qglpixelbuffer.cpp

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#include <QtCore/qglobal.h>

#if !defined(QT_OPENGL_ES_1)
#include <private/qpaintengineex_opengl2_p.h>
#endif

#include <qglpixelbuffer.h>
#include <private/qglpixelbuffer_p.h>
#include <private/qfont_p.h>
#include <qimage.h>

#ifndef QT_OPENGL_ES_2
#include <private/qpaintengine_opengl_p.h>
#endif

QT_BEGIN_NAMESPACE

#if !defined(QT_OPENGL_ES_2)
extern void qgl_cleanup_glyph_cache(QGLContext *);
#else
void qgl_cleanup_glyph_cache(QGLContext *) {}
#endif

extern QImage qt_gl_read_framebuffer(const QSize&, bool, bool);


QGLContext* QGLPBufferGLPaintDevice::context() const
{
    return pbuf->d_func()->qctx;
}

void QGLPBufferGLPaintDevice::endPaint() {
    glFlush();
    QGLPaintDevice::endPaint();
}

void QGLPBufferGLPaintDevice::setPBuffer(QGLPixelBuffer* pb)
{
    pbuf = pb;
}

void QGLPixelBufferPrivate::common_init(const QSize &size, const QGLFormat &format, QGLWidget *shareWidget)
{
    Q_Q(QGLPixelBuffer);
    if(init(size, format, shareWidget)) {
        req_size = size;
        req_format = format;
        req_shareWidget = shareWidget;
        invalid = false;
        qctx = new QGLContext(format);
        qctx->d_func()->sharing = (shareWidget != 0);
        if (shareWidget != 0 && shareWidget->d_func()->glcx) {
            QGLContextGroup::addShare(qctx, shareWidget->d_func()->glcx);
            shareWidget->d_func()->glcx->d_func()->sharing = true;
        }

        glDevice.setPBuffer(q);
        qctx->d_func()->paintDevice = q;
        qctx->d_func()->valid = true;
#if defined(Q_WS_WIN) && !defined(QT_OPENGL_ES)
        qctx->d_func()->dc = dc;
        qctx->d_func()->rc = ctx;
#elif (defined(Q_WS_X11) && defined(QT_NO_EGL))
        qctx->d_func()->cx = ctx;
        qctx->d_func()->pbuf = (void *) pbuf;
        qctx->d_func()->vi = 0;
#elif defined(Q_WS_MAC)
        qctx->d_func()->cx = ctx;
        qctx->d_func()->vi = 0;
#elif !defined(QT_NO_EGL)
        qctx->d_func()->eglContext = ctx;
        qctx->d_func()->eglSurface = pbuf;
#endif
    }
}

QGLPixelBuffer::QGLPixelBuffer(const QSize &size, const QGLFormat &format, QGLWidget *shareWidget)
    : d_ptr(new QGLPixelBufferPrivate(this))
{
    Q_D(QGLPixelBuffer);
    d->common_init(size, format, shareWidget);
}


QGLPixelBuffer::QGLPixelBuffer(int width, int height, const QGLFormat &format, QGLWidget *shareWidget)
    : d_ptr(new QGLPixelBufferPrivate(this))
{
    Q_D(QGLPixelBuffer);
    d->common_init(QSize(width, height), format, shareWidget);
}


QGLPixelBuffer::~QGLPixelBuffer()
{
    Q_D(QGLPixelBuffer);

    // defined in qpaintengine_opengl.cpp
    QGLContext *current = const_cast<QGLContext *>(QGLContext::currentContext());
    if (current != d->qctx)
        makeCurrent();
    qgl_cleanup_glyph_cache(d->qctx);
    d->cleanup();
    delete d->qctx;
    if (current && current != d->qctx)
        current->makeCurrent();
}

bool QGLPixelBuffer::makeCurrent()
{
    Q_D(QGLPixelBuffer);
    if (d->invalid)
        return false;
    d->qctx->makeCurrent();
    return true;
}

bool QGLPixelBuffer::doneCurrent()
{
    Q_D(QGLPixelBuffer);
    if (d->invalid)
        return false;
    d->qctx->doneCurrent();
    return true;
}

#if (defined(Q_WS_X11) || defined(Q_WS_WIN)) && defined(QT_NO_EGL)
GLuint QGLPixelBuffer::generateDynamicTexture() const
{
    Q_D(const QGLPixelBuffer);
    GLuint texture;
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, d->req_size.width(), d->req_size.height(), 0, GL_RGBA, GL_FLOAT, 0);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    return texture;
}
#endif

void QGLPixelBuffer::updateDynamicTexture(GLuint texture_id) const
{
    Q_D(const QGLPixelBuffer);
    if (d->invalid)
        return;
    glBindTexture(GL_TEXTURE_2D, texture_id);
#ifndef QT_OPENGL_ES
    glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 0, 0, d->req_size.width(), d->req_size.height(), 0);
#else
    glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, d->req_size.width(), d->req_size.height(), 0);
#endif
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
void QGLPixelBuffer::updateDynamicTexture(QMacCompatGLuint texture_id) const
{
    updateDynamicTexture(GLuint(texture_id));
}
#endif

QSize QGLPixelBuffer::size() const
{
    Q_D(const QGLPixelBuffer);
    return d->req_size;
}

QImage QGLPixelBuffer::toImage() const
{
    Q_D(const QGLPixelBuffer);
    if (d->invalid)
        return QImage();

    const_cast<QGLPixelBuffer *>(this)->makeCurrent();
    return qt_gl_read_framebuffer(d->req_size, d->format.alpha(), true);
}

Qt::HANDLE QGLPixelBuffer::handle() const
{
    Q_D(const QGLPixelBuffer);
    if (d->invalid)
        return 0;
    return (Qt::HANDLE) d->pbuf;
}

bool QGLPixelBuffer::isValid() const
{
    Q_D(const QGLPixelBuffer);
    return !d->invalid;
}

#if !defined(QT_OPENGL_ES_1)
Q_GLOBAL_STATIC(QGLEngineThreadStorage<QGL2PaintEngineEx>, qt_buffer_2_engine)
#endif

#ifndef QT_OPENGL_ES_2
Q_GLOBAL_STATIC(QGLEngineThreadStorage<QOpenGLPaintEngine>, qt_buffer_engine)
#endif

QPaintEngine *QGLPixelBuffer::paintEngine() const
{
#if defined(QT_OPENGL_ES_1)
    return qt_buffer_engine()->engine();
#elif defined(QT_OPENGL_ES_2)
    return qt_buffer_2_engine()->engine();
#else
    if (qt_gl_preferGL2Engine())
        return qt_buffer_2_engine()->engine();
    else
        return qt_buffer_engine()->engine();
#endif
}

int QGLPixelBuffer::metric(PaintDeviceMetric metric) const
{
    Q_D(const QGLPixelBuffer);

    float dpmx = qt_defaultDpiX()*100./2.54;
    float dpmy = qt_defaultDpiY()*100./2.54;
    int w = d->req_size.width();
    int h = d->req_size.height();
    switch (metric) {
    case PdmWidth:
        return w;

    case PdmHeight:
        return h;

    case PdmWidthMM:
        return qRound(w * 1000 / dpmx);

    case PdmHeightMM:
        return qRound(h * 1000 / dpmy);

    case PdmNumColors:
        return 0;

    case PdmDepth:
        return 32;//d->depth;

    case PdmDpiX:
        return qRound(dpmx * 0.0254);

    case PdmDpiY:
        return qRound(dpmy * 0.0254);

    case PdmPhysicalDpiX:
        return qRound(dpmx * 0.0254);

    case PdmPhysicalDpiY:
        return qRound(dpmy * 0.0254);

    default:
        qWarning("QGLPixelBuffer::metric(), Unhandled metric type: %d\n", metric);
        break;
    }
    return 0;
}

GLuint QGLPixelBuffer::bindTexture(const QImage &image, GLenum target)
{
    Q_D(QGLPixelBuffer);
#ifndef QT_OPENGL_ES
    return d->qctx->bindTexture(image, target, GLint(GL_RGBA8));
#else
    return d->qctx->bindTexture(image, target, GL_RGBA);
#endif
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS

GLuint QGLPixelBuffer::bindTexture(const QImage &image, QMacCompatGLenum target)
{
    Q_D(QGLPixelBuffer);
    return d->qctx->bindTexture(image, target, QMacCompatGLint(GL_RGBA8));
}
#endif

GLuint QGLPixelBuffer::bindTexture(const QPixmap &pixmap, GLenum target)
{
    Q_D(QGLPixelBuffer);
#ifndef QT_OPENGL_ES
    return d->qctx->bindTexture(pixmap, target, GLint(GL_RGBA8));
#else
    return d->qctx->bindTexture(pixmap, target, GL_RGBA);
#endif
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS

GLuint QGLPixelBuffer::bindTexture(const QPixmap &pixmap, QMacCompatGLenum target)
{
    Q_D(QGLPixelBuffer);
    return d->qctx->bindTexture(pixmap, target, QMacCompatGLint(GL_RGBA8));
}
#endif

GLuint QGLPixelBuffer::bindTexture(const QString &fileName)
{
    Q_D(QGLPixelBuffer);
    return d->qctx->bindTexture(fileName);
}

void QGLPixelBuffer::deleteTexture(GLuint texture_id)
{
    Q_D(QGLPixelBuffer);
    d->qctx->deleteTexture(texture_id);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS

void QGLPixelBuffer::deleteTexture(QMacCompatGLuint texture_id)
{
    Q_D(QGLPixelBuffer);
    d->qctx->deleteTexture(texture_id);
}
#endif

void QGLPixelBuffer::drawTexture(const QRectF &target, GLuint textureId, GLenum textureTarget)
{
    Q_D(QGLPixelBuffer);
    d->qctx->drawTexture(target, textureId, textureTarget);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS

void QGLPixelBuffer::drawTexture(const QRectF &target, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
    Q_D(QGLPixelBuffer);
    d->qctx->drawTexture(target, textureId, textureTarget);
}
#endif

void QGLPixelBuffer::drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget)
{
    Q_D(QGLPixelBuffer);
    d->qctx->drawTexture(point, textureId, textureTarget);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS

void QGLPixelBuffer::drawTexture(const QPointF &point, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
    Q_D(QGLPixelBuffer);
    d->qctx->drawTexture(point, textureId, textureTarget);
}
#endif

QGLFormat QGLPixelBuffer::format() const
{
    Q_D(const QGLPixelBuffer);
    return d->format;
}

QT_END_NAMESPACE