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128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
// vim:set ts=4 sts=4 sw=4 et cin:
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Nokia Corporation code.
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*
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* The Initial Developer of the Original Code is Nokia Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Oleg Romashin <romaxa@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "base/basictypes.h"
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#include "gfxSharedImageSurface.h"
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#include "cairo.h"
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#define MOZ_ALIGN_WORD(x) (((x) + 3) & ~3)
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using namespace mozilla::ipc;
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static const cairo_user_data_key_t SHM_KEY = {0};
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struct SharedImageInfo {
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PRInt32 width;
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PRInt32 height;
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PRInt32 format;
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};
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static SharedImageInfo*
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GetShmInfoPtr(const Shmem& aShmem)
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{
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return reinterpret_cast<SharedImageInfo*>
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(aShmem.get<char>() + aShmem.Size<char>() - sizeof(SharedImageInfo));
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}
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gfxSharedImageSurface::~gfxSharedImageSurface()
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{
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MOZ_COUNT_DTOR(gfxSharedImageSurface);
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}
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/*static*/ PRBool
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gfxSharedImageSurface::IsSharedImage(gfxASurface* aSurface)
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{
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return (aSurface
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&& aSurface->GetType() == gfxASurface::SurfaceTypeImage
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&& aSurface->GetData(&SHM_KEY));
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}
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gfxSharedImageSurface::gfxSharedImageSurface(const gfxIntSize& aSize,
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gfxImageFormat aFormat,
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const Shmem& aShmem)
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{
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MOZ_COUNT_CTOR(gfxSharedImageSurface);
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mSize = aSize;
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mFormat = aFormat;
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mStride = ComputeStride(aSize, aFormat);
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mShmem = aShmem;
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mData = aShmem.get<unsigned char>();
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cairo_surface_t *surface =
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cairo_image_surface_create_for_data(mData,
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(cairo_format_t)mFormat,
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mSize.width,
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mSize.height,
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mStride);
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if (surface) {
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cairo_surface_set_user_data(surface, &SHM_KEY, this, NULL);
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}
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Init(surface);
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}
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void
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gfxSharedImageSurface::WriteShmemInfo()
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{
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SharedImageInfo* shmInfo = GetShmInfoPtr(mShmem);
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shmInfo->width = mSize.width;
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shmInfo->height = mSize.height;
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shmInfo->format = mFormat;
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}
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/*static*/ size_t
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gfxSharedImageSurface::GetAlignedSize(const gfxIntSize& aSize, long aStride)
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{
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return MOZ_ALIGN_WORD(sizeof(SharedImageInfo) + aSize.height * aStride);
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}
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/*static*/ already_AddRefed<gfxSharedImageSurface>
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gfxSharedImageSurface::Open(const Shmem& aShmem)
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{
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SharedImageInfo* shmInfo = GetShmInfoPtr(aShmem);
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gfxIntSize size(shmInfo->width, shmInfo->height);
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if (!CheckSurfaceSize(size))
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return nsnull;
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nsRefPtr<gfxSharedImageSurface> s =
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new gfxSharedImageSurface(size,
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(gfxImageFormat)shmInfo->format,
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aShmem);
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// We didn't create this Shmem and so don't free it on errors
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return (s->CairoStatus() != 0) ? nsnull : s.forget();
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}
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