shadertext3.cpp revision a54abdccbd9e9b8917f7c7b0af5d9fe39d879a9a 
1/*
2 * Copyright 2011 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#include "gm.h"
8#include "SkCanvas.h"
9#include "SkGradientShader.h"
10#include "SkUnitMappers.h"
11
12namespace skiagm {
13
14static void makebm(SkBitmap* bm, int w, int h) {
15    bm->allocN32Pixels(w, h);
16    bm->eraseColor(SK_ColorTRANSPARENT);
17
18    SkCanvas    canvas(*bm);
19    SkScalar    s = SkIntToScalar(SkMin32(w, h));
20    static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
21    static const SkPoint     kPts1[] = { { s/2, 0 }, { s/2, s } };
22    static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
23    static const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
24    static const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 };
25
26
27    SkPaint     paint;
28
29    SkUnitMapper*   um = NULL;
30
31    um = new SkCosineMapper;
32
33    SkAutoUnref au(um);
34
35    paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
36                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
37    canvas.drawPaint(paint);
38    paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
39                    SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
40    canvas.drawPaint(paint);
41}
42
43///////////////////////////////////////////////////////////////////////////////
44
45struct LabeledMatrix {
46    SkMatrix    fMatrix;
47    const char* fLabel;
48};
49
50static const char kText[] = "B";
51static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
52static const int kPointSize = 300;
53
54class ShaderText3GM : public GM {
55public:
56    ShaderText3GM() {
57        this->setBGColor(0xFFDDDDDD);
58    }
59
60protected:
61
62    virtual SkString onShortName() SK_OVERRIDE {
63        return SkString("shadertext3");
64    }
65
66    virtual SkISize onISize() SK_OVERRIDE{ return make_isize(800, 1000); }
67
68    virtual void onOnceBeforeDraw() SK_OVERRIDE {
69        makebm(&fBmp, kPointSize / 4, kPointSize / 4);
70    }
71
72    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
73
74        SkPaint bmpPaint;
75        bmpPaint.setAntiAlias(true);
76        bmpPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
77        bmpPaint.setAlpha(0x80);
78        canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
79
80        SkPaint outlinePaint;
81        outlinePaint.setAntiAlias(true);
82        outlinePaint.setTextSize(SkIntToScalar(kPointSize));
83        outlinePaint.setStyle(SkPaint::kStroke_Style);
84        outlinePaint.setStrokeWidth(0.f);
85
86        canvas->translate(15.f, 15.f);
87
88        // draw glyphs scaled up
89        canvas->scale(2.f, 2.f);
90
91        static const SkShader::TileMode kTileModes[] = {
92            SkShader::kRepeat_TileMode,
93            SkShader::kMirror_TileMode,
94        };
95
96        // position the baseline of the first run
97        canvas->translate(0.f, 0.75f * kPointSize);
98
99        canvas->save();
100        int i = 0;
101        for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
102            for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
103                SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(fBmp,
104                                                                           kTileModes[tm0],
105                                                                           kTileModes[tm1]));
106                SkMatrix localM;
107                localM.setTranslate(5.f, 5.f);
108                localM.postRotate(20);
109                localM.postScale(1.15f, .85f);
110                shader->setLocalMatrix(localM);
111
112                SkPaint fillPaint;
113                fillPaint.setAntiAlias(true);
114                fillPaint.setTextSize(SkIntToScalar(kPointSize));
115                fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
116                fillPaint.setShader(shader);
117
118                canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
119                canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
120                SkScalar w = fillPaint.measureText(kText, kTextLen);
121                canvas->translate(w + 10.f, 0.f);
122                ++i;
123                if (!(i % 2)) {
124                    canvas->restore();
125                    canvas->translate(0, 0.75f * kPointSize);
126                    canvas->save();
127                }
128            }
129        }
130        canvas->restore();
131    }
132
133private:
134    SkBitmap fBmp;
135    typedef GM INHERITED;
136};
137
138///////////////////////////////////////////////////////////////////////////////
139
140static GM* MyFactory(void*) { return new ShaderText3GM; }
141static GMRegistry reg(MyFactory);
142}
143