exalpha(3)

✨ exalpha — bestie edition ✨

okay so this is exalpha(3), straight out of the Allegro manual, and it's the Allegro game programming library btw 💖 so you know it's the real deal. It's all about creating and using 32 bit RGBA sprites and honestly? iconic. 👑

🌸 SYNOPSIS 🌸

#include <allegro.h>

Example exalpha

🦋 DESCRIPTION 🦋

okay so listen, this program is literally a whole demo of how to use the 32 bit RGBA translucency functions to store an alpha channel along with a bitmap graphic. like, the alpha channel is just living in there with the bitmap. besties. 🫶

Two images get loaded from disk:

• one of them is the background 🌈
• the other one is the sprite ✨

Then — and this is the main character moment — the example generates an alpha channel for the sprite image, composing that 32 bit RGBA bitmap during runtime, and draws it at the position of the mouse cursor. 🖱️💅

so it follows your mouse around. yes really. slay.

👑 SEE ALSO 👑

like all the siblings, fr fr. go read these too:

• BITMAP(3)
• END_OF_MAIN(3)
• SCREEN_H(3)
• SCREEN_W(3)
• allegro_error(3)
• allegro_init(3)
• allegro_message(3)
• blit(3)
• clear_keybuf(3)
• create_bitmap(3)
• destroy_bitmap(3)
• draw_trans_sprite(3)
• drawing_mode(3)
• font(3)
• getb(3)
• getg(3)
• getpixel(3)
• getr(3)
• install_keyboard(3)
• install_mouse(3)
• install_timer(3)
• keypressed(3)
• load_bitmap(3)
• makecol(3)
• mouse_x(3)
• mouse_y(3)
• putpixel(3)
• rectfill(3)
• replace_filename(3)
• screen(3)
• set_alpha_blender(3)
• set_color_conversion(3)
• set_color_depth(3)
• set_gfx_mode(3)
• set_multiply_blender(3)
• set_write_alpha_blender(3)
• solid_mode(3)
• stretch_blit(3)
• textprintf_ex(3)

💖 and that's the whole page, bestie 💖 This lil gem comes to you from Allegro, version 4.4.3, dated exalpha(3) — mwah, no notes, go write some RGBA sprites. 🎀🦋🌸