gecko-dev/gfx/ipc/SharedDIBWin.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jim Mathies <jmathies@mozilla.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 "SharedDIBWin.h"
#include "gfxAlphaRecovery.h"
#include "nsMathUtils.h"
#include "nsDebug.h"
namespace mozilla {
namespace gfx {
static const PRUint32 kBytesPerPixel = 4;
static const PRUint32 kByteAlign = 1 << gfxAlphaRecovery::GoodAlignmentLog2();
static const PRUint32 kHeaderBytes =
(sizeof(BITMAPV4HEADER) + kByteAlign - 1) & ~(kByteAlign - 1);
SharedDIBWin::SharedDIBWin() :
mSharedHdc(nsnull)
, mSharedBmp(nsnull)
, mOldObj(nsnull)
{
}
SharedDIBWin::~SharedDIBWin()
{
Close();
}
nsresult
SharedDIBWin::Close()
{
if (mSharedHdc && mOldObj)
::SelectObject(mSharedHdc, mOldObj);
if (mSharedHdc)
::DeleteObject(mSharedHdc);
if (mSharedBmp)
::DeleteObject(mSharedBmp);
mSharedHdc = NULL;
mOldObj = mSharedBmp = NULL;
SharedDIB::Close();
return NS_OK;
}
nsresult
SharedDIBWin::Create(HDC aHdc, PRUint32 aWidth, PRUint32 aHeight,
bool aTransparent)
{
Close();
// create the offscreen shared dib
BITMAPV4HEADER bmih;
PRUint32 size = SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih);
nsresult rv = SharedDIB::Create(size);
if (NS_FAILED(rv))
return rv;
if (NS_FAILED(SetupSurface(aHdc, &bmih))) {
Close();
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
SharedDIBWin::Attach(Handle aHandle, PRUint32 aWidth, PRUint32 aHeight,
bool aTransparent)
{
Close();
BITMAPV4HEADER bmih;
SetupBitmapHeader(aWidth, aHeight, aTransparent, &bmih);
nsresult rv = SharedDIB::Attach(aHandle, 0);
if (NS_FAILED(rv))
return rv;
if (NS_FAILED(SetupSurface(NULL, &bmih))) {
Close();
return NS_ERROR_FAILURE;
}
return NS_OK;
}
PRUint32
SharedDIBWin::SetupBitmapHeader(PRUint32 aWidth, PRUint32 aHeight,
bool aTransparent, BITMAPV4HEADER *aHeader)
{
// D3D cannot handle an offscreen memory that pitch (SysMemPitch) is negative.
// So we create top-to-bottom DIB.
memset((void*)aHeader, 0, sizeof(BITMAPV4HEADER));
aHeader->bV4Size = sizeof(BITMAPV4HEADER);
aHeader->bV4Width = aWidth;
aHeader->bV4Height = -LONG(aHeight); // top-to-buttom DIB
aHeader->bV4Planes = 1;
aHeader->bV4BitCount = 32;
aHeader->bV4V4Compression = BI_BITFIELDS;
aHeader->bV4RedMask = 0x00FF0000;
aHeader->bV4GreenMask = 0x0000FF00;
aHeader->bV4BlueMask = 0x000000FF;
if (aTransparent)
aHeader->bV4AlphaMask = 0xFF000000;
return (kHeaderBytes + (-aHeader->bV4Height * aHeader->bV4Width * kBytesPerPixel));
}
nsresult
SharedDIBWin::SetupSurface(HDC aHdc, BITMAPV4HEADER *aHdr)
{
mSharedHdc = ::CreateCompatibleDC(aHdc);
if (!mSharedHdc)
return NS_ERROR_FAILURE;
mSharedBmp = ::CreateDIBSection(mSharedHdc,
(BITMAPINFO*)aHdr,
DIB_RGB_COLORS,
&mBitmapBits,
mShMem->handle(),
kHeaderBytes);
if (!mSharedBmp)
return NS_ERROR_FAILURE;
mOldObj = SelectObject(mSharedHdc, mSharedBmp);
return NS_OK;
}
} // gfx
} // mozilla