mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-18 17:30:10 +00:00
25a8142429
1999-12-02 Federico Mena Quintero <federico@redhat.com> * src/testpixbuf.c: #include <config.h>, and fix includes. * src/testpixbuf-drawable.c: #include <config.h>, and fix includes. * src/io-xpm.c: Fix includes. * src/io-tiff.c: Fix includes. * src/io-ras.c: Fix includes, and do not include more stuff than needed. * src/io-pnm.c: Fix inlcudes, and do not include more stuff than needed. * src/io-png.c: Fix includes. * src/io-ico.c: Fix includes, and do not include more stuff than needed. * src/io-gif.c: Fix includes, and do not include more stuff than needed. * src/io-bmp.c: Fix includes, and do not include more stuff than needed. * src/gnome-canvas-pixbuf.c: Fix includes. * src/gdk-pixbuf.c: Fix includes. * src/gdk-pixbuf-util.c: Fix includes. * src/gdk-pixbuf-render.c: Fix includes. * src/gdk-pixbuf-io.h: Fix includes. * src/gdk-pixbuf-drawable.c: Fix includes. * src/gdk-pixbuf-drawable.h: Use angle brackets for the gdk-pixbuf include files. * src/gdk-pixbuf-data.c: Fix includes. * src/gdk-pixbuf-loader.c: #include <config.h> * src/gdk-pixbuf-loader.h: Use angle brackets for the gdk-pixbuf include files. * src/Makefile.am: Commented out the gdk-pixbuf-drawable stuff, since it is not finished.
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/* GdkPixbuf library - Utilities and miscellaneous convenience functions
|
||
*
|
||
* Copyright (C) 1999 The Free Software Foundation
|
||
*
|
||
* Author: Federico Mena-Quintero <federico@gimp.org>
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU Library General Public
|
||
* License as published by the Free Software Foundation; either
|
||
* version 2 of the License, or (at your option) any later version.
|
||
*
|
||
* This library 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
|
||
* Library General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU Library General Public
|
||
* License along with this library; if not, write to the
|
||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
* Boston, MA 02111-1307, USA.
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include "gdk-pixbuf.h"
|
||
|
||
|
||
|
||
/**
|
||
* gdk_pixbuf_add_alpha:
|
||
* @pixbuf: A pixbuf.
|
||
* @substitute_color: Whether to substitute a color for zero opacity. If this
|
||
* is #FALSE, then the (@r, @g, @b) arguments will be ignored.
|
||
* @r: Red value to substitute.
|
||
* @g: Green value to substitute.
|
||
* @b: Blue value to substitute.
|
||
*
|
||
* Takes an existing pixbuf and adds an alpha channel to it. If the original
|
||
* pixbuf already had alpha information, then the contents of the new pixbuf are
|
||
* exactly the same as the original's. Otherwise, the new pixbuf will have all
|
||
* pixels with full opacity if @substitute_color is #FALSE. If
|
||
* @substitute_color is #TRUE, then the color specified by (@r, @g, @b) will be
|
||
* substituted for zero opacity.
|
||
*
|
||
* Return value: A newly-created pixbuf with a reference count of 1.
|
||
**/
|
||
GdkPixbuf *
|
||
gdk_pixbuf_add_alpha (GdkPixbuf *pixbuf, gboolean substitute_color, guchar r, guchar g, guchar b)
|
||
{
|
||
ArtPixBuf *apb;
|
||
ArtPixBuf *new_apb;
|
||
GdkPixbuf *new_pixbuf;
|
||
int x, y;
|
||
|
||
g_return_val_if_fail (pixbuf != NULL, NULL);
|
||
|
||
apb = pixbuf->art_pixbuf;
|
||
g_return_val_if_fail (apb->format == ART_PIX_RGB, NULL);
|
||
g_return_val_if_fail (apb->n_channels == 3 || apb->n_channels == 4, NULL);
|
||
g_return_val_if_fail (apb->bits_per_sample == 8, NULL);
|
||
|
||
if (apb->has_alpha) {
|
||
new_apb = art_pixbuf_duplicate (apb);
|
||
if (!new_apb)
|
||
return NULL;
|
||
|
||
return gdk_pixbuf_new_from_art_pixbuf (new_apb);
|
||
}
|
||
|
||
new_pixbuf = gdk_pixbuf_new (ART_PIX_RGB, TRUE, 8, apb->width, apb->height);
|
||
if (!new_pixbuf)
|
||
return NULL;
|
||
|
||
new_apb = new_pixbuf->art_pixbuf;
|
||
|
||
for (y = 0; y < apb->height; y++) {
|
||
guchar *src, *dest;
|
||
guchar tr, tg, tb;
|
||
|
||
src = apb->pixels + y * apb->rowstride;
|
||
dest = new_apb->pixels + y * new_apb->rowstride;
|
||
|
||
for (x = 0; x < apb->width; x++) {
|
||
tr = *dest++ = *src++;
|
||
tg = *dest++ = *src++;
|
||
tb = *dest++ = *src++;
|
||
|
||
if (substitute_color && tr == r && tg == g && tb == b)
|
||
*dest++ = 0;
|
||
else
|
||
*dest++ = 255;
|
||
}
|
||
}
|
||
|
||
return new_pixbuf;
|
||
}
|