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Name
Utilities -- Utility and miscellaneous convenience functions. Synopsis

#include <gdk-pixbuf/gdk-pixbuf.h>
GdkPixbuf*  
gdk-pixbuf-util.html#GDK-PIXBUF-ADD-ALPHAgdk_pixbuf_add_alpha             (const GdkPixbuf *pixbuf,
                                             gboolean substitute_color,
                                             guchar r,
                                             guchar g,
                                             guchar b);
void        
gdk-pixbuf-util.html#GDK-PIXBUF-COPY-AREAgdk_pixbuf_copy_area             (const GdkPixbuf *src_pixbuf,
                                             int src_x,
                                             int src_y,
                                             int width,
                                             int height,
                                             GdkPixbuf *dest_pixbuf,
                                             int dest_x,
                                             int dest_y);
Description
    These functions provide miscellaneous utilities for manipulating
    pixbufs.  The pixel data in pixbufs may of course be manipulated
    directly by applications, but several common operations can be
    performed by these functions instead.
  
Details
gdk_pixbuf_add_alpha ()
GdkPixbuf*  gdk_pixbuf_add_alpha            (const GdkPixbuf *pixbuf,
                                             gboolean substitute_color,
                                             guchar r,
                                             guchar g,
                                             guchar b);
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.
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. Returns :  A newly-created pixbuf with a reference count of 1. 
gdk_pixbuf_copy_area ()
void        gdk_pixbuf_copy_area            (const GdkPixbuf *src_pixbuf,
                                             int src_x,
                                             int src_y,
                                             int width,
                                             int height,
                                             GdkPixbuf *dest_pixbuf,
                                             int dest_x,
                                             int dest_y);
Copies a rectangular area from src_pixbuf to dest_pixbuf.  Conversion of
pixbuf formats is done automatically.
src_pixbuf :  Source pixbuf. src_x :  Source X coordinate within src_pixbuf. src_y :  Source Y coordinate within src_pixbuf. width :  Width of the area to copy. height :  Height of the area to copy. dest_pixbuf :  Destination pixbuf. dest_x :  X coordinate within dest_pixbuf. dest_y :  Y coordinate within dest_pixbuf. 
See Also
    GdkPixbuf
  
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