ref: fd20da4b7581eea5c6dd8212441a603c69186543
dir: /src/autofit/afmodule.c/
#include "afmodule.h"
#include "afhints.h"
#include "afglobal.h"
#include "aflatin.h"
static FT_Error
af_hinter_load( AF_Hinter hinter,
FT_UInt glyph_index,
FT_Int32 load_flags,
FT_UInt depth )
{
FT_Face face = hinter->face;
FT_GlyphSlot slot = face->glyph;
FT_Slot_Internal internal = slot->internal;
FT_Fixed x_scale = hinter->globals->x_scale;
FT_Fixed y_scale = hinter->globals->y_scale;
FT_Error error;
AF_Outline outline = hinter->glyph;
AF_Loader gloader = hinter->loader;
/* load the glyph */
error = FT_Load_Glyph( face, glyph_index, load_flags );
if ( error )
goto Exit;
/* Set `hinter->transformed' after loading with FT_LOAD_NO_RECURSE. */
hinter->transformed = internal->glyph_transformed;
if ( hinter->transformed )
{
FT_Matrix imatrix;
imatrix = internal->glyph_matrix;
hinter->trans_delta = internal->glyph_delta;
hinter->trans_matrix = imatrix;
FT_Matrix_Invert( &imatrix );
FT_Vector_Transform( &hinter->trans_delta, &imatrix );
}
/* set linear horizontal metrics */
slot->linearHoriAdvance = slot->metrics.horiAdvance;
slot->linearVertAdvance = slot->metrics.vertAdvance;
switch ( slot->format )
{
case FT_GLYPH_FORMAT_OUTLINE:
/* translate glyph outline if we need to */
if ( hinter->transformed )
{
FT_UInt n = slot->outline.n_points;
FT_Vector* point = slot->outline.points;
for ( ; n > 0; point++, n-- )
{
point->x += hinter->trans_delta.x;
point->y += hinter->trans_delta.y;
}
}
/* copy the outline points in the loader's current */
/* extra points which is used to keep original glyph coordinates */
error = af_loader_check_points( gloader, slot->outline.n_points + 2,
slot->outline.n_contours );
if ( error )
goto Exit;
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 phantom points */
hinter->pp1.x = 0;
hinter->pp1.y = 0;
hinter->pp2.x = FT_MulFix( slot->metrics.horiAdvance, x_scale );
hinter->pp2.y = 0;
/* 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 */
error = af_outline_load( outline, x_scale, y_scale, face );
if ( error )
goto Exit;
/* perform feature detection */
af_outline_detect_features( outline );
if ( hinter->do_vert_hints )
{
af_outline_compute_blue_edges( outline, hinter->globals );
af_outline_scale_blue_edges( outline, hinter->globals );
}
/* perform alignment control */
af_hinter_hint_edges( hinter );
af_hinter_align( hinter );
/* now save the current outline into the loader's current table */
af_outline_save( outline, gloader );
/* 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;
AF_Edge edge1 = outline->vert_edges; /* leftmost edge */
AF_Edge edge2 = edge1 +
outline->num_vedges - 1; /* rightmost edge */
old_advance = hinter->pp2.x;
old_rsb = old_advance - edge2->opos;
old_lsb = edge1->opos;
new_lsb = edge1->pos;
hinter->pp1.x = FT_PIX_ROUND( new_lsb - old_lsb );
hinter->pp2.x = FT_PIX_ROUND( edge2->pos + old_rsb );
#if 0
/* try to fix certain bad advance computations */
if ( hinter->pp2.x + hinter->pp1.x == edge2->pos && old_rsb > 4 )
hinter->pp2.x += 64;
#endif
}
/* good, we simply add the glyph to our loader's base */
af_loader_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 = af_loader_check_subglyphs( 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 = hinter->pp1;
pp2 = hinter->pp2;
num_base_points = gloader->base.outline.n_points;
error = af_hinter_load( hinter, 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 = hinter->pp1;
pp2 = hinter->pp2;
}
else
{
hinter->pp1 = pp1;
hinter->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, x_scale );
y = FT_MulFix( subglyph->arg2, y_scale );
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 ( hinter->transformed )
FT_Outline_Transform( &gloader->base.outline, &hinter->trans_matrix );
/* we must translate our final outline by -pp1.x and compute */
/* the new metrics */
if ( hinter->pp1.x )
FT_Outline_Translate( &gloader->base.outline, -hinter->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 ( !FT_IS_FIXED_WIDTH( slot->face ) )
slot->metrics.horiAdvance = hinter->pp2.x - hinter->pp1.x;
else
slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
x_scale );
slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
/* now copy outline into glyph slot */
af_loader_rewind( slot->internal->loader );
error = af_loader_copy_points( slot->internal->loader, gloader );
if ( error )
goto Exit;
slot->outline = slot->internal->loader->base.outline;
slot->format = FT_GLYPH_FORMAT_OUTLINE;
}
#ifdef DEBUG_HINTER
af_debug_hinter = hinter;
#endif
Exit:
return error;
}
/* load and hint a given glyph */
FT_LOCAL_DEF( FT_Error )
af_hinter_load_glyph( AF_Hinter hinter,
FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int32 load_flags )
{
FT_Face face = slot->face;
FT_Error error;
FT_Fixed x_scale = size->metrics.x_scale;
FT_Fixed y_scale = size->metrics.y_scale;
AF_Face_Globals face_globals = FACE_GLOBALS( face );
FT_Render_Mode hint_mode = FT_LOAD_TARGET_MODE( load_flags );
/* first of all, we need to check that we're using the correct face and */
/* global hints to load the glyph */
if ( hinter->face != face || hinter->globals != face_globals )
{
hinter->face = face;
if ( !face_globals )
{
error = af_hinter_new_face_globals( hinter, face, 0 );
if ( error )
goto Exit;
}
hinter->globals = FACE_GLOBALS( face );
face_globals = FACE_GLOBALS( face );
}
#ifdef FT_CONFIG_CHESTER_BLUE_SCALE
/* try to optimize the y_scale so that the top of non-capital letters
* is aligned on a pixel boundary whenever possible
*/
{
AF_Globals design = &face_globals->design;
FT_Pos shoot = design->blue_shoots[AF_BLUE_SMALL_TOP];
/* the value of 'shoot' will be -1000 if the font doesn't have */
/* small latin letters; we simply check the sign here... */
if ( shoot > 0 )
{
FT_Pos scaled = FT_MulFix( shoot, y_scale );
FT_Pos fitted = FT_PIX_ROUND( scaled );
if ( scaled != fitted )
{
/* adjust y_scale
*/
y_scale = FT_MulDiv( y_scale, fitted, scaled );
/* adust x_scale
*/
if ( fitted < scaled )
x_scale -= x_scale / 50; /* x_scale*0.98 with integers */
}
}
}
#endif /* FT_CONFIG_CHESTER_BLUE_SCALE */
/* now, we must check the current character pixel size to see if we */
/* need to rescale the global metrics */
if ( face_globals->x_scale != x_scale ||
face_globals->y_scale != y_scale )
af_hinter_scale_globals( hinter, x_scale, y_scale );
af_loader_rewind( hinter->loader );
/* reset hinting flags according to load flags and current render target */
hinter->do_horz_hints = FT_BOOL( !(load_flags & FT_LOAD_NO_AUTOHINT) );
hinter->do_vert_hints = FT_BOOL( !(load_flags & FT_LOAD_NO_AUTOHINT) );
#ifdef DEBUG_HINTER
hinter->do_horz_hints = !af_debug_disable_vert; /* not a bug, the meaning */
hinter->do_vert_hints = !af_debug_disable_horz; /* of h/v is inverted! */
#endif
/* we snap the width of vertical stems for the monochrome and */
/* horizontal LCD rendering targets only. Corresponds to X snapping. */
hinter->do_horz_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_MONO ||
hint_mode == FT_RENDER_MODE_LCD );
/* we snap the width of horizontal stems for the monochrome and */
/* vertical LCD rendering targets only. Corresponds to Y snapping. */
hinter->do_vert_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_MONO ||
hint_mode == FT_RENDER_MODE_LCD_V );
hinter->do_stem_adjust = FT_BOOL( hint_mode != FT_RENDER_MODE_LIGHT );
load_flags |= FT_LOAD_NO_SCALE
| FT_LOAD_IGNORE_TRANSFORM;
load_flags &= ~FT_LOAD_RENDER;
error = af_hinter_load( hinter, glyph_index, load_flags, 0 );
Exit:
return error;
}