--- /dev/null
+/***************************************************************************/
+/* */
+/* t1gload.c */
+/* */
+/* Type 1 Glyph Loader (body). */
+/* */
+/* Copyright 1996-2001 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+
+#include <ft2build.h>
+#include "t1gload.h"
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_STREAM_H
+#include FT_OUTLINE_H
+#include FT_INTERNAL_POSTSCRIPT_AUX_H
+
+#include "t1errors.h"
+
+#include <string.h> /* for strcmp() */
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_t1gload
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /********** *********/
+ /********** 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. *********/
+ /********** *********/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ FT_CALLBACK_DEF( FT_Error )
+ T1_Parse_Glyph( T1_Decoder* decoder,
+ FT_UInt glyph_index )
+ {
+ T1_Face face = (T1_Face)decoder->builder.face;
+ T1_Font* type1 = &face->type1;
+
+
+ decoder->font_matrix = type1->font_matrix;
+ decoder->font_offset = type1->font_offset;
+
+ return decoder->funcs.parse_charstrings(
+ decoder,
+ type1->charstrings [glyph_index],
+ type1->charstrings_len[glyph_index] );
+ }
+
+
+ FT_LOCAL_DEF 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;
+ PSAux_Interface* psaux = (PSAux_Interface*)face->psaux;
+
+
+ *max_advance = 0;
+
+ /* initialize load decoder */
+ error = psaux->t1_decoder_funcs->init( &decoder,
+ (FT_Face)face,
+ 0, /* size */
+ 0, /* glyph slot */
+ (FT_Byte**)type1->glyph_names,
+ face->blend,
+ T1_Parse_Glyph );
+ if ( error )
+ return error;
+
+ decoder.builder.metrics_only = 1;
+ decoder.builder.load_points = 0;
+
+ decoder.num_subrs = type1->num_subrs;
+ decoder.subrs = type1->subrs;
+ decoder.subrs_len = type1->subrs_len;
+
+ /* 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_Glyph( &decoder, glyph_index );
+ /* 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' *********/
+ /********** *********/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ FT_LOCAL_DEF 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;
+ PSAux_Interface* psaux = (PSAux_Interface*)face->psaux;
+ const T1_Decoder_Funcs* decoder_funcs = psaux->t1_decoder_funcs;
+
+ FT_Matrix font_matrix;
+ FT_Vector font_offset;
+
+ 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;
+
+ hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
+ ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
+
+ glyph->root.format = ft_glyph_format_outline;
+
+ error = decoder_funcs->init( &decoder,
+ (FT_Face)face,
+ (FT_Size)size,
+ (FT_GlyphSlot)glyph,
+ (FT_Byte**)type1->glyph_names,
+ face->blend,
+ T1_Parse_Glyph );
+ if ( error )
+ goto Exit;
+
+ decoder.builder.no_recurse = FT_BOOL(
+ ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
+
+ decoder.num_subrs = type1->num_subrs;
+ decoder.subrs = type1->subrs;
+ decoder.subrs_len = type1->subrs_len;
+
+
+ /* now load the unscaled outline */
+ error = T1_Parse_Glyph( &decoder, glyph_index );
+ if ( error )
+ goto Exit;
+
+ font_matrix = decoder.font_matrix;
+ font_offset = decoder.font_offset;
+
+ /* save new glyph tables */
+ decoder_funcs->done( &decoder );
+
+ /* 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 )
+ {
+ glyph->root.outline.flags &= ft_outline_owner;
+ glyph->root.outline.flags |= ft_outline_reverse_fill;
+
+ /* for composite glyphs, return only left side bearing and */
+ /* advance width */
+ if ( load_flags & FT_LOAD_NO_RECURSE )
+ {
+ FT_Slot_Internal internal = glyph->root.internal;
+
+
+ glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
+ glyph->root.metrics.horiAdvance = decoder.builder.advance.x;
+ internal->glyph_matrix = font_matrix;
+ internal->glyph_delta = font_offset;
+ internal->glyph_transformed = 1;
+ }
+ else
+ {
+ FT_BBox cbox;
+ FT_Glyph_Metrics* metrics = &glyph->root.metrics;
+
+
+ /* copy the _unscaled_ advance width */
+ metrics->horiAdvance = decoder.builder.advance.x;
+ glyph->root.linearHoriAdvance = decoder.builder.advance.x;
+ glyph->root.internal->glyph_transformed = 0;
+
+ /* make up vertical metrics */
+ metrics->vertBearingX = 0;
+ metrics->vertBearingY = 0;
+ metrics->vertAdvance = 0;
+
+ glyph->root.linearVertAdvance = 0;
+
+ glyph->root.format = ft_glyph_format_outline;
+
+ if ( size && size->root.metrics.y_ppem < 24 )
+ glyph->root.outline.flags |= ft_outline_high_precision;
+
+ /* apply the font matrix */
+ FT_Outline_Transform( &glyph->root.outline, &font_matrix );
+
+ FT_Outline_Translate( &glyph->root.outline,
+ font_offset.x,
+ font_offset.y );
+
+#if 0
+
+ glyph->root.outline.second_pass = TRUE;
+ glyph->root.outline.high_precision = size->root.metrics.y_ppem < 24;
+ glyph->root.outline.dropout_mode = 2;
+
+#endif /* 0 */
+
+ 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 );
+ }
+
+ FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
+
+ /* Then scale the metrics */
+ metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
+ metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
+
+ metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
+ metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
+ }
+
+ /* compute the other metrics */
+ 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;
+ }
+
+ /* Set control data to the glyph charstrings. Note that this is */
+ /* _not_ zero-terminated. */
+ glyph->root.control_data = type1->charstrings [glyph_index];
+ glyph->root.control_len = type1->charstrings_len[glyph_index];
+ }
+
+ Exit:
+ return error;
+ }
+
+
+/* END */