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 >> old<http://www.velocityreviews.com/forums/t906303-problem-with-alphachannel-with-sdl-xxx-blitting.html> >> >> questions<http://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 >> >> > ----- > eMail ist virenfrei. > Von AVG überprüft - www.avg.de > Version: 2012.0.2177 / Virendatenbank: 2425/5054 - Ausgabedatum: 07.06.2012 >
