DrawTarget*
ContentClientIncremental::BorrowDrawTargetForPainting(const PaintState& aPaintState,
RotatedContentBuffer::DrawIterator* aIter)
{
if (aPaintState.mMode == SurfaceMode::SURFACE_NONE) {
return nullptr;
}
if (aIter) {
if (aIter->mCount++ > 0) {
return nullptr;
}
aIter->mDrawRegion = aPaintState.mRegionToDraw;
}
DrawTarget* result = nullptr;
nsIntRect drawBounds = aPaintState.mRegionToDraw.GetBounds();
MOZ_ASSERT(!mLoanedDrawTarget);
// BeginUpdate is allowed to modify the given region,
// if it wants more to be repainted than we request.
if (aPaintState.mMode == SurfaceMode::SURFACE_COMPONENT_ALPHA) {
nsIntRegion drawRegionCopy = aPaintState.mRegionToDraw;
RefPtr<DrawTarget> onBlack = GetUpdateSurface(BUFFER_BLACK, drawRegionCopy);
RefPtr<DrawTarget> onWhite = GetUpdateSurface(BUFFER_WHITE, aPaintState.mRegionToDraw);
if (onBlack && onWhite) {
NS_ASSERTION(aPaintState.mRegionToDraw == drawRegionCopy,
"BeginUpdate should always modify the draw region in the same way!");
FillSurface(onBlack, aPaintState.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(0.0, 0.0, 0.0, 1.0));
FillSurface(onWhite, aPaintState.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(1.0, 1.0, 1.0, 1.0));
mLoanedDrawTarget = Factory::CreateDualDrawTarget(onBlack, onWhite);
} else {
mLoanedDrawTarget = nullptr;
}
} else {
mLoanedDrawTarget = GetUpdateSurface(BUFFER_BLACK, aPaintState.mRegionToDraw);
}
if (!mLoanedDrawTarget) {
NS_WARNING("unable to get context for update");
return nullptr;
}
result = mLoanedDrawTarget;
mLoanedTransform = mLoanedDrawTarget->GetTransform();
mLoanedTransform.Translate(-drawBounds.x, -drawBounds.y);
result->SetTransform(mLoanedTransform);
mLoanedTransform.Translate(drawBounds.x, drawBounds.y);
if (mContentType == gfxContentType::COLOR_ALPHA) {
gfxUtils::ClipToRegion(result, aPaintState.mRegionToDraw);
nsIntRect bounds = aPaintState.mRegionToDraw.GetBounds();
result->ClearRect(Rect(bounds.x, bounds.y, bounds.width, bounds.height));
}
return result;
}
ThebesLayerBuffer::PaintState
ContentClientIncremental::BeginPaintBuffer(ThebesLayer* aLayer,
ThebesLayerBuffer::ContentType aContentType,
uint32_t aFlags)
{
mTextureInfo.mDeprecatedTextureHostFlags = 0;
PaintState result;
// We need to disable rotation if we're going to be resampled when
// drawing, because we might sample across the rotation boundary.
bool canHaveRotation = !(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE);
nsIntRegion validRegion = aLayer->GetValidRegion();
Layer::SurfaceMode mode;
ContentType contentType;
nsIntRegion neededRegion;
bool canReuseBuffer;
nsIntRect destBufferRect;
while (true) {
mode = aLayer->GetSurfaceMode();
contentType = aContentType;
neededRegion = aLayer->GetVisibleRegion();
// If we're going to resample, we need a buffer that's in clamp mode.
canReuseBuffer = neededRegion.GetBounds().Size() <= mBufferRect.Size() &&
mHasBuffer &&
(!(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) ||
!(mTextureInfo.mTextureFlags & TEXTURE_ALLOW_REPEAT));
if (canReuseBuffer) {
if (mBufferRect.Contains(neededRegion.GetBounds())) {
// We don't need to adjust mBufferRect.
destBufferRect = mBufferRect;
} else {
// The buffer's big enough but doesn't contain everything that's
// going to be visible. We'll move it.
destBufferRect = nsIntRect(neededRegion.GetBounds().TopLeft(), mBufferRect.Size());
}
} else {
destBufferRect = neededRegion.GetBounds();
}
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
if (!gfxPlatform::ComponentAlphaEnabled() ||
!aLayer->GetParent() ||
!aLayer->GetParent()->SupportsComponentAlphaChildren()) {
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
} else {
contentType = gfxASurface::CONTENT_COLOR;
}
}
if ((aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) &&
(!neededRegion.GetBounds().IsEqualInterior(destBufferRect) ||
neededRegion.GetNumRects() > 1)) {
// The area we add to neededRegion might not be painted opaquely
if (mode == Layer::SURFACE_OPAQUE) {
contentType = gfxASurface::CONTENT_COLOR_ALPHA;
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
}
// For component alpha layers, we leave contentType as CONTENT_COLOR.
// We need to validate the entire buffer, to make sure that only valid
// pixels are sampled
neededRegion = destBufferRect;
}
if (mHasBuffer &&
(mContentType != contentType ||
(mode == Layer::SURFACE_COMPONENT_ALPHA) != mHasBufferOnWhite)) {
// We're effectively clearing the valid region, so we need to draw
// the entire needed region now.
result.mRegionToInvalidate = aLayer->GetValidRegion();
validRegion.SetEmpty();
mHasBuffer = false;
mHasBufferOnWhite = false;
mBufferRect.SetRect(0, 0, 0, 0);
mBufferRotation.MoveTo(0, 0);
// Restart decision process with the cleared buffer. We can only go
// around the loop one more iteration, since mTexImage is null now.
continue;
}
break;
}
result.mRegionToDraw.Sub(neededRegion, validRegion);
if (result.mRegionToDraw.IsEmpty())
return result;
if (destBufferRect.width > mForwarder->GetMaxTextureSize() ||
destBufferRect.height > mForwarder->GetMaxTextureSize()) {
return result;
}
// BlitTextureImage depends on the FBO texture target being
// TEXTURE_2D. This isn't the case on some older X1600-era Radeons.
if (!mForwarder->SupportsTextureBlitting() ||
!mForwarder->SupportsPartialUploads()) {
result.mRegionToDraw = neededRegion;
validRegion.SetEmpty();
mHasBuffer = false;
mHasBufferOnWhite = false;
mBufferRect.SetRect(0, 0, 0, 0);
mBufferRotation.MoveTo(0, 0);
canReuseBuffer = false;
}
nsIntRect drawBounds = result.mRegionToDraw.GetBounds();
bool createdBuffer = false;
uint32_t bufferFlags = canHaveRotation ? TEXTURE_ALLOW_REPEAT : 0;
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
bufferFlags |= TEXTURE_COMPONENT_ALPHA;
}
if (canReuseBuffer) {
nsIntRect keepArea;
if (keepArea.IntersectRect(destBufferRect, mBufferRect)) {
// Set mBufferRotation so that the pixels currently in mBuffer
// will still be rendered in the right place when mBufferRect
// changes to destBufferRect.
nsIntPoint newRotation = mBufferRotation +
(destBufferRect.TopLeft() - mBufferRect.TopLeft());
WrapRotationAxis(&newRotation.x, mBufferRect.width);
WrapRotationAxis(&newRotation.y, mBufferRect.height);
NS_ASSERTION(nsIntRect(nsIntPoint(0,0), mBufferRect.Size()).Contains(newRotation),
"newRotation out of bounds");
int32_t xBoundary = destBufferRect.XMost() - newRotation.x;
int32_t yBoundary = destBufferRect.YMost() - newRotation.y;
if ((drawBounds.x < xBoundary && xBoundary < drawBounds.XMost()) ||
(drawBounds.y < yBoundary && yBoundary < drawBounds.YMost()) ||
(newRotation != nsIntPoint(0,0) && !canHaveRotation)) {
// The stuff we need to redraw will wrap around an edge of the
// buffer, so we will need to do a self-copy
// If mBufferRotation == nsIntPoint(0,0) we could do a real
// self-copy but we're not going to do that in GL yet.
// We can't do a real self-copy because the buffer is rotated.
// So allocate a new buffer for the destination.
destBufferRect = neededRegion.GetBounds();
createdBuffer = true;
} else {
mBufferRect = destBufferRect;
mBufferRotation = newRotation;
}
} else {
// No pixels are going to be kept. The whole visible region
// will be redrawn, so we don't need to copy anything, so we don't
// set destBuffer.
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
}
} else {
// The buffer's not big enough, so allocate a new one
createdBuffer = true;
}
NS_ASSERTION(!(aFlags & ThebesLayerBuffer::PAINT_WILL_RESAMPLE) ||
destBufferRect == neededRegion.GetBounds(),
"If we're resampling, we need to validate the entire buffer");
if (!createdBuffer && !mHasBuffer) {
return result;
}
if (createdBuffer) {
if (mHasBuffer &&
(mode != Layer::SURFACE_COMPONENT_ALPHA || mHasBufferOnWhite)) {
mTextureInfo.mDeprecatedTextureHostFlags = TEXTURE_HOST_COPY_PREVIOUS;
}
mHasBuffer = true;
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
mHasBufferOnWhite = true;
}
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
NotifyBufferCreated(contentType, bufferFlags);
}
NS_ASSERTION(canHaveRotation || mBufferRotation == nsIntPoint(0,0),
"Rotation disabled, but we have nonzero rotation?");
nsIntRegion invalidate;
invalidate.Sub(aLayer->GetValidRegion(), destBufferRect);
result.mRegionToInvalidate.Or(result.mRegionToInvalidate, invalidate);
// BeginUpdate is allowed to modify the given region,
// if it wants more to be repainted than we request.
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
nsIntRegion drawRegionCopy = result.mRegionToDraw;
nsRefPtr<gfxASurface> onBlack = GetUpdateSurface(BUFFER_BLACK, drawRegionCopy);
nsRefPtr<gfxASurface> onWhite = GetUpdateSurface(BUFFER_WHITE, result.mRegionToDraw);
if (onBlack && onWhite) {
NS_ASSERTION(result.mRegionToDraw == drawRegionCopy,
"BeginUpdate should always modify the draw region in the same way!");
FillSurface(onBlack, result.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(0.0, 0.0, 0.0, 1.0));
FillSurface(onWhite, result.mRegionToDraw, nsIntPoint(drawBounds.x, drawBounds.y), gfxRGBA(1.0, 1.0, 1.0, 1.0));
if (RefPtr<DrawTarget> onBlackDT = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(onBlack, onBlack->GetSize())) {
RefPtr<DrawTarget> onWhiteDT = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(onWhite, onWhite->GetSize());
RefPtr<DrawTarget> dt = Factory::CreateDualDrawTarget(onBlackDT, onWhiteDT);
result.mContext = new gfxContext(dt);
} else {
gfxASurface* surfaces[2] = { onBlack.get(), onWhite.get() };
nsRefPtr<gfxTeeSurface> surf = new gfxTeeSurface(surfaces, ArrayLength(surfaces));
// XXX If the device offset is set on the individual surfaces instead of on
// the tee surface, we render in the wrong place. Why?
gfxPoint deviceOffset = onBlack->GetDeviceOffset();
onBlack->SetDeviceOffset(gfxPoint(0, 0));
onWhite->SetDeviceOffset(gfxPoint(0, 0));
surf->SetDeviceOffset(deviceOffset);
// Using this surface as a source will likely go horribly wrong, since
// only the onBlack surface will really be used, so alpha information will
// be incorrect.
surf->SetAllowUseAsSource(false);
result.mContext = new gfxContext(surf);
}
} else {
result.mContext = nullptr;
}
} else {
nsRefPtr<gfxASurface> surf = GetUpdateSurface(BUFFER_BLACK, result.mRegionToDraw);
if (RefPtr<DrawTarget> dt = gfxPlatform::GetPlatform()->CreateDrawTargetForUpdateSurface(surf, surf->GetSize())) {
result.mContext = new gfxContext(dt);
} else {
result.mContext = new gfxContext(surf);
}
}
if (!result.mContext) {
NS_WARNING("unable to get context for update");
return result;
}
result.mContext->Translate(-gfxPoint(drawBounds.x, drawBounds.y));
// If we do partial updates, we have to clip drawing to the regionToDraw.
// If we don't clip, background images will be fillrect'd to the region correctly,
// while text or lines will paint outside of the regionToDraw. This becomes apparent
// with concave regions. Right now the scrollbars invalidate a narrow strip of the bar
// although they never cover it. This leads to two draw rects, the narow strip and the actually
// newly exposed area. It would be wise to fix this glitch in any way to have simpler
// clip and draw regions.
gfxUtils::ClipToRegion(result.mContext, result.mRegionToDraw);
if (mContentType == gfxASurface::CONTENT_COLOR_ALPHA) {
result.mContext->SetOperator(gfxContext::OPERATOR_CLEAR);
result.mContext->Paint();
result.mContext->SetOperator(gfxContext::OPERATOR_OVER);
}
return result;
}
