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sna: Improve rendering of thin segments 

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-10-31 17:45:02 +00:00
parent 98b830a975
commit 8939ddbc27
1 changed files with 23 additions and 29 deletions
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52
src/sna/sna_accel.c
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@ -3820,6 +3820,8 @@ rectangle_continue:
*/
if (pt2_clipped)
length++;
if (length == 0)
continue;
if (pt1_clipped) {
int clipdx = abs(x1 - x);
@ -3827,24 +3829,22 @@ rectangle_continue:
e += clipdy * e2 + (clipdx - clipdy) * e1;
}
}
if (length == 0)
continue;
e3 = e2 - e1;
e = e - e1;
if (sdx < 0) {
x1 = x2;
y1 = y2;
sdy = -sdy;
}
b->x1 = x1;
b->y2 = b->y1 = y1;
while (--length) {
e += e1;
x1++;
if (e >= 0) {
b->x2 = x1;
if (b->x2 < b->x1) {
int16_t t = b->x1;
b->x1 = b->x2;
b->x2 = t;
}
b->x2++;
b->y2++;
if (++b == last_box) {
ret = &&X_continue;
@ -3855,19 +3855,11 @@ X_continue:
y1 += sdy;
e += e3;
b->y2 = b->y1 = y1;
b->x1 = x1 + sdx;
b->x1 = x1;
}
x1 += sdx;
}
b->x2 = x1;
if (b->x2 < b->x1) {
int16_t t = b->x1;
b->x1 = b->x2;
b->x2 = t;
}
if (gc->capStyle != CapNotLast)
b->x2++;
b->x2 = ++x1;
b->y2++;
if (++b == last_box) {
ret = &&X_continue2;
@ -3906,6 +3898,8 @@ X_continue2:
*/
if (pt2_clipped)
length++;
if (length == 0)
continue;
if (pt1_clipped) {
int clipdx = abs(x1 - x);
@ -3913,16 +3907,21 @@ X_continue2:
e += clipdx * e2 + (clipdy - clipdx) * e1;
}
}
if (length == 0)
continue;
e3 = e2 - e1;
e = e - e1;
if (sdx < 0) {
x1 = x2;
y1 = y2;
sdy = -sdy;
}
b->x2 = b->x1 = x1;
b->y1 = y1;
while (--length) {
e += e1;
y1 += sdy;
if (e >= 0) {
b->y2 = y1;
if (b->y2 < b->y1) {
@ -3931,30 +3930,25 @@ X_continue2:
b->y2 = t;
}
b->x2++;
b->y2++;
if (++b == last_box) {
ret = &&Y_continue;
goto *jump;
Y_continue:
b = box;
}
x1 += sdx;
e += e3;
b->x2 = b->x1 = x1;
b->y1 = y1 + sdy;
b->x2 = b->x1 = ++x1;
b->y1 = y1;
}
y1 += sdy;
}
b->y2 = y1;
b->y2 = y1 + sdy;
if (b->y2 < b->y1) {
int16_t t = b->y1;
b->y1 = b->y2;
b->y2 = t;
}
b->x2++;
if (gc->capStyle != CapNotLast)
b->y2++;
if (++b == last_box) {
ret = &&Y_continue2;
goto *jump;