WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/freetype/src/cid/cidgload.c

Rev	Author	Line No.	Line
4349	Serge	1	/***************************************************************************/
		2	/* */
		3	/* cidgload.c */
		4	/* */
		5	/* CID-keyed Type1 Glyph Loader (body). */
		6	/* */
		7	/* Copyright 1996-2007, 2009, 2010, 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 "cidload.h"
		21	#include "cidgload.h"
		22	#include FT_INTERNAL_DEBUG_H
		23	#include FT_INTERNAL_STREAM_H
		24	#include FT_OUTLINE_H
		25	#include FT_INTERNAL_CALC_H
		26
		27	#include "ciderrs.h"
		28
		29
		30	/*************************************************************************/
		31	/* */
		32	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
		33	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
		34	/* messages during execution. */
		35	/* */
		36	#undef FT_COMPONENT
		37	#define FT_COMPONENT trace_cidgload
		38
		39
		40	FT_CALLBACK_DEF( FT_Error )
		41	cid_load_glyph( T1_Decoder decoder,
		42	FT_UInt glyph_index )
		43	{
		44	CID_Face face = (CID_Face)decoder->builder.face;
		45	CID_FaceInfo cid = &face->cid;
		46	FT_Byte* p;
		47	FT_UInt fd_select;
		48	FT_Stream stream = face->cid_stream;
		49	FT_Error error = FT_Err_Ok;
		50	FT_Byte* charstring = 0;
		51	FT_Memory memory = face->root.memory;
		52	FT_ULong glyph_length = 0;
		53	PSAux_Service psaux = (PSAux_Service)face->psaux;
		54
		55	#ifdef FT_CONFIG_OPTION_INCREMENTAL
		56	FT_Incremental_InterfaceRec *inc =
		57	face->root.internal->incremental_interface;
		58	#endif
		59
		60
		61	FT_TRACE4(( "cid_load_glyph: glyph index %d\n", glyph_index ));
		62
		63	#ifdef FT_CONFIG_OPTION_INCREMENTAL
		64
		65	/* For incremental fonts get the character data using */
		66	/* the callback function. */
		67	if ( inc )
		68	{
		69	FT_Data glyph_data;
		70
		71
		72	error = inc->funcs->get_glyph_data( inc->object,
		73	glyph_index, &glyph_data );
		74	if ( error )
		75	goto Exit;
		76
		77	p = (FT_Byte*)glyph_data.pointer;
		78	fd_select = (FT_UInt)cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
		79
		80	if ( glyph_data.length != 0 )
		81	{
		82	glyph_length = glyph_data.length - cid->fd_bytes;
		83	(void)FT_ALLOC( charstring, glyph_length );
		84	if ( !error )
		85	ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes,
		86	glyph_length );
		87	}
		88
		89	inc->funcs->free_glyph_data( inc->object, &glyph_data );
		90
		91	if ( error )
		92	goto Exit;
		93	}
		94
		95	else
		96
		97	#endif /* FT_CONFIG_OPTION_INCREMENTAL */
		98
		99	/* For ordinary fonts read the CID font dictionary index */
		100	/* and charstring offset from the CIDMap. */
		101	{
		102	FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes;
		103	FT_ULong off1;
		104
		105
		106	if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
		107	glyph_index * entry_len ) \|\|
		108	FT_FRAME_ENTER( 2 * entry_len ) )
		109	goto Exit;
		110
		111	p = (FT_Byte*)stream->cursor;
		112	fd_select = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
		113	off1 = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
		114	p += cid->fd_bytes;
		115	glyph_length = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
		116	FT_FRAME_EXIT();
		117
		118	if ( fd_select >= (FT_UInt)cid->num_dicts )
		119	{
		120	error = FT_THROW( Invalid_Offset );
		121	goto Exit;
		122	}
		123	if ( glyph_length == 0 )
		124	goto Exit;
		125	if ( FT_ALLOC( charstring, glyph_length ) )
		126	goto Exit;
		127	if ( FT_STREAM_READ_AT( cid->data_offset + off1,
		128	charstring, glyph_length ) )
		129	goto Exit;
		130	}
		131
		132	/* Now set up the subrs array and parse the charstrings. */
		133	{
		134	CID_FaceDict dict;
		135	CID_Subrs cid_subrs = face->subrs + fd_select;
		136	FT_Int cs_offset;
		137
		138
		139	/* Set up subrs */
		140	decoder->num_subrs = cid_subrs->num_subrs;
		141	decoder->subrs = cid_subrs->code;
		142	decoder->subrs_len = 0;
		143
		144	/* Set up font matrix */
		145	dict = cid->font_dicts + fd_select;
		146
		147	decoder->font_matrix = dict->font_matrix;
		148	decoder->font_offset = dict->font_offset;
		149	decoder->lenIV = dict->private_dict.lenIV;
		150
		151	/* Decode the charstring. */
		152
		153	/* Adjustment for seed bytes. */
		154	cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
		155
		156	/* Decrypt only if lenIV >= 0. */
		157	if ( decoder->lenIV >= 0 )
		158	psaux->t1_decrypt( charstring, glyph_length, 4330 );
		159
		160	error = decoder->funcs.parse_charstrings(
		161	decoder, charstring + cs_offset,
		162	(FT_Int)glyph_length - cs_offset );
		163	}
		164
		165	FT_FREE( charstring );
		166
		167	#ifdef FT_CONFIG_OPTION_INCREMENTAL
		168
		169	/* Incremental fonts can optionally override the metrics. */
		170	if ( !error && inc && inc->funcs->get_glyph_metrics )
		171	{
		172	FT_Incremental_MetricsRec metrics;
		173
		174
		175	metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
		176	metrics.bearing_y = 0;
		177	metrics.advance = FIXED_TO_INT( decoder->builder.advance.x );
		178	metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );
		179
		180	error = inc->funcs->get_glyph_metrics( inc->object,
		181	glyph_index, FALSE, &metrics );
		182
		183	decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
		184	decoder->builder.advance.x = INT_TO_FIXED( metrics.advance );
		185	decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v );
		186	}
		187
		188	#endif /* FT_CONFIG_OPTION_INCREMENTAL */
		189
		190	Exit:
		191	return error;
		192	}
		193
		194
		195	#if 0
		196
		197
		198	/*************************************************************************/
		199	/*************************************************************************/
		200	/*************************************************************************/
		201	/******** *******/
		202	/******** *******/
		203	/******** COMPUTE THE MAXIMUM ADVANCE WIDTH *******/
		204	/******** *******/
		205	/******** The following code is in charge of computing *******/
		206	/******** the maximum advance width of the font. It *******/
		207	/******** quickly processes each glyph charstring to *******/
		208	/******** extract the value from either a `sbw' or `seac' *******/
		209	/******** operator. *******/
		210	/******** *******/
		211	/*************************************************************************/
		212	/*************************************************************************/
		213	/*************************************************************************/
		214
		215
		216	FT_LOCAL_DEF( FT_Error )
		217	cid_face_compute_max_advance( CID_Face face,
		218	FT_Int* max_advance )
		219	{
		220	FT_Error error;
		221	T1_DecoderRec decoder;
		222	FT_Int glyph_index;
		223
		224	PSAux_Service psaux = (PSAux_Service)face->psaux;
		225
		226
		227	*max_advance = 0;
		228
		229	/* Initialize load decoder */
		230	error = psaux->t1_decoder_funcs->init( &decoder,
		231	(FT_Face)face,
		232	0, /* size */
		233	0, /* glyph slot */
		234	0, /* glyph names! XXX */
		235	0, /* blend == 0 */
		236	0, /* hinting == 0 */
		237	cid_load_glyph );
		238	if ( error )
		239	return error;
		240
		241	/* TODO: initialize decoder.len_buildchar and decoder.buildchar */
		242	/* if we ever support CID-keyed multiple master fonts */
		243
		244	decoder.builder.metrics_only = 1;
		245	decoder.builder.load_points = 0;
		246
		247	/* for each glyph, parse the glyph charstring and extract */
		248	/* the advance width */
		249	for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
		250	glyph_index++ )
		251	{
		252	/* now get load the unscaled outline */
		253	error = cid_load_glyph( &decoder, glyph_index );
		254	/* ignore the error if one occurred - skip to next glyph */
		255	}
		256
		257	*max_advance = FIXED_TO_INT( decoder.builder.advance.x );
		258
		259	psaux->t1_decoder_funcs->done( &decoder );
		260
		261	return FT_Err_Ok;
		262	}
		263
		264
		265	#endif /* 0 */
		266
		267
		268	FT_LOCAL_DEF( FT_Error )
		269	cid_slot_load_glyph( FT_GlyphSlot cidglyph, /* CID_GlyphSlot */
		270	FT_Size cidsize, /* CID_Size */
		271	FT_UInt glyph_index,
		272	FT_Int32 load_flags )
		273	{
		274	CID_GlyphSlot glyph = (CID_GlyphSlot)cidglyph;
		275	FT_Error error;
		276	T1_DecoderRec decoder;
		277	CID_Face face = (CID_Face)cidglyph->face;
		278	FT_Bool hinting;
		279
		280	PSAux_Service psaux = (PSAux_Service)face->psaux;
		281	FT_Matrix font_matrix;
		282	FT_Vector font_offset;
		283
		284
		285	if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
		286	{
		287	error = FT_THROW( Invalid_Argument );
		288	goto Exit;
		289	}
		290
		291	if ( load_flags & FT_LOAD_NO_RECURSE )
		292	load_flags \|= FT_LOAD_NO_SCALE \| FT_LOAD_NO_HINTING;
		293
		294	glyph->x_scale = cidsize->metrics.x_scale;
		295	glyph->y_scale = cidsize->metrics.y_scale;
		296
		297	cidglyph->outline.n_points = 0;
		298	cidglyph->outline.n_contours = 0;
		299
		300	hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
		301	( load_flags & FT_LOAD_NO_HINTING ) == 0 );
		302
		303	cidglyph->format = FT_GLYPH_FORMAT_OUTLINE;
		304
		305	error = psaux->t1_decoder_funcs->init( &decoder,
		306	cidglyph->face,
		307	cidsize,
		308	cidglyph,
		309	0, /* glyph names -- XXX */
		310	0, /* blend == 0 */
		311	hinting,
		312	FT_LOAD_TARGET_MODE( load_flags ),
		313	cid_load_glyph );
		314	if ( error )
		315	goto Exit;
		316
		317	/* TODO: initialize decoder.len_buildchar and decoder.buildchar */
		318	/* if we ever support CID-keyed multiple master fonts */
		319
		320	/* set up the decoder */
		321	decoder.builder.no_recurse = FT_BOOL(
		322	( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) );
		323
		324	error = cid_load_glyph( &decoder, glyph_index );
		325	if ( error )
		326	goto Exit;
		327
		328	font_matrix = decoder.font_matrix;
		329	font_offset = decoder.font_offset;
		330
		331	/* save new glyph tables */
		332	psaux->t1_decoder_funcs->done( &decoder );
		333
		334	/* now set the metrics -- this is rather simple, as */
		335	/* the left side bearing is the xMin, and the top side */
		336	/* bearing the yMax */
		337	cidglyph->outline.flags &= FT_OUTLINE_OWNER;
		338	cidglyph->outline.flags \|= FT_OUTLINE_REVERSE_FILL;
		339
		340	/* for composite glyphs, return only left side bearing and */
		341	/* advance width */
		342	if ( load_flags & FT_LOAD_NO_RECURSE )
		343	{
		344	FT_Slot_Internal internal = cidglyph->internal;
		345
		346
		347	cidglyph->metrics.horiBearingX =
		348	FIXED_TO_INT( decoder.builder.left_bearing.x );
		349	cidglyph->metrics.horiAdvance =
		350	FIXED_TO_INT( decoder.builder.advance.x );
		351
		352	internal->glyph_matrix = font_matrix;
		353	internal->glyph_delta = font_offset;
		354	internal->glyph_transformed = 1;
		355	}
		356	else
		357	{
		358	FT_BBox cbox;
		359	FT_Glyph_Metrics* metrics = &cidglyph->metrics;
		360	FT_Vector advance;
		361
		362
		363	/* copy the _unscaled_ advance width */
		364	metrics->horiAdvance =
		365	FIXED_TO_INT( decoder.builder.advance.x );
		366	cidglyph->linearHoriAdvance =
		367	FIXED_TO_INT( decoder.builder.advance.x );
		368	cidglyph->internal->glyph_transformed = 0;
		369
		370	/* make up vertical ones */
		371	metrics->vertAdvance = ( face->cid.font_bbox.yMax -
		372	face->cid.font_bbox.yMin ) >> 16;
		373	cidglyph->linearVertAdvance = metrics->vertAdvance;
		374
		375	cidglyph->format = FT_GLYPH_FORMAT_OUTLINE;
		376
		377	if ( cidsize->metrics.y_ppem < 24 )
		378	cidglyph->outline.flags \|= FT_OUTLINE_HIGH_PRECISION;
		379
		380	/* apply the font matrix */
		381	FT_Outline_Transform( &cidglyph->outline, &font_matrix );
		382
		383	FT_Outline_Translate( &cidglyph->outline,
		384	font_offset.x,
		385	font_offset.y );
		386
		387	advance.x = metrics->horiAdvance;
		388	advance.y = 0;
		389	FT_Vector_Transform( &advance, &font_matrix );
		390	metrics->horiAdvance = advance.x + font_offset.x;
		391
		392	advance.x = 0;
		393	advance.y = metrics->vertAdvance;
		394	FT_Vector_Transform( &advance, &font_matrix );
		395	metrics->vertAdvance = advance.y + font_offset.y;
		396
		397	if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
		398	{
		399	/* scale the outline and the metrics */
		400	FT_Int n;
		401	FT_Outline* cur = decoder.builder.base;
		402	FT_Vector* vec = cur->points;
		403	FT_Fixed x_scale = glyph->x_scale;
		404	FT_Fixed y_scale = glyph->y_scale;
		405
		406
		407	/* First of all, scale the points */
		408	if ( !hinting \|\| !decoder.builder.hints_funcs )
		409	for ( n = cur->n_points; n > 0; n--, vec++ )
		410	{
		411	vec->x = FT_MulFix( vec->x, x_scale );
		412	vec->y = FT_MulFix( vec->y, y_scale );
		413	}
		414
		415	/* Then scale the metrics */
		416	metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
		417	metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
		418	}
		419
		420	/* compute the other metrics */
		421	FT_Outline_Get_CBox( &cidglyph->outline, &cbox );
		422
		423	metrics->width = cbox.xMax - cbox.xMin;
		424	metrics->height = cbox.yMax - cbox.yMin;
		425
		426	metrics->horiBearingX = cbox.xMin;
		427	metrics->horiBearingY = cbox.yMax;
		428
		429	if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
		430	{
		431	/* make up vertical ones */
		432	ft_synthesize_vertical_metrics( metrics,
		433	metrics->vertAdvance );
		434	}
		435	}
		436
		437	Exit:
		438	return error;
		439	}
		440
		441
		442	/* END */

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