2 * Copyright 2011 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
9 #include "sk_tool_utils.h"
11 #include "SkGradientShader.h"
16 static void makebm(SkBitmap* bm, int w, int h) {
17 bm->allocN32Pixels(w, h);
18 bm->eraseColor(SK_ColorTRANSPARENT);
21 SkScalar s = SkIntToScalar(SkMin32(w, h));
22 SkPoint pts[] = { { 0, 0 }, { s, s } };
23 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
24 SkScalar pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
27 paint.setDither(true);
28 paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos, SK_ARRAY_COUNT(colors),
29 SkShader::kClamp_TileMode));
30 canvas.drawPaint(paint);
33 ///////////////////////////////////////////////////////////////////////////////
37 const SkColor* fColors;
41 constexpr SkColor gColors[] = {
42 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
45 constexpr GradData gGradData[] = {
46 { 2, gColors, nullptr },
47 { 5, gColors, nullptr },
50 static sk_sp<SkShader> MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
51 return SkGradientShader::MakeLinear(pts, data.fColors, data.fPos, data.fCount, tm);
54 static sk_sp<SkShader> MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
56 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
57 SkScalarAve(pts[0].fY, pts[1].fY));
58 return SkGradientShader::MakeRadial(center, center.fX, data.fColors, data.fPos, data.fCount,
62 static sk_sp<SkShader> MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
64 center.set(SkScalarAve(pts[0].fX, pts[1].fX),
65 SkScalarAve(pts[0].fY, pts[1].fY));
66 return SkGradientShader::MakeSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
69 static sk_sp<SkShader> Make2Conical(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
70 SkPoint center0, center1;
71 center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
72 SkScalarAve(pts[0].fY, pts[1].fY));
73 center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
74 SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
75 return SkGradientShader::MakeTwoPointConical(
76 center1, (pts[1].fX - pts[0].fX) / 7,
77 center0, (pts[1].fX - pts[0].fX) / 2,
78 data.fColors, data.fPos, data.fCount, tm);
81 typedef sk_sp<SkShader> (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
83 constexpr GradMaker gGradMakers[] = {
84 MakeLinear, MakeRadial, MakeSweep, Make2Conical
87 ///////////////////////////////////////////////////////////////////////////////
89 class ShaderTextGM : public GM {
92 this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
97 SkString onShortName() override {
98 return SkString("shadertext");
101 SkISize onISize() override { return SkISize::Make(1450, 500); }
103 void onDraw(SkCanvas* canvas) override {
104 const char text[] = "Shaded Text";
105 const int textLen = SK_ARRAY_COUNT(text) - 1;
106 const int pointSize = 36;
108 const int w = pointSize * textLen;
109 const int h = pointSize;
113 { SkIntToScalar(w), SkIntToScalar(h) }
115 SkScalar textBase = SkIntToScalar(h/2);
117 SkShader::TileMode tileModes[] = {
118 SkShader::kClamp_TileMode,
119 SkShader::kRepeat_TileMode,
120 SkShader::kMirror_TileMode
123 constexpr int gradCount = SK_ARRAY_COUNT(gGradData) *
124 SK_ARRAY_COUNT(gGradMakers);
125 constexpr int bmpCount = SK_ARRAY_COUNT(tileModes) *
126 SK_ARRAY_COUNT(tileModes);
127 sk_sp<SkShader> shaders[gradCount + bmpCount];
130 for (size_t d = 0; d < SK_ARRAY_COUNT(gGradData); ++d) {
131 for (size_t m = 0; m < SK_ARRAY_COUNT(gGradMakers); ++m) {
132 shaders[shdIdx++] = gGradMakers[m](pts,
134 SkShader::kClamp_TileMode);
139 makebm(&bm, w/16, h/4);
140 for (size_t tx = 0; tx < SK_ARRAY_COUNT(tileModes); ++tx) {
141 for (size_t ty = 0; ty < SK_ARRAY_COUNT(tileModes); ++ty) {
142 shaders[shdIdx++] = SkShader::MakeBitmapShader(bm, tileModes[tx], tileModes[ty]);
147 paint.setDither(true);
148 paint.setAntiAlias(true);
149 sk_tool_utils::set_portable_typeface(&paint);
150 paint.setTextSize(SkIntToScalar(pointSize));
153 canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
156 path.arcTo(SkRect::MakeXYWH(SkIntToScalar(-40), SkIntToScalar(15),
157 SkIntToScalar(300), SkIntToScalar(90)),
158 SkIntToScalar(225), SkIntToScalar(90),
162 constexpr int testsPerCol = 8;
163 constexpr int rowHeight = 60;
164 constexpr int colWidth = 300;
166 for (int s = 0; s < static_cast<int>(SK_ARRAY_COUNT(shaders)); s++) {
169 canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
170 SkIntToScalar((i % testsPerCol) * rowHeight));
171 paint.setShader(shaders[s]);
172 canvas->drawText(text, textLen, 0, textBase, paint);
176 canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
177 SkIntToScalar((i % testsPerCol) * rowHeight));
178 canvas->drawTextOnPath(text, textLen, path, nullptr, paint);
186 typedef GM INHERITED;
189 ///////////////////////////////////////////////////////////////////////////////
191 static GM* MyFactory(void*) { return new ShaderTextGM; }
192 static GMRegistry reg(MyFactory);