gecko-dev/gfx/thebes/gfxSharedImageSurface.cpp

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// vim:set ts=4 sts=4 sw=4 et cin:
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** 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 Nokia Corporation code.
*
* The Initial Developer of the Original Code is Nokia Corporation.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Oleg Romashin <romaxa@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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* 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
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
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*
* ***** END LICENSE BLOCK ***** */
#include "base/basictypes.h"
#include "gfxSharedImageSurface.h"
#include "cairo.h"
#define MOZ_ALIGN_WORD(x) (((x) + 3) & ~3)
using mozilla::ipc::SharedMemory;
static cairo_user_data_key_t SHM_KEY;
typedef struct _SharedImageInfo
{
PRInt32 width;
PRInt32 height;
PRInt32 format;
} SharedImageInfo;
static SharedImageInfo*
GetShmInfoPtr(const mozilla::ipc::Shmem &aShmem)
{
return reinterpret_cast<SharedImageInfo*>
(aShmem.get<char>() + aShmem.Size<char>() - sizeof(SharedImageInfo));
}
size_t
gfxSharedImageSurface::GetAlignedSize()
{
return MOZ_ALIGN_WORD(sizeof(SharedImageInfo) + mSize.height * mStride);
}
bool
gfxSharedImageSurface::InitSurface(PRBool aUpdateShmemInfo)
{
if (!CheckSurfaceSize(mSize))
return false;
cairo_surface_t *surface =
cairo_image_surface_create_for_data(mShmem.get<unsigned char>(),
(cairo_format_t)mFormat,
mSize.width,
mSize.height,
mStride);
if (!surface)
return false;
cairo_surface_set_user_data(surface,
&SHM_KEY,
this, NULL);
if (aUpdateShmemInfo) {
SharedImageInfo *shmInfo = GetShmInfoPtr(mShmem);
shmInfo->width = mSize.width;
shmInfo->height = mSize.height;
shmInfo->format = mFormat;
}
InitFromSurface(surface);
return true;
}
gfxSharedImageSurface::~gfxSharedImageSurface()
{
}
gfxSharedImageSurface::gfxSharedImageSurface()
{
}
gfxSharedImageSurface::gfxSharedImageSurface(const mozilla::ipc::Shmem &aShmem)
{
mShmem = aShmem;
SharedImageInfo *shmInfo = GetShmInfoPtr(aShmem);
mSize.width = shmInfo->width;
mSize.height = shmInfo->height;
mFormat = (gfxImageFormat)shmInfo->format;
mStride = ComputeStride();
if (!InitSurface(PR_FALSE))
NS_RUNTIMEABORT("Shared memory is bad");
}
PRBool
gfxSharedImageSurface::IsSharedImage(gfxASurface *aSurface)
{
return (aSurface
&& aSurface->GetType() == gfxASurface::SurfaceTypeImage
&& aSurface->GetData(&SHM_KEY));
}