adding glyph loader routines (previously in ftobjs.c)
This commit is contained in:
David Turner
parent
1f7056f5e5
commit
cc144f1c8d
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#include <ft2build.h>
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#include FT_INTERNAL_GLYPH_LOADER_H
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_gloader
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** *****/
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/***** G L Y P H L O A D E R *****/
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/***** *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* The glyph loader is a simple object which is used to load a set of */
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/* glyphs easily. It is critical for the correct loading of composites. */
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/* */
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/* Ideally, one can see it as a stack of abstract `glyph' objects. */
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/* */
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/* loader.base Is really the bottom of the stack. It describes a */
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/* single glyph image made of the juxtaposition of */
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/* several glyphs (those `in the stack'). */
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/* */
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/* loader.current Describes the top of the stack, on which a new */
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/* glyph can be loaded. */
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/* */
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/* Rewind Clears the stack. */
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/* Prepare Set up `loader.current' for addition of a new glyph */
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/* image. */
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/* Add Add the `current' glyph image to the `base' one, */
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/* and prepare for another one. */
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/* */
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/* The glyph loader is now a base object. Each driver used to */
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/* re-implement it in one way or the other, which wasted code and */
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/* energy. */
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/* */
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/*************************************************************************/
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/* create a new glyph loader */
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FT_BASE_DEF( FT_Error )
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FT_GlyphLoader_New( FT_Memory memory,
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FT_GlyphLoader *aloader )
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{
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FT_GlyphLoader loader;
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FT_Error error;
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if ( !ALLOC( loader, sizeof ( *loader ) ) )
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{
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loader->memory = memory;
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*aloader = loader;
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}
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return error;
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}
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/* rewind the glyph loader - reset counters to 0 */
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FT_BASE_DEF( void )
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FT_GlyphLoader_Rewind( FT_GlyphLoader loader )
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{
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FT_GlyphLoad* base = &loader->base;
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FT_GlyphLoad* current = &loader->current;
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base->outline.n_points = 0;
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base->outline.n_contours = 0;
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base->num_subglyphs = 0;
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*current = *base;
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}
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/* reset the glyph loader, frees all allocated tables */
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/* and starts from zero */
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FT_BASE_DEF( void )
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FT_GlyphLoader_Reset( FT_GlyphLoader loader )
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{
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FT_Memory memory = loader->memory;
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FREE( loader->base.outline.points );
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FREE( loader->base.outline.tags );
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FREE( loader->base.outline.contours );
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FREE( loader->base.extra_points );
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FREE( loader->base.subglyphs );
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loader->max_points = 0;
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loader->max_contours = 0;
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loader->max_subglyphs = 0;
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FT_GlyphLoader_Rewind( loader );
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}
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/* delete a glyph loader */
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FT_BASE_DEF( void )
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FT_GlyphLoader_Done( FT_GlyphLoader loader )
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{
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if ( loader )
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{
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FT_Memory memory = loader->memory;
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FT_GlyphLoader_Reset( loader );
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FREE( loader );
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}
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}
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/* re-adjust the `current' outline fields */
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static void
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FT_GlyphLoader_Adjust_Points( FT_GlyphLoader loader )
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{
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FT_Outline* base = &loader->base.outline;
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FT_Outline* current = &loader->current.outline;
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current->points = base->points + base->n_points;
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current->tags = base->tags + base->n_points;
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current->contours = base->contours + base->n_contours;
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/* handle extra points table - if any */
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if ( loader->use_extra )
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loader->current.extra_points =
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loader->base.extra_points + base->n_points;
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}
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FT_BASE_DEF( FT_Error )
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FT_GlyphLoader_Create_Extra( FT_GlyphLoader loader )
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{
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FT_Error error;
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FT_Memory memory = loader->memory;
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if ( !ALLOC_ARRAY( loader->base.extra_points,
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loader->max_points, FT_Vector ) )
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{
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loader->use_extra = 1;
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FT_GlyphLoader_Adjust_Points( loader );
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}
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return error;
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}
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/* re-adjust the `current' subglyphs field */
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static void
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FT_GlyphLoader_Adjust_Subglyphs( FT_GlyphLoader loader )
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{
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FT_GlyphLoad* base = &loader->base;
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FT_GlyphLoad* current = &loader->current;
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current->subglyphs = base->subglyphs + base->num_subglyphs;
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}
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/* Ensure that we can add `n_points' and `n_contours' to our glyph. this */
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/* function reallocates its outline tables if necessary. Note that it */
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/* DOESN'T change the number of points within the loader! */
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/* */
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FT_BASE_DEF( FT_Error )
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FT_GlyphLoader_Check_Points( FT_GlyphLoader loader,
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FT_UInt n_points,
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FT_UInt n_contours )
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{
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FT_Memory memory = loader->memory;
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FT_Error error = FT_Err_Ok;
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FT_Outline* base = &loader->base.outline;
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FT_Outline* current = &loader->current.outline;
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FT_Bool adjust = 1;
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FT_UInt new_max, old_max;
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/* check points & tags */
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new_max = base->n_points + current->n_points + n_points;
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old_max = loader->max_points;
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if ( new_max > old_max )
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{
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new_max = ( new_max + 7 ) & -8;
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if ( REALLOC_ARRAY( base->points, old_max, new_max, FT_Vector ) ||
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REALLOC_ARRAY( base->tags, old_max, new_max, FT_Byte ) )
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goto Exit;
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if ( loader->use_extra &&
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REALLOC_ARRAY( loader->base.extra_points, old_max,
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new_max, FT_Vector ) )
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goto Exit;
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adjust = 1;
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loader->max_points = new_max;
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}
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/* check contours */
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old_max = loader->max_contours;
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new_max = base->n_contours + current->n_contours +
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n_contours;
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if ( new_max > old_max )
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{
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new_max = ( new_max + 3 ) & -4;
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if ( REALLOC_ARRAY( base->contours, old_max, new_max, FT_Short ) )
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goto Exit;
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adjust = 1;
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loader->max_contours = new_max;
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}
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if ( adjust )
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FT_GlyphLoader_Adjust_Points( loader );
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Exit:
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return error;
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}
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/* Ensure that we can add `n_subglyphs' to our glyph. this function */
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/* reallocates its subglyphs table if necessary. Note that it DOES */
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/* NOT change the number of subglyphs within the loader! */
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/* */
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FT_BASE_DEF( FT_Error )
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FT_GlyphLoader_Check_Subglyphs( FT_GlyphLoader loader,
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FT_UInt n_subs )
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{
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FT_Memory memory = loader->memory;
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FT_Error error = FT_Err_Ok;
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FT_UInt new_max, old_max;
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FT_GlyphLoad* base = &loader->base;
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FT_GlyphLoad* current = &loader->current;
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new_max = base->num_subglyphs + current->num_subglyphs + n_subs;
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old_max = loader->max_subglyphs;
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if ( new_max > old_max )
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{
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new_max = ( new_max + 1 ) & -2;
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if ( REALLOC_ARRAY( base->subglyphs, old_max, new_max, FT_SubGlyph ) )
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goto Exit;
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loader->max_subglyphs = new_max;
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FT_GlyphLoader_Adjust_Subglyphs( loader );
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}
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Exit:
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return error;
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}
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/* prepare loader for the addition of a new glyph on top of the base one */
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FT_BASE_DEF( void )
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FT_GlyphLoader_Prepare( FT_GlyphLoader loader )
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{
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FT_GlyphLoad* current = &loader->current;
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current->outline.n_points = 0;
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current->outline.n_contours = 0;
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current->num_subglyphs = 0;
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FT_GlyphLoader_Adjust_Points ( loader );
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FT_GlyphLoader_Adjust_Subglyphs( loader );
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}
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/* add current glyph to the base image - and prepare for another */
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FT_BASE_DEF( void )
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FT_GlyphLoader_Add( FT_GlyphLoader loader )
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{
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FT_GlyphLoad* base = &loader->base;
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FT_GlyphLoad* current = &loader->current;
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FT_UInt n_curr_contours = current->outline.n_contours;
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FT_UInt n_base_points = base->outline.n_points;
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FT_UInt n;
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base->outline.n_points =
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(short)( base->outline.n_points + current->outline.n_points );
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base->outline.n_contours =
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(short)( base->outline.n_contours + current->outline.n_contours );
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base->num_subglyphs += current->num_subglyphs;
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/* adjust contours count in newest outline */
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for ( n = 0; n < n_curr_contours; n++ )
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current->outline.contours[n] =
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(short)( current->outline.contours[n] + n_base_points );
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/* prepare for another new glyph image */
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FT_GlyphLoader_Prepare( loader );
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}
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FT_BASE_DEF( FT_Error )
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FT_GlyphLoader_Copy_Points( FT_GlyphLoader target,
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FT_GlyphLoader source )
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{
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FT_Error error;
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FT_UInt num_points = source->base.outline.n_points;
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FT_UInt num_contours = source->base.outline.n_contours;
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error = FT_GlyphLoader_Check_Points( target, num_points, num_contours );
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if ( !error )
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{
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FT_Outline* out = &target->base.outline;
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FT_Outline* in = &source->base.outline;
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MEM_Copy( out->points, in->points,
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num_points * sizeof ( FT_Vector ) );
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MEM_Copy( out->tags, in->tags,
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num_points * sizeof ( char ) );
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MEM_Copy( out->contours, in->contours,
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num_contours * sizeof ( short ) );
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/* do we need to copy the extra points? */
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if ( target->use_extra && source->use_extra )
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MEM_Copy( target->base.extra_points, source->base.extra_points,
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num_points * sizeof ( FT_Vector ) );
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out->n_points = (short)num_points;
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out->n_contours = (short)num_contours;
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FT_GlyphLoader_Adjust_Points( target );
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}
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return error;
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}
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/* END */
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