Ditch the renderer system in sdl1.3 and use the 'old fashioned' sdl/opengl context. This gives us more flexibility and less problem in receiving video events (expecially on mobile platform) as well as not having to care to reset the gl context every time sdl interferes.
This is a major sdl1.3 update so it should be tested with care (working great on ios)
/***************************************************************************/
/* */
/* gxvprop.c */
/* */
/* TrueTypeGX/AAT prop table validation (body). */
/* */
/* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
/***************************************************************************/
/* */
/* gxvalid is derived from both gxlayout module and otvalid module. */
/* Development of gxlayout is supported by the Information-technology */
/* Promotion Agency(IPA), Japan. */
/* */
/***************************************************************************/
#include "gxvalid.h"
#include "gxvcommn.h"
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_gxvprop
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** Data and Types *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define GXV_PROP_HEADER_SIZE ( 4 + 2 + 2 )
#define GXV_PROP_SIZE_MIN GXV_PROP_HEADER_SIZE
typedef struct GXV_prop_DataRec_
{
FT_Fixed version;
} GXV_prop_DataRec, *GXV_prop_Data;
#define GXV_PROP_DATA( field ) GXV_TABLE_DATA( prop, field )
#define GXV_PROP_FLOATER 0x8000U
#define GXV_PROP_USE_COMPLEMENTARY_BRACKET 0x1000U
#define GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET 0x0F00U
#define GXV_PROP_ATTACHING_TO_RIGHT 0x0080U
#define GXV_PROP_RESERVED 0x0060U
#define GXV_PROP_DIRECTIONALITY_CLASS 0x001FU
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
gxv_prop_zero_advance_validate( FT_UShort gid,
GXV_Validator valid )
{
FT_Face face;
FT_Error error;
FT_GlyphSlot glyph;
GXV_NAME_ENTER( "zero advance" );
face = valid->face;
error = FT_Load_Glyph( face,
gid,
FT_LOAD_IGNORE_TRANSFORM );
if ( error )
FT_INVALID_GLYPH_ID;
glyph = face->glyph;
if ( glyph->advance.x != (FT_Pos)0 ||
glyph->advance.y != (FT_Pos)0 )
FT_INVALID_DATA;
GXV_EXIT;
}
/* Pass 0 as GLYPH to check the default property */
static void
gxv_prop_property_validate( FT_UShort property,
FT_UShort glyph,
GXV_Validator valid )
{
if ( glyph != 0 && ( property & GXV_PROP_FLOATER ) )
gxv_prop_zero_advance_validate( glyph, valid );
if ( property & GXV_PROP_USE_COMPLEMENTARY_BRACKET )
{
FT_UShort offset;
char complement;
offset = (FT_UShort)( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET );
if ( offset == 0 )
FT_INVALID_DATA;
complement = (char)( offset >> 8 );
if ( complement & 0x08 )
{
/* Top bit is set: negative */
/* Calculate the absolute offset */
complement = (char)( ( complement & 0x07 ) + 1 );
/* The gid for complement must be greater than 0 */
if ( glyph <= complement )
FT_INVALID_DATA;
}
else
{
/* The gid for complement must be the face. */
gxv_glyphid_validate( (FT_UShort)( glyph + complement ), valid );
}
}
else
{
if ( property & GXV_PROP_COMPLEMENTARY_BRACKET_OFFSET )
GXV_TRACE(( "glyph %d cannot have complementary bracketing\n",
glyph ));
}
/* this is introduced in version 2.0 */
if ( property & GXV_PROP_ATTACHING_TO_RIGHT )
{
if ( GXV_PROP_DATA( version ) == 0x00010000UL )
FT_INVALID_DATA;
}
if ( property & GXV_PROP_RESERVED )
FT_INVALID_DATA;
if ( ( property & GXV_PROP_DIRECTIONALITY_CLASS ) > 11 )
{
/* TODO: Too restricted. Use the validation level. */
if ( GXV_PROP_DATA( version ) == 0x00010000UL ||
GXV_PROP_DATA( version ) == 0x00020000UL )
FT_INVALID_DATA;
}
}
static void
gxv_prop_LookupValue_validate( FT_UShort glyph,
GXV_LookupValueCPtr value_p,
GXV_Validator valid )
{
gxv_prop_property_validate( value_p->u, glyph, valid );
}
/*
+===============+ --------+
| lookup header | |
+===============+ |
| BinSrchHeader | |
+===============+ |
| lastGlyph[0] | |
+---------------+ |
| firstGlyph[0] | | head of lookup table
+---------------+ | +
| offset[0] | -> | offset [byte]
+===============+ | +
| lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte]
+---------------+ |
| firstGlyph[1] | |
+---------------+ |
| offset[1] | |
+===============+ |
|
... |
|
16bit value array |
+===============+ |
| value | <-------+
...
*/
static GXV_LookupValueDesc
gxv_prop_LookupFmt4_transit( FT_UShort relative_gindex,
GXV_LookupValueCPtr base_value_p,
FT_Bytes lookuptbl_limit,
GXV_Validator valid )
{
FT_Bytes p;
FT_Bytes limit;
FT_UShort offset;
GXV_LookupValueDesc value;
/* XXX: check range? */
offset = (FT_UShort)( base_value_p->u +
relative_gindex * sizeof( FT_UShort ) );
p = valid->lookuptbl_head + offset;
limit = lookuptbl_limit;
GXV_LIMIT_CHECK ( 2 );
value.u = FT_NEXT_USHORT( p );
return value;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** prop TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
gxv_prop_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
FT_Bytes p = table;
FT_Bytes limit = 0;
GXV_ValidatorRec validrec;
GXV_Validator valid = &validrec;
GXV_prop_DataRec proprec;
GXV_prop_Data prop = &proprec;
FT_Fixed version;
FT_UShort format;
FT_UShort defaultProp;
valid->root = ftvalid;
valid->table_data = prop;
valid->face = face;
FT_TRACE3(( "validating `prop' table\n" ));
GXV_INIT;
GXV_LIMIT_CHECK( 4 + 2 + 2 );
version = FT_NEXT_ULONG( p );
format = FT_NEXT_USHORT( p );
defaultProp = FT_NEXT_USHORT( p );
/* only versions 1.0, 2.0, 3.0 are defined (1996) */
if ( version != 0x00010000UL &&
version != 0x00020000UL &&
version != 0x00030000UL )
FT_INVALID_FORMAT;
/* only formats 0x0000, 0x0001 are defined (1996) */
if ( format > 1 )
FT_INVALID_FORMAT;
gxv_prop_property_validate( defaultProp, 0, valid );
if ( format == 0 )
{
FT_TRACE3(( "(format 0, no per-glyph properties, "
"remaining %d bytes are skipped)", limit - p ));
goto Exit;
}
/* format == 1 */
GXV_PROP_DATA( version ) = version;
valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
valid->lookupval_func = gxv_prop_LookupValue_validate;
valid->lookupfmt4_trans = gxv_prop_LookupFmt4_transit;
gxv_LookupTable_validate( p, limit, valid );
Exit:
FT_TRACE4(( "\n" ));
}
/* END */