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
8#include "gm.h"
9#include "SkCanvas.h"
10#include "SkGradientShader.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    paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
30                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
31    canvas.drawPaint(paint);
32    paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
33                    SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
34    canvas.drawPaint(paint);
35}
36
37///////////////////////////////////////////////////////////////////////////////
38
39struct LabeledMatrix {
40    SkMatrix    fMatrix;
41    const char* fLabel;
42};
43
44static const char kText[] = "B";
45static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
46static const int kPointSize = 300;
47
48class ShaderText3GM : public GM {
49public:
50    ShaderText3GM() {
51        this->setBGColor(0xFFDDDDDD);
52    }
53
54protected:
55    virtual uint32_t onGetFlags() const SK_OVERRIDE {
56        return kSkipTiled_Flag;
57    }
58
59    virtual SkString onShortName() SK_OVERRIDE {
60        return SkString("shadertext3");
61    }
62
63    virtual SkISize onISize() SK_OVERRIDE{ return SkISize::Make(800, 1000); }
64
65    virtual void onOnceBeforeDraw() SK_OVERRIDE {
66        makebm(&fBmp, kPointSize / 4, kPointSize / 4);
67    }
68
69    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
70
71        SkPaint bmpPaint;
72        bmpPaint.setAntiAlias(true);
73        bmpPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
74        bmpPaint.setAlpha(0x80);
75        canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
76
77        SkPaint outlinePaint;
78        outlinePaint.setAntiAlias(true);
79        outlinePaint.setTextSize(SkIntToScalar(kPointSize));
80        outlinePaint.setStyle(SkPaint::kStroke_Style);
81        outlinePaint.setStrokeWidth(0.f);
82
83        canvas->translate(15.f, 15.f);
84
85        // draw glyphs scaled up
86        canvas->scale(2.f, 2.f);
87
88        static const SkShader::TileMode kTileModes[] = {
89            SkShader::kRepeat_TileMode,
90            SkShader::kMirror_TileMode,
91        };
92
93        // position the baseline of the first run
94        canvas->translate(0.f, 0.75f * kPointSize);
95
96        canvas->save();
97        int i = 0;
98        for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
99            for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
100                SkMatrix localM;
101                localM.setTranslate(5.f, 5.f);
102                localM.postRotate(20);
103                localM.postScale(1.15f, .85f);
104
105                SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(fBmp,
106                                                                           kTileModes[tm0],
107                                                                           kTileModes[tm1],
108                                                                           &localM));
109
110                SkPaint fillPaint;
111                fillPaint.setAntiAlias(true);
112                fillPaint.setTextSize(SkIntToScalar(kPointSize));
113                fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
114                fillPaint.setShader(shader);
115
116                canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
117                canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
118                SkScalar w = fillPaint.measureText(kText, kTextLen);
119                canvas->translate(w + 10.f, 0.f);
120                ++i;
121                if (!(i % 2)) {
122                    canvas->restore();
123                    canvas->translate(0, 0.75f * kPointSize);
124                    canvas->save();
125                }
126            }
127        }
128        canvas->restore();
129    }
130
131private:
132    SkBitmap fBmp;
133    typedef GM INHERITED;
134};
135
136///////////////////////////////////////////////////////////////////////////////
137
138static GM* MyFactory(void*) { return new ShaderText3GM; }
139static GMRegistry reg(MyFactory);
140}
141