void
GradientStopsView::UpdateView()
{
DrawTarget *dt = ui->dtWidget->GetDT();
dt->FillRect(Rect(0, 0, 100000, 100000), ColorPattern(Color(0.5f, 0.5f, 0.5f, 1.0f)));
RefPtr<GradientStops> stops = mTranslator->LookupGradientStops(mRefPtr);
ui->listWidget->clear();
if (!stops) {
dt->Flush();
ui->dtWidget->redraw();
ui->listWidget->addItem("Dead");
return;
}
IntSize dstSize = dt->GetSize();
RefPtr<DrawTarget> tmpdt = dt->CreateSimilarDrawTarget(IntSize(20, 20), SurfaceFormat::B8G8R8X8);
tmpdt->FillRect(Rect(0, 0, 10, 10), ColorPattern(Color(1.0f, 1.0f, 1.0f)));
tmpdt->FillRect(Rect(10, 10, 10, 10), ColorPattern(Color(1.0f, 1.0f, 1.0f)));
tmpdt->FillRect(Rect(10, 0, 10, 10), ColorPattern(Color(0.7f, 0.7f, 0.7f)));
tmpdt->FillRect(Rect(0, 10, 10, 10), ColorPattern(Color(0.7f, 0.7f, 0.7f)));
RefPtr<SourceSurface> src = tmpdt->Snapshot();
tmpdt = NULL;
Rect dstRect(0, 0, dstSize.width, dstSize.height);
dt->FillRect(dstRect, SurfacePattern(src, ExtendMode::REPEAT));
dt->FillRect(dstRect, LinearGradientPattern(Point(0, dstSize.height / 2), Point(dstSize.width, dstSize.height / 2), stops));
dt->Flush();
ui->dtWidget->redraw();
}
/***
* If we can, let's paint this ClientPaintedLayer's contents off the main thread.
* The essential idea is that we ask the ContentClient for a DrawTarget and record
* the moz2d commands. On the Paint Thread, we replay those commands to the
* destination draw target. There are a couple of lifetime issues here though:
*
* 1) TextureClient owns the underlying buffer and DrawTarget. Because of this
* we have to keep the TextureClient and DrawTarget alive but trick the
* TextureClient into thinking it's already returned the DrawTarget
* since we iterate through different Rects to get DrawTargets*. If
* the TextureClient goes away, the DrawTarget and thus buffer can too.
* 2) When ContentClient::EndPaint happens, it flushes the DrawTarget. We have
* to Reflush on the Paint Thread
* 3) DrawTarget API is NOT thread safe. We get around this by recording
* on the main thread and painting on the paint thread. Logically,
* ClientLayerManager will force a flushed paint and block the main thread
* if we have another transaction. Thus we have a gap between when the main
* thread records, the paint thread paints, and we block the main thread
* from trying to paint again. The underlying API however is NOT thread safe.
* 4) We have both "sync" and "async" OMTP. Sync OMTP means we paint on the main thread
* but block the main thread while the paint thread paints. Async OMTP doesn't block
* the main thread. Sync OMTP is only meant to be used as a debugging tool.
*/
bool
ClientPaintedLayer::PaintOffMainThread()
{
mContentClient->BeginAsyncPaint();
uint32_t flags = GetPaintFlags();
PaintState state = mContentClient->BeginPaintBuffer(this, flags);
if (!UpdatePaintRegion(state)) {
return false;
}
bool didUpdate = false;
RotatedContentBuffer::DrawIterator iter;
// Debug Protip: Change to BorrowDrawTargetForPainting if using sync OMTP.
while (RefPtr<CapturedPaintState> captureState =
mContentClient->BorrowDrawTargetForRecording(state, &iter))
{
DrawTarget* target = captureState->mTarget;
if (!target || !target->IsValid()) {
if (target) {
mContentClient->ReturnDrawTargetToBuffer(target);
}
continue;
}
RefPtr<DrawTargetCapture> captureDT =
Factory::CreateCaptureDrawTarget(target->GetBackendType(),
target->GetSize(),
target->GetFormat());
captureDT->SetTransform(captureState->mTargetTransform);
SetAntialiasingFlags(this, captureDT);
RefPtr<gfxContext> ctx = gfxContext::CreatePreservingTransformOrNull(captureDT);
MOZ_ASSERT(ctx); // already checked the target above
ClientManager()->GetPaintedLayerCallback()(this,
ctx,
iter.mDrawRegion,
iter.mDrawRegion,
state.mClip,
state.mRegionToInvalidate,
ClientManager()->GetPaintedLayerCallbackData());
ctx = nullptr;
captureState->mCapture = captureDT.forget();
PaintThread::Get()->PaintContents(captureState,
RotatedContentBuffer::PrepareDrawTargetForPainting);
mContentClient->ReturnDrawTargetToBuffer(target);
didUpdate = true;
}
mContentClient->EndPaint(nullptr);
if (didUpdate) {
UpdateContentClient(state);
}
return true;
}