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This commit is contained in:
Amy Bowersox 2019-12-10 14:06:23 -07:00
parent 85144de58f
commit 962f13dc1a
1 changed files with 6 additions and 4 deletions
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10
src/devctxt.c
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@ -21,7 +21,7 @@ inline static BYTE line_clip_outcode(INT32 x, INT32 y, INT32 xmin, INT32 ymin, I
static BOOL line_clip(PINT32 output, INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT32 xmin, INT32 ymin, INT32 xmax, INT32 ymax) static BOOL line_clip(PINT32 output, INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT32 xmin, INT32 ymin, INT32 xmax, INT32 ymax)
{ {
BYTE outcode1, outcode2, tmpb; BYTE outcode1, outcode2;
INT32 tmp; INT32 tmp;
Log(LDEBUG, "clipping line from (%d, %d) to (%d, %d) against bounding box (%d, %d, %d, %d)", x1 >> 16, y1 >> 16, x2 >> 16, y2 >> 16, Log(LDEBUG, "clipping line from (%d, %d) to (%d, %d) against bounding box (%d, %d, %d, %d)", x1 >> 16, y1 >> 16, x2 >> 16, y2 >> 16,
@ -51,9 +51,7 @@ static BOOL line_clip(PINT32 output, INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT
tmp = y1; tmp = y1;
y1 = y2; y1 = y2;
y2 = tmp; y2 = tmp;
tmpb = outcode1; outcode1 = outcode2; /* we don't reference outcode2 in the rest of the loop */
outcode1 = outcode2;
outcode2 = tmpb;
} }
if (outcode1 & 0x8) if (outcode1 & 0x8)
{ {
@ -78,6 +76,10 @@ static BOOL line_clip(PINT32 output, INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT
} }
else if (outcode1 & 0x1) else if (outcode1 & 0x1)
{ {
int term1 = y2 - y1;
int term2 = xmin - x1;
int term3 = x2 - x1;
Log(LDEBUG, "term1=%d term2=%d term3=%d", term1 >> 16, term2 >> 16, term3 >> 16);
tmp = (y2 - y1) * ((xmin - x1) / (x2 - x1)); tmp = (y2 - y1) * ((xmin - x1) / (x2 - x1));
y1 -= tmp; y1 -= tmp;
x1 = xmin; x1 = xmin;