1 /*
2 * Copyright 2014 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/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkFont.h"
13 #include "include/core/SkFontArguments.h"
14 #include "include/core/SkFontMgr.h"
15 #include "include/core/SkFontTypes.h"
16 #include "include/core/SkImageInfo.h"
17 #include "include/core/SkPaint.h"
18 #include "include/core/SkPathEffect.h"
19 #include "include/core/SkPoint.h"
20 #include "include/core/SkScalar.h"
21 #include "include/core/SkTextBlob.h"
22 #include "include/core/SkTypeface.h"
23 #include "include/core/SkTypes.h"
24 #include "include/effects/SkDashPathEffect.h"
25 #include "tools/Resources.h"
26 #include "tools/ToolUtils.h"
27
test_nulldev(SkCanvas * canvas)28 static void test_nulldev(SkCanvas* canvas) {
29 SkBitmap bm;
30 bm.setInfo(SkImageInfo::MakeN32Premul(30, 30));
31 // notice: no pixels mom! be sure we don't crash
32 // https://code.google.com/p/chromium/issues/detail?id=352616
33 SkCanvas c(bm);
34
35 SkBitmap src;
36 src.allocN32Pixels(10, 10);
37 src.eraseColor(SK_ColorRED);
38
39 // ensure we don't crash
40 c.writePixels(src, 0, 0);
41 }
42
draw_text_stroked(SkCanvas * canvas,const SkPaint & paint,const SkFont & font,SkScalar strokeWidth)43 static void draw_text_stroked(SkCanvas* canvas, const SkPaint& paint, const SkFont& font,
44 SkScalar strokeWidth) {
45 SkPaint p(paint);
46 SkPoint loc = { 20, 435 };
47
48 if (strokeWidth > 0) {
49 p.setStyle(SkPaint::kFill_Style);
50 canvas->drawSimpleText("P", 1, SkTextEncoding::kUTF8, loc.fX, loc.fY - 225, font, p);
51 canvas->drawTextBlob(SkTextBlob::MakeFromPosText("P", 1, &loc, font), 0, 0, p);
52 }
53
54 p.setColor(SK_ColorRED);
55 p.setStyle(SkPaint::kStroke_Style);
56 p.setStrokeWidth(strokeWidth);
57
58 canvas->drawSimpleText("P", 1, SkTextEncoding::kUTF8, loc.fX, loc.fY - 225, font, p);
59 canvas->drawTextBlob(SkTextBlob::MakeFromPosText("P", 1, &loc, font), 0, 0, p);
60 }
61
draw_text_set(SkCanvas * canvas,const SkPaint & paint,const SkFont & font)62 static void draw_text_set(SkCanvas* canvas, const SkPaint& paint, const SkFont& font) {
63 SkAutoCanvasRestore acr(canvas, true);
64
65 draw_text_stroked(canvas, paint, font, 10);
66
67 canvas->translate(200, 0);
68 draw_text_stroked(canvas, paint, font, 0);
69
70 const SkScalar intervals[] = { 20, 10, 5, 10 };
71 const SkScalar phase = 0;
72
73 canvas->translate(200, 0);
74 SkPaint p(paint);
75 p.setPathEffect(SkDashPathEffect::Make(intervals, std::size(intervals), phase));
76 draw_text_stroked(canvas, p, font, 10);
77 }
78
79 namespace {
80 enum {
81 kBelowThreshold_TextSize = 255,
82 kAboveThreshold_TextSize = 257
83 };
84 } // namespace
85
86 DEF_SIMPLE_GM(stroketext, canvas, 1200, 480) {
87 if (true) { test_nulldev(canvas); }
88
89 SkPaint paint;
90 paint.setAntiAlias(true);
91
92 SkFont font(ToolUtils::create_portable_typeface(), kBelowThreshold_TextSize);
93 draw_text_set(canvas, paint, font);
94
95 canvas->translate(600, 0);
96 font.setSize(kAboveThreshold_TextSize);
97 draw_text_set(canvas, paint, font);
98 }
99
100 DEF_SIMPLE_GM_CAN_FAIL(stroketext_native, canvas, msg, 650, 420) {
101 sk_sp<SkTypeface> ttf = MakeResourceAsTypeface("fonts/Stroking.ttf");
102 sk_sp<SkTypeface> otf = MakeResourceAsTypeface("fonts/Stroking.otf");
103
__anonce7de39e0302() 104 sk_sp<SkTypeface> overlap = []() -> sk_sp<SkTypeface>{
105 std::unique_ptr<SkStreamAsset> variableStream(GetResourceAsStream("fonts/Variable.ttf"));
106 if (!variableStream) {
107 return nullptr;
108 }
109 const SkFontArguments::VariationPosition::Coordinate position[] = {
110 { SkSetFourByteTag('w','g','h','t'), 721.0f },
111 };
112 SkFontArguments params;
113 params.setVariationDesignPosition({position, std::size(position)});
114 return SkFontMgr::RefDefault()->makeFromStream(std::move(variableStream), params);
115 }();
116
117 if (!ttf && !otf && !overlap) {
118 msg->append("No support for ttf or otf.");
119 return skiagm::DrawResult::kSkip;
120 }
121
122 SkPaint p;
123 p.setAntiAlias(true);
124 p.setStyle(SkPaint::kStroke_Style);
125 p.setStrokeWidth(10);
126 p.setStrokeCap(SkPaint::kRound_Cap);
127 p.setStrokeJoin(SkPaint::kRound_Join);
128 p.setARGB(0xff, 0xbb, 0x00, 0x00);
129
130 if (ttf) {
131 /* Stroking.ttf is structured like:
132 nothing U+25CB ○ (nothing inside)
133 something U+25C9 ◉ (a tiny thing inside)
134 - off (point off / empty quad with implicit end) (before U+207B ⁻ / after U+208B ₋)
135 + on (point on / empty line) (before U+207A ⁺ / after U+208A ₊)
136 0 off off (two implicit quads) (before U+2070 ⁰ / after U+2080 ₀)
137 1 off on (quad with implicit close around) (before U+00B9 ¹ / after U+2081 ₁)
138 2 on off (quad with implicit close) (before U+00B2 ² / after U+2082 ₂)
139 3 on on (empty line) (before U+00B3 ³ / after U+2083 ₃)
140 */
141 SkFont font(ttf, 100);
142 canvas->drawString("○◉ ⁻₋⁺₊", 10, 100, font, p);
143 canvas->drawString("⁰₀¹₁²₂³₃", 10, 200, font, p);
144 }
145
146 if (otf) {
147 /* Stroking.otf is structured like:
148 nothing U+25CB ○
149 something U+25C9 ◉
150 0 moveto, moveto (before U+2070 ⁰) (nothing there, FreeType ignores these)
151 1 moveto, empty line, moveto (before U+00B9 ¹) (degenerate lineto)
152 3 moveto, empty cubic, moveto (before U+00B3 ³) (degenerate cubicto)
153 f moveto, empty flex, moveto (before U+1DA0 ᶠ) (degenerate flex)
154 */
155 SkFont font(otf, 100);
156 canvas->drawString("○◉ ⁰¹³ᶠ", 10, 300, font, p);
157 }
158
159 if (overlap) {
160 /* Variable.ttf is structured like:
161 U+74 t (glyf outline has overlap flag)
162 U+167 ŧ (glyf outline does not have overlap flag)
163 */
164 SkFont font(overlap, 100);
165 p.setStrokeWidth(1);
166 canvas->drawString("tŧ", 10, 400, font, p);
167 }
168
169 return skiagm::DrawResult::kOk;
170 }
171