ref: 2c2b3734e7295c31572cd272d23498f3d50f580c
parent: 44ef8cae0706ff5b79583dfddee3ed5875b2a7e3
author: David Turner <[email protected]>
date: Fri Feb 22 12:58:05 EST 2002
adding glyph loader routines (previously in ftobjs.c)
--- /dev/null
+++ b/src/base/ftgloadr.c
@@ -1,0 +1,343 @@
+#include <ft2build.h>
+#include FT_INTERNAL_GLYPH_LOADER_H
+
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_gloader
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** *****/
+ /***** G L Y P H L O A D E R *****/
+ /***** *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ /*************************************************************************/
+ /* */
+ /* The glyph loader is a simple object which is used to load a set of */
+ /* glyphs easily. It is critical for the correct loading of composites. */
+ /* */
+ /* Ideally, one can see it as a stack of abstract `glyph' objects. */
+ /* */
+ /* loader.base Is really the bottom of the stack. It describes a */
+ /* single glyph image made of the juxtaposition of */
+ /* several glyphs (those `in the stack'). */
+ /* */
+ /* loader.current Describes the top of the stack, on which a new */
+ /* glyph can be loaded. */
+ /* */
+ /* Rewind Clears the stack. */
+ /* Prepare Set up `loader.current' for addition of a new glyph */
+ /* image. */
+ /* Add Add the `current' glyph image to the `base' one, */
+ /* and prepare for another one. */
+ /* */
+ /* The glyph loader is now a base object. Each driver used to */
+ /* re-implement it in one way or the other, which wasted code and */
+ /* energy. */
+ /* */
+ /*************************************************************************/
+
+
+ /* create a new glyph loader */
+ FT_BASE_DEF( FT_Error )
+ FT_GlyphLoader_New( FT_Memory memory,
+ FT_GlyphLoader *aloader )
+ {+ FT_GlyphLoader loader;
+ FT_Error error;
+
+
+ if ( !ALLOC( loader, sizeof ( *loader ) ) )
+ {+ loader->memory = memory;
+ *aloader = loader;
+ }
+ return error;
+ }
+
+
+ /* rewind the glyph loader - reset counters to 0 */
+ FT_BASE_DEF( void )
+ FT_GlyphLoader_Rewind( FT_GlyphLoader loader )
+ {+ FT_GlyphLoad* base = &loader->base;
+ FT_GlyphLoad* current = &loader->current;
+
+
+ base->outline.n_points = 0;
+ base->outline.n_contours = 0;
+ base->num_subglyphs = 0;
+
+ *current = *base;
+ }
+
+
+ /* reset the glyph loader, frees all allocated tables */
+ /* and starts from zero */
+ FT_BASE_DEF( void )
+ FT_GlyphLoader_Reset( FT_GlyphLoader loader )
+ {+ FT_Memory memory = loader->memory;
+
+
+ FREE( loader->base.outline.points );
+ FREE( loader->base.outline.tags );
+ FREE( loader->base.outline.contours );
+ FREE( loader->base.extra_points );
+ FREE( loader->base.subglyphs );
+
+ loader->max_points = 0;
+ loader->max_contours = 0;
+ loader->max_subglyphs = 0;
+
+ FT_GlyphLoader_Rewind( loader );
+ }
+
+
+ /* delete a glyph loader */
+ FT_BASE_DEF( void )
+ FT_GlyphLoader_Done( FT_GlyphLoader loader )
+ {+ if ( loader )
+ {+ FT_Memory memory = loader->memory;
+
+
+ FT_GlyphLoader_Reset( loader );
+ FREE( loader );
+ }
+ }
+
+
+ /* re-adjust the `current' outline fields */
+ static void
+ FT_GlyphLoader_Adjust_Points( FT_GlyphLoader loader )
+ {+ FT_Outline* base = &loader->base.outline;
+ FT_Outline* current = &loader->current.outline;
+
+
+ current->points = base->points + base->n_points;
+ current->tags = base->tags + base->n_points;
+ current->contours = base->contours + base->n_contours;
+
+ /* handle extra points table - if any */
+ if ( loader->use_extra )
+ loader->current.extra_points =
+ loader->base.extra_points + base->n_points;
+ }
+
+
+ FT_BASE_DEF( FT_Error )
+ FT_GlyphLoader_Create_Extra( FT_GlyphLoader loader )
+ {+ FT_Error error;
+ FT_Memory memory = loader->memory;
+
+
+ if ( !ALLOC_ARRAY( loader->base.extra_points,
+ loader->max_points, FT_Vector ) )
+ {+ loader->use_extra = 1;
+ FT_GlyphLoader_Adjust_Points( loader );
+ }
+ return error;
+ }
+
+
+ /* re-adjust the `current' subglyphs field */
+ static void
+ FT_GlyphLoader_Adjust_Subglyphs( FT_GlyphLoader loader )
+ {+ FT_GlyphLoad* base = &loader->base;
+ FT_GlyphLoad* current = &loader->current;
+
+
+ current->subglyphs = base->subglyphs + base->num_subglyphs;
+ }
+
+
+ /* Ensure that we can add `n_points' and `n_contours' to our glyph. this */
+ /* function reallocates its outline tables if necessary. Note that it */
+ /* DOESN'T change the number of points within the loader! */
+ /* */
+ FT_BASE_DEF( FT_Error )
+ FT_GlyphLoader_Check_Points( FT_GlyphLoader loader,
+ FT_UInt n_points,
+ FT_UInt n_contours )
+ {+ FT_Memory memory = loader->memory;
+ FT_Error error = FT_Err_Ok;
+ FT_Outline* base = &loader->base.outline;
+ FT_Outline* current = &loader->current.outline;
+ FT_Bool adjust = 1;
+
+ FT_UInt new_max, old_max;
+
+
+ /* check points & tags */
+ new_max = base->n_points + current->n_points + n_points;
+ old_max = loader->max_points;
+
+ if ( new_max > old_max )
+ {+ new_max = ( new_max + 7 ) & -8;
+
+ if ( REALLOC_ARRAY( base->points, old_max, new_max, FT_Vector ) ||
+ REALLOC_ARRAY( base->tags, old_max, new_max, FT_Byte ) )
+ goto Exit;
+
+ if ( loader->use_extra &&
+ REALLOC_ARRAY( loader->base.extra_points, old_max,
+ new_max, FT_Vector ) )
+ goto Exit;
+
+ adjust = 1;
+ loader->max_points = new_max;
+ }
+
+ /* check contours */
+ old_max = loader->max_contours;
+ new_max = base->n_contours + current->n_contours +
+ n_contours;
+ if ( new_max > old_max )
+ {+ new_max = ( new_max + 3 ) & -4;
+ if ( REALLOC_ARRAY( base->contours, old_max, new_max, FT_Short ) )
+ goto Exit;
+
+ adjust = 1;
+ loader->max_contours = new_max;
+ }
+
+ if ( adjust )
+ FT_GlyphLoader_Adjust_Points( loader );
+
+ Exit:
+ return error;
+ }
+
+
+ /* Ensure that we can add `n_subglyphs' to our glyph. this function */
+ /* reallocates its subglyphs table if necessary. Note that it DOES */
+ /* NOT change the number of subglyphs within the loader! */
+ /* */
+ FT_BASE_DEF( FT_Error )
+ FT_GlyphLoader_Check_Subglyphs( FT_GlyphLoader loader,
+ FT_UInt n_subs )
+ {+ FT_Memory memory = loader->memory;
+ FT_Error error = FT_Err_Ok;
+ FT_UInt new_max, old_max;
+
+ FT_GlyphLoad* base = &loader->base;
+ FT_GlyphLoad* current = &loader->current;
+
+
+ new_max = base->num_subglyphs + current->num_subglyphs + n_subs;
+ old_max = loader->max_subglyphs;
+ if ( new_max > old_max )
+ {+ new_max = ( new_max + 1 ) & -2;
+ if ( REALLOC_ARRAY( base->subglyphs, old_max, new_max, FT_SubGlyph ) )
+ goto Exit;
+
+ loader->max_subglyphs = new_max;
+
+ FT_GlyphLoader_Adjust_Subglyphs( loader );
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ /* prepare loader for the addition of a new glyph on top of the base one */
+ FT_BASE_DEF( void )
+ FT_GlyphLoader_Prepare( FT_GlyphLoader loader )
+ {+ FT_GlyphLoad* current = &loader->current;
+
+
+ current->outline.n_points = 0;
+ current->outline.n_contours = 0;
+ current->num_subglyphs = 0;
+
+ FT_GlyphLoader_Adjust_Points ( loader );
+ FT_GlyphLoader_Adjust_Subglyphs( loader );
+ }
+
+
+ /* add current glyph to the base image - and prepare for another */
+ FT_BASE_DEF( void )
+ FT_GlyphLoader_Add( FT_GlyphLoader loader )
+ {+ FT_GlyphLoad* base = &loader->base;
+ FT_GlyphLoad* current = &loader->current;
+
+ FT_UInt n_curr_contours = current->outline.n_contours;
+ FT_UInt n_base_points = base->outline.n_points;
+ FT_UInt n;
+
+
+ base->outline.n_points =
+ (short)( base->outline.n_points + current->outline.n_points );
+ base->outline.n_contours =
+ (short)( base->outline.n_contours + current->outline.n_contours );
+
+ base->num_subglyphs += current->num_subglyphs;
+
+ /* adjust contours count in newest outline */
+ for ( n = 0; n < n_curr_contours; n++ )
+ current->outline.contours[n] =
+ (short)( current->outline.contours[n] + n_base_points );
+
+ /* prepare for another new glyph image */
+ FT_GlyphLoader_Prepare( loader );
+ }
+
+
+ FT_BASE_DEF( FT_Error )
+ FT_GlyphLoader_Copy_Points( FT_GlyphLoader target,
+ FT_GlyphLoader source )
+ {+ FT_Error error;
+ FT_UInt num_points = source->base.outline.n_points;
+ FT_UInt num_contours = source->base.outline.n_contours;
+
+
+ error = FT_GlyphLoader_Check_Points( target, num_points, num_contours );
+ if ( !error )
+ {+ FT_Outline* out = &target->base.outline;
+ FT_Outline* in = &source->base.outline;
+
+
+ MEM_Copy( out->points, in->points,
+ num_points * sizeof ( FT_Vector ) );
+ MEM_Copy( out->tags, in->tags,
+ num_points * sizeof ( char ) );
+ MEM_Copy( out->contours, in->contours,
+ num_contours * sizeof ( short ) );
+
+ /* do we need to copy the extra points? */
+ if ( target->use_extra && source->use_extra )
+ MEM_Copy( target->base.extra_points, source->base.extra_points,
+ num_points * sizeof ( FT_Vector ) );
+
+ out->n_points = (short)num_points;
+ out->n_contours = (short)num_contours;
+
+ FT_GlyphLoader_Adjust_Points( target );
+ }
+
+ return error;
+ }
+
+
+/* END */