QWaylandShmBuffer Class Reference

#include <qwaylandshmsurface.h>

Inheritance diagram for QWaylandShmBuffer:

Public Functions
QImage *	image ()
	QWaylandShmBuffer (QWaylandDisplay *display, const QSize &size, QImage::Format format)
QSize	size () const
	~QWaylandShmBuffer ()
Public Functions inherited from QWaylandBuffer
wl_buffer *	buffer ()
	QWaylandBuffer ()
virtual	~QWaylandBuffer ()

Properties
QImage	mImage

Additional Inherited Members
Protected Variables inherited from QWaylandBuffer
struct wl_buffer *	mBuffer

Detailed Description

Definition at line 54 of file qwaylandshmsurface.h.

Constructors and Destructors

QWaylandShmBuffer()

QWaylandShmBuffer::QWaylandShmBuffer	(	QWaylandDisplay *	display,
		const QSize &	size,
		QImage::Format	format
	)

Definition at line 58 of file qwaylandshmsurface.cpp.

{
    int stride = size.width() * 4;
    int alloc = stride * size.height();
    char filename[] = "/tmp/wayland-shm-XXXXXX";
    int fd = mkstemp(filename);
    if (fd < 0)
    qWarning("open %s failed: %s", filename, strerror(errno));
    if (ftruncate(fd, alloc) < 0) {
    qWarning("ftruncate failed: %s", strerror(errno));
    close(fd);
    return;
    }
    uchar *data = (uchar *)
    mmap(NULL, alloc, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    unlink(filename);

    if (data == (uchar *) MAP_FAILED) {
    qWarning("mmap /dev/zero failed: %s", strerror(errno));
    close(fd);
    return;
    }

    mImage = QImage(data, size.width(), size.height(), stride, format);
    mBuffer = display->createShmBuffer(fd, size.width(), size.height(),
                       stride, display->argbVisual());
    close(fd);
}

~QWaylandShmBuffer()

QWaylandShmBuffer::~QWaylandShmBuffer

(

void

)

Definition at line 88 of file qwaylandshmsurface.cpp.

{
    munmap((void *) mImage.constBits(), mImage.byteCount());
    wl_buffer_destroy(mBuffer);
}

Functions

image()

QImage* QWaylandShmBuffer::image ( )

inline

Definition at line 60 of file qwaylandshmsurface.h.

Referenced by QWaylandCursor::changeCursor(), QWaylandShmWindowSurface::paintDevice(), QWaylandReadbackEglContext::swapBuffers(), and QWaylandReadbackGlxContext::swapBuffers().

{ return &mImage; }

size()

QSize QWaylandShmBuffer::size ( ) const

inlinevirtual

Implements QWaylandBuffer.

Definition at line 59 of file qwaylandshmsurface.h.

Referenced by QWaylandCursor::changeCursor(), and QWaylandShmWindowSurface::resize().

{ return mImage.size(); }

Properties

mImage

QImage QWaylandShmBuffer::mImage

private

Definition at line 62 of file qwaylandshmsurface.h.

Referenced by image(), QWaylandShmBuffer(), size(), and ~QWaylandShmBuffer().

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The documentation for this class was generated from the following files:

• /src/plugins/platforms/wayland/qwaylandshmsurface.h
• /src/plugins/platforms/wayland/qwaylandshmsurface.cpp