void
BasicThebesLayerBuffer::DrawTo(ThebesLayer* aLayer,
gfxContext* aTarget,
float aOpacity,
Layer* aMaskLayer)
{
aTarget->Save();
// If the entire buffer is valid, we can just draw the whole thing,
// no need to clip. But we'll still clip if clipping is cheap ---
// that might let us copy a smaller region of the buffer.
// Also clip to the visible region if we're told to.
if (!aLayer->GetValidRegion().Contains(BufferRect()) ||
(ToData(aLayer)->GetClipToVisibleRegion() &&
!aLayer->GetVisibleRegion().Contains(BufferRect())) ||
IsClippingCheap(aTarget, aLayer->GetEffectiveVisibleRegion())) {
// We don't want to draw invalid stuff, so we need to clip. Might as
// well clip to the smallest area possible --- the visible region.
// Bug 599189 if there is a non-integer-translation transform in aTarget,
// we might sample pixels outside GetEffectiveVisibleRegion(), which is wrong
// and may cause gray lines.
gfxUtils::ClipToRegionSnapped(aTarget, aLayer->GetEffectiveVisibleRegion());
}
// Pull out the mask surface and transform here, because the mask
// is internal to basic layers
gfxMatrix maskTransform;
if (nsRefPtr<gfxASurface> maskSurface =
GetMaskSurfaceAndTransform(aMaskLayer, &maskTransform)) {
DrawBufferWithRotation(aTarget, aOpacity, maskSurface, &maskTransform);
} else {
DrawBufferWithRotation(aTarget, aOpacity);
}
aTarget->Restore();
}
void
RotatedContentBuffer::DrawTo(ThebesLayer* aLayer,
gfxContext* aTarget,
float aOpacity,
gfxASurface* aMask,
const gfxMatrix* aMaskTransform)
{
if (!EnsureBuffer()) {
return;
}
RefPtr<DrawTarget> dt = aTarget->GetDrawTarget();
MOZ_ASSERT(dt, "Did you pass a non-Azure gfxContext?");
bool clipped = false;
// If the entire buffer is valid, we can just draw the whole thing,
// no need to clip. But we'll still clip if clipping is cheap ---
// that might let us copy a smaller region of the buffer.
// Also clip to the visible region if we're told to.
if (!aLayer->GetValidRegion().Contains(BufferRect()) ||
(ToData(aLayer)->GetClipToVisibleRegion() &&
!aLayer->GetVisibleRegion().Contains(BufferRect())) ||
IsClippingCheap(aTarget, aLayer->GetEffectiveVisibleRegion())) {
// We don't want to draw invalid stuff, so we need to clip. Might as
// well clip to the smallest area possible --- the visible region.
// Bug 599189 if there is a non-integer-translation transform in aTarget,
// we might sample pixels outside GetEffectiveVisibleRegion(), which is wrong
// and may cause gray lines.
gfxUtils::ClipToRegionSnapped(dt, aLayer->GetEffectiveVisibleRegion());
clipped = true;
}
RefPtr<gfx::SourceSurface> mask;
if (aMask) {
mask = gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(dt, aMask);
}
Matrix maskTransform;
if (aMaskTransform) {
maskTransform = ToMatrix(*aMaskTransform);
}
CompositionOp op = CompositionOpForOp(aTarget->CurrentOperator());
DrawBufferWithRotation(dt, BUFFER_BLACK, aOpacity, op, mask, &maskTransform);
if (clipped) {
dt->PopClip();
}
}
ThebesLayerBuffer::PaintState
ThebesLayerBuffer::BeginPaint(ThebesLayer* aLayer, ContentType aContentType,
PRUint32 aFlags)
{
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 & (PAINT_WILL_RESAMPLE | PAINT_NO_ROTATION));
nsIntRegion validRegion = aLayer->GetValidRegion();
ContentType contentType;
nsIntRegion neededRegion;
bool canReuseBuffer;
nsIntRect destBufferRect;
while (true) {
contentType = aContentType;
neededRegion = aLayer->GetVisibleRegion();
canReuseBuffer = mBuffer && BufferSizeOkFor(neededRegion.GetBounds().Size());
if (canReuseBuffer) {
if (mBufferRect.Contains(neededRegion.GetBounds())) {
// We don't need to adjust mBufferRect.
destBufferRect = mBufferRect;
} else if (neededRegion.GetBounds().Size() <= mBufferRect.Size()) {
// 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();
}
} else {
destBufferRect = neededRegion.GetBounds();
}
if ((aFlags & PAINT_WILL_RESAMPLE) &&
(!neededRegion.GetBounds().IsEqualInterior(destBufferRect) ||
neededRegion.GetNumRects() > 1)) {
// The area we add to neededRegion might not be painted opaquely
contentType = gfxASurface::CONTENT_COLOR_ALPHA;
// We need to validate the entire buffer, to make sure that only valid
// pixels are sampled
neededRegion = destBufferRect;
}
if (mBuffer && contentType != mBuffer->GetContentType()) {
// We're effectively clearing the valid region, so we need to draw
// the entire needed region now.
result.mRegionToInvalidate = aLayer->GetValidRegion();
validRegion.SetEmpty();
Clear();
// Restart decision process with the cleared buffer. We can only go
// around the loop one more iteration, since mBuffer is null now.
continue;
}
break;
}
NS_ASSERTION(destBufferRect.Contains(neededRegion.GetBounds()),
"Destination rect doesn't contain what we need to paint");
result.mRegionToDraw.Sub(neededRegion, validRegion);
if (result.mRegionToDraw.IsEmpty())
return result;
nsIntRect drawBounds = result.mRegionToDraw.GetBounds();
nsRefPtr<gfxASurface> destBuffer;
PRUint32 bufferFlags = canHaveRotation ? ALLOW_REPEAT : 0;
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");
PRInt32 xBoundary = destBufferRect.XMost() - newRotation.x;
PRInt32 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 move the pixels we can keep into a position that
// lets us redraw in just one quadrant.
if (mBufferRotation == nsIntPoint(0,0)) {
nsIntRect srcRect(nsIntPoint(0, 0), mBufferRect.Size());
nsIntPoint dest = mBufferRect.TopLeft() - destBufferRect.TopLeft();
mBuffer->MovePixels(srcRect, dest);
result.mDidSelfCopy = true;
// Don't set destBuffer; we special-case self-copies, and
// just did the necessary work above.
mBufferRect = destBufferRect;
} else {
// We can't do a real self-copy because the buffer is rotated.
// So allocate a new buffer for the destination.
destBufferRect = neededRegion.GetBounds();
destBuffer = CreateBuffer(contentType, destBufferRect.Size(), bufferFlags);
if (!destBuffer)
return result;
}
} 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
destBuffer = CreateBuffer(contentType, destBufferRect.Size(), bufferFlags);
if (!destBuffer)
return result;
}
NS_ASSERTION(!(aFlags & PAINT_WILL_RESAMPLE) || destBufferRect == neededRegion.GetBounds(),
"If we're resampling, we need to validate the entire buffer");
// If we have no buffered data already, then destBuffer will be a fresh buffer
// and we do not need to clear it below.
bool isClear = mBuffer == nsnull;
if (destBuffer) {
if (mBuffer) {
// Copy the bits
nsRefPtr<gfxContext> tmpCtx = new gfxContext(destBuffer);
nsIntPoint offset = -destBufferRect.TopLeft();
tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
tmpCtx->Translate(gfxPoint(offset.x, offset.y));
DrawBufferWithRotation(tmpCtx, 1.0);
}
mBuffer = destBuffer.forget();
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
}
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);
result.mContext = GetContextForQuadrantUpdate(drawBounds);
gfxUtils::ClipToRegionSnapped(result.mContext, result.mRegionToDraw);
if (contentType == gfxASurface::CONTENT_COLOR_ALPHA && !isClear) {
result.mContext->SetOperator(gfxContext::OPERATOR_CLEAR);
result.mContext->Paint();
result.mContext->SetOperator(gfxContext::OPERATOR_OVER);
}
return result;
}
RotatedContentBuffer::PaintState
RotatedContentBuffer::BeginPaint(ThebesLayer* aLayer, ContentType aContentType,
uint32_t aFlags)
{
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 = gfxPlatform::BufferRotationEnabled() &&
!(aFlags & (PAINT_WILL_RESAMPLE | PAINT_NO_ROTATION));
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();
canReuseBuffer = HaveBuffer() && BufferSizeOkFor(neededRegion.GetBounds().Size());
if (canReuseBuffer) {
if (mBufferRect.Contains(neededRegion.GetBounds())) {
// We don't need to adjust mBufferRect.
destBufferRect = mBufferRect;
} else if (neededRegion.GetBounds().Size() <= mBufferRect.Size()) {
// 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();
}
} else {
// We won't be reusing the buffer. Compute a new rect.
destBufferRect = ComputeBufferRect(neededRegion.GetBounds());
}
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
#if defined(MOZ_GFX_OPTIMIZE_MOBILE) || defined(MOZ_WIDGET_GONK)
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
#else
if (!aLayer->GetParent() ||
!aLayer->GetParent()->SupportsComponentAlphaChildren() ||
!aLayer->Manager()->IsCompositingCheap() ||
!aLayer->AsShadowableLayer() ||
!aLayer->AsShadowableLayer()->HasShadow() ||
!gfxPlatform::ComponentAlphaEnabled()) {
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
} else {
contentType = GFX_CONTENT_COLOR;
}
#endif
}
if ((aFlags & 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 = GFX_CONTENT_COLOR_ALPHA;
mode = Layer::SURFACE_SINGLE_CHANNEL_ALPHA;
}
// We need to validate the entire buffer, to make sure that only valid
// pixels are sampled
neededRegion = destBufferRect;
}
// If we have an existing buffer, but the content type has changed or we
// have transitioned into/out of component alpha, then we need to recreate it.
if (HaveBuffer() &&
(contentType != BufferContentType() ||
(mode == Layer::SURFACE_COMPONENT_ALPHA) != HaveBufferOnWhite())) {
// We're effectively clearing the valid region, so we need to draw
// the entire needed region now.
result.mRegionToInvalidate = aLayer->GetValidRegion();
validRegion.SetEmpty();
Clear();
// Restart decision process with the cleared buffer. We can only go
// around the loop one more iteration, since mDTBuffer is null now.
continue;
}
break;
}
NS_ASSERTION(destBufferRect.Contains(neededRegion.GetBounds()),
"Destination rect doesn't contain what we need to paint");
result.mRegionToDraw.Sub(neededRegion, validRegion);
if (result.mRegionToDraw.IsEmpty())
return result;
nsIntRect drawBounds = result.mRegionToDraw.GetBounds();
RefPtr<DrawTarget> destDTBuffer;
RefPtr<DrawTarget> destDTBufferOnWhite;
uint32_t bufferFlags = canHaveRotation ? ALLOW_REPEAT : 0;
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
bufferFlags |= BUFFER_COMPONENT_ALPHA;
}
if (canReuseBuffer) {
if (!EnsureBuffer()) {
return result;
}
nsIntRect keepArea;
if (keepArea.IntersectRect(destBufferRect, mBufferRect)) {
// Set mBufferRotation so that the pixels currently in mDTBuffer
// 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 move the pixels we can keep into a position that
// lets us redraw in just one quadrant.
if (mBufferRotation == nsIntPoint(0,0)) {
nsIntRect srcRect(nsIntPoint(0, 0), mBufferRect.Size());
nsIntPoint dest = mBufferRect.TopLeft() - destBufferRect.TopLeft();
MOZ_ASSERT(mDTBuffer);
mDTBuffer->CopyRect(IntRect(srcRect.x, srcRect.y, srcRect.width, srcRect.height),
IntPoint(dest.x, dest.y));
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
if (!EnsureBufferOnWhite()) {
return result;
}
MOZ_ASSERT(mDTBufferOnWhite);
mDTBufferOnWhite->CopyRect(IntRect(srcRect.x, srcRect.y, srcRect.width, srcRect.height),
IntPoint(dest.x, dest.y));
}
result.mDidSelfCopy = true;
mDidSelfCopy = true;
// Don't set destBuffer; we special-case self-copies, and
// just did the necessary work above.
mBufferRect = destBufferRect;
} else {
// With azure and a data surface perform an buffer unrotate
// (SelfCopy).
unsigned char* data;
IntSize size;
int32_t stride;
SurfaceFormat format;
if (mDTBuffer->LockBits(&data, &size, &stride, &format)) {
uint8_t bytesPerPixel = BytesPerPixel(format);
BufferUnrotate(data,
size.width * bytesPerPixel,
size.height, stride,
newRotation.x * bytesPerPixel, newRotation.y);
mDTBuffer->ReleaseBits(data);
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
if (!EnsureBufferOnWhite()) {
return result;
}
MOZ_ASSERT(mDTBufferOnWhite);
mDTBufferOnWhite->LockBits(&data, &size, &stride, &format);
uint8_t bytesPerPixel = BytesPerPixel(format);
BufferUnrotate(data,
size.width * bytesPerPixel,
size.height, stride,
newRotation.x * bytesPerPixel, newRotation.y);
mDTBufferOnWhite->ReleaseBits(data);
}
// Buffer unrotate moves all the pixels, note that
// we self copied for SyncBackToFrontBuffer
result.mDidSelfCopy = true;
mDidSelfCopy = true;
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0, 0);
}
if (!result.mDidSelfCopy) {
destBufferRect = ComputeBufferRect(neededRegion.GetBounds());
CreateBuffer(contentType, destBufferRect, bufferFlags,
&destDTBuffer, &destDTBufferOnWhite);
if (!destDTBuffer) {
return result;
}
}
}
} 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
CreateBuffer(contentType, destBufferRect, bufferFlags,
&destDTBuffer, &destDTBufferOnWhite);
if (!destDTBuffer) {
return result;
}
}
NS_ASSERTION(!(aFlags & PAINT_WILL_RESAMPLE) || destBufferRect == neededRegion.GetBounds(),
"If we're resampling, we need to validate the entire buffer");
// If we have no buffered data already, then destBuffer will be a fresh buffer
// and we do not need to clear it below.
bool isClear = !HaveBuffer();
if (destDTBuffer) {
if (!isClear && (mode != Layer::SURFACE_COMPONENT_ALPHA || HaveBufferOnWhite())) {
// Copy the bits
nsIntPoint offset = -destBufferRect.TopLeft();
Matrix mat;
mat.Translate(offset.x, offset.y);
destDTBuffer->SetTransform(mat);
if (!EnsureBuffer()) {
return result;
}
MOZ_ASSERT(mDTBuffer, "Have we got a Thebes buffer for some reason?");
DrawBufferWithRotation(destDTBuffer, BUFFER_BLACK, 1.0, OP_SOURCE);
destDTBuffer->SetTransform(Matrix());
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
NS_ASSERTION(destDTBufferOnWhite, "Must have a white buffer!");
destDTBufferOnWhite->SetTransform(mat);
if (!EnsureBufferOnWhite()) {
return result;
}
MOZ_ASSERT(mDTBufferOnWhite, "Have we got a Thebes buffer for some reason?");
DrawBufferWithRotation(destDTBufferOnWhite, BUFFER_WHITE, 1.0, OP_SOURCE);
destDTBufferOnWhite->SetTransform(Matrix());
}
}
mDTBuffer = destDTBuffer.forget();
mDTBufferOnWhite = destDTBufferOnWhite.forget();
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
}
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);
nsIntPoint topLeft;
result.mContext = GetContextForQuadrantUpdate(drawBounds, BUFFER_BOTH, &topLeft);
result.mClip = CLIP_DRAW_SNAPPED;
if (mode == Layer::SURFACE_COMPONENT_ALPHA) {
MOZ_ASSERT(mDTBuffer && mDTBufferOnWhite);
nsIntRegionRectIterator iter(result.mRegionToDraw);
const nsIntRect *iterRect;
while ((iterRect = iter.Next())) {
mDTBuffer->FillRect(Rect(iterRect->x, iterRect->y, iterRect->width, iterRect->height),
ColorPattern(Color(0.0, 0.0, 0.0, 1.0)));
mDTBufferOnWhite->FillRect(Rect(iterRect->x, iterRect->y, iterRect->width, iterRect->height),
ColorPattern(Color(1.0, 1.0, 1.0, 1.0)));
}
} else if (contentType == GFX_CONTENT_COLOR_ALPHA && !isClear) {
nsIntRegionRectIterator iter(result.mRegionToDraw);
const nsIntRect *iterRect;
while ((iterRect = iter.Next())) {
result.mContext->GetDrawTarget()->ClearRect(Rect(iterRect->x, iterRect->y, iterRect->width, iterRect->height));
}
}
return result;
}
ThebesLayerBuffer::PaintState
ThebesLayerBuffer::BeginPaint(ThebesLayer* aLayer, ContentType aContentType)
{
PaintState result;
result.mRegionToDraw.Sub(aLayer->GetVisibleRegion(), aLayer->GetValidRegion());
if (mBuffer && aContentType != mBuffer->GetContentType()) {
// We're effectively clearing the valid region, so we need to draw
// the entire visible region now.
result.mRegionToDraw = aLayer->GetVisibleRegion();
result.mRegionToInvalidate = aLayer->GetValidRegion();
Clear();
}
if (result.mRegionToDraw.IsEmpty())
return result;
nsIntRect drawBounds = result.mRegionToDraw.GetBounds();
nsIntRect visibleBounds = aLayer->GetVisibleRegion().GetBounds();
nsRefPtr<gfxASurface> destBuffer;
nsIntRect destBufferRect;
if (BufferSizeOkFor(visibleBounds.Size())) {
// The current buffer is big enough to hold the visible area.
if (mBufferRect.Contains(visibleBounds)) {
// 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(visibleBounds.TopLeft(), mBufferRect.Size());
}
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");
PRInt32 xBoundary = destBufferRect.XMost() - newRotation.x;
PRInt32 yBoundary = destBufferRect.YMost() - newRotation.y;
if ((drawBounds.x < xBoundary && xBoundary < drawBounds.XMost()) ||
(drawBounds.y < yBoundary && yBoundary < drawBounds.YMost())) {
// 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)) {
destBuffer = mBuffer;
} else {
// We can't do a real self-copy because the buffer is rotated.
// So allocate a new buffer for the destination.
destBufferRect = visibleBounds;
destBuffer = CreateBuffer(aContentType, destBufferRect.Size());
if (!destBuffer)
return result;
}
} 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
destBufferRect = visibleBounds;
destBuffer = CreateBuffer(aContentType, destBufferRect.Size());
if (!destBuffer)
return result;
}
// If we have no buffered data already, then destBuffer will be a fresh buffer
// and we do not need to clear it below.
PRBool isClear = mBuffer == nsnull;
if (destBuffer) {
if (mBuffer) {
// Copy the bits
nsRefPtr<gfxContext> tmpCtx = new gfxContext(destBuffer);
nsIntPoint offset = -destBufferRect.TopLeft();
tmpCtx->SetOperator(gfxContext::OPERATOR_SOURCE);
tmpCtx->Translate(gfxPoint(offset.x, offset.y));
DrawBufferWithRotation(tmpCtx, 1.0);
}
mBuffer = destBuffer.forget();
mBufferRect = destBufferRect;
mBufferRotation = nsIntPoint(0,0);
}
nsIntRegion invalidate;
invalidate.Sub(aLayer->GetValidRegion(), destBufferRect);
result.mRegionToInvalidate.Or(result.mRegionToInvalidate, invalidate);
result.mContext = new gfxContext(mBuffer);
// Figure out which quadrant to draw in
PRInt32 xBoundary = mBufferRect.XMost() - mBufferRotation.x;
PRInt32 yBoundary = mBufferRect.YMost() - mBufferRotation.y;
XSide sideX = drawBounds.XMost() <= xBoundary ? RIGHT : LEFT;
YSide sideY = drawBounds.YMost() <= yBoundary ? BOTTOM : TOP;
nsIntRect quadrantRect = GetQuadrantRectangle(sideX, sideY);
NS_ASSERTION(quadrantRect.Contains(drawBounds), "Messed up quadrants");
result.mContext->Translate(-gfxPoint(quadrantRect.x, quadrantRect.y));
ClipToRegion(result.mContext, result.mRegionToDraw);
if (aContentType == gfxASurface::CONTENT_COLOR_ALPHA && !isClear) {
result.mContext->SetOperator(gfxContext::OPERATOR_CLEAR);
result.mContext->Paint();
result.mContext->SetOperator(gfxContext::OPERATOR_OVER);
}
return result;
}