187 lines
8.3 KiB
XML
187 lines
8.3 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="viewporter">
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<copyright>
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Copyright © 2013-2016 Collabora, Ltd.
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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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<interface name="wp_viewporter" version="1">
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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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wp_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 wp_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="wp_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="wp_viewport" version="1">
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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 works with two concepts: the source rectangle (src_x,
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src_y, src_width, src_height), and the destination size (dst_width,
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dst_height). The contents of the source rectangle are scaled to the
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destination size, and content outside the source rectangle is ignored.
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This state is double-buffered, and is applied on the next
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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. Otherwise, the size is always
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at least 1x1 in surface local coordinates.
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If the source rectangle is set, it defines what area of the wl_buffer is
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taken as the source. If the source rectangle is set and the destination
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size is not set, then src_width and src_height must be integers, and the
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surface size becomes the source rectangle size. This results in cropping
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without scaling. If src_width or src_height are not integers and
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destination size is not set, the bad_size protocol error is raised when
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the surface state is applied.
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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 (wp_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 src_x or src_y are negative, the bad_value protocol error is raised.
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Otherwise, if the source rectangle is partially or completely outside of
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the non-NULL wl_buffer, then the out_of_buffer protocol error is raised
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when the surface state is applied. A NULL wl_buffer does not raise the
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out_of_buffer error.
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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 wp_viewport is destroyed,
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all wp_viewport requests except 'destroy' raise the protocol error
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no_surface.
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If the wp_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 or zero values in width or height"/>
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<entry name="bad_size" value="1"
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summary="destination size is not integer"/>
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<entry name="out_of_buffer" value="2"
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summary="source rectangle extends outside of the content area"/>
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<entry name="no_surface" value="3"
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summary="the wl_surface was destroyed"/>
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</enum>
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<request name="set_source">
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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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wp_viewport for the description, and relation to the wl_buffer
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size.
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If all of x, y, width and height are -1.0, the source rectangle is
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unset instead. Any other set of values where width or height are zero
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or negative, or x or y are negative, raise the bad_value protocol
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error.
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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">
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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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wp_viewport for the description, and relation to the wl_buffer
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size.
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If width is -1 and height is -1, the destination size is unset
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instead. Any other pair of values for width and height that
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contains zero or negative values raises the bad_value protocol
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error.
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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="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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