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Check in files for single pixel buffer support

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* single-pixel-buffer-v1.xml:
* single_pixel_buffer.c: New files.
This commit is contained in:
oldosfan 2022-10-06 10:42:20 +00:00
parent c190ead122
commit a5c7565eb0
2 changed files with 297 additions and 0 deletions
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single-pixel-buffer-v1.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="single_pixel_buffer_v1">
<copyright>
Copyright © 2022 Simon Ser
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.
</copyright>
<description summary="single pixel buffer factory">
This protocol extension allows clients to create single-pixel buffers.
Compositors supporting this protocol extension should also support the
viewporter protocol extension. Clients may use viewporter to scale a
single-pixel buffer to a desired size.
Warning! The protocol described in this file is currently in the testing
phase. Backward compatible changes may be added together with the
corresponding interface version bump. Backward incompatible changes can
only be done by creating a new major version of the extension.
</description>
<interface name="wp_single_pixel_buffer_manager_v1" version="1">
<description summary="global factory for single-pixel buffers">
The wp_single_pixel_buffer_manager_v1 interface is a factory for
single-pixel buffers.
</description>
<request name="destroy" type="destructor">
<description summary="destroy the manager">
Destroy the wp_single_pixel_buffer_manager_v1 object.
The child objects created via this interface are unaffected.
</description>
</request>
<request name="create_u32_rgba_buffer">
<description summary="create a 1×1 buffer from 32-bit RGBA values">
Create a single-pixel buffer from four 32-bit RGBA values.
Unless specified in another protocol extension, the RGBA values use
pre-multiplied alpha.
The width and height of the buffer are 1.
</description>
<arg name="id" type="new_id" interface="wl_buffer"/>
<arg name="r" type="uint" summary="value of the buffer's red channel"/>
<arg name="g" type="uint" summary="value of the buffer's green channel"/>
<arg name="b" type="uint" summary="value of the buffer's blue channel"/>
<arg name="a" type="uint" summary="value of the buffer's alpha channel"/>
</request>
</interface>
</protocol>

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/* Wayland compositor running on top of an X server.
Copyright (C) 2022 to various contributors.
This file is part of 12to11.
12to11 is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
12to11 is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with 12to11. If not, see <https://www.gnu.org/licenses/>. */
#include "compositor.h"
#include "single-pixel-buffer-v1.h"
#include "string.h"
typedef struct _Buffer Buffer;
struct _Buffer
{
/* The ExtBuffer associated with this buffer. */
ExtBuffer buffer;
/* The rendering buffer associated with this buffer. */
RenderBuffer render_buffer;
/* The wl_resource corresponding to this buffer. */
struct wl_resource *resource;
/* The number of references to this buffer. */
int refcount;
};
/* The global wp_single_pixel_buffer_manager_v1 resource. */
static struct wl_global *single_pixel_buffer_global;
static void
DestroyBuffer (struct wl_client *client, struct wl_resource *resource)
{
wl_resource_destroy (resource);
}
static const struct wl_buffer_interface single_pixel_buffer_impl =
{
.destroy = DestroyBuffer,
};
static void
RetainBuffer (Buffer *buffer)
{
buffer->refcount++;
}
static void
DereferenceBuffer (Buffer *buffer)
{
if (--buffer->refcount)
return;
RenderFreeSinglePixelBuffer (buffer->render_buffer);
ExtBufferDestroy (&buffer->buffer);
XLFree (buffer);
}
static void
ReleaseBufferFunc (ExtBuffer *buffer)
{
if (((Buffer *) buffer)->resource)
wl_buffer_send_release (((Buffer *) buffer)->resource);
}
static void
RetainBufferFunc (ExtBuffer *buffer)
{
RetainBuffer ((Buffer *) buffer);
}
static void
DereferenceBufferFunc (ExtBuffer *buffer)
{
DereferenceBuffer ((Buffer *) buffer);
}
static RenderBuffer
GetBufferFunc (ExtBuffer *buffer)
{
return ((Buffer *) buffer)->render_buffer;
}
static unsigned int
WidthFunc (ExtBuffer *buffer)
{
/* Single pixel buffers are always 1x1. */
return 1;
}
static unsigned int
HeightFunc (ExtBuffer *buffer)
{
/* Single pixel buffers are always 1x1. */
return 1;
}
static void
PrintBuffer (Buffer *buffer)
{
/* Not implemented. */
}
static void
PrintBufferFunc (ExtBuffer *buffer)
{
PrintBuffer ((Buffer *) buffer);
}
static void
HandleResourceDestroy (struct wl_resource *resource)
{
Buffer *buffer;
buffer = wl_resource_get_user_data (resource);
buffer->resource = NULL;
DereferenceBuffer (buffer);
}
static void
Destroy (struct wl_client *client, struct wl_resource *resource)
{
wl_resource_destroy (resource);
}
void
CreateU32RgbaBuffer (struct wl_client *client, struct wl_resource *resource,
uint32_t id, uint32_t r, uint32_t g, uint32_t b,
uint32_t a)
{
Buffer *buffer;
Bool error;
buffer = XLSafeMalloc (sizeof *buffer);
if (!buffer)
{
wl_resource_post_no_memory (resource);
return;
}
memset (buffer, 0, sizeof *buffer);
buffer->resource = wl_resource_create (client, &wl_buffer_interface,
wl_resource_get_version (resource),
id);
if (!buffer->resource)
{
out_of_memory:
wl_resource_post_no_memory (resource);
XLFree (buffer);
return;
}
/* Now, create the render target. */
error = False;
buffer->render_buffer = RenderBufferFromSinglePixel (r, g, b, a,
&error);
if (error)
/* We probably ran out of memory. */
goto out_of_memory;
buffer->refcount = 1;
/* Initialize function pointers. */
buffer->buffer.funcs.retain = RetainBufferFunc;
buffer->buffer.funcs.dereference = DereferenceBufferFunc;
buffer->buffer.funcs.get_buffer = GetBufferFunc;
buffer->buffer.funcs.width = WidthFunc;
buffer->buffer.funcs.height = HeightFunc;
buffer->buffer.funcs.release = ReleaseBufferFunc;
buffer->buffer.funcs.print_buffer = PrintBufferFunc;
wl_resource_set_implementation (buffer->resource, &single_pixel_buffer_impl,
buffer, HandleResourceDestroy);
}
static const struct wp_single_pixel_buffer_manager_v1_interface manager_impl =
{
.destroy = Destroy,
.create_u32_rgba_buffer = CreateU32RgbaBuffer,
};
static void
HandleBind (struct wl_client *client, void *data, uint32_t version,
uint32_t id)
{
struct wl_resource *resource;
resource = wl_resource_create (client,
&wp_single_pixel_buffer_manager_v1_interface,
version, id);
if (!resource)
{
wl_client_post_no_memory (client);
return;
}
wl_resource_set_implementation (resource, &manager_impl,
NULL, NULL);
}
void
XLInitSinglePixelBuffer (void)
{
single_pixel_buffer_global
= wl_global_create (compositor.wl_display,
&wp_single_pixel_buffer_manager_v1_interface,
1, NULL, HandleBind);
}