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wine/dlls/dwrite/opentype.c

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/*
* Methods for dealing with opentype font tables
*
* Copyright 2014 Aric Stewart for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define COBJMACROS
#include "dwrite.h"
#include "dwrite_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(dwrite);
#define MS_TTCF_TAG DWRITE_MAKE_OPENTYPE_TAG('t','t','c','f')
#define MS_OTTO_TAG DWRITE_MAKE_OPENTYPE_TAG('O','T','T','O')
#ifdef WORDS_BIGENDIAN
#define GET_BE_WORD(x) (x)
#define GET_BE_DWORD(x) (x)
#else
#define GET_BE_WORD(x) MAKEWORD(HIBYTE(x), LOBYTE(x))
#define GET_BE_DWORD(x) MAKELONG(GET_BE_WORD(HIWORD(x)), GET_BE_WORD(LOWORD(x)))
#endif
typedef struct {
CHAR TTCTag[4];
DWORD Version;
DWORD numFonts;
DWORD OffsetTable[1];
} TTC_Header_V1;
typedef struct {
DWORD version;
WORD numTables;
WORD searchRange;
WORD entrySelector;
WORD rangeShift;
} TTC_SFNT_V1;
typedef struct {
CHAR tag[4];
DWORD checkSum;
DWORD offset;
DWORD length;
} TT_TableRecord;
typedef struct {
WORD platformID;
WORD encodingID;
DWORD offset;
} CMAP_EncodingRecord;
typedef struct {
WORD version;
WORD numTables;
CMAP_EncodingRecord tables[1];
} CMAP_Header;
typedef struct {
DWORD startCharCode;
DWORD endCharCode;
DWORD startGlyphID;
} CMAP_SegmentedCoverage_group;
typedef struct {
WORD format;
WORD reserved;
DWORD length;
DWORD language;
DWORD nGroups;
CMAP_SegmentedCoverage_group groups[1];
} CMAP_SegmentedCoverage;
typedef struct {
WORD format;
WORD length;
WORD language;
WORD segCountX2;
WORD searchRange;
WORD entrySelector;
WORD rangeShift;
WORD endCode[1];
} CMAP_SegmentMapping_0;
/* PANOSE is 10 bytes in size, need to pack the structure properly */
#include "pshpack2.h"
typedef struct
{
ULONG version;
ULONG revision;
ULONG checksumadj;
ULONG magic;
USHORT flags;
USHORT unitsPerEm;
ULONGLONG created;
ULONGLONG modified;
SHORT xMin;
SHORT yMin;
SHORT xMax;
SHORT yMax;
USHORT macStyle;
USHORT lowestRecPPEM;
SHORT direction_hint;
SHORT index_format;
SHORT glyphdata_format;
} TT_HEAD;
typedef struct
{
ULONG Version;
ULONG italicAngle;
SHORT underlinePosition;
SHORT underlineThickness;
ULONG fixed_pitch;
ULONG minmemType42;
ULONG maxmemType42;
ULONG minmemType1;
ULONG maxmemType1;
} TT_POST;
typedef struct
{
USHORT version;
SHORT xAvgCharWidth;
USHORT usWeightClass;
USHORT usWidthClass;
SHORT fsType;
SHORT ySubscriptXSize;
SHORT ySubscriptYSize;
SHORT ySubscriptXOffset;
SHORT ySubscriptYOffset;
SHORT ySuperscriptXSize;
SHORT ySuperscriptYSize;
SHORT ySuperscriptXOffset;
SHORT ySuperscriptYOffset;
SHORT yStrikeoutSize;
SHORT yStrikeoutPosition;
SHORT sFamilyClass;
PANOSE panose;
ULONG ulUnicodeRange1;
ULONG ulUnicodeRange2;
ULONG ulUnicodeRange3;
ULONG ulUnicodeRange4;
CHAR achVendID[4];
USHORT fsSelection;
USHORT usFirstCharIndex;
USHORT usLastCharIndex;
/* According to the Apple spec, original version didn't have the below fields,
* version numbers were taken from the OpenType spec.
*/
/* version 0 (TrueType 1.5) */
USHORT sTypoAscender;
USHORT sTypoDescender;
USHORT sTypoLineGap;
USHORT usWinAscent;
USHORT usWinDescent;
/* version 1 (TrueType 1.66) */
ULONG ulCodePageRange1;
ULONG ulCodePageRange2;
/* version 2 (OpenType 1.2) */
SHORT sxHeight;
SHORT sCapHeight;
USHORT usDefaultChar;
USHORT usBreakChar;
USHORT usMaxContext;
} TT_OS2_V2;
#include "poppack.h"
HRESULT opentype_analyze_font(IDWriteFontFileStream *stream, UINT32* font_count, DWRITE_FONT_FILE_TYPE *file_type, DWRITE_FONT_FACE_TYPE *face_type, BOOL *supported)
{
/* TODO: Do font validation */
const void *font_data;
const char* tag;
void *context;
HRESULT hr;
hr = IDWriteFontFileStream_ReadFileFragment(stream, &font_data, 0, sizeof(TTC_Header_V1), &context);
if (FAILED(hr))
return hr;
tag = font_data;
*supported = FALSE;
*file_type = DWRITE_FONT_FILE_TYPE_UNKNOWN;
if (face_type)
*face_type = DWRITE_FONT_FACE_TYPE_UNKNOWN;
*font_count = 0;
if (DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]) == MS_TTCF_TAG)
{
const TTC_Header_V1 *header = font_data;
*font_count = GET_BE_DWORD(header->numFonts);
*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE_COLLECTION;
if (face_type)
*face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION;
*supported = TRUE;
}
else if (GET_BE_DWORD(*(DWORD*)font_data) == 0x10000)
{
*font_count = 1;
*file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE;
if (face_type)
*face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE;
*supported = TRUE;
}
else if (DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]) == MS_OTTO_TAG)
{
*file_type = DWRITE_FONT_FILE_TYPE_CFF;
}
IDWriteFontFileStream_ReleaseFileFragment(stream, context);
return S_OK;
}
HRESULT find_font_table(IDWriteFontFileStream *stream, UINT32 font_index, UINT32 tag, const void** table_data, void** table_context, UINT32 *table_size, BOOL* found)
{
const CHAR *first_data;
void *first_context;
HRESULT hr;
TTC_SFNT_V1 *font_header = NULL;
void *sfnt_context;
TT_TableRecord *table_record = NULL;
void *table_record_context;
int i;
int table_count;
int table_offset = 0;
*found = FALSE;
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&first_data, 0, 4, &first_context);
if (SUCCEEDED(hr))
{
if (DWRITE_MAKE_OPENTYPE_TAG(first_data[0], first_data[1], first_data[2], first_data[3]) == MS_TTCF_TAG)
{
const TTC_Header_V1 *ttc_header;
void * ttc_context;
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&ttc_header, 0, sizeof(*ttc_header), &ttc_context);
if (SUCCEEDED(hr))
{
table_offset = GET_BE_DWORD(ttc_header->OffsetTable[0]);
if (font_index >= GET_BE_DWORD(ttc_header->numFonts))
hr = E_INVALIDARG;
else
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&font_header, table_offset, sizeof(*font_header), &sfnt_context);
IDWriteFontFileStream_ReleaseFileFragment(stream, ttc_context);
}
}
else
{
if (font_index > 0)
hr = E_INVALIDARG;
else
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&font_header, 0, sizeof(*font_header), &sfnt_context);
}
IDWriteFontFileStream_ReleaseFileFragment(stream, first_context);
}
if (FAILED(hr))
return hr;
table_count = GET_BE_WORD(font_header->numTables);
table_offset += sizeof(*font_header);
for (i = 0; i < table_count; i++)
{
hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&table_record, table_offset, sizeof(*table_record), &table_record_context);
if (FAILED(hr))
break;
if (DWRITE_MAKE_OPENTYPE_TAG(table_record->tag[0], table_record->tag[1], table_record->tag[2], table_record->tag[3]) == tag)
break;
IDWriteFontFileStream_ReleaseFileFragment(stream, table_record_context);
table_offset += sizeof(*table_record);
}
IDWriteFontFileStream_ReleaseFileFragment(stream, sfnt_context);
if (SUCCEEDED(hr) && i < table_count)
{
int offset = GET_BE_DWORD(table_record->offset);
int length = GET_BE_DWORD(table_record->length);
IDWriteFontFileStream_ReleaseFileFragment(stream, table_record_context);
*found = TRUE;
*table_size = length;
hr = IDWriteFontFileStream_ReadFileFragment(stream, table_data, offset, length, table_context);
}
return hr;
}
/**********
* CMAP
**********/
static int compare_group(const void *a, const void* b)
{
const DWORD *chr = a;
const CMAP_SegmentedCoverage_group *group = b;
if (*chr < GET_BE_DWORD(group->startCharCode))
return -1;
if (*chr > GET_BE_DWORD(group->endCharCode))
return 1;
return 0;
}
static void CMAP4_GetGlyphIndex(CMAP_SegmentMapping_0* format, DWORD utf32c, LPWORD pgi)
{
WORD *startCode;
SHORT *idDelta;
WORD *idRangeOffset;
int segment;
int segment_count = GET_BE_WORD(format->segCountX2)/2;
/* This is correct because of the padding before startCode */
startCode = (WORD*)((BYTE*)format + sizeof(CMAP_SegmentMapping_0) + (sizeof(WORD) * segment_count));
idDelta = (SHORT*)(((BYTE*)startCode) + (sizeof(WORD) * segment_count));
idRangeOffset = (WORD*)(((BYTE*)idDelta) + (sizeof(WORD) * segment_count));
segment = 0;
while(GET_BE_WORD(format->endCode[segment]) < 0xffff)
{
if (utf32c <= GET_BE_WORD(format->endCode[segment]))
break;
segment++;
}
if (segment >= segment_count)
return;
TRACE("Segment %i of %i\n",segment, segment_count);
if (GET_BE_WORD(startCode[segment]) > utf32c)
return;
TRACE("In range %i -> %i\n", GET_BE_WORD(startCode[segment]), GET_BE_WORD(format->endCode[segment]));
if (GET_BE_WORD(idRangeOffset[segment]) == 0)
{
*pgi = (SHORT)(GET_BE_WORD(idDelta[segment])) + utf32c;
}
else
{
WORD ro = GET_BE_WORD(idRangeOffset[segment])/2;
WORD co = (utf32c - GET_BE_WORD(startCode[segment]));
WORD *index = (WORD*)((BYTE*)&idRangeOffset[segment] + (ro + co));
*pgi = GET_BE_WORD(*index);
}
}
static void CMAP12_GetGlyphIndex(CMAP_SegmentedCoverage* format, DWORD utf32c, LPWORD pgi)
{
CMAP_SegmentedCoverage_group *group = NULL;
group = bsearch(&utf32c, format->groups, GET_BE_DWORD(format->nGroups),
sizeof(CMAP_SegmentedCoverage_group), compare_group);
if (group)
{
DWORD offset = utf32c - GET_BE_DWORD(group->startCharCode);
*pgi = GET_BE_DWORD(group->startGlyphID) + offset;
}
}
VOID OpenType_CMAP_GetGlyphIndex(LPVOID data, DWORD utf32c, LPWORD pgi, DWORD flags)
{
int i;
CMAP_Header *CMAP_Table = NULL;
if (flags & GGI_MARK_NONEXISTING_GLYPHS)
*pgi = 0xffff;
else
*pgi = 0;
CMAP_Table = data;
for (i = 0; i < GET_BE_WORD(CMAP_Table->numTables); i++)
{
WORD type;
WORD *table;
if (GET_BE_WORD(CMAP_Table->tables[i].platformID) != 3)
continue;
table = (WORD*)(((BYTE*)CMAP_Table) + GET_BE_DWORD(CMAP_Table->tables[i].offset));
type = GET_BE_WORD(*table);
TRACE("Type %i\n", type);
/* Break when we find a handled type */
switch(type)
{
case 4:
CMAP4_GetGlyphIndex((CMAP_SegmentMapping_0*) table, utf32c, pgi);
break;
case 12:
CMAP12_GetGlyphIndex((CMAP_SegmentedCoverage*) table, utf32c, pgi);
break;
default:
TRACE("Type %i unhandled.\n", type);
}
}
}
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)
{
TT_OS2_V2 *tt_os2 = (TT_OS2_V2*)os2;
TT_HEAD *tt_head = (TT_HEAD*)head;
TT_POST *tt_post = (TT_POST*)post;
/* default stretch, weight and style to normal */
*stretch = DWRITE_FONT_STRETCH_NORMAL;
*weight = DWRITE_FONT_WEIGHT_NORMAL;
*style = DWRITE_FONT_STYLE_NORMAL;
memset(metrics, 0, sizeof(*metrics));
/* DWRITE_FONT_STRETCH enumeration values directly match font data values */
if (tt_os2)
{
if (GET_BE_WORD(tt_os2->usWidthClass) <= DWRITE_FONT_STRETCH_ULTRA_EXPANDED)
*stretch = GET_BE_WORD(tt_os2->usWidthClass);
*weight = GET_BE_WORD(tt_os2->usWeightClass);
TRACE("stretch=%d, weight=%d\n", *stretch, *weight);
metrics->ascent = GET_BE_WORD(tt_os2->sTypoAscender);
metrics->descent = GET_BE_WORD(tt_os2->sTypoDescender);
metrics->lineGap = GET_BE_WORD(tt_os2->sTypoLineGap);
metrics->capHeight = GET_BE_WORD(tt_os2->sCapHeight);
metrics->xHeight = GET_BE_WORD(tt_os2->sxHeight);
metrics->strikethroughPosition = GET_BE_WORD(tt_os2->yStrikeoutPosition);
metrics->strikethroughThickness = GET_BE_WORD(tt_os2->yStrikeoutSize);
}
if (tt_head)
{
USHORT macStyle = GET_BE_WORD(tt_head->macStyle);
metrics->designUnitsPerEm = GET_BE_WORD(tt_head->unitsPerEm);
if (macStyle & 0x0002)
*style = DWRITE_FONT_STYLE_ITALIC;
}
if (tt_post)
{
metrics->underlinePosition = GET_BE_WORD(tt_post->underlinePosition);
metrics->underlineThickness = GET_BE_WORD(tt_post->underlineThickness);
}
}
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