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Core Wayland window system code and protocol
d68c7d8aed
This adds the wl_surface.set_buffer_scale request, and a wl_output.scale event. These together lets us support automatic upscaling of "old" clients on very high resolution monitors, while allowing "new" clients to take advantage of this to render at the higher resolution when the surface is displayed on the scaled output. It is similar to set_buffer_transform in that the buffer is stored in a transformed pixels (in this case scaled). This means that if an output is scaled we can directly use the pre-scaled buffer with additional data, rather than having to scale it. Additionally this adds a "scaled" flag to the wl_output.mode flags so that clients know which resolutions are native and which are scaled. Also, in places where the documentation was previously not clear as to what coordinate system was used this was fleshed out. It also adds a scaling_factor event to wl_output that specifies the scaling of an output. This is meant to be used for outputs with a very high DPI to tell the client that this particular output has subpixel precision. Coordinates in other parts of the protocol, like input events, relative window positioning and output positioning are still in the compositor space rather than the scaled space. However, input has subpixel precision so you can still get input at full resolution. This setup means global properties like mouse acceleration/speed, pointer size, monitor geometry, etc can be specified in a "mostly similar" resolution even on a multimonitor setup where some monitors are low dpi and some are e.g. retina-class outputs. |
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| cursor | ||
| doc | ||
| m4 | ||
| protocol | ||
| spec | ||
| src | ||
| tests | ||
| .gitignore | ||
| autogen.sh | ||
| configure.ac | ||
| COPYING | ||
| Makefile.am | ||
| README | ||
| TODO | ||
| wayland-scanner.m4.in | ||
| wayland-scanner.mk | ||
What is Wayland
Wayland is a project to define a protocol for a compositor to talk to
its clients as well as a library implementation of the protocol. The
compositor can be a standalone display server running on Linux kernel
modesetting and evdev input devices, an X application, or a wayland
client itself. The clients can be traditional applications, X servers
(rootless or fullscreen) or other display servers.
The wayland protocol is essentially only about input handling and
buffer management. The compositor receives input events and forwards
them to the relevant client. The clients creates buffers and renders
into them and notifies the compositor when it needs to redraw. The
protocol also handles drag and drop, selections, window management and
other interactions that must go through the compositor. However, the
protocol does not handle rendering, which is one of the features that
makes wayland so simple. All clients are expected to handle rendering
themselves, typically through cairo or OpenGL.
The weston compositor is a reference implementation of a wayland
compositor and the weston repository also includes a few example
clients.
Building the wayland libraries is fairly simple, aside from libffi,
they don't have many dependencies:
$ git clone git://anongit.freedesktop.org/wayland/wayland
$ cd wayland
$ ./autogen.sh --prefix=PREFIX
$ make
$ make install
where PREFIX is where you want to install the libraries. See
http://wayland.freedesktop.org for more complete build instructions
for wayland, weston, xwayland and various toolkits.