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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qopengltexturecache_p.h"
#include <private/qopenglcontext_p.h>
#include <private/qimagepixmapcleanuphooks_p.h>
#include <qplatformpixmap_qpa.h>
QT_BEGIN_NAMESPACE
class QOpenGLTextureCacheWrapper
{
public:
QOpenGLTextureCacheWrapper()
{
QImagePixmapCleanupHooks::instance()->addPlatformPixmapModificationHook(cleanupTexturesForPixmapData);
QImagePixmapCleanupHooks::instance()->addPlatformPixmapDestructionHook(cleanupTexturesForPixmapData);
QImagePixmapCleanupHooks::instance()->addImageHook(cleanupTexturesForCacheKey);
}
~QOpenGLTextureCacheWrapper()
{
QImagePixmapCleanupHooks::instance()->removePlatformPixmapModificationHook(cleanupTexturesForPixmapData);
QImagePixmapCleanupHooks::instance()->removePlatformPixmapDestructionHook(cleanupTexturesForPixmapData);
QImagePixmapCleanupHooks::instance()->removeImageHook(cleanupTexturesForCacheKey);
}
QOpenGLTextureCache *cacheForContext(QOpenGLContext *context) {
QMutexLocker lock(&m_mutex);
return m_resource.value<QOpenGLTextureCache>(context);
}
static void cleanupTexturesForCacheKey(qint64 key);
static void cleanupTexturesForPixmapData(QPlatformPixmap *pmd);
private:
QOpenGLMultiGroupSharedResource m_resource;
QMutex m_mutex;
};
Q_GLOBAL_STATIC(QOpenGLTextureCacheWrapper, qt_texture_caches)
QOpenGLTextureCache *QOpenGLTextureCache::cacheForContext(QOpenGLContext *context)
{
return qt_texture_caches()->cacheForContext(context);
}
void QOpenGLTextureCacheWrapper::cleanupTexturesForCacheKey(qint64 key)
{
QList<QOpenGLSharedResource *> resources = qt_texture_caches()->m_resource.resources();
for (QList<QOpenGLSharedResource *>::iterator it = resources.begin(); it != resources.end(); ++it)
static_cast<QOpenGLTextureCache *>(*it)->invalidate(key);
}
void QOpenGLTextureCacheWrapper::cleanupTexturesForPixmapData(QPlatformPixmap *pmd)
{
cleanupTexturesForCacheKey(pmd->cacheKey());
}
QOpenGLTextureCache::QOpenGLTextureCache(QOpenGLContext *ctx)
: QOpenGLSharedResource(ctx->shareGroup())
, m_cache(64 * 1024) // 64 MB cache
{
}
QOpenGLTextureCache::~QOpenGLTextureCache()
{
}
GLuint QOpenGLTextureCache::bindTexture(QOpenGLContext *context, const QPixmap &pixmap)
{
if (pixmap.isNull())
return 0;
QMutexLocker locker(&m_mutex);
qint64 key = pixmap.cacheKey();
// A QPainter is active on the image - take the safe route and replace the texture.
if (!pixmap.paintingActive()) {
QOpenGLCachedTexture *entry = m_cache.object(key);
if (entry) {
glBindTexture(GL_TEXTURE_2D, entry->id());
return entry->id();
}
}
GLuint id = bindTexture(context, key, pixmap.toImage());
if (id > 0)
QImagePixmapCleanupHooks::enableCleanupHooks(pixmap);
return id;
}
GLuint QOpenGLTextureCache::bindTexture(QOpenGLContext *context, const QImage &image)
{
if (image.isNull())
return 0;
QMutexLocker locker(&m_mutex);
qint64 key = image.cacheKey();
// A QPainter is active on the image - take the safe route and replace the texture.
if (!image.paintingActive()) {
QOpenGLCachedTexture *entry = m_cache.object(key);
if (entry) {
glBindTexture(GL_TEXTURE_2D, entry->id());
return entry->id();
}
}
GLuint id = bindTexture(context, key, image);
if (id > 0)
QImagePixmapCleanupHooks::enableCleanupHooks(image);
return id;
}
static inline void qgl_byteSwapImage(QImage &img)
{
const int width = img.width();
const int height = img.height();
if (QSysInfo::ByteOrder == QSysInfo::LittleEndian)
{
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);
}
} else {
for (int i = 0; i < height; ++i) {
uint *p = (uint *) img.scanLine(i);
for (int x = 0; x < width; ++x)
p[x] = (p[x] << 8) | (p[x] >> 24);
}
}
}
GLuint QOpenGLTextureCache::bindTexture(QOpenGLContext *context, qint64 key, const QImage &image)
{
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
QImage tx = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
qgl_byteSwapImage(tx);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tx.width(), tx.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, const_cast<const QImage &>(tx).bits());
int cost = tx.width() * tx.height() * 4 / 1024;
m_cache.insert(key, new QOpenGLCachedTexture(id, context), cost);
return id;
}
void QOpenGLTextureCache::invalidate(qint64 key)
{
QMutexLocker locker(&m_mutex);
m_cache.remove(key);
}
void QOpenGLTextureCache::invalidateResource()
{
m_cache.clear();
}
void QOpenGLTextureCache::freeResource(QOpenGLContext *)
{
Q_ASSERT(false); // the texture cache lives until the context group disappears
}
static void freeTexture(QOpenGLFunctions *, GLuint id)
{
glDeleteTextures(1, &id);
}
QOpenGLCachedTexture::QOpenGLCachedTexture(GLuint id, QOpenGLContext *context)
{
m_resource = new QOpenGLSharedResourceGuard(context, id, freeTexture);
}
QT_END_NAMESPACE
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