1 /* GStreamer
2  * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  */
19 
20 #ifndef __GST_VIDEO_SCALE_H__
21 #define __GST_VIDEO_SCALE_H__
22 
23 #include <gst/gst.h>
24 #include <gst/video/video.h>
25 #include <gst/video/gstvideofilter.h>
26 
27 G_BEGIN_DECLS
28 
29 #define GST_TYPE_VIDEO_SCALE \
30   (gst_video_scale_get_type())
31 #define GST_VIDEO_SCALE(obj) \
32   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_SCALE,GstVideoScale))
33 #define GST_VIDEO_SCALE_CLASS(klass) \
34   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_SCALE,GstVideoScaleClass))
35 #define GST_IS_VIDEO_SCALE(obj) \
36   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_SCALE))
37 #define GST_IS_VIDEO_SCALE_CLASS(klass) \
38   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_SCALE))
39 #define GST_VIDEO_SCALE_CAST(obj)       ((GstVideoScale *)(obj))
40 
41 
42 /**
43  * GstVideoScaleMethod:
44  * @GST_VIDEO_SCALE_NEAREST: use nearest neighbour scaling (fast and ugly)
45  * @GST_VIDEO_SCALE_BILINEAR: use 2-tap bilinear scaling (slower but prettier).
46  * @GST_VIDEO_SCALE_4TAP: use a 4-tap sinc filter for scaling (slow).
47  * @GST_VIDEO_SCALE_LANCZOS: use a multitap Lanczos filter for scaling (slow).
48  * @GST_VIDEO_SCALE_BILINEAR2: use a multitap bilinear filter
49  * @GST_VIDEO_SCALE_SINC: use a multitap sinc filter
50  * @GST_VIDEO_SCALE_HERMITE: use a multitap bicubic Hermite filter
51  * @GST_VIDEO_SCALE_SPLINE: use a multitap bicubic spline filter
52  * @GST_VIDEO_SCALE_CATROM: use a multitap bicubic Catmull-Rom filter
53  * @GST_VIDEO_SCALE_MITCHELL: use a multitap bicubic Mitchell filter
54  *
55  * The videoscale method to use.
56  */
57 typedef enum {
58   GST_VIDEO_SCALE_NEAREST,
59   GST_VIDEO_SCALE_BILINEAR,
60   GST_VIDEO_SCALE_4TAP,
61   GST_VIDEO_SCALE_LANCZOS,
62 
63   GST_VIDEO_SCALE_BILINEAR2,
64   GST_VIDEO_SCALE_SINC,
65   GST_VIDEO_SCALE_HERMITE,
66   GST_VIDEO_SCALE_SPLINE,
67   GST_VIDEO_SCALE_CATROM,
68   GST_VIDEO_SCALE_MITCHELL
69 } GstVideoScaleMethod;
70 
71 typedef struct _GstVideoScale GstVideoScale;
72 typedef struct _GstVideoScaleClass GstVideoScaleClass;
73 
74 /**
75  * GstVideoScale:
76  *
77  * Opaque data structure
78  */
79 struct _GstVideoScale {
80   GstVideoFilter element;
81 
82   /* properties */
83   GstVideoScaleMethod method;
84   gboolean add_borders;
85   double sharpness;
86   double sharpen;
87   gboolean dither;
88   int submethod;
89   double envelope;
90   gboolean gamma_decode;
91   gint n_threads;
92 
93   GstVideoConverter *convert;
94 
95   gint borders_h;
96   gint borders_w;
97 };
98 
99 struct _GstVideoScaleClass {
100   GstVideoFilterClass parent_class;
101 };
102 
103 G_GNUC_INTERNAL GType gst_video_scale_get_type (void);
104 
105 G_END_DECLS
106 
107 #endif /* __GST_VIDEO_SCALE_H__ */
108