| /***************************************************************************/ |
| /* */ |
| /* 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, |
| 0, |
| 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, |
| FT_BOOL( hinting ), |
| 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; |
| |
| #if 1 |
| /* apply the font matrix, if any */ |
| FT_Outline_Transform( &glyph->root.outline, &font_matrix ); |
| |
| FT_Outline_Translate( &glyph->root.outline, |
| font_offset.x, |
| font_offset.y ); |
| #endif |
| |
| 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, if we are not hinting */ |
| if ( !hinting ) |
| 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 ); |
| |
| if ( hinting ) |
| { |
| metrics->horiAdvance = ( metrics->horiAdvance + 32 ) & -64; |
| metrics->vertAdvance = ( metrics->vertAdvance + 32 ) & -64; |
| |
| metrics->vertBearingX = ( metrics->vertBearingX + 32 ) & -64; |
| metrics->vertBearingY = ( metrics->vertBearingY + 32 ) & -64; |
| } |
| } |
| |
| /* 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 */ |
