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tor: Suppress repeated spans

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Under certain circumstances we will emit identical spans for when the
edge covers the entire pixel and then for the subsequent pixels. These
can be squashed into a single span.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2011-07-31 21:48:47 +01:00
parent c0407e84e9
commit 4a8f638c9a
1 changed files with 2 additions and 2 deletions
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4
src/cairo-tor-scan-converter.c
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@ -1816,7 +1816,7 @@ blit_with_span_renderer (struct cell_list *cells,
{
struct cell *cell = cells->head.next;
int prev_x = xmin, last_x = -1;
int cover = 0, last_cover = -1;
int cover = 0, last_cover = 0;
cairo_half_open_span_t *spans;
unsigned num_spans;
@ -1851,7 +1851,7 @@ blit_with_span_renderer (struct cell_list *cells,
int x = cell->x;
int area;
if (x > prev_x) {
if (x > prev_x && cover != last_cover) {
spans[num_spans].x = prev_x;
spans[num_spans].coverage = GRID_AREA_TO_ALPHA (cover);
last_cover = cover;