365 lines
10 KiB
C
365 lines
10 KiB
C
/****************************************************************************
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*
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* ftgloadr.c
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*
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* The FreeType glyph loader (body).
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*
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* Copyright (C) 2002-2019 by
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* David Turner, Robert Wilhelm, and Werner Lemberg
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_GLYPH_LOADER_H
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#include FT_INTERNAL_MEMORY_H
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#include FT_INTERNAL_OBJECTS_H
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#undef FT_COMPONENT
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#define FT_COMPONENT 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 = NULL;
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FT_Error error;
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if ( !FT_NEW( 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 glyph loader, free all allocated tables, */
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/* and start 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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FT_FREE( loader->base.outline.points );
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FT_FREE( loader->base.outline.tags );
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FT_FREE( loader->base.outline.contours );
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FT_FREE( loader->base.extra_points );
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FT_FREE( loader->base.subglyphs );
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loader->base.extra_points2 = NULL;
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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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FT_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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{
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loader->current.extra_points = loader->base.extra_points +
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base->n_points;
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loader->current.extra_points2 = loader->base.extra_points2 +
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base->n_points;
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}
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}
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FT_BASE_DEF( FT_Error )
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FT_GlyphLoader_CreateExtra( 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 ( !FT_NEW_ARRAY( loader->base.extra_points, 2 * loader->max_points ) )
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{
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loader->use_extra = 1;
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loader->base.extra_points2 = loader->base.extra_points +
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loader->max_points;
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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. */
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/* This function reallocates its outline tables if necessary. Note that */
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/* it 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_CheckPoints( 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 = 0;
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FT_UInt new_max, old_max;
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/* check points & tags */
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new_max = (FT_UInt)base->n_points + (FT_UInt)current->n_points +
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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 = FT_PAD_CEIL( new_max, 8 );
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if ( new_max > FT_OUTLINE_POINTS_MAX )
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return FT_THROW( Array_Too_Large );
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if ( FT_RENEW_ARRAY( base->points, old_max, new_max ) ||
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FT_RENEW_ARRAY( base->tags, old_max, new_max ) )
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goto Exit;
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if ( loader->use_extra )
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{
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if ( FT_RENEW_ARRAY( loader->base.extra_points,
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old_max * 2, new_max * 2 ) )
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goto Exit;
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FT_ARRAY_MOVE( loader->base.extra_points + new_max,
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loader->base.extra_points + old_max,
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old_max );
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loader->base.extra_points2 = loader->base.extra_points + new_max;
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}
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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 = (FT_UInt)base->n_contours + (FT_UInt)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 = FT_PAD_CEIL( new_max, 4 );
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if ( new_max > FT_OUTLINE_CONTOURS_MAX )
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return FT_THROW( Array_Too_Large );
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if ( FT_RENEW_ARRAY( base->contours, old_max, new_max ) )
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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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if ( error )
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FT_GlyphLoader_Reset( loader );
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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_CheckSubGlyphs( 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 = FT_PAD_CEIL( new_max, 2 );
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if ( FT_RENEW_ARRAY( base->subglyphs, old_max, new_max ) )
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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;
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FT_GlyphLoad current;
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FT_Int n_curr_contours;
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FT_Int n_base_points;
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FT_Int n;
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if ( !loader )
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return;
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base = &loader->base;
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current = &loader->current;
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n_curr_contours = current->outline.n_contours;
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n_base_points = base->outline.n_points;
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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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/* END */
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