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
11 namespace skiagm {
12
makebm(SkBitmap * bm,int w,int h)13 static void makebm(SkBitmap* bm, int w, int h) {
14 bm->allocN32Pixels(w, h);
15 bm->eraseColor(SK_ColorTRANSPARENT);
16
17 SkCanvas canvas(*bm);
18 SkScalar s = SkIntToScalar(SkMin32(w, h));
19 static const SkPoint kPts0[] = { { 0, 0 }, { s, s } };
20 static const SkPoint kPts1[] = { { s, 0 }, { 0, s } };
21 static const SkScalar kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
22 static const SkColor kColors0[] = {0x40FF00FF, 0xF0FFFF00, 0x4000FFFF };
23 static const SkColor kColors1[] = {0xF0FF00FF, 0x80FFFF00, 0xF000FFFF };
24
25
26 SkPaint paint;
27
28 paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
29 SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
30 canvas.drawPaint(paint);
31 paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
32 SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
33 canvas.drawPaint(paint);
34 }
35
36 ///////////////////////////////////////////////////////////////////////////////
37
38 struct LabeledMatrix {
39 SkMatrix fMatrix;
40 const char* fLabel;
41 };
42
43 class ShaderText2GM : public GM {
44 public:
ShaderText2GM()45 ShaderText2GM() {
46 this->setBGColor(0xFFDDDDDD);
47 }
48
49 protected:
50
onShortName()51 SkString onShortName() {
52 return SkString("shadertext2");
53 }
54
onISize()55 SkISize onISize() { return SkISize::Make(1800, 900); }
56
onDraw(SkCanvas * canvas)57 virtual void onDraw(SkCanvas* canvas) {
58 static const char kText[] = "SKIA";
59 static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
60 static const int kPointSize = 55;
61
62 SkTDArray<LabeledMatrix> matrices;
63 matrices.append()->fMatrix.reset();
64 matrices.top().fLabel = "Identity";
65 matrices.append()->fMatrix.setScale(1.2f, 0.8f);
66 matrices.top().fLabel = "Scale";
67 matrices.append()->fMatrix.setRotate(10.f);
68 matrices.top().fLabel = "Rotate";
69 matrices.append()->fMatrix.reset();
70 matrices.top().fMatrix.setPerspX(-0.0015f);
71 matrices.top().fMatrix.setPerspY(+0.0015f);
72 matrices.top().fLabel = "Persp";
73
74 SkTDArray<LabeledMatrix> localMatrices;
75 localMatrices.append()->fMatrix.reset();
76 localMatrices.top().fLabel = "Identity";
77 localMatrices.append()->fMatrix.setScale(2.5f, 0.2f);
78 localMatrices.top().fLabel = "Scale";
79 localMatrices.append()->fMatrix.setRotate(45.f);
80 localMatrices.top().fLabel = "Rotate";
81 localMatrices.append()->fMatrix.reset();
82 localMatrices.top().fMatrix.setPerspX(-0.007f);
83 localMatrices.top().fMatrix.setPerspY(+0.008f);
84 localMatrices.top().fLabel = "Persp";
85
86 static SkBitmap bmp;
87 if (bmp.isNull()) {
88 makebm(&bmp, kPointSize / 2, kPointSize / 2);
89 }
90
91 SkPaint fillPaint;
92 fillPaint.setAntiAlias(true);
93 fillPaint.setTextSize(SkIntToScalar(kPointSize));
94 fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
95
96 SkPaint outlinePaint;
97 outlinePaint.setAntiAlias(true);
98 outlinePaint.setTextSize(SkIntToScalar(kPointSize));
99 outlinePaint.setStyle(SkPaint::kStroke_Style);
100 outlinePaint.setStrokeWidth(0.f);
101
102 SkScalar w = fillPaint.measureText(kText, kTextLen);
103 static SkScalar kPadY = 0.5f * kPointSize;
104 static SkScalar kPadX = 1.5f * kPointSize;
105
106 SkPaint strokePaint(fillPaint);
107 strokePaint.setStyle(SkPaint::kStroke_Style);
108 strokePaint.setStrokeWidth(kPointSize * 0.1f);
109
110 SkPaint labelPaint;
111 labelPaint.setColor(0xff000000);
112 labelPaint.setAntiAlias(true);
113 labelPaint.setTextSize(12.f);
114
115 canvas->translate(15.f, 15.f);
116 canvas->drawBitmap(bmp, 0, 0);
117 canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);
118
119 static const char kLabelLabel[] = "localM / canvasM";
120 canvas->drawText(kLabelLabel, strlen(kLabelLabel), 0, 0, labelPaint);
121 canvas->translate(0, 15.f);
122
123 canvas->save();
124 SkScalar maxLabelW = 0;
125 canvas->translate(0, kPadY / 2 + kPointSize);
126 for (int lm = 0; lm < localMatrices.count(); ++lm) {
127 canvas->drawText(matrices[lm].fLabel, strlen(matrices[lm].fLabel),
128 0, labelPaint.getTextSize() - 1, labelPaint);
129 SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
130 strlen(matrices[lm].fLabel));
131 maxLabelW = SkMaxScalar(maxLabelW, labelW);
132 canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
133 }
134 canvas->restore();
135
136 canvas->translate(maxLabelW + kPadX / 2.f, 0.f);
137
138 for (int s = 0; s < 2; ++s) {
139 SkPaint& paint = s ? strokePaint : fillPaint;
140
141 SkScalar columnH = 0;
142 for (int m = 0; m < matrices.count(); ++m) {
143 columnH = 0;
144 canvas->save();
145 canvas->drawText(matrices[m].fLabel, strlen(matrices[m].fLabel),
146 0, labelPaint.getTextSize() - 1, labelPaint);
147 canvas->translate(0, kPadY / 2 + kPointSize);
148 columnH += kPadY / 2 + kPointSize;
149 for (int lm = 0; lm < localMatrices.count(); ++lm) {
150 paint.setShader(
151 SkShader::CreateBitmapShader(bmp,
152 SkShader::kMirror_TileMode,
153 SkShader::kRepeat_TileMode,
154 &localMatrices[lm].fMatrix))->unref();
155
156 canvas->save();
157 canvas->concat(matrices[m].fMatrix);
158 canvas->drawText(kText, kTextLen, 0, 0, paint);
159 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
160 canvas->restore();
161
162 SkPath path;
163 path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
164 1.2f * w, 2.f * kPointSize),
165 225.f, 359.f,
166 false);
167 path.close();
168
169 canvas->translate(0.f, kPointSize + kPadY);
170 columnH += kPointSize + kPadY;
171
172 canvas->save();
173 canvas->concat(matrices[m].fMatrix);
174 canvas->drawTextOnPath(kText, kTextLen, path, NULL, paint);
175 canvas->drawTextOnPath(kText, kTextLen, path, NULL, outlinePaint);
176 canvas->restore();
177 SkPaint stroke;
178 stroke.setStyle(SkPaint::kStroke_Style);
179 canvas->translate(0.f, kPointSize + kPadY);
180 columnH += kPointSize + kPadY;
181 }
182 canvas->restore();
183 canvas->translate(w + kPadX, 0.f);
184 }
185 if (0 == s) {
186 canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
187 canvas->translate(kPadX / 2, 0.f);
188 static const char kFillLabel[] = "Filled";
189 static const char kStrokeLabel[] = "Stroked";
190 SkScalar y = columnH + kPadY / 2;
191 SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
192 SkScalar strokeX = kPadX;
193 canvas->drawText(kFillLabel, strlen(kFillLabel), fillX, y, labelPaint);
194 canvas->drawText(kStrokeLabel, strlen(kStrokeLabel), strokeX, y, labelPaint);
195 }
196 }
197 }
198
onGetFlags() const199 virtual uint32_t onGetFlags() const SK_OVERRIDE {
200 // disable 565 for now, til mike fixes the debug assert
201 return kSkip565_Flag | kSkipTiled_Flag;
202 }
203
204 private:
205 typedef GM INHERITED;
206 };
207
208 ///////////////////////////////////////////////////////////////////////////////
209
MyFactory(void *)210 static GM* MyFactory(void*) { return new ShaderText2GM; }
211 static GMRegistry reg(MyFactory);
212 }
213