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- mallen22@concentric.net
- http://members.tripod.com/mxf_entertainment/
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Speed of color-keying (or something)
The transparent one will be a lot faster. Each pixel of the non-transparent one will have to be written to the destination surface, but none will on the transparent one. Blit checks each pixel to see if it matches the color key, and if it does, it doesn't write it to the destination surface. Now blitting with a color key when the surface has none of that color will be slower than if you don't blit with the color key because it won't have to check each pixel to see if it matches the color key.
What are you talking about? Bliting a surface with transparent pixels is much slower then one with all non-transparent pixels. If you need to blit a transparent pixel then you blit with a color key. If you don't need to blit any transparent pixels then don't use the color key, then it doesn't have to check each pixel.
note: the fastest method of bliting a sprite with transparent pixels is to make it into a compiled sprite.
Author
Lets say one surface doesent have any transparent parts and the other is totaly transparent.
Whitch one will be blted faster(or they will be blted the same speed)
Whitch one will be blted faster(or they will be blted the same speed)
Not the issue. It IS faster not to move a pixel compared to actually moving it. E.g.
get pixel into register
if (! pixel transparent)
write pixel
is faster than
get pixel into register
write pixel
If there's a "sufficient" number of transparent pixels (I have no exact numbers - do the test)...
/Niels
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