448 lines
13 KiB
C
448 lines
13 KiB
C
/*
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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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typedef struct {
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DWORD version;
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WORD numTables;
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WORD searchRange;
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WORD entrySelector;
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WORD rangeShift;
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} TTC_SFNT_V1;
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typedef struct {
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CHAR tag[4];
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DWORD checkSum;
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DWORD offset;
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DWORD length;
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} TT_TableRecord;
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typedef struct {
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WORD platformID;
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WORD encodingID;
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DWORD offset;
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} CMAP_EncodingRecord;
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typedef struct {
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WORD version;
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WORD numTables;
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CMAP_EncodingRecord tables[1];
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} CMAP_Header;
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typedef struct {
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DWORD startCharCode;
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DWORD endCharCode;
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DWORD startGlyphID;
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} CMAP_SegmentedCoverage_group;
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typedef struct {
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WORD format;
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WORD reserved;
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DWORD length;
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DWORD language;
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DWORD nGroups;
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CMAP_SegmentedCoverage_group groups[1];
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} CMAP_SegmentedCoverage;
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typedef struct {
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WORD format;
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WORD length;
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WORD language;
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WORD segCountX2;
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WORD searchRange;
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WORD entrySelector;
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WORD rangeShift;
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WORD endCode[1];
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} CMAP_SegmentMapping_0;
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/* PANOSE is 10 bytes in size, need to pack the structure properly */
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#include "pshpack2.h"
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typedef struct
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{
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ULONG version;
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ULONG revision;
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ULONG checksumadj;
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ULONG magic;
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USHORT flags;
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USHORT unitsPerEm;
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ULONGLONG created;
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ULONGLONG modified;
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SHORT xMin;
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SHORT yMin;
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SHORT xMax;
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SHORT yMax;
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USHORT macStyle;
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USHORT lowestRecPPEM;
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SHORT direction_hint;
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SHORT index_format;
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SHORT glyphdata_format;
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} TT_HEAD;
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typedef struct
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{
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ULONG Version;
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ULONG italicAngle;
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SHORT underlinePosition;
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SHORT underlineThickness;
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ULONG fixed_pitch;
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ULONG minmemType42;
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ULONG maxmemType42;
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ULONG minmemType1;
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ULONG maxmemType1;
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} TT_POST;
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typedef struct
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{
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USHORT version;
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SHORT xAvgCharWidth;
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USHORT usWeightClass;
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USHORT usWidthClass;
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SHORT fsType;
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SHORT ySubscriptXSize;
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SHORT ySubscriptYSize;
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SHORT ySubscriptXOffset;
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SHORT ySubscriptYOffset;
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SHORT ySuperscriptXSize;
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SHORT ySuperscriptYSize;
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SHORT ySuperscriptXOffset;
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SHORT ySuperscriptYOffset;
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SHORT yStrikeoutSize;
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SHORT yStrikeoutPosition;
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SHORT sFamilyClass;
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PANOSE panose;
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ULONG ulUnicodeRange1;
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ULONG ulUnicodeRange2;
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ULONG ulUnicodeRange3;
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ULONG ulUnicodeRange4;
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CHAR achVendID[4];
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USHORT fsSelection;
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USHORT usFirstCharIndex;
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USHORT usLastCharIndex;
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/* According to the Apple spec, original version didn't have the below fields,
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* version numbers were taken from the OpenType spec.
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*/
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/* version 0 (TrueType 1.5) */
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USHORT sTypoAscender;
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USHORT sTypoDescender;
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USHORT sTypoLineGap;
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USHORT usWinAscent;
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USHORT usWinDescent;
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/* version 1 (TrueType 1.66) */
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ULONG ulCodePageRange1;
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ULONG ulCodePageRange2;
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/* version 2 (OpenType 1.2) */
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SHORT sxHeight;
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SHORT sCapHeight;
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USHORT usDefaultChar;
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USHORT usBreakChar;
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USHORT usMaxContext;
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} TT_OS2_V2;
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#include "poppack.h"
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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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HRESULT find_font_table(IDWriteFontFileStream *stream, UINT32 font_index, UINT32 tag, const void** table_data, void** table_context, UINT32 *table_size, BOOL* found)
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{
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const CHAR *first_data;
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void *first_context;
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HRESULT hr;
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TTC_SFNT_V1 *font_header = NULL;
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void *sfnt_context;
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TT_TableRecord *table_record = NULL;
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void *table_record_context;
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int i;
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int table_count;
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int table_offset = 0;
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*found = FALSE;
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hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&first_data, 0, 4, &first_context);
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if (SUCCEEDED(hr))
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{
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if (DWRITE_MAKE_OPENTYPE_TAG(first_data[0], first_data[1], first_data[2], first_data[3]) == MS_TTCF_TAG)
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{
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const TTC_Header_V1 *ttc_header;
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void * ttc_context;
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hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&ttc_header, 0, sizeof(*ttc_header), &ttc_context);
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if (SUCCEEDED(hr))
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{
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table_offset = GET_BE_DWORD(ttc_header->OffsetTable[0]);
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if (font_index >= GET_BE_DWORD(ttc_header->numFonts))
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hr = E_INVALIDARG;
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else
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hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&font_header, table_offset, sizeof(*font_header), &sfnt_context);
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IDWriteFontFileStream_ReleaseFileFragment(stream, ttc_context);
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}
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}
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else
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{
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if (font_index > 0)
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hr = E_INVALIDARG;
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else
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hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&font_header, 0, sizeof(*font_header), &sfnt_context);
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}
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IDWriteFontFileStream_ReleaseFileFragment(stream, first_context);
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}
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if (FAILED(hr))
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return hr;
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table_count = GET_BE_WORD(font_header->numTables);
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table_offset += sizeof(*font_header);
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for (i = 0; i < table_count; i++)
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{
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hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&table_record, table_offset, sizeof(*table_record), &table_record_context);
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if (FAILED(hr))
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break;
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if (DWRITE_MAKE_OPENTYPE_TAG(table_record->tag[0], table_record->tag[1], table_record->tag[2], table_record->tag[3]) == tag)
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break;
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IDWriteFontFileStream_ReleaseFileFragment(stream, table_record_context);
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table_offset += sizeof(*table_record);
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}
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IDWriteFontFileStream_ReleaseFileFragment(stream, sfnt_context);
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if (SUCCEEDED(hr) && i < table_count)
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{
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int offset = GET_BE_DWORD(table_record->offset);
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int length = GET_BE_DWORD(table_record->length);
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IDWriteFontFileStream_ReleaseFileFragment(stream, table_record_context);
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*found = TRUE;
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*table_size = length;
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hr = IDWriteFontFileStream_ReadFileFragment(stream, table_data, offset, length, table_context);
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}
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return hr;
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}
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/**********
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* CMAP
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**********/
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static int compare_group(const void *a, const void* b)
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{
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const DWORD *chr = a;
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const CMAP_SegmentedCoverage_group *group = b;
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if (*chr < GET_BE_DWORD(group->startCharCode))
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return -1;
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if (*chr > GET_BE_DWORD(group->endCharCode))
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return 1;
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return 0;
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}
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static void CMAP4_GetGlyphIndex(CMAP_SegmentMapping_0* format, DWORD utf32c, LPWORD pgi)
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{
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WORD *startCode;
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SHORT *idDelta;
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WORD *idRangeOffset;
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int segment;
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int segment_count = GET_BE_WORD(format->segCountX2)/2;
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/* This is correct because of the padding before startCode */
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startCode = (WORD*)((BYTE*)format + sizeof(CMAP_SegmentMapping_0) + (sizeof(WORD) * segment_count));
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idDelta = (SHORT*)(((BYTE*)startCode) + (sizeof(WORD) * segment_count));
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idRangeOffset = (WORD*)(((BYTE*)idDelta) + (sizeof(WORD) * segment_count));
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segment = 0;
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while(GET_BE_WORD(format->endCode[segment]) < 0xffff)
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{
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if (utf32c <= GET_BE_WORD(format->endCode[segment]))
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break;
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segment++;
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}
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if (segment >= segment_count)
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return;
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TRACE("Segment %i of %i\n",segment, segment_count);
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if (GET_BE_WORD(startCode[segment]) > utf32c)
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return;
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TRACE("In range %i -> %i\n", GET_BE_WORD(startCode[segment]), GET_BE_WORD(format->endCode[segment]));
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if (GET_BE_WORD(idRangeOffset[segment]) == 0)
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{
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*pgi = (SHORT)(GET_BE_WORD(idDelta[segment])) + utf32c;
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}
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else
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{
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WORD ro = GET_BE_WORD(idRangeOffset[segment])/2;
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WORD co = (utf32c - GET_BE_WORD(startCode[segment]));
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WORD *index = (WORD*)((BYTE*)&idRangeOffset[segment] + (ro + co));
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*pgi = GET_BE_WORD(*index);
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}
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}
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static void CMAP12_GetGlyphIndex(CMAP_SegmentedCoverage* format, DWORD utf32c, LPWORD pgi)
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{
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CMAP_SegmentedCoverage_group *group = NULL;
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group = bsearch(&utf32c, format->groups, GET_BE_DWORD(format->nGroups),
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sizeof(CMAP_SegmentedCoverage_group), compare_group);
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if (group)
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{
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DWORD offset = utf32c - GET_BE_DWORD(group->startCharCode);
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*pgi = GET_BE_DWORD(group->startGlyphID) + offset;
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}
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}
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VOID OpenType_CMAP_GetGlyphIndex(LPVOID data, DWORD utf32c, LPWORD pgi, DWORD flags)
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{
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int i;
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CMAP_Header *CMAP_Table = NULL;
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if (flags & GGI_MARK_NONEXISTING_GLYPHS)
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*pgi = 0xffff;
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else
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*pgi = 0;
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CMAP_Table = data;
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for (i = 0; i < GET_BE_WORD(CMAP_Table->numTables); i++)
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{
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WORD type;
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WORD *table;
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if (GET_BE_WORD(CMAP_Table->tables[i].platformID) != 3)
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continue;
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table = (WORD*)(((BYTE*)CMAP_Table) + GET_BE_DWORD(CMAP_Table->tables[i].offset));
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type = GET_BE_WORD(*table);
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TRACE("Type %i\n", type);
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/* Break when we find a handled type */
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switch(type)
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{
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case 4:
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CMAP4_GetGlyphIndex((CMAP_SegmentMapping_0*) table, utf32c, pgi);
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break;
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case 12:
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CMAP12_GetGlyphIndex((CMAP_SegmentedCoverage*) table, utf32c, pgi);
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break;
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default:
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TRACE("Type %i unhandled.\n", type);
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}
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}
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}
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VOID get_font_properties(LPCVOID os2, LPCVOID head, LPCVOID post, DWRITE_FONT_METRICS *metrics, DWRITE_FONT_STRETCH *stretch, DWRITE_FONT_WEIGHT *weight, DWRITE_FONT_STYLE *style)
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{
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TT_OS2_V2 *tt_os2 = (TT_OS2_V2*)os2;
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TT_HEAD *tt_head = (TT_HEAD*)head;
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TT_POST *tt_post = (TT_POST*)post;
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/* default stretch, weight and style to normal */
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*stretch = DWRITE_FONT_STRETCH_NORMAL;
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*weight = DWRITE_FONT_WEIGHT_NORMAL;
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*style = DWRITE_FONT_STYLE_NORMAL;
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memset(metrics, 0, sizeof(*metrics));
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/* DWRITE_FONT_STRETCH enumeration values directly match font data values */
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if (tt_os2)
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{
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if (GET_BE_WORD(tt_os2->usWidthClass) <= DWRITE_FONT_STRETCH_ULTRA_EXPANDED)
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*stretch = GET_BE_WORD(tt_os2->usWidthClass);
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*weight = GET_BE_WORD(tt_os2->usWeightClass);
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TRACE("stretch=%d, weight=%d\n", *stretch, *weight);
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metrics->ascent = GET_BE_WORD(tt_os2->sTypoAscender);
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metrics->descent = GET_BE_WORD(tt_os2->sTypoDescender);
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metrics->lineGap = GET_BE_WORD(tt_os2->sTypoLineGap);
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metrics->capHeight = GET_BE_WORD(tt_os2->sCapHeight);
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metrics->xHeight = GET_BE_WORD(tt_os2->sxHeight);
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metrics->strikethroughPosition = GET_BE_WORD(tt_os2->yStrikeoutPosition);
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metrics->strikethroughThickness = GET_BE_WORD(tt_os2->yStrikeoutSize);
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}
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if (tt_head)
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{
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USHORT macStyle = GET_BE_WORD(tt_head->macStyle);
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metrics->designUnitsPerEm = GET_BE_WORD(tt_head->unitsPerEm);
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if (macStyle & 0x0002)
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*style = DWRITE_FONT_STYLE_ITALIC;
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}
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if (tt_post)
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{
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metrics->underlinePosition = GET_BE_WORD(tt_post->underlinePosition);
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metrics->underlineThickness = GET_BE_WORD(tt_post->underlineThickness);
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}
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}
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