ref: 488cd71e4ba08cd5b1d6076401323e9bb6ee25fd
parent: e608a3e0d2a49c157e4b7af6d8d5d45601ef87ae
author: David Turner <[email protected]>
date: Tue May 2 06:54:12 EDT 2000
a few updates to the OpenType Layout code still far to go, but I'll dedicate most of my time on it next week
--- a/src/otlayout/oltypes.c
+++ b/src/otlayout/oltypes.c
@@ -477,20 +477,138 @@
return result;
}
- /* compute a BaseCoord value */
+ /* extract a BaseCoord value */
LOCAL_FUNC
- TT_Int OTL_Get_Base_Coordinate( TT_Byte* base_coord,
- TT_UShort *format
- TT_UShort *ref_glyph_id,
- TT_Byte* *device )
+ void OTL_Get_Base_Coordinate( TT_Byte* base_coord,
+ OTL_ValueRecord* coord )
{- TT_Byte* p =base_coord;
+ TT_Byte* p = base_coord;
TT_Int result = 0;
- *format = OTL_UShort(p);
-
- switch (*format)
+ coord->format = OTL_UShort(p);
+ coord->coordinate = OTL_Short(p);
+ coord->device = 0;
+
+ switch (coord->format)
{- case
+ case 2: /* format 2 */
+ coord->ref_glyph = OTL_UShort(p);
+ coord->ref_point = OTL_UShort(p);
+ break;
+
+ case 3: /* format 3 */
+ coord->device = p - 4 + OTL_UShort(p);
+ break;
+
+ default:
+ ;
}
}
+
+
+ /* compute size of ValueRecord */
+ LOCAL_FUNC
+ TT_Int OTL_ValueRecord_Size( TT_UShort format )
+ {+ TT_Int count;
+
+ /* each bit in the value format corresponds to a single ushort */
+ /* we thus count the bits, and multiply the result by 2 */
+
+ count = (TT_Int)(format & 0xFF);
+ count = ((count & 0xAA) >> 1) + (count & 0x55);
+ count = ((count & 0xCC) >> 2) + (count & 0x33);
+ count = ((count & 0xF0) >> 4) + (count & 0x0F);
+
+ return count*2;
+ }
+
+
+
+ /* extract ValueRecord */
+ LOCAL_FUNC
+ void OTL_Get_ValueRecord( TT_Byte* value_record,
+ TT_UShort value_format,
+ TT_Byte* pos_table,
+ OTL_ValueRecord* record )
+ {+ TT_Byte* p = value_record;
+
+ /* clear vectors */
+ record->placement.x = 0;
+ record->placement.y = 0;
+ record->advance.x = 0;
+ record->advance.y = 0;
+
+ record->device_pla_x = 0;
+ record->device_pla_y = 0;
+ record->device_adv_x = 0;
+ record->device_adv_y = 0;
+
+ if (value_format & 1) record->placement.x = NEXT_Short(p);
+ if (value_format & 2) record->placement.y = NEXT_Short(p);
+ if (value_format & 4) record->advance.x = NEXT_Short(p);
+ if (value_format & 8) record->advance.y = NEXT_Short(p);
+
+ if (value_format & 16) record->device_pla_x = pos_table + NEXT_UShort(p);
+ if (value_format & 32) record->device_pla_y = pos_table + NEXT_UShort(p);
+ if (value_format & 64) record->device_adv_x = pos_table + NEXT_UShort(p);
+ if (value_format & 128) record->device_adv_y = pos_table + NEXT_UShort(p);
+ }
+
+
+
+ /* extract Anchor */
+ LOCAL_FUNC
+ void OTL_Get_Anchor( TT_Byte* anchor_table,
+ OTL_Anchor* anchor )
+ {+ TT_Byte* p = anchor_table;
+
+ anchor->format = NEXT_UShort(p);
+ anchor->coord.x = NEXT_Short(p);
+ anchor->coord.y = NEXT_Short(p);
+ anchor->point = 0;
+ anchor->device_x = 0;
+ anchor->device_y = 0;
+
+ switch (anchor->format)
+ {+ case 2:
+ anchor->point = NEXT_UShort(p);
+ break;
+
+ case 3:
+ anchor->device_x = anchor_table + NEXT_UShort(p);
+ anchor->device_y = anchor_table + NEXT_UShort(p);
+ break;
+
+ default:
+ ;
+ }
+ }
+
+
+
+ /* extract Mark from MarkArray */
+ LOCAL_FUNC
+ void OTL_Get_Mark( TT_Byte* mark_array,
+ TT_UInt index,
+ TT_UShort* clazz,
+ OTL_Anchor* anchor )
+ {+ TT_Byte* p = mark_array;
+ TT_UInt count;
+
+ *clazz = 0;
+ MEM_Set( anchor, 0, sizeof(*anchor) );
+
+ count = NEXT_UShort(p);
+ if (index < count)
+ {+ p += 4*index;
+ *clazz = NEXT_UShort(p);
+ OTL_Get_Anchor( mark_array + NEXT_UShort(p), anchor );
+ }
+ }
+
--- a/src/otlayout/oltypes.h
+++ b/src/otlayout/oltypes.h
@@ -24,6 +24,7 @@
*
* max_features :: total number of features in table
* feature_tags :: tags of all features for current script/language
+ * features :: selection flags for all features in current script/lang
*
* max_lookups :: total number of lookups in table
* lookups :: selection flags for all lookups for current
@@ -81,6 +82,40 @@
} OTL_Table;
+ typedef struct OTL_BaseCoord_
+ {+ TT_UShort format;
+ TT_Short coordinate;
+ TT_UShort ref_glyph;
+ TT_UShort ref_point;
+ TT_Byte* device;
+
+ } OTL_BaseCoord;
+
+
+ typedef struct OTL_ValueRecord_
+ {+ TT_Vector placement;
+ TT_Vector advance;
+
+ TT_Byte* device_pla_x;
+ TT_Byte* device_pla_y;
+ TT_Byte* device_adv_x;
+ TT_Byte* device_adv_y;
+
+ } OTL_ValueRecord;
+
+
+ typedef struct OTL_Anchor_
+ {+ TT_UInt format;
+ TT_Vector coord;
+ TT_UInt anchor_point;
+ TT_Byte* device_x;
+ TT_Byte* device_y;
+
+ } OTL_Anchor;
+
LOCAL_DEF
TT_Error OTL_Table_Init( OTL_Table* table,
FT_Memory memory );
@@ -222,9 +257,46 @@
+
LOCAL_DEF
TT_Long OTL_Get_Coverage_Index( TT_Byte* coverage,
TT_UInt glyph_id );
+
+ LOCAL_DEF
+ TT_UInt OTL_Get_Glyph_Class( TT_Byte* class_def,
+ TT_UInt glyph_id );
+
+ LOCAL_DEF
+ TT_Int OTL_Get_Device_Adjustment( TT_Byte* device,
+ TT_UInt size );
+
+ LOCAL_DEF
+ void OTL_Get_Base_Coordinate( TT_Byte* base_coord,
+ OTL_BaseCoord* coord );
+
+
+ LOCAL_DEF
+ TT_Int OTL_ValueRecord_Size( TT_UShort value_format );
+
+
+ LOCAL_DEF
+ void OTL_Get_ValueRecord( TT_Byte* value_record,
+ TT_UShort value_format,
+ TT_Byte* pos_table,
+ OTL_ValueRecord* record );
+
+
+ LOCAL_DEF
+ void OTL_Get_Anchor( TT_Byte* anchor_table,
+ OTL_Anchor* anchor );
+
+
+ LOCAL_DEF
+ void OTL_Get_Mark( TT_Byte* mark_array,
+ TT_UInt index,
+ TT_UShort* clazz,
+ OTL_Anchor* anchor );
+
#define OTL_Byte(p) (p++, p[-1])