--- /dev/null
+/***************************************************************************/
+/* */
+/* cidgload.c */
+/* */
+/* CID-keyed Type1 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 "cidload.h"
+#include "cidgload.h"
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_STREAM_H
+#include FT_OUTLINE_H
+
+#include "ciderrs.h"
+
+
+ /*************************************************************************/
+ /* */
+ /* 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_cidgload
+
+
+ FT_CALLBACK_DEF( FT_Error )
+ cid_load_glyph( T1_Decoder* decoder,
+ FT_UInt glyph_index )
+ {
+ CID_Face face = (CID_Face)decoder->builder.face;
+ CID_Info* cid = &face->cid;
+ FT_Byte* p;
+ FT_UInt entry_len = cid->fd_bytes + cid->gd_bytes;
+ FT_UInt fd_select;
+ FT_ULong off1, glyph_len;
+ FT_Stream stream = face->root.stream;
+ FT_Error error = 0;
+
+
+ /* read the CID font dict index and charstring offset from the CIDMap */
+ if ( FILE_Seek( cid->data_offset + cid->cidmap_offset +
+ glyph_index * entry_len ) ||
+ ACCESS_Frame( 2 * entry_len ) )
+ goto Exit;
+
+ p = (FT_Byte*)stream->cursor;
+ fd_select = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
+ off1 = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
+ p += cid->fd_bytes;
+ glyph_len = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
+
+ FORGET_Frame();
+
+ /* now, if the glyph is not empty, set up the subrs array, and parse */
+ /* the charstrings */
+ if ( glyph_len > 0 )
+ {
+ CID_FontDict* dict;
+ CID_Subrs* cid_subrs = face->subrs + fd_select;
+ FT_Byte* charstring;
+ FT_Memory memory = face->root.memory;
+
+
+ /* setup subrs */
+ decoder->num_subrs = cid_subrs->num_subrs;
+ decoder->subrs = cid_subrs->code;
+ decoder->subrs_len = 0;
+
+ /* setup font matrix */
+ dict = cid->font_dicts + fd_select;
+
+ decoder->font_matrix = dict->font_matrix;
+ decoder->font_offset = dict->font_offset;
+ decoder->lenIV = dict->private_dict.lenIV;
+
+ /* the charstrings are encoded (stupid!) */
+ /* load the charstrings, then execute it */
+
+ if ( ALLOC( charstring, glyph_len ) )
+ goto Exit;
+
+ if ( !FILE_Read_At( cid->data_offset + off1, charstring, glyph_len ) )
+ {
+ FT_Int cs_offset;
+
+
+ /* Adjustment for seed bytes. */
+ cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
+
+ /* Decrypt only if lenIV >= 0. */
+ if ( decoder->lenIV >= 0 )
+ cid_decrypt( charstring, glyph_len, 4330 );
+
+ error = decoder->funcs.parse_charstrings( decoder,
+ charstring + cs_offset,
+ glyph_len - cs_offset );
+ }
+
+ FREE( charstring );
+ }
+
+ Exit:
+ return error;
+ }
+
+
+#if 0
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /********** *********/
+ /********** *********/
+ /********** 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_LOCAL_DEF FT_Error
+ CID_Compute_Max_Advance( CID_Face face,
+ FT_Int* max_advance )
+ {
+ FT_Error error;
+ T1_Decoder decoder;
+ FT_Int glyph_index;
+
+ 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 */
+ 0, /* glyph names! XXX */
+ 0, /* blend == 0 */
+ cid_load_glyph );
+ if ( error )
+ return error;
+
+ decoder.builder.metrics_only = 1;
+ decoder.builder.load_points = 0;
+
+ /* for each glyph, parse the glyph charstring and extract */
+ /* the advance width */
+ for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
+ glyph_index++ )
+ {
+ /* now get load the unscaled outline */
+ error = cid_load_glyph( &decoder, glyph_index );
+ /* ignore the error if one occurred - skip to next glyph */
+ }
+
+ *max_advance = decoder.builder.advance.x;
+
+ return CID_Err_Ok;
+ }
+
+
+#endif /* 0 */
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /********** *********/
+ /********** *********/
+ /********** 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. *********/
+ /********** *********/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ FT_LOCAL_DEF FT_Error
+ CID_Load_Glyph( CID_GlyphSlot glyph,
+ CID_Size size,
+ FT_Int glyph_index,
+ FT_Int load_flags )
+ {
+ FT_Error error;
+ T1_Decoder decoder;
+ CID_Face face = (CID_Face)glyph->root.face;
+ FT_Bool hinting;
+
+ PSAux_Interface* psaux = (PSAux_Interface*)face->psaux;
+ 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 = psaux->t1_decoder_funcs->init( &decoder,
+ (FT_Face)face,
+ (FT_Size)size,
+ (FT_GlyphSlot)glyph,
+ 0, /* glyph names -- XXX */
+ 0, /* blend == 0 */
+ cid_load_glyph );
+
+ /* set up the decoder */
+ decoder.builder.no_recurse = FT_BOOL(
+ ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) );
+
+ error = cid_load_glyph( &decoder, glyph_index );
+
+ font_matrix = decoder.font_matrix;
+ font_offset = decoder.font_offset;
+
+ /* save new glyph tables */
+ psaux->t1_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 ( ( 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;
+ }
+ }
+ return error;
+ }
+
+
+/* END */
projects / rrdtool.git / blobdiff