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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* Pure Data Packet system file. - image resampling routines
* Copyright (c) by Tom Schouten <tom@zwizwa.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <string.h>
#include "pdp_resample.h"
/*
efficient bilinear resampling ??
performance: how to eliminate divides? -> virtual coordinates 2^k x 2^k (conf. opengl)
i.e. 16 bit virtual coordinates: easy modular addressing
*/
/* code in this file should go out to be replaced by code in pdp_imageproc */
static s32 pdp_resample_bilin(s16 *image, s32 width, s32 height, s32 virt_x, s32 virt_y)
{
s32 fp_x, fp_y, frac_x, frac_y, f, offset, r_1, r_2;
virt_x &= 0xffff;
virt_y &= 0xffff;
fp_x = virt_x * (width - 1);
fp_y = virt_y * (height - 1);
frac_x = fp_x & (0xffff);
frac_y = fp_y & (0xffff);
offset = (fp_x >> 16) + (fp_y >> 16) * width;
image += offset;
f = 0x10000 - frac_x;
r_1 = ((f * (s32)(image[0]) + frac_x * (s32)(image[1])))>>16;
image += width;
r_2 = ((f * (s32)(image[0]) + frac_x * (s32)(image[1])))>>16;
f = 0x10000 - frac_y;
return ((f * r_1 + frac_y * r_2)>>16);
}
void pdp_resample_scale_bilin(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h)
{
s32 i,j;
s32 virt_x=0;
s32 virt_y=0; /* virtual coordinates in 30 bit */
s32 scale_x = 0x40000000 / dst_w;
s32 scale_y = 0x40000000 / dst_h;
for (j=0; j<dst_h; j++){
for (i=0; i<dst_w; i++){
*dst_image++ = pdp_resample_bilin(src_image, src_w, src_h, virt_x>>14, virt_y>>14);
virt_x += scale_x;
}
virt_x = 0;
virt_y += scale_y;
}
}
void pdp_resample_scale_nn(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h)
{
s32 i,j;
s32 x=0;
s32 y=0;
s32 frac_x=0;
s32 frac_y=0;
s32 scale_x = (src_w << 20 ) / dst_w;
s32 scale_y = (src_h << 20 ) / dst_h;
for (j=0; j<dst_h; j++){
for (i=0; i<dst_w; i++){
*dst_image++ = src_image[x+y];
frac_x += scale_x;
x = frac_x >> 20;
}
x = 0;
frac_x = 0;
frac_y += scale_y;
y = (frac_y >> 20) * src_w;
}
}
/* USE pdp_resample_affinemap
void pdp_resample_zoom_tiled_bilin(s16 *src_image, s16 *dst_image, s32 w, s32 h,
float zoom_x, float zoom_y, float center_x_relative, float center_y_relative)
{
float izx = 1.0f / zoom_x;
float izy = 1.0f / zoom_y;
s32 scale_x = (s32)((float)0x100000 * izx / (float)w);
s32 scale_y = (s32)((float)0x100000 * izy / (float)h);
s32 top_virt_x = (s32)((1.0f - izx) * (float)0x100000 * center_x_relative);
s32 top_virt_y = (s32)((1.0f - izy) * (float)0x100000 * center_y_relative);
s32 virt_x = top_virt_x;
s32 virt_y = top_virt_y;
s32 i,j;
for (j=0; j<h; j++){
for (i=0; i<w; i++){
*dst_image++ = pdp_resample_bilin(src_image, w, h, virt_x>>4, virt_y>>4);
virt_x += scale_x;
}
virt_x = top_virt_x;
virt_y += scale_y;
}
}
*/
void pdp_resample_halve(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h)
{
int dst_x,dst_y;
int src_x = 0;
int src_y = 0;
int dst_w = src_w >> 1;
int dst_h = src_h >> 1;
s32 tmp1,tmp2,tmp3,tmp4;
//post("%x %x %d %d\n", src_image, dst_image, src_w, src_h);
for(dst_y = 0; dst_y < dst_h * dst_w; dst_y += dst_w){
for (dst_x = 0; dst_x < dst_w; dst_x++){
tmp1 = (s32)src_image[src_y + src_x];
tmp2 = (s32)src_image[src_y + src_x + 1];
tmp3 = (s32)src_image[src_y + src_x + src_w];
tmp4 = (s32)src_image[src_y + src_x + src_w + 1];
tmp1 += tmp2;
tmp3 += tmp4;
src_x += 2;
dst_image[dst_x+dst_y] = (s16)((tmp1 + tmp3)>>2);
}
src_y += src_w << 1;
src_x = 0;
}
}
void pdp_resample_double(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h)
{
int src_x = 0;
int src_y = 0;
int dst = 0;
int dst_w = src_w << 1;
s16 tmp;
for(src_y = 0; src_y < src_h * src_w; src_y += src_w){
for (src_x = 0; src_x < src_w; src_x++){
tmp = *src_image++;
dst = (src_y << 2) + (src_x << 1);
dst_image[dst] = tmp;
dst_image[dst+1] = tmp;
dst+=dst_w;
dst_image[dst] = tmp;
dst_image[dst+1] = tmp;
}
}
}
/* $$$TODO: finish this */
void pdp_resample_padcrop(s16 __attribute__((unused)) *src_image,
s16 __attribute__((unused)) *dst_image,
s32 src_w, s32 src_h, s32 dst_w, s32 dst_h)
{
int shift_x = (dst_w - src_w) / 2;
int shift_y = (dst_h - src_h) / 2;
}
|
