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#ifndef FTSDFREND_H_
#define FTSDFREND_H_
#include <freetype/ftrender.h>
#include <freetype/ftmodapi.h>
#include <freetype/internal/ftobjs.h>
FT_BEGIN_HEADER
/**************************************************************************
*
* @struct:
* SDF_Renderer_Module
*
* @description:
* This struct extends the native renderer struct `FT_RendererRec'.
* It is basically used to store various parameters required by the
* renderer and some additional parameters which can be used to
* tweak the output of the renderer.
*
* @fields:
* root ::
* The native rendere struct.
*
* spread ::
* This is and essential parameter/property required by the
* rendere. `spread' defines the maximum unsigned value that
* will be present in the final SDF output. For default value
* check `ftsdfcommon.h'.
*
* flip_sign ::
* By default the position values are inside the contours i.e.
* filled by a contour. If this property is true then that output
* will be opposite from the default i.e. negative will be filled
* by a contour.
*
* flip_y ::
* Setting this parameter to true maked the output image flipped
* along the y-axis.
*
* overlaps ::
* Set this to true to generate SDF for glyphs having overlapping
* contours. The overlapping support is limited to glyph which do
* not have self intersecting contours. Also, removing overlaps
* require a considerable amount of extra memory and this is not
* valid while generating SDF from bitmap.
*
* @note:
* All properties except `overlaps' is valid for both `sdf' and
* `bsdf' renderer.
*
*/
typedef struct SDF_Renderer_Module_
{
FT_RendererRec root;
FT_UInt spread;
FT_Bool flip_sign;
FT_Bool flip_y;
FT_Bool overlaps;
} SDF_Renderer_Module, *SDF_Renderer;
/**************************************************************************
*
* @renderer:
* ft_sdf_renderer_class
*
* @description:
* Renderer to convert `FT_Outline' to signed distance fields.
*
*/
FT_DECLARE_RENDERER( ft_sdf_renderer_class )
/**************************************************************************
*
* @renderer:
* ft_bitmap_sdf_renderer_class
*
* @description:
* This is not exactly a renderer, it's just a converter which
* convert bitmaps to signed distance fields.
*
* @note:
* This is not a separate module, it is a part of the `sdf' module.
*
*/
FT_DECLARE_RENDERER( ft_bitmap_sdf_renderer_class )
FT_END_HEADER
#endif /* FTSDFREND_H_ */
/* END */
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