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dline: fix odd x1/x2 handling with C_INVERT color (render-cg)

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Yann MAGNIN 2025-02-22 15:27:56 +01:00
parent c2cc3e48f2
commit 0950c9d29f
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1 changed files with 24 additions and 19 deletions
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src/render-cg/gint_dline.c
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@ -15,12 +15,17 @@ void gint_dhline(int x1, int x2, int y, int color)
int offset = DWIDTH * y;
/* Use longwords to do the copy, but first paint the endpoints to heed
for odd x1 and x2. Checking the parity may be a waste of time. */
for odd x1 and x2. Checking the parity may be a waste of time for
"real" color, but must be checked when C_INVERT in involved to
avoid "cancelling" invert effect with potential overdraw of the
next operation. */
if (color != C_INVERT) {
gint_vram[offset + x1] = color;
gint_vram[offset + x2] = color;
} else {
if (x1 & 1)
gint_vram[offset + x1] ^= 0xffff;
if (x2 & 1)
gint_vram[offset + x2] ^= 0xffff;
}