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Take cursor hotspot from pixbuf if available

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Allow -1 for the hotspot coordinates in gdk_cursor_new_from_pixbuf,
if the pixbuf contains the x_hot/y_hot options with appropriate values.

Bug #632140.
This commit is contained in:
Christian Persch 2010-10-15 14:34:44 -04:00 committed by Matthias Clasen
parent cbc358ead8
commit b5621b3c89
1 changed files with 31 additions and 0 deletions
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31
gdk/x11/gdkcursor-x11.c
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@ -44,6 +44,7 @@
#include <X11/extensions/Xfixes.h>
#endif
#include <string.h>
#include <errno.h>
static guint theme_serial = 0;
@ -641,6 +642,11 @@ create_cursor_image (GdkPixbuf *pixbuf,
* gdk_display_get_maximal_cursor_size() give information about
* cursor sizes.
*
* If @x or @y are <literal>-1</literal>, the pixbuf must have
* options named "x_hot" and "y_hot", resp., containing
* integer values between %0 and the width resp. height of
* the pixbuf. (Since: 3.0)
*
* On the X backend, support for RGBA cursors requires a
* sufficently new version of the X Render extension.
*
@ -658,9 +664,34 @@ gdk_cursor_new_from_pixbuf (GdkDisplay *display,
Cursor xcursor;
GdkCursorPrivate *private;
GdkCursor *cursor;
const char *option;
char *end;
gint64 value;
g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
if (x == -1 && (option = gdk_pixbuf_get_option (pixbuf, "x_hot")))
{
errno = 0;
end = NULL;
value = g_ascii_strtoll (option, &end, 10);
if (errno == 0 &&
end != option &&
value >= 0 && value < G_MAXINT)
x = (gint) value;
}
if (y == -1 && (option = gdk_pixbuf_get_option (pixbuf, "y_hot")))
{
errno = 0;
end = NULL;
value = g_ascii_strtoll (option, &end, 10);
if (errno == 0 &&
end != option &&
value >= 0 && value < G_MAXINT)
y = (gint) value;
}
g_return_val_if_fail (0 <= x && x < gdk_pixbuf_get_width (pixbuf), NULL);
g_return_val_if_fail (0 <= y && y < gdk_pixbuf_get_height (pixbuf), NULL);