {x * kTileWidth, kRowCount * kTileHeight}};
149 local.mapPoints(pts, 2);
150 SkVector v = pts[1] - pts[0];
151 v.setLength(v.length() + kLineOutset);
152 canvas->drawLine(pts[1] - v, pts[0] + v, paint);
153 }
154 for (int y = 1; y < kRowCount; ++y) {
155 SkPoint pts[] = {{0, y * kTileHeight}, {kTileWidth * kColCount, y * kTileHeight}};
156 local.mapPoints(pts, 2);
157 SkVector v = pts[1] - pts[0];
158 v.setLength(v.length() + kLineOutset);
159 canvas->drawLine(pts[1] - v, pts[0] + v, paint);
160 }
161 }
162
163 // Tile renderers (column variation)
164 typedef void (*TileRenderer)(SkCanvas*);
165 static TileRenderer kTileSets[] = {
__anon106198490102() 166 [](SkCanvas* canvas) { draw_gradient_tiles(canvas, /* aligned */ false); },
__anon106198490202() 167 [](SkCanvas* canvas) { draw_gradient_tiles(canvas, /* aligned */ true); },
__anon106198490302() 168 [](SkCanvas* canvas) { draw_color_tiles(canvas, /* multicolor */ false); },
__anon106198490402() 169 [](SkCanvas* canvas) { draw_color_tiles(canvas, /* multicolor */true); },
170 };
171 static const char* kTileSetNames[] = { "Local", "Aligned", "Green", "Multicolor" };
172 static_assert(SK_ARRAY_COUNT(kTileSets) == SK_ARRAY_COUNT(kTileSetNames), "Count mismatch");
173
174 namespace skiagm {
175
176 class DrawQuadSetGM : public GM {
177 private:
onShortName()178 SkString onShortName() override { return SkString("draw_quad_set"); }
onISize()179 SkISize onISize() override { return SkISize::Make(800, 800); }
180
onDraw(SkCanvas * canvas)181 void onDraw(SkCanvas* canvas) override {
182 SkMatrix rowMatrices[5];
183 // Identity
184 rowMatrices[0].setIdentity();
185 // Translate/scale
186 rowMatrices[1].setTranslate(5.5f, 20.25f);
187 rowMatrices[1].postScale(.9f, .7f);
188 // Rotation
189 rowMatrices[2].setRotate(20.0f);
190 rowMatrices[2].preTranslate(15.f, -20.f);
191 // Skew
192 rowMatrices[3].setSkew(.5f, .25f);
193 rowMatrices[3].preTranslate(-30.f, 0.f);
194 // Perspective
195 SkPoint src[4];
196 SkRect::MakeWH(kColCount * kTileWidth, kRowCount * kTileHeight).toQuad(src);
197 SkPoint dst[4] = {{0, 0},
198 {kColCount * kTileWidth + 10.f, 15.f},
199 {kColCount * kTileWidth - 28.f, kRowCount * kTileHeight + 40.f},
200 {25.f, kRowCount * kTileHeight - 15.f}};
201 SkAssertResult(rowMatrices[4].setPolyToPoly(src, dst, 4));
202 rowMatrices[4].preTranslate(0.f, +10.f);
203 static const char* matrixNames[] = { "Identity", "T+S", "Rotate", "Skew", "Perspective" };
204 static_assert(SK_ARRAY_COUNT(matrixNames) == SK_ARRAY_COUNT(rowMatrices), "Count mismatch");
205
206 // Print a column header
207 canvas->save();
208 canvas->translate(110.f, 20.f);
209 for (size_t j = 0; j < SK_ARRAY_COUNT(kTileSetNames); ++j) {
210 draw_text(canvas, kTileSetNames[j]);
211 canvas->translate(kColCount * kTileWidth + 30.f, 0.f);
212 }
213 canvas->restore();
214 canvas->translate(0.f, 40.f);
215
216 // Render all tile variations
217 for (size_t i = 0; i < SK_ARRAY_COUNT(rowMatrices); ++i) {
218 canvas->save();
219 canvas->translate(10.f, 0.5f * kRowCount * kTileHeight);
220 draw_text(canvas, matrixNames[i]);
221
222 canvas->translate(100.f, -0.5f * kRowCount * kTileHeight);
223 for (size_t j = 0; j < SK_ARRAY_COUNT(kTileSets); ++j) {
224 canvas->save();
225 draw_tile_boundaries(canvas, rowMatrices[i]);
226
227 canvas->concat(rowMatrices[i]);
228 kTileSets[j](canvas);
229 // Undo the local transformation
230 canvas->restore();
231 // And advance to the next column
232 canvas->translate(kColCount * kTileWidth + 30.f, 0.f);
233 }
234 // Reset back to the left edge
235 canvas->restore();
236 // And advance to the next row
237 canvas->translate(0.f, kRowCount * kTileHeight + 20.f);
238 }
239 }
240 };
241
242 DEF_GM(return new DrawQuadSetGM();)
243
244 } // namespace skiagm
245