aboutsummaryrefslogtreecommitdiffhomepage
path: root/gm/drawatlascolor.cpp
blob: 333148253884eff316ff65144d8f66b62175764c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/*
 * Copyright 2015 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 "SkCanvas.h"
#include "SkRSXform.h"
#include "SkSurface.h"

// Create a square atlas of:
//   opaque white  |     opaque red
//  ------------------------------------
//   opaque green  |  transparent black
//
static sk_sp<SkImage> make_atlas(SkCanvas* caller, int atlasSize) {
    const int kBlockSize = atlasSize/2;

    SkImageInfo info = SkImageInfo::MakeN32Premul(atlasSize, atlasSize);
    auto surface(caller->makeSurface(info));
    if (nullptr == surface) {
        surface = SkSurface::MakeRaster(info);
    }
    SkCanvas* canvas = surface->getCanvas();

    SkPaint paint;
    paint.setXfermode(SkXfermode::Make(SkXfermode::kSrc_Mode));

    paint.setColor(SK_ColorWHITE);
    SkRect r = SkRect::MakeXYWH(0, 0,
                                SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
    canvas->drawRect(r, paint);

    paint.setColor(SK_ColorRED);
    r = SkRect::MakeXYWH(SkIntToScalar(kBlockSize), 0,
                         SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
    canvas->drawRect(r, paint);

    paint.setColor(SK_ColorGREEN);
    r = SkRect::MakeXYWH(0, SkIntToScalar(kBlockSize),
                         SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
    canvas->drawRect(r, paint);

    paint.setColor(SK_ColorTRANSPARENT);
    r = SkRect::MakeXYWH(SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize),
                         SkIntToScalar(kBlockSize), SkIntToScalar(kBlockSize));
    canvas->drawRect(r, paint);

    return surface->makeImageSnapshot();
}

// This GM tests the drawAtlas API with colors, different xfer modes
// and transparency in the atlas image
class DrawAtlasColorsGM : public skiagm::GM {
public:
    DrawAtlasColorsGM() {
        this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
    }

protected:
    SkString onShortName() override {
        return SkString("draw-atlas-colors");
    }

    SkISize onISize() override {
        return SkISize::Make(kNumXferModes * (kAtlasSize + kPad) + kPad,
                             2 * kNumColors * (kAtlasSize + kPad) + kTextPad + kPad);
    }

    void onDraw(SkCanvas* canvas) override {
        const SkRect target = SkRect::MakeWH(SkIntToScalar(kAtlasSize), SkIntToScalar(kAtlasSize));

        if (nullptr == fAtlas) {
            fAtlas = make_atlas(canvas, kAtlasSize);
        }

        const struct {
            SkXfermode::Mode fMode;
            const char*      fLabel;
        } gModes[] = {
            { SkXfermode::kClear_Mode,      "Clear"     },
            { SkXfermode::kSrc_Mode,        "Src"       },
            { SkXfermode::kDst_Mode,        "Dst"       },
            { SkXfermode::kSrcOver_Mode,    "SrcOver"   },
            { SkXfermode::kDstOver_Mode,    "DstOver"   },
            { SkXfermode::kSrcIn_Mode,      "SrcIn"     },
            { SkXfermode::kDstIn_Mode,      "DstIn"     },
            { SkXfermode::kSrcOut_Mode,     "SrcOut"    },
            { SkXfermode::kDstOut_Mode,     "DstOut"    },
            { SkXfermode::kSrcATop_Mode,    "SrcATop"   },
            { SkXfermode::kDstATop_Mode,    "DstATop"   },
            { SkXfermode::kXor_Mode,        "Xor"       },
            { SkXfermode::kPlus_Mode,       "Plus"      },
            { SkXfermode::kModulate_Mode,   "Mod"       },
            { SkXfermode::kScreen_Mode,     "Screen"    },
            { SkXfermode::kOverlay_Mode,    "Overlay"   },
            { SkXfermode::kDarken_Mode,     "Darken"    },
            { SkXfermode::kLighten_Mode,    "Lighten"   },
            { SkXfermode::kColorDodge_Mode, "Dodge"     },
            { SkXfermode::kColorBurn_Mode,  "Burn"      },
            { SkXfermode::kHardLight_Mode,  "Hard"      },
            { SkXfermode::kSoftLight_Mode,  "Soft"      },
            { SkXfermode::kDifference_Mode, "Diff"      },
            { SkXfermode::kExclusion_Mode,  "Exclusion" },
            { SkXfermode::kMultiply_Mode,   "Multiply"  },
            { SkXfermode::kHue_Mode,        "Hue"       },
            { SkXfermode::kSaturation_Mode, "Sat"       },
            { SkXfermode::kColor_Mode,      "Color"     },
            { SkXfermode::kLuminosity_Mode, "Luminosity"},
        };

        SkColor gColors[] = {
            SK_ColorWHITE,
            SK_ColorRED,
            0x88888888,         // transparent grey
            0x88000088          // transparent blue
        };

        const int numModes = SK_ARRAY_COUNT(gModes);
        SkASSERT(numModes == kNumXferModes);
        const int numColors = SK_ARRAY_COUNT(gColors);
        SkASSERT(numColors == kNumColors);
        SkRSXform xforms[numColors];
        SkRect rects[numColors];
        SkColor quadColors[numColors];

        SkPaint paint;
        paint.setAntiAlias(true);

        for (int i = 0; i < numColors; ++i) {
            xforms[i].set(1.0f, 0.0f, SkIntToScalar(kPad), i*(target.width()+kPad));
            rects[i] = target;
            quadColors[i] = gColors[i];
        }

        SkPaint textP;
        textP.setTextSize(SkIntToScalar(kTextPad));
        textP.setAntiAlias(true);
        sk_tool_utils::set_portable_typeface(&textP, nullptr);

        for (int i = 0; i < numModes; ++i) {
            canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
                             i*(target.width()+kPad)+kPad, SkIntToScalar(kTextPad),
                             textP);
        }

        for (int i = 0; i < numModes; ++i) {
            canvas->save();
            canvas->translate(SkIntToScalar(i*(target.height()+kPad)),
                              SkIntToScalar(kTextPad+kPad));
            // w/o a paint
            canvas->drawAtlas(fAtlas.get(), xforms, rects, quadColors, numColors,
                              gModes[i].fMode, nullptr, nullptr);
            canvas->translate(0.0f, numColors*(target.height()+kPad));
            // w a paint
            canvas->drawAtlas(fAtlas.get(), xforms, rects, quadColors, numColors,
                              gModes[i].fMode, nullptr, &paint);
            canvas->restore();
        }
    }

private:
    static const int kNumXferModes = 29;
    static const int kNumColors = 4;
    static const int kAtlasSize = 30;
    static const int kPad = 2;
    static const int kTextPad = 8;


    sk_sp<SkImage> fAtlas;

    typedef GM INHERITED;
};
DEF_GM( return new DrawAtlasColorsGM; )