qgl_x11.cpp

奇趣公司比较新的qt/emd版本

            fmt.setDoubleBuffer(true);
            tryDouble = false;
            triedDouble = true;
            continue;
        } else if (triedDouble) {
            fmt.setDoubleBuffer(false);
            triedDouble = false;
        }
        if (!triedSample && fmt.sampleBuffers()) {
            fmt.setSampleBuffers(false);
            triedSample = true;
            continue;
        }
        if (fmt.stereo()) {
            fmt.setStereo(false);
            continue;
        }
        if (fmt.accum()) {
            fmt.setAccum(false);
            continue;
        }
        if (fmt.stencil()) {
            fmt.setStencil(false);
            continue;
        }
        if (fmt.alpha()) {
            fmt.setAlpha(false);
            continue;
        }
        if (fmt.depth()) {
            fmt.setDepth(false);
            continue;
        }
        if (fmt.doubleBuffer()) {
            fmt.setDoubleBuffer(false);
            continue;
        }
        fail = true;
    }
    d->glFormat = fmt;
    return vis;
}


/*!

  \internal

  \bold{X11 only:} This virtual function chooses a visual
  that matches the OpenGL \link format() format\endlink. Reimplement this
  function in a subclass if you need a custom visual.

  \sa chooseContext()
*/

void *QGLContext::tryVisual(const QGLFormat& f, int bufDepth)
{
    Q_D(QGLContext);
    int spec[40];
    int i = 0;
    spec[i++] = GLX_LEVEL;
    spec[i++] = f.plane();
    const QX11Info *xinfo = qt_x11Info(d->paintDevice);

#if defined(GLX_VERSION_1_1) && defined(GLX_EXT_visual_info)
    static bool useTranspExt = false;
    static bool useTranspExtChecked = false;
    if (f.plane() && !useTranspExtChecked && d->paintDevice) {
        QByteArray estr(glXQueryExtensionsString(xinfo->display(), xinfo->screen()));
        useTranspExt = estr.contains("GLX_EXT_visual_info");
        //# (A bit simplistic; that could theoretically be a substring)
        if (useTranspExt) {
            QByteArray cstr(glXGetClientString(xinfo->display(), GLX_VENDOR));
            useTranspExt = !cstr.contains("Xi Graphics"); // bug workaround
            if (useTranspExt) {
                // bug workaround - some systems (eg. FireGL) refuses to return an overlay
                // visual if the GLX_TRANSPARENT_TYPE_EXT attribute is specified, even if
                // the implementation supports transparent overlays
                int tmpSpec[] = { GLX_LEVEL, f.plane(), GLX_TRANSPARENT_TYPE_EXT,
                                  f.rgba() ? GLX_TRANSPARENT_RGB_EXT : GLX_TRANSPARENT_INDEX_EXT,
                                  XNone };
                XVisualInfo * vinf = glXChooseVisual(xinfo->display(), xinfo->screen(), tmpSpec);
                if (!vinf) {
                    useTranspExt = false;
                }
            }
        }

        useTranspExtChecked = true;
    }
    if (f.plane() && useTranspExt) {
        // Required to avoid non-transparent overlay visual(!) on some systems
        spec[i++] = GLX_TRANSPARENT_TYPE_EXT;
        spec[i++] = f.rgba() ? GLX_TRANSPARENT_RGB_EXT : GLX_TRANSPARENT_INDEX_EXT;
    }
#endif

    if (f.doubleBuffer())
        spec[i++] = GLX_DOUBLEBUFFER;
    if (f.depth()) {
        spec[i++] = GLX_DEPTH_SIZE;
        spec[i++] = f.depthBufferSize() == -1 ? 1 : f.depthBufferSize();
    }
    if (f.stereo()) {
        spec[i++] = GLX_STEREO;
    }
    if (f.stencil()) {
        spec[i++] = GLX_STENCIL_SIZE;
        spec[i++] = f.stencilBufferSize() == -1 ? 1 : f.stencilBufferSize();
    }
    if (f.rgba()) {
        spec[i++] = GLX_RGBA;
        spec[i++] = GLX_RED_SIZE;
        spec[i++] = f.redBufferSize() == -1 ? 1 : f.redBufferSize();
        spec[i++] = GLX_GREEN_SIZE;
        spec[i++] = f.greenBufferSize() == -1 ? 1 : f.greenBufferSize();
        spec[i++] = GLX_BLUE_SIZE;
        spec[i++] = f.blueBufferSize() == -1 ? 1 : f.blueBufferSize();
        if (f.alpha()) {
            spec[i++] = GLX_ALPHA_SIZE;
            spec[i++] = f.alphaBufferSize() == -1 ? 1 : f.alphaBufferSize();
        }
        if (f.accum()) {
            spec[i++] = GLX_ACCUM_RED_SIZE;
            spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
            spec[i++] = GLX_ACCUM_GREEN_SIZE;
            spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
            spec[i++] = GLX_ACCUM_BLUE_SIZE;
            spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
            if (f.alpha()) {
                spec[i++] = GLX_ACCUM_ALPHA_SIZE;
                spec[i++] = f.accumBufferSize() == -1 ? 1 : f.accumBufferSize();
            }
        }
    } else {
        spec[i++] = GLX_BUFFER_SIZE;
        spec[i++] = bufDepth;
    }

    if (f.sampleBuffers()) {
        spec[i++] = GLX_SAMPLE_BUFFERS_ARB;
        spec[i++] = 1;
        spec[i++] = GLX_SAMPLES_ARB;
        spec[i++] = f.samples() == -1 ? 4 : f.samples();
    }

    spec[i] = XNone;
    return glXChooseVisual(xinfo->display(), xinfo->screen(), spec);
}


void QGLContext::reset()
{
    Q_D(QGLContext);
    if (!d->valid)
        return;
    const QX11Info *xinfo = qt_x11Info(d->paintDevice);
    doneCurrent();
    if (d->gpm)
        glXDestroyGLXPixmap(xinfo->display(), (GLXPixmap)d->gpm);
    d->gpm = 0;
    glXDestroyContext(xinfo->display(), (GLXContext)d->cx);
    if (d->vi)
        XFree(d->vi);
    d->vi = 0;
    d->cx = 0;
    d->crWin = false;
    d->sharing = false;
    d->valid = false;
    d->transpColor = QColor();
    d->initDone = false;
    qgl_share_reg()->removeShare(this);
}


void QGLContext::makeCurrent()
{
    Q_D(QGLContext);
    if (!d->valid) {
        qWarning("QGLContext::makeCurrent(): Cannot make invalid context current.");
        return;
    }
    const QX11Info *xinfo = qt_x11Info(d->paintDevice);
    bool ok = true;
    if (d->paintDevice->devType() == QInternal::Pixmap) {
        ok = glXMakeCurrent(xinfo->display(), (GLXPixmap)d->gpm, (GLXContext)d->cx);
    } else if (d->paintDevice->devType() == QInternal::Pbuffer) {
        ok = glXMakeCurrent(xinfo->display(), (GLXPbuffer)d->pbuf, (GLXContext)d->cx);
    } else if (d->paintDevice->devType() == QInternal::Widget) {
        ok = glXMakeCurrent(xinfo->display(), ((QWidget *)d->paintDevice)->winId(), (GLXContext)d->cx);
    }
    if (!ok)
        qWarning("QGLContext::makeCurrent(): Failed.");

    if (ok) {
        if (!qgl_context_storage.hasLocalData() && QThread::currentThread())
            qgl_context_storage.setLocalData(new QGLThreadContext);
        if (qgl_context_storage.hasLocalData())
            qgl_context_storage.localData()->context = this;
        currentCtx = this;
    }
}

void QGLContext::doneCurrent()
{
    Q_D(QGLContext);
    glXMakeCurrent(qt_x11Info(d->paintDevice)->display(), 0, 0);
    if (qgl_context_storage.hasLocalData())
        qgl_context_storage.localData()->context = 0;
    currentCtx = 0;
}


void QGLContext::swapBuffers() const
{
    Q_D(const QGLContext);
    if (!d->valid)
        return;
    if (!deviceIsPixmap())
        glXSwapBuffers(qt_x11Info(d->paintDevice)->display(),
                       static_cast<QWidget *>(d->paintDevice)->winId());
}

QColor QGLContext::overlayTransparentColor() const
{
    if (isValid())
        return Qt::transparent;
    return QColor();                // Invalid color
}

static uint qt_transparent_pixel(VisualID id, int screen)
{
    for (int i = 0; i < trans_colors.size(); i++) {
        if (trans_colors[i].vis == id && trans_colors[i].screen == screen)
            return trans_colors[i].color;
    }
    return 0;
}

uint QGLContext::colorIndex(const QColor& c) const
{
    Q_D(const QGLContext);
    int screen = ((XVisualInfo *)d->vi)->screen;
    QColormap colmap = QColormap::instance(screen);
    if (isValid()) {
        if (format().plane() && c == Qt::transparent) {
            return qt_transparent_pixel(((XVisualInfo *)d->vi)->visualid,
                                        ((XVisualInfo *)d->vi)->screen);
        }
        if (((XVisualInfo*)d->vi)->visualid ==
             XVisualIDFromVisual((Visual *) QX11Info::appVisual(screen)))
            return colmap.pixel(c);                // We're using QColor's cmap

        XVisualInfo *info = (XVisualInfo *) d->vi;
        CMapEntryHash *hash = cmap_handler()->cmap_hash;
        CMapEntryHash::ConstIterator it = hash->constFind(long(info->visualid)
                + (info->screen * 256));
        QCMapEntry *x = 0;
        if (it != hash->constEnd())
            x = it.value();
        if (x && !x->alloc) {                // It's a standard colormap
            int rf = (int)(((float)c.red() * (x->scmap.red_max+1))/256.0);
            int gf = (int)(((float)c.green() * (x->scmap.green_max+1))/256.0);
            int bf = (int)(((float)c.blue() * (x->scmap.blue_max+1))/256.0);
            uint p = x->scmap.base_pixel
                     + (rf * x->scmap.red_mult)
                     + (gf * x->scmap.green_mult)
                     + (bf * x->scmap.blue_mult);
            return p;
        } else {
            QMap<int, QRgb> &cmap = (*cmap_handler()->qglcmap_hash)[(long)info->visualid];

            // already in the map?
            QRgb target = c.rgb();
            QMap<int, QRgb>::Iterator it = cmap.begin();
            for (; it != cmap.end(); ++it) {
                if ((*it) == target)
                    return it.key();
            }

            // need to alloc color
            unsigned long plane_mask[2];
            unsigned long color_map_entry;
            if (!XAllocColorCells (QX11Info::display(), x->cmap, true, plane_mask, 0,
                                   &color_map_entry, 1))
                return colmap.pixel(c);

            XColor col;
            col.flags = DoRed | DoGreen | DoBlue;
            col.pixel = color_map_entry;
            col.red   = (ushort)((qRed(c.rgb()) / 255.0) * 65535.0 + 0.5);
            col.green = (ushort)((qGreen(c.rgb()) / 255.0) * 65535.0 + 0.5);
            col.blue  = (ushort)((qBlue(c.rgb()) / 255.0) * 65535.0 + 0.5);
            XStoreColor(QX11Info::display(), x->cmap, &col);

            cmap.insert(color_map_entry, target);
            return color_map_entry;
        }
    }
    return 0;
}

#ifndef QT_NO_FONTCONFIG
/*! \internal
    This is basically a substitute for glxUseXFont() which can only
    handle XLFD fonts. This version relies on freetype to render the
    glyphs, but it works with all fonts that fontconfig provides - both
    antialiased and aliased bitmap and outline fonts.
*/
static void qgl_use_font(QFontEngineFT *engine, int first, int count, int listBase)
{
    GLfloat color[4];
    glGetFloatv(GL_CURRENT_COLOR, color);

    // save the pixel unpack state
    GLint gl_swapbytes, gl_lsbfirst, gl_rowlength, gl_skiprows, gl_skippixels, gl_alignment;
    glGetIntegerv (GL_UNPACK_SWAP_BYTES, &gl_swapbytes);
    glGetIntegerv (GL_UNPACK_LSB_FIRST, &gl_lsbfirst);
    glGetIntegerv (GL_UNPACK_ROW_LENGTH, &gl_rowlength);
    glGetIntegerv (GL_UNPACK_SKIP_ROWS, &gl_skiprows);
    glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &gl_skippixels);
    glGetIntegerv (GL_UNPACK_ALIGNMENT, &gl_alignment);

    glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
    glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    const bool antialiased = engine->drawAntialiased();
    FT_Face face = engine->lockFace();

    // start generating font glyphs
    for (int i = first; i < count; ++i) {
        int list = listBase + i;
        GLfloat x0, y0, dx, dy;

        FT_Error err;

        err = FT_Load_Glyph(face, FT_Get_Char_Index(face, i), FT_LOAD_DEFAULT);
        if (err) {
            qDebug("failed loading glyph %d from font", i);
            Q_ASSERT(!err);
        }
        err = FT_Render_Glyph(face->glyph, (antialiased ? ft_render_mode_normal
                                            : ft_render_mode_mono));
        if (err) {
            qDebug("failed rendering glyph %d from font", i);
            Q_ASSERT(!err);
        }

        FT_Bitmap bm = face->glyph->bitmap;
        x0 = face->glyph->metrics.horiBearingX >> 6;
        y0 = (face->glyph->metrics.height - face->glyph->metrics.horiBearingY) >> 6;
        dx = face->glyph->metrics.horiAdvance >> 6;
        dy = 0;
        int sz = bm.pitch * bm.rows;
        uint *aa_glyph = 0;
        uchar *ua_glyph = 0;

        if (antialiased)
            aa_glyph = new uint[sz];
        else
            ua_glyph = new uchar[sz];

        // convert to GL format
        for (int y = 0; y < bm.rows; ++y) {
            for (int x = 0; x < bm.pitch; ++x) {
                int c1 = y*bm.pitch + x;
                int c2 = (bm.rows - y - 1) > 0 ? (bm.rows-y-1)*bm.pitch + x : x;
                if (antialiased) {
                    aa_glyph[c1] = (int(color[0]*255) << 24)
                                   | (int(color[1]*255) << 16)
                                   | (int(color[2]*255) << 8) | bm.buffer[c2];
                } else {
                    ua_glyph[c1] = bm.buffer[c2];
                }
            }
        }

        glNewList(list, GL_COMPILE);
        if (antialiased) {
            // calling glBitmap() is just a trick to move the current
            // raster pos, since glGet*() won't work in display lists
            glBitmap(0, 0, 0, 0, x0, -y0, 0);
            glDrawPixels(bm.pitch, bm.rows, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, aa_glyph);
            glBitmap(0, 0, 0, 0, dx-x0, y0, 0);
        } else {
            glBitmap(bm.pitch*8, bm.rows, -x0, y0, dx, dy, ua_glyph);
        }
        glEndList();
        antialiased ? delete[] aa_glyph : delete[] ua_glyph;
    }

    engine->unlockFace();

    // restore pixel unpack settings
    glPixelStorei(GL_UNPACK_SWAP_BYTES, gl_swapbytes);
    glPixelStorei(GL_UNPACK_LSB_FIRST, gl_lsbfirst);
    glPixelStorei(GL_UNPACK_ROW_LENGTH, gl_rowlength);
    glPixelStorei(GL_UNPACK_SKIP_ROWS, gl_skiprows);
    glPixelStorei(GL_UNPACK_SKIP_PIXELS, gl_skippixels);
    glPixelStorei(GL_UNPACK_ALIGNMENT, gl_alignment);
}
#endif

#undef d
void QGLContext::generateFontDisplayLists(const QFont & fnt, int listBase)
{
    QFont f(fnt);
    QFontEngine *engine = f.d->engineForScript(QUnicodeTables::Common);

    if (engine->type() == QFontEngine::Multi)
        engine = static_cast<QFontEngineMulti *>(engine)->engine(0);
#ifndef QT_NO_FONTCONFIG
    if(engine->type() == QFontEngine::Freetype) {
        qgl_use_font(static_cast<QFontEngineFT *>(engine), 0, 256, listBase);
        return;
    }
#endif
    // glXUseXFont() only works with XLFD font structures and a few GL
    // drivers crash if 0 is passed as the font handle
    f.setStyleStrategy(QFont::OpenGLCompatible);
    if (f.handle() && engine->type() == QFontEngine::XLFD)
        glXUseXFont(static_cast<Font>(f.handle()), 0, 256, listBase);
}

/*!
    Returns a function pointer to the GL extension function passed in
    \a proc. 0 is returned if a pointer to the function could not be
    obtained.
*/
void *QGLContext::getProcAddress(const QString &proc) const
{
    typedef void *(*qt_glXGetProcAddressARB)(const GLubyte *);
    static qt_glXGetProcAddressARB glXGetProcAddressARB = 0;
    static bool resolved = false;

    if (resolved && !glXGetProcAddressARB)
        return 0;
    if (!glXGetProcAddressARB) {
        QString glxExt = QString(QLatin1String(glXGetClientString(QX11Info::display(), GLX_EXTENSIONS)));
        if (glxExt.contains(QLatin1String("GLX_ARB_get_proc_address"))) {
            extern const QString qt_gl_library_name();
            QLibrary lib(qt_gl_library_name());
            glXGetProcAddressARB = (qt_glXGetProcAddressARB) lib.resolve("glXGetProcAddressARB");
        }
        resolved = true;
    }
    if (!glXGetProcAddressARB)
        return 0;
    return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(proc.toLatin1().data()));
}

/*****************************************************************************
  QGLOverlayWidget (Internal overlay class for X11)
 *****************************************************************************/

class QGLOverlayWidget : public QGLWidget
{
    Q_OBJECT