1825 lines
61 KiB
C
1825 lines
61 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 1996-2000 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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#ifdef FT_FLAT_COMPILE
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#include <type1/t1gload.h>
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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#include <type1/t1hinter.h>
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#endif
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#else /* FT_FLAT_COMPILE */
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#include <type1/t1gload.h>
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#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
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#include <type1/t1hinter.h>
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#endif
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#endif /* FT_FLAT_COMPILE */
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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/ftoutln.h>
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#include <string.h> /* for strcmp() */
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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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/********** *********/
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/********** GENERIC CHARSTRING PARSING *********/
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/********** *********/
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/********** *********/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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static
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void T1_Reset_Builder( T1_Builder* builder,
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FT_Bool reset_base )
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{
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builder->pos_x = 0;
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builder->pos_y = 0;
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builder->left_bearing.x = 0;
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builder->left_bearing.y = 0;
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builder->advance.x = 0;
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builder->advance.y = 0;
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builder->pass = 0;
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builder->hint_point = 0;
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if ( builder->loader )
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{
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if ( reset_base )
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FT_GlyphLoader_Rewind( builder->loader );
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FT_GlyphLoader_Prepare( builder->loader );
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}
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T1_Init_Builder */
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/* */
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/* <Description> */
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/* Initializes a given glyph builder. */
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/* */
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/* <InOut> */
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/* builder :: A pointer to the glyph builder to initialize. */
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/* */
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/* <Input> */
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/* face :: The current face object. */
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/* */
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/* size :: The current size object. */
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/* */
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/* glyph :: The current glyph object. */
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/* */
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/* funcs :: Glyph builder functions (or `methods'). */
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/* */
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LOCAL_FUNC
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void T1_Init_Builder( T1_Builder* builder,
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T1_Face face,
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T1_Size size,
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T1_GlyphSlot glyph,
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const T1_Builder_Funcs* funcs )
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{
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builder->funcs = *funcs;
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builder->path_begun = 0;
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builder->load_points = 1;
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builder->face = face;
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builder->size = size;
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builder->glyph = glyph;
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builder->memory = face->root.memory;
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if ( glyph )
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{
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FT_GlyphLoader* loader = FT_SLOT( glyph )->loader;
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builder->loader = loader;
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builder->base = &loader->base.outline;
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builder->current = &loader->current.outline;
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}
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if ( size )
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{
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builder->scale_x = size->root.metrics.x_scale;
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builder->scale_y = size->root.metrics.y_scale;
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}
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T1_Reset_Builder( builder, 1 );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T1_Done_Builder */
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/* */
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/* <Description> */
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/* Finalizes a given glyph builder. Its contents can still be used */
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/* after the call, but the function saves important information */
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/* within the corresponding glyph slot. */
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/* */
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/* <Input> */
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/* builder :: A pointer to the glyph builder to finalize. */
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/* */
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LOCAL_FUNC
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void T1_Done_Builder( T1_Builder* builder )
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{
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T1_GlyphSlot glyph = builder->glyph;
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if ( glyph )
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glyph->root.outline = *builder->base;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T1_Init_Decoder */
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/* */
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/* <Description> */
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/* Initializes a given glyph decoder. */
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/* */
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/* <InOut> */
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/* decoder :: A pointer to the glyph builder to initialize. */
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/* */
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/* <Input> */
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/* funcs :: The hinting functions interface. */
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/* */
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LOCAL_FUNC
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void T1_Init_Decoder( T1_Decoder* decoder,
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const T1_Hinter_Funcs* funcs )
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{
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decoder->hinter = *funcs; /* copy hinter interface */
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decoder->top = 0;
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decoder->zone = 0;
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decoder->flex_state = 0;
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decoder->num_flex_vectors = 0;
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/* Clear loader */
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MEM_Set( &decoder->builder, 0, sizeof ( decoder->builder ) );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* lookup_glyph_by_stdcharcode */
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/* */
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/* <Description> */
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/* Looks up a given glyph by its StandardEncoding charcode. Used */
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/* to implement the SEAC Type 1 operator. */
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/* */
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/* <Input> */
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/* face :: The current face object. */
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/* */
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/* charcode :: The character code to look for. */
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/* */
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/* <Return> */
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/* A glyph index in the font face. Returns -1 if the corresponding */
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/* glyph wasn't found. */
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/* */
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static
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FT_Int lookup_glyph_by_stdcharcode( T1_Face face,
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FT_Int charcode )
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{
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FT_Int n;
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const FT_String* glyph_name;
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PSNames_Interface* psnames = (PSNames_Interface*)face->psnames;
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/* check range of standard char code */
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if ( charcode < 0 || charcode > 255 )
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return -1;
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glyph_name = psnames->adobe_std_strings(
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psnames->adobe_std_encoding[charcode] );
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for ( n = 0; n < face->type1.num_glyphs; n++ )
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{
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FT_String* name = (FT_String*)face->type1.glyph_names[n];
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if ( name && strcmp( name, glyph_name ) == 0 )
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return n;
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}
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return -1;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* t1operator_seac */
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/* */
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/* <Description> */
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/* Implements the `seac' Type 1 operator for a Type 1 decoder. */
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/* */
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/* <Input> */
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/* decoder :: The current CID decoder. */
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/* */
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/* asb :: The accent's side bearing. */
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/* */
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/* adx :: The horizontal offset of the accent. */
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/* */
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/* ady :: The vertical offset of the accent. */
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/* */
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/* bchar :: The base character's StandardEncoding charcode. */
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/* */
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/* achar :: The accent character's StandardEncoding charcode. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static
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FT_Error t1operator_seac( T1_Decoder* decoder,
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FT_Pos asb,
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FT_Pos adx,
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FT_Pos ady,
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FT_Int bchar,
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FT_Int achar )
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{
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FT_Error error;
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FT_Int bchar_index, achar_index, n_base_points;
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FT_Outline* cur = decoder->builder.current;
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FT_Outline* base = decoder->builder.base;
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FT_Vector left_bearing, advance;
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T1_Face face = decoder->builder.face;
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T1_Font* type1 = &face->type1;
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bchar_index = lookup_glyph_by_stdcharcode( face, bchar );
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achar_index = lookup_glyph_by_stdcharcode( face, achar );
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if ( bchar_index < 0 || achar_index < 0 )
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{
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FT_ERROR(( "t1operator_seac:" ));
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FT_ERROR(( " invalid seac character code arguments\n" ));
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return T1_Err_Syntax_Error;
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}
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/* if we are trying to load a composite glyph, do not load the */
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/* accent character and return the array of subglyphs. */
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if ( decoder->builder.no_recurse )
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{
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FT_GlyphSlot glyph = (FT_GlyphSlot)decoder->builder.glyph;
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FT_GlyphLoader* loader = glyph->loader;
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FT_SubGlyph* subg;
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/* reallocate subglyph array if necessary */
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error = FT_GlyphLoader_Check_Subglyphs( loader, 2 );
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if ( error )
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goto Exit;
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subg = loader->current.subglyphs;
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/* subglyph 0 = base character */
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subg->index = bchar_index;
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subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES |
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FT_SUBGLYPH_FLAG_USE_MY_METRICS;
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subg->arg1 = 0;
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subg->arg2 = 0;
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subg++;
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/* subglyph 1 = accent character */
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subg->index = achar_index;
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subg->flags = FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES;
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subg->arg1 = adx - asb;
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subg->arg2 = ady;
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/* set up remaining glyph fields */
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glyph->num_subglyphs = 2;
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glyph->subglyphs = loader->current.subglyphs;
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glyph->format = ft_glyph_format_composite;
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loader->current.num_subglyphs = 2;
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goto Exit;
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}
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/* First load `bchar' in builder */
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/* now load the unscaled outline */
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if ( decoder->builder.loader )
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FT_GlyphLoader_Prepare( decoder->builder.loader ); /* prepare loader */
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error = T1_Parse_CharStrings( decoder,
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type1->charstrings [bchar_index],
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type1->charstrings_len[bchar_index],
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type1->num_subrs,
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type1->subrs,
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type1->subrs_len );
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if ( error )
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goto Exit;
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n_base_points = cur->n_points;
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/* save the left bearing and width of the base character */
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/* as they will be erased by the next load. */
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left_bearing = decoder->builder.left_bearing;
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advance = decoder->builder.advance;
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decoder->builder.left_bearing.x = 0;
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decoder->builder.left_bearing.y = 0;
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/* Now load `achar' on top of the base outline */
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error = T1_Parse_CharStrings( decoder,
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type1->charstrings [achar_index],
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type1->charstrings_len[achar_index],
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type1->num_subrs,
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type1->subrs,
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type1->subrs_len );
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if ( error )
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return error;
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/* restore the left side bearing and */
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/* advance width of the base character */
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decoder->builder.left_bearing = left_bearing;
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decoder->builder.advance = advance;
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/* Finally, move the accent */
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if ( decoder->builder.load_points )
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{
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FT_Outline dummy;
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dummy.n_points = base->n_points - n_base_points;
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dummy.points = base->points + n_base_points;
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FT_Outline_Translate( &dummy, adx - asb, ady );
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}
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Exit:
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* t1operator_flex */
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/* */
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/* <Description> */
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/* Implements the `flex' Type 1 operator for a Type 1 decoder. */
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/* */
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/* <Input> */
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/* decoder :: The current Type 1 decoder. */
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/* threshold :: The threshold. */
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/* end_x :: The horizontal position of the final flex point. */
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/* end_y :: The vertical position of the final flex point. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static
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FT_Error t1operator_flex( T1_Decoder* decoder,
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FT_Pos threshold,
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FT_Pos end_x,
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FT_Pos end_y )
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{
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FT_Vector vec;
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FT_Vector* flex = decoder->flex_vectors;
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FT_Int n;
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FT_UNUSED( threshold );
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FT_UNUSED( end_x );
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FT_UNUSED( end_y );
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/* we don't even try to test the threshold in the non-hinting */
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/* builder, even if the flex operator is said to be a path */
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/* construction statement in the specification. This is better */
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/* left to the hinter. */
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flex = decoder->flex_vectors;
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vec = *flex++;
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for ( n = 0; n < 6; n++ )
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{
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flex->x += vec.x;
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flex->y += vec.y;
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vec = *flex++;
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}
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flex = decoder->flex_vectors;
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return decoder->builder.funcs.rcurve_to( &decoder->builder,
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flex[0].x, flex[0].y,
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flex[1].x, flex[1].y,
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flex[2].x, flex[2].y ) ||
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decoder->builder.funcs.rcurve_to( &decoder->builder,
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flex[3].x, flex[3].y,
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flex[4].x, flex[4].y,
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flex[5].x, flex[5].y );
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T1_Parse_CharStrings */
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/* */
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/* <Description> */
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/* Parses a given Type 1 charstrings program. */
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/* */
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/* <Input> */
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/* decoder :: The current Type 1 decoder. */
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/* */
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/* charstring_base :: The base address of the charstring stream. */
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/* */
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/* charstring_len :: The length in bytes of the charstring stream. */
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/* */
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/* num_subrs :: The number of sub-routines. */
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/* */
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/* subrs_base :: An array of sub-routines addresses. */
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/* */
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/* subrs_len :: An array of sub-routines lengths. */
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/* */
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/* <Return> */
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/* Free error code. 0 means success. */
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/* */
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LOCAL_FUNC
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FT_Error T1_Parse_CharStrings( T1_Decoder* decoder,
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FT_Byte* charstring_base,
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FT_Int charstring_len,
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FT_Int num_subrs,
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FT_Byte** subrs_base,
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FT_Int* subrs_len )
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{
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FT_Error error;
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T1_Decoder_Zone* zone;
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FT_Byte* ip;
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FT_Byte* limit;
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T1_Builder* builder = &decoder->builder;
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T1_Builder_Funcs* builds = &builder->funcs;
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T1_Hinter_Funcs* hints = &decoder->hinter;
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static
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const FT_Int args_count[op_max] =
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{
|
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0, /* none */
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0, /* endchar */
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2, /* hsbw */
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5, /* seac */
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4, /* sbw */
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0, /* closepath */
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1, /* hlineto */
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1, /* hmoveto */
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4, /* hvcurveto */
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2, /* rlineto */
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2, /* rmoveto */
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6, /* rrcurveto */
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4, /* vhcurveto */
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1, /* vlineto */
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1, /* vmoveto */
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0, /* dotsection */
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2, /* hstem */
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6, /* hstem3 */
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2, /* vstem */
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6, /* vstem3 */
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2, /* div */
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-1, /* callothersubr */
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1, /* callsubr */
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0, /* pop */
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0, /* return */
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2 /* setcurrentpoint */
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};
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|
|
|
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/* First of all, initialize the decoder */
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decoder->top = decoder->stack;
|
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decoder->zone = decoder->zones;
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zone = decoder->zones;
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builder->path_begun = 0;
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zone->base = charstring_base;
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limit = zone->limit = charstring_base + charstring_len;
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ip = zone->cursor = zone->base;
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|
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error = T1_Err_Ok;
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|
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/* now, execute loop */
|
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while ( ip < limit )
|
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{
|
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FT_Int* top = decoder->top;
|
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T1_Operator op = op_none;
|
|
FT_Long value = 0;
|
|
|
|
|
|
/* Start with the decompression of operator or value */
|
|
switch ( *ip++ )
|
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{
|
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case 1:
|
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op = op_hstem;
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break;
|
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|
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case 3:
|
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op = op_vstem;
|
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break;
|
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case 4:
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op = op_vmoveto;
|
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break;
|
|
case 5:
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op = op_rlineto;
|
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break;
|
|
case 6:
|
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op = op_hlineto;
|
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break;
|
|
case 7:
|
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op = op_vlineto;
|
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break;
|
|
case 8:
|
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op = op_rrcurveto;
|
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break;
|
|
case 9:
|
|
op = op_closepath;
|
|
break;
|
|
case 10:
|
|
op = op_callsubr;
|
|
break;
|
|
case 11:
|
|
op = op_return;
|
|
break;
|
|
|
|
case 13:
|
|
op = op_hsbw;
|
|
break;
|
|
case 14:
|
|
op = op_endchar;
|
|
break;
|
|
|
|
case 21:
|
|
op = op_rmoveto;
|
|
break;
|
|
case 22:
|
|
op = op_hmoveto;
|
|
break;
|
|
|
|
case 30:
|
|
op = op_vhcurveto;
|
|
break;
|
|
case 31:
|
|
op = op_hvcurveto;
|
|
break;
|
|
|
|
case 12:
|
|
if ( ip > limit )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: invalid escape (12+EOF)\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
switch ( *ip++ )
|
|
{
|
|
case 0:
|
|
op = op_dotsection;
|
|
break;
|
|
case 1:
|
|
op = op_vstem3;
|
|
break;
|
|
case 2:
|
|
op = op_hstem3;
|
|
break;
|
|
case 6:
|
|
op = op_seac;
|
|
break;
|
|
case 7:
|
|
op = op_sbw;
|
|
break;
|
|
case 12:
|
|
op = op_div;
|
|
break;
|
|
case 16:
|
|
op = op_callothersubr;
|
|
break;
|
|
case 17:
|
|
op = op_pop;
|
|
break;
|
|
case 33:
|
|
op = op_setcurrentpoint;
|
|
break;
|
|
|
|
default:
|
|
FT_ERROR(( "T1_Parse_CharStrings: invalid escape (12+%d)\n",
|
|
ip[-1] ));
|
|
goto Syntax_Error;
|
|
}
|
|
break;
|
|
|
|
case 255: /* four bytes integer */
|
|
if ( ip + 4 > limit )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: unexpected EOF in integer\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
value = ( (FT_Long)ip[0] << 24 ) |
|
|
( (FT_Long)ip[1] << 16 ) |
|
|
( (FT_Long)ip[2] << 8 ) |
|
|
ip[3];
|
|
ip += 4;
|
|
break;
|
|
|
|
default:
|
|
if ( ip[-1] >= 32 )
|
|
{
|
|
if ( ip[-1] < 247 )
|
|
value = (FT_Long)ip[-1] - 139;
|
|
else
|
|
{
|
|
if ( ++ip > limit )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings:" ));
|
|
FT_ERROR(( " unexpected EOF in integer\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
if ( ip[-2] < 251 )
|
|
value = ((FT_Long)( ip[-2] - 247 ) << 8 ) + ip[-1] + 108;
|
|
else
|
|
value = -( ( ( (FT_Long)ip[-2] - 251 ) << 8 ) + ip[-1] + 108 );
|
|
}
|
|
}
|
|
else
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: invalid byte (%d)\n",
|
|
ip[-1] ));
|
|
goto Syntax_Error;
|
|
}
|
|
}
|
|
|
|
/* push value if necessary */
|
|
if ( op == op_none )
|
|
{
|
|
if ( top - decoder->stack >= T1_MAX_CHARSTRINGS_OPERANDS )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: stack overflow!\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
*top++ = value;
|
|
decoder->top = top;
|
|
}
|
|
|
|
else if ( op == op_callothersubr ) /* check arguments differently */
|
|
{
|
|
if ( top - decoder->stack < 2 )
|
|
goto Stack_Underflow;
|
|
|
|
top -= 2;
|
|
|
|
switch ( top[1] )
|
|
{
|
|
case 1: /* start flex feature */
|
|
if ( top[0] != 0 )
|
|
goto Unexpected_OtherSubr;
|
|
|
|
decoder->flex_state = 1;
|
|
decoder->num_flex_vectors = 0;
|
|
decoder->flex_vectors[0].x = 0;
|
|
decoder->flex_vectors[0].y = 0;
|
|
break;
|
|
|
|
case 2: /* add flex vector */
|
|
{
|
|
FT_Int index;
|
|
FT_Vector* flex;
|
|
|
|
|
|
if ( top[0] != 0 )
|
|
goto Unexpected_OtherSubr;
|
|
|
|
top -= 2;
|
|
if ( top < decoder->stack )
|
|
goto Stack_Underflow;
|
|
|
|
index = decoder->num_flex_vectors++;
|
|
if ( index >= 7 )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: too many flex vectors!\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
flex = decoder->flex_vectors + index;
|
|
flex->x += top[0];
|
|
flex->y += top[1];
|
|
}
|
|
break;
|
|
|
|
case 0: /* end flex feature */
|
|
if ( decoder->flex_state == 0 ||
|
|
decoder->num_flex_vectors != 7 )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: unexpected flex end\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
if ( top[0] != 3 )
|
|
goto Unexpected_OtherSubr;
|
|
|
|
top -= 3;
|
|
if ( top < decoder->stack )
|
|
goto Stack_Underflow;
|
|
|
|
/* now consume the remaining `pop pop setcurrentpoint' */
|
|
if ( ip + 6 > limit ||
|
|
ip[0] != 12 || ip[1] != 17 || /* pop */
|
|
ip[2] != 12 || ip[3] != 17 || /* pop */
|
|
ip[4] != 12 || ip[5] != 33 ) /* setcurrentpoint */
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: invalid flex charstring\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
decoder->flex_state = 0;
|
|
decoder->top = top;
|
|
|
|
error = t1operator_flex( decoder, top[0], top[1], top[2] );
|
|
break;
|
|
|
|
case 3: /* change hints */
|
|
if ( top[0] != 1 )
|
|
goto Unexpected_OtherSubr;
|
|
|
|
/* eat the following `pop' */
|
|
if ( ip + 2 > limit )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: invalid escape (12+%d)\n",
|
|
ip[-1] ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
if ( ip[0] != 12 || ip[1] != 17 )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings:" ));
|
|
FT_ERROR(( " `pop' expected, found (%d %d)\n", ip[0], ip[1] ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
ip += 2;
|
|
|
|
error = hints->change_hints( builder );
|
|
break;
|
|
|
|
default:
|
|
/* invalid OtherSubrs call */
|
|
Unexpected_OtherSubr:
|
|
FT_ERROR(( "T1_Parse_CharStrings: unexpected OtherSubrs [%d %d]\n",
|
|
top[0], top[1] ));
|
|
goto Syntax_Error;
|
|
}
|
|
decoder->top = top;
|
|
}
|
|
else
|
|
{
|
|
FT_Int num_args = args_count[op];
|
|
|
|
|
|
if ( top - decoder->stack < num_args )
|
|
goto Stack_Underflow;
|
|
|
|
top -= num_args;
|
|
|
|
switch ( op )
|
|
{
|
|
case op_endchar:
|
|
error = builds->end_char( builder );
|
|
break;
|
|
|
|
case op_hsbw:
|
|
error = builds->set_bearing_point( builder, top[0], 0,
|
|
top[1], 0 );
|
|
break;
|
|
|
|
case op_seac:
|
|
/* return immediately after the processing */
|
|
return t1operator_seac( decoder, top[0], top[1],
|
|
top[2], top[3], top[4] );
|
|
|
|
case op_sbw:
|
|
error = builds->set_bearing_point( builder, top[0], top[1],
|
|
top[2], top[3] );
|
|
break;
|
|
|
|
case op_closepath:
|
|
error = builds->close_path( builder );
|
|
break;
|
|
|
|
case op_hlineto:
|
|
error = builds->rline_to( builder, top[0], 0 );
|
|
break;
|
|
|
|
case op_hmoveto:
|
|
error = builds->rmove_to( builder, top[0], 0 );
|
|
break;
|
|
|
|
case op_hvcurveto:
|
|
error = builds->rcurve_to( builder, top[0], 0,
|
|
top[1], top[2],
|
|
0, top[3] );
|
|
break;
|
|
|
|
case op_rlineto:
|
|
error = builds->rline_to( builder, top[0], top[1] );
|
|
break;
|
|
|
|
case op_rmoveto:
|
|
/* ignore operator when in flex mode */
|
|
if ( decoder->flex_state == 0 )
|
|
error = builds->rmove_to( builder, top[0], top[1] );
|
|
else
|
|
top += 2;
|
|
break;
|
|
|
|
case op_rrcurveto:
|
|
error = builds->rcurve_to( builder, top[0], top[1],
|
|
top[2], top[3],
|
|
top[4], top[5] );
|
|
break;
|
|
|
|
case op_vhcurveto:
|
|
error = builds->rcurve_to( builder, 0, top[0],
|
|
top[1], top[2],
|
|
top[3], 0 );
|
|
break;
|
|
|
|
case op_vlineto:
|
|
error = builds->rline_to( builder, 0, top[0] );
|
|
break;
|
|
|
|
case op_vmoveto:
|
|
error = builds->rmove_to( builder, 0, top[0] );
|
|
break;
|
|
|
|
case op_dotsection:
|
|
error = hints->dot_section( builder );
|
|
break;
|
|
|
|
case op_hstem:
|
|
error = hints->stem( builder, top[0], top[1], 0 );
|
|
break;
|
|
|
|
case op_hstem3:
|
|
error = hints->stem3( builder, top[0], top[1], top[2],
|
|
top[3], top[4], top[5], 0 );
|
|
break;
|
|
|
|
case op_vstem:
|
|
error = hints->stem( builder, top[0], top[1], 1 );
|
|
break;
|
|
|
|
case op_vstem3:
|
|
error = hints->stem3( builder, top[0], top[1], top[2],
|
|
top[3], top[4], top[5], 1 );
|
|
break;
|
|
|
|
case op_div:
|
|
if ( top[1] )
|
|
{
|
|
*top = top[0] / top[1];
|
|
++top;
|
|
}
|
|
else
|
|
{
|
|
FT_ERROR(( "T1_Parse_CHarStrings: division by 0\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
break;
|
|
|
|
case op_callsubr:
|
|
{
|
|
FT_Int index = top[0];
|
|
|
|
|
|
if ( index < 0 || index >= num_subrs )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: invalid subrs index\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
if ( zone - decoder->zones >= T1_MAX_SUBRS_CALLS )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: too many nested subrs\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
zone->cursor = ip; /* save current instruction pointer */
|
|
|
|
zone++;
|
|
zone->base = subrs_base[index];
|
|
zone->limit = zone->base + subrs_len[index];
|
|
zone->cursor = zone->base;
|
|
|
|
if ( !zone->base )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: invoking empty subrs!\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
decoder->zone = zone;
|
|
ip = zone->base;
|
|
limit = zone->limit;
|
|
}
|
|
break;
|
|
|
|
case op_pop:
|
|
FT_ERROR(( "T1_Parse_CharStrings: unexpected POP\n" ));
|
|
goto Syntax_Error;
|
|
|
|
case op_return:
|
|
if ( zone <= decoder->zones )
|
|
{
|
|
FT_ERROR(( "T1_Parse_CharStrings: unexpected return\n" ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
zone--;
|
|
ip = zone->cursor;
|
|
limit = zone->limit;
|
|
decoder->zone = zone;
|
|
break;
|
|
|
|
case op_setcurrentpoint:
|
|
FT_ERROR(( "T1_Parse_CharStrings:" ));
|
|
FT_ERROR(( " unexpected `setcurrentpoint'\n" ));
|
|
goto Syntax_Error;
|
|
break;
|
|
|
|
default:
|
|
FT_ERROR(( "T1_Parse_CharStrings: unhandled opcode %d\n", op ));
|
|
goto Syntax_Error;
|
|
}
|
|
|
|
decoder->top = top;
|
|
}
|
|
}
|
|
|
|
return error;
|
|
|
|
Syntax_Error:
|
|
return T1_Err_Syntax_Error;
|
|
|
|
Stack_Underflow:
|
|
return T1_Err_Stack_Underflow;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* T1_Add_Points */
|
|
/* */
|
|
/* <Description> */
|
|
/* Checks that there is enough room in the current load glyph outline */
|
|
/* to accept `num_points' additional outline points. If not, this */
|
|
/* function grows the load outline's arrays accordingly. */
|
|
/* */
|
|
/* <Input> */
|
|
/* builder :: A pointer to the glyph builder object. */
|
|
/* */
|
|
/* num_points :: The number of points that will be added later. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function does NOT update the points count in the glyph */
|
|
/* builder. This must be done by the caller itself, after this */
|
|
/* function has been invoked. */
|
|
/* */
|
|
LOCAL_FUNC
|
|
FT_Error T1_Add_Points( T1_Builder* builder,
|
|
FT_Int num_points )
|
|
{
|
|
return FT_GlyphLoader_Check_Points( builder->loader, num_points, 0 );
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* T1_Add_Contours */
|
|
/* */
|
|
/* <Description> */
|
|
/* Checks that there is enough room in the current load glyph outline */
|
|
/* to accept `num_contours' additional contours. If not, this */
|
|
/* function grows the load outline's arrays accordingly. */
|
|
/* */
|
|
/* <Input> */
|
|
/* builder :: A pointer to the glyph builder object. */
|
|
/* */
|
|
/* num_contours :: The number of contours that will be added later. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function does NOT update the contours count in the load glyph */
|
|
/* This must be done by the caller itself, after this function is */
|
|
/* invoked. */
|
|
/* */
|
|
LOCAL_FUNC
|
|
FT_Error T1_Add_Contours( T1_Builder* builder,
|
|
FT_Int num_contours )
|
|
{
|
|
return FT_GlyphLoader_Check_Points( builder->loader, 0, num_contours );
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/********** *********/
|
|
/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
|
|
/********** *********/
|
|
/********** The following code is in charge of computing *********/
|
|
/********** the maximum advance width of the font. It *********/
|
|
/********** quickly processes each glyph charstring to *********/
|
|
/********** extract the value from either a `sbw' or `seac' *********/
|
|
/********** operator. *********/
|
|
/********** *********/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
static
|
|
FT_Error maxadv_sbw( T1_Decoder* decoder,
|
|
FT_Pos sbx,
|
|
FT_Pos sby,
|
|
FT_Pos wx,
|
|
FT_Pos wy )
|
|
{
|
|
FT_UNUSED( sbx );
|
|
FT_UNUSED( sby );
|
|
FT_UNUSED( wy );
|
|
|
|
if ( wx > decoder->builder.advance.x )
|
|
decoder->builder.advance.x = wx;
|
|
|
|
return -1; /* return an error code to exit the Type 1 parser */
|
|
/* immediately. */
|
|
}
|
|
|
|
|
|
static
|
|
FT_Int maxadv_error( void )
|
|
{
|
|
/* we should never reach this code, unless with a buggy font */
|
|
return -2;
|
|
}
|
|
|
|
|
|
/* the maxadv_gbuilder_interface is used when computing the maximum */
|
|
/* advance width of all glyphs in a given font. We only process the */
|
|
/* `sbw' operator here, and return an error for all others. */
|
|
|
|
/* Note that `seac' is processed by the T1_Decoder. */
|
|
static
|
|
const T1_Builder_Funcs maxadv_builder_interface =
|
|
{
|
|
(T1_Builder_EndChar) maxadv_error,
|
|
(T1_Builder_Sbw) maxadv_sbw,
|
|
(T1_Builder_ClosePath)maxadv_error,
|
|
(T1_Builder_RLineTo) maxadv_error,
|
|
(T1_Builder_RMoveTo) maxadv_error,
|
|
(T1_Builder_RCurveTo) maxadv_error
|
|
};
|
|
|
|
|
|
/* the maxadv_hinter_interface always return an error. */
|
|
static
|
|
const T1_Hinter_Funcs maxadv_hinter_interface =
|
|
{
|
|
(T1_Hinter_DotSection) maxadv_error,
|
|
(T1_Hinter_ChangeHints)maxadv_error,
|
|
(T1_Hinter_Stem) maxadv_error,
|
|
(T1_Hinter_Stem3) maxadv_error,
|
|
};
|
|
|
|
|
|
LOCAL_FUNC
|
|
FT_Error T1_Compute_Max_Advance( T1_Face face,
|
|
FT_Int* max_advance )
|
|
{
|
|
FT_Error error;
|
|
T1_Decoder decoder;
|
|
FT_Int glyph_index;
|
|
T1_Font* type1 = &face->type1;
|
|
|
|
|
|
*max_advance = 0;
|
|
|
|
/* Initialize load decoder */
|
|
T1_Init_Decoder( &decoder, &maxadv_hinter_interface );
|
|
|
|
T1_Init_Builder( &decoder.builder, face, 0, 0,
|
|
&maxadv_builder_interface );
|
|
|
|
/* For each glyph, parse the glyph charstring and extract */
|
|
/* the advance width. */
|
|
for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
|
|
{
|
|
/* now get load the unscaled outline */
|
|
error = T1_Parse_CharStrings( &decoder,
|
|
type1->charstrings [glyph_index],
|
|
type1->charstrings_len[glyph_index],
|
|
type1->num_subrs,
|
|
type1->subrs,
|
|
type1->subrs_len );
|
|
/* ignore the error if one occured - skip to next glyph */
|
|
}
|
|
|
|
*max_advance = decoder.builder.advance.x;
|
|
return T1_Err_Ok;
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/********** *********/
|
|
/********** UNHINTED GLYPH LOADER *********/
|
|
/********** *********/
|
|
/********** The following code is in charge of loading a *********/
|
|
/********** single outline. It completely ignores hinting *********/
|
|
/********** and is used when FT_LOAD_NO_HINTING is set. *********/
|
|
/********** *********/
|
|
/********** The Type 1 hinter is located in `t1hint.c' *********/
|
|
/********** *********/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
static
|
|
FT_Error close_open_path( T1_Builder* builder )
|
|
{
|
|
FT_Error error;
|
|
FT_Outline* cur = builder->current;
|
|
FT_Int num_points;
|
|
FT_Int first_point;
|
|
|
|
|
|
/* Some fonts, like Hershey, are made of `open paths' which are */
|
|
/* now managed directly by FreeType. In this case, it is necessary */
|
|
/* to close the path by duplicating its points in reverse order, */
|
|
/* which is precisely the purpose of this function. */
|
|
|
|
/* first compute the number of points to duplicate */
|
|
if ( cur->n_contours > 1 )
|
|
first_point = cur->contours[cur->n_contours - 2] + 1;
|
|
else
|
|
first_point = 0;
|
|
|
|
num_points = cur->n_points - first_point - 2;
|
|
if ( num_points > 0 )
|
|
{
|
|
FT_Vector* source_point;
|
|
char* source_tags;
|
|
FT_Vector* point;
|
|
char* tags;
|
|
|
|
|
|
error = T1_Add_Points( builder, num_points );
|
|
if ( error )
|
|
return error;
|
|
|
|
point = cur->points + cur->n_points;
|
|
tags = cur->tags + cur->n_points;
|
|
|
|
source_point = point - 2;
|
|
source_tags = tags - 2;
|
|
|
|
cur->n_points += num_points;
|
|
|
|
if ( builder->load_points )
|
|
do
|
|
{
|
|
*point++ = *source_point--;
|
|
*tags++ = *source_tags--;
|
|
num_points--;
|
|
|
|
} while ( num_points > 0 );
|
|
}
|
|
|
|
builder->path_begun = 0;
|
|
return T1_Err_Ok;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_closepath( T1_Builder* builder )
|
|
{
|
|
FT_Outline* cur = builder->current;
|
|
|
|
|
|
/* XXXX: We must not include the last point in the path if it */
|
|
/* is located on the first point. */
|
|
if ( cur->n_points > 1 )
|
|
{
|
|
FT_Int first = 0;
|
|
FT_Vector* p1 = cur->points + first;
|
|
FT_Vector* p2 = cur->points + cur->n_points - 1;
|
|
|
|
|
|
if ( cur->n_contours > 1 )
|
|
{
|
|
first = cur->contours[cur->n_contours - 2] + 1;
|
|
p1 = cur->points + first;
|
|
}
|
|
|
|
if ( p1->x == p2->x && p1->y == p2->y )
|
|
cur->n_points--;
|
|
}
|
|
|
|
/* save current contour, if any */
|
|
if ( cur->n_contours > 0 )
|
|
cur->contours[cur->n_contours - 1] = cur->n_points - 1;
|
|
|
|
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
|
|
/* hint last points if necessary -- this is not strictly required */
|
|
/* there, but it helps for debugging, and doesn't affect performance */
|
|
if ( builder->pass == 1 )
|
|
T1_Hint_Points( builder );
|
|
#endif
|
|
|
|
builder->path_begun = 0;
|
|
return T1_Err_Ok;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_endchar( T1_Builder* builder )
|
|
{
|
|
FT_Error error;
|
|
|
|
|
|
/* close path if needed */
|
|
if ( builder->path_begun )
|
|
{
|
|
error = close_open_path( builder );
|
|
if ( error )
|
|
return error;
|
|
}
|
|
|
|
error = gload_closepath( builder );
|
|
|
|
FT_GlyphLoader_Add( builder->loader );
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_sbw( T1_Builder* builder,
|
|
FT_Pos sbx,
|
|
FT_Pos sby,
|
|
FT_Pos wx,
|
|
FT_Pos wy )
|
|
{
|
|
builder->left_bearing.x += sbx;
|
|
builder->left_bearing.y += sby;
|
|
builder->advance.x = wx;
|
|
builder->advance.y = wy;
|
|
|
|
builder->last.x = sbx;
|
|
builder->last.y = sby;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_rlineto( T1_Builder* builder,
|
|
FT_Pos dx,
|
|
FT_Pos dy )
|
|
{
|
|
FT_Error error;
|
|
FT_Outline* cur = builder->current;
|
|
FT_Vector vec;
|
|
|
|
|
|
/* grow buffer if necessary */
|
|
error = T1_Add_Points( builder, 1 );
|
|
if ( error )
|
|
return error;
|
|
|
|
if ( builder->load_points )
|
|
{
|
|
/* save point */
|
|
vec.x = builder->last.x + dx;
|
|
vec.y = builder->last.y + dy;
|
|
|
|
cur->points[cur->n_points] = vec;
|
|
cur->tags [cur->n_points] = FT_Curve_Tag_On;
|
|
|
|
builder->last = vec;
|
|
}
|
|
cur->n_points++;
|
|
|
|
builder->path_begun = 1;
|
|
|
|
return T1_Err_Ok;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_rmoveto( T1_Builder* builder,
|
|
FT_Pos dx,
|
|
FT_Pos dy )
|
|
{
|
|
FT_Error error;
|
|
FT_Outline* cur = builder->current;
|
|
FT_Vector vec;
|
|
|
|
|
|
/* in the case where `path_begun' is set, we have an `rmoveto' */
|
|
/* after some normal path definition. If the face's paint type */
|
|
/* is set to 1, this means that we have an `open path', also */
|
|
/* called a `stroke'. The FreeType raster doesn't support */
|
|
/* opened paths, so we'll close it explicitely there. */
|
|
|
|
if ( builder->path_begun && builder->face->type1.paint_type == 1 )
|
|
{
|
|
if ( builder->face->type1.paint_type == 1 )
|
|
{
|
|
error = close_open_path( builder );
|
|
if ( error )
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/* grow buffer if necessary */
|
|
error = T1_Add_Contours( builder, 1 ) ||
|
|
T1_Add_Points ( builder, 1 );
|
|
if ( error )
|
|
return error;
|
|
|
|
/* save current contour, if any */
|
|
if ( cur->n_contours > 0 )
|
|
cur->contours[cur->n_contours - 1] = cur->n_points - 1;
|
|
|
|
if ( builder->load_points )
|
|
{
|
|
/* save point */
|
|
vec.x = builder->last.x + dx;
|
|
vec.y = builder->last.y + dy;
|
|
cur->points[cur->n_points] = vec;
|
|
cur->tags [cur->n_points] = FT_Curve_Tag_On;
|
|
|
|
builder->last = vec;
|
|
}
|
|
|
|
cur->n_contours++;
|
|
cur->n_points++;
|
|
|
|
return T1_Err_Ok;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_rrcurveto( T1_Builder* builder,
|
|
FT_Pos dx1,
|
|
FT_Pos dy1,
|
|
FT_Pos dx2,
|
|
FT_Pos dy2,
|
|
FT_Pos dx3,
|
|
FT_Pos dy3 )
|
|
{
|
|
FT_Error error;
|
|
FT_Outline* cur = builder->current;
|
|
FT_Vector vec;
|
|
FT_Vector* points;
|
|
char* tags;
|
|
|
|
|
|
/* grow buffer if necessary */
|
|
error = T1_Add_Points( builder, 3 );
|
|
if ( error )
|
|
return error;
|
|
|
|
if ( builder->load_points )
|
|
{
|
|
/* save point */
|
|
points = cur->points + cur->n_points;
|
|
tags = cur->tags + cur->n_points;
|
|
|
|
vec.x = builder->last.x + dx1;
|
|
vec.y = builder->last.y + dy1;
|
|
points[0] = vec;
|
|
tags[0] = FT_Curve_Tag_Cubic;
|
|
|
|
vec.x += dx2;
|
|
vec.y += dy2;
|
|
points[1] = vec;
|
|
tags[1] = FT_Curve_Tag_Cubic;
|
|
|
|
vec.x += dx3;
|
|
vec.y += dy3;
|
|
points[2] = vec;
|
|
tags[2] = FT_Curve_Tag_On;
|
|
|
|
builder->last = vec;
|
|
}
|
|
|
|
cur->n_points += 3;
|
|
builder->path_begun = 1;
|
|
|
|
return T1_Err_Ok;
|
|
}
|
|
|
|
|
|
static
|
|
FT_Error gload_ignore( void )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static
|
|
const T1_Builder_Funcs gload_builder_interface =
|
|
{
|
|
gload_endchar,
|
|
gload_sbw,
|
|
gload_closepath,
|
|
gload_rlineto,
|
|
gload_rmoveto,
|
|
gload_rrcurveto
|
|
};
|
|
|
|
|
|
static
|
|
const T1_Builder_Funcs gload_builder_interface_null =
|
|
{
|
|
(T1_Builder_EndChar) gload_ignore,
|
|
(T1_Builder_Sbw) gload_sbw, /* record left bearing */
|
|
(T1_Builder_ClosePath)gload_ignore,
|
|
(T1_Builder_RLineTo) gload_ignore,
|
|
(T1_Builder_RMoveTo) gload_ignore,
|
|
(T1_Builder_RCurveTo) gload_ignore
|
|
};
|
|
|
|
|
|
static
|
|
const T1_Hinter_Funcs gload_hinter_interface =
|
|
{
|
|
(T1_Hinter_DotSection) gload_ignore, /* dotsection */
|
|
(T1_Hinter_ChangeHints)gload_ignore, /* changehints */
|
|
(T1_Hinter_Stem) gload_ignore, /* hstem & vstem */
|
|
(T1_Hinter_Stem3) gload_ignore, /* hstem3 & vestem3 */
|
|
};
|
|
|
|
|
|
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* Hinter overview: */
|
|
/* */
|
|
/* This is a two-pass hinter. On the first pass, the hints are all */
|
|
/* recorded by the hinter, and no point is loaded in the outline. */
|
|
/* */
|
|
/* When the first pass is finished, all stems hints are grid-fitted */
|
|
/* at once. */
|
|
/* */
|
|
/* Then, a second pass is performed to load the outline points as */
|
|
/* well as hint/scale them correctly. */
|
|
/* */
|
|
/*************************************************************************/
|
|
|
|
|
|
static
|
|
FT_Error t1_load_hinted_glyph( T1_Decoder* decoder,
|
|
FT_UInt glyph_index,
|
|
FT_Bool recurse )
|
|
{
|
|
T1_Builder* builder = &decoder->builder;
|
|
T1_GlyphSlot glyph = builder->glyph;
|
|
T1_Font* type1 = &builder->face->type1;
|
|
FT_UInt old_points, old_contours;
|
|
FT_GlyphLoader* loader = decoder->builder.loader;
|
|
FT_Error error;
|
|
|
|
|
|
/* Pass 1 -- try to load first glyph, simply recording points */
|
|
old_points = loader->base.outline.n_points;
|
|
old_contours = loader->base.outline.n_contours;
|
|
|
|
FT_GlyphLoader_Prepare( decoder->builder.loader );
|
|
|
|
T1_Reset_Builder( builder, 0 );
|
|
|
|
builder->no_recurse = recurse;
|
|
builder->pass = 0;
|
|
glyph->hints->hori_stems.num_stems = 0;
|
|
glyph->hints->vert_stems.num_stems = 0;
|
|
|
|
error = T1_Parse_CharStrings( decoder,
|
|
type1->charstrings [glyph_index],
|
|
type1->charstrings_len[glyph_index],
|
|
type1->num_subrs,
|
|
type1->subrs,
|
|
type1->subrs_len );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* check for composite (i.e. `seac' operator) */
|
|
if ( glyph->root.format == ft_glyph_format_composite )
|
|
{
|
|
/* this is a composite glyph, we must then load the first one, */
|
|
/* then load the second one on top of it and translate it by a */
|
|
/* fixed amount. */
|
|
FT_UInt n_base_points;
|
|
FT_SubGlyph* subglyph = loader->base.subglyphs;
|
|
T1_Size size = builder->size;
|
|
FT_Pos dx, dy;
|
|
FT_Vector left_bearing, advance;
|
|
|
|
|
|
/* clean glyph format */
|
|
glyph->root.format = ft_glyph_format_none;
|
|
|
|
/* First load `bchar' in builder */
|
|
builder->no_recurse = 0;
|
|
error = t1_load_hinted_glyph( decoder, subglyph->index, 0 );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* save the left bearing and width of the base character */
|
|
/* as they will be erased by the next load */
|
|
left_bearing = builder->left_bearing;
|
|
advance = builder->advance;
|
|
|
|
/* Then load `achar' in builder */
|
|
n_base_points = builder->base->n_points;
|
|
subglyph++;
|
|
error = t1_load_hinted_glyph( decoder, subglyph->index, 0 );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* Finally, move the accent */
|
|
dx = FT_MulFix( subglyph->arg1, size->root.metrics.x_scale );
|
|
dy = FT_MulFix( subglyph->arg2, size->root.metrics.y_scale );
|
|
dx = ( dx + 32 ) & -64;
|
|
dy = ( dy + 32 ) & -64;
|
|
{
|
|
FT_Outline dummy;
|
|
|
|
|
|
dummy.n_points = loader->base.outline.n_points - n_base_points;
|
|
dummy.points = loader->base.outline.points + n_base_points;
|
|
|
|
FT_Outline_Translate( &dummy, dx, dy );
|
|
}
|
|
|
|
/* restore the left side bearing and */
|
|
/* advance width of the base character */
|
|
builder->left_bearing = left_bearing;
|
|
builder->advance = advance;
|
|
}
|
|
else
|
|
{
|
|
/* All right, pass 1 is finished, now grid-fit all stem hints */
|
|
T1_Hint_Stems( &decoder->builder );
|
|
|
|
/* undo the end-char */
|
|
builder->base->n_points = old_points;
|
|
builder->base->n_contours = old_contours;
|
|
|
|
/* Pass 2 -- record and scale/hint the points */
|
|
T1_Reset_Builder( builder, 0 );
|
|
|
|
builder->pass = 1;
|
|
builder->no_recurse = 0;
|
|
|
|
error = T1_Parse_CharStrings( decoder,
|
|
type1->charstrings [glyph_index],
|
|
type1->charstrings_len[glyph_index],
|
|
type1->num_subrs,
|
|
type1->subrs,
|
|
type1->subrs_len );
|
|
}
|
|
|
|
/* save new glyph tables */
|
|
if ( recurse )
|
|
T1_Done_Builder( builder );
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
#endif /* !T1_CONFIG_OPTION_DISABLE_HINTER */
|
|
|
|
|
|
LOCAL_FUNC
|
|
FT_Error T1_Load_Glyph( T1_GlyphSlot glyph,
|
|
T1_Size size,
|
|
FT_Int glyph_index,
|
|
FT_Int load_flags )
|
|
{
|
|
FT_Error error;
|
|
T1_Decoder decoder;
|
|
T1_Face face = (T1_Face)glyph->root.face;
|
|
FT_Bool hinting;
|
|
T1_Font* type1 = &face->type1;
|
|
|
|
|
|
if ( load_flags & FT_LOAD_NO_RECURSE )
|
|
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
|
|
|
|
glyph->x_scale = size->root.metrics.x_scale;
|
|
glyph->y_scale = size->root.metrics.y_scale;
|
|
|
|
glyph->root.outline.n_points = 0;
|
|
glyph->root.outline.n_contours = 0;
|
|
|
|
glyph->root.format = ft_glyph_format_outline; /* by default */
|
|
|
|
hinting = 0;
|
|
|
|
#ifndef T1_CONFIG_OPTION_DISABLE_HINTER
|
|
|
|
hinting = ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING ) ) == 0;
|
|
|
|
if ( hinting )
|
|
{
|
|
T1_Init_Decoder( &decoder, &t1_hinter_funcs );
|
|
T1_Init_Builder( &decoder.builder, face, size, glyph,
|
|
&gload_builder_interface );
|
|
|
|
error = t1_load_hinted_glyph( &decoder, glyph_index, 1 );
|
|
}
|
|
else
|
|
|
|
#endif /* !T1_CONFIG_OPTION_DISABLE_HINTER */
|
|
|
|
{
|
|
T1_Init_Decoder( &decoder, &gload_hinter_interface );
|
|
|
|
T1_Init_Builder( &decoder.builder, face, size, glyph,
|
|
&gload_builder_interface );
|
|
|
|
decoder.builder.no_recurse = ( load_flags & FT_LOAD_NO_RECURSE ) != 0;
|
|
|
|
/* now load the unscaled outline */
|
|
error = T1_Parse_CharStrings( &decoder,
|
|
type1->charstrings [glyph_index],
|
|
type1->charstrings_len[glyph_index],
|
|
type1->num_subrs,
|
|
type1->subrs,
|
|
type1->subrs_len );
|
|
|
|
/* save new glyph tables */
|
|
T1_Done_Builder( &decoder.builder );
|
|
}
|
|
|
|
/* Now, set the metrics -- this is rather simple, as */
|
|
/* the left side bearing is the xMin, and the top side */
|
|
/* bearing the yMax */
|
|
if ( !error )
|
|
{
|
|
/* for composite glyphs, return only the left side bearing and the */
|
|
/* advance width */
|
|
if ( glyph->root.format == ft_glyph_format_composite )
|
|
{
|
|
glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
|
|
glyph->root.metrics.horiAdvance = decoder.builder.advance.x;
|
|
}
|
|
else
|
|
{
|
|
FT_BBox cbox;
|
|
FT_Glyph_Metrics* metrics = &glyph->root.metrics;
|
|
|
|
|
|
/* apply the font matrix */
|
|
FT_Outline_Transform( &glyph->root.outline,
|
|
&face->type1.font_matrix );
|
|
|
|
FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
|
|
|
|
/* grid fit the bounding box if necessary */
|
|
if ( hinting )
|
|
{
|
|
cbox.xMin &= -64;
|
|
cbox.yMin &= -64;
|
|
cbox.xMax = ( cbox.xMax + 63 ) & -64;
|
|
cbox.yMax = ( cbox.yMax + 63 ) & -64;
|
|
}
|
|
|
|
metrics->width = cbox.xMax - cbox.xMin;
|
|
metrics->height = cbox.yMax - cbox.yMin;
|
|
|
|
metrics->horiBearingX = cbox.xMin;
|
|
metrics->horiBearingY = cbox.yMax;
|
|
|
|
/* copy the _unscaled_ advance width */
|
|
metrics->horiAdvance = decoder.builder.advance.x;
|
|
|
|
/* make up vertical metrics */
|
|
metrics->vertBearingX = 0;
|
|
metrics->vertBearingY = 0;
|
|
metrics->vertAdvance = 0;
|
|
|
|
glyph->root.format = ft_glyph_format_outline;
|
|
|
|
glyph->root.outline.flags = 0;
|
|
|
|
if ( size->root.metrics.y_ppem < 24 )
|
|
glyph->root.outline.flags |= ft_outline_high_precision;
|
|
|
|
glyph->root.outline.flags |= ft_outline_reverse_fill;
|
|
|
|
if ( hinting )
|
|
{
|
|
/* adjust the advance width */
|
|
/* XXX TODO: consider stem hints grid-fit */
|
|
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
|
|
glyph->x_scale );
|
|
}
|
|
else if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
|
|
{
|
|
/* scale the outline and the metrics */
|
|
FT_Int n;
|
|
FT_Outline* cur = decoder.builder.base;
|
|
FT_Vector* vec = cur->points;
|
|
FT_Fixed x_scale = glyph->x_scale;
|
|
FT_Fixed y_scale = glyph->y_scale;
|
|
|
|
|
|
/* First of all, scale the points */
|
|
for ( n = cur->n_points; n > 0; n--, vec++ )
|
|
{
|
|
vec->x = FT_MulFix( vec->x, x_scale );
|
|
vec->y = FT_MulFix( vec->y, y_scale );
|
|
}
|
|
|
|
/* Then scale the metrics */
|
|
metrics->width = FT_MulFix( metrics->width, x_scale );
|
|
metrics->height = FT_MulFix( metrics->height, y_scale );
|
|
|
|
metrics->horiBearingX = FT_MulFix( metrics->horiBearingX, x_scale );
|
|
metrics->horiBearingY = FT_MulFix( metrics->horiBearingY, y_scale );
|
|
|
|
metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
|
|
metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
|
|
|
|
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
|
|
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
|
|
}
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/* END */
|