WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/freetype/src/sfnt/ttmtx.c

Rev	Author	Line No.	Line
4349	Serge	1	/***************************************************************************/
		2	/* */
		3	/* ttmtx.c */
		4	/* */
		5	/* Load the metrics tables common to TTF and OTF fonts (body). */
		6	/* */
		7	/* Copyright 2006-2009, 2011-2013 by */
		8	/* David Turner, Robert Wilhelm, and Werner Lemberg. */
		9	/* */
		10	/* This file is part of the FreeType project, and may only be used, */
		11	/* modified, and distributed under the terms of the FreeType project */
		12	/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
		13	/* this file you indicate that you have read the license and */
		14	/* understand and accept it fully. */
		15	/* */
		16	/***************************************************************************/
		17
		18
		19	#include
		20	#include FT_INTERNAL_DEBUG_H
		21	#include FT_INTERNAL_STREAM_H
		22	#include FT_TRUETYPE_TAGS_H
		23	#include "ttmtx.h"
		24
		25	#include "sferrors.h"
		26
		27
		28	/*************************************************************************/
		29	/* */
		30	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
		31	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
		32	/* messages during execution. */
		33	/* */
		34	#undef FT_COMPONENT
		35	#define FT_COMPONENT trace_ttmtx
		36
		37
		38	/*************************************************************************/
		39	/* */
		40	/* */
		41	/* tt_face_load_hmtx */
		42	/* */
		43	/* */
		44	/* Load the `hmtx' or `vmtx' table into a face object. */
		45	/* */
		46	/* */
		47	/* face :: A handle to the target face object. */
		48	/* */
		49	/* stream :: The input stream. */
		50	/* */
		51	/* vertical :: A boolean flag. If set, load `vmtx'. */
		52	/* */
		53	/* */
		54	/* FreeType error code. 0 means success. */
		55	/* */
		56	FT_LOCAL_DEF( FT_Error )
		57	tt_face_load_hmtx( TT_Face face,
		58	FT_Stream stream,
		59	FT_Bool vertical )
		60	{
		61	FT_Error error;
		62	FT_ULong tag, table_size;
		63	FT_ULong* ptable_offset;
		64	FT_ULong* ptable_size;
		65
		66
		67	if ( vertical )
		68	{
		69	tag = TTAG_vmtx;
		70	ptable_offset = &face->vert_metrics_offset;
		71	ptable_size = &face->vert_metrics_size;
		72	}
		73	else
		74	{
		75	tag = TTAG_hmtx;
		76	ptable_offset = &face->horz_metrics_offset;
		77	ptable_size = &face->horz_metrics_size;
		78	}
		79
		80	error = face->goto_table( face, tag, stream, &table_size );
		81	if ( error )
		82	goto Fail;
		83
		84	*ptable_size = table_size;
		85	*ptable_offset = FT_STREAM_POS();
		86
		87	Fail:
		88	return error;
		89	}
		90
		91
		92	/*************************************************************************/
		93	/* */
		94	/* */
		95	/* tt_face_load_hhea */
		96	/* */
		97	/* */
		98	/* Load the `hhea' or 'vhea' table into a face object. */
		99	/* */
		100	/* */
		101	/* face :: A handle to the target face object. */
		102	/* */
		103	/* stream :: The input stream. */
		104	/* */
		105	/* vertical :: A boolean flag. If set, load `vhea'. */
		106	/* */
		107	/* */
		108	/* FreeType error code. 0 means success. */
		109	/* */
		110	FT_LOCAL_DEF( FT_Error )
		111	tt_face_load_hhea( TT_Face face,
		112	FT_Stream stream,
		113	FT_Bool vertical )
		114	{
		115	FT_Error error;
		116	TT_HoriHeader* header;
		117
		118	static const FT_Frame_Field metrics_header_fields[] =
		119	{
		120	#undef FT_STRUCTURE
		121	#define FT_STRUCTURE TT_HoriHeader
		122
		123	FT_FRAME_START( 36 ),
		124	FT_FRAME_ULONG ( Version ),
		125	FT_FRAME_SHORT ( Ascender ),
		126	FT_FRAME_SHORT ( Descender ),
		127	FT_FRAME_SHORT ( Line_Gap ),
		128	FT_FRAME_USHORT( advance_Width_Max ),
		129	FT_FRAME_SHORT ( min_Left_Side_Bearing ),
		130	FT_FRAME_SHORT ( min_Right_Side_Bearing ),
		131	FT_FRAME_SHORT ( xMax_Extent ),
		132	FT_FRAME_SHORT ( caret_Slope_Rise ),
		133	FT_FRAME_SHORT ( caret_Slope_Run ),
		134	FT_FRAME_SHORT ( caret_Offset ),
		135	FT_FRAME_SHORT ( Reserved[0] ),
		136	FT_FRAME_SHORT ( Reserved[1] ),
		137	FT_FRAME_SHORT ( Reserved[2] ),
		138	FT_FRAME_SHORT ( Reserved[3] ),
		139	FT_FRAME_SHORT ( metric_Data_Format ),
		140	FT_FRAME_USHORT( number_Of_HMetrics ),
		141	FT_FRAME_END
		142	};
		143
		144
		145	if ( vertical )
		146	{
		147	void *v = &face->vertical;
		148
		149
		150	error = face->goto_table( face, TTAG_vhea, stream, 0 );
		151	if ( error )
		152	goto Fail;
		153
		154	header = (TT_HoriHeader*)v;
		155	}
		156	else
		157	{
		158	error = face->goto_table( face, TTAG_hhea, stream, 0 );
		159	if ( error )
		160	goto Fail;
		161
		162	header = &face->horizontal;
		163	}
		164
		165	if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )
		166	goto Fail;
		167
		168	FT_TRACE3(( "Ascender: %5d\n", header->Ascender ));
		169	FT_TRACE3(( "Descender: %5d\n", header->Descender ));
		170	FT_TRACE3(( "number_Of_Metrics: %5u\n", header->number_Of_HMetrics ));
		171
		172	header->long_metrics = NULL;
		173	header->short_metrics = NULL;
		174
		175	Fail:
		176	return error;
		177	}
		178
		179
		180	/*************************************************************************/
		181	/* */
		182	/* */
		183	/* tt_face_get_metrics */
		184	/* */
		185	/* */
		186	/* Returns the horizontal or vertical metrics in font units for a */
		187	/* given glyph. The metrics are the left side bearing (resp. top */
		188	/* side bearing) and advance width (resp. advance height). */
		189	/* */
		190	/* */
		191	/* header :: A pointer to either the horizontal or vertical metrics */
		192	/* structure. */
		193	/* */
		194	/* idx :: The glyph index. */
		195	/* */
		196	/* */
		197	/* bearing :: The bearing, either left side or top side. */
		198	/* */
		199	/* advance :: The advance width resp. advance height. */
		200	/* */
		201	FT_LOCAL_DEF( FT_Error )
		202	tt_face_get_metrics( TT_Face face,
		203	FT_Bool vertical,
		204	FT_UInt gindex,
		205	FT_Short *abearing,
		206	FT_UShort *aadvance )
		207	{
		208	FT_Error error;
		209	FT_Stream stream = face->root.stream;
		210	TT_HoriHeader* header;
		211	FT_ULong table_pos, table_size, table_end;
		212	FT_UShort k;
		213
		214
		215	if ( vertical )
		216	{
		217	void* v = &face->vertical;
		218
		219
		220	header = (TT_HoriHeader*)v;
		221	table_pos = face->vert_metrics_offset;
		222	table_size = face->vert_metrics_size;
		223	}
		224	else
		225	{
		226	header = &face->horizontal;
		227	table_pos = face->horz_metrics_offset;
		228	table_size = face->horz_metrics_size;
		229	}
		230
		231	table_end = table_pos + table_size;
		232
		233	k = header->number_Of_HMetrics;
		234
		235	if ( k > 0 )
		236	{
		237	if ( gindex < (FT_UInt)k )
		238	{
		239	table_pos += 4 * gindex;
		240	if ( table_pos + 4 > table_end )
		241	goto NoData;
		242
		243	if ( FT_STREAM_SEEK( table_pos ) \|\|
		244	FT_READ_USHORT( *aadvance ) \|\|
		245	FT_READ_SHORT( *abearing ) )
		246	goto NoData;
		247	}
		248	else
		249	{
		250	table_pos += 4 * ( k - 1 );
		251	if ( table_pos + 4 > table_end )
		252	goto NoData;
		253
		254	if ( FT_STREAM_SEEK( table_pos ) \|\|
		255	FT_READ_USHORT( *aadvance ) )
		256	goto NoData;
		257
		258	table_pos += 4 + 2 * ( gindex - k );
		259	if ( table_pos + 2 > table_end )
		260	*abearing = 0;
		261	else
		262	{
		263	if ( !FT_STREAM_SEEK( table_pos ) )
		264	(void)FT_READ_SHORT( *abearing );
		265	}
		266	}
		267	}
		268	else
		269	{
		270	NoData:
		271	*abearing = 0;
		272	*aadvance = 0;
		273	}
		274
		275	return FT_Err_Ok;
		276	}
		277
		278
		279	/* END */

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(root)/contrib/sdk/sources/freetype/src/sfnt/ttmtx.c – Rev 4349