1 /* Copyright  (C) 2010-2018 The RetroArch team
2  *
3  * ---------------------------------------------------------------------------------------
4  * The following license statement only applies to this file (scaler.h).
5  * ---------------------------------------------------------------------------------------
6  *
7  * Permission is hereby granted, free of charge,
8  * to any person obtaining a copy of this software and associated documentation files (the "Software"),
9  * to deal in the Software without restriction, including without limitation the rights to
10  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
11  * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
16  * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
19  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21  */
22 
23 #ifndef __LIBRETRO_SDK_SCALER_H__
24 #define __LIBRETRO_SDK_SCALER_H__
25 
26 #include <stdint.h>
27 #include <stddef.h>
28 #include <boolean.h>
29 #include <clamping.h>
30 
31 #include <retro_common_api.h>
32 
33 RETRO_BEGIN_DECLS
34 
35 enum scaler_pix_fmt
36 {
37    SCALER_FMT_ARGB8888 = 0,
38    SCALER_FMT_ABGR8888,
39    SCALER_FMT_0RGB1555,
40    SCALER_FMT_RGB565,
41    SCALER_FMT_BGR24,
42    SCALER_FMT_YUYV,
43    SCALER_FMT_RGBA4444
44 };
45 
46 enum scaler_type
47 {
48    SCALER_TYPE_UNKNOWN = 0,
49    SCALER_TYPE_POINT,
50    SCALER_TYPE_BILINEAR,
51    SCALER_TYPE_SINC
52 };
53 
54 struct scaler_filter
55 {
56    int16_t *filter;
57    int filter_len;
58    int filter_stride;
59    int *filter_pos;
60 };
61 
62 struct scaler_ctx
63 {
64    int in_width;
65    int in_height;
66    int in_stride;
67 
68    int out_width;
69    int out_height;
70    int out_stride;
71 
72    enum scaler_pix_fmt in_fmt;
73    enum scaler_pix_fmt out_fmt;
74    enum scaler_type scaler_type;
75 
76    void (*scaler_horiz)(const struct scaler_ctx*,
77          const void*, int);
78    void (*scaler_vert)(const struct scaler_ctx*,
79          void*, int);
80    void (*scaler_special)(const struct scaler_ctx*,
81          void*, const void*, int, int, int, int, int, int);
82 
83    void (*in_pixconv)(void*, const void*, int, int, int, int);
84    void (*out_pixconv)(void*, const void*, int, int, int, int);
85    void (*direct_pixconv)(void*, const void*, int, int, int, int);
86 
87    bool unscaled;
88    struct scaler_filter horiz, vert;
89 
90    struct
91    {
92       uint32_t *frame;
93       int stride;
94    } input;
95 
96    struct
97    {
98       uint64_t *frame;
99       int width;
100       int height;
101       int stride;
102    } scaled;
103 
104    struct
105    {
106       uint32_t *frame;
107       int stride;
108    } output;
109 };
110 
111 bool scaler_ctx_gen_filter(struct scaler_ctx *ctx);
112 
113 void scaler_ctx_gen_reset(struct scaler_ctx *ctx);
114 
115 /**
116  * scaler_ctx_scale:
117  * @ctx          : pointer to scaler context object.
118  * @output       : pointer to output image.
119  * @input        : pointer to input image.
120  *
121  * Scales an input image to an output image.
122  **/
123 void scaler_ctx_scale(struct scaler_ctx *ctx,
124       void *output, const void *input);
125 
126 RETRO_END_DECLS
127 
128 #endif
129