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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt scene graph research project.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgtexturemanager.h"
#include <QImage>
#include <qgl.h>
#include <qhash.h>
QSGTexture::QSGTexture()
: m_status(Null)
, m_texture_id(0)
, m_ref_count(0)
, m_has_alpha(false)
, m_owns_texture(true)
, m_has_mipmaps(false)
{
}
QSGTexture::~QSGTexture()
{
if (m_owns_texture)
glDeleteTextures(1, (GLuint *) &m_texture_id);
}
void QSGTexture::setStatus(Status s)
{
m_status = s;
Q_ASSERT(s != Ready || (m_texture_id > 0 && !m_texture_size.isEmpty()));
emit statusChanged(s);
}
struct QSGTextureCacheKey {
quint64 cacheKey;
bool operator==(const QSGTextureCacheKey &other) const {
return other.cacheKey == cacheKey;
}
};
uint qHash(const QSGTextureCacheKey &key)
{
return (key.cacheKey >> 32) ^ uint(key.cacheKey);
}
class QSGTextureManagerPrivate
{
public:
QHash<QSGTextureCacheKey, QSGTexture *> cache;
};
QSGTextureManager::QSGTextureManager()
: d(new QSGTextureManagerPrivate)
{
}
QImage QSGTextureManager::swizzleBGGRAToRGBA(const QImage &image)
{
QImage img = image.copy();
const int width = img.width();
const int height = img.height();
for (int i = 0; i < height; ++i) {
uint *p = (uint *) img.scanLine(i);
for (int x = 0; x < width; ++x)
p[x] = ((p[x] << 16) & 0xff0000) | ((p[x] >> 16) & 0xff) | (p[x] & 0xff00ff00);
}
return img;
}
QSGTextureRef QSGTextureManager::upload(const QImage &image)
{
QSGTextureCacheKey key = { image.cacheKey() };
QSGTexture *texture = d->cache.value(key);
if (texture)
return QSGTextureRef(texture);
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
#ifdef QT_OPENGL_ES
QImage i = swizzleBGRAToRGBA(image);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, i.width(), i.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, i.constBits());
#else
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.width(), image.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, image.constBits());
#endif
texture = new QSGTexture;
texture->setTextureId(id);
texture->setTextureSize(image.size());
texture->setAlphaChannel(image.hasAlphaChannel());
texture->setStatus(QSGTexture::Ready);
d->cache.insert(key, texture);
QSGTextureRef ref(texture);
return ref;
}
QSGTextureRef QSGTextureManager::requestUpload(const QImage &image,
const QObject *listener,
const char *slot)
{
QSGTextureRef texture = upload(image);
return texture;
}
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