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xvalg.c
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/*
* xvalg.c - image manipulation algorithms (Blur, etc.)
*
* Contains:
* void AlgInit();
* void DoAlg(int algnum);
*/
#include "copyright.h"
#include "xv.h"
#ifndef M_PI
# define M_PI (3.1415926535897932385)
#endif
static void NoAlg PARM((void));
static void Blur PARM((void));
static void Sharpen PARM((void));
static void EdgeDetect PARM((void));
static void TinFoil PARM((void));
static void OilPaint PARM((void));
static void Blend PARM((void));
static void FineRotate PARM((int));
static void Pixelize PARM((void));
static void Spread PARM((void));
static void MedianFilter PARM((void));
static void saveOrigPic PARM((void));
static void doBlurConvolv PARM((byte *,int,int,byte *, int,int,int,int, int));
static void doSharpConvolv PARM((byte *,int,int,byte *, int,int,int,int, int));
static void doEdgeConvolv PARM((byte *,int,int,byte *, int,int,int,int));
static void doAngleConvolv PARM((byte *,int,int,byte *, int,int,int,int));
static void doOilPaint PARM((byte *,int,int,byte *, int,int,int,int, int));
static void doBlend PARM((byte *,int,int,byte *, int,int,int,int));
static void doRotate PARM((byte *,int,int,byte *, int,int,int,int,
double, int));
static void doPixel PARM((byte *,int,int,byte *, int,int,int,int,
int, int));
static void doSpread PARM((byte *,int,int,byte *, int,int,int,int,
int, int));
static void doMedianFilter PARM((byte *,int,int,byte *, int,int,int,int, int));
static void add2bb PARM((int *, int *, int *, int *, int, int));
static void rotXfer PARM((int, int, double *,double *,
double,double, double));
#ifdef FOO
static void intsort PARM((int *, int));
#endif
static int start24bitAlg PARM((byte **, byte **));
static void end24bitAlg PARM((byte *, byte *));
static void printUTime PARM((const char *));
static byte *origPic = (byte *) NULL;
static int origPicType;
static byte origrmap[256], origgmap[256], origbmap[256];
#undef TIMING_TEST
#ifdef TIMING_TEST
#include <sys/time.h>
#include <sys/resource.h>
#endif
/***************************/
static void printUTime(str)
const char *str;
{
#ifdef TIMING_TEST
int i;
struct rusage ru;
i = getrusage(RUSAGE_SELF, &ru);
fprintf(stderr,"%s: utime = %d.%d seconds\n",
str, ru.ru_utime.tv_sec, ru.ru_utime.tv_usec);
#endif
}
/************************************************************/
void AlgInit()
{
/* called whenver an image file is loaded. disposes of origPic
if neccessary, and points it to null */
if (origPic) free(origPic);
origPic = (byte *) NULL;
algMB.dim[ALG_NONE] = 1; /* can't undo when init'ed already */
}
/************************/
void DoAlg(anum)
int anum;
{
/* called with a value from the algMB button. Executes the specified
algorithm */
switch (anum) {
case ALG_NONE: NoAlg(); break;
case ALG_BLUR: Blur(); break;
case ALG_SHARPEN: Sharpen(); break;
case ALG_EDGE: EdgeDetect(); break;
case ALG_TINF: TinFoil(); break;
case ALG_OIL: OilPaint(); break;
case ALG_BLEND: Blend(); break;
case ALG_ROTATE: FineRotate(0); break;
case ALG_ROTATECLR: FineRotate(1); break;
case ALG_PIXEL: Pixelize(); break;
case ALG_SPREAD: Spread(); break;
case ALG_MEDIAN: MedianFilter(); break;
}
algMB.dim[ALG_NONE] = (origPic == (byte *) NULL);
}
/************************/
static void NoAlg()
{
int i;
/* restore original picture */
if (!origPic) return; /* none to restore */
WaitCursor();
KillOldPics(); /* toss the old pic/cpic/epic/theImage away */
picType = origPicType;
Set824Menus(picType);
pic = origPic; origPic = NULL;
if (picType == PIC8) {
for (i=0; i<256; i++) {
rMap[i] = origrmap[i];
gMap[i] = origgmap[i];
bMap[i] = origbmap[i];
}
}
InstallNewPic();
}
/************************/
static void Blur()
{
/* runs a n*n convolution mask (all 1's) over 'pic',
producing a 24-bit version. Then calls 24to8 to generate a new 8-bit
image, and installs it.
Note that 'n' must be odd for things to work properly */
byte *pic24, *tmpPic;
int i, sx,sy,sw,sh, n;
static const char *labels[] = { "\nOk", "\033Cancel" };
char txt[256];
static char buf[64] = { '3', '\0' };
sprintf(txt, "Blur: \n\n%s",
"Enter mask size (ex. 3, 5, 7, ...)");
i = GetStrPopUp(txt, labels, 2, buf, 64, "0123456789", 1);
if (i==1 || strlen(buf)==0) return;
n = atoi(buf);
if (n < 1 || (n&1)!=1) {
ErrPopUp("Error: The value entered must be odd and greater than zero.",
"\nOh!");
return;
}
WaitCursor();
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
SetISTR(ISTR_INFO, "Blurring %s with %dx%d convolution mask...",
(HaveSelection() ? "selection" : "image"), n,n);
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doBlurConvolv(pic24, pWIDE,pHIGH, tmpPic, sx,sy,sw,sh, n);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void Sharpen()
{
/* runs an edge-enhancment algorithm */
byte *pic24, *tmpPic;
int i, sx,sy,sw,sh, n;
static const char *labels[] = { "\nOk", "\033Cancel" };
char txt[256];
static char buf[64] = { '7', '5', '\0' };
sprintf(txt, "Sharpen: \n\n%s",
"Enter enhancement factor (0-99%)");
i = GetStrPopUp(txt, labels, 2, buf, 64, "0123456789", 1);
if (i==1 || strlen(buf)==0) return;
n = atoi(buf);
if (n>=100) {
ErrPopUp("Error: The value entered must be less than 100%.", "\nOh!");
return;
}
WaitCursor();
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
SetISTR(ISTR_INFO, "Sharpening %s by factor of %d%%...",
(HaveSelection() ? "selection" : "image"), n);
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doSharpConvolv(pic24, pWIDE,pHIGH, tmpPic, sx,sy,sw,sh, n);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void EdgeDetect()
{
byte *pic24, *p24, *tmpPic, *tlp;
const char *str;
int i, j, v, maxv, sx,sy,sw,sh;
WaitCursor();
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
str = "Doing edge detection...";
SetISTR(ISTR_INFO, str);
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doEdgeConvolv(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh);
SetISTR(ISTR_INFO, "%snormalizing...", str);
/* Normalize results */
for (i=sy, maxv=0; i<sy+sh; i++) { /* compute max value */
p24 = tmpPic + (i*pWIDE + sx) * 3;
for (j=sx; j<sx+sw; j++, p24+=3) {
v = MONO(p24[0], p24[1], p24[2]);
if (v>maxv) maxv = v;
}
}
for (i=sy; maxv>0 && i<sy+sh; i++) { /* normalize */
p24 = tlp = tmpPic + (i*pWIDE + sx) * 3;
for (j=0; j<sw*3; j++) {
v = (((int) *p24) * 255) / maxv;
RANGE(v,0,255);
*p24++ = (byte) v;
}
}
end24bitAlg(pic24, tmpPic);
}
/************************/
static void TinFoil()
{
byte *pic24, *tmpPic, *tp, *tlp;
const char *str;
int i, j, v, sx,sy,sw,sh;
WaitCursor();
str = "Doing cheesy embossing effect...";
SetISTR(ISTR_INFO, str);
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
/* fill selected area of tmpPic with gray128 */
for (i=sy; i<sy+sh; i++) {
tp = tlp = tmpPic + (i*pWIDE + sx) * 3;
for (j=sx; j<sx+sw; j++) {
*tp++ = 128; *tp++ = 128; *tp++ = 128;
}
}
doAngleConvolv(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh);
/* mono-ify selected area of tmpPic */
for (i=sy; i<sy+sh; i++) {
tp = tlp = tmpPic + (i*pWIDE + sx) * 3;
for (j=sx; j<sx+sw; j++, tp+=3) {
v = MONO(tp[0], tp[1], tp[2]);
RANGE(v,0,255);
tp[0] = tp[1] = tp[2] = (byte) v;
}
}
end24bitAlg(pic24, tmpPic);
}
/************************/
static void OilPaint()
{
byte *pic24, *tmpPic;
int sx,sy,sw,sh;
WaitCursor();
SetISTR(ISTR_INFO, "Doing oilpaint effect...");
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doOilPaint(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh, 3);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void Blend()
{
byte *pic24, *tmpPic;
int sx,sy,sw,sh;
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
WaitCursor();
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doBlend(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void FineRotate(clr)
int clr;
{
byte *pic24, *tmpPic;
int i,sx,sy,sw,sh;
double rotval;
static const char *labels[] = { "\nOk", "\033Cancel" };
char txt[256];
static char buf[64] = { '\0' };
sprintf(txt, "Rotate (%s):\n\nEnter rotation angle, in degrees: (>0 = CCW)",
(clr ? "Clear" : "Copy"));
i = GetStrPopUp(txt, labels, 2, buf, 64, "0123456789.-", 1);
if (i==1 || strlen(buf)==0) return;
rotval = atof(buf);
if (rotval == 0.0) return;
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
WaitCursor();
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doRotate(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh, rotval, clr);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void Pixelize()
{
byte *pic24, *tmpPic;
int i,sx,sy,sw,sh, pixX,pixY,err;
static const char *labels[] = { "\nOk", "\033Cancel" };
char txt[256];
static char buf[64] = { '4', '\0' };
sprintf(txt, "Pixelize:\n\nEnter new pixel size, in image pixels: %s",
"(ex. '3', '5x8')");
i = GetStrPopUp(txt, labels, 2, buf, 64, "0123456789x", 1);
if (i==1 || strlen(buf)==0) return;
pixX = pixY = err = 0;
if (index(buf, 'x')) {
if (sscanf(buf, "%d x %d", &pixX, &pixY) != 2) err++;
}
else {
if (sscanf(buf, "%d", &pixX) != 1) err++;
pixY = pixX;
}
if (pixX<1 || pixY<1 || err) {
ErrPopUp("Error: The entered string is not valid.", "\nWho Cares!");
return;
}
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
WaitCursor();
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doPixel(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh, pixX, pixY);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void Spread()
{
byte *pic24, *tmpPic;
int i,sx,sy,sw,sh, pixX,pixY,err;
static const char *labels[] = { "\nOk", "\033Cancel" };
char txt[256];
static char buf[64] = { '5', '\0' };
sprintf(txt, "Spread:\n\nEnter spread factor (or x,y factors): %s",
"(ex. '10', '1x5')");
i = GetStrPopUp(txt, labels, 2, buf, 64, "0123456789x", 1);
if (i==1 || strlen(buf)==0) return;
pixX = pixY = err = 0;
if (index(buf, 'x')) {
if (sscanf(buf, "%d x %d", &pixX, &pixY) != 2) err++;
if (pixX<0 || pixY<0) err++;
}
else {
if (sscanf(buf, "%d", &pixX) != 1) err++;
pixX = -pixX;
}
if (!pixX && !pixY) return; /* 0x0 has no effect */
if (err) {
ErrPopUp("Error: The entered string is not valid.", "\nBite Me!");
return;
}
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
WaitCursor();
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doSpread(pic24, pWIDE, pHIGH, tmpPic, sx,sy,sw,sh, pixX, pixY);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void MedianFilter()
{
/* runs median filter algorithm (for n*n rect centered around each pixel,
replace with median value */
byte *pic24, *tmpPic;
int i, sx,sy,sw,sh, n;
static const char *labels[] = { "\nOk", "\033Cancel" };
char txt[256];
static char buf[64] = { '3', '\0' };
sprintf(txt, "DeSpeckle (median filter): \n\n%s",
"Enter mask size (ex. 3, 5, 7, ...)");
i = GetStrPopUp(txt, labels, 2, buf, 64, "0123456789", 1);
if (i==1 || strlen(buf)==0) return;
n = atoi(buf);
if (n < 1 || (n&1)!=1) {
ErrPopUp("Error: The value entered must be odd and greater than zero.",
"\nOh!");
return;
}
WaitCursor();
if (HaveSelection()) GetSelRCoords(&sx,&sy,&sw,&sh);
else { sx = 0; sy = 0; sw = pWIDE; sh = pHIGH; }
CropRect2Rect(&sx,&sy,&sw,&sh, 0,0,pWIDE,pHIGH);
SetISTR(ISTR_INFO, "DeSpeckling %s with %dx%d convolution mask...",
(HaveSelection() ? "selection" : "image"), n,n);
if (start24bitAlg(&pic24, &tmpPic)) return;
xvbcopy((char *) pic24, (char *) tmpPic, (size_t) (pWIDE*pHIGH*3));
doMedianFilter(pic24, pWIDE,pHIGH, tmpPic, sx,sy,sw,sh, n);
end24bitAlg(pic24, tmpPic);
}
/************************/
static void doBlurConvolv(pic24, w, h, results, selx,sely,selw,selh, n)
byte *pic24, *results;
int w,h, selx,sely,selw,selh, n;
{
/* convolves with an n*n array, consisting of only 1's.
Operates on rectangular region 'selx,sely,selw,selh' (in pic coords)
Region is guaranteed to be completely within pic boundaries
'n' must be odd */
register byte *p24;
register int rsum,gsum,bsum;
byte *rp;
int x,y,x1,y1,count,n2;
printUTime("start of blurConvolv");
n2 = n/2;
for (y=sely; y<sely+selh; y++) {
ProgressMeter(sely, (sely+selh)-1, y, "Blur");
if ((y & 15) == 0) WaitCursor();
p24 = pic24 + y*w*3 + selx*3;
rp = results + y*w*3 + selx*3;
for (x=selx; x<selx+selw; x++) {
rsum = gsum = bsum = 0; count = 0;
for (y1=y-n2; y1<=y+n2; y1++) {
if (y1>=sely && y1<sely+selh) {
p24 = pic24 + y1*w*3 +(x-n2)*3;
for (x1=x-n2; x1<=x+n2; x1++) {
if (x1>=selx && x1<selx+selw) {
rsum += *p24++;
gsum += *p24++;
bsum += *p24++;
count++;
}
else p24 += 3;
}
}
}
rsum = rsum / count;
gsum = gsum / count;
bsum = bsum / count;
RANGE(rsum,0,255);
RANGE(gsum,0,255);
RANGE(bsum,0,255);
*rp++ = (byte) rsum;
*rp++ = (byte) gsum;
*rp++ = (byte) bsum;
}
}
printUTime("end of blurConvolv");
}
/************************/
static void doSharpConvolv(pic24, w, h, results, selx,sely,selw,selh, n)
byte *pic24, *results;
int w,h, selx,sely,selw,selh, n;
{
byte *p24;
int rv, gv, bv;
byte *rp;
int i,x,y;
double fact, ifact, hue,sat,val, vsum;
double *linem1, *line0, *linep1, *tmpptr;
printUTime("start of sharpConvolv");
fact = n / 100.0;
ifact = 1.0 - fact;
if (selw<3 || selh<3) return; /* too small */
linem1 = (double *) malloc(selw * sizeof(double));
line0 = (double *) malloc(selw * sizeof(double));
linep1 = (double *) malloc(selw * sizeof(double));
if (!linem1 || !line0 || !linep1) {
ErrPopUp("Malloc() error in doSharpConvov().", "\nDoh!");
if (linem1) free(linem1);
if (line0) free(line0);
if (linep1) free(linep1);
return;
}
/* load up line arrays */
p24 = pic24 + (((sely+1)-1)*w + selx) * 3;
for (x=selx, tmpptr=line0; x<selx+selw; x++, p24+=3, tmpptr++) {
rgb2hsv((int) p24[0], (int) p24[1], (int) p24[2], &hue,&sat,&val);
*tmpptr = val;
}
p24 = pic24 + (((sely+1)+0)*w + selx) * 3;
for (x=selx, tmpptr=linep1; x<selx+selw; x++, p24+=3, tmpptr++) {
rgb2hsv((int) p24[0], (int) p24[1], (int) p24[2], &hue,&sat,&val);
*tmpptr = val;
}
for (y=sely+1; y<(sely+selh)-1; y++) {
ProgressMeter(sely+1, (sely+selh)-2, y, "Sharpen");
if ((y & 15) == 0) WaitCursor();
tmpptr = linem1; linem1 = line0; line0 = linep1; linep1 = tmpptr;
/* get next line */
p24 = pic24 + ((y+1)*w + selx) * 3;
for (x=selx, tmpptr=linep1; x<selx+selw; x++, p24+=3, tmpptr++) {
rgb2hsv((int) p24[0], (int) p24[1], (int) p24[2], &hue,&sat,&val);
*tmpptr = val;
}
p24 = pic24 + (y*w + selx+1) * 3;
rp = results + (y*w + selx+1) * 3;
for (x=selx+1; x<selx+selw-1; x++, p24+=3) {
vsum = 0.0; i = x-selx;
vsum = linem1[i-1] + linem1[i] + linem1[i+1] +
line0 [i-1] + line0 [i] + line0 [i+1] +
linep1[i-1] + linep1[i] + linep1[i+1];
rgb2hsv((int) p24[0], (int) p24[1], (int) p24[2], &hue, &sat, &val);
val = ((val - (fact * vsum) / 9) / ifact);
RANGE(val, 0.0, 1.0);
hsv2rgb(hue,sat,val, &rv, &gv, &bv);
RANGE(rv,0,255);
RANGE(gv,0,255);
RANGE(bv,0,255);
*rp++ = (byte) rv;
*rp++ = (byte) gv;
*rp++ = (byte) bv;
}
}
free(linem1); free(line0); free(linep1);
printUTime("end of sharpConvolv");
}
/************************/
static void doEdgeConvolv(pic24, w, h, results, selx,sely,selw,selh)
byte *pic24, *results;
int w, h, selx,sely,selw,selh;
{
/* convolves with two edge detection masks (vertical and horizontal)
simultaneously, taking Max(abs(results))
The two masks are (hard coded):
-1 0 1 -1 -1 -1
H = -1 0 1 and V = 0 0 0
-1 0 1 1 1 1
divided into
-1 0 0 0 0 0 0 0 1 0 1 0
a = 0 0 0 , b = -1 0 1 , c = 0 0 0 , d = 0 0 0 .
0 0 1 0 0 0 -1 0 0 0 -1 0
So H = a + b + c, V = a - c - d.
gradient = max(abs(H),abs(V)).
Also, only does pixels in which the masks fit fully onto the picture
(no pesky boundary conditionals) */
register byte *p24;
register int bperlin, a, b, c, d, rsum, gsum, bsum;
byte *rp;
int x, y;
printUTime("start of edgeConvolv");
bperlin = w * 3;
for (y=sely+1; y<sely+selh-1; y++) {
ProgressMeter(sely+1, (sely+selh-1)-1, y, "Edge Detect");
if ((y & 63) == 0) WaitCursor();
rp = results + (y*w + selx+1)*3;
p24 = pic24 + (y*w + selx+1)*3;
for (x=selx+1; x<selx+selw-1; x++, p24+=3) {
/* RED PLANE */
a = p24[bperlin+3] - p24[-bperlin-3]; /* bottom right - top left */
b = p24[3] - p24[-3]; /* mid right - mid left */
c = p24[-bperlin+3] - p24[bperlin-3]; /* top right - bottom left */
d = p24[-bperlin] - p24[bperlin]; /* top mid - bottom mid */
rsum = a + b + c; /* horizontal gradient */
if (rsum < 0) rsum = -rsum;
a = a - c - d; /* vertical gradient */
if (a < 0) a = -a;
if (a > rsum) rsum = a;
rsum /= 3;
/* GREEN PLANE */
a = p24[bperlin+4] - p24[-bperlin-2]; /* bottom right - top left */
b = p24[4] - p24[-2]; /* mid right - mid left */
c = p24[-bperlin+4] - p24[bperlin-2]; /* top right - bottom left */
d = p24[-bperlin+1] - p24[bperlin+1]; /* top mid - bottom mid */
gsum = a + b + c; /* horizontal gradient */
if (gsum < 0) gsum = -gsum;
a = a - c - d; /* vertical gradient */
if (a < 0) a = -a;
if (a > gsum) gsum = a;
gsum /= 3;
/* BLUE PLANE */
a = p24[bperlin+5] - p24[-bperlin-1]; /* bottom right - top left */
b = p24[5] - p24[-1]; /* mid right - mid left */
c = p24[-bperlin+5] - p24[bperlin-1]; /* top right - bottom left */
d = p24[-bperlin+2] - p24[bperlin+2]; /* top mid - bottom mid */
bsum = a + b + c; /* horizontal gradient */
if (bsum < 0) bsum = -bsum;
a = a - c - d; /* vertical gradient */
if (a < 0) a = -a;
if (a > bsum) bsum = a;
bsum /= 3;
*rp++ = (byte) rsum;
*rp++ = (byte) gsum;
*rp++ = (byte) bsum;
}
}
printUTime("end of edgeConvolv");
}
/************************/
static void doAngleConvolv(pic24, w, h, results, selx,sely,selw,selh)
byte *pic24, *results;
int w, h, selx,sely,selw,selh;
{
/* convolves with edge detection mask, at 45 degrees to horizontal.
The mask is (hard coded):
-2 -1 0
-1 0 1
0 1 2
Also, only does pixels in which the masks fit fully onto the picture
(no pesky boundary conditionals)
Adds value of rsum,gsum,bsum to results pic */
register byte *p24;
register int bperlin,rsum,gsum,bsum;
byte *rp;
int x,y;
printUTime("start of doAngleConvolv");
bperlin = w * 3;
for (y=sely+1; y<sely+selh-1; y++) {
ProgressMeter(sely+1, (sely+selh-1)-1, y, "Convolve");
if ((y & 63) == 0) WaitCursor();
rp = results + (y*w + selx+1)*3;
p24 = pic24 + (y*w + selx+1)*3;
for (x=selx+1; x<selx+selw-1; x++, p24+=3) {
/* compute weighted average for *p24 (pic24[x,y]) */
rsum = gsum = bsum = 0;
rsum -= (p24[-bperlin-3] * 2); /* top left */
gsum -= (p24[-bperlin-2] * 2);
bsum -= (p24[-bperlin-1] * 2);
rsum -= p24[-bperlin]; /* top mid */
gsum -= p24[-bperlin+1];
bsum -= p24[-bperlin+2];
rsum -= p24[-3]; /* mid left */
gsum -= p24[-2];
bsum -= p24[-1];
rsum += p24[3]; /* mid right */
gsum += p24[4];
bsum += p24[5];
rsum += p24[bperlin]; /* bottom mid */
gsum += p24[bperlin+1];
bsum += p24[bperlin+2];
rsum += (p24[bperlin+3] * 2); /* bottom right */
gsum += (p24[bperlin+4] * 2);
bsum += (p24[bperlin+5] * 2);
rsum = rsum / 8;
gsum = gsum / 8;
bsum = bsum / 8;
rsum += rp[0]; RANGE(rsum,0,255);
gsum += rp[1]; RANGE(gsum,0,255);
bsum += rp[2]; RANGE(bsum,0,255);
*rp++ = (byte) rsum;
*rp++ = (byte) gsum;
*rp++ = (byte) bsum;
}
}
printUTime("end of edgeConvolv");
}
/************************/
static void doOilPaint(pic24, w, h, results, selx,sely,selw,selh, n)
byte *pic24, *results;
int w, h, selx,sely,selw,selh, n;
{
/* does an 'oil transfer', as described in the book "Beyond Photography",
by Holzmann, chapter 4, photo 7. It is a sort of localized smearing.
The following algorithm (but no actual code) was borrowed from
'pgmoil.c', written by Wilson Bent ([email protected]),
and distributed as part of the PBMPLUS package.
for each pixel in the image (assume, for a second, a grayscale image),
compute a histogram of the n*n rectangle centered on the pixel.
replace the pixel with the color that had the greatest # of hits in
the histogram. Note that 'n' should be odd.
I've modified the algorithm to do the *right* thing for RGB images.
(jhb, 6/94) */
register byte *pp;
register int bperlin;
byte *rp, *p24, *plin;
int i,j,k,x,y,n2,col,cnt,maxcnt;
int *nnrect;
printUTime("start of doOilPaint");
if (n & 1) n++; /* n must be odd */
bperlin = w * 3;
n2 = n/2;
/* nnrect[] is an n*n array of ints, with '-1' meaning 'outside the region'
otherwise they'll have 24-bit RGB values */
nnrect = (int *) malloc(n * n * sizeof(int));
if (!nnrect) FatalError("can't malloc nnrect[] in doOilPaint()\n");
for (y=sely; y<sely+selh; y++) {
if ((y & 15) == 0) WaitCursor();
ProgressMeter(sely, (sely+selh)-1, y, "Oil Paint");
p24 = pic24 + ((y-n2)*w + selx-n2)*3; /* pts to top-left of mask */
rp = results + (y*w + selx)*3;
for (x=selx; x<selx+selw; x++) {
/* fill 'nnrect' with valid pixels from n*n region centered round x,y */
pp = plin = p24;
for (i=y-n2, k=0; i<y+n2; i++) {
for (j=x-n2; j<x+n2; j++, k++, pp+=3) {
if (i>=sely && i<sely+selh && j>=selx && j<selx+selw) {
nnrect[k] = (((int) pp[0])<<16) | (((int) pp[1])<<8) | pp[2];
}
else nnrect[k] = -1;
}
plin += bperlin; pp = plin;
}
/* find 'most popular color' in nnrect, not counting '-1' */
maxcnt = cnt = col = 0;
for (i=0; i<n*n; i++) {
if (nnrect[i] != -1) {
cnt = 1;
for (j=i+1; j<n*n; j++) { /* count it */
if (nnrect[i] == nnrect[j]) cnt++;
}
if (cnt>maxcnt) { col = nnrect[i]; maxcnt = cnt; }
}
}
*rp++ = (byte) ((col>>16) & 0xff);
*rp++ = (byte) ((col>>8) & 0xff);
*rp++ = (byte) ((col) & 0xff);
p24 += 3;
}
}
free(nnrect);
printUTime("end of doOilPaint");
}
/************************/
static void doBlend(pic24, w, h, results, selx,sely,selw,selh)
byte *pic24, *results;
int w, h, selx,sely,selw,selh;
{
/* 'blends' a rectangular region out of existence. computes the average
color of all the pixels on the edge of the rect, stores this in the
center, and for each pixel in the rect, replaces it with a weighted
average of the center color, and the color on the edge that intersects
a line drawn from the center to the point */
byte *p24;
int i,x,y;
int cx,cy,cR,cG,cB;