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From 0d7f05ed99b71a4641415c9f26e245c3bb24a9a0 Mon Sep 17 00:00:00 2001
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From: Adam Jackson <ajax@redhat.com>
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Date: Wed, 1 Mar 2017 16:13:59 -0500
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Subject: [PATCH 3/3] miarc: "Cache" arc span data for dashed arcs
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This avoids recomputing the span data for every dash. x11perf thinks
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this is a pretty modest speedup:
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832919.4 840471.1 ( 1.009) 100-pixel dashed ellipse
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672353.1 680652.2 ( 1.012) 100-pixel double-dashed ellipse
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13748.9 24287.9 ( 1.767) 100-pixel wide dashed ellipse
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9236.3 21298.2 ( 2.306) 100-pixel wide double-dashed ellipse
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But part of the reason it's so modest there is that the arcs are
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relatively small (100 pixel diameter at line width 10, so ~6000 pixels)
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and the dashes relatively large (30 on 20 off so ~6 dashes per
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quadrant).
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With larger arcs and finer dashes this is much more impressive. A fairly
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trivial testcase of a single 15000x13000 arc with the default {2, 2}
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dash pattern drops from ~3500 milliseconds to 10 milliseconds.
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Reviewed-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Adam Jackson <ajax@redhat.com>
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---
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mi/miarc.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/mi/miarc.c b/mi/miarc.c
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index d6be99000..71df4ab64 100644
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--- a/mi/miarc.c
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+++ b/mi/miarc.c
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@@ -1021,6 +1021,7 @@ miWideArc(DrawablePtr pDraw, GCPtr pGC, int narcs, xArc * parcs)
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join[0] = join[1] = 0;
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for (iphase = (pGC->lineStyle == LineDoubleDash); iphase >= 0; iphase--) {
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miArcSpanData *spdata = NULL;
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+ xArc lastArc;
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ChangeGCVal gcval;
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if (iphase == 1) {
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@@ -1037,10 +1038,17 @@ miWideArc(DrawablePtr pDraw, GCPtr pGC, int narcs, xArc * parcs)
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miArcDataPtr arcData;
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arcData = &polyArcs[iphase].arcs[i];
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+ if (spdata) {
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+ if (lastArc.width != arcData->arc.width ||
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+ lastArc.height != arcData->arc.height) {
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+ free(spdata);
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+ spdata = NULL;
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+ }
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+ }
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+ memcpy(&lastArc, &arcData->arc, sizeof(xArc));
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spdata = miArcSegment(pDrawTo, pGCTo, arcData->arc,
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&arcData->bounds[RIGHT_END],
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&arcData->bounds[LEFT_END], spdata);
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- free(spdata);
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if (polyArcs[iphase].arcs[i].render) {
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fillSpans(pDrawTo, pGCTo);
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/* don't cap self-joining arcs */
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@@ -1097,6 +1105,8 @@ miWideArc(DrawablePtr pDraw, GCPtr pGC, int narcs, xArc * parcs)
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}
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}
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}
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+ free(spdata);
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+ spdata = NULL;
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}
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miFreeArcs(polyArcs, pGC);
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--
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2.12.0
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