bdc2df62ae
Pixel color components can be scaled using either bilinear interpolation or a multitap filter. The multitap filter provides better results, but can't be selected when the alpha layer need to be scaled down by more than 1/2. Disable alpha scaling when the input has a fixed alpha value, and program the UDS to output a fixed alpha value in that case. This ensures the multitap filter will be used whenever possible. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
40 lines
1 KiB
C
40 lines
1 KiB
C
/*
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* vsp1_uds.h -- R-Car VSP1 Up and Down Scaler
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*
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* Copyright (C) 2013-2014 Renesas Electronics Corporation
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*
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* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef __VSP1_UDS_H__
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#define __VSP1_UDS_H__
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#include <media/media-entity.h>
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#include <media/v4l2-subdev.h>
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#include "vsp1_entity.h"
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struct vsp1_device;
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#define UDS_PAD_SINK 0
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#define UDS_PAD_SOURCE 1
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struct vsp1_uds {
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struct vsp1_entity entity;
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bool scale_alpha;
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};
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static inline struct vsp1_uds *to_uds(struct v4l2_subdev *subdev)
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{
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return container_of(subdev, struct vsp1_uds, entity.subdev);
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}
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struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index);
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void vsp1_uds_set_alpha(struct vsp1_uds *uds, unsigned int alpha);
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#endif /* __VSP1_UDS_H__ */
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