Re: Fast Image Manipulation?

[Federico Mena Quintero <federico nuclecu unam mx>]

>  Now, if I were drawing straight to the screen, I could keep my items image as a
>  gdk pixmap and do a simple gdk_draw_pixmap to blast the appropriate section.
>  
>  If I use gdk_imlib_paste_image, I don't get to choose a section, it just scales
>  the image to fit. I'd have to do a gdk_imlib_crop_and_clone_image first, which
>  is too slow (I assume). Or, I'd have to do that at the beginning, and keep many
>  smaller item images, which takes up more memory (I assume). That's not good
>  because I may have many item types and frames.

You need to do the following.

When your game starts up, load all the images using gdk_imlib.  Render
them with gdk_imlib_render(), and extract the pixmaps/masks with
gdk_imlib_move_image() and gdk_imlib_move_mask(), respectively.  Keep
those pixmaps around.

When you need to paint a frame, clear your off-screen pixmap, and then
fill it using gdk_draw_pixmap() from the pixmaps you created when the
game started up.  Then blast the off-screen pixmap to your drawing
area.

  Federico