In case of native graphics system nothing is changed for the moment - the
X11Pixmap-QPixmap bridge is continued to be used.
But in case of graphics system raster (or Qt5) this relationship is no
longer used. Instead the QPixmap is converted to a QImage and the image
bits are put into the created X11Pixmap for this XRenderPicture.
Note: Qt5 uses shm to transfer image data to drawables. This seems
unsuited in this case as it's only a one time transformation.
For Qt5 the native pixmap block needs to be removed and the ctor might be
changed to taking an QImage as argument to make more clear that there is
no mapping from QPixmap to X11Pixmap.
Instead of having a pointer to a QPixmap the offscreen target holds an
xcb_render_picture_t. To make this possible in SceneWindow the tempPixmap
is changed from a QPixmap* to a XRenderPicture*. QPixmap was only used
for convenience.
ScreenShot Effect as only user of the offscreen target is adjusted but
as it needs a QImage, still uses a QPixmap wrapper.
This follows how it is done for OpenGL where the renderRoundBox() got
dropped some time ago.
New implementation implements the box with round corners using xrender
directly instead of using a QPainter on a QPixmap.
Use xcb to create and manage the X11 backend of Outline. In addition the
used background pixmaps are rendered with XRender instead of using a
QPainter on a QPixmap. This is done because QPixmap is no longer bound to
an X Pixmap.
To create the XRender Picture the available functionality from
kwinxrenderutils is used. To be able to use it in KWin core the compile
option to build without XRender is removed for kwinxrenderutils, but
still supported for effects.
Obviously the port to XCB is not complete as xremderutils itself is still
on XLib.
REVIEW: 108642
Second part of cleaning up the lib directory: the effects library
now lives in libkwineffects/ directory.
For existing effects nothing changes as the install path is unchanged.
The change obsoletes the lib/ directory.
As glplatform.h has not yet been exported I dared to export it and
adjust the places where it is used.
CCMAIL: kwin@kde.org
Martin Gräßlin