1
2/*
3 * Copyright 2014 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9#include "gm.h"
10#include "SkPatchGrid.h"
11
12static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) {
13    //draw control points
14    SkPaint paint;
15    SkPoint bottom[4];
16    SkPatchUtils::getBottomCubic(cubics, bottom);
17    SkPoint top[4];
18    SkPatchUtils::getTopCubic(cubics, top);
19    SkPoint left[4];
20    SkPatchUtils::getLeftCubic(cubics, left);
21    SkPoint right[4];
22    SkPatchUtils::getRightCubic(cubics, right);
23
24    paint.setColor(SK_ColorBLACK);
25    paint.setStrokeWidth(0.5);
26    SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] };
27    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint);
28    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom+1, paint);
29    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint);
30    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint);
31    canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint);
32
33    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top+1, paint);
34    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left+1, paint);
35    canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right+1, paint);
36
37    paint.setStrokeWidth(2);
38
39    paint.setColor(SK_ColorRED);
40    canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint);
41
42    paint.setColor(SK_ColorBLUE);
43    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom+1, paint);
44
45    paint.setColor(SK_ColorCYAN);
46    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top+1, paint);
47
48    paint.setColor(SK_ColorYELLOW);
49    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left+1, paint);
50
51    paint.setColor(SK_ColorGREEN);
52    canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right+1, paint);
53}
54
55namespace skiagm {
56/**
57 * This GM draws a grid of patches, it only uses colors so it could be considered a mesh gradient.
58 */
59class SkPatchGridGM : public GM {
60
61public:
62    SkPatchGridGM() {
63        this->setBGColor(0xFFFFFFFF);
64    }
65
66protected:
67    virtual SkString onShortName() SK_OVERRIDE {
68        return SkString("patch_grid");
69    }
70
71    virtual SkISize onISize() SK_OVERRIDE {
72        return SkISize::Make(800, 800);
73    }
74
75    virtual uint32_t onGetFlags() const SK_OVERRIDE {
76        return kSkipTiled_Flag;
77    }
78
79    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
80
81        SkPaint paint;
82
83        SkPoint vertices[4][5] = {
84            {{50,50}, {150,50}, {250,50},{350,50},{450,50}},
85            {{50,150}, {120,120}, {250,150},{350,150},{450,150}},
86            {{50,250}, {150,250}, {250,250},{350,250},{450,250}},
87            {{100,300}, {150,350}, {250,350},{350,350},{450,350}}
88        };
89
90        SkColor cornerColors[4][5] = {
91            {SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
92            {SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
93            {SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE},
94            {SK_ColorRED, SK_ColorBLUE, SK_ColorRED, SK_ColorBLUE, SK_ColorRED},
95        };
96
97        SkPoint hrzCtrl[4][8] = {
98            {{75,30},{125,45},{175,70},{225,20},{275,50},{325,50},{375,5},{425,90}},
99            {{75,150},{125,150},{175,150},{225,150},{275,150},{325,150},{375,150},{425,150}},
100            {{75,250},{125,250},{175,250},{225,250},{275,200},{325,150},{375,250},{425,250}},
101            {{75,350},{125,350},{175,350},{225,350},{275,350},{325,350},{375,350},{425,350}}
102        };
103
104        SkPoint vrtCtrl[6][5] = {
105            {{50,75},{150,75},{250,75},{350,75},{450,75}},
106            {{50,125},{150,125},{250,125},{350,125},{450,125}},
107            {{50,175},{150,175},{220,225},{350,175},{470,225}},
108            {{50,225},{150,225},{220,175},{350,225},{470,155}},
109            {{50,275},{150,275},{250,275},{350,275},{400,305}},
110            {{50,325},{150,325},{250,325},{350,325},{450,325}}
111        };
112
113        static const int kRows = 3;
114        static const int kCols = 4;
115
116        canvas->scale(3, 3);
117        SkPatchGrid grid(kRows, kCols, SkPatchGrid::kColors_VertexType, NULL);
118        for (int i = 0; i < kRows; i++) {
119            for (int j = 0; j < kCols; j++) {
120                SkPoint points[12];
121
122                //set corners
123                points[SkPatchUtils::kTopP0_CubicCtrlPts] = vertices[i][j];
124                points[SkPatchUtils::kTopP3_CubicCtrlPts] = vertices[i][j + 1];
125                points[SkPatchUtils::kBottomP0_CubicCtrlPts] = vertices[i + 1][j];
126                points[SkPatchUtils::kBottomP3_CubicCtrlPts] = vertices[i + 1][j + 1];
127
128                points[SkPatchUtils::kTopP1_CubicCtrlPts] = hrzCtrl[i][j * 2];
129                points[SkPatchUtils::kTopP2_CubicCtrlPts] = hrzCtrl[i][j * 2 + 1];
130                points[SkPatchUtils::kBottomP1_CubicCtrlPts] = hrzCtrl[i + 1][j * 2];
131                points[SkPatchUtils::kBottomP2_CubicCtrlPts] = hrzCtrl[i + 1][j * 2 + 1];
132
133                points[SkPatchUtils::kLeftP1_CubicCtrlPts] = vrtCtrl[i * 2][j];
134                points[SkPatchUtils::kLeftP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j];
135                points[SkPatchUtils::kRightP1_CubicCtrlPts] = vrtCtrl[i * 2][j + 1];
136                points[SkPatchUtils::kRightP2_CubicCtrlPts] = vrtCtrl[i * 2 + 1][j + 1];
137
138                SkColor colors[4];
139                colors[0] = cornerColors[i][j];
140                colors[1] = cornerColors[i][j + 1];
141                colors[3] = cornerColors[i + 1][j];
142                colors[2] = cornerColors[i + 1][j + 1];
143
144                grid.setPatch(j, i, points, colors, NULL);
145            }
146        }
147
148        grid.draw(canvas, paint);
149        SkISize dims = grid.getDimensions();
150        for (int y = 0; y < dims.height(); y++) {
151            for (int x = 0; x < dims.width(); x++) {
152                SkPoint cubics[12];
153                grid.getPatch(x, y, cubics, NULL, NULL);
154                draw_control_points(canvas, cubics);
155            }
156        }
157    }
158
159private:
160    typedef GM INHERITED;
161};
162
163DEF_GM(return SkNEW(SkPatchGridGM); )
164
165}
166