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 "SkPath.h"
11
makebm(SkBitmap * bm,int w,int h)12 static void makebm(SkBitmap* bm, int w, int h) {
13 bm->allocN32Pixels(w, h);
14 bm->eraseColor(SK_ColorTRANSPARENT);
15
16 SkCanvas canvas(*bm);
17 SkScalar s = SkIntToScalar(SkMin32(w, h));
18 static const SkPoint kPts0[] = { { 0, 0 }, { s, s } };
19 static const SkPoint kPts1[] = { { s, 0 }, { 0, s } };
20 static const SkScalar kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
21 static const SkColor kColors0[] = {0x40FF00FF, 0xF0FFFF00, 0x4000FFFF };
22 static const SkColor kColors1[] = {0xF0FF00FF, 0x80FFFF00, 0xF000FFFF };
23
24
25 SkPaint paint;
26
27 paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
28 SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
29 canvas.drawPaint(paint);
30 paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
31 SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
32 canvas.drawPaint(paint);
33 }
34
35 ///////////////////////////////////////////////////////////////////////////////
36
37 struct LabeledMatrix {
38 SkMatrix fMatrix;
39 const char* fLabel;
40 };
41
42 DEF_SIMPLE_GM_BG(shadertext2, canvas, 1800, 900,
43 sk_tool_utils::color_to_565(0xFFDDDDDD)) {
44 static const char kText[] = "SKIA";
45 static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
46 static const int kPointSize = 55;
47
48 SkTDArray<LabeledMatrix> matrices;
49 matrices.append()->fMatrix.reset();
50 matrices.top().fLabel = "Identity";
51 matrices.append()->fMatrix.setScale(1.2f, 0.8f);
52 matrices.top().fLabel = "Scale";
53 matrices.append()->fMatrix.setRotate(10.f);
54 matrices.top().fLabel = "Rotate";
55 matrices.append()->fMatrix.reset();
56 matrices.top().fMatrix.setPerspX(-0.0015f);
57 matrices.top().fMatrix.setPerspY(+0.0015f);
58 matrices.top().fLabel = "Persp";
59
60 SkTDArray<LabeledMatrix> localMatrices;
61 localMatrices.append()->fMatrix.reset();
62 localMatrices.top().fLabel = "Identity";
63 localMatrices.append()->fMatrix.setScale(2.5f, 0.2f);
64 localMatrices.top().fLabel = "Scale";
65 localMatrices.append()->fMatrix.setRotate(45.f);
66 localMatrices.top().fLabel = "Rotate";
67 localMatrices.append()->fMatrix.reset();
68 localMatrices.top().fMatrix.setPerspX(-0.007f);
69 localMatrices.top().fMatrix.setPerspY(+0.008f);
70 localMatrices.top().fLabel = "Persp";
71
72 static SkBitmap bmp;
73 if (bmp.isNull()) {
74 makebm(&bmp, kPointSize / 2, kPointSize / 2);
75 }
76
77 SkPaint fillPaint;
78 fillPaint.setAntiAlias(true);
79 sk_tool_utils::set_portable_typeface(&fillPaint);
80 fillPaint.setTextSize(SkIntToScalar(kPointSize));
81 fillPaint.setFilterQuality(kLow_SkFilterQuality);
82
83 SkPaint outlinePaint;
84 outlinePaint.setAntiAlias(true);
85 sk_tool_utils::set_portable_typeface(&outlinePaint);
86 outlinePaint.setTextSize(SkIntToScalar(kPointSize));
87 outlinePaint.setStyle(SkPaint::kStroke_Style);
88 outlinePaint.setStrokeWidth(0.f);
89
90 SkScalar w = fillPaint.measureText(kText, kTextLen);
91 static SkScalar kPadY = 0.5f * kPointSize;
92 static SkScalar kPadX = 1.5f * kPointSize;
93
94 SkPaint strokePaint(fillPaint);
95 strokePaint.setStyle(SkPaint::kStroke_Style);
96 strokePaint.setStrokeWidth(kPointSize * 0.1f);
97
98 SkPaint labelPaint;
99 labelPaint.setColor(0xff000000);
100 labelPaint.setAntiAlias(true);
101 sk_tool_utils::set_portable_typeface(&labelPaint);
102 labelPaint.setTextSize(12.f);
103
104 canvas->translate(15.f, 15.f);
105 canvas->drawBitmap(bmp, 0, 0);
106 canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);
107
108 static const char kLabelLabel[] = "localM / canvasM";
109 canvas->drawText(kLabelLabel, strlen(kLabelLabel), 0, 0, labelPaint);
110 canvas->translate(0, 15.f);
111
112 canvas->save();
113 SkScalar maxLabelW = 0;
114 canvas->translate(0, kPadY / 2 + kPointSize);
115 for (int lm = 0; lm < localMatrices.count(); ++lm) {
116 canvas->drawText(matrices[lm].fLabel, strlen(matrices[lm].fLabel),
117 0, labelPaint.getTextSize() - 1, labelPaint);
118 SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
119 strlen(matrices[lm].fLabel));
120 maxLabelW = SkMaxScalar(maxLabelW, labelW);
121 canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
122 }
123 canvas->restore();
124
125 canvas->translate(maxLabelW + kPadX / 2.f, 0.f);
126
127 for (int s = 0; s < 2; ++s) {
128 SkPaint& paint = s ? strokePaint : fillPaint;
129
130 SkScalar columnH = 0;
131 for (int m = 0; m < matrices.count(); ++m) {
132 columnH = 0;
133 canvas->save();
134 canvas->drawText(matrices[m].fLabel, strlen(matrices[m].fLabel),
135 0, labelPaint.getTextSize() - 1, labelPaint);
136 canvas->translate(0, kPadY / 2 + kPointSize);
137 columnH += kPadY / 2 + kPointSize;
138 for (int lm = 0; lm < localMatrices.count(); ++lm) {
139 paint.setShader(
140 SkShader::CreateBitmapShader(bmp,
141 SkShader::kMirror_TileMode,
142 SkShader::kRepeat_TileMode,
143 &localMatrices[lm].fMatrix))->unref();
144
145 canvas->save();
146 canvas->concat(matrices[m].fMatrix);
147 canvas->drawText(kText, kTextLen, 0, 0, paint);
148 canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
149 canvas->restore();
150
151 SkPath path;
152 path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
153 1.2f * w, 2.f * kPointSize),
154 225.f, 359.f,
155 false);
156 path.close();
157
158 canvas->translate(0.f, kPointSize + kPadY);
159 columnH += kPointSize + kPadY;
160
161 canvas->save();
162 canvas->concat(matrices[m].fMatrix);
163 canvas->drawTextOnPath(kText, kTextLen, path, nullptr, paint);
164 canvas->drawTextOnPath(kText, kTextLen, path, nullptr, outlinePaint);
165 canvas->restore();
166 SkPaint stroke;
167 stroke.setStyle(SkPaint::kStroke_Style);
168 canvas->translate(0.f, kPointSize + kPadY);
169 columnH += kPointSize + kPadY;
170 }
171 canvas->restore();
172 canvas->translate(w + kPadX, 0.f);
173 }
174 if (0 == s) {
175 canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
176 canvas->translate(kPadX / 2, 0.f);
177 static const char kFillLabel[] = "Filled";
178 static const char kStrokeLabel[] = "Stroked";
179 SkScalar y = columnH + kPadY / 2;
180 SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
181 SkScalar strokeX = kPadX;
182 canvas->drawText(kFillLabel, strlen(kFillLabel), fillX, y, labelPaint);
183 canvas->drawText(kStrokeLabel, strlen(kStrokeLabel), strokeX, y, labelPaint);
184 }
185 }
186 }
187