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Redraw glitches on clipped area with shadow when using AGG context

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This commit is contained in:
Airy ANDRE 2011-08-06 10:15:43 +02:00
parent 544115ea12
commit 4c900d975f
1 changed files with 29 additions and 15 deletions
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44
O2Context_AntiGrain/O2Context_AntiGrain.mm
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@ -194,6 +194,10 @@ class context_renderer
float ymin = ren_base->ymin();
float xmax = ren_base->xmax();
float ymax = ren_base->ymax();
if (xmax <= xmin || ymax <= ymin) {
O2Log("Nothing to do - skip shadow blur");
return;
}
// Clip the rect to render - no need to try to blur any clipped area
xmin = max(xmin, x1);
@ -201,14 +205,14 @@ class context_renderer
ymin = max(ymin, y1);
ymax = min(ymax, y2);
xmin = agg::ufloor(xmin);
ymin = agg::ufloor(ymin);
xmax = agg::uceil(xmax);
ymax = agg::uceil(ymax);
xmin = floorf(xmin);
ymin = floorf(ymin);
xmax = ceilf(xmax);
ymax = ceilf(ymax);
// Blur the shadows
if (shadowBlurRadius > 0) {
int radius = agg::uround(shadowBlurRadius);
int radius = agg::iround(shadowBlurRadius);
if (radius > 0) {
// Add the blur radius to the area to blur
xmin -= radius;
xmax += radius;
@ -220,7 +224,11 @@ class context_renderer
O2Log("Shadow: blur shadow - area : ((%.0f,%.0f),(%.0f,%.0f))", xmin, ymin, xmax - xmin, ymax - ymin);
// Stack blur - not really a gaussian one but much faster and good enough
// Blur only the current clipped area - no need to process pixels we won't see
partial_stack_blur_rgba32(*pixelFormatShadow, radius, radius, xmin, xmax, ymin, ymax);
if (xmax > xmin && ymax > ymin) {
partial_stack_blur_rgba32(*pixelFormatShadow, radius, radius, xmin, xmax, ymin, ymax);
} else {
O2Log("Skip blurring");
}
O2Log("Shadow: done blur");
}
@ -232,14 +240,20 @@ class context_renderer
ymax -= shadowOffset.height;
xmin = max(xmin,0);
ymin = max(ymin,0);
xmin = floorf(xmin);
ymin = floorf(ymin);
xmax = ceilf(xmax);
ymax = ceilf(ymax);
xmin = agg::ufloor(xmin);
ymin = agg::ufloor(ymin);
xmax = agg::uceil(xmax);
ymax = agg::uceil(ymax);
r.clip_box(xmin, ymin, xmax, ymax);
// Rasterize the shadow to our main renderer
if (xmax <= xmin || ymax <= ymin) {
O2Log("Nothing to do - skip shadow drawing");
return;
}
r.clip_box(ren_base->xmin(), ren_base->ymin(), ren_base->xmax(), ren_base->ymax());
// Rasterize the shadow to our main renderer
agg::span_allocator<typename pixfmt_shadow_type::color_type> sa;
typedef agg::image_accessor_clone<pixfmt_shadow_type> img_accessor_type;