Commit cc144f1c authored by David Turner's avatar David Turner
Browse files

adding glyph loader routines (previously in ftobjs.c)

parent 1f7056f5
#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 */
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