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The new protocol adds support for more native communication of fractional scaling. Everything in the wayland backend already existed only our fractional scale was calculated implicitly through a combination of output size guesswork for fullscreen windows. This new protocol makes that explicit, providing a more robust solution and a solution for non-fullscreen surfaces. The fallback code is still left in place for now whilst compositors gain support.
103 lines
4.5 KiB
XML
103 lines
4.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="fractional_scale_v1">
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<copyright>
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Copyright © 2022 Kenny Levinsen
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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</copyright>
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<description summary="Protocol for requesting fractional surface scales">
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This protocol allows a compositor to suggest for surfaces to render at
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fractional scales.
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A client can submit scaled content by utilizing wp_viewport. This is done by
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creating a wp_viewport object for the surface and setting the destination
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rectangle to the surface size before the scale factor is applied.
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The buffer size is calculated by multiplying the surface size by the
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intended scale.
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The wl_surface buffer scale should remain set to 1.
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If a surface has a surface-local size of 100 px by 50 px and wishes to
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submit buffers with a scale of 1.5, then a buffer of 150px by 75 px should
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be used and the wp_viewport destination rectangle should be 100 px by 50 px.
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For toplevel surfaces, the size is rounded halfway away from zero. The
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rounding algorithm for subsurface position and size is not defined.
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</description>
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<interface name="wp_fractional_scale_manager_v1" version="1">
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<description summary="fractional surface scale information">
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A global interface for requesting surfaces to use fractional scales.
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</description>
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<request name="destroy" type="destructor">
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<description summary="unbind the fractional surface scale interface">
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Informs the server that the client will not be using this protocol
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object anymore. This does not affect any other objects,
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wp_fractional_scale_v1 objects included.
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</description>
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</request>
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<enum name="error">
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<entry name="fractional_scale_exists" value="0"
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summary="the surface already has a fractional_scale object associated"/>
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</enum>
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<request name="get_fractional_scale">
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<description summary="extend surface interface for scale information">
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Create an add-on object for the the wl_surface to let the compositor
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request fractional scales. If the given wl_surface already has a
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wp_fractional_scale_v1 object associated, the fractional_scale_exists
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protocol error is raised.
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</description>
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<arg name="id" type="new_id" interface="wp_fractional_scale_v1"
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summary="the new surface scale info interface id"/>
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<arg name="surface" type="object" interface="wl_surface"
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summary="the surface"/>
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</request>
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</interface>
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<interface name="wp_fractional_scale_v1" version="1">
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<description summary="fractional scale interface to a wl_surface">
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An additional interface to a wl_surface object which allows the compositor
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to inform the client of the preferred scale.
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</description>
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<request name="destroy" type="destructor">
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<description summary="remove surface scale information for surface">
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Destroy the fractional scale object. When this object is destroyed,
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preferred_scale events will no longer be sent.
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</description>
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</request>
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<event name="preferred_scale">
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<description summary="notify of new preferred scale">
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Notification of a new preferred scale for this surface that the
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compositor suggests that the client should use.
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The sent scale is the numerator of a fraction with a denominator of 120.
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</description>
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<arg name="scale" type="uint" summary="the new preferred scale"/>
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</event>
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</interface>
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</protocol>
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