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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QLoggingCategory>
#include "qxlibeglintegration_p.h"
Q_LOGGING_CATEGORY(lcXlibEglDebug, "qt.egl.xlib.debug")
VisualID QXlibEglIntegration::getCompatibleVisualId(Display *display, EGLDisplay eglDisplay, EGLConfig config)
{
VisualID visualId = 0;
EGLint eglValue = 0;
EGLint configRedSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_RED_SIZE, &configRedSize);
EGLint configGreenSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_GREEN_SIZE, &configGreenSize);
EGLint configBlueSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_BLUE_SIZE, &configBlueSize);
EGLint configAlphaSize = 0;
eglGetConfigAttrib(eglDisplay, config, EGL_ALPHA_SIZE, &configAlphaSize);
eglGetConfigAttrib(eglDisplay, config, EGL_CONFIG_ID, &eglValue);
int configId = eglValue;
// See if EGL provided a valid VisualID:
eglGetConfigAttrib(eglDisplay, config, EGL_NATIVE_VISUAL_ID, &eglValue);
visualId = (VisualID)eglValue;
if (visualId) {
// EGL has suggested a visual id, so get the rest of the visual info for that id:
XVisualInfo visualInfoTemplate;
memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
visualInfoTemplate.visualid = visualId;
XVisualInfo *chosenVisualInfo;
int matchingCount = 0;
chosenVisualInfo = XGetVisualInfo(display, VisualIDMask, &visualInfoTemplate, &matchingCount);
if (chosenVisualInfo) {
// Skip size checks if implementation supports non-matching visual
// and config (http://bugreports.qt-project.org/browse/QTBUG-9444).
if (q_hasEglExtension(eglDisplay,"EGL_NV_post_convert_rounding")) {
XFree(chosenVisualInfo);
return visualId;
}
int visualRedSize = qPopulationCount(chosenVisualInfo->red_mask);
int visualGreenSize = qPopulationCount(chosenVisualInfo->green_mask);
int visualBlueSize = qPopulationCount(chosenVisualInfo->blue_mask);
int visualAlphaSize = chosenVisualInfo->depth == 32 ? 8 : 0;
const bool visualMatchesConfig = visualRedSize == configRedSize
&& visualGreenSize == configGreenSize
&& visualBlueSize == configBlueSize
&& visualAlphaSize == configAlphaSize;
// In some cases EGL tends to suggest a 24-bit visual for 8888
// configs. In such a case we have to fall back to XGetVisualInfo.
if (!visualMatchesConfig) {
visualId = 0;
qCDebug(lcXlibEglDebug,
"EGL suggested using X Visual ID %d (%d %d %d depth %d) for EGL config %d"
"(%d %d %d %d), but this is incompatible",
(int)visualId, visualRedSize, visualGreenSize, visualBlueSize, chosenVisualInfo->depth,
configId, configRedSize, configGreenSize, configBlueSize, configAlphaSize);
}
} else {
qCDebug(lcXlibEglDebug, "EGL suggested using X Visual ID %d for EGL config %d, but that isn't a valid ID",
(int)visualId, configId);
visualId = 0;
}
XFree(chosenVisualInfo);
}
else
qCDebug(lcXlibEglDebug, "EGL did not suggest a VisualID (EGL_NATIVE_VISUAL_ID was zero) for EGLConfig %d", configId);
if (visualId) {
qCDebug(lcXlibEglDebug, configAlphaSize > 0
? "Using ARGB Visual ID %d provided by EGL for config %d"
: "Using Opaque Visual ID %d provided by EGL for config %d", (int)visualId, configId);
return visualId;
}
// Finally, try to use XGetVisualInfo and only use the bit depths to match on:
if (!visualId) {
XVisualInfo visualInfoTemplate;
memset(&visualInfoTemplate, 0, sizeof(XVisualInfo));
XVisualInfo *matchingVisuals;
int matchingCount = 0;
visualInfoTemplate.depth = configRedSize + configGreenSize + configBlueSize + configAlphaSize;
matchingVisuals = XGetVisualInfo(display,
VisualDepthMask,
&visualInfoTemplate,
&matchingCount);
if (!matchingVisuals) {
// Try again without taking the alpha channel into account:
visualInfoTemplate.depth = configRedSize + configGreenSize + configBlueSize;
matchingVisuals = XGetVisualInfo(display,
VisualDepthMask,
&visualInfoTemplate,
&matchingCount);
}
if (matchingVisuals) {
visualId = matchingVisuals[0].visualid;
XFree(matchingVisuals);
}
}
if (visualId) {
qCDebug(lcXlibEglDebug, "Using Visual ID %d provided by XGetVisualInfo for EGL config %d", (int)visualId, configId);
return visualId;
}
qWarning("Unable to find an X11 visual which matches EGL config %d", configId);
return (VisualID)0;
}
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