From: dkmmouse AT aol DOT com
Newsgroups: comp.os.msdos.djgpp
Subject: Allegro 2.1 stretch_blit() bug?
Date: 19 Nov 1996 14:36:25 GMT
Organization: AOL http://www.aol.com
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To: djgpp AT delorie DOT com
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I seem to have a problem with the stretch_blit function in Allegro 2.1. 
 void stretch_blit(BITMAP *source, BITMAP *dest,
		  int source_x, source_y, source_width, source_height,
		  int dest_x, dest_y, dest_width, dest_height);

If I try to change source_y to anything other than 0, it crashes.  I'm
able to change source_x with no problems but not source_y.  For example,
if I change the line in test.c from:

 stretch_blit(global_sprite, screen, 0, 0, 32, 32, SCREEN_W/2-c,
SCREEN_H/2-(256-c), c*2, (256-c)*2);

to..

 stretch_blit(global_sprite, screen, 0, 1, 32, 32, SCREEN_W/2-c,
SCREEN_H/2-(256-c), c*2, (256-c)*2);

Then it crashes during the stretch.  Has anyone else tried this?  Am I
doing something wrong?  How can this be fixed?