diff options
Diffstat (limited to 'src/plugins/platforms/xcb/qxcbscreen.cpp')
-rw-r--r-- | src/plugins/platforms/xcb/qxcbscreen.cpp | 66 |
1 files changed, 65 insertions, 1 deletions
diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp index 67a9b2f190..4cb1b29152 100644 --- a/src/plugins/platforms/xcb/qxcbscreen.cpp +++ b/src/plugins/platforms/xcb/qxcbscreen.cpp @@ -47,6 +47,7 @@ #include <stdio.h> #include <QDebug> +#include <QtAlgorithms> #include <qpa/qwindowsysteminterface.h> #include <private/qmath_p.h> @@ -359,6 +360,69 @@ void QXcbScreen::windowShown(QXcbWindow *window) } } +QSurfaceFormat QXcbScreen::surfaceFormatFor(const QSurfaceFormat &format) const +{ + const xcb_visualid_t xcb_visualid = connection()->hasDefaultVisualId() ? connection()->defaultVisualId() + : screen()->root_visual; + const xcb_visualtype_t *xcb_visualtype = visualForId(xcb_visualid); + + const int redSize = qPopulationCount(xcb_visualtype->red_mask); + const int greenSize = qPopulationCount(xcb_visualtype->green_mask); + const int blueSize = qPopulationCount(xcb_visualtype->blue_mask); + + QSurfaceFormat result = format; + + if (result.redBufferSize() < 0) + result.setRedBufferSize(redSize); + + if (result.greenBufferSize() < 0) + result.setGreenBufferSize(greenSize); + + if (result.blueBufferSize() < 0) + result.setBlueBufferSize(blueSize); + + return result; +} + +const xcb_visualtype_t *QXcbScreen::visualForFormat(const QSurfaceFormat &format) const +{ + QVector<const xcb_visualtype_t *> candidates; + + for (auto ii = m_visuals.constBegin(); ii != m_visuals.constEnd(); ++ii) { + const xcb_visualtype_t &xcb_visualtype = ii.value(); + + const int redSize = qPopulationCount(xcb_visualtype.red_mask); + const int greenSize = qPopulationCount(xcb_visualtype.green_mask); + const int blueSize = qPopulationCount(xcb_visualtype.blue_mask); + const int alphaSize = depthOfVisual(xcb_visualtype.visual_id) - redSize - greenSize - blueSize; + + if (format.redBufferSize() != -1 && redSize != format.redBufferSize()) + continue; + + if (format.greenBufferSize() != -1 && greenSize != format.greenBufferSize()) + continue; + + if (format.blueBufferSize() != -1 && blueSize != format.blueBufferSize()) + continue; + + if (format.alphaBufferSize() != -1 && alphaSize != format.alphaBufferSize()) + continue; + + candidates.append(&xcb_visualtype); + } + + if (candidates.isEmpty()) + return nullptr; + + // Try to find a RGB visual rather than e.g. BGR or GBR + for (const xcb_visualtype_t *candidate : qAsConst(candidates)) + if (qCountTrailingZeroBits(candidate->blue_mask) == 0) + return candidate; + + // Did not find anything we like, just grab the first one and hope for the best + return candidates.first(); +} + void QXcbScreen::sendStartupMessage(const QByteArray &message) const { xcb_window_t rootWindow = root(); @@ -403,7 +467,7 @@ quint8 QXcbScreen::depthOfVisual(xcb_visualid_t visualid) const QImage::Format QXcbScreen::format() const { - return QImage::Format_RGB32; + return qt_xcb_imageFormatForVisual(connection(), screen()->root_depth, visualForId(screen()->root_visual)); } QDpi QXcbScreen::virtualDpi() const |