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| Transparency in bitmaps of Allegro 5 |
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Lucas Adami
Member #8,528
April 2007
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Hello. I'm unsing Allegro 5 here and I didn't find any function that makes my bitmap transparent. On the old Allegro, the functions for this were: - set_trans_blender - draw_trans_sprite Could anyone help and tell me what I have to do in the new Allegro? |
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Matthew Leverton
Supreme Loser
January 1999
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It works with the alpha channel. Something like: al_set_blender(ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA, al_map_rgb(255,255,255)); al_draw_bitmap(bmp, 0,0);
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OnlineCop
Member #7,919
October 2006
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From here, the first thing that caught my eye was al_convert_mask_to_alpha
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Lucas Adami
Member #8,528
April 2007
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Thanks Matthew. That was what I needed! |
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Trent Gamblin
Member #261
April 2000
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You can do this too, to give any bitmap a degree of translucency: // load bitmap int alpha = 128; // half translucent al_set_blender(ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA, al_map_rgba(255, 255, 255, alpha)); al_draw_bitmap(bmp, 0, 0, 0);
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