MinikinUtils.h revision f2114d5646194100242206b267ddd6e7194b7da9 
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/**
18 * Utilities for making Minikin work, especially from existing objects like
19 * SkPaint and so on.
20 **/
21
22 // TODO: does this really need to be separate from MinikinSkia?
23
24#ifndef ANDROID_MINIKIN_UTILS_H
25#define ANDROID_MINIKIN_UTILS_H
26
27namespace android {
28
29class MinikinUtils {
30public:
31    static void SetLayoutProperties(Layout* layout, SkPaint* paint, int flags,
32        TypefaceImpl* face);
33    static float xOffsetForTextAlign(SkPaint* paint, const Layout& layout);
34
35    // f is a functor of type void f(SkTypeface *, size_t start, size_t end);
36    template <typename F>
37    static void forFontRun(const Layout& layout, F& f) {
38        SkTypeface* lastFace = NULL;
39        size_t start = 0;
40        size_t nGlyphs = layout.nGlyphs();
41        for (size_t i = 0; i < nGlyphs; i++) {
42            MinikinFontSkia* mfs = static_cast<MinikinFontSkia*>(layout.getFont(i));
43            SkTypeface* skFace = mfs->GetSkTypeface();
44            if (i > 0 && skFace != lastFace) {
45                f(lastFace, start, i);
46                start = i;
47            }
48            lastFace = skFace;
49        }
50        if (nGlyphs > start) {
51            f(lastFace, start, nGlyphs);
52        }
53    }
54};
55
56}  // namespace android
57
58#endif  // ANDROID_MINIKIN_UTILS_H
59