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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2009-09-03 01:00:59 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2009-09-03 01:00:59 +0100 |
| commit | f1d284f9976d38f636c6791f11479ae75d7bd199 (patch) | |
| tree | c7184ba2bbdad3112ea6cce7ff5501b11e1f61e9 /src/cairo-polygon.c | |
| parent | a6dfdeec82ec34d88276fd0bb0ddcc94405d89f3 (diff) | |
| download | cairo-f1d284f9976d38f636c6791f11479ae75d7bd199.tar.gz | |
[polygon] Fix discard with non-banded disjoint clip boxes
The early discard checked if the line was below the last clip-box, or if
above the first. However, the clip-boxes are only sorted on by the bottom
(not the strict XY-banded sort of the regions) and so this was erroneously
discarding lines.
Diffstat (limited to 'src/cairo-polygon.c')
| -rw-r--r-- | src/cairo-polygon.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/src/cairo-polygon.c b/src/cairo-polygon.c index f3e8e4d20..904b33d37 100644 --- a/src/cairo-polygon.c +++ b/src/cairo-polygon.c @@ -63,8 +63,27 @@ _cairo_polygon_limit (cairo_polygon_t *polygon, const cairo_box_t *limits, int num_limits) { + int n; + polygon->limits = limits; polygon->num_limits = num_limits; + + polygon->limit.p1.x = polygon->limit.p1.y = INT32_MAX; + polygon->limit.p2.x = polygon->limit.p2.y = INT32_MIN; + + for (n = 0; n < num_limits; n++) { + if (limits[n].p1.x < polygon->limit.p1.x) + polygon->limit.p1.x = limits[n].p1.x; + + if (limits[n].p1.y < polygon->limit.p1.y) + polygon->limit.p1.y = limits[n].p1.y; + + if (limits[n].p2.x > polygon->limit.p2.x) + polygon->limit.p2.x = limits[n].p2.x; + + if (limits[n].p2.y > polygon->limit.p2.y) + polygon->limit.p2.y = limits[n].p2.y; + } } void @@ -233,7 +252,7 @@ _add_clipped_edge (cairo_polygon_t *polygon, limits->p2.x); if (left_y == right_y) /* horizontal within bounds */ - return; + continue; p1_y = top; p2_y = bottom; @@ -342,10 +361,10 @@ _cairo_polygon_add_edge (cairo_polygon_t *polygon, } if (polygon->num_limits) { - if (p2->y <= polygon->limits[0].p1.y) + if (p2->y <= polygon->limit.p1.y) return; - if (p1->y >= polygon->limits[polygon->num_limits-1].p2.y) + if (p1->y >= polygon->limit.p2.y) return; _add_clipped_edge (polygon, p1, p2, p1->y, p2->y, dir); @@ -376,10 +395,10 @@ _cairo_polygon_add_line (cairo_polygon_t *polygon, return CAIRO_STATUS_SUCCESS; if (polygon->num_limits) { - if (line->p2.y <= polygon->limits[0].p1.y) + if (line->p2.y <= polygon->limit.p1.y) return CAIRO_STATUS_SUCCESS; - if (line->p1.y >= polygon->limits[polygon->num_limits-1].p2.y) + if (line->p1.y >= polygon->limit.p2.y) return CAIRO_STATUS_SUCCESS; _add_clipped_edge (polygon, &line->p1, &line->p2, top, bottom, dir); |