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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "Minikin"
#include "FreeTypeMinikinFontForTest.h"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <ft2build.h>
#include <log/log.h>
#include FT_OUTLINE_H
#include "minikin/MinikinExtent.h"
#include "minikin/MinikinFont.h"
#include "minikin/MinikinPaint.h"
#include "minikin/MinikinRect.h"
namespace minikin {
namespace {
constexpr FT_Int32 LOAD_FLAG =
FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
constexpr float FTPosToFloat(FT_Pos x) {
return x / 64.0;
}
constexpr FT_F26Dot6 FTFloatToF26Dot6(float x) {
return static_cast<FT_F26Dot6>(x * 64);
}
void loadGlyphOrDie(uint32_t glyphId, float size, FT_Face face) {
const FT_F26Dot6 scale = FTFloatToF26Dot6(size);
LOG_ALWAYS_FATAL_IF(FT_Set_Char_Size(face, scale, scale, 72 /* dpi */, 72 /* dpi */),
"Failed to set character size.");
LOG_ALWAYS_FATAL_IF(FT_Load_Glyph(face, glyphId, LOAD_FLAG), "Failed to load glyph");
LOG_ALWAYS_FATAL_IF(face->glyph->format != FT_GLYPH_FORMAT_OUTLINE,
"Only outline font is supported.");
}
} // namespace
FreeTypeMinikinFontForTest::FreeTypeMinikinFontForTest(const std::string& font_path, int index)
: mFontPath(font_path), mFontIndex(index) {
int fd = open(font_path.c_str(), O_RDONLY);
LOG_ALWAYS_FATAL_IF(fd == -1, "Open failed: %s", font_path.c_str());
struct stat st = {};
LOG_ALWAYS_FATAL_IF(fstat(fd, &st) != 0);
mFontSize = st.st_size;
mFontData = mmap(NULL, mFontSize, PROT_READ, MAP_SHARED, fd, 0);
LOG_ALWAYS_FATAL_IF(mFontData == nullptr);
close(fd);
LOG_ALWAYS_FATAL_IF(FT_Init_FreeType(&mFtLibrary), "Failed to initialize FreeType");
FT_Open_Args args;
args.flags = FT_OPEN_MEMORY;
args.memory_base = static_cast<const FT_Byte*>(mFontData);
args.memory_size = mFontSize;
LOG_ALWAYS_FATAL_IF(FT_Open_Face(mFtLibrary, &args, index, &mFtFace), "Failed to open FT_Face");
}
FreeTypeMinikinFontForTest::~FreeTypeMinikinFontForTest() {
FT_Done_Face(mFtFace);
FT_Done_FreeType(mFtLibrary);
munmap(mFontData, mFontSize);
}
float FreeTypeMinikinFontForTest::GetHorizontalAdvance(uint32_t glyphId, const MinikinPaint& paint,
const FontFakery& /* fakery */) const {
loadGlyphOrDie(glyphId, paint.size, mFtFace);
return FTPosToFloat(mFtFace->glyph->advance.x);
}
void FreeTypeMinikinFontForTest::GetBounds(MinikinRect* bounds, uint32_t glyphId,
const MinikinPaint& paint,
const FontFakery& /* fakery */) const {
loadGlyphOrDie(glyphId, paint.size, mFtFace);
FT_BBox bbox;
FT_Outline_Get_CBox(&mFtFace->glyph->outline, &bbox);
bounds->mLeft = FTPosToFloat(bbox.xMin);
bounds->mTop = FTPosToFloat(bbox.yMax);
bounds->mRight = FTPosToFloat(bbox.xMax);
bounds->mBottom = FTPosToFloat(bbox.yMin);
}
void FreeTypeMinikinFontForTest::GetFontExtent(MinikinExtent* extent, const MinikinPaint& paint,
const FontFakery& /* fakery */) const {
float upem = mFtFace->units_per_EM;
extent->ascent = -static_cast<float>(mFtFace->ascender) * paint.size / upem;
extent->descent = -static_cast<float>(mFtFace->descender) * paint.size / upem;
}
FreeTypeMinikinFontForTestFactory::FreeTypeMinikinFontForTestFactory() : MinikinFontFactory() {
MinikinFontFactory::setInstance(this);
}
// static
void FreeTypeMinikinFontForTestFactory::init() {
static FreeTypeMinikinFontForTestFactory factory;
}
void FreeTypeMinikinFontForTestFactory::write(BufferWriter* writer,
const MinikinFont* typeface) const {
writer->writeString(typeface->GetFontPath());
}
std::shared_ptr<MinikinFont> FreeTypeMinikinFontForTestFactory::create(BufferReader reader) const {
std::string fontPath(reader.readString());
return std::make_shared<FreeTypeMinikinFontForTest>(fontPath);
}
void FreeTypeMinikinFontForTestFactory::skip(BufferReader* reader) const {
reader->skipString(); // fontPath
}
} // namespace minikin
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