[fpc-devel] sdlgraph, pre-alpha

[Jonas Maebe]

On 22 Aug 2007, at 21:18, Micha Nelissen wrote:

> Michael Van Canneyt wrote:
>>> Why is calling via a procvar very much slower than a normal  
>>> call ? It's
>>> just an extra memory fetch (hopefully in cache) ?
>>
>> Jonas meant that each pixel is drawn separately. The procvar is  
>> not the issue.
>
> Before me going too far in unknown territory, but isn't that the basis
> for any software implemented graphics routine: drawing pixels ?

Yes, but not with a call and location calculation per pixel (and who  
knows what else SLD_putpixel does behind the scenes). And in case of  
horizontal lines, you usually draw several pixels at a time (or at  
least blit them using a fillchar/word/dword-like routine).


Jonas