/* xpm-ximage.c --- converts XPM data to an XImage for use with OpenGL.
- * xscreensaver, Copyright (c) 1998 Jamie Zawinski <jwz@jwz.org>
+ * xscreensaver, Copyright (c) 1998-2003 Jamie Zawinski <jwz@jwz.org>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
+ *
+ * Alpha channel support by Eric Lassauge <lassauge@users.sourceforge.net>
*/
#ifdef HAVE_CONFIG_H
#include <stdlib.h>
#include <stdio.h>
-#include <X11/Intrinsic.h>
+#include <X11/Xlib.h>
extern char *progname;
-#ifdef HAVE_XPM /* whole file */
+
+#if defined(HAVE_GDK_PIXBUF)
+
+# include <gdk-pixbuf/gdk-pixbuf.h>
+
+# ifdef HAVE_GTK2
+# include <gdk-pixbuf-xlib/gdk-pixbuf-xlib.h>
+# else /* !HAVE_GTK2 */
+# include <gdk-pixbuf/gdk-pixbuf-xlib.h>
+# endif /* !HAVE_GTK2 */
+
+
+/* Returns an XImage structure containing the bits of the given XPM image.
+ This XImage will be 32 bits per pixel, 8 each per R, G, and B, with the
+ extra byte set to either 0xFF or 0x00 (based on the XPM file's mask.)
+
+ The Display and Visual arguments are used only for creating the XImage;
+ no bits are pushed to the server.
+
+ The Colormap argument is used just for parsing color names; no colors
+ are allocated.
+
+ This is the gdk_pixbuf version of this function.
+ */
+static XImage *
+xpm_to_ximage_1 (Display *dpy, Visual *visual, Colormap cmap,
+ const char *filename,
+ char **xpm_data)
+{
+ GdkPixbuf *pb;
+ static int initted = 0;
+#ifdef HAVE_GTK2
+ GError *gerr = NULL;
+#endif
+
+ if (!initted)
+ {
+#ifdef HAVE_GTK2
+ g_type_init ();
+#endif
+ gdk_pixbuf_xlib_init (dpy, DefaultScreen (dpy));
+ xlib_rgb_init (dpy, DefaultScreenOfDisplay (dpy));
+ initted = 1;
+ }
+
+ pb = (filename
+#ifdef HAVE_GTK2
+ ? gdk_pixbuf_new_from_file (filename, &gerr)
+#else
+ ? gdk_pixbuf_new_from_file (filename)
+#endif /* HAVE_GTK2 */
+ : gdk_pixbuf_new_from_xpm_data ((const char **) xpm_data));
+ if (pb)
+ {
+ XImage *image;
+ int w = gdk_pixbuf_get_width (pb);
+ int h = gdk_pixbuf_get_height (pb);
+ guchar *row = gdk_pixbuf_get_pixels (pb);
+ int stride = gdk_pixbuf_get_rowstride (pb);
+ int chan = gdk_pixbuf_get_n_channels (pb);
+ int x, y;
+
+ image = XCreateImage (dpy, visual, 32, ZPixmap, 0, 0, w, h, 32, 0);
+ image->data = (char *) malloc(h * image->bytes_per_line);
+ if (!image->data)
+ {
+ fprintf (stderr, "%s: out of memory (%d x %d)\n", progname, w, h);
+ exit (1);
+ }
+
+ for (y = 0; y < h; y++)
+ {
+ int y2 = (h-1-y); /* Texture maps are upside down. */
+
+ guchar *i = row;
+ for (x = 0; x < w; x++)
+ {
+ unsigned long rgba = 0;
+ switch (chan) {
+ case 1:
+ rgba = ((0xFF << 24) |
+ (*i << 16) |
+ (*i << 8) |
+ *i);
+ i++;
+ break;
+ case 3:
+ rgba = ((0xFF << 24) |
+ (i[2] << 16) |
+ (i[1] << 8) |
+ i[0]);
+ i += 3;
+ break;
+ case 4:
+ rgba = ((i[3] << 24) |
+ (i[2] << 16) |
+ (i[1] << 8) |
+ i[0]);
+ i += 4;
+ break;
+ default:
+ abort();
+ break;
+ }
+ XPutPixel (image, x, y2, rgba);
+ }
+ row += stride;
+ }
+ gdk_pixbuf_unref (pb); /* #### does doing this free colors? */
+
+ return image;
+ }
+ else if (filename)
+ {
+#ifdef HAVE_GTK2
+ fprintf (stderr, "%s: %s\n", progname, gerr->message);
+ g_error_free (gerr);
+#else
+ fprintf (stderr, "%s: unable to load %s\n", progname, filename);
+#endif /* HAVE_GTK2 */
+ exit (1);
+ }
+ else
+ {
+ fprintf (stderr, "%s: unable to initialize builtin texture\n", progname);
+ exit (1);
+ }
+}
+
+
+#elif defined(HAVE_XPM)
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <X11/Intrinsic.h>
#include <X11/Xutil.h>
#include <X11/xpm.h>
+#undef countof
+#define countof(x) (sizeof((x))/sizeof((*x)))
+
+#if 0
static Bool
bigendian (void)
{
u.i = 1;
return !u.c[0];
}
+#endif
-/* Returns an XImage structure containing the bits of the given XPM image.
- This XImage will be 32 bits per pixel, 8 each per R, G, and B, with the
- extra byte set to 0xFF.
-
- The Display and Visual arguments are used only for creating the XImage;
- no bits are pushed to the server.
-
- The Colormap argument is used just for parsing color names; no colors
- are allocated.
+/* The libxpm version of this function...
*/
-XImage *
-xpm_to_ximage (Display *dpy, Visual *visual, Colormap cmap, char **xpm_data)
+static XImage *
+xpm_to_ximage_1 (Display *dpy, Visual *visual, Colormap cmap,
+ const char *filename, char **xpm_data)
{
/* All we want to do is get RGB data out of the XPM file built in to this
program. This is a pain, because there is no way (as of XPM version
out the RGB values of the pixels ourselves; and construct an XImage
by hand. Regardless of the depth of the visual we're using, this
XImage will have 32 bits per pixel, 8 each per R, G, and B. We put
- 0xFF in the fourth slot, as GL will interpret that as "alpha".
+ 0xFF or 0x00 in the fourth (alpha) slot, depending on the file's mask.
*/
XImage *ximage = 0;
XpmImage xpm_image;
XpmInfo xpm_info;
int result;
+ int transparent_color_index = -1;
int x, y, i;
int bpl, wpl;
- XColor colors[255];
+ XColor colors[256];
memset (&xpm_image, 0, sizeof(xpm_image));
memset (&xpm_info, 0, sizeof(xpm_info));
+
+ if (filename)
+ {
+ xpm_data = 0;
+ if (! XpmReadFileToData ((char *) filename, &xpm_data))
+ {
+ fprintf (stderr, "%s: unable to read XPM file %s\n",
+ progname, filename);
+ exit (1);
+ }
+ }
+
result = XpmCreateXpmImageFromData (xpm_data, &xpm_image, &xpm_info);
if (result != XpmSuccess)
{
exit (1);
}
+ if (xpm_image.ncolors > countof(colors))
+ {
+ fprintf (stderr, "%s: too many colors (%d) in XPM.\n",
+ progname, xpm_image.ncolors);
+ exit (1);
+ }
+
ximage = XCreateImage (dpy, visual, 32, ZPixmap, 0, 0,
xpm_image.width, xpm_image.height, 32, 0);
/* Parse the colors in the XPM into RGB values. */
for (i = 0; i < xpm_image.ncolors; i++)
- if (!XParseColor(dpy, cmap, xpm_image.colorTable[i].c_color, &colors[i]))
- {
- fprintf(stderr, "%s: unparsable color: %s\n", progname,
- xpm_image.colorTable[i].c_color);
- exit(1);
- }
+ {
+ const char *c = xpm_image.colorTable[i].c_color;
+ if (!c)
+ {
+ fprintf(stderr, "%s: bogus color table? (%d)\n", progname, i);
+ exit (1);
+ }
+ else if (!strncasecmp (c, "None", 4))
+ {
+ transparent_color_index = i;
+ colors[transparent_color_index].red = 0xFF;
+ colors[transparent_color_index].green = 0xFF;
+ colors[transparent_color_index].blue = 0xFF;
+ }
+ else if (!XParseColor (dpy, cmap, c, &colors[i]))
+ {
+ fprintf(stderr, "%s: unparsable color: %s\n", progname, c);
+ exit (1);
+ }
+ }
/* Translate the XpmImage to an RGB XImage. */
{
things as necessary) OpenGL pretends everything is client-side, so
we need to pack things in the right order for the client machine.
*/
+#if 0
+ /* #### Cherub says that the little-endian case must be taken on MacOSX,
+ or else the colors/alpha are the wrong way around. How can
+ that be the case?
+ */
if (bigendian())
rpos = 24, gpos = 16, bpos = 8, apos = 0;
else
+#endif
rpos = 0, gpos = 8, bpos = 16, apos = 24;
for (y = 0; y < xpm_image.height; y++)
for (x = 0; x < xpm_image.width; x++)
{
XColor *c = &colors[iline[x]];
- /* pack it as RGBA */
- oline[x] = (((c->red >> 8) << rpos) |
- ((c->green >> 8) << gpos) |
- ((c->blue >> 8) << bpos) |
- (0xFF << apos));
+ int alpha = ((iline[x] == transparent_color_index) ? 0x00 : 0xFF);
+ oline[x] = (((c->red >> 8) << rpos) |
+ ((c->green >> 8) << gpos) |
+ ((c->blue >> 8) << bpos) |
+ (alpha << apos));
}
}
}
}
-#else /* !HAVE_XPM */
+#else /* !HAVE_XPM && !HAVE_GDK_PIXBUF */
-XImage *
-xpm_to_ximage (char **xpm_data)
+static XImage *
+xpm_to_ximage_1 (Display *dpy, Visual *visual, Colormap cmap,
+ const char *filename, char **xpm_data)
{
- fprintf(stderr, "%s: not compiled with XPM support.\n", progname);
+ fprintf(stderr, "%s: not compiled with XPM or Pixbuf support.\n", progname);
exit (1);
}
#endif /* !HAVE_XPM */
+
+
+/* Returns an XImage structure containing the bits of the given XPM image.
+ This XImage will be 32 bits per pixel, 8 each per R, G, and B, with the
+ extra byte set to either 0xFF or 0x00 (based on the XPM file's mask.)
+
+ The Display and Visual arguments are used only for creating the XImage;
+ no bits are pushed to the server.
+
+ The Colormap argument is used just for parsing color names; no colors
+ are allocated.
+ */
+XImage *
+xpm_to_ximage (Display *dpy, Visual *visual, Colormap cmap, char **xpm_data)
+{
+ return xpm_to_ximage_1 (dpy, visual, cmap, 0, xpm_data);
+}
+
+
+XImage *
+xpm_file_to_ximage (Display *dpy, Visual *visual, Colormap cmap,
+ const char *filename)
+{
+ return xpm_to_ximage_1 (dpy, visual, cmap, filename, 0);
+}
projects / xscreensaver / blobdiff