Name
Utilities -- Utility and miscellaneous convenience functions.
Synopsis
#include <gdk-pixbuf/gdk-pixbuf.h>
GdkPixbuf* gdk_pixbuf_add_alpha (const GdkPixbuf *pixbuf,
gboolean substitute_color,
guchar r,
guchar g,
guchar b);
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); |
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.
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.