Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/****************************************************************************
* graphics/nxglib/nxglib_filltrapezoid.c
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <fixedmath.h>
#include <nuttx/fb.h>
#include <nuttx/nxglib.h>
#include "nxglib_bitblit.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
#ifndef NXGLIB_SUFFIX
# error "NXGLIB_SUFFIX must be defined before including this header file"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxglib_filltrapezoid_*bpp
*
* Descripton:
* Fill a trapezoidal region in the framebuffer memory with a fixed color.
* This is useful for drawing complex shape -- (most) complex shapes can be
* broken into a set of trapezoids.
*
****************************************************************************/
void NXGL_FUNCNAME(nxglib_filltrapezoid,NXGLIB_SUFFIX)
(FAR struct fb_videoinfo_s *vinfo, FAR struct fb_planeinfo_s *pinfo,
FAR const struct nxgl_trapezoid_s *trap, NXGL_PIXEL_T color)
{
unsigned int stride;
ubyte *line;
int nrows;
b16_t x1;
b16_t x2;
b16_t dx1dy;
b16_t dx2dy;
/* Get the width of the framebuffer in bytes */
stride = pinfo->stride;
/* Get the top run position and the number of rows to draw */
x1 = trap->top.x1;
x2 = trap->top.x2;
nrows = trap->bot.y - trap->top.y + 1;
/* Get the address of the first byte on the first line */
line = pinfo->fbmem + trap->top.y * stride ;
/* Calculate the slope of the left and right side of the trapezoid */
dx1dy = b16divi((trap->bot.x1 - x1), nrows);
dx2dy = b16divi((trap->bot.x2 - x2), nrows);
/* Then fill the trapezoid line-by-line */
while (nrows--)
{
int ix1;
int ix2;
/* Handle the special case where the sides cross (as in an hourglass) */
if (x1 > x2)
{
b16_t tmp;
ngl_swap(x1, x2, tmp);
ngl_swap(dx1dy, dx2dy, tmp);
}
/* Convert the positions to integer */
ix1 = b16toi(x1);
ix2 = b16toi(x2);
/* Handle some corner cases where we draw nothing. Otherwise, we will
* always draw at least one pixel.
*/
if (x1 > x2 || ix2 < 0 || ix1 > vinfo->yres)
{
/* Get a clipped copies of the startingand ending X positions. This
* clipped truncates "down" and gives the quantized pixel holding the
* fractional X position
*/
ix1 = ngl_clipl(ix1, 0);
ix2 = ngl_clipr(ix2, vinfo->yres);
/* Then draw the run from (line + clipx1) to (line + clipx2) */
NXGL_MEMSET(line + NXGL_SCALEX(ix1), color, ix2 - ix1 + 1);
}
/* Move to the start of the next line */
line += stride;
/* Add the dx/dy value to get the run positions on the next row */
x1 += dx1dy;
x2 += dx2dy;
}
}