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 "samplecode/Sample.h"
8
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColorFilter.h"
11 #include "include/core/SkColorPriv.h"
12 #include "include/core/SkGraphics.h"
13 #include "include/core/SkPath.h"
14 #include "include/core/SkRegion.h"
15 #include "include/core/SkShader.h"
16 #include "include/core/SkStream.h"
17 #include "include/core/SkTextBlob.h"
18 #include "include/core/SkTime.h"
19 #include "include/core/SkTypeface.h"
20 #include "include/effects/SkGradientShader.h"
21 #include "include/utils/SkRandom.h"
22 #include "modules/skshaper/include/SkShaper.h"
23 #include "src/core/SkOSFile.h"
24 #include "src/shaders/SkColorShader.h"
25 #include "src/utils/SkUTF.h"
26
27 typedef std::unique_ptr<SkShaper> (*ShaperFactory)();
28
29 static const char gText[] =
30 "When in the Course of human events it becomes necessary for one people "
31 "to dissolve the political bands which have connected them with another "
32 "and to assume among the powers of the earth, the separate and equal "
33 "station to which the Laws of Nature and of Nature's God entitle them, "
34 "a decent respect to the opinions of mankind requires that they should "
35 "declare the causes which impel them to the separation.";
36
37 class TextBoxView : public Sample {
38 SkString fName;
39 public:
TextBoxView(ShaperFactory fact,const char suffix[])40 TextBoxView(ShaperFactory fact, const char suffix[]) : fShaper(fact()) {
41 fName.printf("TextBox_%s", suffix);
42 }
43
44 protected:
name()45 SkString name() override { return fName; }
46
drawTest(SkCanvas * canvas,SkScalar w,SkScalar h,SkColor fg,SkColor bg)47 void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
48 SkAutoCanvasRestore acr(canvas, true);
49
50 canvas->clipRect(SkRect::MakeWH(w, h));
51 canvas->drawColor(bg);
52
53 SkScalar margin = 20;
54
55 SkPaint paint;
56 paint.setColor(fg);
57
58 for (int i = 9; i < 24; i += 2) {
59 SkShaper::PurgeCaches();
60 SkTextBlobBuilderRunHandler builder(gText, { margin, margin });
61 SkFont srcFont(nullptr, SkIntToScalar(i));
62 srcFont.setEdging(SkFont::Edging::kSubpixelAntiAlias);
63 srcFont.setSubpixel(true);
64
65 const char* utf8 = gText;
66 size_t utf8Bytes = sizeof(gText) - 1;
67
68 std::unique_ptr<SkShaper::BiDiRunIterator> bidi(
69 SkShaper::MakeBiDiRunIterator(utf8, utf8Bytes, 0xfe));
70 if (!bidi) {
71 return;
72 }
73
74 std::unique_ptr<SkShaper::LanguageRunIterator> language(
75 SkShaper::MakeStdLanguageRunIterator(utf8, utf8Bytes));
76 if (!language) {
77 return;
78 }
79
80 SkFourByteTag undeterminedScript = SkSetFourByteTag('Z','y','y','y');
81 std::unique_ptr<SkShaper::ScriptRunIterator> script(
82 SkShaper::MakeScriptRunIterator(utf8, utf8Bytes, undeterminedScript));
83 if (!script) {
84 return;
85 }
86
87 std::unique_ptr<SkShaper::FontRunIterator> font(
88 SkShaper::MakeFontMgrRunIterator(utf8, utf8Bytes, srcFont, SkFontMgr::RefDefault(),
89 "Arial", SkFontStyle::Bold(), &*language));
90 if (!font) {
91 return;
92 }
93
94 fShaper->shape(utf8, utf8Bytes, *font, *bidi, *script, *language, w - margin, &builder);
95 canvas->drawTextBlob(builder.makeBlob(), 0, 0, paint);
96
97 canvas->translate(0, builder.endPoint().y());
98 }
99 }
100
onDrawContent(SkCanvas * canvas)101 void onDrawContent(SkCanvas* canvas) override {
102 SkScalar width = this->width() / 3;
103 drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
104 canvas->translate(width, 0);
105 drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
106 canvas->translate(width, 0);
107 drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
108 canvas->translate(0, this->height()/2);
109 drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
110 }
111
112 private:
113 std::unique_ptr<SkShaper> fShaper;
114 using INHERITED = Sample;
115 };
116
__anonda0c2d670102()117 DEF_SAMPLE( return new TextBoxView([](){ return SkShaper::Make(); }, "default"); );
118 #ifdef SK_SHAPER_CORETEXT_AVAILABLE
119 DEF_SAMPLE( return new TextBoxView(SkShaper::MakeCoreText, "coretext"); );
120 #endif
121
122 class SampleShaper : public Sample {
123 public:
SampleShaper()124 SampleShaper() {}
125
126 protected:
name()127 SkString name() override { return SkString("shaper"); }
128
drawTest(SkCanvas * canvas,const char str[],SkScalar size,std::unique_ptr<SkShaper> shaper)129 void drawTest(SkCanvas* canvas, const char str[], SkScalar size,
130 std::unique_ptr<SkShaper> shaper) {
131 if (!shaper) return;
132
133 SkTextBlobBuilderRunHandler builder(str, {0, 0});
134 SkFont srcFont;
135 srcFont.setSize(size);
136 srcFont.setEdging(SkFont::Edging::kSubpixelAntiAlias);
137 srcFont.setSubpixel(true);
138
139 size_t len = strlen(str);
140
141 std::unique_ptr<SkShaper::BiDiRunIterator> bidi(
142 SkShaper::MakeBiDiRunIterator(str, len, 0xfe));
143 if (!bidi) {
144 return;
145 }
146
147 std::unique_ptr<SkShaper::LanguageRunIterator> language(
148 SkShaper::MakeStdLanguageRunIterator(str, len));
149 if (!language) {
150 return;
151 }
152
153 SkFourByteTag undeterminedScript = SkSetFourByteTag('Z','y','y','y');
154 std::unique_ptr<SkShaper::ScriptRunIterator> script(
155 SkShaper::MakeScriptRunIterator(str, len, undeterminedScript));
156 if (!script) {
157 return;
158 }
159
160 std::unique_ptr<SkShaper::FontRunIterator> font(
161 SkShaper::MakeFontMgrRunIterator(str, len, srcFont, SkFontMgr::RefDefault(),
162 "Arial", SkFontStyle::Bold(), &*language));
163 if (!font) {
164 return;
165 }
166
167 shaper->shape(str, len, *font, *bidi, *script, *language, 2000, &builder);
168
169 canvas->drawTextBlob(builder.makeBlob(), 0, 0, SkPaint());
170 }
171
onDrawContent(SkCanvas * canvas)172 void onDrawContent(SkCanvas* canvas) override {
173 canvas->translate(10, 30);
174
175 const char text[] = "world";
176
177 for (SkScalar size = 30; size <= 30; size += 10) {
178 this->drawTest(canvas, text, size, SkShaper::Make());
179 canvas->translate(0, size + 5);
180 #ifdef SK_SHAPER_CORETEXT_AVAILABLE
181 this->drawTest(canvas, text, size, SkShaper::MakeCoreText());
182 #endif
183 canvas->translate(0, size*2);
184 }
185 }
186
187 private:
188 using INHERITED = Sample;
189 };
190 DEF_SAMPLE( return new SampleShaper; );
191