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System/Libraries/Graphics2D: Add member 'opacity' to Context2D

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This is meant to be used for alpha blending in the Compositor, unrelated
to the context's own alpha channel.
This commit is contained in:
Alec Murphy 2025-04-04 08:23:21 -04:00
parent f2800ba2d6
commit a9c623685d
1 changed files with 7 additions and 1 deletions
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8
System/Libraries/Graphics2D.HC
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@ -5,6 +5,7 @@ class @context2d
I64 width;
I64 height;
U32* fb;
I64 opacity;
};
class @callable_context2d : @context2d
@ -811,12 +812,17 @@ U0 Blot2D(Context2D* dst, I64 x, I64 y, Context2D* src)
I64 xx, yy;
I64 src_col, dst_col;
F64 alpha;
I64 plot_col;
for (yy = 0; yy < src->height; yy++) {
for (xx = 0; xx < src->width; xx++) {
src_col = Peek2D(src, xx, yy);
dst_col = Peek2D(dst, x + xx, y + yy);
alpha = src_col.u8[3] / 128; // FIXME: Alpha blending not working correctly.
Plot2D(dst, x + xx, y + yy, Blend2D(alpha, dst_col, src_col));
plot_col = Blend2D(alpha, dst_col, src_col);
if (src->opacity) {
plot_col.u8[3] = src->opacity;
}
Plot2D(dst, x + xx, y + yy, plot_col);
}
}
}