46960df7b3
replacement metrics so that they can be modified, not just replaced. For example, CFF fonts need this.
415 lines
16 KiB
C
415 lines
16 KiB
C
/***************************************************************************/
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/* */
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/* t1gload.c */
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/* */
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/* Type 1 Glyph Loader (body). */
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/* */
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/* Copyright 1996-2001, 2002 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include "t1gload.h"
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_OUTLINE_H
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#include FT_INTERNAL_POSTSCRIPT_AUX_H
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#include "t1errors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_t1gload
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/********** *********/
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/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
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/********** *********/
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/********** The following code is in charge of computing *********/
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/********** the maximum advance width of the font. It *********/
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/********** quickly processes each glyph charstring to *********/
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/********** extract the value from either a `sbw' or `seac' *********/
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/********** operator. *********/
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/********** *********/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( FT_Error )
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T1_Parse_Glyph_And_Get_Char_String( T1_Decoder decoder,
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FT_UInt glyph_index,
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FT_Data* char_string )
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{
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T1_Face face = (T1_Face)decoder->builder.face;
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T1_Font type1 = &face->type1;
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FT_Error error = 0;
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decoder->font_matrix = type1->font_matrix;
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decoder->font_offset = type1->font_offset;
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* For incremental fonts get the character data using the */
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/* callback function. */
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if ( face->root.internal->incremental_interface )
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error = face->root.internal->incremental_interface->funcs->get_glyph_data(
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face->root.internal->incremental_interface->object,
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glyph_index, char_string );
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else
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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/* For ordinary fonts get the character data stored in the face record. */
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{
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char_string->pointer = type1->charstrings[glyph_index];
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char_string->length = type1->charstrings_len[glyph_index];
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}
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if ( !error )
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error = decoder->funcs.parse_charstrings(
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decoder, (FT_Byte*)char_string->pointer,
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char_string->length );
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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/* Incremental fonts can optionally override the metrics. */
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if ( !error && face->root.internal->incremental_interface &&
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face->root.internal->incremental_interface->funcs->get_glyph_metrics )
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{
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FT_Incremental_MetricsRec metrics;
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metrics.bearing_x = decoder->builder.left_bearing.x;
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metrics.bearing_y = decoder->builder.left_bearing.y;
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metrics.advance = decoder->builder.advance.x;
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error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
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face->root.internal->incremental_interface->object,
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glyph_index, FALSE, &metrics );
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decoder->builder.left_bearing.x = metrics.bearing_x;
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decoder->builder.left_bearing.y = metrics.bearing_y;
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decoder->builder.advance.x = metrics.advance;
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decoder->builder.advance.y = 0;
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}
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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return error;
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}
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FT_CALLBACK_DEF( FT_Error )
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T1_Parse_Glyph( T1_Decoder decoder,
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FT_UInt glyph_index )
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{
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FT_Data glyph_data;
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FT_Error error = T1_Parse_Glyph_And_Get_Char_String(
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decoder, glyph_index, &glyph_data );
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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if ( !error )
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{
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T1_Face face = (T1_Face)decoder->builder.face;
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if ( face->root.internal->incremental_interface )
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face->root.internal->incremental_interface->funcs->free_glyph_data(
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face->root.internal->incremental_interface->object,
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&glyph_data );
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}
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#endif /* FT_CONFIG_OPTION_INCREMENTAL */
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return error;
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}
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FT_LOCAL_DEF( FT_Error )
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T1_Compute_Max_Advance( T1_Face face,
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FT_Int* max_advance )
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{
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FT_Error error;
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T1_DecoderRec decoder;
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FT_Int glyph_index;
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T1_Font type1 = &face->type1;
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PSAux_Service psaux = (PSAux_Service)face->psaux;
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*max_advance = 0;
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/* initialize load decoder */
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error = psaux->t1_decoder_funcs->init( &decoder,
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(FT_Face)face,
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0, /* size */
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0, /* glyph slot */
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(FT_Byte**)type1->glyph_names,
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face->blend,
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0,
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FT_RENDER_MODE_NORMAL,
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T1_Parse_Glyph );
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if ( error )
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return error;
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decoder.builder.metrics_only = 1;
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decoder.builder.load_points = 0;
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decoder.num_subrs = type1->num_subrs;
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decoder.subrs = type1->subrs;
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decoder.subrs_len = type1->subrs_len;
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*max_advance = 0;
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/* for each glyph, parse the glyph charstring and extract */
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/* the advance width */
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for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
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{
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/* now get load the unscaled outline */
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error = T1_Parse_Glyph( &decoder, glyph_index );
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if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
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*max_advance = decoder.builder.advance.x;
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/* ignore the error if one occured - skip to next glyph */
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}
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return T1_Err_Ok;
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}
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/********** *********/
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/********** UNHINTED GLYPH LOADER *********/
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/********** *********/
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/********** The following code is in charge of loading a *********/
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/********** single outline. It completely ignores hinting *********/
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/********** and is used when FT_LOAD_NO_HINTING is set. *********/
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/********** *********/
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/********** The Type 1 hinter is located in `t1hint.c' *********/
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/********** *********/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( FT_Error )
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T1_Load_Glyph( T1_GlyphSlot glyph,
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T1_Size size,
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FT_UInt glyph_index,
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FT_Int32 load_flags )
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{
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FT_Error error;
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T1_DecoderRec decoder;
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T1_Face face = (T1_Face)glyph->root.face;
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FT_Bool hinting;
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T1_Font type1 = &face->type1;
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PSAux_Service psaux = (PSAux_Service)face->psaux;
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const T1_Decoder_Funcs decoder_funcs = psaux->t1_decoder_funcs;
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FT_Matrix font_matrix;
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FT_Vector font_offset;
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FT_Data glyph_data;
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FT_Bool glyph_data_loaded = 0;
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if ( load_flags & FT_LOAD_NO_RECURSE )
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load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
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glyph->x_scale = size->root.metrics.x_scale;
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glyph->y_scale = size->root.metrics.y_scale;
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glyph->root.outline.n_points = 0;
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glyph->root.outline.n_contours = 0;
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hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
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( load_flags & FT_LOAD_NO_HINTING ) == 0 );
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glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
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error = decoder_funcs->init( &decoder,
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(FT_Face)face,
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(FT_Size)size,
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(FT_GlyphSlot)glyph,
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(FT_Byte**)type1->glyph_names,
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face->blend,
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FT_BOOL( hinting ),
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FT_LOAD_TARGET_MODE(load_flags),
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T1_Parse_Glyph );
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if ( error )
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goto Exit;
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decoder.builder.no_recurse = FT_BOOL(
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( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
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decoder.num_subrs = type1->num_subrs;
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decoder.subrs = type1->subrs;
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decoder.subrs_len = type1->subrs_len;
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/* now load the unscaled outline */
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error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
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&glyph_data );
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if ( error )
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goto Exit;
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glyph_data_loaded = 1;
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font_matrix = decoder.font_matrix;
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font_offset = decoder.font_offset;
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/* save new glyph tables */
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decoder_funcs->done( &decoder );
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/* now, set the metrics -- this is rather simple, as */
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/* the left side bearing is the xMin, and the top side */
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/* bearing the yMax */
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if ( !error )
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{
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glyph->root.outline.flags &= FT_OUTLINE_OWNER;
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glyph->root.outline.flags |= FT_OUTLINE_REVERSE_FILL;
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/* for composite glyphs, return only left side bearing and */
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/* advance width */
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if ( load_flags & FT_LOAD_NO_RECURSE )
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{
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FT_Slot_Internal internal = glyph->root.internal;
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glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
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glyph->root.metrics.horiAdvance = decoder.builder.advance.x;
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internal->glyph_matrix = font_matrix;
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internal->glyph_delta = font_offset;
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internal->glyph_transformed = 1;
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}
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else
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{
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FT_BBox cbox;
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FT_Glyph_Metrics* metrics = &glyph->root.metrics;
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/* copy the _unscaled_ advance width */
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metrics->horiAdvance = decoder.builder.advance.x;
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glyph->root.linearHoriAdvance = decoder.builder.advance.x;
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glyph->root.internal->glyph_transformed = 0;
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/* make up vertical metrics */
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metrics->vertBearingX = 0;
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metrics->vertBearingY = 0;
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metrics->vertAdvance = 0;
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glyph->root.linearVertAdvance = 0;
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glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
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if ( size && size->root.metrics.y_ppem < 24 )
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glyph->root.outline.flags |= FT_OUTLINE_HIGH_PRECISION;
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#if 1
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/* apply the font matrix, if any */
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FT_Outline_Transform( &glyph->root.outline, &font_matrix );
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FT_Outline_Translate( &glyph->root.outline,
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font_offset.x,
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font_offset.y );
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#endif
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if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
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{
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/* scale the outline and the metrics */
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FT_Int n;
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FT_Outline* cur = decoder.builder.base;
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FT_Vector* vec = cur->points;
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FT_Fixed x_scale = glyph->x_scale;
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FT_Fixed y_scale = glyph->y_scale;
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/* First of all, scale the points, if we are not hinting */
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if ( !hinting )
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for ( n = cur->n_points; n > 0; n--, vec++ )
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{
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vec->x = FT_MulFix( vec->x, x_scale );
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vec->y = FT_MulFix( vec->y, y_scale );
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}
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FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
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/* Then scale the metrics */
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metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
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metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
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metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
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metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
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if ( hinting )
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{
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metrics->horiAdvance = ( metrics->horiAdvance + 32 ) & -64;
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metrics->vertAdvance = ( metrics->vertAdvance + 32 ) & -64;
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metrics->vertBearingX = ( metrics->vertBearingX + 32 ) & -64;
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metrics->vertBearingY = ( metrics->vertBearingY + 32 ) & -64;
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}
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}
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/* compute the other metrics */
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FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
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/* grid fit the bounding box if necessary */
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if ( hinting )
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{
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cbox.xMin &= -64;
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cbox.yMin &= -64;
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cbox.xMax = ( cbox.xMax+63 ) & -64;
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cbox.yMax = ( cbox.yMax+63 ) & -64;
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}
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metrics->width = cbox.xMax - cbox.xMin;
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metrics->height = cbox.yMax - cbox.yMin;
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metrics->horiBearingX = cbox.xMin;
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metrics->horiBearingY = cbox.yMax;
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}
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/* Set control data to the glyph charstrings. Note that this is */
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/* _not_ zero-terminated. */
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glyph->root.control_data = (FT_Byte*)glyph_data.pointer;
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glyph->root.control_len = glyph_data.length;
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}
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Exit:
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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if ( glyph_data_loaded && face->root.internal->incremental_interface )
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{
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face->root.internal->incremental_interface->funcs->free_glyph_data(
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face->root.internal->incremental_interface->object,
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&glyph_data );
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/* Set the control data to null - it is no longer available if */
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/* loaded incrementally. */
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glyph->root.control_data = 0;
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glyph->root.control_len = 0;
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}
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#endif
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return error;
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}
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/* END */
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