438 lines
14 KiB
C
438 lines
14 KiB
C
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#include "afmodule.h"
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#include "afhints.h"
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#include "afglobal.h"
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#include "aflatin.h"
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static FT_Error
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af_hinter_load( AF_Hinter hinter,
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FT_UInt glyph_index,
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FT_Int32 load_flags,
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FT_UInt depth )
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{
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FT_Face face = hinter->face;
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FT_GlyphSlot slot = face->glyph;
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FT_Slot_Internal internal = slot->internal;
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FT_Fixed x_scale = hinter->globals->x_scale;
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FT_Fixed y_scale = hinter->globals->y_scale;
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FT_Error error;
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AF_Outline outline = hinter->glyph;
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AF_Loader gloader = hinter->loader;
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/* load the glyph */
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error = FT_Load_Glyph( face, glyph_index, load_flags );
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if ( error )
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goto Exit;
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/* Set `hinter->transformed' after loading with FT_LOAD_NO_RECURSE. */
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hinter->transformed = internal->glyph_transformed;
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if ( hinter->transformed )
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{
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FT_Matrix imatrix;
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imatrix = internal->glyph_matrix;
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hinter->trans_delta = internal->glyph_delta;
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hinter->trans_matrix = imatrix;
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FT_Matrix_Invert( &imatrix );
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FT_Vector_Transform( &hinter->trans_delta, &imatrix );
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}
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/* set linear horizontal metrics */
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slot->linearHoriAdvance = slot->metrics.horiAdvance;
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slot->linearVertAdvance = slot->metrics.vertAdvance;
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switch ( slot->format )
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{
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case FT_GLYPH_FORMAT_OUTLINE:
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/* translate glyph outline if we need to */
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if ( hinter->transformed )
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{
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FT_UInt n = slot->outline.n_points;
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FT_Vector* point = slot->outline.points;
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for ( ; n > 0; point++, n-- )
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{
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point->x += hinter->trans_delta.x;
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point->y += hinter->trans_delta.y;
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}
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}
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/* copy the outline points in the loader's current */
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/* extra points which is used to keep original glyph coordinates */
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error = af_loader_check_points( gloader, slot->outline.n_points + 2,
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slot->outline.n_contours );
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if ( error )
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goto Exit;
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FT_ARRAY_COPY( gloader->current.extra_points, slot->outline.points,
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slot->outline.n_points );
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FT_ARRAY_COPY( gloader->current.outline.contours, slot->outline.contours,
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slot->outline.n_contours );
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FT_ARRAY_COPY( gloader->current.outline.tags, slot->outline.tags,
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slot->outline.n_points );
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gloader->current.outline.n_points = slot->outline.n_points;
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gloader->current.outline.n_contours = slot->outline.n_contours;
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/* compute original phantom points */
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hinter->pp1.x = 0;
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hinter->pp1.y = 0;
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hinter->pp2.x = FT_MulFix( slot->metrics.horiAdvance, x_scale );
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hinter->pp2.y = 0;
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/* be sure to check for spacing glyphs */
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if ( slot->outline.n_points == 0 )
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goto Hint_Metrics;
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/* now load the slot image into the auto-outline and run the */
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/* automatic hinting process */
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error = af_outline_load( outline, x_scale, y_scale, face );
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if ( error )
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goto Exit;
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/* perform feature detection */
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af_outline_detect_features( outline );
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if ( hinter->do_vert_hints )
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{
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af_outline_compute_blue_edges( outline, hinter->globals );
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af_outline_scale_blue_edges( outline, hinter->globals );
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}
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/* perform alignment control */
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af_hinter_hint_edges( hinter );
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af_hinter_align( hinter );
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/* now save the current outline into the loader's current table */
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af_outline_save( outline, gloader );
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/* we now need to hint the metrics according to the change in */
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/* width/positioning that occured during the hinting process */
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{
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FT_Pos old_advance, old_rsb, old_lsb, new_lsb;
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AF_Edge edge1 = outline->vert_edges; /* leftmost edge */
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AF_Edge edge2 = edge1 +
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outline->num_vedges - 1; /* rightmost edge */
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old_advance = hinter->pp2.x;
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old_rsb = old_advance - edge2->opos;
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old_lsb = edge1->opos;
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new_lsb = edge1->pos;
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hinter->pp1.x = FT_PIX_ROUND( new_lsb - old_lsb );
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hinter->pp2.x = FT_PIX_ROUND( edge2->pos + old_rsb );
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#if 0
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/* try to fix certain bad advance computations */
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if ( hinter->pp2.x + hinter->pp1.x == edge2->pos && old_rsb > 4 )
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hinter->pp2.x += 64;
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#endif
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}
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/* good, we simply add the glyph to our loader's base */
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af_loader_add( gloader );
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break;
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case FT_GLYPH_FORMAT_COMPOSITE:
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{
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FT_UInt nn, num_subglyphs = slot->num_subglyphs;
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FT_UInt num_base_subgs, start_point;
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FT_SubGlyph subglyph;
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start_point = gloader->base.outline.n_points;
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/* first of all, copy the subglyph descriptors in the glyph loader */
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error = af_loader_check_subglyphs( gloader, num_subglyphs );
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if ( error )
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goto Exit;
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FT_ARRAY_COPY( gloader->current.subglyphs, slot->subglyphs,
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num_subglyphs );
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gloader->current.num_subglyphs = num_subglyphs;
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num_base_subgs = gloader->base.num_subglyphs;
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/* now, read each subglyph independently */
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for ( nn = 0; nn < num_subglyphs; nn++ )
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{
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FT_Vector pp1, pp2;
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FT_Pos x, y;
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FT_UInt num_points, num_new_points, num_base_points;
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/* gloader.current.subglyphs can change during glyph loading due */
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/* to re-allocation -- we must recompute the current subglyph on */
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/* each iteration */
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subglyph = gloader->base.subglyphs + num_base_subgs + nn;
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pp1 = hinter->pp1;
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pp2 = hinter->pp2;
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num_base_points = gloader->base.outline.n_points;
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error = af_hinter_load( hinter, subglyph->index,
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load_flags, depth + 1 );
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if ( error )
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goto Exit;
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/* recompute subglyph pointer */
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subglyph = gloader->base.subglyphs + num_base_subgs + nn;
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if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
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{
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pp1 = hinter->pp1;
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pp2 = hinter->pp2;
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}
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else
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{
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hinter->pp1 = pp1;
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hinter->pp2 = pp2;
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}
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num_points = gloader->base.outline.n_points;
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num_new_points = num_points - num_base_points;
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/* now perform the transform required for this subglyph */
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if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
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FT_SUBGLYPH_FLAG_XY_SCALE |
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FT_SUBGLYPH_FLAG_2X2 ) )
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{
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FT_Vector* cur = gloader->base.outline.points +
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num_base_points;
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FT_Vector* org = gloader->base.extra_points +
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num_base_points;
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FT_Vector* limit = cur + num_new_points;
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for ( ; cur < limit; cur++, org++ )
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{
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FT_Vector_Transform( cur, &subglyph->transform );
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FT_Vector_Transform( org, &subglyph->transform );
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}
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}
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/* apply offset */
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if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
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{
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FT_Int k = subglyph->arg1;
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FT_UInt l = subglyph->arg2;
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FT_Vector* p1;
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FT_Vector* p2;
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if ( start_point + k >= num_base_points ||
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l >= (FT_UInt)num_new_points )
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{
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error = AF_Err_Invalid_Composite;
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goto Exit;
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}
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l += num_base_points;
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/* for now, only use the current point coordinates; */
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/* we may consider another approach in the near future */
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p1 = gloader->base.outline.points + start_point + k;
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p2 = gloader->base.outline.points + start_point + l;
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x = p1->x - p2->x;
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y = p1->y - p2->y;
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}
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else
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{
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x = FT_MulFix( subglyph->arg1, x_scale );
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y = FT_MulFix( subglyph->arg2, y_scale );
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x = FT_PIX_ROUND(x);
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y = FT_PIX_ROUND(y);
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}
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{
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FT_Outline dummy = gloader->base.outline;
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dummy.points += num_base_points;
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dummy.n_points = (short)num_new_points;
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FT_Outline_Translate( &dummy, x, y );
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}
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}
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}
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break;
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default:
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/* we don't support other formats (yet?) */
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error = AF_Err_Unimplemented_Feature;
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}
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Hint_Metrics:
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if ( depth == 0 )
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{
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FT_BBox bbox;
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/* transform the hinted outline if needed */
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if ( hinter->transformed )
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FT_Outline_Transform( &gloader->base.outline, &hinter->trans_matrix );
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/* we must translate our final outline by -pp1.x and compute */
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/* the new metrics */
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if ( hinter->pp1.x )
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FT_Outline_Translate( &gloader->base.outline, -hinter->pp1.x, 0 );
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FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
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bbox.xMin = FT_PIX_FLOOR( bbox.xMin );
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bbox.yMin = FT_PIX_FLOOR( bbox.yMin );
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bbox.xMax = FT_PIX_CEIL( bbox.xMax );
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bbox.yMax = FT_PIX_CEIL( bbox.yMax );
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slot->metrics.width = bbox.xMax - bbox.xMin;
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slot->metrics.height = bbox.yMax - bbox.yMin;
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slot->metrics.horiBearingX = bbox.xMin;
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slot->metrics.horiBearingY = bbox.yMax;
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/* for mono-width fonts (like Andale, Courier, etc.) we need */
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/* to keep the original rounded advance width */
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if ( !FT_IS_FIXED_WIDTH( slot->face ) )
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slot->metrics.horiAdvance = hinter->pp2.x - hinter->pp1.x;
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else
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slot->metrics.horiAdvance = FT_MulFix( slot->metrics.horiAdvance,
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x_scale );
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slot->metrics.horiAdvance = FT_PIX_ROUND( slot->metrics.horiAdvance );
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/* now copy outline into glyph slot */
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af_loader_rewind( slot->internal->loader );
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error = af_loader_copy_points( slot->internal->loader, gloader );
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if ( error )
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goto Exit;
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slot->outline = slot->internal->loader->base.outline;
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slot->format = FT_GLYPH_FORMAT_OUTLINE;
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}
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#ifdef DEBUG_HINTER
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af_debug_hinter = hinter;
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#endif
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Exit:
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return error;
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}
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/* load and hint a given glyph */
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FT_LOCAL_DEF( FT_Error )
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af_hinter_load_glyph( AF_Hinter hinter,
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FT_GlyphSlot slot,
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FT_Size size,
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FT_UInt glyph_index,
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FT_Int32 load_flags )
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{
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FT_Face face = slot->face;
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FT_Error error;
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FT_Fixed x_scale = size->metrics.x_scale;
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FT_Fixed y_scale = size->metrics.y_scale;
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AF_Face_Globals face_globals = FACE_GLOBALS( face );
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FT_Render_Mode hint_mode = FT_LOAD_TARGET_MODE( load_flags );
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/* first of all, we need to check that we're using the correct face and */
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/* global hints to load the glyph */
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if ( hinter->face != face || hinter->globals != face_globals )
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{
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hinter->face = face;
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if ( !face_globals )
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{
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error = af_hinter_new_face_globals( hinter, face, 0 );
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if ( error )
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goto Exit;
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}
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hinter->globals = FACE_GLOBALS( face );
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face_globals = FACE_GLOBALS( face );
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}
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#ifdef FT_CONFIG_CHESTER_BLUE_SCALE
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/* try to optimize the y_scale so that the top of non-capital letters
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* is aligned on a pixel boundary whenever possible
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*/
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{
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AF_Globals design = &face_globals->design;
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FT_Pos shoot = design->blue_shoots[AF_BLUE_SMALL_TOP];
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/* 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;
|
||
|
|
}
|