aboutsummaryrefslogtreecommitdiffhomepage
path: root/gm/shadertext2.cpp
blob: e760e548d5bc65ba6bb49017ba51cf161ddc58fa (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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/*
 * Copyright 2011 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 "SkGradientShader.h"
#include "SkUnitMappers.h"

namespace skiagm {

static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
    bm->setConfig(config, w, h);
    bm->allocPixels();
    bm->eraseColor(SK_ColorTRANSPARENT);

    SkCanvas    canvas(*bm);
    SkScalar    s = SkIntToScalar(SkMin32(w, h));
    static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
    static const SkPoint     kPts1[] = { { s, 0 }, { 0, s } };
    static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
    static const SkColor kColors0[] = {0x40FF00FF, 0xF0FFFF00, 0x4000FFFF };
    static const SkColor kColors1[] = {0xF0FF00FF, 0x80FFFF00, 0xF000FFFF };


    SkPaint     paint;

    SkUnitMapper*   um = NULL;

    um = new SkCosineMapper;

    SkAutoUnref au(um);

    paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
    canvas.drawPaint(paint);
    paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
                    SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
    canvas.drawPaint(paint);
}

///////////////////////////////////////////////////////////////////////////////

struct LabeledMatrix {
    SkMatrix    fMatrix;
    const char* fLabel;
};

class ShaderText2GM : public GM {
public:
    ShaderText2GM() {
        this->setBGColor(0xFFDDDDDD);
    }

protected:

    SkString onShortName() {
        return SkString("shadertext2");
    }

    SkISize onISize() { return make_isize(1800, 900); }

    virtual void onDraw(SkCanvas* canvas) {
        static const char kText[] = "SKIA";
        static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
        static const int kPointSize = 55;

        SkTDArray<LabeledMatrix> matrices;
        matrices.append()->fMatrix.reset();
        matrices.top().fLabel = "Identity";
        matrices.append()->fMatrix.setScale(1.2f, 0.8f);
        matrices.top().fLabel = "Scale";
        matrices.append()->fMatrix.setRotate(10.f);
        matrices.top().fLabel = "Rotate";
        matrices.append()->fMatrix.reset();
        matrices.top().fMatrix.setPerspX(-0.0015f);
        matrices.top().fMatrix.setPerspY(+0.0015f);
        matrices.top().fLabel = "Persp";

        SkTDArray<LabeledMatrix> localMatrices;
        localMatrices.append()->fMatrix.reset();
        localMatrices.top().fLabel = "Identity";
        localMatrices.append()->fMatrix.setScale(2.5f, 0.2f);
        localMatrices.top().fLabel = "Scale";
        localMatrices.append()->fMatrix.setRotate(45.f);
        localMatrices.top().fLabel = "Rotate";
        localMatrices.append()->fMatrix.reset();
        localMatrices.top().fMatrix.setPerspX(-0.007f);
        localMatrices.top().fMatrix.setPerspY(+0.008f);
        localMatrices.top().fLabel = "Persp";

        static SkBitmap bmp;
        if (bmp.isNull()) {
            makebm(&bmp, SkBitmap::kARGB_8888_Config, kPointSize / 2, kPointSize / 2);
        }

        SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(bmp,
                                                                   SkShader::kMirror_TileMode,
                                                                   SkShader::kRepeat_TileMode));
        SkPaint fillPaint;
        fillPaint.setAntiAlias(true);
        fillPaint.setTextSize(SkIntToScalar(kPointSize));
        fillPaint.setFilterBitmap(true);
        fillPaint.setShader(shader);

        SkPaint outlinePaint;
        outlinePaint.setAntiAlias(true);
        outlinePaint.setTextSize(SkIntToScalar(kPointSize));
        outlinePaint.setStyle(SkPaint::kStroke_Style);
        outlinePaint.setStrokeWidth(0.f);

        SkScalar w = fillPaint.measureText(kText, kTextLen);
        static SkScalar kPadY = 0.5f * kPointSize;
        static SkScalar kPadX = 1.5f * kPointSize;

        SkPaint strokePaint(fillPaint);
        strokePaint.setStyle(SkPaint::kStroke_Style);
        strokePaint.setStrokeWidth(kPointSize * 0.1f);

        SkPaint labelPaint;
        labelPaint.setColor(0xff000000);
        labelPaint.setAntiAlias(true);
        labelPaint.setTextSize(12.f);

        canvas->translate(15.f, 15.f);
        canvas->drawBitmap(bmp, 0, 0);
        canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);

        static const char kLabelLabel[] = "localM / canvasM";
        canvas->drawText(kLabelLabel, strlen(kLabelLabel), 0, 0, labelPaint);
        canvas->translate(0, 15.f);

        canvas->save();
        SkScalar maxLabelW = 0;
        canvas->translate(0, kPadY / 2 + kPointSize);
        for (int lm = 0; lm < localMatrices.count(); ++lm) {
            canvas->drawText(matrices[lm].fLabel, strlen(matrices[lm].fLabel),
                             0, labelPaint.getTextSize() - 1, labelPaint);
            SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
                                                     strlen(matrices[lm].fLabel));
            maxLabelW = SkMaxScalar(maxLabelW, labelW);
            canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
        }
        canvas->restore();

        canvas->translate(maxLabelW + kPadX / 2.f, 0.f);

        for (int s = 0; s < 2; ++s) {
            SkPaint& paint = s ? strokePaint : fillPaint;

            SkScalar columnH;
            for (int m = 0; m < matrices.count(); ++m) {
                columnH = 0;
                canvas->save();
                canvas->drawText(matrices[m].fLabel, strlen(matrices[m].fLabel),
                                 0, labelPaint.getTextSize() - 1, labelPaint);
                canvas->translate(0, kPadY / 2 + kPointSize);
                columnH += kPadY / 2 + kPointSize;
                for (int lm = 0; lm < localMatrices.count(); ++lm) {
                    shader->setLocalMatrix(localMatrices[lm].fMatrix);

                    canvas->save();
                        canvas->concat(matrices[m].fMatrix);
                        canvas->drawText(kText, kTextLen, 0, 0, paint);
                        canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
                    canvas->restore();

                    SkPath path;
                    path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
                                                1.2f * w, 2.f * kPointSize),
                                                225.f, 359.f,
                                                false);
                    path.close();

                    canvas->translate(0.f, kPointSize + kPadY);
                    columnH += kPointSize + kPadY;

                    canvas->save();
                        canvas->concat(matrices[m].fMatrix);
                        canvas->drawTextOnPath(kText, kTextLen, path, NULL, paint);
                        canvas->drawTextOnPath(kText, kTextLen, path, NULL, outlinePaint);
                    canvas->restore();
                    SkPaint stroke;
                    stroke.setStyle(SkPaint::kStroke_Style);
                    canvas->translate(0.f, kPointSize + kPadY);
                    columnH += kPointSize + kPadY;
                }
                canvas->restore();
                canvas->translate(w + kPadX, 0.f);
            }
            if (0 == s) {
                canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
                canvas->translate(kPadX / 2, 0.f);
                static const char kFillLabel[] = "Filled";
                static const char kStrokeLabel[] = "Stroked";
                SkScalar y = columnH + kPadY / 2;
                SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
                SkScalar strokeX = kPadX;
                canvas->drawText(kFillLabel, strlen(kFillLabel), fillX, y, labelPaint);
                canvas->drawText(kStrokeLabel, strlen(kStrokeLabel), strokeX, y, labelPaint);
            }
        }
    }

    virtual uint32_t onGetFlags() const SK_OVERRIDE {
        // disable 565 for now, til mike fixes the debug assert
        return this->INHERITED::onGetFlags() | kSkip565_Flag;
    }

private:
    typedef GM INHERITED;
};

///////////////////////////////////////////////////////////////////////////////

#ifndef SK_BUILD_FOR_ANDROID
static GM* MyFactory(void*) { return new ShaderText2GM; }
static GMRegistry reg(MyFactory);
#endif
}