This adds basic support for fractional-scale-v1. Note that this introduces a potential discrepancy between window and monitor content scales.master
Camilla Löwy
ago%!(EXTRA string=1 year)
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2b3f919b60
8 changed files with 216 additions and 7 deletions
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<?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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