1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "Minikin"
18 #include <cutils/log.h>
19 #include <string>
20
21 #include "SkPathMeasure.h"
22 #include "Paint.h"
23 #include "TypefaceImpl.h"
24
25 #include "MinikinUtils.h"
26
27 namespace android {
28
29 // Do an sprintf starting at offset n, abort on overflow
30 static int snprintfcat(char* buf, int off, int size, const char* format, ...)
31 __attribute__((__format__(__printf__, 4, 5)));
snprintfcat(char * buf,int off,int size,const char * format,...)32 static int snprintfcat(char* buf, int off, int size, const char* format, ...) {
33 va_list args;
34 va_start(args, format);
35 int n = vsnprintf(buf + off, size - off, format, args);
36 LOG_ALWAYS_FATAL_IF(n >= size - off, "String overflow in setting layout properties");
37 va_end(args);
38 return off + n;
39 }
40
doLayout(Layout * layout,const Paint * paint,int bidiFlags,TypefaceImpl * typeface,const uint16_t * buf,size_t start,size_t count,size_t bufSize)41 void MinikinUtils::doLayout(Layout* layout, const Paint* paint, int bidiFlags, TypefaceImpl* typeface,
42 const uint16_t* buf, size_t start, size_t count, size_t bufSize) {
43 TypefaceImpl* resolvedFace = TypefaceImpl_resolveDefault(typeface);
44 layout->setFontCollection(resolvedFace->fFontCollection);
45 FontStyle resolved = resolvedFace->fStyle;
46
47 /* Prepare minikin FontStyle */
48 std::string lang = paint->getTextLocale();
49 FontLanguage minikinLang(lang.c_str(), lang.size());
50 FontVariant minikinVariant = (paint->getFontVariant() == VARIANT_ELEGANT) ? VARIANT_ELEGANT
51 : VARIANT_COMPACT;
52 FontStyle minikinStyle(minikinLang, minikinVariant, resolved.getWeight(), resolved.getItalic());
53
54 /* Prepare minikin Paint */
55 MinikinPaint minikinPaint;
56 minikinPaint.size = (int)/*WHY?!*/paint->getTextSize();
57 minikinPaint.scaleX = paint->getTextScaleX();
58 minikinPaint.skewX = paint->getTextSkewX();
59 minikinPaint.letterSpacing = paint->getLetterSpacing();
60 minikinPaint.paintFlags = MinikinFontSkia::packPaintFlags(paint);
61 minikinPaint.fontFeatureSettings = paint->getFontFeatureSettings();
62
63 layout->doLayout(buf, start, count, bufSize, bidiFlags, minikinStyle, minikinPaint);
64 }
65
xOffsetForTextAlign(Paint * paint,const Layout & layout)66 float MinikinUtils::xOffsetForTextAlign(Paint* paint, const Layout& layout) {
67 switch (paint->getTextAlign()) {
68 case Paint::kCenter_Align:
69 return layout.getAdvance() * -0.5f;
70 break;
71 case Paint::kRight_Align:
72 return -layout.getAdvance();
73 break;
74 default:
75 break;
76 }
77 return 0;
78 }
79
hOffsetForTextAlign(Paint * paint,const Layout & layout,const SkPath & path)80 float MinikinUtils::hOffsetForTextAlign(Paint* paint, const Layout& layout, const SkPath& path) {
81 float align = 0;
82 switch (paint->getTextAlign()) {
83 case Paint::kCenter_Align:
84 align = -0.5f;
85 break;
86 case Paint::kRight_Align:
87 align = -1;
88 break;
89 default:
90 return 0;
91 }
92 SkPathMeasure measure(path, false);
93 return align * (layout.getAdvance() - measure.getLength());
94 }
95
96 }
97