From 9bd70a3a87ce97790d49d46c3b1d0bbdc42a0a37 Mon Sep 17 00:00:00 2001 From: Kenny Levinsen Date: Tue, 5 Apr 2022 15:35:52 +0200 Subject: wp-fractional-scale-v1: new protocol This protocols allows for communicating preferred fractional scales to surfaces, which in combination with wp_viewport can be used to render surfaces at fractional scales when applicable. Signed-off-by: Kenny Levinsen --- meson.build | 1 + staging/fractional-scale/README | 4 + staging/fractional-scale/fractional-scale-v1.xml | 102 +++++++++++++++++++++++ 3 files changed, 107 insertions(+) create mode 100644 staging/fractional-scale/README create mode 100644 staging/fractional-scale/fractional-scale-v1.xml diff --git a/meson.build b/meson.build index 855ead3..fe61cd6 100644 --- a/meson.build +++ b/meson.build @@ -40,6 +40,7 @@ staging_protocols = { 'drm-lease': ['v1'], 'ext-idle-notify': ['v1'], 'ext-session-lock': ['v1'], + 'fractional-scale': ['v1'], 'single-pixel-buffer': ['v1'], 'tearing-control': ['v1'], 'xdg-activation': ['v1'], diff --git a/staging/fractional-scale/README b/staging/fractional-scale/README new file mode 100644 index 0000000..6cb0475 --- /dev/null +++ b/staging/fractional-scale/README @@ -0,0 +1,4 @@ +wp fractional scale protocol + +Maintainers: +Kenny Levinsen diff --git a/staging/fractional-scale/fractional-scale-v1.xml b/staging/fractional-scale/fractional-scale-v1.xml new file mode 100644 index 0000000..350bfc0 --- /dev/null +++ b/staging/fractional-scale/fractional-scale-v1.xml @@ -0,0 +1,102 @@ + + + + Copyright © 2022 Kenny Levinsen + + Permission is hereby granted, free of charge, to any person obtaining a + copy of this software and associated documentation files (the "Software"), + to deal in the Software without restriction, including without limitation + the rights to use, copy, modify, merge, publish, distribute, sublicense, + and/or sell copies of the Software, and to permit persons to whom the + Software is furnished to do so, subject to the following conditions: + + The above copyright notice and this permission notice (including the next + paragraph) shall be included in all copies or substantial portions of the + Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + DEALINGS IN THE SOFTWARE. + + + + This protocol allows a compositor to suggest for surfaces to render at + fractional scales. + + A client can submit scaled content by utilizing wp_viewport. This is done by + creating a wp_viewport object for the surface and setting the destination + rectangle to the surface size before the scale factor is applied. + + The buffer size is calculated by multiplying the surface size by the + intended scale. + + The wl_surface buffer scale should remain set to 1. + + If a surface has a surface-local size of 100 px by 50 px and wishes to + submit buffers with a scale of 1.5, then a buffer of 150px by 75 px should + be used and the wp_viewport destination rectangle should be 100 px by 50 px. + + For toplevel surfaces, the size is rounded halfway away from zero. The + rounding algorithm for subsurface position and size is not defined. + + + + + A global interface for requesting surfaces to use fractional scales. + + + + + Informs the server that the client will not be using this protocol + object anymore. This does not affect any other objects, + wp_fractional_scale_v1 objects included. + + + + + + + + + + Create an add-on object for the the wl_surface to let the compositor + request fractional scales. If the given wl_surface already has a + wp_fractional_scale_v1 object associated, the fractional_scale_exists + protocol error is raised. + + + + + + + + + An additional interface to a wl_surface object which allows the compositor + to inform the client of the preferred scale. + + + + + Destroy the fractional scale object. When this object is destroyed, + preferred_scale events will no longer be sent. + + + + + + Notification of a new preferred scale for this surface that the + compositor suggests that the client should use. + + The sent scale is the numerator of a fraction with a denominator of 120. + + + + + -- cgit v1.2.1