forked from minhngoc25a/freetype2
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
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#ifndef FTSDF_H_
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#define FTSDF_H_
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#include <ft2build.h>
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#include FT_CONFIG_CONFIG_H
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#include <freetype/ftimage.h>
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/* common properties and function */
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#include "ftsdfcommon.h"
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* @struct:
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* SDF_Raster_Params
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*
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* @description:
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* This struct must be passed to the raster render function
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* `FT_Raster_Render_Func' instead of `FT_Raster_Params' because
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* the rasterizer require some addition information to render properly.
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* So, this struct is used to pass additional parameter to the
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* rasterizer.
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*
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* @fields:
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* root ::
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* The native raster params struct.
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*
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* spread ::
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* This is and essential parameter/property required by the
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* rendere. `spread' defines the maximum unsigned value that
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* will be present in the final SDF output. For default value
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* check `ftsdfcommon.h'.
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*
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* flip_sign ::
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* By default the position values are inside the contours i.e.
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* filled by a contour. If this property is true then that output
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* will be opposite from the default i.e. negative will be filled
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* by a contour.
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*
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* flip_y ::
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* Setting this parameter to true maked the output image flipped
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* along the y-axis.
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*
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* overlaps ::
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* Set this to true to generate SDF for glyphs having overlapping
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* contours. The overlapping support is limited to glyph which do
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* not have self intersecting contours. Also, removing overlaps
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* require a considerable amount of extra memory and this is not
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* valid while generating SDF from bitmap.
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*
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* @note:
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* It is valid for both `sdf' and `bsdf' renderer.
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*
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*/
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typedef struct SDF_Raster_Params_
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{
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FT_Raster_Params root;
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FT_UInt spread;
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FT_Bool flip_sign;
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FT_Bool flip_y;
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FT_Bool overlaps;
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} SDF_Raster_Params;
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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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/* END */
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