ref: 0360168a4d0decdeb2f9dfde9a3be887dcea3892
dir: /src/truetype/ttgload.c/
/***************************************************************************/
/* */
/* ttgload.c */
/* */
/* TrueType Glyph Loader (body). */
/* */
/* Copyright 1996-1999 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 <freetype.h>
#include <ftdebug.h>
#include <ftcalc.h>
#include <ftstream.h>
#include <sfnt.h>
#include <ttgload.h>
#include <tttags.h>
#include <ttinterp.h>
/* required for the tracing mode */
#undef FT_COMPONENT
#define FT_COMPONENT trace_ttgload
/*************************************************************************/
/* */
/* Composite font flags. */
/* */
#define ARGS_ARE_WORDS 0x001
#define ARGS_ARE_XY_VALUES 0x002
#define ROUND_XY_TO_GRID 0x004
#define WE_HAVE_A_SCALE 0x008
/* reserved 0x010 */
#define MORE_COMPONENTS 0x020
#define WE_HAVE_AN_XY_SCALE 0x040
#define WE_HAVE_A_2X2 0x080
#define WE_HAVE_INSTR 0x100
#define USE_MY_METRICS 0x200
#undef SCALE_X
#define SCALE_X( distance ) FT_MulFix( distance, exec->metrics.x_scale )
#undef SCALE_Y
#define SCALE_Y( distance ) FT_MulFix( distance, exec->metrics.y_scale )
/*************************************************************************/
/* */
/* <Function> */
/* TT_Get_Metrics */
/* */
/* <Description> */
/* Returns the horizontal or vertical metrics in font units for a */
/* given glyph. The metrics are the left side bearing (resp. top */
/* side bearing) and advance width (resp. advance height). */
/* */
/* <Input> */
/* header :: A pointer to either the horizontal or vertical metrics */
/* structure. */
/* */
/* index :: The glyph index. */
/* */
/* <Output> */
/* bearing :: The bearing, either left side or top side. */
/* */
/* advance :: The advance width resp. advance height. */
/* */
/* <Note> */
/* This function will much probably move to another component in the */
/* near future, but I haven't decided which yet. */
/* */
LOCAL_FUNC
void TT_Get_Metrics( TT_HoriHeader* header,
TT_UShort index,
TT_Short* bearing,
TT_UShort* advance )
{
TT_LongMetrics* longs_m;
TT_UShort k = header->number_Of_HMetrics;
if ( index < k )
{
longs_m = (TT_LongMetrics*)header->long_metrics + index;
*bearing = longs_m->bearing;
*advance = longs_m->advance;
}
else
{
*bearing = ((TT_ShortMetrics*)header->short_metrics)[index - k];
*advance = ((TT_LongMetrics*)header->long_metrics)[k - 1].advance;
}
}
/*************************************************************************/
/* */
/* <Function> */
/* Get_HMetrics */
/* */
/* <Description> */
/* Returns the horizontal metrics in font units for a given glyph. */
/* If `check' is true, take care of monospaced fonts by returning the */
/* advance width maximum. */
/* */
/* <Input> */
/* face :: A handle to the target source face. */
/* */
/* index :: The glyph index. */
/* */
/* check :: If set, handle monospaced fonts. */
/* */
/* <Output> */
/* lsb :: The left side bearing. */
/* */
/* aw :: The advance width. */
/* */
static
void Get_HMetrics( TT_Face face,
TT_UShort index,
TT_Bool check,
TT_Short* lsb,
TT_UShort* aw )
{
TT_Get_Metrics( &face->horizontal, index, lsb, aw );
if ( check && face->postscript.isFixedPitch )
*aw = face->horizontal.advance_Width_Max;
}
/*************************************************************************/
/* */
/* <Function> */
/* Get_Advance_Widths */
/* */
/* <Description> */
/* Returns the advance width table for a given pixel size if it is */
/* found in the font's `hdmx' table (if any). */
/* */
/* <Input> */
/* face :: A handle to the target source face. */
/* */
/* ppem :: The pixel size. */
/* */
/* <Return> */
/* A pointer to the advance with table. NULL if it doesn't exist. */
/* */
static
TT_Byte* Get_Advance_Widths( TT_Face face,
TT_UShort ppem )
{
TT_UShort n;
for ( n = 0; n < face->hdmx.num_records; n++ )
if ( face->hdmx.records[n].ppem == ppem )
return face->hdmx.records[n].widths;
return NULL;
}
#define cur_to_org( n, zone ) \
MEM_Copy( (zone)->org, (zone)->cur, n * sizeof ( TT_Vector ) )
#define org_to_cur( n, zone ) \
MEM_Copy( (zone)->cur, (zone)->org, n * sizeof ( TT_Vector ) )
/*************************************************************************/
/* */
/* <Function> */
/* translate_array */
/* */
/* <Description> */
/* Translates an array of coordinates. */
/* */
/* <Input> */
/* n :: The number of points to translate. */
/* */
/* delta_x :: The horizontal coordinate of the shift vector. */
/* */
/* delta_y :: The vertical coordinate of the shift vector. */
/* */
/* <InOut> */
/* coords :: The vector array to translate. */
/* */
static
void translate_array( TT_UShort n,
TT_Vector* coords,
TT_Pos delta_x,
TT_Pos delta_y )
{
TT_UShort k;
if ( delta_x )
for ( k = 0; k < n; k++ )
coords[k].x += delta_x;
if ( delta_y )
for ( k = 0; k < n; k++ )
coords[k].y += delta_y;
}
/*************************************************************************/
/* */
/* <Function> */
/* mount_zone */
/* */
/* <Description> */
/* Mounts one glyph zone on top of another. This is needed to */
/* assemble composite glyphs. */
/* */
/* <Input> */
/* source :: The source glyph zone. */
/* */
/* <Output> */
/* target :: The target glyph zone. */
/* */
static
void mount_zone( TT_GlyphZone* source,
TT_GlyphZone* target )
{
TT_UShort np;
TT_Short nc;
np = source->n_points;
nc = source->n_contours;
target->org = source->org + np;
target->cur = source->cur + np;
target->touch = source->touch + np;
target->contours = source->contours + nc;
target->n_points = 0;
target->n_contours = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* Load_Simple_Glyph */
/* */
/* <Description> */
/* Loads a simple (i.e, non-composite) glyph. This function is used */
/* for the `Load_Simple' state of TT_Load_Glyph(). All composite */
/* glyphs elements will be loaded with routine. */
/* */
static
TT_Error Load_Simple_Glyph( TT_ExecContext exec,
FT_Stream stream,
TT_ULong byte_count,
TT_Short n_contours,
TT_Short left_contours,
TT_UShort left_points,
TT_UInt load_flags,
TT_SubGlyphRec* subg,
TT_Bool debug )
{
TT_Error error;
TT_GlyphZone* pts;
TT_Short k;
TT_UShort j;
TT_UShort n_points, n_ins;
TT_Face face;
TT_Byte* flag;
TT_Vector* vec;
TT_F26Dot6 x, y;
TT_Vector *pp1, *pp2;
face = exec->face;
/*********************************************************************/
/* simple check */
if ( n_contours > left_contours )
{
FT_TRACE0(( "ERROR: Glyph index %ld has %d contours > left %d\n",
subg->index,
n_contours,
left_contours ));
return TT_Err_Too_Many_Contours;
}
/* preparing the execution context */
mount_zone( &subg->zone, &exec->pts );
/*********************************************************************/
/* reading the contours endpoints */
if ( ACCESS_Frame( byte_count ) )
return error;
for ( k = 0; k < n_contours; k++ )
exec->pts.contours[k] = GET_UShort();
n_points = 0;
if ( n_contours > 0 )
n_points = exec->pts.contours[n_contours - 1] + 1;
/*********************************************************************/
/* reading the bytecode instructions */
n_ins = GET_UShort();
if ( n_points > left_points )
{
FT_TRACE0(( "ERROR: Too many points in glyph %ld\n", subg->index ));
error = TT_Err_Too_Many_Points;
goto Fail;
}
FT_TRACE4(( "Instructions size : %d\n", n_ins ));
if ( n_ins > face->max_profile.maxSizeOfInstructions )
{
FT_TRACE0(( "ERROR: Too many instructions!\n" ));
error = TT_Err_Too_Many_Ins;
goto Fail;
}
if (stream->cursor + n_ins > stream->limit)
{
FT_TRACE0(( "ERROR: Instruction count mismatch!\n" ));
error = TT_Err_Too_Many_Ins;
goto Fail;
}
MEM_Copy( exec->glyphIns, stream->cursor, n_ins );
stream->cursor += n_ins;
error = TT_Set_CodeRange( exec, tt_coderange_glyph,
exec->glyphIns, n_ins );
if (error) goto Fail;
/*********************************************************************/
/* reading the point flags */
j = 0;
flag = exec->pts.touch;
while ( j < n_points )
{
TT_Byte c, cnt;
flag[j] = c = GET_Byte();
j++;
if ( c & 8 )
{
cnt = GET_Byte();
while( cnt > 0 )
{
flag[j++] = c;
cnt--;
}
}
}
/*********************************************************************/
/* reading the X coordinates */
x = 0;
vec = exec->pts.org;
for ( j = 0; j < n_points; j++ )
{
if ( flag[j] & 2 )
{
if ( flag[j] & 16 )
x += GET_Byte();
else
x -= GET_Byte();
}
else
{
if ( (flag[j] & 16) == 0 )
x += GET_Short();
}
vec[j].x = x;
}
/*********************************************************************/
/* reading the YX coordinates */
y = 0;
for ( j = 0; j < n_points; j++ )
{
if ( flag[j] & 4 )
{
if ( flag[j] & 32 )
y += GET_Byte();
else
y -= GET_Byte();
}
else
{
if ( (flag[j] & 32) == 0 )
y += GET_Short();
}
vec[j].y = y;
}
FORGET_Frame();
/*********************************************************************/
/* Add shadow points */
/* Now add the two shadow points at n and n + 1. */
/* We need the left side bearing and advance width. */
/* pp1 = xMin - lsb */
pp1 = vec + n_points;
pp1->x = subg->bbox.xMin - subg->left_bearing;
pp1->y = 0;
/* pp2 = pp1 + aw */
pp2 = pp1 + 1;
pp2->x = pp1->x + subg->advance;
pp2->y = 0;
/* clear the touch flags */
for ( j = 0; j < n_points; j++ )
exec->pts.touch[j] &= FT_Curve_Tag_On;
exec->pts.touch[n_points ] = 0;
exec->pts.touch[n_points + 1] = 0;
/* Note that we return two more points that are not */
/* part of the glyph outline. */
n_points += 2;
/* now eventually scale and hint the glyph */
pts = &exec->pts;
pts->n_points = n_points;
pts->n_contours = n_contours;
if (load_flags & FT_LOAD_NO_SCALE)
{
/* no scaling, just copy the orig arrays into the cur ones */
org_to_cur( n_points, pts );
}
else
{
/* first scale the glyph points */
for ( j = 0; j < n_points; j++ )
{
pts->org[j].x = SCALE_X( pts->org[j].x );
pts->org[j].y = SCALE_Y( pts->org[j].y );
}
/* if hinting, round pp1, and shift the glyph accordingly */
if ( subg->is_hinted )
{
x = pts->org[n_points - 2].x;
x = ((x + 32) & -64) - x;
translate_array( n_points, pts->org, x, 0 );
org_to_cur( n_points, pts );
pts->cur[n_points - 1].x = (pts->cur[n_points - 1].x + 32) & -64;
/* now consider hinting */
if ( n_ins > 0 )
{
exec->is_composite = FALSE;
exec->pedantic_hinting = load_flags & FT_LOAD_PEDANTIC;
error = TT_Run_Context( exec, debug );
if ( error && exec->pedantic_hinting )
return error;
}
}
else
org_to_cur( n_points, pts );
}
/* save glyph phantom points */
if ( !subg->preserve_pps )
{
subg->pp1 = pts->cur[n_points - 2];
subg->pp2 = pts->cur[n_points - 1];
}
return TT_Err_Ok;
Fail:
FORGET_Frame();
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* Load_Composite_End */
/* */
/* <Description> */
/* Finalizes the loading process of a composite glyph element. This */
/* function is used for the `Load_End' state of TT_Load_Glyph(). */
/* */
static
TT_Error Load_Composite_End( TT_UShort n_points,
TT_Short n_contours,
TT_ExecContext exec,
TT_SubGlyphRec* subg,
FT_Stream stream,
TT_UInt load_flags,
TT_Bool debug )
{
TT_Error error;
TT_UShort k, n_ins;
TT_GlyphZone* pts;
if ( subg->is_hinted &&
subg->element_flag & WE_HAVE_INSTR )
{
if ( READ_UShort( n_ins ) ) /* read size of instructions */
return error;
FT_TRACE4(( "Instructions size = %d\n", n_ins ));
if ( n_ins > exec->face->max_profile.maxSizeOfInstructions )
{
FT_TRACE0(( "Too many instructions in composite glyph %ld\n",
subg->index ));
return TT_Err_Too_Many_Ins;
}
if ( FILE_Read( exec->glyphIns, n_ins ) )
return error;
error = TT_Set_CodeRange( exec,
tt_coderange_glyph,
exec->glyphIns,
n_ins );
if ( error )
return error;
}
else
n_ins = 0;
/* prepare the execution context */
n_points += 2;
exec->pts = subg->zone;
pts = &exec->pts;
pts->n_points = n_points;
pts->n_contours = n_contours;
/* add phantom points */
pts->cur[n_points - 2] = subg->pp1;
pts->cur[n_points - 1] = subg->pp2;
pts->touch[n_points - 1] = 0;
pts->touch[n_points - 2] = 0;
/* if hinting, round the phantom points */
if ( subg->is_hinted )
{
pts->cur[n_points - 2].x = ((subg->pp1.x + 32) & -64);
pts->cur[n_points - 1].x = ((subg->pp2.x + 32) & -64);
}
for ( k = 0; k < n_points; k++ )
pts->touch[k] &= FT_Curve_Tag_On;
cur_to_org( n_points, pts );
/* now consider hinting */
if ( subg->is_hinted && n_ins > 0 )
{
exec->is_composite = TRUE;
exec->pedantic_hinting = load_flags & FT_LOAD_PEDANTIC;
error = TT_Run_Context( exec, debug );
if ( error && exec->pedantic_hinting )
return error;
}
/* save glyph origin and advance points */
subg->pp1 = pts->cur[n_points - 2];
subg->pp2 = pts->cur[n_points - 1];
return TT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* Init_Glyph_Component */
/* */
/* <Description> */
/* Initializes a glyph component for further processing. */
/* */
static
void Init_Glyph_Component( TT_SubGlyphRec* element,
TT_SubGlyphRec* original,
TT_ExecContext exec )
{
element->index = -1;
element->is_scaled = FALSE;
element->is_hinted = FALSE;
if ( original )
mount_zone( &original->zone, &element->zone );
else
element->zone = exec->pts;
element->zone.n_contours = 0;
element->zone.n_points = 0;
element->arg1 = 0;
element->arg2 = 0;
element->element_flag = 0;
element->preserve_pps = FALSE;
element->transform.xx = 0x10000;
element->transform.xy = 0;
element->transform.yx = 0;
element->transform.yy = 0x10000;
element->transform.ox = 0;
element->transform.oy = 0;
element->left_bearing = 0;
element->advance = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_Glyph */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size. */
/* */
/* <Input> */
/* glyph :: A handle to a target slot object where the glyph */
/* will be loaded. */
/* */
/* size :: A handle to the source face size at which the glyph */
/* must be scaled/loaded. */
/* */
/* glyph_index :: The index of the glyph in the font file. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* <Output> */
/* result :: A set of bit flags indicating the type of data that */
/* was loaded in the glyph slot (outline or bitmap, */
/* etc). */
/* */
/* You can set this field to 0 if you don't want this */
/* information. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Glyph( TT_Size size,
TT_GlyphSlot glyph,
TT_UShort glyph_index,
TT_UInt load_flags )
{
typedef enum TPhases_
{
Load_Exit,
Load_Glyph,
Load_Header,
Load_Simple,
Load_Composite,
Load_End
} TPhases;
TT_Error error = 0;
FT_Stream stream;
TT_Face face;
TT_UShort num_points;
TT_Short num_contours;
TT_UShort left_points;
TT_Short left_contours;
TT_ULong load_top;
TT_Long k, l;
TT_Int new_flags;
TT_UShort index;
TT_UShort u;
TT_Long count;
TT_Long glyph_offset, offset;
TT_F26Dot6 x, y, nx, ny;
TT_Fixed xx, xy, yx, yy;
TT_BBox bbox;
TT_ExecContext exec;
TT_SubGlyphRec *subglyph, *subglyph2;
TT_GlyphZone base_pts;
TPhases phase;
TT_Byte* widths;
TT_Int num_elem_points;
SFNT_Interface* sfnt;
/* first of all, check arguments */
if ( !glyph )
return TT_Err_Invalid_Glyph_Handle;
face = (TT_Face)glyph->face;
if ( !face )
return TT_Err_Invalid_Glyph_Handle;
sfnt = (SFNT_Interface*)face->sfnt;
stream = face->root.stream;
count = 0;
if ( glyph_index >= face->root.num_glyphs )
return TT_Err_Invalid_Glyph_Index;
if ( !size || (load_flags & FT_LOAD_NO_SCALE) )
{
size = NULL;
load_flags |= FT_LOAD_NO_SCALE |
FT_LOAD_NO_HINTING |
FT_LOAD_NO_BITMAP;
}
/* Try to load embedded bitmap if any */
if ( size && (load_flags & FT_LOAD_NO_BITMAP) == 0 && sfnt->load_sbits )
{
TT_SBit_Metrics metrics;
error = sfnt->load_sbit_image( face,
size->root.metrics.x_ppem,
size->root.metrics.y_ppem,
glyph_index,
stream,
&glyph->bitmap,
&metrics );
if ( !error )
{
glyph->outline.n_points = 0;
glyph->outline.n_contours = 0;
glyph->metrics.width = (TT_Pos)metrics.width << 6;
glyph->metrics.height = (TT_Pos)metrics.height << 6;
glyph->metrics.horiBearingX = (TT_Pos)metrics.horiBearingX << 6;
glyph->metrics.horiBearingY = (TT_Pos)metrics.horiBearingY << 6;
glyph->metrics.horiAdvance = (TT_Pos)metrics.horiAdvance << 6;
glyph->metrics.vertBearingX = (TT_Pos)metrics.vertBearingX << 6;
glyph->metrics.vertBearingY = (TT_Pos)metrics.vertBearingY << 6;
glyph->metrics.vertAdvance = (TT_Pos)metrics.vertAdvance << 6;
glyph->format = ft_glyph_format_bitmap;
return error;
}
}
if ( load_flags & FT_LOAD_NO_OUTLINE )
return ( error ? error : TT_Err_Unavailable_Bitmap );
error = face->goto_table( face, TTAG_glyf, stream, 0 );
if (error)
{
FT_ERROR(( "TT.GLoad: could not access glyph table\n" ));
return error;
}
glyph_offset = FILE_Pos();
/* query new execution context */
if ( size && size->debug )
exec = size->context;
else
exec = TT_New_Context( face );
if ( !exec )
return TT_Err_Could_Not_Find_Context;
TT_Load_Context( exec, face, size );
if ( size )
{
/* load default graphics state - if needed */
if ( size->GS.instruct_control & 2 )
exec->GS = tt_default_graphics_state;
glyph->outline.high_precision = ( size->root.metrics.y_ppem < 24 );
}
/* save its critical pointers, as they'll be modified during load */
base_pts = exec->pts;
/* init variables */
left_points = face->root.max_points; /* remove phantom points */
left_contours = face->root.max_contours;
num_points = 0;
num_contours = 0;
load_top = 0;
subglyph = exec->loadStack;
Init_Glyph_Component( subglyph, NULL, exec );
subglyph->index = glyph_index;
subglyph->is_hinted = !(load_flags & FT_LOAD_NO_HINTING);
/* when the cvt program has disabled hinting, the argument */
/* is ignored. */
if ( size && (size->GS.instruct_control & 1) )
subglyph->is_hinted = FALSE;
/* Main loading loop */
phase = Load_Glyph;
index = 0;
while ( phase != Load_Exit )
{
subglyph = exec->loadStack + load_top;
switch ( phase )
{
/************************************************************/
/* */
/* Load_Glyph state */
/* */
/* reading a glyph's generic data, checking whether the */
/* glyph is cached already (not implemented yet) */
/* */
/* exit states: Load_Header and Load_End */
/* */
case Load_Glyph:
/* check glyph index and table */
index = (TT_UInt)subglyph->index;
if ( index >= face->root.num_glyphs )
{
error = TT_Err_Invalid_Glyph_Index;
goto Fail;
}
/* get horizontal metrics */
{
TT_Short left_bearing;
TT_UShort advance_width;
Get_HMetrics( face, index, TRUE,
&left_bearing,
&advance_width );
subglyph->left_bearing = left_bearing;
subglyph->advance = advance_width;
}
phase = Load_Header;
/************************************************************/
/* */
/* Load_Header state */
/* */
/* reading a glyph's generic header to determine whether */
/* it is a simple or composite glyph */
/* */
/* exit states: Load_Simple and Load_Composite */
/* */
case Load_Header:
/* load glyph */
offset = face->glyph_locations[index];
count = 0;
if (index < face->num_locations-1)
count = face->glyph_locations[index+1] - offset;
if (count == 0)
{
/* as described by Frederic Loyer, these are spaces, and */
/* not the unknown glyph. */
num_contours = 0;
num_points = 0;
subglyph->bbox.xMin = 0;
subglyph->bbox.xMax = 0;
subglyph->bbox.yMin = 0;
subglyph->bbox.yMax = 0;
subglyph->pp1.x = 0;
subglyph->pp2.x = subglyph->advance;
if ( !(load_flags & FT_LOAD_NO_SCALE) )
subglyph->pp2.x = SCALE_X( subglyph->pp2.x );
exec->glyphSize = 0;
phase = Load_End;
break;
}
offset = glyph_offset + offset;
/* read first glyph header */
if ( FILE_Seek( offset ) ||
ACCESS_Frame( 10L ) )
goto Fail_File;
num_contours = GET_Short();
subglyph->bbox.xMin = GET_Short();
subglyph->bbox.yMin = GET_Short();
subglyph->bbox.xMax = GET_Short();
subglyph->bbox.yMax = GET_Short();
FORGET_Frame();
FT_TRACE6(( "Glyph %ld\n", index ));
FT_TRACE6(( " # of contours : %d\n", num_contours ));
FT_TRACE6(( " xMin: %4d xMax: %4d\n",
subglyph->bbox.xMin,
subglyph->bbox.xMax ));
FT_TRACE6(( " yMin: %4d yMax: %4d\n",
subglyph->bbox.yMin,
subglyph->bbox.yMax ));
FT_TRACE6(( "-" ));
count -= 10;
if ( num_contours > left_contours )
{
FT_TRACE0(( "ERROR: Too many contours for glyph %ld\n", index ));
error = TT_Err_Too_Many_Contours;
goto Fail;
}
subglyph->pp1.x = subglyph->bbox.xMin - subglyph->left_bearing;
subglyph->pp1.y = 0;
subglyph->pp2.x = subglyph->pp1.x + subglyph->advance;
if (!(load_flags & FT_LOAD_NO_SCALE))
{
subglyph->pp1.x = SCALE_X( subglyph->pp1.x );
subglyph->pp2.x = SCALE_X( subglyph->pp2.x );
}
/* is it a simple glyph ? */
if ( num_contours < 0 )
{
phase = Load_Composite;
break;
}
phase = Load_Simple;
/************************************************************/
/* */
/* Load_Simple state */
/* */
/* reading a simple glyph (num_contours must be set to */
/* the glyph's number of contours.) */
/* */
/* exit state: Load_End */
/* */
case Load_Simple:
new_flags = load_flags;
/* disable hinting when scaling */
if ( !subglyph->is_hinted )
new_flags |= FT_LOAD_NO_HINTING;
error = Load_Simple_Glyph( exec,
stream,
count,
num_contours,
left_contours,
left_points,
new_flags,
subglyph,
(TT_Bool)(size && size->debug &&
load_top == 0) );
if ( error )
goto Fail;
/* Note: We could have put the simple loader source there */
/* but the code is fat enough already :-) */
num_points = exec->pts.n_points - 2;
phase = Load_End;
break;
/************************************************************/
/* */
/* Load_Composite state */
/* */
/* reading a composite glyph header and pushing a new */
/* load element on the stack. */
/* */
/* exit state: Load_Glyph */
/* */
case Load_Composite:
/* create a new element on the stack */
load_top++;
if ( load_top > face->max_components )
{
error = TT_Err_Invalid_Composite;
goto Fail;
}
subglyph2 = exec->loadStack + load_top;
Init_Glyph_Component( subglyph2, subglyph, NULL );
subglyph2->is_hinted = subglyph->is_hinted;
/* now read composite header */
if ( ACCESS_Frame( 4L ) )
goto Fail_File;
subglyph->element_flag = new_flags = GET_UShort();
subglyph2->index = GET_UShort();
FORGET_Frame();
k = 1+1;
if ( new_flags & ARGS_ARE_WORDS )
k *= 2;
if ( new_flags & WE_HAVE_A_SCALE )
k += 2;
else if ( new_flags & WE_HAVE_AN_XY_SCALE )
k += 4;
else if ( new_flags & WE_HAVE_A_2X2 )
k += 8;
if ( ACCESS_Frame( k ) )
goto Fail_File;
if ( new_flags & ARGS_ARE_WORDS )
{
k = GET_Short();
l = GET_Short();
}
else
{
k = GET_Char();
l = GET_Char();
}
subglyph->arg1 = k;
subglyph->arg2 = l;
if ( new_flags & ARGS_ARE_XY_VALUES )
{
subglyph->transform.ox = k;
subglyph->transform.oy = l;
}
xx = 0x10000;
xy = 0;
yx = 0;
yy = 0x10000;
if ( new_flags & WE_HAVE_A_SCALE )
{
xx = (TT_Fixed)GET_Short() << 2;
yy = xx;
subglyph2->is_scaled = TRUE;
}
else if ( new_flags & WE_HAVE_AN_XY_SCALE )
{
xx = (TT_Fixed)GET_Short() << 2;
yy = (TT_Fixed)GET_Short() << 2;
subglyph2->is_scaled = TRUE;
}
else if ( new_flags & WE_HAVE_A_2X2 )
{
xx = (TT_Fixed)GET_Short() << 2;
xy = (TT_Fixed)GET_Short() << 2;
yx = (TT_Fixed)GET_Short() << 2;
yy = (TT_Fixed)GET_Short() << 2;
subglyph2->is_scaled = TRUE;
}
FORGET_Frame();
subglyph->transform.xx = xx;
subglyph->transform.xy = xy;
subglyph->transform.yx = yx;
subglyph->transform.yy = yy;
k = FT_MulFix( xx, yy ) - FT_MulFix( xy, yx );
/* disable hinting in case of scaling/slanting */
if ( ABS( k ) != 0x10000 )
subglyph2->is_hinted = FALSE;
subglyph->file_offset = FILE_Pos();
phase = Load_Glyph;
break;
/************************************************************/
/* */
/* Load_End state */
/* */
/* after loading a glyph, apply transformation and offset */
/* where necessary, pop element and continue or stop */
/* process. */
/* */
/* exit states: Load_Composite and Load_Exit */
/* */
case Load_End:
if ( load_top > 0 )
{
subglyph2 = subglyph;
load_top--;
subglyph = exec->loadStack + load_top;
/* check advance width and left side bearing */
if ( !subglyph->preserve_pps &&
subglyph->element_flag & USE_MY_METRICS )
{
subglyph->left_bearing = subglyph2->left_bearing;
subglyph->advance = subglyph2->advance;
subglyph->pp1 = subglyph2->pp1;
subglyph->pp2 = subglyph2->pp2;
subglyph->preserve_pps = TRUE;
}
/* apply scale */
if ( subglyph2->is_scaled )
{
TT_Vector* cur = subglyph2->zone.cur;
TT_Vector* org = subglyph2->zone.org;
for ( u = 0; u < num_points; u++ )
{
nx = FT_MulFix( cur->x, subglyph->transform.xx ) +
FT_MulFix( cur->y, subglyph->transform.yx );
ny = FT_MulFix( cur->x, subglyph->transform.xy ) +
FT_MulFix( cur->y, subglyph->transform.yy );
cur->x = nx;
cur->y = ny;
nx = FT_MulFix( org->x, subglyph->transform.xx ) +
FT_MulFix( org->y, subglyph->transform.yx );
ny = FT_MulFix( org->x, subglyph->transform.xy ) +
FT_MulFix( org->y, subglyph->transform.yy );
org->x = nx;
org->y = ny;
cur++;
org++;
}
}
/* adjust counts */
num_elem_points = subglyph->zone.n_points;
for ( k = 0; k < num_contours; k++ )
subglyph2->zone.contours[k] += num_elem_points;
subglyph->zone.n_points += num_points;
subglyph->zone.n_contours += num_contours;
left_points -= num_points;
left_contours -= num_contours;
/* apply offset */
if ( !(subglyph->element_flag & ARGS_ARE_XY_VALUES) )
{
k = subglyph->arg1;
l = subglyph->arg2;
if ( k >= num_elem_points ||
l >= num_points )
{
error = TT_Err_Invalid_Composite;
goto Fail;
}
l += num_elem_points;
x = subglyph->zone.cur[k].x - subglyph->zone.cur[l].x;
y = subglyph->zone.cur[k].y - subglyph->zone.cur[l].y;
}
else
{
x = subglyph->transform.ox;
y = subglyph->transform.oy;
if (!(load_flags & FT_LOAD_NO_SCALE))
{
x = SCALE_X( x );
y = SCALE_Y( y );
if ( subglyph->element_flag & ROUND_XY_TO_GRID )
{
x = (x + 32) & -64;
y = (y + 32) & -64;
}
}
}
translate_array( num_points, subglyph2->zone.cur, x, y );
cur_to_org( num_points, &subglyph2->zone );
num_points = subglyph->zone.n_points;
num_contours = subglyph->zone.n_contours;
/* check for last component */
if ( FILE_Seek( subglyph->file_offset ) )
goto Fail_File;
if ( subglyph->element_flag & MORE_COMPONENTS )
phase = Load_Composite;
else
{
error = Load_Composite_End( num_points,
num_contours,
exec,
subglyph,
stream,
load_flags,
(TT_Bool)(size && size->debug &&
load_top == 0) );
if ( error )
goto Fail;
phase = Load_End;
}
}
else
phase = Load_Exit;
break;
case Load_Exit:
break;
}
}
/* finally, copy the points arrays to the glyph object */
exec->pts = base_pts;
for ( u = 0; u < num_points + 2; u++ )
{
glyph->outline.points[u] = exec->pts.cur[u];
glyph->outline.flags [u] = exec->pts.touch[u];
}
for ( k = 0; k < num_contours; k++ )
glyph->outline.contours[k] = exec->pts.contours[k];
glyph->outline.n_points = num_points;
glyph->outline.n_contours = num_contours;
glyph->outline.second_pass = TRUE;
/* translate array so that (0,0) is the glyph's origin */
translate_array( (TT_UShort)(num_points + 2),
glyph->outline.points,
-subglyph->pp1.x,
0 );
FT_Get_Outline_CBox( &glyph->outline, &bbox );
if ( subglyph->is_hinted )
{
/* grid-fit the bounding box */
bbox.xMin &= -64;
bbox.yMin &= -64;
bbox.xMax = (bbox.xMax + 63) & -64;
bbox.yMax = (bbox.yMax + 63) & -64;
}
/* get the device-independent scaled horizontal metrics */
/* take care of fixed-pitch fonts... */
{
TT_Pos left_bearing;
TT_Pos advance;
left_bearing = subglyph->left_bearing;
advance = subglyph->advance;
if ( face->postscript.isFixedPitch )
advance = face->horizontal.advance_Width_Max;
if ( !(load_flags & FT_LOAD_NO_SCALE) )
{
left_bearing = SCALE_X( left_bearing );
advance = SCALE_X( advance );
}
glyph->metrics2.horiBearingX = left_bearing;
glyph->metrics2.horiAdvance = advance;
}
glyph->metrics.horiBearingX = bbox.xMin;
glyph->metrics.horiBearingY = bbox.yMax;
glyph->metrics.horiAdvance = subglyph->pp2.x - subglyph->pp1.x;
/* Now take care of vertical metrics. In the case where there is */
/* no vertical information within the font (relatively common), make */
/* up some metrics by `hand'... */
{
TT_Short top_bearing; /* vertical top side bearing (EM units) */
TT_UShort advance_height; /* vertical advance height (EM units) */
TT_Pos left; /* scaled vertical left side bearing */
TT_Pos Top; /* scaled original vertical top side bearing */
TT_Pos top; /* scaled vertical top side bearing */
TT_Pos advance; /* scaled vertical advance height */
/* Get the unscaled `tsb' and `ah' */
if ( face->vertical_info &&
face->vertical.number_Of_VMetrics > 0 )
{
/* Don't assume that both the vertical header and vertical */
/* metrics are present in the same font :-) */
TT_Get_Metrics( (TT_HoriHeader*)&face->vertical,
glyph_index,
&top_bearing,
&advance_height );
}
else
{
/* Make up the distances from the horizontal header.. */
/* NOTE: The OS/2 values are the only `portable' ones, */
/* which is why we use them, when there is an */
/* OS/2 table in the font. Otherwise, we use the */
/* values defined in the horizontal header.. */
/* */
/* NOTE2: The sTypoDescender is negative, which is why */
/* we compute the baseline-to-baseline distance */
/* here with: */
/* ascender - descender + linegap */
/* */
if ( face->os2.version != 0xFFFF )
{
top_bearing = face->os2.sTypoLineGap / 2;
advance_height = (TT_UShort)(face->os2.sTypoAscender -
face->os2.sTypoDescender +
face->os2.sTypoLineGap);
}
else
{
top_bearing = face->horizontal.Line_Gap / 2;
advance_height = (TT_UShort)(face->horizontal.Ascender +
face->horizontal.Descender +
face->horizontal.Line_Gap);
}
}
/* We must adjust the top_bearing value from the bounding box given
in the glyph header to te bounding box calculated with
TT_Get_Outline_BBox() */
/* scale the metrics */
if ( !(load_flags & FT_LOAD_NO_SCALE) )
{
Top = SCALE_Y( top_bearing );
top = SCALE_Y( top_bearing + subglyph->bbox.yMax ) - bbox.yMax;
advance = SCALE_Y( advance_height );
}
else
{
Top = top_bearing;
top = top_bearing + subglyph->bbox.yMax - bbox.yMax;
advance = advance_height;
}
glyph->metrics2.vertBearingY = Top;
glyph->metrics2.vertAdvance = advance;
/* XXX: for now, we have no better algorithm for the lsb, but it */
/* should work fine. */
/* */
left = ( bbox.xMin - bbox.xMax ) / 2;
/* grid-fit them if necessary */
if ( subglyph->is_hinted )
{
left &= -64;
top = (top + 63) & -64;
advance = (advance + 32) & -64;
}
glyph->metrics.vertBearingX = left;
glyph->metrics.vertBearingY = top;
glyph->metrics.vertAdvance = advance;
}
/* Adjust advance width to the value contained in the hdmx table. */
if ( !exec->face->postscript.isFixedPitch && size &&
subglyph->is_hinted )
{
widths = Get_Advance_Widths( exec->face,
exec->size->root.metrics.x_ppem );
if ( widths )
glyph->metrics.horiAdvance = widths[glyph_index] << 6;
}
glyph->outline.dropout_mode = (TT_Char)exec->GS.scan_type;
/* set glyph dimensions */
glyph->metrics.width = bbox.xMax - bbox.xMin;
glyph->metrics.height = bbox.yMax - bbox.yMin;
glyph->format = ft_glyph_format_outline;
error = TT_Err_Ok;
Fail_File:
Fail:
/* reset the execution context */
exec->pts = base_pts;
if ( !size || !size->debug )
TT_Done_Context( exec );
return error;
}
/* END */