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
27typedef std::unique_ptr<SkShaper> (*ShaperFactory)();
28
29static 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
37class TextBoxView : public Sample {
38    SkString fName;
39public:
40    TextBoxView(ShaperFactory fact, const char suffix[]) : fShaper(fact()) {
41        fName.printf("TextBox_%s", suffix);
42    }
43
44protected:
45    SkString name() override { return fName; }
46
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
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
112private:
113    std::unique_ptr<SkShaper> fShaper;
114    using INHERITED = Sample;
115};
116
117DEF_SAMPLE( return new TextBoxView([](){ return SkShaper::Make(); }, "default"); );
118#ifdef SK_SHAPER_CORETEXT_AVAILABLE
119DEF_SAMPLE( return new TextBoxView(SkShaper::MakeCoreText, "coretext"); );
120#endif
121
122class SampleShaper : public Sample {
123public:
124    SampleShaper() {}
125
126protected:
127    SkString name() override { return SkString("shaper"); }
128
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
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
187private:
188    using INHERITED = Sample;
189};
190DEF_SAMPLE( return new SampleShaper; );
191