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|
/*
* Pure Data Packet. portable image processing 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 <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "pdp_imageproc.h"
/* pdp memory alloc/dealloc prototype */
void *pdp_alloc(int size);
void pdp_dealloc(void *);
// utility stuff
inline static s32 float2fixed(float f)
{
if (f > 1) f = 1;
if (f < -1) f = -1;
f *= 0x7fff;
return (s32)f;
}
#define CLAMP16(x) (((x) > 0x7fff) ? 0x7fff : (((x) < -0x7fff) ? -0x7fff : (x)))
// add two images
void pdp_imageproc_add_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
int a, b;
unsigned int i;
for (i=0; i<width*height; i++){
a = (int)image[i];
b = (int)image2[i];
image[i] = (s16)(CLAMP16(a+b));
}
}
// mul two images
void pdp_imageproc_mul_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
int a, b;
unsigned int i;
for (i=0; i<width*height; i++){
a = (int)image[i];
b = (int)image2[i];
image[i] = (s16)((a*b)>>15);
}
}
// mix 2 images
void *pdp_imageproc_mix_new(void){return pdp_alloc(2*sizeof(s32));}
int pdp_imageproc_mix_nb_stackwords(void) {return PDP_IMAGEPROC_NB_STACKWORDS(2*sizeof(s32));}
void pdp_imageproc_mix_delete(void *x) {pdp_dealloc (x);}
void pdp_imageproc_mix_setleftgain(void *x, float gain)
{
s32 *d = (s32 *)x;
d[0] = float2fixed(gain);
}
void pdp_imageproc_mix_setrightgain(void *x, float gain)
{
s32 *d = (s32 *)x;
d[1] = float2fixed(gain);
}
void pdp_imageproc_mix_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
s32 *d = (s32 *)x;
u32 i;
s32 a,b;
for(i=0; i<width*height; i++){
a = (s32)image[i];
b = (s32)image2[i];
a = (a*d[0] + b*d[1]) >> 15;
image[i] = (s16)CLAMP16(a);
}
}
// random mix 2 images
void *pdp_imageproc_randmix_new(void){return pdp_alloc(2*sizeof(s32));;}
int pdp_imageproc_randmix_nb_stackwords(void) {return PDP_IMAGEPROC_NB_STACKWORDS(2*sizeof(s32));}
void pdp_imageproc_randmix_delete(void *x) {pdp_dealloc(x);}
void pdp_imageproc_randmix_setthreshold(void *x, float threshold)
{
s32 *d = (s32 *)x;
if (threshold > 1.0f) threshold = 1.0f;
if (threshold < 0.0f) threshold = 0.0f;
d[0] = float2fixed(threshold);
}
void pdp_imageproc_randmix_setseed(void *x, float seed)
{
s32 *d = (s32 *)x;
d[1] = float2fixed(seed);
}
void pdp_imageproc_randmix_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
s32 *d = (s32 *)x;
u32 i;
s16 r;
srandom((u32)d[1]);
for(i=0; i<width*height; i++){
// get a random val between 0 and 0x7fff
r = (s16)(random() & 0x7fff);
if (r < d[0]) image[i] = image2[i];
}
}
// 3x1 or 1x3 in place convolution
// orientation
void *pdp_imageproc_conv_new(void){return(pdp_alloc(6*sizeof(s32)));}
void pdp_imageproc_conv_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_conv_setmin1(void *x, float val)
{
s32 *d = (s32 *)x;
d[0] = float2fixed(val);
}
void pdp_imageproc_conv_setzero(void *x, float val)
{
s32 *d = (s32 *)x;
d[1] = float2fixed(val);
}
void pdp_imageproc_conv_setplus1(void *x, float val)
{
s32 *d = (s32 *)x;
d[2] = float2fixed(val);
}
void pdp_imageproc_conv_setbordercolor(void *x, float val)
{
s32 *d = (s32 *)x;
d[3] = float2fixed(val);
}
void pdp_imageproc_conv_setorientation(void *x, u32 val){((u32 *)x)[4] = val;}
void pdp_imageproc_conv_setnbpasses(void *x, u32 val){((u32 *)x)[5] = val;}
static inline void pdp_imageproc_conv_scanline(void *x, s16 *data, u32 count, s32 stride)
{
s32 *d = (s32 *)x;
s32 a,b,c,r;
u32 i;
a = d[3]; //border
b = data[0];
c = data[stride];
for(i = 0; i < count-2; i++){
r = a*d[0] + b*d[1] + c*d[2];
a = data[0];
b = data[stride];
c = data[stride<<1];
data[0] = (s16)CLAMP16(r>>15);
data += stride;
}
r = a*d[0] + b*d[1] + c*d[2];
a = data[0];
b = data[stride];
c = d[3]; //border
data[0] = (s16)CLAMP16(r>>15);
r = a*d[0] + b*d[1] + c*d[2];
data[stride] = (s16)CLAMP16(r>>15);
}
void pdp_imageproc_conv_process(void *x, u32 width, u32 height, s16 *image)
{
s32 *d = (s32 *)x;
u32 i, j;
u32 orientation = d[4];
u32 nbp = d[5];
if (orientation == PDP_IMAGEPROC_CONV_HORIZONTAL){
for(i=0; i<width*height; i+=width)
for(j=0; j<nbp; j++)
pdp_imageproc_conv_scanline(x, image+i, width, 1);
}
if (orientation == PDP_IMAGEPROC_CONV_VERTICAL){
for(i=0; i<width; i++)
for(j=0; j<nbp; j++)
pdp_imageproc_conv_scanline(x, image+i, height, width);
}
}
// apply a gain to an image
void *pdp_imageproc_gain_new(void){return(pdp_alloc(2*sizeof(s32)));}
void pdp_imageproc_gain_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_gain_setgain(void *x, float gain)
{
/* convert float to s16 + shift */
s32 *d = (s32 *)x;
s32 g;
int i;
float sign;
s32 shift = 0;
sign = (gain < 0) ? -1 : 1;
gain *= sign;
/* max shift = 16 */
for(i=0; i<=16; i++){
if (gain < 0x4000){
gain *= 2;
shift++;
}
else break;
}
gain *= sign;
g = (s32) gain;
//g = 0x4000;
//shift = 14;
d[0]=g;
d[1]=shift;
}
void pdp_imageproc_gain_process(void *x, u32 width, u32 height, s16 *image)
{
s32 *d = (s32 *)x;
s32 a;
u32 i;
for (i=0; i<width*height; i++){
a = (s32)image[i];
image[i] = (s16)(CLAMP16((a * d[0]) >> d[1]));
}
}
// colour rotation for 2 colour planes
void *pdp_imageproc_crot2d_new(void){return pdp_alloc(4*sizeof(s32));}
void pdp_imageproc_crot2d_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_crot2d_setmatrix(void *x, float *matrix)
{
s32 *d = (s32 *)x;
d[0] = float2fixed(matrix[0]);
d[1] = float2fixed(matrix[1]);
d[2] = float2fixed(matrix[2]);
d[3] = float2fixed(matrix[3]);
}
void pdp_imageproc_crot2d_process(void *x, s16 *image, u32 width, u32 height)
{
s32 *d = (s32 *)x;
u32 i,j;
s32 a1,a2,c1,c2;
for(i=0, j=width*height; i<width*height; i++, j++){
c1 = (s32)image[i];
c2 = (s32)image[j];
a1 = d[0] * c1;
a2 = d[1] * c1;
a1+= d[2] * c2;
a2+= d[3] * c2;
a1 >>= 15;
a2 >>= 15;
image[i] = (s16)CLAMP16(a1);
image[j] = (s16)CLAMP16(a2);
}
}
// biquad and biquad time
typedef struct
{
s32 ma1;
s32 ma2;
s32 b0;
s32 b1;
s32 b2;
s32 u0;
s32 u1;
s32 u0_save;
s32 u1_save;
u32 nbpasses;
u32 direction;
} t_bq;
void *pdp_imageproc_bq_new(void){return pdp_alloc(sizeof(t_bq));}
void pdp_imageproc_bq_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_bq_setnbpasses(void *x, u32 i){((t_bq *)x)->nbpasses = i;}
void pdp_imageproc_bq_setdirection(void *x, u32 i){((t_bq *)x)->direction = i;}
void pdp_imageproc_bq_setcoef(void *x, float *coef) // a0,-a1,-a2,b0,b1,b2,u0,u1
{
s32 *d = (s32 *)x;
float ia0 = 1.0f / coef[0];
/* all coefs are s1.14 fixed point */
/* representing values -2 < x < 2 */
/* so scale down before using the ordinary s0.15 float->fixed routine */
ia0 *= 0.5f;
// coef
d[0] = float2fixed(ia0*coef[1]); // -a1
d[1] = float2fixed(ia0*coef[2]); // -a2
d[2] = float2fixed(ia0*coef[3]); // b0
d[3] = float2fixed(ia0*coef[4]); // b1
d[4] = float2fixed(ia0*coef[5]); // b2
// state to reset too
d[5] = float2fixed(coef[6]);
d[6] = float2fixed(coef[7]);
}
#define A1 d[0]
#define A2 d[1]
#define B0 d[2]
#define B1 d[3]
#define B2 d[4]
/*
# DIRECT FORM II BIQUAD (from pixel_biquad_s16.s)
#
# y[k] = b0 * x[k] + u1[k-1]
# u1[k] = b1 * x[k] + u2[k-1] - a1 * y[k]
# u2[k] = b2 * x[k] - a2 * y[k]
*/
/* remark A1 and A2 are already negated) */
static inline void pdp_imageproc_bq_scanline(void *x, s16 *data, u32 count, s32 stride)
{
s32 *d = (s32 *)x;
s32 u1,u2, xx, yy;
u32 i;
u1 = d[7];
u2 = d[8];
for(i = 0; i < count; i++){
xx = (s32)data[0];
yy = ((B0 * xx)>>14) + u1;
u1 = ((B1 * xx)>>14) + u2 + ((A1 * yy)>>14);
u2 = ((B2 * xx)>>14) + ((A2 * yy)>>14);
data[0] = (s16)CLAMP16(yy);
data += stride;
}
d[7] = u1;
d[8] = u2;
}
void pdp_imageproc_bqt_process(void *x, u32 width, u32 height, s16 *image, s16 *state1, s16 *state2)
{
s32 *d = (s32 *)x;
u32 i;
s32 u1, u2, xx, yy;
for (i=0; i<width*height; i++){
xx = (s32)image[i];
u1 = (s32)state1[i];
u2 = (s32)state2[i];
yy = ((B0 * xx)>>14) + u1;
u1 = ((B1 * xx)>>14) + u2 + ((A1 * yy)>>14);
u2 = ((B2 * xx)>>14) + ((A2 * yy)>>14);
image[i] = (s16)CLAMP16(yy);
state1[i] = (s16)CLAMP16(u1);
state2[i] = (s16)CLAMP16(u2);
}
}
void pdp_imageproc_bq_process(void *x, u32 width, u32 height, s16 *data)
{
s32 *d = (s32 *)x;
u32 nbp = d[9];
u32 direction = d[10];
unsigned int i,j, offset;
/* VERTICAL */
offset = (height-1)*width;
if ((direction & PDP_IMAGEPROC_BIQUAD_TOP2BOTTOM)
&& (direction & PDP_IMAGEPROC_BIQUAD_BOTTOM2TOP)){
for(i=0; i<width; i++){
for (j=0; j<nbp; j++){
pdp_imageproc_bq_scanline(x, data+i, height, width); //T->B
pdp_imageproc_bq_scanline(x, data+offset+i, height, -width); //B->T
}
}
}
else if (direction & PDP_IMAGEPROC_BIQUAD_TOP2BOTTOM){
for(i=0; i<width; i++){
for (j=0; j<nbp; j++){
pdp_imageproc_bq_scanline(x, data+i, height, width); //T->B
}
}
}
else if (direction & PDP_IMAGEPROC_BIQUAD_BOTTOM2TOP){
for(i=0; i<width; i++){
for (j=0; j<nbp; j++){
pdp_imageproc_bq_scanline(x, data+offset+i, height, -width); //B->T
}
}
}
/* HORIZONTAL */
offset = width-1;
if ((direction & PDP_IMAGEPROC_BIQUAD_LEFT2RIGHT)
&& (direction & PDP_IMAGEPROC_BIQUAD_RIGHT2LEFT)){
for(i=0; i<(width*height); i += width){
for (j=0; j<nbp; j++){
pdp_imageproc_bq_scanline(x, data+i, width, 1); //L->R
pdp_imageproc_bq_scanline(x, data+offset+i, width, -1); //R->L
}
}
}
else if (direction & PDP_IMAGEPROC_BIQUAD_LEFT2RIGHT){
for(i=0; i<(width*height); i += width){
for (j=0; j<nbp; j++){
pdp_imageproc_bq_scanline(x, data+i, width, 1); //L->R
}
}
}
else if (direction & PDP_IMAGEPROC_BIQUAD_RIGHT2LEFT){
for(i=0; i<(width*height); i += width){
for (j=0; j<nbp; j++){
pdp_imageproc_bq_scanline(x, data+offset+i, width, -1); //R->L
}
}
}
}
// produce a random image
// note: random number generator can be platform specific
// however, it should be seeded. (same seed produces the same result)
void *pdp_imageproc_random_new(void){return pdp_alloc(sizeof(s32));}
void pdp_imageproc_random_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_random_setseed(void *x, float seed)
{
float *f = (float *)x;
u32 *d = (u32 *)x;
f[0] = seed;
srandom(d[0]);
}
void pdp_imageproc_random_process(void *x, u32 width, u32 height, short int *image)
{
u32 *d = (u32 *)x;
u32 i;
s32 r;
srandom(d[0]);
for (i=0; i<(width*height); i++) {
r = random();
image[i] = r;
}
d[0] = random();
}
/* resampling code */
// zoom + rotate
/* bilinear resampling core routine */
/* virtual coordinates are the lowest 16 bits in virt_x and virt_y*/
static inline 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);
}
typedef struct
{
float centerx;
float centery;
float zoomx;
float zoomy;
float angle;
} t_affine_map;
void *pdp_imageproc_resample_affinemap_new(void)
{
t_affine_map *a = (t_affine_map *)pdp_alloc(sizeof(t_affine_map));
a->centerx = 0.5;
a->centery = 0.5;
a->zoomx = 1.0;
a->zoomy = 1.0;
a->angle = 0.0f;
return (void *)a;
}
void pdp_imageproc_resample_affinemap_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_resample_affinemap_setcenterx(void *x, float f){((t_affine_map *)x)->centerx = f;}
void pdp_imageproc_resample_affinemap_setcentery(void *x, float f){((t_affine_map *)x)->centery = f;}
void pdp_imageproc_resample_affinemap_setzoomx(void *x, float f){((t_affine_map *)x)->zoomx = f;}
void pdp_imageproc_resample_affinemap_setzoomy(void *x, float f){((t_affine_map *)x)->zoomy = f;}
void pdp_imageproc_resample_affinemap_setangle(void *x, float f){((t_affine_map *)x)->angle = f;}
void pdp_imageproc_resample_affinemap_process(void *x, u32 width, u32 height, s16 *srcimage, s16 *dstimage)
{
t_affine_map *a = (t_affine_map *)x;
double izx = 1.0f / (a->zoomx);
double izy = 1.0f / (a->zoomy);
double scale = (double)0xffffffff;
double scalew = scale / ((double)(width - 1));
double scaleh = scale / ((double)(height - 1));
double cx = ((double)a->centerx) * ((double)(width - 1));
double cy = ((double)a->centery) * ((double)(height - 1));
double angle = a->angle * (-M_PI / 180.0);
double c = cos(angle);
double s = sin(angle);
/* affine x, y mappings in screen coordinates */
double mapx(double _x, double _y){return cx + izx * ( c * (_x-cx) + s * (_y-cy));}
double mapy(double _x, double _y){return cy + izy * (-s * (_x-cx) + c * (_y-cy));}
u32 colstate_x = (u32)(scalew * mapx(0,0));
u32 colstate_y = (u32)(scaleh * mapy(0,0));
u32 rowstate_x = colstate_x;
u32 rowstate_y = colstate_y;
u32 row_inc_x = (u32)(scalew * (mapx(1,0)-mapx(0,0)));
u32 row_inc_y = (u32)(scaleh * (mapy(1,0)-mapy(0,0)));
u32 col_inc_x = (u32)(scalew * (mapx(0,1)-mapx(0,0)));
u32 col_inc_y = (u32)(scaleh * (mapy(0,1)-mapy(0,0)));
u32 i,j;
for (j=0; j<height; j++){
for (i=0; i<width; i++){
*dstimage++ = pdp_resample_bilin(srcimage, width, height, rowstate_x>>16, rowstate_y>>16);
rowstate_x += row_inc_x;
rowstate_y += row_inc_y;
}
colstate_x += col_inc_x;
colstate_y += col_inc_y;
rowstate_x = colstate_x;
rowstate_y = colstate_y;
}
}
// polynomials
typedef struct
{
u32 order;
u32 nbpasses;
s32 coefs[0];
} t_cheby;
void *pdp_imageproc_cheby_new(int order)
{
t_cheby *z;
int i;
if (order < 2) order = 2;
z = (t_cheby *)pdp_alloc(sizeof(t_cheby) + (order + 1) * sizeof(s32));
z->order = order;
z->coefs[0] = 0;
z->coefs[1] = 0x7fff;
for (i=2; i<=order; i++) z->coefs[i] = 0;
return z;
}
void pdp_imageproc_cheby_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_cheby_setnbpasses(void *x, u32 n){((t_cheby *)x)->nbpasses = n;}
void pdp_imageproc_cheby_setcoef(void *x, u32 n, float f)
{
t_cheby *z = (t_cheby *)x;
if (n <= z->order){
z->coefs[n] = (s32)(f * 32767.0f); // coefs are in s16.15 format
}
}
void pdp_imageproc_cheby_process(void *x, u32 width, u32 height, s16 *image)
{
t_cheby *z = (t_cheby *)x;
u32 iterations = z->nbpasses;
u32 i,j,k;
s32 *c = z->coefs;
for (j=0; j < (height*width); j++){
s32 acc = (s32)image[j];
for (i=0; i<iterations; i++){
s32 T2 = 0x7fff; /* 1 */
s32 T1 = acc;
s32 t;
s32 in = acc;
acc = c[0] + ((in*c[1])>>15);
for (k=2; k<=z->order; k++){
t = ((T1*in)>>14) - T2; /* T_n = 2 x T_n-1 - T_n-2 */
T2 = T1;
T1 = t;
acc += ((c[k] * t)>>15);
}
}
image[j] = (s16)(CLAMP16(acc));
}
}
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