ref: d0ab3a0dd8f6355b3603d0fb04043a9ae867639b
dir: /libfreetype/ftgloadr.c/
/***************************************************************************/ /* */ /* ftgloadr.c */ /* */ /* The FreeType glyph loader (body). */ /* */ /* Copyright 2002 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <ft2build.h> #include FT_INTERNAL_GLYPH_LOADER_H #include FT_INTERNAL_MEMORY_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 ( !FT_NEW( 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; FT_FREE( loader->base.outline.points ); FT_FREE( loader->base.outline.tags ); FT_FREE( loader->base.outline.contours ); FT_FREE( loader->base.extra_points ); FT_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 ); FT_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_CreateExtra( FT_GlyphLoader loader ) { FT_Error error; FT_Memory memory = loader->memory; if ( !FT_NEW_ARRAY( loader->base.extra_points, loader->max_points ) ) { 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_CheckPoints( 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 ( FT_RENEW_ARRAY( base->points, old_max, new_max ) || FT_RENEW_ARRAY( base->tags, old_max, new_max ) ) goto Exit; if ( loader->use_extra && FT_RENEW_ARRAY( loader->base.extra_points, old_max, new_max ) ) 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 ( FT_RENEW_ARRAY( base->contours, old_max, new_max ) ) 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_CheckSubGlyphs( 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 ( FT_RENEW_ARRAY( base->subglyphs, old_max, new_max ) ) 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_CopyPoints( 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_CheckPoints( target, num_points, num_contours ); if ( !error ) { FT_Outline* out = &target->base.outline; FT_Outline* in = &source->base.outline; FT_MEM_COPY( out->points, in->points, num_points * sizeof ( FT_Vector ) ); FT_MEM_COPY( out->tags, in->tags, num_points * sizeof ( char ) ); FT_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 ) FT_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 */