[sdf] Add interface functions for the 'bsdf' rasterizer.
* src/sdf/ftsdf.c (bsdf_raster_new, bsdf_raster_reset, bsdf_raster_set_mode, bsdf_raster_render, bsdf_raster_done): New functions. (ft_bitmap_sdf_raster): New variable. * src/sdf/ftsdf.h: Updated.
This commit is contained in:
Anuj Verma
Werner Lemberg
parent
a21134751c
commit
d27d107f15
16
ChangeLog
16
ChangeLog
@ -1,3 +1,15 @@
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2020-08-20 Anuj Verma <anujv@iitbhilai.ac.in>
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[sdf] Add interface functions for the 'bsdf' rasterizer.
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* src/sdf/ftsdf.c (bsdf_raster_new, bsdf_raster_reset,
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bsdf_raster_set_mode, bsdf_raster_render, bsdf_raster_done): New
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functions.
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(ft_bitmap_sdf_raster): New variable.
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* src/sdf/ftsdf.h: Updated.
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2020-08-20 Anuj Verma <anujv@iitbhilai.ac.in>
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[sdf] Add function to copy SDF data into output bitmap.
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@ -42,7 +54,7 @@
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[sdf] Add 'sdf' module to non-gnumake build systems.
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* include/freetype/config/ftmodule.h: Add both the 'sfd' and 'bsfd'
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* include/freetype/config/ftmodule.h: Add both the 'sdf' and 'bsdf'
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renderers to the list of modules.
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* CMakeLists.txt (BASE_SRCS): Add 'sdf' single-object module.
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@ -58,7 +70,7 @@
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[sdf] Add build infrastructure.
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* src/sdf/module.mk, src/sfd/rules.mk: New files.
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* src/sdf/module.mk, src/sdf/rules.mk: New files.
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* src/sdf/ftsdf.h (ft_sdf_raster): New forward declaration.
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181
src/sdf/ftbsdf.c
181
src/sdf/ftbsdf.c
@ -1043,4 +1043,185 @@
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return error;
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}
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/**************************************************************************
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*
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* interface functions
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*
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*/
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/* called when adding a new module through @FT_Add_Module */
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static FT_Error
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bsdf_raster_new( FT_Memory memory,
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FT_Raster* araster )
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{
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FT_Error error = FT_Err_Ok;
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BSDF_TRaster* raster = NULL;
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*araster = 0;
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if ( !FT_ALLOC( raster, sizeof ( BSDF_TRaster ) ) )
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{
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raster->memory = memory;
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*araster = (FT_Raster)raster;
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}
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return error;
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}
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/* unused */
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static void
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bsdf_raster_reset( FT_Raster raster,
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unsigned char* pool_base,
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unsigned long pool_size )
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{
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FT_UNUSED( raster );
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FT_UNUSED( pool_base );
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FT_UNUSED( pool_size );
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}
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/* unused */
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static FT_Error
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bsdf_raster_set_mode( FT_Raster raster,
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unsigned long mode,
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void* args )
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{
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FT_UNUSED( raster );
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FT_UNUSED( mode );
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FT_UNUSED( args );
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return FT_Err_Ok;
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}
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/* called while rendering through @FT_Render_Glyph */
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static FT_Error
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bsdf_raster_render( FT_Raster raster,
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const FT_Raster_Params* params )
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{
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FT_Error error = FT_Err_Ok;
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FT_Memory memory = NULL;
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const FT_Bitmap* source = NULL;
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const FT_Bitmap* target = NULL;
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BSDF_TRaster* bsdf_raster = (BSDF_TRaster*)raster;
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BSDF_Worker worker;
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const SDF_Raster_Params* sdf_params = (const SDF_Raster_Params*)params;
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worker.distance_map = NULL;
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/* check for valid parameters */
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if ( !raster || !params )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* check whether the flag is set */
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if ( sdf_params->root.flags != FT_RASTER_FLAG_SDF )
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{
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error = FT_THROW( Raster_Corrupted );
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goto Exit;
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}
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source = sdf_params->root.source;
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target = sdf_params->root.target;
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/* check source and target bitmap */
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if ( !source || !target )
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{
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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memory = bsdf_raster->memory;
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if ( !memory )
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{
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FT_TRACE0(( "bsdf_raster_render: Raster not set up properly,\n" ));
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FT_TRACE0(( " unable to find memory handle.\n" ));
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error = FT_THROW( Invalid_Handle );
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goto Exit;
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}
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/* check whether spread is set properly */
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if ( sdf_params->spread > MAX_SPREAD ||
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sdf_params->spread < MIN_SPREAD )
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{
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FT_TRACE0(( "bsdf_raster_render:"
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" The `spread' field of `SDF_Raster_Params'\n" ));
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FT_TRACE0(( " "
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" is invalid; the value of this field must be\n" ));
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FT_TRACE0(( " "
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" within [%d, %d].\n",
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MIN_SPREAD, MAX_SPREAD ));
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FT_TRACE0(( " "
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" Also, you must pass `SDF_Raster_Params'\n" ));
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FT_TRACE0(( " "
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" instead of the default `FT_Raster_Params'\n" ));
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FT_TRACE0(( " "
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" while calling this function and set the fields\n" ));
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FT_TRACE0(( " "
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" accordingly.\n" ));
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error = FT_THROW( Invalid_Argument );
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goto Exit;
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}
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/* set up the worker */
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/* allocate the distance map */
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if ( FT_QALLOC_MULT( worker.distance_map, target->rows,
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target->width * sizeof ( *worker.distance_map ) ) )
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goto Exit;
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worker.width = target->width;
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worker.rows = target->rows;
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worker.params = *sdf_params;
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FT_CALL( bsdf_init_distance_map( source, &worker ) );
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FT_CALL( bsdf_approximate_edge( &worker ) );
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FT_CALL( edt8( &worker ) );
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FT_CALL( finalize_sdf( &worker, target ) );
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FT_TRACE0(( "bsdf_raster_render: Total memory used = %ld\n",
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worker.width * worker.rows *
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sizeof ( *worker.distance_map ) ));
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Exit:
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if ( worker.distance_map )
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FT_FREE( worker.distance_map );
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return error;
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}
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/* called while deleting `FT_Library` only if the module is added */
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static void
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bsdf_raster_done( FT_Raster raster )
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{
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FT_Memory memory = (FT_Memory)((BSDF_TRaster*)raster)->memory;
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FT_FREE( raster );
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}
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FT_DEFINE_RASTER_FUNCS(
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ft_bitmap_sdf_raster,
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FT_GLYPH_FORMAT_BITMAP,
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(FT_Raster_New_Func) bsdf_raster_new, /* raster_new */
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(FT_Raster_Reset_Func) bsdf_raster_reset, /* raster_reset */
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(FT_Raster_Set_Mode_Func)bsdf_raster_set_mode, /* raster_set_mode */
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(FT_Raster_Render_Func) bsdf_raster_render, /* raster_render */
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(FT_Raster_Done_Func) bsdf_raster_done /* raster_done */
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)
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/* END */
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@ -67,6 +67,9 @@ FT_BEGIN_HEADER
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/* rasterizer to convert outline to SDF */
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FT_EXPORT_VAR( const FT_Raster_Funcs ) ft_sdf_raster;
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/* rasterizer to convert bitmap to SDF */
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FT_EXPORT_VAR( const FT_Raster_Funcs ) ft_bitmap_sdf_raster;
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FT_END_HEADER
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#endif /* FTSDF_H_ */
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