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/* gdk-pixbuf-hacks.c
*
* Copyright 2001-2002 Lutz Mueller <lutz@users.sf.net>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdk-pixbuf-hacks.h"
#define COPY90 \
if ((r2 < h1) && (c2 < w1)) { \
if ((w1 <= h1) && (r1 < h2)) \
for (i = 0; i < c; i++) \
new_pixels[r1 * rs2 + c1 * c + i] = \
pixels[r2 * rs1 + c2 * c + i]; \
if ((w1 > h1) && (c1 > (w1 - h2))) \
for (i = 0; i < c; i++) \
new_pixels[r1 * rs2 + (c1 - (w1 - h1)) * c + i] = \
pixels[r2 * rs1 + c2 * c + i]; \
}
#define COPY270 \
if ((r2 < h1) && (c2 < w1)) { \
if ((h1 > w1) && (r1 > (h1 - w1))) \
for (i = 0; i < c; i++) \
new_pixels[(r1 - (h1 - w1)) * rs2 + c1 * c + i] = \
pixels[r2 * rs1 + c2 * c + i]; \
if ((h1 <= w1) && (c1 < w2)) \
for (i = 0; i < c; i++) \
new_pixels[r1 * rs2 + c1 * c + i] = \
pixels[r2 * rs1 + c2 * c + i]; \
}
GdkPixbuf *
gdk_pixbuf_rotate (GdkPixbuf *pixbuf, guint angle)
{
GdkPixbuf *new = NULL;
guint row, col, w1, h1, w2, h2;
guint r1, r2, c1, c2;
guint rs1, rs2;
guint c;
guint i;
guchar *pixels, *new_pixels;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
switch (angle) {
case 0:
return (gdk_pixbuf_copy (pixbuf));
case 180:
new = gdk_pixbuf_new (
gdk_pixbuf_get_colorspace (pixbuf),
gdk_pixbuf_get_has_alpha (pixbuf),
gdk_pixbuf_get_bits_per_sample (pixbuf),
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf));
break;
case 90:
case 270:
new = gdk_pixbuf_new (
gdk_pixbuf_get_colorspace (pixbuf),
gdk_pixbuf_get_has_alpha (pixbuf),
gdk_pixbuf_get_bits_per_sample (pixbuf),
gdk_pixbuf_get_height (pixbuf),
gdk_pixbuf_get_width (pixbuf));
break;
default:
g_warning ("Rotation by %i not implemented.", angle);
break;
}
rs1 = gdk_pixbuf_get_rowstride (pixbuf);
rs2 = gdk_pixbuf_get_rowstride (new);
c = gdk_pixbuf_get_has_alpha (pixbuf) ? 4 : 3;
w1 = gdk_pixbuf_get_width (pixbuf);
h1 = gdk_pixbuf_get_height (pixbuf);
w2 = gdk_pixbuf_get_width (new);
h2 = gdk_pixbuf_get_height (new);
pixels = gdk_pixbuf_get_pixels (pixbuf);
new_pixels = gdk_pixbuf_get_pixels (new);
/*
* For rotation by 90 or 270, we assume the pixbuf to be a
* square and move (r2,c2) to (r1,c1):
*/
switch (angle) {
case 90:
for (row = 0; row < MAX (w1, h1) / 2; row++) {
for (col = row; col < MAX (w1, h1) - row - 1; col++) {
r1 = row;
c1 = col;
r2 = MAX (w1, h1) - col - 1;
c2 = row;
COPY90;
r1 = r2;
c1 = c2;
r2 = MAX (w1, h1) - row - 1;
c2 = MAX (w1, h1) - col - 1;
COPY90;
r1 = r2;
c1 = c2;
r2 = col;
c2 = MAX (w1, h1) - row - 1;
COPY90;
r1 = r2;
c1 = c2;
r2 = row;
c2 = col;
COPY90;
}
}
break;
case 270:
for (row = 0; row < MAX (w1, h1) / 2; row++) {
for (col = row; col < MAX (w1, h1) - row - 1; col++) {
r1 = row;
c1 = col;
r2 = col;
c2 = MAX (w1, h1) - row - 1;
COPY270;
r1 = r2;
c1 = c2;
r2 = MAX (w1, h1) - row - 1;
c2 = MAX (w1, h1) - col - 1;
COPY270;
r1 = r2;
c1 = c2;
r2 = MAX (w1, h1) - col - 1;
c2 = row;
COPY270;
r1 = r2;
c1 = c2;
r2 = row;
c2 = col;
COPY270;
}
}
break;
case 180:
for (row = 0; row < h1; row++) {
for (col = 0; col < w1; col++) {
r1 = row;
c1 = col;
r2 = h1 - row - 1;
c2 = w1 - col - 1;
for (i = 0; i < c; i++) {
new_pixels[r2 * rs2 + c2 * c + i] =
pixels[r1 * rs1 + c1 * c + i];
}
}
}
break;
default:
g_warning ("Rotation by %i not implemented.", angle);
break;
}
return (new);
}
void
gdk_pixbuf_add (GdkPixbuf *pixbuf, int offset_x, int offset_y,
GdkPixbuf *pixbuf_to_add)
{
guchar *p1, *p2, a1, a2;
guint w1, h1, w2, h2, r1, r2;
guint row, col, i, pos1, pos2;
g_return_if_fail (pixbuf != NULL);
g_return_if_fail (pixbuf_to_add != NULL);
w1 = gdk_pixbuf_get_width (pixbuf);
h1 = gdk_pixbuf_get_height (pixbuf);
w2 = gdk_pixbuf_get_width (pixbuf_to_add);
h2 = gdk_pixbuf_get_height (pixbuf_to_add);
g_return_if_fail (w1 >= offset_x + w2);
g_return_if_fail (h1 >= offset_y + h2);
p1 = gdk_pixbuf_get_pixels (pixbuf);
p2 = gdk_pixbuf_get_pixels (pixbuf_to_add);
r1 = gdk_pixbuf_get_rowstride (pixbuf);
r2 = gdk_pixbuf_get_rowstride (pixbuf_to_add);
for (row = 0; row < h2; row++) {
for (col = 0; col < w2; col++) {
pos1 = (row + offset_y) * r1 + (col + offset_x) * 4;
pos2 = row * r2 + col * 4;
a1 = p1[pos1 + 3];
a2 = p2[pos2 + 3];
for (i = 0; i < 3; i++) {
p1[pos1 + i] *=
((gfloat) (0xff - a2) / (gfloat) 0xff);
p1[pos1 + i] += (p2[pos2 + i] *
((gfloat) a2 / (gfloat) 0xff));
}
p1[pos1 + 3] = MAX (a1, a2);
}
}
}
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