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wine/dlls/wineps.drv/truetype.c
André Hentschel 5038c2c286 wineps.drv: Update comments.
2010-06-25 10:25:04 +02:00

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/*******************************************************************************
* TrueType font-related functions for Wine PostScript driver. Currently just
* uses FreeType to read font metrics.
*
* Copyright 2001 Ian Pilcher
*
* 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
*
* NOTE: Many of the functions in this file can return either fatal errors
* (memory allocation failure or unexpected FreeType error) or non-fatal
* errors (unusable font file). Fatal errors are indicated by returning
* FALSE; see individual function descriptions for how they indicate non-
* fatal errors.
*
*/
#include "config.h"
#include "wine/port.h"
#ifdef HAVE_FREETYPE
/*
* These stupid #ifdefs should work for FreeType 2.0.1 and 2.0.2. Beyond that
* is anybody's guess.
*/
#ifdef HAVE_FT2BUILD_H
#include <ft2build.h>
#endif
#ifdef HAVE_FREETYPE_FREETYPE_H
#include <freetype/freetype.h>
#endif
#ifdef HAVE_FREETYPE_FTGLYPH_H
#include <freetype/ftglyph.h>
#endif
#ifdef HAVE_FREETYPE_TTTABLES_H
#include <freetype/tttables.h>
#endif
#ifdef HAVE_FREETYPE_FTSNAMES_H
#include <freetype/ftsnames.h>
#endif
#ifdef HAVE_FREETYPE_TTNAMEID_H
#include <freetype/ttnameid.h>
#endif
#include <sys/types.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#endif
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "winreg.h"
#include "winnls.h"
#include "psdrv.h"
#include "wine/library.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(psdrv);
#define REQUIRED_FACE_FLAGS ( FT_FACE_FLAG_SCALABLE | \
FT_FACE_FLAG_HORIZONTAL | \
FT_FACE_FLAG_SFNT | \
FT_FACE_FLAG_GLYPH_NAMES )
#define GLYPH_LOAD_FLAGS ( FT_LOAD_NO_SCALE | \
FT_LOAD_IGNORE_TRANSFORM | \
FT_LOAD_LINEAR_DESIGN )
static void *ft_handle = NULL;
#define MAKE_FUNCPTR(f) static typeof(f) * p##f = NULL;
MAKE_FUNCPTR(FT_Done_Face)
MAKE_FUNCPTR(FT_Done_FreeType)
MAKE_FUNCPTR(FT_Get_Char_Index)
MAKE_FUNCPTR(FT_Get_Glyph_Name)
MAKE_FUNCPTR(FT_Get_Sfnt_Name)
MAKE_FUNCPTR(FT_Get_Sfnt_Name_Count)
MAKE_FUNCPTR(FT_Get_Sfnt_Table)
MAKE_FUNCPTR(FT_Init_FreeType)
MAKE_FUNCPTR(FT_Load_Glyph)
MAKE_FUNCPTR(FT_New_Face)
MAKE_FUNCPTR(FT_Set_Charmap)
#undef MAKE_FUNCPTR
/*******************************************************************************
* FindCharMap
*
* Finds Windows character map and creates "EncodingScheme" string. Returns
* FALSE to indicate memory allocation or FreeType error; sets *p_charmap to
* NULL if no Windows encoding is present.
*
* Returns Unicode character map if present; otherwise uses the first Windows
* character map found.
*
*/
static const LPCSTR encoding_names[7] =
{
"WindowsSymbol", /* TT_MS_ID_SYMBOL_CS */
"WindowsUnicode", /* TT_MS_ID_UNICODE_CS */
"WindowsShiftJIS", /* TT_MS_ID_SJIS */
"WindowsPRC", /* TT_MS_ID_GB2312 */
"WindowsBig5", /* TT_MS_ID_BIG_5 */
"WindowsWansung", /* TT_MS_ID_WANSUNG */
"WindowsJohab" /* TT_MS_ID_JOHAB */
/* "WindowsUnknown65535" is the longest possible (encoding_id is a UShort) */
};
static BOOL FindCharMap(FT_Face face, FT_CharMap *p_charmap, LPSTR *p_sz)
{
FT_Int i;
FT_Error error;
FT_CharMap charmap = NULL;
for (i = 0; i < face->num_charmaps; ++i)
{
if (face->charmaps[i]->platform_id != TT_PLATFORM_MICROSOFT)
continue;
if (face->charmaps[i]->encoding_id == TT_MS_ID_UNICODE_CS)
{
charmap = face->charmaps[i];
break;
}
if (charmap == NULL)
charmap = face->charmaps[i];
}
*p_charmap = charmap;
if (charmap == NULL)
{
WARN("No Windows character map found\n");
return TRUE;
}
error = pFT_Set_Charmap(face, charmap);
if (error != FT_Err_Ok)
{
ERR("%s returned %i\n", "FT_Set_Charmap", error);
return FALSE;
}
*p_sz = HeapAlloc(PSDRV_Heap, 0, sizeof("WindowsUnknown65535"));
if (*p_sz == NULL)
return FALSE;
if (charmap->encoding_id < 7)
strcpy(*p_sz, encoding_names[charmap->encoding_id]);
else
sprintf(*p_sz, "%s%u", "WindowsUnknown", charmap->encoding_id);
return TRUE;
}
/*******************************************************************************
* MSTTStrToSz
*
* Converts a string in the TrueType NAME table to a null-terminated ASCII
* character string. Space for the string is allocated from the driver heap.
* Only handles platform_id = 3 (TT_PLATFORM_MICROSOFT) strings (16-bit, big
* endian). It also only handles ASCII character codes (< 128).
*
* Sets *p_sz to NULL if string cannot be converted; only returns FALSE for
* memory allocation failure.
*
*/
static BOOL MSTTStrToSz(const FT_SfntName *name, LPSTR *p_sz)
{
FT_UShort i;
INT len;
BYTE *wsz;
LPSTR sz;
len = name->string_len / 2; /* # of 16-bit chars */
*p_sz = sz = HeapAlloc(PSDRV_Heap, 0, len + 1);
if (sz == NULL)
return FALSE;
wsz = (BYTE *)name->string;
for (i = 0; i < len; ++i, ++sz)
{
USHORT wc = (wsz[0] << 8) + wsz[1];
wsz += 2;
if (wc > 127)
{
WARN("Non-ASCII character 0x%.4x\n", wc);
HeapFree(PSDRV_Heap, 0, *p_sz);
*p_sz = NULL;
return TRUE;
}
*sz = (CHAR)wc;
}
*sz = '\0';
return TRUE;
}
/*******************************************************************************
* FindMSTTString
*
* Finds the requested Microsoft platform string in the TrueType NAME table and
* converts it to a null-terminated ASCII string. Currently looks for U.S.
* English names only.
*
* Sets string to NULL if not present or cannot be converted; returns FALSE
* only for memory allocation failure.
*
*/
static BOOL FindMSTTString(FT_Face face, FT_CharMap charmap, FT_UShort name_id,
LPSTR *p_sz)
{
FT_UInt num_strings, string_index;
FT_SfntName name;
FT_Error error;
num_strings = pFT_Get_Sfnt_Name_Count(face);
for (string_index = 0; string_index < num_strings; ++string_index)
{
error = pFT_Get_Sfnt_Name(face, string_index, &name);
if (error != FT_Err_Ok)
{
ERR("%s returned %i\n", "FT_Get_Sfnt_Name", error);
return FALSE;
}
/* FIXME - Handle other languages? */
if (name.platform_id != TT_PLATFORM_MICROSOFT ||
name.language_id != TT_MS_LANGID_ENGLISH_UNITED_STATES)
continue;
if (name.platform_id != charmap->platform_id ||
name.encoding_id != charmap->encoding_id)
continue;
if (name.name_id != name_id)
continue;
return MSTTStrToSz(&name, p_sz);
}
*p_sz = NULL; /* didn't find it */
return TRUE;
}
/*******************************************************************************
* PSUnits
*
* Convert TrueType font units (relative to font em square) to PostScript
* units.
*
*/
static inline float PSUnits(LONG x, USHORT em_size)
{
return 1000.0 * (float)x / (float)em_size;
}
/*******************************************************************************
* StartAFM
*
* Allocates space for the AFM on the driver heap and reads basic font metrics
* from the HEAD, POST, HHEA, and OS/2 tables. Returns FALSE for memory
* allocation error; sets *p_afm to NULL if required information is missing.
*
*/
static BOOL StartAFM(FT_Face face, AFM **p_afm)
{
TT_Header *head;
TT_Postscript *post;
TT_OS2 *os2;
TT_HoriHeader *hhea;
USHORT em_size;
AFM *afm;
head = pFT_Get_Sfnt_Table(face, ft_sfnt_head);
post = pFT_Get_Sfnt_Table(face, ft_sfnt_post);
os2 = pFT_Get_Sfnt_Table(face, ft_sfnt_os2);
hhea = pFT_Get_Sfnt_Table(face, ft_sfnt_hhea);
if (head == NULL || post == NULL || os2 == NULL || hhea == NULL ||
os2->version == 0xffff) /* old Macintosh font */
{
WARN("Required table(s) missing\n");
*p_afm = NULL;
return TRUE;
}
*p_afm = afm = HeapAlloc(PSDRV_Heap, 0, sizeof(*afm));
if (afm == NULL)
return FALSE;
afm->WinMetrics.usUnitsPerEm = em_size = head->Units_Per_EM;
afm->WinMetrics.sAscender = hhea->Ascender;
afm->WinMetrics.sDescender = hhea->Descender;
afm->WinMetrics.sLineGap = hhea->Line_Gap;
afm->WinMetrics.sTypoAscender = os2->sTypoAscender;
afm->WinMetrics.sTypoDescender = os2->sTypoDescender;
afm->WinMetrics.sTypoLineGap = os2->sTypoLineGap;
afm->WinMetrics.usWinAscent = os2->usWinAscent;
afm->WinMetrics.usWinDescent = os2->usWinDescent;
afm->WinMetrics.sAvgCharWidth = os2->xAvgCharWidth;
afm->Weight = os2->usWeightClass;
afm->ItalicAngle = ((float)(post->italicAngle)) / 65536.0;
afm->IsFixedPitch = (post-> isFixedPitch == 0) ? FALSE : TRUE;
afm->UnderlinePosition = PSUnits(post->underlinePosition, em_size);
afm->UnderlineThickness = PSUnits(post->underlineThickness, em_size);
afm->FontBBox.llx = PSUnits(head->xMin, em_size);
afm->FontBBox.lly = PSUnits(head->yMin, em_size);
afm->FontBBox.urx = PSUnits(head->xMax, em_size);
afm->FontBBox.ury = PSUnits(head->yMax, em_size);
afm->Ascender = PSUnits(os2->sTypoAscender, em_size);
afm->Descender = PSUnits(os2->sTypoDescender, em_size);
return TRUE;
}
/*******************************************************************************
* ReadCharMetrics
*
* Reads metrics for each glyph in a TrueType font. Returns false for memory
* allocation or FreeType error; sets *p_metrics to NULL for non-fatal error.
*
*/
static BOOL ReadCharMetrics(FT_Face face, AFM *afm, AFMMETRICS **p_metrics)
{
FT_ULong charcode, index;
AFMMETRICS *metrics;
USHORT em_size = afm->WinMetrics.usUnitsPerEm;
for (charcode = 0, index = 0; charcode < 65536; ++charcode)
if (pFT_Get_Char_Index(face, charcode) != 0)
++index; /* count # of glyphs */
afm->NumofMetrics = index;
*p_metrics = metrics = HeapAlloc(PSDRV_Heap, 0, index * sizeof(*metrics));
if (metrics == NULL)
return FALSE;
for (charcode = 0, index = 0; charcode < 65536; ++charcode)
{
FT_UInt glyph_index = pFT_Get_Char_Index(face, charcode);
FT_Error error;
CHAR buffer[128]; /* for glyph names */
if (glyph_index == 0)
continue;
error = pFT_Load_Glyph(face, glyph_index, GLYPH_LOAD_FLAGS);
if (error != FT_Err_Ok)
{
ERR("%s returned %i\n", "FT_Load_Glyph", error);
goto cleanup;
}
error = pFT_Get_Glyph_Name(face, glyph_index, buffer, sizeof(buffer));
if (error != FT_Err_Ok)
{
ERR("%s returned %i\n", "FT_Get_Glyph_Name", error);
goto cleanup;
}
metrics[index].N = PSDRV_GlyphName(buffer);
if (metrics[index].N == NULL)
goto cleanup;
metrics[index].C = metrics[index].UV = charcode;
metrics[index].WX = PSUnits(face->glyph->metrics.horiAdvance, em_size);
++index;
}
if (afm->WinMetrics.sAvgCharWidth == 0)
afm->WinMetrics.sAvgCharWidth = PSDRV_CalcAvgCharWidth(afm);
return TRUE;
cleanup:
HeapFree(PSDRV_Heap, 0, metrics);
return FALSE;
}
/*******************************************************************************
* BuildTrueTypeAFM
*
* Builds the AFM for a TrueType font and adds it to the driver font list.
* Returns FALSE only on an unexpected error (memory allocation failure or
* FreeType error).
*
*/
static BOOL BuildTrueTypeAFM(FT_Face face)
{
AFM *afm;
AFMMETRICS *metrics;
LPSTR font_name, full_name, family_name, encoding_scheme = NULL;
FT_CharMap charmap;
BOOL retval, added;
retval = StartAFM(face, &afm);
if (retval == FALSE || afm == NULL)
return retval;
retval = FindCharMap(face, &charmap, &encoding_scheme);
if (retval == FALSE || charmap == NULL)
goto cleanup_afm;
retval = FindMSTTString(face, charmap, TT_NAME_ID_PS_NAME, &font_name);
if (retval == FALSE || font_name == NULL)
goto cleanup_encoding_scheme;
retval = FindMSTTString(face, charmap, TT_NAME_ID_FULL_NAME, &full_name);
if (retval == FALSE || full_name == NULL)
goto cleanup_font_name;
retval = FindMSTTString(face, charmap, TT_NAME_ID_FONT_FAMILY,
&family_name);
if (retval == FALSE || family_name == NULL)
goto cleanup_full_name;
retval = ReadCharMetrics(face, afm, &metrics);
if (retval == FALSE || metrics == NULL)
goto cleanup_family_name;
afm->EncodingScheme = encoding_scheme; afm->FontName = font_name;
afm->FullName = full_name; afm->FamilyName = family_name;
afm->Metrics = metrics;
retval = PSDRV_AddAFMtoList(&PSDRV_AFMFontList, afm, &added);
if (retval == FALSE || added == FALSE)
goto cleanup_family_name;
return TRUE;
/* clean up after fatal or non-fatal errors */
cleanup_family_name:
HeapFree(PSDRV_Heap, 0, family_name);
cleanup_full_name:
HeapFree(PSDRV_Heap, 0, full_name);
cleanup_font_name:
HeapFree(PSDRV_Heap, 0, font_name);
cleanup_encoding_scheme:
HeapFree(PSDRV_Heap, 0, encoding_scheme);
cleanup_afm:
HeapFree(PSDRV_Heap, 0, afm);
return retval;
}
/*******************************************************************************
* ReadTrueTypeFile
*
* Reads font metrics from TrueType font file. Only returns FALSE for
* unexpected errors (memory allocation failure or FreeType error).
*
*/
static BOOL ReadTrueTypeFile(FT_Library library, LPCSTR filename)
{
FT_Error error;
FT_Face face;
TRACE("%s\n", filename);
error = pFT_New_Face(library, filename, 0, &face);
if (error != FT_Err_Ok)
{
WARN("FreeType error %i opening %s\n", error, filename);
return TRUE;
}
if ((face->face_flags & REQUIRED_FACE_FLAGS) == REQUIRED_FACE_FLAGS)
{
if (BuildTrueTypeAFM(face) == FALSE)
{
pFT_Done_Face(face);
return FALSE;
}
}
else
{
WARN("Required information missing from %s\n", filename);
}
error = pFT_Done_Face(face);
if (error != FT_Err_Ok)
{
ERR("%s returned %i\n", "FT_Done_Face", error);
return FALSE;
}
return TRUE;
}
/*******************************************************************************
* ReadTrueTypeDir
*
* Reads all TrueType font files in a directory.
*
*/
static BOOL ReadTrueTypeDir(FT_Library library, LPCSTR dirname)
{
struct dirent *dent;
DIR *dir;
CHAR filename[256];
dir = opendir(dirname);
if (dir == NULL)
{
WARN("'%s' opening %s\n", strerror(errno), dirname);
return TRUE;
}
while ((dent = readdir(dir)) != NULL)
{
CHAR *file_extension = strrchr(dent->d_name, '.');
int fn_len;
if (file_extension == NULL || strcasecmp(file_extension, ".ttf") != 0)
continue;
fn_len = snprintf(filename, 256, "%s/%s", dirname, dent->d_name);
if (fn_len < 0 || fn_len > sizeof(filename) - 1)
{
WARN("Path '%s/%s' is too long\n", dirname, dent->d_name);
continue;
}
if (ReadTrueTypeFile(library, filename) == FALSE)
{
closedir(dir);
return FALSE;
}
}
closedir(dir);
return TRUE;
}
/*******************************************************************************
* PSDRV_GetTrueTypeMetrics
*
* Reads font metrics from TrueType font files in directories listed in the
* HKEY_CURRENT_USER\\Software\\Wine\\Fonts\\Path registry string.
*
* If this function fails (returns FALSE), the driver will fail to initialize
* and the driver heap will be destroyed, so it's not necessary to HeapFree
* everything in that event.
*
*/
BOOL PSDRV_GetTrueTypeMetrics(void)
{
static const WCHAR pathW[] = {'P','a','t','h',0};
FT_Error error;
FT_Library library;
HKEY hkey;
DWORD len;
LPWSTR valueW;
LPSTR valueA, ptr;
/* @@ Wine registry key: HKCU\Software\Wine\Fonts */
if (RegOpenKeyA(HKEY_CURRENT_USER, "Software\\Wine\\Fonts", &hkey) != ERROR_SUCCESS)
return TRUE;
ft_handle = wine_dlopen(SONAME_LIBFREETYPE, RTLD_NOW, NULL, 0);
if(!ft_handle) {
WINE_MESSAGE(
"Wine cannot find the FreeType font library. To enable Wine to\n"
"use TrueType fonts please install a version of FreeType greater than\n"
"or equal to 2.0.5.\n"
"http://www.freetype.org\n");
RegCloseKey(hkey);
return TRUE;
}
#define LOAD_FUNCPTR(f) if((p##f = wine_dlsym(ft_handle, #f, NULL, 0)) == NULL) goto sym_not_found;
LOAD_FUNCPTR(FT_Done_Face)
LOAD_FUNCPTR(FT_Done_FreeType)
LOAD_FUNCPTR(FT_Get_Char_Index)
LOAD_FUNCPTR(FT_Get_Glyph_Name)
LOAD_FUNCPTR(FT_Get_Sfnt_Name)
LOAD_FUNCPTR(FT_Get_Sfnt_Name_Count)
LOAD_FUNCPTR(FT_Get_Sfnt_Table)
LOAD_FUNCPTR(FT_Init_FreeType)
LOAD_FUNCPTR(FT_Load_Glyph)
LOAD_FUNCPTR(FT_New_Face)
LOAD_FUNCPTR(FT_Set_Charmap)
#undef LOAD_FUNCPTR
error = pFT_Init_FreeType(&library);
if (error != FT_Err_Ok)
{
ERR("%s returned %i\n", "FT_Init_FreeType", error);
wine_dlclose(ft_handle, NULL, 0);
RegCloseKey(hkey);
return FALSE;
}
if (RegQueryValueExW( hkey, pathW, NULL, NULL, NULL, &len ) == ERROR_SUCCESS)
{
len += sizeof(WCHAR);
valueW = HeapAlloc( GetProcessHeap(), 0, len );
if (RegQueryValueExW( hkey, pathW, NULL, NULL, (LPBYTE)valueW, &len ) == ERROR_SUCCESS)
{
len = WideCharToMultiByte( CP_UNIXCP, 0, valueW, -1, NULL, 0, NULL, NULL );
valueA = HeapAlloc( GetProcessHeap(), 0, len );
WideCharToMultiByte( CP_UNIXCP, 0, valueW, -1, valueA, len, NULL, NULL );
TRACE( "got font path %s\n", debugstr_a(valueA) );
ptr = valueA;
while (ptr)
{
LPSTR next = strchr( ptr, ':' );
if (next) *next++ = 0;
ReadTrueTypeDir( library, ptr );
ptr = next;
}
HeapFree( GetProcessHeap(), 0, valueA );
}
HeapFree( GetProcessHeap(), 0, valueW );
}
RegCloseKey(hkey);
pFT_Done_FreeType(library);
wine_dlclose(ft_handle, NULL, 0);
ft_handle = NULL;
return TRUE;
sym_not_found:
WINE_MESSAGE(
"Wine cannot find certain functions that it needs inside the FreeType\n"
"font library. To enable Wine to use TrueType fonts please upgrade\n"
"FreeType to at least version 2.0.5.\n"
"http://www.freetype.org\n");
RegCloseKey(hkey);
wine_dlclose(ft_handle, NULL, 0);
ft_handle = NULL;
return TRUE;
}
#endif /* HAVE_FREETYPE */
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