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imagefx.c
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imagefx.c
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// some simple image processing demos
#include "cambadge.h"
#include "globals.h"
// states used by this application
#define s_start 0
#define s_run 1
#define s_quit 2
#define bufsize (128*96+1)
#define bufstart 8
#define linelength 129
char* imagefx(unsigned int action) {
static unsigned int state, effect, page, val1, val2;
unsigned int x, y, i, d, r, g, b,e,f;
static unsigned char explock;
switch (action) {
case act_name: return ("IMAGEFX");
case act_help: return ("Camera effects");
case act_start:
// called once when app is selected from menu
state = s_start;
effect = 0;
cam_enable(cammode_128x96_z1_mono);
cam_grabenable(camen_grab, bufstart - 1, 0);
page = 1;
val1 = val2 = 0;
return (0);
} //switch
if (action != act_poll) return (0);
if (butpress & powerbut) state = s_quit; // exit with nonzero value to indicate we want to quit
if (butpress & but1) {
effect++;
val1 = val2 = 0;
state = s_start;
}
if (butpress & but2) {
explock ^= 1;
cam_setreg(0x13, explock ? 0xe0 : 0xe7);
}
if (butpress & but4) if (led1) led1_on;
else led1_off;
switch (state) {
case s_start:
printf(cls top butcol "EXIT " whi inv "IMAGEFX" inv butcol " LIGHT" bot "Effect");
state = s_run;
for (i = 0; i != cambufsize; cambuffer[i++] = 0);
case s_run:
if (!cam_newframe) break;
printf(tabx9 taby12 butcol);
if (explock) printf(inv "ExLock" inv);
else printf("ExLock");
printf(tabx0 taby11 yel);
switch (effect) {
case 0: // update one line per frame
printf("Slowscan");
monopalette(0, 255);
plotblock(0, 11 + ypixels - val1, xpixels, 1, c_grn);
dispimage(0, 12 + ypixels - val1, xpixels, 1, (img_mono | img_revscan), cambuffer + bufstart + val1 * xpixels);
if (++val1 == ypixels - 1) val1 = 0;
break;
unsigned char* charptr;
unsigned short* shortptr;
case 1: // temporal FIR filter
printf("Ghost");
charptr = cambuffer + bufstart;
shortptr = cambuffer_s + (bufstart + bufsize) / 2; // shorts to store pixel:fraction as fixed-point to avoid rounding errors
y = 250;
for (i = 0; i != xpixels * ypixels; i++) {
x = *charptr++;
d = x * (255 - y)+((unsigned int) *shortptr * y) / 256; // mix proportion of old and new pixel
*shortptr++ = d;
}
monopalette(0, 255);
// img_skip skips over the lsbytes, displaying the MSbyte
dispimage(0, 12, xpixels, ypixels, (img_mono | img_revscan | img_skip1), cambuffer + bufsize + bufstart);
break;
case 3: // use camera capture start parameters to de-stabilise
printf("Unstabilise");
monopalette(0, 255);
xstart = 30 + randnum(-15, 15);
ystart = 30 + randnum(-15, 15);
dispimage(0, 12, xpixels, ypixels, (img_mono | img_revscan), cambuffer + bufstart);
break;
unsigned char * inptr,*outptr;
int op,np,er,z;
case 2 :
printf("Dither");//Floyd=stienberg error diffusion
for(y=0;y!=ypixels;y++) {
for(x=0;x!=xpixels;x++){
inptr=cambuffer+bufstart+x+y*xpixels;
op=*inptr;
if(op>0x80) np=0xff;else np=0;
er=op-np;
*inptr=np;
inptr++;//right
z=(int) *inptr +er*7/16;
if(z<0) z=0; else if(z>255) z=255;
*inptr=z;
inptr+=(xpixels-2); // down & left
z=(int) *inptr +er*3/16;
if(z<0) z=0; else if(z>255) z=255;
*inptr++=z;
z=(int) *inptr +er*5/16;//down
if(z<0) z=0; else if(z>255) z=255;
*inptr++=z;
z=(int) *inptr +er*1/16; //down & right
if(z<0) z=0; else if(z>255) z=255;
*inptr=z;
}//x
}///y
monopalette (0,255);
dispimage(0, 12, xpixels, ypixels, (img_mono | img_revscan), cambuffer+bufstart);
break;
default: effect = 0;
}//switch effect
cam_grabenable(camen_grab, bufstart - 1, 0); // buffer swap for new frame
break;
case s_quit:
cam_grabdisable();
return ("");
break;
}
return (0);
}