ref: 435046b54b46969d37a4fd0fb01a106892212b7b
dir: /src/autofit/afloader.c/
/***************************************************************************/
/* */
/* afloader.c */
/* */
/* Auto-fitter glyph loading routines (body). */
/* */
/* Copyright 2003, 2004, 2005 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 "afloader.h"
#include "afhints.h"
#include "afglobal.h"
#include "aflatin.h"
#include "aferrors.h"
FT_LOCAL_DEF( FT_Error )
af_loader_init( AF_Loader loader,
FT_Memory memory )
{
FT_Error error;
FT_ZERO( loader );
af_glyph_hints_init( &loader->hints, memory );
error = FT_GlyphLoader_New( memory, &loader->gloader );
if ( !error )
{
error = FT_GlyphLoader_CreateExtra( loader->gloader );
if ( error )
{
FT_GlyphLoader_Done( loader->gloader );
loader->gloader = NULL;
}
}
return error;
}
FT_LOCAL_DEF( FT_Error )
af_loader_reset( AF_Loader loader,
FT_Face face )
{
FT_Error error = AF_Err_Ok;
loader->face = face;
loader->globals = (AF_FaceGlobals)face->autohint.data;
FT_GlyphLoader_Rewind( loader->gloader );
if ( loader->globals == NULL )
{
error = af_face_globals_new( face, &loader->globals );
if ( !error )
{
face->autohint.data =
(FT_Pointer)loader->globals;
face->autohint.finalizer =
(FT_Generic_Finalizer)af_face_globals_free;
}
}
return error;
}
FT_LOCAL_DEF( void )
af_loader_done( AF_Loader loader )
{
af_glyph_hints_done( &loader->hints );
loader->face = NULL;
loader->globals = NULL;
FT_GlyphLoader_Done( loader->gloader );
loader->gloader = NULL;
}
static FT_Error
af_loader_load_g( AF_Loader loader,
AF_Scaler scaler,
FT_UInt glyph_index,
FT_Int32 load_flags,
FT_UInt depth )
{
FT_Error error;
FT_Face face = loader->face;
FT_GlyphLoader gloader = loader->gloader;
AF_ScriptMetrics metrics = loader->metrics;
AF_GlyphHints hints = &loader->hints;
FT_GlyphSlot slot = face->glyph;
FT_Slot_Internal internal = slot->internal;
error = FT_Load_Glyph( face, glyph_index, load_flags );
if ( error )
goto Exit;
loader->transformed = internal->glyph_transformed;
if ( loader->transformed )
{
FT_Matrix inverse;
loader->trans_matrix = internal->glyph_matrix;
loader->trans_delta = internal->glyph_delta;
inverse = loader->trans_matrix;
FT_Matrix_Invert( &inverse );
FT_Vector_Transform( &loader->trans_delta, &inverse );
}
/* set linear metrics */
slot->linearHoriAdvance = slot->metrics.horiAdvance;
slot->linearVertAdvance = slot->metrics.vertAdvance;
switch ( slot->format )
{
case FT_GLYPH_FORMAT_OUTLINE:
/* translate the loaded glyph when an internal transform is needed */
if ( loader->transformed )
FT_Outline_Translate( &slot->outline,
loader->trans_delta.x,
loader->trans_delta.y );
/* copy the outline points in the loader's current */
/* extra points which is used to keep original glyph coordinates */
error = FT_GLYPHLOADER_CHECK_POINTS( gloader,
slot->outline.n_points + 4,
slot->outline.n_contours );
if ( error )
goto Exit;
FT_ARRAY_COPY( gloader->current.outline.points,
slot->outline.points,
slot->outline.n_points );
FT_ARRAY_COPY( gloader->current.extra_points,
slot->outline.points,
slot->outline.n_points );
FT_ARRAY_COPY( gloader->current.outline.contours,
slot->outline.contours,
slot->outline.n_contours );
FT_ARRAY_COPY( gloader->current.outline.tags,
slot->outline.tags,
slot->outline.n_points );
gloader->current.outline.n_points = slot->outline.n_points;
gloader->current.outline.n_contours = slot->outline.n_contours;
/* compute original horizontal phantom points (and ignore */
/* vertical ones) */
loader->pp1.x = hints->x_delta;
loader->pp1.y = hints->y_delta;
loader->pp2.x = FT_MulFix( slot->metrics.horiAdvance,
hints->x_scale ) + hints->x_delta;
loader->pp2.y = hints->y_delta;
/* be sure to check for spacing glyphs */
if ( slot->outline.n_points == 0 )
goto Hint_Metrics;
/* now load the slot image into the auto-outline and run the */
/* automatic hinting process */
metrics->clazz->script_hints_apply( hints,
&gloader->current.outline,
metrics );
/* we now need to hint the metrics according to the change in */
/* width/positioning that occured during the hinting process */
{
FT_Pos old_advance, old_rsb, old_lsb, new_lsb;
FT_Pos pp1x_uh, pp2x_uh;
AF_AxisHints axis = &hints->axis[AF_DIMENSION_HORZ];
AF_Edge edge1 = axis->edges; /* leftmost edge */
AF_Edge edge2 = edge1 +
axis->num_edges - 1; /* rightmost edge */
if ( axis->num_edges > 1 )
{
old_advance = loader->pp2.x;
old_rsb = old_advance - edge2->opos;
old_lsb = edge1->opos;
new_lsb = edge1->pos;
/* remember unhinted values to later account */
/* for rounding errors */
pp1x_uh = new_lsb - old_lsb;
pp2x_uh = edge2->pos + old_rsb;
/* prefer too much space over too little space */
/* for very small sizes */
if ( old_lsb < 24 )
pp1x_uh -= 5;
if ( old_rsb < 24 )
pp2x_uh += 5;
loader->pp1.x = FT_PIX_ROUND( pp1x_uh );
loader->pp2.x = FT_PIX_ROUND( pp2x_uh );
slot->lsb_delta = loader->pp1.x - pp1x_uh;
slot->rsb_delta = loader->pp2.x - pp2x_uh;
#if 0
/* try to fix certain bad advance computations */
if ( loader->pp2.x + loader->pp1.x == edge2->pos && old_rsb > 4 )
loader->pp2.x += 64;
#endif
}
else
{
loader->pp1.x = FT_PIX_ROUND( loader->pp1.x );
loader->pp2.x = FT_PIX_ROUND( loader->pp2.x );
}
}
/* good, we simply add the glyph to our loader's base */
FT_GlyphLoader_Add( gloader );
break;
case FT_GLYPH_FORMAT_COMPOSITE:
{
FT_UInt nn, num_subglyphs = slot->num_subglyphs;
FT_UInt num_base_subgs, start_point;
FT_SubGlyph subglyph;
start_point = gloader->base.outline.n_points;
/* first of all, copy the subglyph descriptors in the glyph loader */
error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs );
if ( error )
goto Exit;
FT_ARRAY_COPY( gloader->current.subglyphs,
slot->subglyphs,
num_subglyphs );
gloader->current.num_subglyphs = num_subglyphs;
num_base_subgs = gloader->base.num_subglyphs;
/* now, read each subglyph independently */
for ( nn = 0; nn < num_subglyphs; nn++ )
{
FT_Vector pp1, pp2;
FT_Pos x, y;
FT_UInt num_points, num_new_points, num_base_points;
/* gloader.current.subglyphs can change during glyph loading due */
/* to re-allocation -- we must recompute the current subglyph on */
/* each iteration */
subglyph = gloader->base.subglyphs + num_base_subgs + nn;
pp1 = loader->pp1;
pp2 = loader->pp2;
num_base_points = gloader->base.outline.n_points;
error = af_loader_load_g( loader, scaler, subglyph->index,
load_flags, depth + 1 );
if ( error )
goto Exit;
/* recompute subglyph pointer */
subglyph = gloader->base.subglyphs + num_base_subgs + nn;
if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
{
pp1 = loader->pp1;
pp2 = loader->pp2;
}
else
{
loader->pp1 = pp1;
loader->pp2 = pp2;
}
num_points = gloader->base.outline.n_points;
num_new_points = num_points - num_base_points;
/* now perform the transform required for this subglyph */
if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
FT_SUBGLYPH_FLAG_XY_SCALE |
FT_SUBGLYPH_FLAG_2X2 ) )
{
FT_Vector* cur = gloader->base.outline.points +
num_base_points;
FT_Vector* org = gloader->base.extra_points +
num_base_points;
FT_Vector* limit = cur + num_new_points;
for ( ; cur < limit; cur++, org++ )
{
FT_Vector_Transform( cur, &subglyph->transform );
FT_Vector_Transform( org, &subglyph->transform );
}
}
/* apply offset */
if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
{
FT_Int k = subglyph->arg1;
FT_UInt l = subglyph->arg2;
FT_Vector* p1;
FT_Vector* p2;
if ( start_point + k >= num_base_points ||
l >= (FT_UInt)num_new_points )
{
error = AF_Err_Invalid_Composite;
goto Exit;
}
l += num_base_points;
/* for now, only use the current point coordinates; */
/* we may consider another approach in the near future */
p1 = gloader->base.outline.points + start_point + k;
p2 = gloader->base.outline.points + start_point + l;
x = p1->x - p2->x;
y = p1->y - p2->y;
}
else
{
x = FT_MulFix( subglyph->arg1, hints->x_scale ) + hints->x_delta;
y = FT_MulFix( subglyph->arg2, hints->y_scale ) + hints->y_delta;
x = FT_PIX_ROUND( x );
y = FT_PIX_ROUND( y );
}
{
FT_Outline dummy = gloader->base.outline;
dummy.points += num_base_points;
dummy.n_points = (short)num_new_points;
FT_Outline_Translate( &dummy, x, y );
}
}
}
break;
default:
/* we don't support other formats (yet?) */
error = AF_Err_Unimplemented_Feature;
}
Hint_Metrics:
if ( depth == 0 )
{
FT_BBox bbox;
/* transform the hinted outline if needed */
if ( loader->transformed )
FT_Outline_Transform( &gloader->base.outline, &loader->trans_matrix );
/* we must translate our final outline by -pp1.x and compute */
/* the new metrics */
if ( loader->pp1.x )
FT_Outline_Translate( &gloader->base.outline, -loader->pp1.x, 0 );
FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
bbox.xMin = FT_PIX_FLOOR( bbox.xMin );
bbox.yMin = FT_PIX_FLOOR( bbox.yMin );
bbox.xMax = FT_PIX_CEIL( bbox.xMax );
bbox.yMax = FT_PIX_CEIL( bbox.yMax );
slot->metrics.width = bbox.xMax - bbox.xMin;
slot->metrics.height = bbox.yMax - bbox.yMin;
slot->metrics.horiBearingX = bbox.xMin;
slot->metrics.horiBearingY = bbox.yMax;
/* for mono-width fonts (like Andale, Courier, etc.) we need */
/* to keep the original rounded advance width */
#if 0
if ( !FT_IS_FIXED_WIDTH( slot->face ) )
slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
else
slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
x_scale );
#else
if ( !FT_IS_FIXED_WIDTH( slot->face ) )
slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
else
slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
metrics->scaler.x_scale );
#endif
slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
/* now copy outline into glyph slot */
FT_GlyphLoader_Rewind( internal->loader );
error = FT_GlyphLoader_CopyPoints( internal->loader, gloader );
if ( error )
goto Exit;
slot->outline = internal->loader->base.outline;
slot->format = FT_GLYPH_FORMAT_OUTLINE;
}
#ifdef DEBUG_HINTER
af_debug_hinter = hinter;
#endif
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
af_loader_load_glyph( AF_Loader loader,
FT_Face face,
FT_UInt gindex,
FT_UInt32 load_flags )
{
FT_Error error;
FT_Size size = face->size;
AF_ScalerRec scaler;
if ( !size )
return AF_Err_Invalid_Argument;
FT_ZERO( &scaler );
scaler.face = face;
scaler.x_scale = size->metrics.x_scale;
scaler.x_delta = 0; /* XXX: TODO: add support for sub-pixel hinting */
scaler.y_scale = size->metrics.y_scale;
scaler.y_delta = 0; /* XXX: TODO: add support for sub-pixel hinting */
scaler.render_mode = FT_LOAD_TARGET_MODE( load_flags );
scaler.flags = 0; /* XXX: fix this */
error = af_loader_reset( loader, face );
if ( !error )
{
AF_ScriptMetrics metrics;
error = af_face_globals_get_metrics( loader->globals, gindex,
&metrics );
if ( !error )
{
loader->metrics = metrics;
if ( metrics->clazz->script_metrics_scale )
metrics->clazz->script_metrics_scale( metrics, &scaler );
else
metrics->scaler = scaler;
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM;
load_flags &= ~FT_LOAD_RENDER;
error = metrics->clazz->script_hints_init( &loader->hints, metrics );
if ( error )
goto Exit;
error = af_loader_load_g( loader, &scaler, gindex, load_flags, 0 );
}
}
Exit:
return error;
}
/* END */