1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2006-2008 H. Peter Anvin - All Rights Reserved
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom
11 * the Software is furnished to do so, subject to the following
12 * conditions:
13 *
14 * The above copyright notice and this permission notice shall
15 * be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * ----------------------------------------------------------------------- */
27
28 /*
29 * fmtpixel.c
30 *
31 * Functions to format a single pixel
32 */
33
34 #include <inttypes.h>
35 #include "video.h"
36
37 /*
38 * Format a sequence of pixels. The first argument is the line buffer;
39 * we can use it to write up to 4 bytes past the end of the last pixel.
40 * Return the place we should be copying from, this is usually the
41 * buffer address, but doesn't *have* to be.
42 */
43
format_pxf_bgra32(void * ptr,const uint32_t * p,size_t n)44 static const void *format_pxf_bgra32(void *ptr, const uint32_t * p, size_t n)
45 {
46 (void)ptr;
47 (void)n;
48 return p; /* No conversion needed! */
49 }
50
format_pxf_bgr24(void * ptr,const uint32_t * p,size_t n)51 static const void *format_pxf_bgr24(void *ptr, const uint32_t * p, size_t n)
52 {
53 char *q = ptr;
54
55 while (n--) {
56 *(uint32_t *) q = *p++;
57 q += 3;
58 }
59 return ptr;
60 }
61
format_pxf_le_rgb16_565(void * ptr,const uint32_t * p,size_t n)62 static const void *format_pxf_le_rgb16_565(void *ptr, const uint32_t * p,
63 size_t n)
64 {
65 uint32_t bgra;
66 uint16_t *q = ptr;
67
68 while (n--) {
69 bgra = *p++;
70 *q++ =
71 ((bgra >> 3) & 0x1f) +
72 ((bgra >> (2 + 8 - 5)) & (0x3f << 5)) +
73 ((bgra >> (3 + 16 - 11)) & (0x1f << 11));
74 }
75 return ptr;
76 }
77
format_pxf_le_rgb15_555(void * ptr,const uint32_t * p,size_t n)78 static const void *format_pxf_le_rgb15_555(void *ptr, const uint32_t * p,
79 size_t n)
80 {
81 uint32_t bgra;
82 uint16_t *q = ptr;
83
84 while (n--) {
85 bgra = *p++;
86 *q++ =
87 ((bgra >> 3) & 0x1f) +
88 ((bgra >> (2 + 8 - 5)) & (0x1f << 5)) +
89 ((bgra >> (3 + 16 - 10)) & (0x1f << 10));
90 }
91 return ptr;
92 }
93
94 __vesacon_format_pixels_t __vesacon_format_pixels;
95
96 const __vesacon_format_pixels_t __vesacon_format_pixels_list[PXF_NONE] = {
97 [PXF_BGRA32] = format_pxf_bgra32,
98 [PXF_BGR24] = format_pxf_bgr24,
99 [PXF_LE_RGB16_565] = format_pxf_le_rgb16_565,
100 [PXF_LE_RGB15_555] = format_pxf_le_rgb15_555,
101 };
102