diff options
Diffstat (limited to 'gdk-pixbuf/gdk-pixbuf.c')
| -rw-r--r-- | gdk-pixbuf/gdk-pixbuf.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/gdk-pixbuf/gdk-pixbuf.c b/gdk-pixbuf/gdk-pixbuf.c index 2a65082d93..12b8e61441 100644 --- a/gdk-pixbuf/gdk-pixbuf.c +++ b/gdk-pixbuf/gdk-pixbuf.c @@ -409,6 +409,64 @@ gdk_pixbuf_error_quark (void) return q; } +/** + * gdk_pixbuf_fill: + * @pixbuf: a #GdkPixbuf + * @pixel: RGBA pixel to clear to (0xffffff00 is opaque white, 0x000000ff transparent black) + * + * Clears a pixbuf to the given RGBA value, converting the RGBA value into + * the pixbuf's pixel format. The alpha will be ignored if the pixbuf + * doesn't have an alpha channel. + * + **/ +void +gdk_pixbuf_fill (GdkPixbuf *pixbuf, + guint32 pixel) +{ + guchar *pixels; + gboolean all_the_same = FALSE; + guint r, g, b, a; + + g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); + + pixels = pixbuf->pixels; + + r = (pixel & 0xff000000) >> 24; + g = (pixel & 0x00ff0000) >> 16; + b = (pixel & 0x0000ff00) >> 8; + a = (pixel & 0x000000ff); + + if (r == g && g == b) { + if (!pixbuf->has_alpha) + all_the_same = TRUE; + else + all_the_same = (r == a); + } + + if (all_the_same) { + memset (pixels, r, + pixbuf->rowstride * pixbuf->height); + } else { + guchar *p; + guchar *end; + + /* feel free to optimize this */ + + p = pixels; + end = pixels + pixbuf->rowstride * pixbuf->height; + end -= (pixbuf->rowstride - pixbuf->width); + + while (p < end) { + *p++ = r; + *p++ = g; + *p++ = b; + if (pixbuf->has_alpha) + *p++ = a; + } + } +} + + /* Include the marshallers */ #include <glib-object.h> #include "gdk-pixbuf-marshal.c" |