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gdi32: Add support for checking the font's gasp flags.

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Huw Davies 2011-12-02 14:11:51 +00:00 committed by Alexandre Julliard
parent 225de02a29
commit 4ce3af3fad
1 changed files with 74 additions and 1 deletions
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75
dlls/gdi32/font.c
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@ -32,11 +32,18 @@
#include "windef.h"
#include "winbase.h"
#include "winnls.h"
#include "winternl.h"
#include "gdi_private.h"
#include "wine/exception.h"
#include "wine/unicode.h"
#include "wine/debug.h"
#ifdef WORDS_BIGENDIAN
#define get_be_word(x) (x)
#else
#define get_be_word(x) RtlUshortByteSwap(x)
#endif
WINE_DEFAULT_DEBUG_CHANNEL(font);
/* Device -> World size conversion */
@ -258,10 +265,73 @@ static void FONT_NewTextMetricExWToA(const NEWTEXTMETRICEXW *ptmW, NEWTEXTMETRIC
memcpy(&ptmA->ntmFontSig, &ptmW->ntmFontSig, sizeof(FONTSIGNATURE));
}
static DWORD get_font_ppem( HDC hdc )
{
TEXTMETRICW tm;
DWORD ppem;
DC *dc = get_dc_ptr( hdc );
if (!dc) return GDI_ERROR;
GetTextMetricsW( hdc, &tm );
ppem = abs( INTERNAL_YWSTODS( dc, tm.tmAscent + tm.tmDescent - tm.tmInternalLeading ) );
release_dc_ptr( dc );
return ppem;
}
#define GASP_GRIDFIT 0x01
#define GASP_DOGRAY 0x02
static BOOL get_gasp_flags( HDC hdc, WORD *flags )
{
DWORD size, gasp_tag = 0x70736167;
WORD buf[16]; /* Enough for seven ranges before we need to alloc */
WORD *alloced = NULL, *ptr = buf;
WORD num_recs, version;
DWORD ppem = get_font_ppem( hdc );
BOOL ret = FALSE;
*flags = 0;
if (ppem == GDI_ERROR) return FALSE;
size = GetFontData( hdc, gasp_tag, 0, NULL, 0 );
if (size == GDI_ERROR) return FALSE;
if (size < 4 * sizeof(WORD)) return FALSE;
if (size > sizeof(buf))
{
ptr = alloced = HeapAlloc( GetProcessHeap(), 0, size );
if (!ptr) return FALSE;
}
GetFontData( hdc, gasp_tag, 0, ptr, size );
version = get_be_word( *ptr++ );
num_recs = get_be_word( *ptr++ );
if (version > 1 || size < (num_recs * 2 + 2) * sizeof(WORD))
{
FIXME( "Unsupported gasp table: ver %d size %d recs %d\n", version, size, num_recs );
goto done;
}
while (num_recs--)
{
*flags = get_be_word( *(ptr + 1) );
if (ppem <= get_be_word( *ptr )) break;
ptr += 2;
}
TRACE( "got flags %04x for ppem %d\n", *flags, ppem );
ret = TRUE;
done:
HeapFree( GetProcessHeap(), 0, alloced );
return ret;
}
UINT get_font_aa_flags( HDC hdc )
{
LOGFONTW lf;
WORD gasp_flags;
if (GetObjectType( hdc ) == OBJ_MEMDC)
{
@ -274,7 +344,10 @@ UINT get_font_aa_flags( HDC hdc )
GetObjectW( GetCurrentObject( hdc, OBJ_FONT ), sizeof(lf), &lf );
if (lf.lfQuality == NONANTIALIASED_QUALITY) return GGO_BITMAP;
/* FIXME, check gasp and user prefs */
if (get_gasp_flags( hdc, &gasp_flags ) && !(gasp_flags & GASP_DOGRAY))
return GGO_BITMAP;
/* FIXME, check user prefs */
return GGO_GRAY4_BITMAP;
}