source: branches/4.5.1/src/opengl/qpixmapdata_gl.cpp@ 1168

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**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
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#include "qpixmap.h"

#include <private/qpaintengine_raster_p.h>

#include "qpixmapdata_gl_p.h"

#include <private/qgl_p.h>
#include <private/qdrawhelper_p.h>

QT_BEGIN_NAMESPACE

extern QGLWidget* qt_gl_share_widget();

class QGLShareContextScope
{
public:
    QGLShareContextScope(const QGLContext *ctx)
        : m_oldContext(0)
        , m_ctx(const_cast<QGLContext *>(ctx))
    {
        const QGLContext *currentContext = QGLContext::currentContext();
        if (currentContext != ctx && !qgl_share_reg()->checkSharing(ctx, currentContext)) {
            m_oldContext = const_cast<QGLContext *>(currentContext);
            m_ctx->makeCurrent();
        }
    }

    operator QGLContext *()
    {
        return m_ctx;
    }

    QGLContext *operator->()
    {
        return m_ctx;
    }

    ~QGLShareContextScope()
    {
        if (m_oldContext)
            m_oldContext->makeCurrent();
    }

private:
    QGLContext *m_oldContext;
    QGLContext *m_ctx;
};

void qt_gl_convertFromGLImage(QImage *img)
{
    const int w = img->width();
    const int h = img->height();

    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
        uint *p = (uint*)img->bits();
        uint *end = p + w*h;

        while (p < end) {
            uint a = *p << 24;
            *p = (*p >> 8) | a;
            p++;
        }

        *img = img->mirrored();
    } else {
        // mirror image
        uint *data = (uint *)img->bits();

        const int mid = h/2;

        for (int y = 0; y < mid; ++y) {
            uint *p = data + y * w;
            uint *end = p + w;
            uint *q = data + (h - y - 1) * w;

            while (p < end)
                qSwap(*p++, *q++);
        }
    }
}


static int qt_gl_pixmap_serial = 0;

QGLPixmapData::QGLPixmapData(PixelType type)
    : QPixmapData(type, OpenGLClass)
    , m_width(0)