tint a bitmap

no-reply@allegro.cc (jamal) — Sat, 17 Feb 2007 23:51:15 +0000

hi all,

i'd like to tint a bitmap with a color, so i tried draw_lit_sprite. the function seems to do what i want, but it doesn't seem to skip the transparent color. it there a way to make draw_lit_sprite skip the transparent color ?

no-reply@allegro.cc (gnolam) — Sat, 17 Feb 2007 23:54:12 +0000

It does mask out transparent pixels. Show us your code, and attach a sprite that displays incorrectly.

no-reply@allegro.cc (jamal) — Sun, 18 Feb 2007 00:12:14 +0000

i attached a screenshot of the problem :
the sprite at the bottom is the original sprite, drawn with draw_sprite, and the sprite at the top is drawn with draw_lit_sprite. here's the code :

set_add_blender(getr(color),getg(color),getb(color),128);
draw_lit_sprite(bmp, asteroid, (int)b->getX(), (int)b->getY(), 128);

btw i work in 16bpp mode.

no-reply@allegro.cc (X-G) — Sun, 18 Feb 2007 00:32:57 +0000

What does the sprite itself look like? Attach that, too.

no-reply@allegro.cc (jamal) — Sun, 18 Feb 2007 00:43:08 +0000

i was attaching the sprite when i noticed that the background color is ... black
i was sure that all my sprites background is magic pink, i tested whith the only one that is not. anyway, thanks for your help !

no-reply@allegro.cc (ImLeftFooted) — Sun, 18 Feb 2007 05:37:31 +0000

Bitmap *b;
Tint t;

t.a = 0.5f;

b->blitToScreen(x, y, t);

no-reply@allegro.cc (gnolam) — Sun, 18 Feb 2007 05:40:36 +0000

Can we please get Dustin a custom title of "Allegro.cc Official Troll"?

no-reply@allegro.cc (ImLeftFooted) — Sun, 18 Feb 2007 05:43:51 +0000

I was actually trying to get a plug for the Thing library, which would solve many of the OP's problems.

What I didn't bother explaining is that if you're trying to tint crap, you really shouldn't be using Allegro anymore.