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Direct2D QPA: Cache QVectorPaths if drawn more than once

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Hooking into the caching mechanism gets us a measurable performance boost
for paths that are drawn repeatedly, around 10% on my machine when drawing
aliased arcs.

Change-Id: I32f4ed7daa8a51b5c5a9c6d5414ab5d4ef759f70
Reviewed-by: Risto Avila <risto.avila@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
This commit is contained in:
Louai Al-Khanji 2014-05-21 13:25:26 +03:00 committed by The Qt Project
parent 5d2939344e
commit 8d7e23ea0b
1 changed files with 43 additions and 6 deletions
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49
src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.cpp
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@ -256,8 +256,30 @@ static ComPtr<ID2D1PathGeometry1> painterPathToID2D1PathGeometry(const QPainterP
return writer.geometry();
}
static ComPtr<ID2D1PathGeometry1> vectorPathToID2D1PathGeometry(const QVectorPath &path, bool alias)
struct D2DVectorPathCache {
ComPtr<ID2D1PathGeometry1> aliased;
ComPtr<ID2D1PathGeometry1> antiAliased;
static void cleanup_func(QPaintEngineEx *engine, void *data) {
Q_UNUSED(engine);
D2DVectorPathCache *e = static_cast<D2DVectorPathCache *>(data);
delete e;
}
};
static ComPtr<ID2D1PathGeometry1> vectorPathToID2D1PathGeometry(const QVectorPath &path, bool alias, QPaintEngineEx* engine)
{
QVectorPath::CacheEntry *cacheEntry = path.isCacheable() ? path.lookupCacheData(engine)
: Q_NULLPTR;
if (cacheEntry) {
D2DVectorPathCache *e = static_cast<D2DVectorPathCache *>(cacheEntry->data);
if (alias && e->aliased)
return e->aliased;
else if (!alias && e->antiAliased)
return e->antiAliased;
}
Direct2DPathGeometryWriter writer;
if (!writer.begin())
return NULL;
@ -321,7 +343,22 @@ static ComPtr<ID2D1PathGeometry1> vectorPathToID2D1PathGeometry(const QVectorPat
writer.lineTo(QPointF(points[0], points[1]));
writer.close();
return writer.geometry();
ComPtr<ID2D1PathGeometry1> geometry = writer.geometry();
if (path.isCacheable()) {
if (!cacheEntry)
cacheEntry = path.addCacheData(engine, new D2DVectorPathCache, D2DVectorPathCache::cleanup_func);
D2DVectorPathCache *e = static_cast<D2DVectorPathCache *>(cacheEntry->data);
if (alias)
e->aliased = geometry;
else
e->antiAliased = geometry;
} else {
path.makeCacheable();
}
return geometry;
}
class QWindowsDirect2DPaintEnginePrivate : public QPaintEngineExPrivate
@ -426,7 +463,7 @@ public:
dc()->PushAxisAlignedClip(rect, antialiasMode());
pushedClips.push(AxisAlignedClip);
} else {
ComPtr<ID2D1PathGeometry1> geometry = vectorPathToID2D1PathGeometry(path, antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED);
ComPtr<ID2D1PathGeometry1> geometry = vectorPathToID2D1PathGeometry(path, antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED, q);
if (!geometry) {
qWarning("%s: Could not convert vector path to painter path!", __FUNCTION__);
return;
@ -938,7 +975,7 @@ void QWindowsDirect2DPaintEngine::draw(const QVectorPath &path)
{
Q_D(QWindowsDirect2DPaintEngine);
ComPtr<ID2D1Geometry> geometry = vectorPathToID2D1PathGeometry(path, d->antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED);
ComPtr<ID2D1Geometry> geometry = vectorPathToID2D1PathGeometry(path, d->antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED, this);
if (!geometry) {
qWarning("%s: Could not convert path to d2d geometry", __FUNCTION__);
return;
@ -978,7 +1015,7 @@ void QWindowsDirect2DPaintEngine::fill(const QVectorPath &path, const QBrush &br
if (!d->brush.brush)
return;
ComPtr<ID2D1Geometry> geometry = vectorPathToID2D1PathGeometry(path, d->antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED);
ComPtr<ID2D1Geometry> geometry = vectorPathToID2D1PathGeometry(path, d->antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED, this);
if (!geometry) {
qWarning("%s: Could not convert path to d2d geometry", __FUNCTION__);
return;
@ -1016,7 +1053,7 @@ void QWindowsDirect2DPaintEngine::stroke(const QVectorPath &path, const QPen &pe
if (!d->pen.brush)
return;
ComPtr<ID2D1Geometry> geometry = vectorPathToID2D1PathGeometry(path, d->antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED);
ComPtr<ID2D1Geometry> geometry = vectorPathToID2D1PathGeometry(path, d->antialiasMode() == D2D1_ANTIALIAS_MODE_ALIASED, this);
if (!geometry) {
qWarning("%s: Could not convert path to d2d geometry", __FUNCTION__);
return;