forked from 12to11/12to11
Check in files for single pixel buffer support
* single-pixel-buffer-v1.xml: * single_pixel_buffer.c: New files.
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oldosfan
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69
single-pixel-buffer-v1.xml
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69
single-pixel-buffer-v1.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="single_pixel_buffer_v1">
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<copyright>
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Copyright © 2022 Simon Ser
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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="single pixel buffer factory">
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This protocol extension allows clients to create single-pixel buffers.
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Compositors supporting this protocol extension should also support the
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viewporter protocol extension. Clients may use viewporter to scale a
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single-pixel buffer to a desired size.
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Warning! The protocol described in this file is currently in the testing
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phase. Backward compatible changes may be added together with the
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corresponding interface version bump. Backward incompatible changes can
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only be done by creating a new major version of the extension.
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</description>
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<interface name="wp_single_pixel_buffer_manager_v1" version="1">
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<description summary="global factory for single-pixel buffers">
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The wp_single_pixel_buffer_manager_v1 interface is a factory for
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single-pixel buffers.
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</description>
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<request name="destroy" type="destructor">
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<description summary="destroy the manager">
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Destroy the wp_single_pixel_buffer_manager_v1 object.
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The child objects created via this interface are unaffected.
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</description>
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</request>
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<request name="create_u32_rgba_buffer">
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<description summary="create a 1×1 buffer from 32-bit RGBA values">
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Create a single-pixel buffer from four 32-bit RGBA values.
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Unless specified in another protocol extension, the RGBA values use
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pre-multiplied alpha.
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The width and height of the buffer are 1.
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</description>
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<arg name="id" type="new_id" interface="wl_buffer"/>
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<arg name="r" type="uint" summary="value of the buffer's red channel"/>
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<arg name="g" type="uint" summary="value of the buffer's green channel"/>
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<arg name="b" type="uint" summary="value of the buffer's blue channel"/>
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<arg name="a" type="uint" summary="value of the buffer's alpha channel"/>
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</request>
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</interface>
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</protocol>
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228
single_pixel_buffer.c
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228
single_pixel_buffer.c
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/* Wayland compositor running on top of an X server.
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Copyright (C) 2022 to various contributors.
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This file is part of 12to11.
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12to11 is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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12to11 is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with 12to11. If not, see <https://www.gnu.org/licenses/>. */
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#include "compositor.h"
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#include "single-pixel-buffer-v1.h"
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#include "string.h"
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typedef struct _Buffer Buffer;
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struct _Buffer
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{
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/* The ExtBuffer associated with this buffer. */
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ExtBuffer buffer;
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/* The rendering buffer associated with this buffer. */
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RenderBuffer render_buffer;
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/* The wl_resource corresponding to this buffer. */
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struct wl_resource *resource;
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/* The number of references to this buffer. */
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int refcount;
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};
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/* The global wp_single_pixel_buffer_manager_v1 resource. */
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static struct wl_global *single_pixel_buffer_global;
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static void
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DestroyBuffer (struct wl_client *client, struct wl_resource *resource)
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{
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wl_resource_destroy (resource);
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}
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static const struct wl_buffer_interface single_pixel_buffer_impl =
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{
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.destroy = DestroyBuffer,
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};
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static void
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RetainBuffer (Buffer *buffer)
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{
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buffer->refcount++;
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}
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static void
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DereferenceBuffer (Buffer *buffer)
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{
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if (--buffer->refcount)
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return;
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RenderFreeSinglePixelBuffer (buffer->render_buffer);
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ExtBufferDestroy (&buffer->buffer);
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XLFree (buffer);
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}
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static void
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ReleaseBufferFunc (ExtBuffer *buffer)
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{
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if (((Buffer *) buffer)->resource)
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wl_buffer_send_release (((Buffer *) buffer)->resource);
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}
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static void
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RetainBufferFunc (ExtBuffer *buffer)
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{
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RetainBuffer ((Buffer *) buffer);
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}
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static void
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DereferenceBufferFunc (ExtBuffer *buffer)
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{
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DereferenceBuffer ((Buffer *) buffer);
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}
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static RenderBuffer
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GetBufferFunc (ExtBuffer *buffer)
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{
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return ((Buffer *) buffer)->render_buffer;
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}
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static unsigned int
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WidthFunc (ExtBuffer *buffer)
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{
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/* Single pixel buffers are always 1x1. */
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return 1;
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}
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static unsigned int
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HeightFunc (ExtBuffer *buffer)
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{
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/* Single pixel buffers are always 1x1. */
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return 1;
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}
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static void
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PrintBuffer (Buffer *buffer)
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{
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/* Not implemented. */
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}
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static void
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PrintBufferFunc (ExtBuffer *buffer)
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{
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PrintBuffer ((Buffer *) buffer);
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}
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static void
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HandleResourceDestroy (struct wl_resource *resource)
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{
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Buffer *buffer;
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buffer = wl_resource_get_user_data (resource);
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buffer->resource = NULL;
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DereferenceBuffer (buffer);
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}
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static void
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Destroy (struct wl_client *client, struct wl_resource *resource)
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{
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wl_resource_destroy (resource);
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}
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void
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CreateU32RgbaBuffer (struct wl_client *client, struct wl_resource *resource,
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uint32_t id, uint32_t r, uint32_t g, uint32_t b,
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uint32_t a)
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{
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Buffer *buffer;
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Bool error;
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buffer = XLSafeMalloc (sizeof *buffer);
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if (!buffer)
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{
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wl_resource_post_no_memory (resource);
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return;
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}
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memset (buffer, 0, sizeof *buffer);
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buffer->resource = wl_resource_create (client, &wl_buffer_interface,
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wl_resource_get_version (resource),
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id);
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if (!buffer->resource)
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{
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out_of_memory:
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wl_resource_post_no_memory (resource);
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XLFree (buffer);
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return;
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}
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/* Now, create the render target. */
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error = False;
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buffer->render_buffer = RenderBufferFromSinglePixel (r, g, b, a,
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&error);
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if (error)
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/* We probably ran out of memory. */
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goto out_of_memory;
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buffer->refcount = 1;
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/* Initialize function pointers. */
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buffer->buffer.funcs.retain = RetainBufferFunc;
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buffer->buffer.funcs.dereference = DereferenceBufferFunc;
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buffer->buffer.funcs.get_buffer = GetBufferFunc;
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buffer->buffer.funcs.width = WidthFunc;
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buffer->buffer.funcs.height = HeightFunc;
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buffer->buffer.funcs.release = ReleaseBufferFunc;
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buffer->buffer.funcs.print_buffer = PrintBufferFunc;
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wl_resource_set_implementation (buffer->resource, &single_pixel_buffer_impl,
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buffer, HandleResourceDestroy);
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}
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static const struct wp_single_pixel_buffer_manager_v1_interface manager_impl =
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{
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.destroy = Destroy,
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.create_u32_rgba_buffer = CreateU32RgbaBuffer,
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};
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static void
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HandleBind (struct wl_client *client, void *data, uint32_t version,
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uint32_t id)
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{
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struct wl_resource *resource;
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resource = wl_resource_create (client,
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&wp_single_pixel_buffer_manager_v1_interface,
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version, id);
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if (!resource)
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{
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wl_client_post_no_memory (client);
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return;
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}
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wl_resource_set_implementation (resource, &manager_impl,
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NULL, NULL);
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}
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void
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XLInitSinglePixelBuffer (void)
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{
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single_pixel_buffer_global
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= wl_global_create (compositor.wl_display,
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&wp_single_pixel_buffer_manager_v1_interface,
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1, NULL, HandleBind);
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}
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