1 /*
2 * Copyright 2013 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
11 #include "Sk2DPathEffect.h"
12 #include "SkBlurMask.h"
13 #include "SkBlurMaskFilter.h"
14 #include "SkColorMatrixFilter.h"
15 #include "SkCanvas.h"
16 #include "SkGradientShader.h"
17 #include "SkGraphics.h"
18 #include "SkLayerDrawLooper.h"
19 #include "SkRandom.h"
20 #include "SkTextBlob.h"
21
22 namespace skiagm {
23
24 constexpr int kWidth = 1250;
25 constexpr int kHeight = 700;
26
27 // Unlike the variant in sk_tool_utils, this version positions the glyphs on a diagonal
add_to_text_blob(SkTextBlobBuilder * builder,const char * text,const SkPaint & origPaint,SkScalar x,SkScalar y)28 static void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
29 SkScalar x, SkScalar y) {
30 SkPaint paint(origPaint);
31 SkTDArray<uint16_t> glyphs;
32
33 size_t len = strlen(text);
34 glyphs.append(paint.textToGlyphs(text, len, nullptr));
35 paint.textToGlyphs(text, len, glyphs.begin());
36
37 const SkScalar advanceX = paint.getTextSize() * 0.85f;
38 const SkScalar advanceY = paint.getTextSize() * 1.5f;
39
40 SkTDArray<SkScalar> pos;
41 for (unsigned i = 0; i < len; ++i) {
42 *pos.append() = x + i * advanceX;
43 *pos.append() = y + i * (advanceY / len);
44 }
45
46 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
47 const SkTextBlobBuilder::RunBuffer& run = builder->allocRunPos(paint, glyphs.count());
48 memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
49 memcpy(run.pos, pos.begin(), len * sizeof(SkScalar) * 2);
50 }
51
52 typedef void (*LooperProc)(SkPaint*);
53
54 struct LooperSettings {
55 SkBlendMode fMode;
56 SkColor fColor;
57 SkPaint::Style fStyle;
58 SkScalar fWidth;
59 SkScalar fOffset;
60 SkScalar fSkewX;
61 bool fEffect;
62 };
63
mask_filter(SkPaint * paint)64 static void mask_filter(SkPaint* paint) {
65 paint->setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
66 SkBlurMask::ConvertRadiusToSigma(3.f)));
67 }
68
make_tile_effect()69 static sk_sp<SkPathEffect> make_tile_effect() {
70 SkMatrix m;
71 m.setScale(1.f, 1.f);
72
73 SkPath path;
74 path.addCircle(0, 0, SkIntToScalar(5));
75
76 return SkPath2DPathEffect::Make(m, path);
77 }
78
path_effect(SkPaint * paint)79 static void path_effect(SkPaint* paint) {
80 paint->setPathEffect(make_tile_effect());
81 }
82
make_shader(const SkRect & bounds)83 static sk_sp<SkShader> make_shader(const SkRect& bounds) {
84 const SkPoint pts[] = {
85 { bounds.left(), bounds.top() },
86 { bounds.right(), bounds.bottom() },
87 };
88 const SkColor colors[] = {
89 SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK,
90 SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
91 };
92 return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
93 SkShader::kClamp_TileMode);
94 }
95
color_filter(SkPaint * paint)96 static void color_filter(SkPaint* paint) {
97 SkRect r;
98 r.setWH(SkIntToScalar(kWidth), 50);
99 paint->setShader(make_shader(r));
100 paint->setColorFilter(SkColorMatrixFilter::MakeLightingFilter(0xF0F0F0, 0));
101 }
102
kitchen_sink(SkPaint * paint)103 static void kitchen_sink(SkPaint* paint) {
104 color_filter(paint);
105 path_effect(paint);
106 mask_filter(paint);
107
108 }
109
setupLooper(SkLayerDrawLooper::BitFlags bits,LooperProc proc,const LooperSettings settings[],size_t size)110 static sk_sp<SkDrawLooper> setupLooper(SkLayerDrawLooper::BitFlags bits,
111 LooperProc proc,
112 const LooperSettings settings[],
113 size_t size) {
114 SkLayerDrawLooper::Builder looperBuilder;
115
116 SkLayerDrawLooper::LayerInfo info;
117 info.fPaintBits = bits;
118
119 info.fColorMode = SkBlendMode::kSrc;
120
121 for (size_t i = 0; i < size; i++) {
122 info.fOffset.set(settings[i].fOffset, settings[i].fOffset);
123 SkPaint* paint = looperBuilder.addLayer(info);
124 paint->setBlendMode(settings[i].fMode);
125 paint->setColor(settings[i].fColor);
126 paint->setStyle(settings[i].fStyle);
127 paint->setStrokeWidth(settings[i].fWidth);
128 if (settings[i].fEffect) {
129 (*proc)(paint);
130 }
131 }
132 return looperBuilder.detach();
133 }
134
135 class TextBlobLooperGM : public GM {
136 public:
TextBlobLooperGM()137 TextBlobLooperGM() {}
138
139 protected:
onOnceBeforeDraw()140 void onOnceBeforeDraw() override {
141 SkTextBlobBuilder builder;
142
143 // LCD
144 SkPaint paint;
145 paint.setTextSize(32);
146 const char* text = "The quick brown fox jumps over the lazy dog";
147 paint.setSubpixelText(true);
148 paint.setLCDRenderText(true);
149 paint.setAntiAlias(true);
150 sk_tool_utils::set_portable_typeface(&paint);
151 add_to_text_blob(&builder, text, paint, 0, 0);
152 fBlob = builder.make();
153
154 // create a looper which sandwhiches an effect in two normal draws
155 LooperSettings looperSandwhich[] = {
156 { SkBlendMode::kSrc, SK_ColorMAGENTA, SkPaint::kFill_Style, 0, 0, 0, false },
157 { SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true },
158 { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
159 };
160
161 LooperSettings compound[] = {
162 { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
163 { SkBlendMode::kSrc, SK_ColorRED, SkPaint::kStroke_Style, 4.f, 0, 0, false },
164 { SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 0, 0, false },
165 { SkBlendMode::kSrcOver, 0x88000000, SkPaint::kFill_Style, 0, 10.f, 0, true }
166 };
167
168 LooperSettings xfermode[] = {
169 { SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 0, 0, 0, false },
170 { SkBlendMode::kSrcOver, 0xFF000000, SkPaint::kFill_Style, 0, 1.f, 0, true },
171 { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 2.f, 0, false },
172 };
173
174 // NOTE, this should be ignored by textblobs
175 LooperSettings skew[] = {
176 { SkBlendMode::kSrc, SK_ColorRED, SkPaint::kFill_Style, 0, 0, -1.f, false },
177 { SkBlendMode::kSrc, SK_ColorGREEN, SkPaint::kFill_Style, 0, 10.f, -1.f, false },
178 { SkBlendMode::kSrc, SK_ColorBLUE, SkPaint::kFill_Style, 0, 20.f, -1.f, false },
179 };
180
181 LooperSettings kitchenSink[] = {
182 { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kStroke_Style, 1.f * 3/4, 0, 0, false },
183 { SkBlendMode::kSrc, SK_ColorBLACK, SkPaint::kFill_Style, 0, 0, 0, false },
184 { SkBlendMode::kDifference, SK_ColorWHITE, SkPaint::kFill_Style, 1.f, 10.f, 0, false },
185 { SkBlendMode::kSrc, SK_ColorWHITE, SkPaint::kFill_Style, 0, 10.f, 0, true },
186 { SkBlendMode::kSrcOver, 0x50FF00FF, SkPaint::kFill_Style, 0, 20.f, 0, false },
187 };
188
189 fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
190 SkLayerDrawLooper::kXfermode_Bit |
191 SkLayerDrawLooper::kStyle_Bit, &mask_filter,
192 compound, SK_ARRAY_COUNT(compound)));
193 fLoopers.push_back(setupLooper(SkLayerDrawLooper::kPathEffect_Bit |
194 SkLayerDrawLooper::kXfermode_Bit, &path_effect,
195 looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
196 fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
197 SkLayerDrawLooper::kColorFilter_Bit |
198 SkLayerDrawLooper::kXfermode_Bit, &color_filter,
199 looperSandwhich, SK_ARRAY_COUNT(looperSandwhich)));
200 fLoopers.push_back(setupLooper(SkLayerDrawLooper::kShader_Bit |
201 SkLayerDrawLooper::kColorFilter_Bit |
202 SkLayerDrawLooper::kXfermode_Bit, &color_filter,
203 xfermode, SK_ARRAY_COUNT(xfermode)));
204 fLoopers.push_back(setupLooper(0, nullptr, skew, SK_ARRAY_COUNT(skew)));
205 fLoopers.push_back(setupLooper(SkLayerDrawLooper::kMaskFilter_Bit |
206 SkLayerDrawLooper::kShader_Bit |
207 SkLayerDrawLooper::kColorFilter_Bit |
208 SkLayerDrawLooper::kPathEffect_Bit |
209 SkLayerDrawLooper::kStyle_Bit |
210 SkLayerDrawLooper::kXfermode_Bit, &kitchen_sink,
211 kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
212
213 // Test we respect overrides
214 fLoopers.push_back(setupLooper(0, &kitchen_sink,
215 kitchenSink, SK_ARRAY_COUNT(kitchenSink)));
216 }
217
onShortName()218 SkString onShortName() override {
219 return SkString("textbloblooper");
220 }
221
onISize()222 SkISize onISize() override {
223 return SkISize::Make(kWidth, kHeight);
224 }
225
onDraw(SkCanvas * canvas)226 void onDraw(SkCanvas* canvas) override {
227
228 canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
229
230 SkPaint paint;
231 canvas->translate(10, 40);
232
233 paint.setTextSize(40);
234
235 SkRect bounds = fBlob->bounds();
236
237 int y = 0;
238 for (int looper = 0; looper < fLoopers.count(); looper++) {
239 paint.setLooper(fLoopers[looper]);
240 canvas->save();
241 canvas->translate(0, SkIntToScalar(y));
242 canvas->drawTextBlob(fBlob, 0, 0, paint);
243 canvas->restore();
244 y += SkScalarFloorToInt(bounds.height());
245 }
246 }
247
248 private:
249 sk_sp<SkTextBlob> fBlob;
250 SkTArray<sk_sp<SkDrawLooper>, true> fLoopers;
251
252 typedef GM INHERITED;
253 };
254
255 //////////////////////////////////////////////////////////////////////////////
256
257 DEF_GM(return new TextBlobLooperGM;)
258 }
259