gecko/gfx/layers/ipc/ShadowLayerUtilsX11.cpp
2012-07-12 05:51:57 -07:00

189 lines
5.8 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=8 et :
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/layers/PLayers.h"
#include "mozilla/layers/ShadowLayers.h"
#include "gfxPlatform.h"
#include "gfxXlibSurface.h"
#include "mozilla/X11Util.h"
#include "cairo-xlib.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())
{
const XRenderPictFormat *pictFormat = aSurf->XRenderFormat();
if (pictFormat) {
mFormat = pictFormat->id;
} else {
mFormat = cairo_xlib_surface_get_visual(aSurf->CairoSurface())->visualid;
}
}
SurfaceDescriptorX11::SurfaceDescriptorX11(Drawable aDrawable, XID aFormatID,
const gfxIntSize& aSize)
: mId(aDrawable)
, mFormat(aFormatID)
, mSize(aSize)
{ }
already_AddRefed<gfxXlibSurface>
SurfaceDescriptorX11::OpenForeign() const
{
Display* display = DefaultXDisplay();
Screen* screen = DefaultScreenOfDisplay(display);
nsRefPtr<gfxXlibSurface> surf;
XRenderPictFormat* pictFormat = GetXRenderPictFormatFromId(display, mFormat);
if (pictFormat) {
surf = new gfxXlibSurface(screen, mId, pictFormat, mSize);
} else {
Visual* visual = NULL;
unsigned int depth;
XVisualIDToInfo(display, mFormat, &visual, &depth);
if (!visual)
return nsnull;
surf = new gfxXlibSurface(display, mId, visual, mSize);
}
return surf->CairoStatus() ? nsnull : surf.forget();
}
bool
ShadowLayerForwarder::PlatformAllocDoubleBuffer(const gfxIntSize& aSize,
gfxASurface::gfxContentType aContent,
SurfaceDescriptor* aFrontBuffer,
SurfaceDescriptor* aBackBuffer)
{
return (PlatformAllocBuffer(aSize, aContent, DEFAULT_BUFFER_CAPS, aFrontBuffer) &&
PlatformAllocBuffer(aSize, aContent, DEFAULT_BUFFER_CAPS, aBackBuffer));
}
bool
ShadowLayerForwarder::PlatformAllocBuffer(const gfxIntSize& aSize,
gfxASurface::gfxContentType aContent,
uint32_t aCaps,
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;
}
if (MAP_AS_IMAGE_SURFACE & aCaps) {
// We can't efficiently map pixmaps as gfxImageSurface, in
// general. Fall back on Shmem.
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