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/* gradient.c -- draw Afterstep-like gradients in images
$Id: gradient.c 4301 2008-11-19 20:45:08Z chrisb $
Copyright (C) 1999 John Harper <john@dcs.warwick.ac.uk>
This file is part of sawmill.
sawmill 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, or (at your option)
any later version.
sawmill 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 sawmill; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "sawmill.h"
DEFUN("draw-vertical-gradient", Fdraw_vertical_gradient,
Sdraw_vertical_gradient, (repv img, repv from_, repv to_), rep_Subr3)
{
unsigned char from[3], to[3];
int width, height, stride, channels;
int x, y;
unsigned char *data;
rep_DECLARE1(img, IMAGEP);
rep_DECLARE2(from_, COLORP);
rep_DECLARE3(to_, COLORP);
data = image_pixels (VIMAGE(img));
width = image_width (VIMAGE(img));
height = image_height (VIMAGE(img));
stride = image_row_stride (VIMAGE(img));
channels = image_channels (VIMAGE(img));
from[0] = VCOLOR(from_)->red / 256;
from[1] = VCOLOR(from_)->green / 256;
from[2] = VCOLOR(from_)->blue / 256;
to[0] = VCOLOR(to_)->red / 256;
to[1] = VCOLOR(to_)->green / 256;
to[2] = VCOLOR(to_)->blue / 256;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
data[y*stride+x*channels+0] = (from[0] + (to[0] - from[0])
* y / height);
data[y*stride+x*channels+1] = (from[1] + (to[1] - from[1])
* y / height);
data[y*stride+x*channels+2] = (from[2] + (to[2] - from[2])
* y / height);
}
}
image_changed (VIMAGE (img));
return img;
}
DEFUN("draw-horizontal-gradient", Fdraw_horizontal_gradient,
Sdraw_horizontal_gradient, (repv img, repv from_, repv to_), rep_Subr3)
{
unsigned char from[3], to[3];
int width, height, stride, channels;
int x, y;
unsigned char *data;
rep_DECLARE1(img, IMAGEP);
rep_DECLARE2(from_, COLORP);
rep_DECLARE3(to_, COLORP);
data = image_pixels (VIMAGE(img));
width = image_width (VIMAGE(img));
height = image_height (VIMAGE(img));
stride = image_row_stride (VIMAGE(img));
channels = image_channels (VIMAGE(img));
from[0] = VCOLOR(from_)->red / 256;
from[1] = VCOLOR(from_)->green / 256;
from[2] = VCOLOR(from_)->blue / 256;
to[0] = VCOLOR(to_)->red / 256;
to[1] = VCOLOR(to_)->green / 256;
to[2] = VCOLOR(to_)->blue / 256;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
data[y*stride+x*channels+0] = (from[0] + (to[0] - from[0])
* x / width);
data[y*stride+x*channels+1] = (from[1] + (to[1] - from[1])
* x / width);
data[y*stride+x*channels+2] = (from[2] + (to[2] - from[2])
* x / width);
}
}
image_changed (VIMAGE (img));
return img;
}
DEFUN("draw-diagonal-gradient", Fdraw_diagonal_gradient,
Sdraw_diagonal_gradient, (repv img, repv from_, repv to_), rep_Subr3)
{
double from[3], to[3];
int width, height, stride, channels;
int x, y;
unsigned char *data;
rep_DECLARE1(img, IMAGEP);
rep_DECLARE2(from_, COLORP);
rep_DECLARE3(to_, COLORP);
data = image_pixels (VIMAGE(img));
width = image_width (VIMAGE(img));
height = image_height (VIMAGE(img));
stride = image_row_stride (VIMAGE(img));
channels = image_channels (VIMAGE(img));
from[0] = VCOLOR(from_)->red / 256;
from[1] = VCOLOR(from_)->green / 256;
from[2] = VCOLOR(from_)->blue / 256;
to[0] = VCOLOR(to_)->red / 256;
to[1] = VCOLOR(to_)->green / 256;
to[2] = VCOLOR(to_)->blue / 256;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
data[y*stride+x*channels+0] = ((from[0]
+ ((to[0] - from[0]) / 2.0)
* (((double) x / (double) width)
+ ((double) y / (double) height)))
+ 0.5);
data[y*stride+x*channels+1] = ((from[1]
+ ((to[1] - from[1]) / 2.0)
* (((double) x / (double) width)
+ ((double) y / (double) height)))
+ 0.5);
data[y*stride+x*channels+2] = ((from[2]
+ ((to[2] - from[2]) / 2.0)
* (((double) x / (double) width)
+ ((double) y / (double) height)))
+ 0.5);
}
}
image_changed (VIMAGE (img));
return img;
}
/* DL hooks */
repv
rep_dl_init (void)
{
repv tem = rep_push_structure ("sawfish.wm.util.gradient");
/* ::alias:gradient sawfish.wm.util.gradient:: */
rep_alias_structure ("gradient");
rep_ADD_SUBR(Sdraw_vertical_gradient);
rep_ADD_SUBR(Sdraw_horizontal_gradient);
rep_ADD_SUBR(Sdraw_diagonal_gradient);
return rep_pop_structure (tem);
}
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