English Amiga Board - View Single Post - Vertical Scrolling by blitting outside the bitmap

Shatterhand · 05 September 2019, 02:33

Yes, but I think if you are showing the crease of the bitmap, and you blit there, the colors will work. If you blit outside the bitmap but you tell the program to SHOW this "outside", colors are correct. I don't see why it shouldn't "work" except by the fact you are trashing the Chip Ram

I really think we should hear Roondar's advice and NOT use this amazing new technique discovered by me, hehehehe. What he said really made sense, I am writing the new graphics on a wrong area of memory, and that's why it shows properly, its because I am "displaying" that area of the memory.

But that area is not reserved for the bitmap, so anything could be there.

05 September 2019, 02:33	#21
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	Yes, but I think if you are showing the crease of the bitmap, and you blit there, the colors will work. If you blit outside the bitmap but you tell the program to SHOW this "outside", colors are correct. I don't see why it shouldn't "work" except by the fact you are trashing the Chip Ram I really think we should hear Roondar's advice and NOT use this amazing new technique discovered by me, hehehehe. What he said really made sense, I am writing the new graphics on a wrong area of memory, and that's why it shows properly, its because I am "displaying" that area of the memory. But that area is not reserved for the bitmap, so anything could be there.