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 "sk_tool_utils.h"
10#include "SkCanvas.h"
11#include "SkGradientShader.h"
12
13namespace skiagm {
14
15static void makebm(SkBitmap* bm, int w, int h) {
16    bm->allocN32Pixels(w, h);
17    bm->eraseColor(SK_ColorTRANSPARENT);
18
19    SkCanvas    canvas(*bm);
20    SkScalar    s = SkIntToScalar(SkMin32(w, h));
21    const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
22    const SkPoint     kPts1[] = { { s/2, 0 }, { s/2, s } };
23    const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
24    const SkColor kColors0[] = {0x80F00080, 0xF0F08000, 0x800080F0 };
25    const SkColor kColors1[] = {0xF08000F0, 0x8080F000, 0xF000F080 };
26
27
28    SkPaint     paint;
29
30    paint.setShader(SkGradientShader::MakeLinear(kPts0, kColors0, kPos,
31                    SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode));
32    canvas.drawPaint(paint);
33    paint.setShader(SkGradientShader::MakeLinear(kPts1, kColors1, kPos,
34                    SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode));
35    canvas.drawPaint(paint);
36}
37
38///////////////////////////////////////////////////////////////////////////////
39
40struct LabeledMatrix {
41    SkMatrix    fMatrix;
42    const char* fLabel;
43};
44
45constexpr char kText[] = "B";
46constexpr int kTextLen = SK_ARRAY_COUNT(kText) - 1;
47constexpr int kPointSize = 300;
48
49class ShaderText3GM : public GM {
50public:
51    ShaderText3GM() {
52        this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
53    }
54
55protected:
56
57    SkString onShortName() override {
58        return SkString("shadertext3");
59    }
60
61    SkISize onISize() override{ return SkISize::Make(820, 930); }
62
63    void onOnceBeforeDraw() override {
64        makebm(&fBmp, kPointSize / 4, kPointSize / 4);
65    }
66
67    void onDraw(SkCanvas* canvas) override {
68
69        SkPaint bmpPaint;
70        bmpPaint.setAntiAlias(true);
71        bmpPaint.setFilterQuality(kLow_SkFilterQuality);
72        bmpPaint.setAlpha(0x80);
73        canvas->drawBitmap(fBmp, 5.f, 5.f, &bmpPaint);
74
75        SkPaint outlinePaint;
76        outlinePaint.setAntiAlias(true);
77        sk_tool_utils::set_portable_typeface(&outlinePaint);
78        outlinePaint.setTextSize(SkIntToScalar(kPointSize));
79        outlinePaint.setStyle(SkPaint::kStroke_Style);
80        outlinePaint.setStrokeWidth(0.f);
81
82        canvas->translate(15.f, 15.f);
83
84        // draw glyphs scaled up
85        canvas->scale(2.f, 2.f);
86
87        constexpr SkShader::TileMode kTileModes[] = {
88            SkShader::kRepeat_TileMode,
89            SkShader::kMirror_TileMode,
90        };
91
92        // position the baseline of the first run
93        canvas->translate(0.f, 0.75f * kPointSize);
94
95        canvas->save();
96        int i = 0;
97        for (size_t tm0 = 0; tm0 < SK_ARRAY_COUNT(kTileModes); ++tm0) {
98            for (size_t tm1 = 0; tm1 < SK_ARRAY_COUNT(kTileModes); ++tm1) {
99                SkMatrix localM;
100                localM.setTranslate(5.f, 5.f);
101                localM.postRotate(20);
102                localM.postScale(1.15f, .85f);
103
104                SkPaint fillPaint;
105                fillPaint.setAntiAlias(true);
106                sk_tool_utils::set_portable_typeface(&fillPaint);
107                fillPaint.setTextSize(SkIntToScalar(kPointSize));
108                fillPaint.setFilterQuality(kLow_SkFilterQuality);
109                fillPaint.setShader(SkShader::MakeBitmapShader(fBmp, kTileModes[tm0],
110                                                               kTileModes[tm1], &localM));
111
112                canvas->drawText(kText, kTextLen, 0, 0, fillPaint);
113                canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
114                SkScalar w = fillPaint.measureText(kText, kTextLen);
115                canvas->translate(w + 10.f, 0.f);
116                ++i;
117                if (!(i % 2)) {
118                    canvas->restore();
119                    canvas->translate(0, 0.75f * kPointSize);
120                    canvas->save();
121                }
122            }
123        }
124        canvas->restore();
125    }
126
127private:
128    SkBitmap fBmp;
129    typedef GM INHERITED;
130};
131
132///////////////////////////////////////////////////////////////////////////////
133
134static GM* MyFactory(void*) { return new ShaderText3GM; }
135static GMRegistry reg(MyFactory);
136}
137