ref: 5aa2a5c34a40aff4e3c9fc01660f1ac020125eda
dir: /src/pfr/pfrobjs.c/
/****************************************************************************
*
* pfrobjs.c
*
* FreeType PFR object methods (body).
*
* Copyright (C) 2002-2021 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 "pfrobjs.h"
#include "pfrload.h"
#include "pfrgload.h"
#include "pfrcmap.h"
#include "pfrsbit.h"
#include <freetype/ftoutln.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftcalc.h>
#include <freetype/ttnameid.h>
#include "pfrerror.h"
#undef FT_COMPONENT
#define FT_COMPONENT pfr
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FACE OBJECT METHODS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
pfr_face_done( FT_Face pfrface ) /* PFR_Face */
{
PFR_Face face = (PFR_Face)pfrface;
FT_Memory memory;
if ( !face )
return;
memory = pfrface->driver->root.memory;
/* we don't want dangling pointers */
pfrface->family_name = NULL;
pfrface->style_name = NULL;
/* finalize the physical font record */
pfr_phy_font_done( &face->phy_font, FT_FACE_MEMORY( face ) );
/* no need to finalize the logical font or the header */
FT_FREE( pfrface->available_sizes );
}
FT_LOCAL_DEF( FT_Error )
pfr_face_init( FT_Stream stream,
FT_Face pfrface,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
PFR_Face face = (PFR_Face)pfrface;
FT_Error error;
FT_UNUSED( num_params );
FT_UNUSED( params );
FT_TRACE2(( "PFR driver\n" ));
/* load the header and check it */
error = pfr_header_load( &face->header, stream );
if ( error )
{
FT_TRACE2(( " not a PFR font\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
if ( !pfr_header_check( &face->header ) )
{
FT_TRACE2(( " not a PFR font\n" ));
error = FT_THROW( Unknown_File_Format );
goto Exit;
}
/* check face index */
{
FT_Long num_faces;
error = pfr_log_font_count( stream,
face->header.log_dir_offset,
&num_faces );
if ( error )
goto Exit;
pfrface->num_faces = num_faces;
}
if ( face_index < 0 )
goto Exit;
if ( ( face_index & 0xFFFF ) >= pfrface->num_faces )
{
FT_ERROR(( "pfr_face_init: invalid face index\n" ));
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* load the face */
error = pfr_log_font_load(
&face->log_font,
stream,
(FT_UInt)( face_index & 0xFFFF ),
face->header.log_dir_offset,
FT_BOOL( face->header.phy_font_max_size_high ) );
if ( error )
goto Exit;
/* now load the physical font descriptor */
error = pfr_phy_font_load( &face->phy_font, stream,
face->log_font.phys_offset,
face->log_font.phys_size );
if ( error )
goto Exit;
/* now set up all root face fields */
{
PFR_PhyFont phy_font = &face->phy_font;
pfrface->face_index = face_index & 0xFFFF;
pfrface->num_glyphs = (FT_Long)phy_font->num_chars + 1;
pfrface->face_flags |= FT_FACE_FLAG_SCALABLE;
/* if gps_offset == 0 for all characters, we */
/* assume that the font only contains bitmaps */
{
FT_UInt nn;
for ( nn = 0; nn < phy_font->num_chars; nn++ )
if ( phy_font->chars[nn].gps_offset != 0 )
break;
if ( nn == phy_font->num_chars )
{
if ( phy_font->num_strikes > 0 )
pfrface->face_flags = 0; /* not scalable */
else
{
FT_ERROR(( "pfr_face_init: font doesn't contain glyphs\n" ));
error = FT_THROW( Invalid_File_Format );
goto Exit;
}
}
}
if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 )
pfrface->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
if ( phy_font->flags & PFR_PHY_VERTICAL )
pfrface->face_flags |= FT_FACE_FLAG_VERTICAL;
else
pfrface->face_flags |= FT_FACE_FLAG_HORIZONTAL;
if ( phy_font->num_strikes > 0 )
pfrface->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
if ( phy_font->num_kern_pairs > 0 )
pfrface->face_flags |= FT_FACE_FLAG_KERNING;
/* If no family name was found in the `undocumented' auxiliary
* data, use the font ID instead. This sucks but is better than
* nothing.
*/
pfrface->family_name = phy_font->family_name;
if ( !pfrface->family_name )
pfrface->family_name = phy_font->font_id;
/* note that the style name can be NULL in certain PFR fonts,
* probably meaning `Regular'
*/
pfrface->style_name = phy_font->style_name;
pfrface->num_fixed_sizes = 0;
pfrface->available_sizes = NULL;
pfrface->bbox = phy_font->bbox;
pfrface->units_per_EM = (FT_UShort)phy_font->outline_resolution;
pfrface->ascender = (FT_Short) phy_font->bbox.yMax;
pfrface->descender = (FT_Short) phy_font->bbox.yMin;
pfrface->height = (FT_Short)( ( pfrface->units_per_EM * 12 ) / 10 );
if ( pfrface->height < pfrface->ascender - pfrface->descender )
pfrface->height = (FT_Short)(pfrface->ascender - pfrface->descender);
if ( phy_font->num_strikes > 0 )
{
FT_UInt n, count = phy_font->num_strikes;
FT_Bitmap_Size* size;
PFR_Strike strike;
FT_Memory memory = pfrface->stream->memory;
if ( FT_QNEW_ARRAY( pfrface->available_sizes, count ) )
goto Exit;
size = pfrface->available_sizes;
strike = phy_font->strikes;
for ( n = 0; n < count; n++, size++, strike++ )
{
size->height = (FT_Short)strike->y_ppm;
size->width = (FT_Short)strike->x_ppm;
size->size = (FT_Pos)( strike->y_ppm << 6 );
size->x_ppem = (FT_Pos)( strike->x_ppm << 6 );
size->y_ppem = (FT_Pos)( strike->y_ppm << 6 );
}
pfrface->num_fixed_sizes = (FT_Int)count;
}
/* now compute maximum advance width */
if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 )
pfrface->max_advance_width = (FT_Short)phy_font->standard_advance;
else
{
FT_Int max = 0;
FT_UInt count = phy_font->num_chars;
PFR_Char gchar = phy_font->chars;
for ( ; count > 0; count--, gchar++ )
{
if ( max < gchar->advance )
max = gchar->advance;
}
pfrface->max_advance_width = (FT_Short)max;
}
pfrface->max_advance_height = pfrface->height;
pfrface->underline_position = (FT_Short)( -pfrface->units_per_EM / 10 );
pfrface->underline_thickness = (FT_Short)( pfrface->units_per_EM / 30 );
/* create charmap */
{
FT_CharMapRec charmap;
charmap.face = pfrface;
charmap.platform_id = TT_PLATFORM_MICROSOFT;
charmap.encoding_id = TT_MS_ID_UNICODE_CS;
charmap.encoding = FT_ENCODING_UNICODE;
error = FT_CMap_New( &pfr_cmap_class_rec, NULL, &charmap, NULL );
}
/* check whether we have loaded any kerning pairs */
if ( phy_font->num_kern_pairs )
pfrface->face_flags |= FT_FACE_FLAG_KERNING;
}
Exit:
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SLOT OBJECT METHOD *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( FT_Error )
pfr_slot_init( FT_GlyphSlot pfrslot ) /* PFR_Slot */
{
PFR_Slot slot = (PFR_Slot)pfrslot;
FT_GlyphLoader loader = pfrslot->internal->loader;
pfr_glyph_init( &slot->glyph, loader );
return 0;
}
FT_LOCAL_DEF( void )
pfr_slot_done( FT_GlyphSlot pfrslot ) /* PFR_Slot */
{
PFR_Slot slot = (PFR_Slot)pfrslot;
pfr_glyph_done( &slot->glyph );
}
FT_LOCAL_DEF( FT_Error )
pfr_slot_load( FT_GlyphSlot pfrslot, /* PFR_Slot */
FT_Size pfrsize, /* PFR_Size */
FT_UInt gindex,
FT_Int32 load_flags )
{
PFR_Slot slot = (PFR_Slot)pfrslot;
PFR_Size size = (PFR_Size)pfrsize;
FT_Error error;
PFR_Face face = (PFR_Face)pfrslot->face;
PFR_Char gchar;
FT_Outline* outline = &pfrslot->outline;
FT_ULong gps_offset;
FT_TRACE1(( "pfr_slot_load: glyph index %d\n", gindex ));
if ( gindex > 0 )
gindex--;
if ( !face || gindex >= face->phy_font.num_chars )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* try to load an embedded bitmap */
if ( ( load_flags & ( FT_LOAD_NO_SCALE | FT_LOAD_NO_BITMAP ) ) == 0 )
{
error = pfr_slot_load_bitmap(
slot,
size,
gindex,
( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) != 0 );
if ( !error )
goto Exit;
}
if ( load_flags & FT_LOAD_SBITS_ONLY )
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
gchar = face->phy_font.chars + gindex;
pfrslot->format = FT_GLYPH_FORMAT_OUTLINE;
outline->n_points = 0;
outline->n_contours = 0;
gps_offset = face->header.gps_section_offset;
/* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */
error = pfr_glyph_load( &slot->glyph, face->root.stream,
gps_offset, gchar->gps_offset, gchar->gps_size );
if ( !error )
{
FT_BBox cbox;
FT_Glyph_Metrics* metrics = &pfrslot->metrics;
FT_Pos advance;
FT_UInt em_metrics, em_outline;
FT_Bool scaling;
scaling = FT_BOOL( !( load_flags & FT_LOAD_NO_SCALE ) );
/* copy outline data */
*outline = slot->glyph.loader->base.outline;
outline->flags &= ~FT_OUTLINE_OWNER;
outline->flags |= FT_OUTLINE_REVERSE_FILL;
if ( pfrsize->metrics.y_ppem < 24 )
outline->flags |= FT_OUTLINE_HIGH_PRECISION;
/* compute the advance vector */
metrics->horiAdvance = 0;
metrics->vertAdvance = 0;
advance = gchar->advance;
em_metrics = face->phy_font.metrics_resolution;
em_outline = face->phy_font.outline_resolution;
if ( em_metrics != em_outline )
advance = FT_MulDiv( advance,
(FT_Long)em_outline,
(FT_Long)em_metrics );
if ( face->phy_font.flags & PFR_PHY_VERTICAL )
metrics->vertAdvance = advance;
else
metrics->horiAdvance = advance;
pfrslot->linearHoriAdvance = metrics->horiAdvance;
pfrslot->linearVertAdvance = metrics->vertAdvance;
/* make up vertical metrics(?) */
metrics->vertBearingX = 0;
metrics->vertBearingY = 0;
#if 0 /* some fonts seem to be broken here! */
/* Apply the font matrix, if any. */
/* TODO: Test existing fonts with unusual matrix */
/* whether we have to adjust Units per EM. */
{
FT_Matrix font_matrix;
font_matrix.xx = face->log_font.matrix[0] << 8;
font_matrix.yx = face->log_font.matrix[1] << 8;
font_matrix.xy = face->log_font.matrix[2] << 8;
font_matrix.yy = face->log_font.matrix[3] << 8;
FT_Outline_Transform( outline, &font_matrix );
}
#endif
/* scale when needed */
if ( scaling )
{
FT_Int n;
FT_Fixed x_scale = pfrsize->metrics.x_scale;
FT_Fixed y_scale = pfrsize->metrics.y_scale;
FT_Vector* vec = outline->points;
/* scale outline points */
for ( n = 0; n < outline->n_points; n++, vec++ )
{
vec->x = FT_MulFix( vec->x, x_scale );
vec->y = FT_MulFix( vec->y, y_scale );
}
/* scale the advance */
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
}
/* compute the rest of the metrics */
FT_Outline_Get_CBox( outline, &cbox );
metrics->width = cbox.xMax - cbox.xMin;
metrics->height = cbox.yMax - cbox.yMin;
metrics->horiBearingX = cbox.xMin;
metrics->horiBearingY = cbox.yMax - metrics->height;
}
Exit:
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** KERNING METHOD *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( FT_Error )
pfr_face_get_kerning( FT_Face pfrface, /* PFR_Face */
FT_UInt glyph1,
FT_UInt glyph2,
FT_Vector* kerning )
{
PFR_Face face = (PFR_Face)pfrface;
FT_Error error = FT_Err_Ok;
PFR_PhyFont phy_font = &face->phy_font;
FT_UInt32 code1, code2, pair;
kerning->x = 0;
kerning->y = 0;
if ( glyph1 > 0 )
glyph1--;
if ( glyph2 > 0 )
glyph2--;
/* convert glyph indices to character codes */
if ( glyph1 > phy_font->num_chars ||
glyph2 > phy_font->num_chars )
goto Exit;
code1 = phy_font->chars[glyph1].char_code;
code2 = phy_font->chars[glyph2].char_code;
pair = PFR_KERN_INDEX( code1, code2 );
/* now search the list of kerning items */
{
PFR_KernItem item = phy_font->kern_items;
FT_Stream stream = pfrface->stream;
for ( ; item; item = item->next )
{
if ( pair >= item->pair1 && pair <= item->pair2 )
goto FoundPair;
}
goto Exit;
FoundPair: /* we found an item, now parse it and find the value if any */
if ( FT_STREAM_SEEK( item->offset ) ||
FT_FRAME_ENTER( item->pair_count * item->pair_size ) )
goto Exit;
{
FT_UInt count = item->pair_count;
FT_UInt size = item->pair_size;
FT_UInt power = 1 << FT_MSB( count );
FT_UInt probe = power * size;
FT_UInt extra = count - power;
FT_Byte* base = stream->cursor;
FT_Bool twobytes = FT_BOOL( item->flags & PFR_KERN_2BYTE_CHAR );
FT_Bool twobyte_adj = FT_BOOL( item->flags & PFR_KERN_2BYTE_ADJ );
FT_Byte* p;
FT_UInt32 cpair;
if ( extra > 0 )
{
p = base + extra * size;
if ( twobytes )
cpair = FT_NEXT_ULONG( p );
else
cpair = PFR_NEXT_KPAIR( p );
if ( cpair == pair )
goto Found;
if ( cpair < pair )
{
if ( twobyte_adj )
p += 2;
else
p++;
base = p;
}
}
while ( probe > size )
{
probe >>= 1;
p = base + probe;
if ( twobytes )
cpair = FT_NEXT_ULONG( p );
else
cpair = PFR_NEXT_KPAIR( p );
if ( cpair == pair )
goto Found;
if ( cpair < pair )
base += probe;
}
p = base;
if ( twobytes )
cpair = FT_NEXT_ULONG( p );
else
cpair = PFR_NEXT_KPAIR( p );
if ( cpair == pair )
{
FT_Int value;
Found:
if ( twobyte_adj )
value = FT_PEEK_SHORT( p );
else
value = p[0];
kerning->x = item->base_adj + value;
}
}
FT_FRAME_EXIT();
}
Exit:
return error;
}
/* END */