84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
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/*
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* Methods for dealing with opentype font tables
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*
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* Copyright 2014 Aric Stewart for CodeWeavers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#define COBJMACROS
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#include "dwrite.h"
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#include "dwrite_private.h"
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WINE_DEFAULT_DEBUG_CHANNEL(dwrite);
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#define DWRITE_MAKE_OPENTYPE_TAG(ch0, ch1, ch2, ch3) \
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((DWORD)(BYTE)(ch0) | ((DWORD)(BYTE)(ch1) << 8) | \
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((DWORD)(BYTE)(ch2) << 16) | ((DWORD)(BYTE)(ch3) << 24))
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#define MS_TTCF_TAG DWRITE_MAKE_OPENTYPE_TAG('t','t','c','f')
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#define MS_OTTO_TAG DWRITE_MAKE_OPENTYPE_TAG('O','T','T','O')
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#ifdef WORDS_BIGENDIAN
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#define GET_BE_WORD(x) (x)
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#define GET_BE_DWORD(x) (x)
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#else
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#define GET_BE_WORD(x) MAKEWORD(HIBYTE(x), LOBYTE(x))
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#define GET_BE_DWORD(x) MAKELONG(GET_BE_WORD(HIWORD(x)), GET_BE_WORD(LOWORD(x)))
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#endif
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typedef struct {
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CHAR TTCTag[4];
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DWORD Version;
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DWORD numFonts;
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DWORD OffsetTable[1];
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} TTC_Header_V1;
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HRESULT analyze_opentype_font(const void* font_data, UINT32* font_count, DWRITE_FONT_FILE_TYPE *file_type, DWRITE_FONT_FACE_TYPE *face_type, BOOL *supported)
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{
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/* TODO: Do font validation */
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const char* tag = font_data;
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*supported = FALSE;
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*file_type = DWRITE_FONT_FILE_TYPE_UNKNOWN;
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if (face_type)
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*face_type = DWRITE_FONT_FACE_TYPE_UNKNOWN;
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*font_count = 0;
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if (DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]) == MS_TTCF_TAG)
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{
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const TTC_Header_V1 *header = font_data;
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*font_count = GET_BE_DWORD(header->numFonts);
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*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE_COLLECTION;
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if (face_type)
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*face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION;
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*supported = TRUE;
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}
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else if (GET_BE_DWORD(*(DWORD*)font_data) == 0x10000)
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{
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*font_count = 1;
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*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE;
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if (face_type)
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*face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE;
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*supported = TRUE;
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}
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else if (DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]) == MS_OTTO_TAG)
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{
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*file_type = DWRITE_FONT_FILE_TYPE_CFF;
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}
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return S_OK;
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}
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