forked from mirror/libbpg
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
/*****************************************************************************
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* Copyright (C) 2013 x265 project
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*
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* Authors: Steve Borho <steve@borho.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at license @ x265.com
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*****************************************************************************/
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#include "threadpool.h"
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#include "threading.h"
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#include "wavefront.h"
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#include "common.h"
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namespace X265_NS {
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// x265 private namespace
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bool WaveFront::init(int numRows)
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{
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m_numRows = numRows;
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m_numWords = (numRows + 31) >> 5;
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m_internalDependencyBitmap = X265_MALLOC(uint32_t, m_numWords);
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if (m_internalDependencyBitmap)
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memset((void*)m_internalDependencyBitmap, 0, sizeof(uint32_t) * m_numWords);
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m_externalDependencyBitmap = X265_MALLOC(uint32_t, m_numWords);
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if (m_externalDependencyBitmap)
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memset((void*)m_externalDependencyBitmap, 0, sizeof(uint32_t) * m_numWords);
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return m_internalDependencyBitmap && m_externalDependencyBitmap;
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}
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WaveFront::~WaveFront()
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{
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x265_free((void*)m_internalDependencyBitmap);
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x265_free((void*)m_externalDependencyBitmap);
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}
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void WaveFront::clearEnabledRowMask()
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{
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memset((void*)m_externalDependencyBitmap, 0, sizeof(uint32_t) * m_numWords);
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memset((void*)m_internalDependencyBitmap, 0, sizeof(uint32_t) * m_numWords);
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}
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void WaveFront::enqueueRow(int row)
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{
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uint32_t bit = 1 << (row & 31);
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ATOMIC_OR(&m_internalDependencyBitmap[row >> 5], bit);
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}
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void WaveFront::enableRow(int row)
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{
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uint32_t bit = 1 << (row & 31);
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ATOMIC_OR(&m_externalDependencyBitmap[row >> 5], bit);
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}
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void WaveFront::enableAllRows()
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{
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memset((void*)m_externalDependencyBitmap, ~0, sizeof(uint32_t) * m_numWords);
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}
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bool WaveFront::dequeueRow(int row)
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{
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uint32_t bit = 1 << (row & 31);
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return !!(ATOMIC_AND(&m_internalDependencyBitmap[row >> 5], ~bit) & bit);
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}
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void WaveFront::findJob(int threadId)
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{
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unsigned long id;
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/* Loop over each word until all available rows are finished */
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for (int w = 0; w < m_numWords; w++)
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{
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uint32_t oldval = m_internalDependencyBitmap[w] & m_externalDependencyBitmap[w];
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while (oldval)
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{
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CTZ(id, oldval);
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uint32_t bit = 1 << id;
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if (ATOMIC_AND(&m_internalDependencyBitmap[w], ~bit) & bit)
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{
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/* we cleared the bit, we get to process the row */
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processRow(w * 32 + id, threadId);
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m_helpWanted = true;
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return; /* check for a higher priority task */
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}
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oldval = m_internalDependencyBitmap[w] & m_externalDependencyBitmap[w];
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}
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}
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m_helpWanted = false;
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}
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}
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