Aren/toaruos
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

graphics: fix alpha painting of sprites

Browse Source
This commit is contained in:
K. Lange 2021-07-13 21:58:31 +09:00
parent 35a0e63105
commit 1e6d0279db
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/graphics.c
View File

@ -817,9 +817,11 @@ void draw_sprite_alpha_paint(gfx_context_t * ctx, const sprite_t * sprite, int32
for (uint16_t _x = 0; _x < sprite->width; ++_x) {
if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
continue;
uint32_t n_color = SPRITE(sprite, _x, _y);
uint32_t f_color = rgb(_ALP(n_color) * alpha, 0, 0);
GFX(ctx, x + _x, y + _y) = alpha_blend(GFX(ctx, x + _x, y + _y), c, f_color);
/* Get the alpha from the sprite at this pixel */
float n_alpha = alpha * ((float)_ALP(SPRITE(sprite, _x, _y)) / 255.0);
uint32_t f_color = premultiply((c & 0xFFFFFF) | ((uint32_t)(255 * n_alpha) << 24));
f_color = (f_color & 0xFFFFFF) | ((uint32_t)(n_alpha * _ALP(c)) << 24);
GFX(ctx, x + _x, y + _y) = alpha_blend_rgba(GFX(ctx, x + _x, y + _y), f_color);
}
}
}