gecko/gfx/layers/ipc/ShadowLayerUtilsX11.cpp
2011-10-17 10:59:28 -04:00

198 lines
6.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Code.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
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* the provisions above, a recipient may use your version of this file under
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* ***** END LICENSE BLOCK ***** */
#include "mozilla/layers/PLayers.h"
#include "mozilla/layers/ShadowLayers.h"
#include "gfxPlatform.h"
#include "gfxXlibSurface.h"
#include "mozilla/X11Util.h"
namespace mozilla {
namespace layers {
// Return true if we're likely compositing using X and so should use
// Xlib surfaces in shadow layers.
static bool
UsingXCompositing()
{
return (gfxASurface::SurfaceTypeXlib ==
gfxPlatform::GetPlatform()->ScreenReferenceSurface()->GetType());
}
// LookReturn a pointer to |aFormat| that lives in the Xrender library.
// All code using render formats assumes it doesn't need to copy.
static XRenderPictFormat*
GetXRenderPictFormatFromId(Display* aDisplay, PictFormat aFormatId)
{
XRenderPictFormat tmplate;
tmplate.id = aFormatId;
return XRenderFindFormat(aDisplay, PictFormatID, &tmplate, 0);
}
static bool
TakeAndDestroyXlibSurface(SurfaceDescriptor* aSurface)
{
nsRefPtr<gfxXlibSurface> surf =
aSurface->get_SurfaceDescriptorX11().OpenForeign();
surf->TakePixmap();
*aSurface = SurfaceDescriptor();
// the Pixmap is destroyed when |surf| goes out of scope
return true;
}
SurfaceDescriptorX11::SurfaceDescriptorX11(gfxXlibSurface* aSurf)
: mId(aSurf->XDrawable())
, mSize(aSurf->GetSize())
, mFormat(aSurf->XRenderFormat()->id)
{ }
SurfaceDescriptorX11::SurfaceDescriptorX11(const int aXid, const int aXrenderPictID, const gfxIntSize& aSize)
: mId(aXid)
, mSize(aSize)
, mFormat(aXrenderPictID)
{ }
already_AddRefed<gfxXlibSurface>
SurfaceDescriptorX11::OpenForeign() const
{
Display* display = DefaultXDisplay();
Screen* screen = DefaultScreenOfDisplay(display);
XRenderPictFormat* format = GetXRenderPictFormatFromId(display, mFormat);
nsRefPtr<gfxXlibSurface> surf =
new gfxXlibSurface(screen, mId, format, mSize);
return surf->CairoStatus() ? nsnull : surf.forget();
}
bool
ShadowLayerForwarder::PlatformAllocDoubleBuffer(const gfxIntSize& aSize,
gfxASurface::gfxContentType aContent,
SurfaceDescriptor* aFrontBuffer,
SurfaceDescriptor* aBackBuffer)
{
return (PlatformAllocBuffer(aSize, aContent, aFrontBuffer) &&
PlatformAllocBuffer(aSize, aContent, aBackBuffer));
}
bool
ShadowLayerForwarder::PlatformAllocBuffer(const gfxIntSize& aSize,
gfxASurface::gfxContentType aContent,
SurfaceDescriptor* aBuffer)
{
if (!UsingXCompositing()) {
// If we're not using X compositing, we're probably compositing on
// the client side, in which case X surfaces would just slow
// things down. Use Shmem instead.
return false;
}
gfxPlatform* platform = gfxPlatform::GetPlatform();
nsRefPtr<gfxASurface> buffer = platform->CreateOffscreenSurface(aSize, aContent);
if (!buffer ||
buffer->GetType() != gfxASurface::SurfaceTypeXlib) {
NS_ERROR("creating Xlib front/back surfaces failed!");
return false;
}
gfxXlibSurface* bufferX = static_cast<gfxXlibSurface*>(buffer.get());
// Release Pixmap ownership to the layers model
bufferX->ReleasePixmap();
*aBuffer = SurfaceDescriptorX11(bufferX);
return true;
}
/*static*/ already_AddRefed<gfxASurface>
ShadowLayerForwarder::PlatformOpenDescriptor(const SurfaceDescriptor& aSurface)
{
if (SurfaceDescriptor::TSurfaceDescriptorX11 != aSurface.type()) {
return nsnull;
}
return aSurface.get_SurfaceDescriptorX11().OpenForeign();
}
bool
ShadowLayerForwarder::PlatformDestroySharedSurface(SurfaceDescriptor* aSurface)
{
if (SurfaceDescriptor::TSurfaceDescriptorX11 != aSurface->type()) {
return false;
}
return TakeAndDestroyXlibSurface(aSurface);
}
/*static*/ void
ShadowLayerForwarder::PlatformSyncBeforeUpdate()
{
if (UsingXCompositing()) {
// If we're using X surfaces, then we need to finish all pending
// operations on the back buffers before handing them to the
// parent, otherwise the surface might be used by the parent's
// Display in between two operations queued by our Display.
XSync(DefaultXDisplay(), False);
}
}
/*static*/ void
ShadowLayerManager::PlatformSyncBeforeReplyUpdate()
{
if (UsingXCompositing()) {
// If we're using X surfaces, we need to finish all pending
// operations on the *front buffers* before handing them back to
// the child, even though they will be read operations.
// Otherwise, the child might start scribbling on new back buffers
// that are still participating in requests as old front buffers.
XSync(DefaultXDisplay(), False);
}
}
bool
ShadowLayerManager::PlatformDestroySharedSurface(SurfaceDescriptor* aSurface)
{
if (SurfaceDescriptor::TSurfaceDescriptorX11 != aSurface->type()) {
return false;
}
return TakeAndDestroyXlibSurface(aSurface);
}
} // namespace layers
} // namespace mozilla