3a745537f0
2002-05-30 Havoc Pennington <hp@redhat.com> * src/main.c (main): verbose-log on startup whether we were compiled with various extensions * src/display.c (meta_display_queue_retheme_all_windows): reapply shape mask when changing themes, sucks to do it here though, makes theme changing slower. Needs fixing. * src/theme-parser.c (parse_toplevel_element): parse rounded corner options to frame_geometry * src/frames.c (meta_frames_apply_shapes): apply rounded corners if requested by the theme * configure.in (HAVE_SHAPE): check for shape extension
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/* Hack for grayscaling an image */
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/*
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* Copyright (C) 2002 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <math.h>
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#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
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static GdkPixbuf*
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grayscale_pixbuf (GdkPixbuf *pixbuf)
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{
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GdkPixbuf *gray;
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guchar *pixels;
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int rowstride;
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int pixstride;
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int row;
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int n_rows;
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int width;
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gray = gdk_pixbuf_copy (pixbuf);
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rowstride = gdk_pixbuf_get_rowstride (gray);
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pixstride = gdk_pixbuf_get_has_alpha (gray) ? 4 : 3;
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pixels = gdk_pixbuf_get_pixels (gray);
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n_rows = gdk_pixbuf_get_height (gray);
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width = gdk_pixbuf_get_width (gray);
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row = 0;
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while (row < n_rows)
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{
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guchar *p = pixels + row * rowstride;
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guchar *end = p + (pixstride * width);
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while (p != end)
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{
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double v = INTENSITY (p[0], p[1], p[2]);
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p[0] = (guchar) v;
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p[1] = (guchar) v;
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p[2] = (guchar) v;
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p += pixstride;
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}
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++row;
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}
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return gray;
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}
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int
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main (int argc, char **argv)
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{
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GdkPixbuf *pixbuf;
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GdkPixbuf *gray;
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GError *err;
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if (argc != 2)
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{
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g_printerr ("specify a single image on the command line\n");
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return 1;
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}
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g_type_init ();
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err = NULL;
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pixbuf = gdk_pixbuf_new_from_file (argv[1], &err);
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if (err != NULL)
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{
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g_printerr ("failed to load image: %s\n", err->message);
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g_error_free (err);
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return 1;
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}
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gray = grayscale_pixbuf (pixbuf);
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err = NULL;
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gdk_pixbuf_save (gray, "grayscale.png", "png", &err, NULL);
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if (err != NULL)
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{
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g_printerr ("failed to save image: %s\n", err->message);
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g_error_free (err);
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return 1;
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}
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g_print ("wrote grayscale.png\n");
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return 0;
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}
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