C++ qt_gl_share_widget函数代码示例

QImage QEglGLPixmapData::toImage() const
{
    TRACE();
    // We should not do so many toImage calls alltogether. This is what is slowing us down right now.
    // QWK should keep a cache of transformed images instead of re-doing it every frame.
    // FIXME make QWebKit not do so many QPixmap(QImage(pixmap.toImage).transform()) style transformations.
    if (!isValid())
        return QImage();

    if (!m_source.isNull()) {
        return m_source;
    } else if (m_dirty || m_hasFillColor) {
        m_source = fillImage(m_fillColor);
        return m_source;
    } else {
        ensureCreated();
    }
    // read the image from the FBO to memory
    if(m_fbo) {
        // we read the data back from the fbo
        m_ctx->makeCurrent();
        QGLShareContextScope ctx(qt_gl_share_widget()->context());
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
        // this does glReadPixels - not very fast!
        QImage temp=qt_gl_read_framebuffer(QSize(w, h), true, true);
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
        m_source=temp;
        m_ctx->doneCurrent();
        return temp;
    }
    else if (m_texture.id) {
        // we read back from the texture by binding its id as a framebuffer
        // is this in the OpenGL standard? It seems to work
        m_ctx->makeCurrent();
        QGLShareContextScope ctx(qt_gl_share_widget()->context());
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_texture.id);
        // this does glReadPixels - not very fast
        QImage temp=qt_gl_read_framebuffer(QSize(w, h), true, true);
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo);
        // should we cache the fetched image locally to speed up future access?
        // m_source=temp;
        m_ctx->doneCurrent();
        return temp;
    }
    else {
        QImage temp(w,h, QImage::Format_ARGB32_Premultiplied);
        // FIXME indicating something went wrong, neither of above cases worked - look out for yellow images
        temp.fill(Qt::yellow);
        m_source=temp;
        return temp;
    }

}

void QGLPixmapData::resize(int width, int height)
{
    if (width == w && height == h)
        return;

    if (width <= 0 || height <= 0) {
        width = 0;
        height = 0;
    }

    w = width;
    h = height;
    is_null = (w <= 0 || h <= 0);
    d = pixelType() == QPixmapData::PixmapType ? 32 : 1;

    if (m_texture.id) {
        QGLShareContextScope ctx(qt_gl_share_widget()->context());
        glDeleteTextures(1, &m_texture.id);
        m_texture.id = 0;
    }

    m_source = QImage();
    m_dirty = isValid();
    setSerialNumber(++qt_gl_pixmap_serial);
}

bool QGLPixmapData::fromFile(const QString &filename, const char *format,
                             Qt::ImageConversionFlags flags)
{
    if (pixelType() == QPixmapData::BitmapType)
        return QPixmapData::fromFile(filename, format, flags);
    QFile file(filename);
    if (!file.open(QIODevice::ReadOnly))
        return false;
    QByteArray data = file.peek(64);
    bool alpha;
    if (m_texture.canBindCompressedTexture
            (data.constData(), data.size(), format, &alpha)) {
        resize(0, 0);
        data = file.readAll();
        file.close();
        QGLShareContextScope ctx(qt_gl_share_widget()->context());
        QSize size = m_texture.bindCompressedTexture
            (data.constData(), data.size(), format);
        if (!size.isEmpty()) {
            w = size.width();
            h = size.height();
            is_null = false;
            d = 32;
            m_hasAlpha = alpha;
            m_source = QImage();
            m_dirty = isValid();
            return true;
        }
        return false;
    }
    fromImage(QImageReader(&file, format).read(), flags);
    return !isNull();
}

void QMeeGoLivePixmapData::initializeThroughEGLImage()
{
    if (texture()->id != 0)
        return;

    QGLShareContextScope ctx(qt_gl_share_widget()->context());
    QMeeGoExtensions::ensureInitialized();

    EGLImageKHR eglImage = EGL_NO_IMAGE_KHR;
    GLuint newTextureId = 0;

    eglImage = QEgl::eglCreateImageKHR(QEgl::display(), EGL_NO_CONTEXT, EGL_NATIVE_PIXMAP_KHR,
                                       (EGLClientBuffer) backingX11Pixmap->handle(), preserved_attribs);

    if (eglImage == EGL_NO_IMAGE_KHR) {
        qWarning("eglCreateImageKHR failed (live texture)!");
        return;
    }

    glGenTextures(1, &newTextureId);
    glBindTexture(GL_TEXTURE_2D, newTextureId);

    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (EGLImageKHR) eglImage);
    if (glGetError() == GL_NO_ERROR) {
        resize(backingX11Pixmap->width(), backingX11Pixmap->height());
        texture()->id = newTextureId;
        texture()->options &= ~QGLContext::InvertedYBindOption;
        m_hasAlpha = backingX11Pixmap->hasAlphaChannel();
    } else {
        qWarning("Failed to create a texture from an egl image (live texture)!");
        glDeleteTextures(1, &newTextureId);
    }

    QEgl::eglDestroyImageKHR(QEgl::display(), eglImage);
}

bool QGLPixmapData::isValidContext(const QGLContext *ctx) const
{
    if (ctx == m_ctx)
        return true;

    const QGLContext *share_ctx = qt_gl_share_widget()->context();
    return ctx == share_ctx || QGLContext::areSharing(ctx, share_ctx);
}

void QGLPixmapData::ensureCreated() const
{
    if (!m_dirty)
        return;

    m_dirty = false;

    if (nativeImageHandleProvider && !nativeImageHandle)
        const_cast<QGLPixmapData *>(this)->createFromNativeImageHandleProvider();

    QGLShareContextScope ctx(qt_gl_share_widget()->context());
    m_ctx = ctx;

#ifdef QT_SYMBIAN_SUPPORTS_SGIMAGE
    if (m_sgImage) {
        qt_resolve_eglimage_gl_extensions(ctx); // ensure initialized

        bool textureIsBound = false;
        GLuint newTextureId;

        EGLint imgAttr[] = { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE };
        EGLImageKHR image = QEgl::eglCreateImageKHR(QEgl::display()
                                                , EGL_NO_CONTEXT
                                                , EGL_NATIVE_PIXMAP_KHR
                                                , (EGLClientBuffer)m_sgImage
                                                , imgAttr);

        glGenTextures(1, &newTextureId);
        glBindTexture( GL_TEXTURE_2D, newTextureId);

        if (image != EGL_NO_IMAGE_KHR) {
            glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
            GLint err = glGetError();
            if (err == GL_NO_ERROR)
                textureIsBound = true;

            QEgl::eglDestroyImageKHR(QEgl::display(), image);
        }

        if (textureIsBound) {
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

            m_texture.id = newTextureId;
            m_texture.boundPixmap = const_cast<QGLPixmapData*>(this);
            QGLSgImageTextureCleanup::cleanupForContext(m_ctx)->insert(m_texture.id, const_cast<QGLPixmapData*>(this));
        } else {
            qWarning("QGLPixmapData: Failed to create texture from a SgImage image of size %dx%d", w, h);
            glDeleteTextures(1, &newTextureId);
        }
    }
#endif
}

bool QMeeGoPixmapData::destroyEGLSharedImage(Qt::HANDLE h)
{
    QGLShareContextScope ctx(qt_gl_share_widget()->context());   
    QMeeGoExtensions::ensureInitialized();

    QMutableHashIterator <void*, QMeeGoImageInfo*> i(sharedImagesMap);
    while (i.hasNext()) {
        i.next();
        if (i.value()->handle == h)
            i.remove();
    }

    return QMeeGoExtensions::eglDestroySharedImageNOK(QEgl::display(), (EGLNativeSharedImageTypeNOK) h);
}

void QGLPixmapData::destroyTexture()
{
    if (m_texture.id) {
        QGLWidget *shareWidget = qt_gl_share_widget();
        if (shareWidget) {
            m_texture.options |= QGLContext::MemoryManagedBindOption;
            m_texture.freeTexture();
            m_texture.options &= ~QGLContext::MemoryManagedBindOption;
        } else if(QGLContext::currentContext()) {
            glDeleteTextures(1, &m_texture.id);
            m_texture.id = 0;
            m_texture.boundPixmap = 0;
            m_texture.boundKey = 0;
        }
        m_ctx = 0;
        m_dirty = true;
    }
}

QImage QGLPixmapData::toImage() const
{
    if (!isValid())
        return QImage();

    if (m_renderFbo) {
        copyBackFromRenderFbo(true);
    } else if (!m_source.isNull()) {
        return m_source;
    } else if (m_dirty || m_hasFillColor) {
        return fillImage(m_fillColor);
    } else {
        ensureCreated();
    }

    QGLShareContextScope ctx(qt_gl_share_widget()->context());
    glBindTexture(GL_TEXTURE_2D, m_texture.id);
    return qt_gl_read_texture(QSize(w, h), true, true);
}

bool QGLPixmapData::fromData(const uchar *buffer, uint len, const char *format,
                             Qt::ImageConversionFlags flags)
{
    bool alpha;
    const char *buf = reinterpret_cast<const char *>(buffer);
    if (m_texture.canBindCompressedTexture(buf, int(len), format, &alpha)) {
        resize(0, 0);
        QGLShareContextScope ctx(qt_gl_share_widget()->context());
        QSize size = m_texture.bindCompressedTexture(buf, int(len), format);
        if (!size.isEmpty()) {
            w = size.width();
            h = size.height();
            is_null = false;
            d = 32;
            m_hasAlpha = alpha;
            m_source = QImage();
            m_dirty = isValid();
            return true;
        }
    }
    return QPixmapData::fromData(buffer, len, format, flags);
}

void QGLWidget::resizeEvent(QResizeEvent *e)
{
    Q_D(QGLWidget);
    if (!isValid())
        return;

    // Shared widget can ignore resize events which
    // may happen due to orientation change
    if (this == qt_gl_share_widget())
        return;

    if (!d->surfaceSizeInitialized || e->oldSize() != e->size()) {
        // On Symbian we need to recreate the surface on resize.
        d->recreateEglSurface();
        d->surfaceSizeInitialized = true;
    }

    makeCurrent();

    if (!d->glcx->initialized())
        glInit();

    resizeGL(width(), height());
}