source: trunk/src/openvg/qwindowsurface_vgegl.cpp@ 858

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtOpenVG module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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** GNU Lesser General Public License Usage
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** 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
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** 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
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#include "qwindowsurface_vgegl_p.h"
#include "qpaintengine_vg_p.h"
#include "qpixmapdata_vg_p.h"
#include "qvgimagepool_p.h"
#include "qvg_p.h"

#if !defined(QT_NO_EGL)

QT_BEGIN_NAMESPACE

// Turn off "direct to window" rendering if EGL cannot support it.
#if !defined(EGL_RENDER_BUFFER) || !defined(EGL_SINGLE_BUFFER)
#if defined(QVG_DIRECT_TO_WINDOW)
#undef QVG_DIRECT_TO_WINDOW
#endif
#endif

// Determine if preserved window contents should be used.
#if !defined(EGL_SWAP_BEHAVIOR) || !defined(EGL_BUFFER_PRESERVED)
#if !defined(QVG_NO_PRESERVED_SWAP)
#define QVG_NO_PRESERVED_SWAP 1
#endif
#endif

VGImageFormat qt_vg_config_to_vg_format(QEglContext *context)
{
    return qt_vg_image_to_vg_format
        (qt_vg_config_to_image_format(context));
}

QImage::Format qt_vg_config_to_image_format(QEglContext *context)
{
    EGLint red = context->configAttrib(EGL_RED_SIZE);
    EGLint green = context->configAttrib(EGL_GREEN_SIZE);
    EGLint blue = context->configAttrib(EGL_BLUE_SIZE);
    EGLint alpha = context->configAttrib(EGL_ALPHA_SIZE);
    QImage::Format argbFormat;
#ifdef EGL_VG_ALPHA_FORMAT_PRE_BIT
    EGLint type = context->configAttrib(EGL_SURFACE_TYPE);
    if ((type & EGL_VG_ALPHA_FORMAT_PRE_BIT) != 0)
        argbFormat = QImage::Format_ARGB32_Premultiplied;
    else
        argbFormat = QImage::Format_ARGB32;
#else
    argbFormat = QImage::Format_ARGB32;
#endif
    if (red == 8 && green == 8 && blue == 8 && alpha == 8)
        return argbFormat;
    else if (red == 8 && green == 8 && blue == 8 && alpha == 0)
        return QImage::Format_RGB32;
    else if (red == 5 && green == 6 && blue == 5 && alpha == 0)
        return QImage::Format_RGB16;
    else if (red == 4 && green == 4 && blue == 4 && alpha == 4)
        return QImage::Format_ARGB4444_Premultiplied;
    else
        return argbFormat;       // XXX
}

#if !defined(QVG_NO_SINGLE_CONTEXT)

class QVGSharedContext
{
public:
    QVGSharedContext();
    ~QVGSharedContext();

    QEglContext *context;
    int refCount;
    int widgetRefCount;
    QVGPaintEngine *engine;
    EGLSurface surface;
    QVGPixmapData *firstPixmap;
};

QVGSharedContext::QVGSharedContext()
    : context(0)
    , refCount(0)
    , widgetRefCount(0)
    , engine(0)
    , surface(EGL_NO_SURFACE)
    , firstPixmap(0)
{
}

QVGSharedContext::~QVGSharedContext()
{
    // Don't accidentally destroy the QEglContext if the reference
    // count falls to zero while deleting the paint engine.
    ++refCount;

    if (context)
        context->makeCurrent(qt_vg_shared_surface());
    delete engine;
    if (context)
        context->doneCurrent();
    if (context && surface != EGL_NO_SURFACE)
        context->destroySurface(surface);
    delete context;
}

Q_GLOBAL_STATIC(QVGSharedContext, sharedContext);

QVGPaintEngine *qt_vg_create_paint_engine(void)
{
    QVGSharedContext *shared = sharedContext();
    if (!shared->engine)
        shared->engine = new QVGPaintEngine();
    return shared->engine;
}

void qt_vg_destroy_paint_engine(QVGPaintEngine *engine)
{
    Q_UNUSED(engine);
}

void qt_vg_register_pixmap(QVGPixmapData *pd)
{
    QVGSharedContext *shared = sharedContext();
    pd->next = shared->firstPixmap;
    pd->prev = 0;
    if (shared->firstPixmap)
        shared->firstPixmap->prev = pd;
    shared->firstPixmap = pd;
}

void qt_vg_unregister_pixmap(QVGPixmapData *pd)
{
    if (pd->next)
        pd->next->prev = pd->prev;
    if (pd->prev) {
        pd->prev->next = pd->next;
    } else {
        QVGSharedContext *shared = sharedContext();
        if (shared)
           shared->firstPixmap = pd->next;
    }
}