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https://gitlab.freedesktop.org/wayland/weston.git
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0b4c535d73
Bump wl_scaler and wl_viewport versions to 2. Add new requests wl_viewport.set_source and .set_destination, which are meant to replace wl_viewport.set request. Now a client can set and unset just one of source rectangle and destination size. Define the semantics when one of these is unset. Implement these semantics changes in compositor and pixman renderer. GL-renderer does not need changes. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
205 lines
8.7 KiB
XML
205 lines
8.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="scaler">
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<copyright>
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Copyright © 2013-2014 Collabora, Ltd.
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that copyright notice and this permission
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notice appear in supporting documentation, and that the name of
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the copyright holders not be used in advertising or publicity
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pertaining to distribution of the software without specific,
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written prior permission. The copyright holders make no
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representations about the suitability of this software for any
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purpose. It is provided "as is" without express or implied
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warranty.
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THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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</copyright>
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<interface name="wl_scaler" version="2">
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<description summary="surface cropping and scaling">
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The global interface exposing surface cropping and scaling
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capabilities is used to instantiate an interface extension for a
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wl_surface object. This extended interface will then allow
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cropping and scaling the surface contents, effectively
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disconnecting the direct relationship between the buffer and the
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surface size.
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</description>
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<request name="destroy" type="destructor">
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<description summary="unbind from the cropping and scaling interface">
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Informs the server that the client will not be using this
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protocol object anymore. This does not affect any other objects,
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wl_viewport 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="viewport_exists" value="0"
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summary="the surface already has a viewport object associated"/>
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</enum>
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<request name="get_viewport">
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<description summary="extend surface interface for crop and scale">
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Instantiate an interface extension for the given wl_surface to
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crop and scale its content. If the given wl_surface already has
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a wl_viewport object associated, the viewport_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="wl_viewport"
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summary="the new viewport 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="wl_viewport" version="2">
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<description summary="crop and scale interface to a wl_surface">
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An additional interface to a wl_surface object, which allows the
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client to specify the cropping and scaling of the surface
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contents.
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This interface allows to define the source rectangle (src_x,
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src_y, src_width, src_height) from where to take the wl_buffer
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contents, and scale that to destination size (dst_width,
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dst_height). This state is double-buffered, and is applied on the
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next wl_surface.commit.
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The two parts of crop and scale state are independent: the source
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rectangle, and the destination size. Initially both are unset, that
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is, no scaling is applied. The whole of the current wl_buffer is
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used as the source, and the surface size is as defined in
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wl_surface.attach.
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If the destination size is set, it causes the surface size to become
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dst_width, dst_height. The source (rectangle) is scaled to exactly
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this size. This overrides whatever the attached wl_buffer size is,
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unless the wl_buffer is NULL. If the wl_buffer is NULL, the surface
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has no content and therefore no size.
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If the source rectangle is set, it defines what area of the
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wl_buffer is taken as the source. If the source rectangle is set and
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the destination size is not set, the surface size becomes the source
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rectangle size rounded up to the nearest integer. If the source size
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is already exactly integers, this results in cropping without scaling.
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The coordinate transformations from buffer pixel coordinates up to
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the surface-local coordinates happen in the following order:
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1. buffer_transform (wl_surface.set_buffer_transform)
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2. buffer_scale (wl_surface.set_buffer_scale)
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3. crop and scale (wl_viewport.set*)
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This means, that the source rectangle coordinates of crop and scale
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are given in the coordinates after the buffer transform and scale,
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i.e. in the coordinates that would be the surface-local coordinates
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if the crop and scale was not applied.
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If the source rectangle is partially or completely outside of the
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wl_buffer, then the surface contents are undefined (not void), and
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the surface size is still dst_width, dst_height.
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The x, y arguments of wl_surface.attach are applied as normal to
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the surface. They indicate how many pixels to remove from the
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surface size from the left and the top. In other words, they are
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still in the surface-local coordinate system, just like dst_width
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and dst_height are.
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If the wl_surface associated with the wl_viewport is destroyed,
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the wl_viewport object becomes inert.
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If the wl_viewport object is destroyed, the crop and scale
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state is removed from the wl_surface. The change will be applied
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on the next wl_surface.commit.
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</description>
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<request name="destroy" type="destructor">
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<description summary="remove scaling and cropping from the surface">
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The associated wl_surface's crop and scale state is removed.
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The change is applied on the next wl_surface.commit.
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</description>
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</request>
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<enum name="error">
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<entry name="bad_value" value="0"
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summary="negative values in width or height"/>
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</enum>
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<request name="set">
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<description summary="set the crop and scale state">
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Set both source rectangle and destination size of the associated
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wl_surface. See wl_viewport for the description, and relation to
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the wl_buffer size.
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The bad_value protocol error is raised if src_width or
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src_height is negative, or if dst_width or dst_height is not
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positive.
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The crop and scale state is double-buffered state, and will be
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applied on the next wl_surface.commit.
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Arguments dst_x and dst_y do not exist here, use the x and y
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arguments to wl_surface.attach. The x, y, dst_width, and dst_height
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define the surface-local coordinate system irrespective of the
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attached wl_buffer size.
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</description>
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<arg name="src_x" type="fixed" summary="source rectangle x"/>
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<arg name="src_y" type="fixed" summary="source rectangle y"/>
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<arg name="src_width" type="fixed" summary="source rectangle width"/>
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<arg name="src_height" type="fixed" summary="source rectangle height"/>
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<arg name="dst_width" type="int" summary="surface width"/>
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<arg name="dst_height" type="int" summary="surface height"/>
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</request>
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<request name="set_source" since="2">
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<description summary="set the source rectangle for cropping">
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Set the source rectangle of the associated wl_surface. See
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wl_viewport for the description, and relation to the wl_buffer
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size.
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If width and/or height are negative, the source rectangle is unset
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instead.
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The crop and scale state is double-buffered state, and will be
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applied on the next wl_surface.commit.
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</description>
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<arg name="x" type="fixed" summary="source rectangle x"/>
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<arg name="y" type="fixed" summary="source rectangle y"/>
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<arg name="width" type="fixed" summary="source rectangle width"/>
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<arg name="height" type="fixed" summary="source rectangle height"/>
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</request>
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<request name="set_destination" since="2">
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<description summary="set the surface size for scaling">
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Set the destination size of the associated wl_surface. See
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wl_viewport for the description, and relation to the wl_buffer
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size.
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If width and/or height are negative or zero, the destination size
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is unset instead.
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The crop and scale state is double-buffered state, and will be
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applied on the next wl_surface.commit.
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Arguments x and y do not exist here, use the x and y arguments to
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wl_surface.attach. The x, y, width, and height define the
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surface-local coordinate system irrespective of the attached
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wl_buffer size.
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</description>
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<arg name="width" type="int" summary="surface width"/>
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<arg name="height" type="int" summary="surface height"/>
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</request>
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</interface>
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</protocol>
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