1/*
2 * Copyright (C) 2015 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
19#include "FreeTypeMinikinFontForTest.h"
20
21#include <fcntl.h>
22#include <sys/mman.h>
23#include <sys/stat.h>
24#include <sys/types.h>
25#include <unistd.h>
26#include <string>
27
28#include <ft2build.h>
29#include <log/log.h>
30#include FT_OUTLINE_H
31
32#include "minikin/MinikinFont.h"
33
34namespace minikin {
35namespace {
36
37static int uniqueId = 0;
38
39constexpr FT_Int32 LOAD_FLAG =
40        FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
41
42constexpr float FTPosToFloat(FT_Pos x) {
43    return x / 64.0;
44}
45
46constexpr FT_F26Dot6 FTFloatToF26Dot6(float x) {
47    return static_cast<FT_F26Dot6>(x * 64);
48}
49
50void loadGlyphOrDie(uint32_t glyphId, float size, FT_Face face) {
51    const FT_F26Dot6 scale = FTFloatToF26Dot6(size);
52    LOG_ALWAYS_FATAL_IF(FT_Set_Char_Size(face, scale, scale, 72 /* dpi */, 72 /* dpi */),
53                        "Failed to set character size.");
54    LOG_ALWAYS_FATAL_IF(FT_Load_Glyph(face, glyphId, LOAD_FLAG), "Failed to load glyph");
55    LOG_ALWAYS_FATAL_IF(face->glyph->format != FT_GLYPH_FORMAT_OUTLINE,
56                        "Only outline font is supported.");
57}
58
59}  // namespace
60
61FreeTypeMinikinFontForTest::FreeTypeMinikinFontForTest(const std::string& font_path, int index)
62        : MinikinFont(uniqueId++), mFontPath(font_path), mFontIndex(index) {
63    int fd = open(font_path.c_str(), O_RDONLY);
64    LOG_ALWAYS_FATAL_IF(fd == -1, "Open failed: %s", font_path.c_str());
65    struct stat st = {};
66    LOG_ALWAYS_FATAL_IF(fstat(fd, &st) != 0);
67    mFontSize = st.st_size;
68    mFontData = mmap(NULL, mFontSize, PROT_READ, MAP_SHARED, fd, 0);
69    LOG_ALWAYS_FATAL_IF(mFontData == nullptr);
70    close(fd);
71
72    LOG_ALWAYS_FATAL_IF(FT_Init_FreeType(&mFtLibrary), "Failed to initialize FreeType");
73
74    FT_Open_Args args;
75    args.flags = FT_OPEN_MEMORY;
76    args.memory_base = static_cast<const FT_Byte*>(mFontData);
77    args.memory_size = mFontSize;
78    LOG_ALWAYS_FATAL_IF(FT_Open_Face(mFtLibrary, &args, index, &mFtFace), "Failed to open FT_Face");
79}
80
81FreeTypeMinikinFontForTest::~FreeTypeMinikinFontForTest() {
82    FT_Done_Face(mFtFace);
83    FT_Done_FreeType(mFtLibrary);
84    munmap(mFontData, mFontSize);
85}
86
87float FreeTypeMinikinFontForTest::GetHorizontalAdvance(uint32_t glyphId, const MinikinPaint& paint,
88                                                       const FontFakery& /* fakery */) const {
89    loadGlyphOrDie(glyphId, paint.size, mFtFace);
90    return FTPosToFloat(mFtFace->glyph->advance.x);
91}
92
93void FreeTypeMinikinFontForTest::GetBounds(MinikinRect* bounds, uint32_t glyphId,
94                                           const MinikinPaint& paint,
95                                           const FontFakery& /* fakery */) const {
96    loadGlyphOrDie(glyphId, paint.size, mFtFace);
97
98    FT_BBox bbox;
99    FT_Outline_Get_CBox(&mFtFace->glyph->outline, &bbox);
100
101    bounds->mLeft = FTPosToFloat(bbox.xMin);
102    bounds->mTop = FTPosToFloat(bbox.yMax);
103    bounds->mRight = FTPosToFloat(bbox.xMax);
104    bounds->mBottom = FTPosToFloat(bbox.yMin);
105}
106
107void FreeTypeMinikinFontForTest::GetFontExtent(MinikinExtent* extent,
108                                               const MinikinPaint& /* paint */,
109                                               const FontFakery& /* fakery */) const {
110    // TODO: Retrieve font metrics from FreeType.
111    extent->ascent = -10.0f;
112    extent->descent = 20.0f;
113    extent->line_gap = 0.0f;
114}
115
116}  // namespace minikin
117