Aegisub/build/freetype2/ftsystem.cpp
Thomas Goyne b8f20dfe49 Add a custom stream IO implementation for Freetype
Freetype expects its IO to perform like mmap (i.e. seeking to be free),
but the non-unix implementation uses fseek and fread. This
implementation simply reads the entire file into a buffer, as fonts
generally aren't very big.

Cuts the time to recreate the fontconfig cache on my machine by about
60%.
2014-06-26 16:50:54 -07:00

75 lines
2.5 KiB
C++

// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
// The non-unix version of ftsystem.c uses stdio functions, but freetype uses
// streams as if they had mmap's performance characteristics (as it uses mmap
// on unix), which results in mind-blowingly poor performance (35%+ of the
// fontconfig caching runtime is spent on fseek).
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include <codecvt>
#include <fstream>
extern "C" FT_Error FT_Stream_Open(FT_Stream stream, const char *filepathname) {
if (!stream)
return FT_THROW(Invalid_Stream_Handle);
stream->descriptor.pointer = nullptr;
stream->pathname.pointer = const_cast<char *>(filepathname);
stream->base = nullptr;
stream->pos = 0;
stream->read = nullptr;
stream->close = nullptr;
std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter;
std::ifstream file(converter.from_bytes(filepathname), std::ios::binary);
if (!file.good())
return FT_THROW(Cannot_Open_Resource);
file.seekg(0, std::ios::end);
stream->size = (unsigned long)file.tellg();
if (!stream->size)
return FT_THROW(Cannot_Open_Stream);
file.seekg(0, std::ios::beg);
stream->base = (unsigned char *)malloc(stream->size);
file.read((char *)stream->base, stream->size);
stream->close = [](FT_Stream stream) {
free(stream->base);
stream->size = 0;
stream->base = nullptr;
};
return FT_Err_Ok;
}
extern "C" FT_Memory FT_New_Memory() {
return new FT_MemoryRec_{
nullptr,
[](FT_Memory, long size) { return malloc(size); },
[](FT_Memory, void *ptr) { free(ptr); },
[](FT_Memory, long, long size, void *ptr) { return realloc(ptr, size); }};
}
extern "C" void FT_Done_Memory(FT_Memory memory) {
delete memory;
}