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/*
* Pure Data Packet. common image processing routines.
* Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
*
* 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.
*
*/
/*
This file contains common code for (portable) low level image processing objects
pdp_imageproc_* methods
The rest is int pdp_imageproc_<platform>.c
There are also highlevel dispatcher methods that operate on packets:
pdp_imageproc_dispatch_* methods
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "pdp_imageproc.h"
#include "pdp_image.h"
#include "pdp_mem.h"
#include "pdp_packet.h"
#define CLAMP16(x) (((x) > 0x7fff) ? 0x7fff : (((x) < -0x7fff) ? -0x7fff : (x)))
u32 pdp_imageproc_legalwidth(int i)
{
if (i>1024) return 1024;
if (i>0) return ((((i-1)>>3)+1)<<3);
return 8;
}
u32 pdp_imageproc_legalheight(int i)
{
if (i>1024) return 1024;
if (i>0) return ((((i-1)>>3)+1)<<3);
return 8;
}
u32 pdp_imageproc_legalwidth_round_down(int i)
{
if (i>1024) return 1024;
if (i>8) return ((i>>3)<<3);
return 8;
}
u32 pdp_imageproc_legalheight_round_down(int i)
{
if (i>1024) return 1024;
if (i>8) return ((i>>3)<<3);
return 8;
}
/* check if two packets are allocated and of the same type */
bool pdp_packet_compat(int packet0, int packet1)
{
t_pdp *header0 = pdp_packet_header(packet0);
t_pdp *header1 = pdp_packet_header(packet1);
if (!(header1)) return 0;
if (!(header0)) return 0;
if (header0->type != header1->type) return 0;
return 1;
}
/* some operations */
/* logic operators */
void pdp_imageproc_xor_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
u32 *plane = (u32 *)image;
u32 *plane2 = (u32 *)image2;
int count = (width * height) >> 1;
int i;
for (i=0; i<count; i++){
plane[i] ^= plane2[i];
}
}
void pdp_imageproc_and_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
u32 *plane = (u32 *)image;
u32 *plane2 = (u32 *)image2;
int count = (width * height) >> 1;
int i;
for (i=0; i<count; i++){
plane[i] &= plane2[i];
}
}
void pdp_imageproc_or_process(void *x, u32 width, u32 height, s16 *image, s16 *image2)
{
u32 *plane = (u32 *)image;
u32 *plane2 = (u32 *)image2;
int count = (width * height) >> 1;
int i;
for (i=0; i<count; i++){
plane[i] |= plane2[i];
}
}
void pdp_imageproc_not_process(void *x, u32 width, u32 height, s16 *image)
{
u32 *plane = (u32 *)image;
int count = (width * height) >> 1;
int i;
for (i=0; i<count; i++){
plane[i] ^= 0xffffffff;
}
}
void pdp_imageproc_mask_process(void *x, u32 width, u32 height, s16 *image)
{
u32 mask = (u32)x;
u32 *plane = (u32 *)image;
int count = (width * height) >> 1;
int i;
mask = (mask & 0xffff) | (mask << 16);
for (i=0; i<count; i++){
plane[i] &= mask;
}
}
// produce a plasma image
// note: random number generator can be platform specific
// however, it should be seeded. (same seed produces the same result)
typedef struct
{
u32 seed;
s32 scale;
} t_plasma;
static inline s16 _rand_s16(void)
{
return (s16)(random()<<0);
}
static inline s16 _new_color(s32 one, s32 two, s32 scale)
{
return CLAMP16((one >> 1) + (two >> 1) + ((scale * _rand_s16()) >> 16));
//return (one >> 1) + (two >> 1);
}
void *pdp_imageproc_plasma_new(void){return pdp_alloc(sizeof(t_plasma));}
void pdp_imageproc_plasma_delete(void *x){pdp_dealloc(x);}
void pdp_imageproc_plasma_setseed(void *x, float seed)
{
*((float *)x) = seed;
}
void pdp_imageproc_plasma_setturbulence(void *x, float f)
{
((t_plasma *)x)->scale = CLAMP16(f * ((float)0x7fff));
}
static void _plasma_subdiv(u32 w, u32 h, u32 s, s16 *image, int calc_left, int calc_top, s32 scale)
{
int w0 = ((w-1)>>1); // width of left segments
int h0 = ((h-1)>>1); // heigth of top segments
int w1 = w - w0;
int h1 = h - h0;
/* conditions: w0 <= w1, h0 <= h1 */
/* original coordinates */
int topleft = 0;
int topright = w-1;
int bottomleft = s * (h-1);
int bottomright = bottomleft + topright;
/* new subdivision coordinates */
int top = w0;
int left = s * h0;
int bottom = bottomleft + w0;
int right = topright + left;
int center = left + top;
if (w0 && h0){ /* left-right and top-bottom subdivide */
/* calculate corner pixel colours */
if (calc_top) image[top] = _new_color(image[topleft], image[topright], scale);
if (calc_left) image[left] = _new_color(image[topleft], image[bottomleft], scale);
image[right] = _new_color(image[topright], image[bottomright], scale);
image[bottom] = _new_color(image[bottomleft], image[bottomright], scale);
image[center] = (_new_color(image[top], image[bottom], scale) >> 1)
+(_new_color(image[left], image[right], scale) >> 1);
/* subdivide (with overlap) */
_plasma_subdiv(w0+1, h0+1, s, &image[topleft], 1, 1, scale);
_plasma_subdiv(w1, h0+1, s, &image[top], 0, 1, scale);
_plasma_subdiv(w0+1, h1, s, &image[left], 1, 0, scale);
_plasma_subdiv(w1, h1, s, &image[center], 0, 0, scale);
}
else if(h0) { /* top-bottom subdivide */
//post("h:%d", h);
/* calculate corner pixel colours */
if(calc_left) image[left] = _new_color(image[topleft], image[bottomleft], scale);
image[right] = _new_color(image[topright], image[bottomright], scale);
/* subdivide (without overlap) */
_plasma_subdiv(w, h0+1, s, &image[topleft], 1, 0, scale);
_plasma_subdiv(w, h1, s, &image[left], 1, 0, scale);
}
else if (w0){ /* left-right subdivide */
/* calculate corner pixel colours */
if (calc_top) image[top] = _new_color(image[topleft], image[topright], scale);
image[bottom] = _new_color(image[bottomleft], image[bottomright],scale);
/* subdivide with overlap */
_plasma_subdiv(w0+1, h, s, &image[topleft], 0, 1, scale);
_plasma_subdiv(w1, h, s, &image[top], 0, 1, scale);
}
}
void pdp_imageproc_plasma_process(void *x, u32 width, u32 height, s16 *image)
{
s32 scale = (((t_plasma *)x)->scale);
srandom (((t_plasma *)x)->seed);
/* set initial border colours */
image[0] = _rand_s16();
image[width-1] = _rand_s16();
image[width * (height-1)] = _rand_s16();
image[width * height - 1] = _rand_s16();
/* subdivide */
_plasma_subdiv(width, height, width, image, 1, 1, scale);
((t_plasma *)x)->seed = random();
}
void pdp_imageproc_zero_process(void *x, u32 width, u32 height, s16 *image)
{
int bytesize = (width * height) << 1;
memset(image, 0, bytesize);
}
void pdp_imageproc_constant_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
u32 value = (u32)x;
u32 *plane = (u32 *)image;
int wordsize = (width * height) >> 1;
value = (value & 0xffff) | (value << 16);
for (i=0; i<wordsize; i++){
plane[i] = value;
}
}
/* other stateless operators */
/* some 2x16bit vector ops */
/* some bit shuffling to ensure 32 bit accesses
get the sign bit extended as a mask: - : 0xffff +: 0x0000 */
static inline u32 _sign(s32 invec)
{
s32 mask_top = invec;
s32 mask_bot = invec;
mask_top &= 0x80000000; /* isolate top sign bit */
mask_bot <<= 16; /* shift bottom word to top word */
mask_bot &= 0x80000000; /* isolate bottom sign bit */
mask_top >>= 15; /* shift sign bit into top word */
mask_bot >>= 15;
mask_bot = (s32)(((u32)mask_bot) >> 16); /* shift top word into bottom word */
return mask_top |mask_bot;
}
/* clear the least significant bit of the top word
to ensure a decoupled vector add */
static inline void _decouple(s32 *invec)
{
*invec &= 0xfffeffff;
}
void pdp_imageproc_abs_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
s32 *wimage = (s32 *)image;
int wsize = (width * height) >> 1;
for (i=0; i<wsize; i++){
/* this computes c = (c >= 0) ? (c) : (~c) */
/* not is used instead of neg to prevent overflow on 0x8000 */
/* this maps both 0 and -1 to 0 */
wimage[i] ^= _sign(wimage[i]);
}
}
void pdp_imageproc_zthresh_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
s32 *wimage = (s32 *)image;
int wsize = (width * height) >> 1;
for (i=0; i<wsize; i++){
/* this computes c = (c >= 0) ? (c) : (0) */
wimage[i] &= ~_sign(wimage[i]);
}
}
/* hard thresholding: x contains a positive unsigned short int */
void pdp_imageproc_hardthresh_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
s32 thresh = (s32)x;
s32 sign1, isign2, a;
s32 *wimage = (s32 *)image;
int wsize = (width * height) >> 1;
thresh |= (thresh << 16);
for (i=0; i<wsize; i++){
a = wimage[i];
sign1 = _sign(a);
a ^= sign1; /* take abs */
_decouple(&a);
a -= thresh; /* subtract threshold */
isign2 = ~ _sign(a);
a &= isign2; /* zero thresh */
_decouple(&a);
a += thresh & isign2; /* add threshold (if not zero thresholded)*/
a ^= sign1;
wimage[i] = a;
}
}
/* soft thresholding: x contains a positive unsigned short int */
void pdp_imageproc_softthresh_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
s32 thresh = (s32)x;
s32 sign1, sign2, a;
s32 *wimage = (s32 *)image;
int wsize = (width * height) >> 1;
thresh |= thresh << 16;
for (i=0; i<wsize; i++){
a = wimage[i];
sign1 = _sign(a);
a ^= sign1; /* take abs */
_decouple(&a);
a -= thresh; /* subtract threshold */
sign2 = _sign(a);
a &= ~ sign2; /* zero thresh */
_decouple(&a);
//a += thresh; /* add threshold */
a ^= sign1;
wimage[i] = a;
}
}
/* turns an image into a positive andmask */
void pdp_imageproc_ispositive_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
s32 *wimage = (s32 *)image;
int wsize = (width * height) >> 1;
for (i=0; i<wsize; i++){
wimage[i] = ~_sign(wimage[i]);
}
}
/* get sign */
void pdp_imageproc_sign_process(void *x, u32 width, u32 height, s16 *image)
{
int i;
s32 *wimage = (s32 *)image;
int wsize = (width * height) >> 1;
for (i=0; i<wsize; i++){
wimage[i] = _sign(wimage[i]) ^ 0x7fff7fff;
}
}
/* flip left <-> right */
void pdp_imageproc_flip_lr_process(void *dummy, u32 width, u32 height, s16 *image)
{
u32 y;
s16 tmp, *l, *r;
for (y=0; y<height; y++){
l = image;
r = image + width - 1;
while (l < r){
tmp = *l;
*l = *r;
*r = tmp;
l++;
r--;
}
image += width;
}
}
void pdp_llconv_flip_top_bottom(s16 *data, int width, int height, int pixelsize);
void pdp_imageproc_flip_tb_process(void *dummy, u32 width, u32 height, s16 *image)
{
pdp_llconv_flip_top_bottom(image, width, height, 2);
}
/* image processing dispatcher methods */
/* if the first packet contains a nonzero channel mask, it will be used instead
of the one supplied as argument to the dispatcher functions.
the packet's channel mask will be reset to 0 */
void pdp_imageproc_dispatch_1buf(void (*process_routine)(void*, u32, u32, s16*), void *x, u32 chanmask, int packet0)
{
t_pdp *header0;
t_image *image0;
s16 *idata0;
unsigned int w,h,d,plane_size,mask;
/* if packet is not a valid image return without doing anything */
if (!(pdp_packet_image_isvalid(packet0))) return;
header0 = pdp_packet_header(packet0);
image0 = pdp_packet_image_info(packet0);
idata0 = pdp_packet_data (packet0);
w = image0->width;
h = image0->height;
d = image0->depth;
plane_size = w*h;
if (image0->chanmask) chanmask = image0->chanmask;
image0->chanmask = 0;
switch(image0->encoding){
case PDP_IMAGE_GREY:
if (chanmask & 1) (*process_routine)(x, w, h, idata0);
break;
case PDP_IMAGE_YV12:
if (chanmask & 1) (*process_routine)(x, w, h, idata0);
idata0 += plane_size;
plane_size >>= 2;
w >>= 1;
h >>= 1;
if (chanmask & 2) (*process_routine)(x, w, h, idata0);
idata0 += plane_size;
if (chanmask & 4) (*process_routine)(x, w, h, idata0);
break;
case PDP_IMAGE_MCHP:
mask = 1;
while (d--){
if (chanmask & mask) (*process_routine)(x, w, h, idata0);
idata0 += plane_size;
mask <<= 1;
}
break;
default:
break;
}
}
void pdp_imageproc_dispatch_2buf(void (*process_routine)(void*, u32, u32, s16*, s16 *), void *x, u32 chanmask, int packet0, int packet1)
{
t_pdp *header0;
t_image *image0;
s16 *idata0, *idata1;
unsigned int w,h,d,plane_size,mask;
/* if packets are not compatible images, return without doing anything */
if (!(pdp_packet_image_compat(packet0, packet1))) return;
header0 = pdp_packet_header(packet0);
image0 = pdp_packet_image_info(packet0);
idata0 = pdp_packet_data (packet0);
idata1 = pdp_packet_data (packet1);
w = image0->width;
h = image0->height;
d = image0->depth;
plane_size = w*h;
if (image0->chanmask) chanmask = image0->chanmask;
image0->chanmask = 0;
switch(image0->encoding){
case PDP_IMAGE_GREY:
if (chanmask & 1) (*process_routine)(x, w, h, idata0, idata1);
break;
case PDP_IMAGE_YV12:
if (chanmask & 1) (*process_routine)(x, w, h, idata0, idata1);
idata0 += plane_size;
idata1 += plane_size;
plane_size >>= 2;
w >>= 1;
h >>= 1;
if (chanmask & 2) (*process_routine)(x, w, h, idata0, idata1);
idata0 += plane_size;
idata1 += plane_size;
if (chanmask & 4) (*process_routine)(x, w, h, idata0, idata1);
break;
case PDP_IMAGE_MCHP:
mask = 1;
while (d--){
if (chanmask & mask) (*process_routine)(x, w, h, idata0, idata1);
idata0 += plane_size;
idata1 += plane_size;
mask <<= 1;
}
break;
default:
break;
}
}
void pdp_imageproc_dispatch_3buf(void (*process_routine)(void*, u32, u32, s16*, s16 *, s16 *), void *x, u32 chanmask, int packet0, int packet1, int packet2)
{
t_pdp *header0;
t_image *image0;
s16 *idata0, *idata1, *idata2;
unsigned int w,h,d,plane_size, mask;
/* if packets are not compatible images, return without doing anything */
if (!((pdp_packet_image_compat(packet0, packet1))
&&(pdp_packet_image_compat(packet0, packet1)))) return;
header0 = pdp_packet_header(packet0);
image0 = pdp_packet_image_info(packet0);
idata0 = pdp_packet_data (packet0);
idata1 = pdp_packet_data (packet1);
idata2 = pdp_packet_data (packet2);
w = image0->width;
h = image0->height;
d = image0->depth;
plane_size = w*h;
if (image0->chanmask) chanmask = image0->chanmask;
image0->chanmask = 0;
switch(image0->encoding){
case PDP_IMAGE_GREY:
if (chanmask & 1)(*process_routine)(x, w, h, idata0, idata1, idata2);
break;
case PDP_IMAGE_YV12:
if (chanmask & 1)(*process_routine)(x, w, h, idata0, idata1, idata2);
idata0 += plane_size;
idata1 += plane_size;
idata2 += plane_size;
plane_size >>= 2;
w >>= 1;
h >>= 1;
if (chanmask & 2)(*process_routine)(x, w, h, idata0, idata1, idata2);
idata0 += plane_size;
idata1 += plane_size;
idata2 += plane_size;
if (chanmask & 4)(*process_routine)(x, w, h, idata0, idata1, idata2);
break;
case PDP_IMAGE_MCHP:
mask = 1;
while (d--){
if (chanmask & mask) (*process_routine)(x, w, h, idata0, idata1, idata2);
idata0 += plane_size;
idata1 += plane_size;
idata2 += plane_size;
mask <<= 1;
}
break;
default:
break;
}
}
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