al_create_sub_bitmap
ALLEGRO_BITMAP *al_create_sub_bitmap(ALLEGRO_BITMAP *parent,
int x, int y, int w, int h)
Introduced in 5.0.0
Creates a sub-bitmap of the parent, at the specified coordinates and of the specified size. A sub-bitmap is a bitmap that shares drawing memory with a pre-existing (parent) bitmap, but possibly with a different size and clipping settings.
The sub-bitmap may originate off or extend past the parent bitmap.
See the discussion in al_get_backbuffer about using sub-bitmaps of the backbuffer.
The parent bitmap's clipping rectangles are ignored.
If a sub-bitmap was not or cannot be created then NULL is returned.
Note that destroying parents of sub-bitmaps will not destroy the sub-bitmaps; instead the sub-bitmaps become invalid and should no longer be used.
See also: al_create_bitmap
Examples: ex_clip, ex_logo, ex_subbitmap, ex_transform
Most helpful discussions:
- [A5] Drawing a sprite to a display (1)
- [Android] Backbuffer sub-bitmap crash
- How to show the draw of subbitmap in screen
- Stepping Into the Third Dimension
- GAME MENU
- About load bitmap
- Drawing antialiased primitives to bitmaps?
- Sub bitmaps in multiple threads
- Limit on Sub Bitmaps?
- Transparancy Difference on windows and ubuntu
Other recent discussions:
- KrampusHack 2016
- Creating sub-bitmap of locked bitmap
- Ludum Dare thread.
- [A5] Bitmap memory leaks (Release video texture failed)
- Problem with shaders (bitmap not drawn at all).
- Bug (or not) in Allegro
- Problem with ALLEGRO_FLIP_HORIZONTAL and spritesheet
- al_create_sub_bitmap not working for one bitmap
- Putting subbitmaps in vectors
- Allegro5 Save bitmap to byte array