forked from minhngoc25a/freetype2
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
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#ifndef FTSDFREND_H_
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#define FTSDFREND_H_
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#include <freetype/ftrender.h>
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#include <freetype/ftmodapi.h>
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#include <freetype/internal/ftobjs.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_Renderer_Module
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*
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* @description:
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* This struct extends the native renderer struct `FT_RendererRec'.
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* It is basically used to store various parameters required by the
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* renderer and some additional parameters which can be used to
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* tweak the output of the renderer.
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*
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* @fields:
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* root ::
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* The native rendere 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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* All properties except `overlaps' is valid for both `sdf' and
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* `bsdf' renderer.
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*
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*/
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typedef struct SDF_Renderer_Module_
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{
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FT_RendererRec 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_Renderer_Module, *SDF_Renderer;
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/**************************************************************************
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*
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* @renderer:
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* ft_sdf_renderer_class
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*
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* @description:
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* Renderer to convert `FT_Outline' to signed distance fields.
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*
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*/
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FT_DECLARE_RENDERER( ft_sdf_renderer_class )
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/**************************************************************************
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*
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* @renderer:
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* ft_bitmap_sdf_renderer_class
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*
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* @description:
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* This is not exactly a renderer, it's just a converter which
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* convert bitmaps to signed distance fields.
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*
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* @note:
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* This is not a separate module, it is a part of the `sdf' module.
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*
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*/
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FT_DECLARE_RENDERER( ft_bitmap_sdf_renderer_class )
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FT_END_HEADER
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#endif /* FTSDFREND_H_ */
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/* END */
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