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gimp/plug-ins/rcm/rcm_misc.c

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/*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This is a plug-in for the GIMP.
*
* Colormap-Rotation plug-in. Exchanges two color ranges.
*
* Copyright (C) 1999 Sven Anders (anderss@fmi.uni-passau.de)
* Based on code from Pavel Grinfeld (pavel@ml.com)
*
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*-----------------------------------------------------------------------------------
* Change log:
*
* Version 2.0, 04 April 1999.
* Nearly complete rewrite, made plug-in stable.
* (Works with GIMP 1.1 and GTK+ 1.2)
*
* Version 1.0, 27 March 1997.
* Initial (unstable) release by Pavel Grinfeld
*
*-----------------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include "rcm.h"
#include "rcm_misc.h"
#include "rcm_gdk.h"
/*-----------------------------------------------------------------------------------*/
float arctg(float y, float x)
{
float temp = atan2(y,x);
return (temp<0) ? (temp+TP) : temp;
}
inline float sign(float x)
{
return (x<0)?(-1):(1);
}
/*-----------------------------------------------------------------------------------*/
float min_prox(float alpha, float beta, float angle)
{
gfloat temp1 = MIN(angle_mod_2PI(alpha - angle),
TP-angle_mod_2PI(alpha - angle));
gfloat temp2 = MIN(angle_mod_2PI(beta - angle),
TP-angle_mod_2PI(beta - angle));
return MIN(temp1, temp2);
}
float *closest(float *alpha, float *beta, float angle)
{
float temp_alpha = MIN(angle_mod_2PI(*alpha-angle),
TP-angle_mod_2PI(*alpha-angle));
float temp_beta = MIN(angle_mod_2PI(*beta -angle),
TP-angle_mod_2PI(*beta -angle));
if (temp_alpha-temp_beta<0)
return alpha;
else
return beta;
}
float angle_mod_2PI(float angle)
{
if (angle < 0)
return angle + TP;
else if (angle > TP)
return angle - TP;
else
return angle;
}
/*-----------------------------------------------------------------------------------*/
/* supporting routines */
/*-----------------------------------------------------------------------------------*/
float rcm_linear(float A, float B, float C, float D, float x)
{
if (B > A)
if (A<=x && x<=B)
return C+(D-C)/(B-A)*(x-A);
else if (A<=x+TP && x+TP<=B)
return C+(D-C)/(B-A)*(x+TP-A);
else
return x;
else
if (B<=x && x<=A)
return C+(D-C)/(B-A)*(x-A);
else if (B<=x+TP && x+TP<=A)
return C+(D-C)/(B-A)*(x+TP-A);
else
return x;
}
float rcm_left_end(RcmAngle *angle)
{
gfloat alpha = angle->alpha;
gfloat beta = angle->beta;
gint cw_ccw = angle->cw_ccw;
switch (cw_ccw)
{
case (-1): if (alpha < beta) return alpha + TP;
default: return alpha; /* 1 */
}
}
float rcm_right_end(RcmAngle *angle)
{
gfloat alpha = angle->alpha;
gfloat beta = angle->beta;
gint cw_ccw = angle->cw_ccw;
switch (cw_ccw)
{
case 1: if (beta < alpha) return beta + TP;
default: return beta; /* -1 */
}
}
float rcm_angle_inside_slice(float angle, RcmAngle *slice)
{
return angle_mod_2PI(slice->cw_ccw * (slice->beta-angle)) /
angle_mod_2PI(slice->cw_ccw * (slice->beta-slice->alpha));
}
gint rcm_is_gray(float s)
{
if (s <= Current.Gray->gray_sat) return 1;
return 0;
}
/*-----------------------------------------------------------------------------------*/
/* reduce image/selection for preview */
/*-----------------------------------------------------------------------------------*/
ReducedImage *rcm_reduce_image(GDrawable *drawable, GDrawable *mask, gint LongerSize, gint Slctn)
{
GPixelRgn srcPR, srcMask;
ReducedImage *temp;
guchar *tempRGB, *src_row, *tempmask, *src_mask_row;
gint i, j, whichcol, whichrow, x1, x2, y1, y2;
gint RH, RW, width, height, bytes;
gint NoSelectionMade;
hsv *tempHSV, H, S, V;
guchar R, G ,B;
bytes = drawable->bpp;
temp = g_new(ReducedImage, 1);
/* get bounds of image or selection */
gimp_drawable_mask_bounds(drawable->id, &x1, &y1, &x2, &y2);
if ( ((x2-x1) != drawable->width) && ((y2-y1) != drawable->height))
NoSelectionMade = FALSE;
else
NoSelectionMade = TRUE;
switch (Slctn)
{
case ENTIRE_IMAGE:
x1 = 0;
x2 = drawable->width;
y1 = 0;
y2 = drawable->height;
break;
case SELECTION_IN_CONTEXT:
x1 = MAX(0, x1 - (x2-x1) / 2.0);
x2 = MIN(drawable->width, x2 + (x2-x1) / 2.0);
y1 = MAX(0, y1 - (y2-y1) / 2.0);
y2 = MIN(drawable->height, y2 + (y2-y1) / 2.0);
break;
default:
break; /* take selection dimensions */
}
/* calculate size of preview */
width = x2 - x1;
height = y2 - y1;
if (width > height)
{
RW = LongerSize;
RH = (float) height * (float) LongerSize / (float) width;
}
else
{
RH = LongerSize;
RW = (float)width * (float) LongerSize / (float) height;
}
/* allocate memory */
tempRGB = (guchar *) malloc(RW * RH * bytes);
tempHSV = (hsv *) malloc(RW * RH * bytes * sizeof(hsv));
tempmask = (guchar *) malloc(RW * RH);
gimp_pixel_rgn_init(&srcPR, drawable, x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init(&srcMask, mask, x1, y1, width, height, FALSE, FALSE);
src_row = (guchar *) malloc(width * bytes);
src_mask_row = (guchar *) malloc(width * bytes);
/* reduce image */
for (i=0; i<RH; i++)
{
whichrow = (float)i * (float)height / (float)RH;
gimp_pixel_rgn_get_row (&srcPR, src_row, x1, y1+whichrow, width);
gimp_pixel_rgn_get_row (&srcMask, src_mask_row, x1, y1+whichrow, width);
for (j=0; j<RW; j++)
{
whichcol = (float)j * (float)width / (float)RW;
if (NoSelectionMade)
tempmask[i*RW+j] = 255;
else
tempmask[i*RW+j] = src_mask_row[whichcol];
R = src_row[whichcol*bytes+0];
G = src_row[whichcol*bytes+1];
B = src_row[whichcol*bytes+2];
rgb_to_hsv(R/255.0, G/255.0, B/255.0, &H, &S, &V);
tempRGB[i*RW*bytes+j*bytes+0] = R;
tempRGB[i*RW*bytes+j*bytes+1] = G;
tempRGB[i*RW*bytes+j*bytes+2] = B;
tempHSV[i*RW*bytes+j*bytes+0] = H;
tempHSV[i*RW*bytes+j*bytes+1] = S;
tempHSV[i*RW*bytes+j*bytes+2] = V;
if (bytes == 4)
tempRGB[i*RW*bytes+j*bytes+3] = src_row[whichcol*bytes+3];
} /* for j */
} /* for i */
/* return values */
temp->width = RW;
temp->height = RH;
temp->rgb = tempRGB;
temp->hsv = tempHSV;
temp->mask = tempmask;
return temp;
}
/*-----------------------------------------------------------------------------------*/
/* render before/after preview */
/*-----------------------------------------------------------------------------------*/
static gint rcm_fake_transparency(gint i, gint j)
{
if ( ((i%20)-10)*((j%20)-10) > 0 ) return 102;
return 153;
}
void rcm_render_preview(GtkWidget *preview, gint version)
{
ReducedImage *reduced;
gint RW, RH, bytes, i, j, k, unchanged, skip;
guchar *rgb_array, *a;
hsv H, S, V, R, G, B;
hsv *hsv_array;
float degree, transp;
/* init some variables */
reduced = Current.reduced;
RW = reduced->width;
RH = reduced->height;
bytes = Current.drawable->bpp;
hsv_array = reduced->hsv;
rgb_array = reduced->rgb;
a = (guchar *) malloc(bytes * RW);
if (preview == NULL)
{
printf("Asked to preview a NULL! Shouldn't happen!\n");
return;
}
if (version == CURRENT)
{
for (i=0; i<RH; i++)
{
for (j=0; j<RW; j++)
{
unchanged = 1; /* TRUE */
skip = 0; /* FALSE */
H = hsv_array[i*RW*bytes + j*bytes + 0];
S = hsv_array[i*RW*bytes + j*bytes + 1];
V = hsv_array[i*RW*bytes + j*bytes + 2];
if (rcm_is_gray(S) && (reduced->mask[i*RW+j] != 0))
{
switch (Current.Gray_to_from)
{
case GRAY_FROM:
if (rcm_angle_inside_slice(Current.Gray->hue, Current.From->angle) <= 1)
{
H = Current.Gray->hue/TP;
S = Current.Gray->satur;
}
else
skip = 1;
break;
case GRAY_TO:
unchanged = 0;
skip = 1;
hsv_to_rgb(Current.Gray->hue/TP, Current.Gray->satur, V, &R,&G,&B);
break;
default: break;
} /* switch */
} /* if */
if (!skip)
{
unchanged = 0;
H = rcm_linear(rcm_left_end(Current.From->angle),
rcm_right_end(Current.From->angle),
rcm_left_end(Current.To->angle),
rcm_right_end(Current.To->angle),
H*TP);
H = angle_mod_2PI(H) / TP;
hsv_to_rgb(H,S,V, &R,&G,&B);
} /* if (!skip) */
if (unchanged)
degree = 0;
else
degree = reduced->mask[i*RW+j] / 255.0;
a[j*3+0] = (1-degree) * rgb_array[i*RW*bytes + j*bytes + 0] + degree * R * 255;
a[j*3+1] = (1-degree) * rgb_array[i*RW*bytes + j*bytes + 1] + degree * G * 255;
a[j*3+2] = (1-degree) * rgb_array[i*RW*bytes + j*bytes + 2] + degree * B * 255;
/* apply transparency */
if (bytes == 4)
{
for (k=0; k<3; k++)
{
/* transp = reduced->mask[i*RW*bytes+j*bytes+3] / 255.0; */
transp = rgb_array[i*RW*bytes+j*bytes+3] / 255.0;
a[3*j+k] = transp * a[3*j+k] + (1-transp) * rcm_fake_transparency(i,j);
}
} /* if */
} /* for j */
gtk_preview_draw_row(GTK_PREVIEW(preview), a, 0, i, RW);
} /* for i */
}
else /* ORIGINAL */
{
for (i=0; i<RH; i++)
{
for (j=0; j<RW; j++)
{
a[j*3+0] = rgb_array[i*RW*bytes + j*bytes + 0];
a[j*3+1] = rgb_array[i*RW*bytes + j*bytes + 1];
a[j*3+2] = rgb_array[i*RW*bytes + j*bytes + 2];
if (bytes == 4)
{
for (k=0; k<3; k++)
{
transp = rgb_array[i*RW*bytes+j*bytes+3] / 255.0;
a[3*j+k] = transp * a[3*j+k] + (1-transp) * rcm_fake_transparency(i,j);
}
} /* if */
} /* for j */
gtk_preview_draw_row(GTK_PREVIEW(preview), a, 0, i, RW);
} /* for i */
}
free(a);
gtk_widget_draw(preview, NULL);
gdk_flush();
}
/*-----------------------------------------------------------------------------------*/
/* render circle */
/*-----------------------------------------------------------------------------------*/
void rcm_render_circle(GtkWidget *preview, int sum, int margin)
{
gint i, j;
hsv h, s, v, r, g, b;
guchar *a;
a = (guchar *) malloc(3*sum);
if (preview == NULL) return;
for (j=0; j<sum; j++)
{
for (i=0; i<sum; i++)
{
s = sqrt((sqr(i-sum/2.0) + sqr(j-sum/2.0)) / (float)sqr(sum/2.0-margin));
if (s > 1)
{
a[i*3+0] = 255;
a[i*3+1] = 255;
a[i*3+2] = 255;
}
else
{
h = arctg(sum/2.0-j, i-sum/2.0)/(2*PI);
v = 1-sqrt(s)/2;
hsv_to_rgb(h,s,v, &r, &g, &b);
a[i*3+0] = r*255;
a[i*3+1] = g*255;
a[i*3+2] = b*255;
}
}
gtk_preview_draw_row(GTK_PREVIEW(preview), a, 0, j, sum);
}
free(a);
gtk_widget_draw(preview, NULL);
gdk_flush();
}
/*-----------------------------------------------------------------------------------*/
/* Conversion routines */
/*-----------------------------------------------------------------------------------*/
void rgb_to_hsv (hsv r, hsv g, hsv b, hsv *h, hsv *s, hsv *l)
{
hsv v;
hsv m;
hsv vm;
hsv r2, g2, b2;
v = MAX(r,g);
v = MAX(v,b);
m = MIN(r,g);
m = MIN(m,b);
if ((*l = (m + v) / 2.0) <= 0.0)
{
*s = *h = 0;
return;
}
if ((*s = vm = v - m) > 0.0)
{
*s /= (*l <= 0.5) ? (v + m ) : (2.0 - v - m);
}
else
{
*h = 0;
return;
}
r2 = (v - r) / vm;
g2 = (v - g) / vm;
b2 = (v - b) / vm;
if (r == v)
*h = (g == m ? 5.0 + b2 : 1.0 - g2);
else if (g == v)
*h = (b == m ? 1.0 + r2 : 3.0 - b2);
else
*h = (r == m ? 3.0 + g2 : 5.0 - r2);
*h /= 6;
}
void hsv_to_rgb (hsv h, hsv sl, hsv l, hsv *r, hsv *g, hsv *b)
{
hsv v, m, sv;
gint sextant;
hsv fract, vsf, mid1, mid2;
v = (l <= 0.5) ? (l * (1.0 + sl)) : (l + sl - l * sl);
if (v <= 0)
{
*r = *g = *b = 0.0;
}
else
{
m = l + l - v;
sv = (v - m ) / v;
h *= 6.0;
sextant = h;
fract = h - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0: *r = v; *g = mid1; *b = m; break;
case 1: *r = mid2; *g = v; *b = m; break;
case 2: *r = m; *g = v; *b = mid1; break;
case 3: *r = m; *g = mid2; *b = v; break;
case 4: *r = mid1; *g = m; *b = v; break;
case 5: *r = v; *g = m; *b = mid2; break;
}
}
}
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