gecko/widget/android/AndroidDirectTexture.cpp
James Willcox 7df90dda44 Bug 716190 - Retry graphic buffer locks if we get -EBUSY r=pcwalton
--HG--
extra : rebase_source : 969aee231df4ac7ac70086fa2fa836c26a090b8e
2012-01-17 15:00:56 -05:00

160 lines
4.5 KiB
C++

/* -*- Mode: C++; tab-width: 20; 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 Corporation 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):
* James Willcox <jwillcox@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 <unistd.h>
#include <errno.h>
#include "AndroidDirectTexture.h"
typedef gfxASurface::gfxImageFormat gfxImageFormat;
namespace mozilla {
AndroidDirectTexture::AndroidDirectTexture(PRUint32 width, PRUint32 height, PRUint32 usage,
gfxImageFormat format) :
mLock("AndroidDirectTexture.mLock")
, mNeedFlip(false)
, mWidth(width)
, mHeight(height)
, mFormat(format)
, mPendingReallocBuffer(NULL)
{
mFrontBuffer = new AndroidGraphicBuffer(width, height, usage, format);
mBackBuffer = new AndroidGraphicBuffer(width, height, usage, format);
}
AndroidDirectTexture::~AndroidDirectTexture()
{
if (mFrontBuffer) {
delete mFrontBuffer;
mFrontBuffer = NULL;
}
if (mBackBuffer) {
delete mBackBuffer;
mBackBuffer = NULL;
}
}
void
AndroidDirectTexture::ReallocPendingBuffer()
{
// We may have reallocated while the current back buffer was being
// used as the front buffer. If we have such a reallocation pending
// and the current back buffer is the target buffer, do it now.
//
// It is assumed that mLock is already acquired
if (mPendingReallocBuffer == mBackBuffer) {
mBackBuffer->Reallocate(mWidth, mHeight, mFormat);
mPendingReallocBuffer = NULL;
}
}
bool
AndroidDirectTexture::Lock(PRUint32 aUsage, unsigned char **bits)
{
nsIntRect rect(0, 0, mWidth, mHeight);
return Lock(aUsage, rect, bits);
}
bool
AndroidDirectTexture::Lock(PRUint32 aUsage, const nsIntRect& aRect, unsigned char **bits)
{
mLock.Lock();
ReallocPendingBuffer();
int result;
while ((result = mBackBuffer->Lock(aUsage, aRect, bits)) == -EBUSY) {
usleep(1000); // 1ms
}
return result == 0;
}
bool
AndroidDirectTexture::Unlock(bool aFlip)
{
if (aFlip) {
mNeedFlip = true;
}
bool result = mBackBuffer->Unlock();
mLock.Unlock();
return result;
}
bool
AndroidDirectTexture::Reallocate(PRUint32 aWidth, PRUint32 aHeight) {
return Reallocate(aWidth, aHeight, mFormat);
}
bool
AndroidDirectTexture::Reallocate(PRUint32 aWidth, PRUint32 aHeight, gfxASurface::gfxImageFormat aFormat)
{
MutexAutoLock lock(mLock);
// We only reallocate the current back buffer. The front buffer is likely
// in use, so we'll reallocate it on the first Lock() after it is rotated
// to the back.
bool result = mBackBuffer->Reallocate(aWidth, aHeight, aFormat);
if (result) {
mPendingReallocBuffer = mFrontBuffer;
mWidth = aWidth;
mHeight = aHeight;
}
return result;
}
bool
AndroidDirectTexture::Bind()
{
MutexAutoLock lock(mLock);
if (mNeedFlip) {
AndroidGraphicBuffer* tmp = mBackBuffer;
mBackBuffer = mFrontBuffer;
mFrontBuffer = tmp;
mNeedFlip = false;
}
return mFrontBuffer->Bind();
}
} /* mozilla */