void
nsShmImage::Put(Display* aDisplay, Drawable aWindow,
const LayoutDeviceIntRegion& aRegion)
{
GC gc = XCreateGC(aDisplay, aWindow, 0, nullptr);
LayoutDeviceIntRegion bounded;
bounded.And(aRegion,
LayoutDeviceIntRect(0, 0, mImage->width, mImage->height));
LayoutDeviceIntRegion::RectIterator iter(bounded);
for (const LayoutDeviceIntRect *r = iter.Next(); r; r = iter.Next()) {
XShmPutImage(aDisplay, aWindow, gc, mImage,
r->x, r->y,
r->x, r->y,
r->width, r->height,
False);
}
XFreeGC(aDisplay, gc);
// FIXME/bug 597336: we need to ensure that the shm image isn't
// scribbled over before all its pending XShmPutImage()s complete.
// However, XSync() is an unnecessarily heavyweight
// synchronization mechanism; other options are possible. If this
// XSync is shown to hurt responsiveness, we need to explore the
// other options.
XSync(aDisplay, False);
}
void
BasicCompositor::BeginFrame(const nsIntRegion& aInvalidRegion,
const gfx::Rect *aClipRectIn,
const gfx::Rect& aRenderBounds,
gfx::Rect *aClipRectOut /* = nullptr */,
gfx::Rect *aRenderBoundsOut /* = nullptr */)
{
LayoutDeviceIntRect intRect(LayoutDeviceIntPoint(), mWidget->GetClientSize());
Rect rect = Rect(0, 0, intRect.width, intRect.height);
LayoutDeviceIntRegion invalidRegionSafe;
if (mDidExternalComposition) {
// We do not know rendered region during external composition, just redraw
// whole widget.
invalidRegionSafe = intRect;
mDidExternalComposition = false;
} else {
// Sometimes the invalid region is larger than we want to draw.
invalidRegionSafe.And(
LayoutDeviceIntRegion::FromUnknownRegion(aInvalidRegion), intRect);
}
mInvalidRegion = invalidRegionSafe;
mInvalidRect = mInvalidRegion.GetBounds();
if (aRenderBoundsOut) {
*aRenderBoundsOut = Rect();
}
BufferMode bufferMode = BufferMode::BUFFERED;
if (mTarget) {
// If we have a copy target, then we don't have a widget-provided mDrawTarget (currently). Use a dummy
// placeholder so that CreateRenderTarget() works.
mDrawTarget = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
} else {
// StartRemoteDrawingInRegion can mutate mInvalidRegion.
mDrawTarget = mWidget->StartRemoteDrawingInRegion(mInvalidRegion, &bufferMode);
if (!mDrawTarget) {
return;
}
mInvalidRect = mInvalidRegion.GetBounds();
if (mInvalidRect.IsEmpty()) {
mWidget->EndRemoteDrawingInRegion(mDrawTarget, mInvalidRegion);
return;
}
}
if (!mDrawTarget || mInvalidRect.IsEmpty()) {
return;
}
// Setup an intermediate render target to buffer all compositing. We will
// copy this into mDrawTarget (the widget), and/or mTarget in EndFrame()
RefPtr<CompositingRenderTarget> target =
CreateRenderTargetForWindow(mInvalidRect.ToUnknownRect(), INIT_MODE_CLEAR, bufferMode);
if (!target) {
if (!mTarget) {
mWidget->EndRemoteDrawingInRegion(mDrawTarget, mInvalidRegion);
}
return;
}
SetRenderTarget(target);
// We only allocate a surface sized to the invalidated region, so we need to
// translate future coordinates.
mRenderTarget->mDrawTarget->SetTransform(Matrix::Translation(-mRenderTarget->GetOrigin()));
gfxUtils::ClipToRegion(mRenderTarget->mDrawTarget,
mInvalidRegion.ToUnknownRegion());
if (aRenderBoundsOut) {
*aRenderBoundsOut = rect;
}
if (aClipRectIn) {
mRenderTarget->mDrawTarget->PushClipRect(*aClipRectIn);
} else {
mRenderTarget->mDrawTarget->PushClipRect(rect);
if (aClipRectOut) {
*aClipRectOut = rect;
}
}
}
