#include "afloader.h" | |
#include "afhints.h" | |
#include "afglobal.h" | |
#include "aflatin.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 = 0; | |
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 ) | |
{ | |
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 = 0; | |
FT_Face face = loader->face; | |
AF_FaceGlobals globals = loader->globals; | |
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_Vector* point = slot->outline.points; | |
FT_Vector* limit = point + slot->outline.n_points; | |
for ( ; point < limit; point++ ) | |
{ | |
point->x += loader->trans_delta.x; | |
point->y += 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_CheckPoints( gloader, | |
slot->outline.n_points + 2, | |
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 phantom points */ | |
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 */ | |
error = metrics->clazz->script_hints_init( hints, | |
&gloader->current.outline, | |
metrics ); | |
if ( error ) | |
goto Exit; | |
/* apply the hints */ | |
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; | |
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 */ | |
old_advance = loader->pp2.x; | |
old_rsb = old_advance - edge2->opos; | |
old_lsb = edge1->opos; | |
new_lsb = edge1->pos; | |
loader->pp1.x = FT_PIX_ROUND( new_lsb - old_lsb ); | |
loader->pp2.x = FT_PIX_ROUND( edge2->pos + old_rsb ); | |
#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 | |
} | |
/* 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 = FT_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 = FT_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 | |
slot->metrics.horiAdvance = loader->pp2.x - loader->pp1.x; | |
#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 FT_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; | |
metrics->scaler = scaler; | |
if ( metrics->clazz->script_metrics_scale ) | |
metrics->clazz->script_metrics_scale( metrics, &scaler ); | |
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_IGNORE_TRANSFORM; | |
load_flags &= ~FT_LOAD_RENDER; | |
error = af_loader_load_g( loader, &scaler, gindex, load_flags, 0 ); | |
} | |
} | |
return error; | |
} |