These draw_something methods out of the SDLx packages just use blit at
the end anyway.
A tip: dont care about speed right now, just try to get things working.
Optimize at the end.
Cheers
Am 10.06.2012 18:42, schrieb Alex:
Hi!
When do we use blit and when do we use draw_something? Is blit faster /
better?
Best regards,
Alex
-Ursprüngliche Nachricht-
Von: Tobias Leich [mailto:em...@froggs.de]
Gesendet: Sonntag, 10. Juni 2012 10:47
An: Jack Maney; sdl-devel@perl.org
Betreff: AW: Transparency?
Hi, you have to know that draw_rect works differently for your app surface
and regular surfaces. If you draw to your app, the pixels just get the value
of the color. But if you do this to a regular surface, and blit that to your
app surface, the pixels will be blendet...
So create a new surface, modify that, blit and update.
Cheers
Jack Maney jma...@adknowledge.com hat geschrieben:
Hello,
I'm not so terribly new to Perl but very new to SDL. I was fiddling with
the following Hello, World!-ish code in the SDL manual:
use strict;
use warnings;
use SDL;
use SDLx::App;
my $app = SDLx::App-new( width= 800, height = 600 );
$app-draw_rect([ $app-width / 4, $app-height / 4,
$app-width / 2, $app-height / 2, ],
[ 0, 0, 255, 255] );
$app-update();
sleep(5);
and found that changing the alpha portion of the rectangle color (eg fading
the rectangle out completely via [0,0,255,0]) had no effect on the rendering
of the rectangle. I did some searching on this and found some
oldhttp://www.velocityreviews.com/forums/t906303-problem-with-alphachannel-with-sdl-xxx-blitting.html
questionshttp://markmail.org/message/lqtdvmmjmiryumrw#query:+page:1+mid:q63xng5hz7lpcsbl+state:results
from 4+ years ago, but I'm wondering if there is a simple workaround or an
approach that has come about since then.
Thank you for your time,
Jack
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