- switch (setup->span.y_flags) {
- case 0x3:
- /* both odd and even lines written (both quad rows) */
- minleft = block(MIN2(xleft0, xleft1));
- maxright = block(MAX2(xright0, xright1));
- for (x = minleft; x <= maxright; x += 2) {
- /* determine which of the four pixels is inside the span bounds */
- uint mask = 0x0;
- if (x >= xleft0 && x < xright0)
- mask |= MASK_TOP_LEFT;
- if (x >= xleft1 && x < xright1)
- mask |= MASK_BOTTOM_LEFT;
- if (x+1 >= xleft0 && x+1 < xright0)
- mask |= MASK_TOP_RIGHT;
- if (x+1 >= xleft1 && x+1 < xright1)
- mask |= MASK_BOTTOM_RIGHT;
- if (mask)
- EMIT_QUAD( setup, x, setup->span.y, mask );
- }
- break;
-
- case 0x1:
- /* only even line written (quad top row) */
- minleft = block(xleft0);
- maxright = block(xright0);
- for (x = minleft; x <= maxright; x += 2) {
- uint mask = 0x0;
- if (x >= xleft0 && x < xright0)
- mask |= MASK_TOP_LEFT;
- if (x+1 >= xleft0 && x+1 < xright0)
- mask |= MASK_TOP_RIGHT;
- if (mask)
- EMIT_QUAD( setup, x, setup->span.y, mask );
- }
- break;
-
- case 0x2:
- /* only odd line written (quad bottom row) */
- minleft = block(xleft1);
- maxright = block(xright1);
- for (x = minleft; x <= maxright; x += 2) {
- uint mask = 0x0;
- if (x >= xleft1 && x < xright1)
- mask |= MASK_BOTTOM_LEFT;
- if (x+1 >= xleft1 && x+1 < xright1)
- mask |= MASK_BOTTOM_RIGHT;
- if (mask)
- EMIT_QUAD( setup, x, setup->span.y, mask );
- }
- break;
+ /* process quads in horizontal chunks of 16 */
+ for (x = minleft; x < maxright; x += step) {
+ unsigned skip_left0 = CLAMP(xleft0 - x, 0, step);
+ unsigned skip_left1 = CLAMP(xleft1 - x, 0, step);
+ unsigned skip_right0 = CLAMP(x + step - xright0, 0, step);
+ unsigned skip_right1 = CLAMP(x + step - xright1, 0, step);
+ unsigned lx = x;
+ unsigned q = 0;