[PATCH wayland-protocols v3 1/5] stable: add viewporter draft
Pekka Paalanen
ppaalanen at gmail.com
Tue Apr 26 12:50:53 UTC 2016
From: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
This XML file has been copied verbatim from Weston 1.10.0 release,
protocol/scaler.xml.
The interfaces still need renaming according to wayland-protocols
policy. Also a redundant request needs to be removed. These will be done
in a follow-up patch to clearly show the changes.
Signed-off-by: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
Reviewed-by: Yong Bakos <ybakos at humanoriented.com>
Reviewed-by: Daniel Stone <daniels at collabora.com>
---
stable/viewporter/README | 7 ++
stable/viewporter/viewporter.xml | 208 +++++++++++++++++++++++++++++++++++++++
2 files changed, 215 insertions(+)
create mode 100644 stable/viewporter/README
create mode 100644 stable/viewporter/viewporter.xml
diff --git a/stable/viewporter/README b/stable/viewporter/README
new file mode 100644
index 0000000..e09057b
--- /dev/null
+++ b/stable/viewporter/README
@@ -0,0 +1,7 @@
+Viewporter: cropping and scaling extension for surface contents
+
+Previously known as wl_scaler.
+
+Maintainers:
+Pekka Paalanen <pekka.paalanen at collabora.co.uk>
+
diff --git a/stable/viewporter/viewporter.xml b/stable/viewporter/viewporter.xml
new file mode 100644
index 0000000..0e482a6
--- /dev/null
+++ b/stable/viewporter/viewporter.xml
@@ -0,0 +1,208 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="scaler">
+
+ <copyright>
+ Copyright © 2013-2014 Collabora, Ltd.
+
+ 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>
+
+ <interface name="wl_scaler" version="2">
+ <description summary="surface cropping and scaling">
+ The global interface exposing surface cropping and scaling
+ capabilities is used to instantiate an interface extension for a
+ wl_surface object. This extended interface will then allow
+ cropping and scaling the surface contents, effectively
+ disconnecting the direct relationship between the buffer and the
+ surface size.
+ </description>
+
+ <request name="destroy" type="destructor">
+ <description summary="unbind from the cropping and scaling interface">
+ Informs the server that the client will not be using this
+ protocol object anymore. This does not affect any other objects,
+ wl_viewport objects included.
+ </description>
+ </request>
+
+ <enum name="error">
+ <entry name="viewport_exists" value="0"
+ summary="the surface already has a viewport object associated"/>
+ </enum>
+
+ <request name="get_viewport">
+ <description summary="extend surface interface for crop and scale">
+ Instantiate an interface extension for the given wl_surface to
+ crop and scale its content. If the given wl_surface already has
+ a wl_viewport object associated, the viewport_exists
+ protocol error is raised.
+ </description>
+
+ <arg name="id" type="new_id" interface="wl_viewport"
+ summary="the new viewport interface id"/>
+ <arg name="surface" type="object" interface="wl_surface"
+ summary="the surface"/>
+ </request>
+ </interface>
+
+ <interface name="wl_viewport" version="2">
+ <description summary="crop and scale interface to a wl_surface">
+ An additional interface to a wl_surface object, which allows the
+ client to specify the cropping and scaling of the surface
+ contents.
+
+ This interface allows to define the source rectangle (src_x,
+ src_y, src_width, src_height) from where to take the wl_buffer
+ contents, and scale that to destination size (dst_width,
+ dst_height). This state is double-buffered, and is applied on the
+ next wl_surface.commit.
+
+ The two parts of crop and scale state are independent: the source
+ rectangle, and the destination size. Initially both are unset, that
+ is, no scaling is applied. The whole of the current wl_buffer is
+ used as the source, and the surface size is as defined in
+ wl_surface.attach.
+
+ If the destination size is set, it causes the surface size to become
+ dst_width, dst_height. The source (rectangle) is scaled to exactly
+ this size. This overrides whatever the attached wl_buffer size is,
+ unless the wl_buffer is NULL. If the wl_buffer is NULL, the surface
+ has no content and therefore no size. Otherwise, the size is always
+ at least 1x1 in surface coordinates.
+
+ If the source rectangle is set, it defines what area of the
+ wl_buffer is taken as the source. If the source rectangle is set and
+ the destination size is not set, the surface size becomes the source
+ rectangle size rounded up to the nearest integer. If the source size
+ is already exactly integers, this results in cropping without scaling.
+
+ The coordinate transformations from buffer pixel coordinates up to
+ the surface-local coordinates happen in the following order:
+ 1. buffer_transform (wl_surface.set_buffer_transform)
+ 2. buffer_scale (wl_surface.set_buffer_scale)
+ 3. crop and scale (wl_viewport.set*)
+ This means, that the source rectangle coordinates of crop and scale
+ are given in the coordinates after the buffer transform and scale,
+ i.e. in the coordinates that would be the surface-local coordinates
+ if the crop and scale was not applied.
+
+ If the source rectangle is partially or completely outside of the
+ wl_buffer, then the surface contents are undefined (not void), and
+ the surface size is still dst_width, dst_height.
+
+ The x, y arguments of wl_surface.attach are applied as normal to
+ the surface. They indicate how many pixels to remove from the
+ surface size from the left and the top. In other words, they are
+ still in the surface-local coordinate system, just like dst_width
+ and dst_height are.
+
+ If the wl_surface associated with the wl_viewport is destroyed,
+ the wl_viewport object becomes inert.
+
+ If the wl_viewport object is destroyed, the crop and scale
+ state is removed from the wl_surface. The change will be applied
+ on the next wl_surface.commit.
+ </description>
+
+ <request name="destroy" type="destructor">
+ <description summary="remove scaling and cropping from the surface">
+ The associated wl_surface's crop and scale state is removed.
+ The change is applied on the next wl_surface.commit.
+ </description>
+ </request>
+
+ <enum name="error">
+ <entry name="bad_value" value="0"
+ summary="negative or zero values in width or height"/>
+ </enum>
+
+ <request name="set">
+ <description summary="set the crop and scale state">
+ Set both source rectangle and destination size of the associated
+ wl_surface. See wl_viewport for the description, and relation to
+ the wl_buffer size.
+
+ The bad_value protocol error is raised if src_width or
+ src_height is negative, or if dst_width or dst_height is not
+ positive.
+
+ The crop and scale state is double-buffered state, and will be
+ applied on the next wl_surface.commit.
+
+ Arguments dst_x and dst_y do not exist here, use the x and y
+ arguments to wl_surface.attach. The x, y, dst_width, and dst_height
+ define the surface-local coordinate system irrespective of the
+ attached wl_buffer size.
+ </description>
+
+ <arg name="src_x" type="fixed" summary="source rectangle x"/>
+ <arg name="src_y" type="fixed" summary="source rectangle y"/>
+ <arg name="src_width" type="fixed" summary="source rectangle width"/>
+ <arg name="src_height" type="fixed" summary="source rectangle height"/>
+ <arg name="dst_width" type="int" summary="surface width"/>
+ <arg name="dst_height" type="int" summary="surface height"/>
+ </request>
+
+ <request name="set_source" since="2">
+ <description summary="set the source rectangle for cropping">
+ Set the source rectangle of the associated wl_surface. See
+ wl_viewport for the description, and relation to the wl_buffer
+ size.
+
+ If width is -1.0 and height is -1.0, the source rectangle is unset
+ instead. Any other pair of values for width and height that
+ contains zero or negative values raises the bad_value protocol
+ error.
+
+ The crop and scale state is double-buffered state, and will be
+ applied on the next wl_surface.commit.
+ </description>
+
+ <arg name="x" type="fixed" summary="source rectangle x"/>
+ <arg name="y" type="fixed" summary="source rectangle y"/>
+ <arg name="width" type="fixed" summary="source rectangle width"/>
+ <arg name="height" type="fixed" summary="source rectangle height"/>
+ </request>
+
+ <request name="set_destination" since="2">
+ <description summary="set the surface size for scaling">
+ Set the destination size of the associated wl_surface. See
+ wl_viewport for the description, and relation to the wl_buffer
+ size.
+
+ If width is -1 and height is -1, the destination size is unset
+ instead. Any other pair of values for width and height that
+ contains zero or negative values raises the bad_value protocol
+ error.
+
+ The crop and scale state is double-buffered state, and will be
+ applied on the next wl_surface.commit.
+
+ Arguments x and y do not exist here, use the x and y arguments to
+ wl_surface.attach. The x, y, width, and height define the
+ surface-local coordinate system irrespective of the attached
+ wl_buffer size.
+ </description>
+
+ <arg name="width" type="int" summary="surface width"/>
+ <arg name="height" type="int" summary="surface height"/>
+ </request>
+ </interface>
+</protocol>
--
2.7.3
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