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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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GPG key ID: D82629D933EADC59
1 changed files with 24 additions and 19 deletions
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43
src/render-cg/gint_dline.c
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@ -15,14 +15,19 @@ 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. */
if (color != C_INVERT) {
gint_vram[offset + x1] = color;
gint_vram[offset + x2] = color;
} else {
gint_vram[offset + x1] ^= 0xffff;
gint_vram[offset + x2] ^= 0xffff;
}
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;
}
/* Now round to longword boundaries and copy everything in-between with
longwords */
@ -32,12 +37,12 @@ void gint_dhline(int x1, int x2, int y, int color)
uint32_t *start = (void *)(gint_vram + offset + x1);
uint32_t *end = (void *)(gint_vram + offset + x2);
if (color != C_INVERT) {
uint32_t op = (color << 16) | color;
while(end > start) *--end = op;
} else {
while(end > start) *--end ^= 0xffffffff;
}
if (color != C_INVERT) {
uint32_t op = (color << 16) | color;
while(end > start) *--end = op;
} else {
while(end > start) *--end ^= 0xffffffff;
}
}
/* gint_dvline(): Optimized vertical line */
@ -51,11 +56,11 @@ void gint_dvline(int y1, int y2, int x, int color)
uint16_t *v = gint_vram + DWIDTH * y1 + x;
int height = y2 - y1 + 1;
if (color != C_INVERT) {
while(height-- > 0) *v = color, v += DWIDTH;
} else {
while(height-- > 0) *v ^= 0xffff, v += DWIDTH;
}
if (color != C_INVERT) {
while(height-- > 0) *v = color, v += DWIDTH;
} else {
while(height-- > 0) *v ^= 0xffff, v += DWIDTH;
}
}
#endif