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@ -37,6 +37,18 @@ |
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#include <string.h> |
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struct _HB_OT_Layout { |
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const GDEF *gdef; |
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const GSUB *gsub; |
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//const GPOS *gpos;
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struct { |
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unsigned char *klasses; |
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unsigned int len; |
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} new_gdef; |
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}; |
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HB_OT_Layout * |
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hb_ot_layout_create (const char *font_data, |
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int face_index) |
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@ -59,9 +71,25 @@ hb_ot_layout_destroy (HB_OT_Layout *layout) |
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free (layout); |
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} |
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/*
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* GDEF |
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*/ |
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hb_bool_t |
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hb_ot_layout_has_font_glyph_classes (HB_OT_Layout *layout) |
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{ |
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return layout->gdef->has_glyph_classes (); |
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} |
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static hb_bool_t |
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_hb_ot_layout_has_new_glyph_classes (HB_OT_Layout *layout) |
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{ |
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return layout->new_gdef.len > 0; |
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} |
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static hb_ot_layout_glyph_properties_t |
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_hb_ot_layout_get_glyph_properties (HB_OT_Layout *layout, |
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hb_ot_layout_glyph_t glyph) |
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_hb_ot_layout_get_glyph_properties (HB_OT_Layout *layout, |
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hb_glyph_t glyph) |
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{ |
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hb_ot_layout_class_t klass; |
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@ -86,9 +114,68 @@ _hb_ot_layout_get_glyph_properties (HB_OT_Layout *layout, |
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} |
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} |
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#if 0 |
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static bool |
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_hb_ot_layout_check_glyph_properties (HB_OT_Layout *layout, |
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HB_GlyphItem gitem, |
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HB_UShort flags, |
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HB_UShort* property) |
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{ |
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HB_Error error; |
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if ( gdef ) |
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{ |
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HB_UShort basic_glyph_class; |
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HB_UShort desired_attachment_class; |
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if ( gitem->gproperties == HB_GLYPH_PROPERTIES_UNKNOWN ) |
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{ |
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error = HB_GDEF_Get_Glyph_Property( gdef, gitem->gindex, &gitem->gproperties ); |
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if ( error ) |
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return error; |
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} |
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*property = gitem->gproperties; |
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/* If the glyph was found in the MarkAttachmentClass table,
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* then that class value is the high byte of the result, |
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* otherwise the low byte contains the basic type of the glyph |
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* as defined by the GlyphClassDef table. |
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*/ |
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if ( *property & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS ) |
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basic_glyph_class = HB_GDEF_MARK; |
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else |
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basic_glyph_class = *property; |
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/* Return Not_Covered, if, for example, basic_glyph_class
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* is HB_GDEF_LIGATURE and LookFlags includes HB_LOOKUP_FLAG_IGNORE_LIGATURES |
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*/ |
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if ( flags & basic_glyph_class ) |
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return HB_Err_Not_Covered; |
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/* The high byte of LookupFlags has the meaning
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* "ignore marks of attachment type different than |
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* the attachment type specified." |
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*/ |
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desired_attachment_class = flags & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS; |
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if ( desired_attachment_class ) |
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{ |
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if ( basic_glyph_class == HB_GDEF_MARK && |
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*property != desired_attachment_class ) |
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return HB_Err_Not_Covered; |
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} |
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} else { |
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*property = 0; |
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} |
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return HB_Err_Ok; |
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} |
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#endif |
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hb_ot_layout_glyph_class_t |
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hb_ot_layout_get_glyph_class (HB_OT_Layout *layout, |
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hb_ot_layout_glyph_t glyph) |
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hb_ot_layout_get_glyph_class (HB_OT_Layout *layout, |
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hb_glyph_t glyph) |
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{ |
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hb_ot_layout_glyph_properties_t properties; |
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hb_ot_layout_class_t klass; |
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@ -103,23 +190,22 @@ hb_ot_layout_get_glyph_class (HB_OT_Layout *layout, |
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void |
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hb_ot_layout_set_glyph_class (HB_OT_Layout *layout, |
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hb_ot_layout_glyph_t glyph, |
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hb_glyph_t glyph, |
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hb_ot_layout_glyph_class_t klass) |
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{ |
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/* TODO optimize this, similar to old harfbuzz code for example */ |
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/* TODO our semantics are a bit different from old harfbuzz code too */ |
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hb_ot_layout_class_t gdef_klass; |
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int len = layout->new_gdef.len; |
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if (glyph >= len) { |
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int new_len; |
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uint8_t *new_klasses; |
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unsigned char *new_klasses; |
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new_len = len == 0 ? 120 : 2 * len; |
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if (new_len > 65535) |
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new_len = 65535; |
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new_klasses = (uint8_t *) realloc (layout->new_gdef.klasses, new_len * sizeof (uint8_t)); |
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new_klasses = (unsigned char *) realloc (layout->new_gdef.klasses, new_len * sizeof (unsigned char)); |
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if (G_UNLIKELY (!new_klasses)) |
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return; |
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@ -142,3 +228,24 @@ hb_ot_layout_set_glyph_class (HB_OT_Layout *layout, |
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layout->new_gdef.klasses[glyph] = gdef_klass; |
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return; |
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} |
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void |
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hb_ot_layout_build_glyph_classes (HB_OT_Layout *layout, |
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uint16_t num_total_glyphs, |
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hb_glyph_t *glyphs, |
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unsigned char *klasses, |
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uint16_t count) |
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{ |
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int i; |
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if (G_UNLIKELY (!count || !glyphs || !klasses)) |
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return; |
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if (layout->new_gdef.len == 0) { |
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layout->new_gdef.klasses = (unsigned char *) calloc (num_total_glyphs, sizeof (unsigned char)); |
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layout->new_gdef.len = count; |
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} |
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for (i = 0; i < count; i++) |
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hb_ot_layout_set_glyph_class (layout, glyphs[i], (hb_ot_layout_glyph_class_t) klasses[i]); |
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} |
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Behdad Esfahbod
17 years ago