gecko/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
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "base/basictypes.h"
#include "gfxSharedImageSurface.h"
#include "cairo.h"
#define MOZ_ALIGN_WORD(x) (((x) + 3) & ~3)
using namespace mozilla::ipc;
static const cairo_user_data_key_t SHM_KEY = {0};
struct SharedImageInfo {
PRInt32 width;
PRInt32 height;
PRInt32 format;
};
static SharedImageInfo*
GetShmInfoPtr(const Shmem& aShmem)
{
return reinterpret_cast<SharedImageInfo*>
(aShmem.get<char>() + aShmem.Size<char>() - sizeof(SharedImageInfo));
}
gfxSharedImageSurface::~gfxSharedImageSurface()
{
MOZ_COUNT_DTOR(gfxSharedImageSurface);
}
/*static*/ PRBool
gfxSharedImageSurface::IsSharedImage(gfxASurface* aSurface)
{
return (aSurface
&& aSurface->GetType() == gfxASurface::SurfaceTypeImage
&& aSurface->GetData(&SHM_KEY));
}
gfxSharedImageSurface::gfxSharedImageSurface(const gfxIntSize& aSize,
gfxImageFormat aFormat,
const Shmem& aShmem)
{
MOZ_COUNT_CTOR(gfxSharedImageSurface);
mSize = aSize;
mFormat = aFormat;
mStride = ComputeStride(aSize, aFormat);
mShmem = aShmem;
mData = aShmem.get<unsigned char>();
cairo_surface_t *surface =
cairo_image_surface_create_for_data(mData,
(cairo_format_t)mFormat,
mSize.width,
mSize.height,
mStride);
if (surface) {
cairo_surface_set_user_data(surface, &SHM_KEY, this, NULL);
}
Init(surface);
}
void
gfxSharedImageSurface::WriteShmemInfo()
{
SharedImageInfo* shmInfo = GetShmInfoPtr(mShmem);
shmInfo->width = mSize.width;
shmInfo->height = mSize.height;
shmInfo->format = mFormat;
}
/*static*/ size_t
gfxSharedImageSurface::GetAlignedSize(const gfxIntSize& aSize, long aStride)
{
return MOZ_ALIGN_WORD(sizeof(SharedImageInfo) + aSize.height * aStride);
}
/*static*/ already_AddRefed<gfxSharedImageSurface>
gfxSharedImageSurface::Open(const Shmem& aShmem)
{
SharedImageInfo* shmInfo = GetShmInfoPtr(aShmem);
gfxIntSize size(shmInfo->width, shmInfo->height);
if (!CheckSurfaceSize(size))
return nsnull;
nsRefPtr<gfxSharedImageSurface> s =
new gfxSharedImageSurface(size,
(gfxImageFormat)shmInfo->format,
aShmem);
// We didn't create this Shmem and so don't free it on errors
return (s->CairoStatus() != 0) ? nsnull : s.forget();
}