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
12 namespace skiagm {
13
makebm(SkBitmap * bm,int w,int h)14 static 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
39 struct LabeledMatrix {
40 SkMatrix fMatrix;
41 const char* fLabel;
42 };
43
44 static const char kText[] = "B";
45 static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
46 static const int kPointSize = 300;
47
48 class ShaderText3GM : public GM {
49 public:
ShaderText3GM()50 ShaderText3GM() {
51 this->setBGColor(0xFFDDDDDD);
52 }
53
54 protected:
onGetFlags() const55 virtual uint32_t onGetFlags() const SK_OVERRIDE {
56 return kSkipTiled_Flag;
57 }
58
onShortName()59 virtual SkString onShortName() SK_OVERRIDE {
60 return SkString("shadertext3");
61 }
62
onISize()63 virtual SkISize onISize() SK_OVERRIDE{ return SkISize::Make(800, 1000); }
64
onOnceBeforeDraw()65 virtual void onOnceBeforeDraw() SK_OVERRIDE {
66 makebm(&fBmp, kPointSize / 4, kPointSize / 4);
67 }
68
onDraw(SkCanvas * canvas)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
131 private:
132 SkBitmap fBmp;
133 typedef GM INHERITED;
134 };
135
136 ///////////////////////////////////////////////////////////////////////////////
137
MyFactory(void *)138 static GM* MyFactory(void*) { return new ShaderText3GM; }
139 static GMRegistry reg(MyFactory);
140 }
141