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| 1 <?xml version="1.0" encoding="UTF-8"?> | |
| 2 <protocol name="scaler"> | |
| 3 | |
| 4 <copyright> | |
| 5 Copyright © 2013-2014 Collabora, Ltd. | |
| 6 | |
| 7 Permission is hereby granted, free of charge, to any person obtaining a | |
| 8 copy of this software and associated documentation files (the "Software"), | |
| 9 to deal in the Software without restriction, including without limitation | |
| 10 the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| 11 and/or sell copies of the Software, and to permit persons to whom the | |
| 12 Software is furnished to do so, subject to the following conditions: | |
| 13 | |
| 14 The above copyright notice and this permission notice (including the next | |
| 15 paragraph) shall be included in all copies or substantial portions of the | |
| 16 Software. | |
| 17 | |
| 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| 21 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
| 23 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
| 24 DEALINGS IN THE SOFTWARE. | |
| 25 </copyright> | |
| 26 | |
| 27 <interface name="wl_scaler" version="2"> | |
| 28 <description summary="surface cropping and scaling"> | |
| 29 The global interface exposing surface cropping and scaling | |
| 30 capabilities is used to instantiate an interface extension for a | |
| 31 wl_surface object. This extended interface will then allow | |
| 32 cropping and scaling the surface contents, effectively | |
| 33 disconnecting the direct relationship between the buffer and the | |
| 34 surface size. | |
| 35 </description> | |
| 36 | |
| 37 <request name="destroy" type="destructor"> | |
| 38 <description summary="unbind from the cropping and scaling interface"> | |
| 39 Informs the server that the client will not be using this | |
| 40 protocol object anymore. This does not affect any other objects, | |
| 41 wl_viewport objects included. | |
| 42 </description> | |
| 43 </request> | |
| 44 | |
| 45 <enum name="error"> | |
| 46 <entry name="viewport_exists" value="0" | |
| 47 summary="the surface already has a viewport object associated"/> | |
| 48 </enum> | |
| 49 | |
| 50 <request name="get_viewport"> | |
| 51 <description summary="extend surface interface for crop and scale"> | |
| 52 Instantiate an interface extension for the given wl_surface to | |
| 53 crop and scale its content. If the given wl_surface already has | |
| 54 a wl_viewport object associated, the viewport_exists | |
| 55 protocol error is raised. | |
| 56 </description> | |
| 57 | |
| 58 <arg name="id" type="new_id" interface="wl_viewport" | |
| 59 summary="the new viewport interface id"/> | |
| 60 <arg name="surface" type="object" interface="wl_surface" | |
| 61 summary="the surface"/> | |
| 62 </request> | |
| 63 </interface> | |
| 64 | |
| 65 <interface name="wl_viewport" version="2"> | |
| 66 <description summary="crop and scale interface to a wl_surface"> | |
| 67 An additional interface to a wl_surface object, which allows the | |
| 68 client to specify the cropping and scaling of the surface | |
| 69 contents. | |
| 70 | |
| 71 This interface allows to define the source rectangle (src_x, | |
| 72 src_y, src_width, src_height) from where to take the wl_buffer | |
| 73 contents, and scale that to destination size (dst_width, | |
| 74 dst_height). This state is double-buffered, and is applied on the | |
| 75 next wl_surface.commit. | |
| 76 | |
| 77 The two parts of crop and scale state are independent: the source | |
| 78 rectangle, and the destination size. Initially both are unset, that | |
| 79 is, no scaling is applied. The whole of the current wl_buffer is | |
| 80 used as the source, and the surface size is as defined in | |
| 81 wl_surface.attach. | |
| 82 | |
| 83 If the destination size is set, it causes the surface size to become | |
| 84 dst_width, dst_height. The source (rectangle) is scaled to exactly | |
| 85 this size. This overrides whatever the attached wl_buffer size is, | |
| 86 unless the wl_buffer is NULL. If the wl_buffer is NULL, the surface | |
| 87 has no content and therefore no size. Otherwise, the size is always | |
| 88 at least 1x1 in surface coordinates. | |
| 89 | |
| 90 If the source rectangle is set, it defines what area of the | |
| 91 wl_buffer is taken as the source. If the source rectangle is set and | |
| 92 the destination size is not set, the surface size becomes the source | |
| 93 rectangle size rounded up to the nearest integer. If the source size | |
| 94 is already exactly integers, this results in cropping without scaling. | |
| 95 | |
| 96 The coordinate transformations from buffer pixel coordinates up to | |
| 97 the surface-local coordinates happen in the following order: | |
| 98 1. buffer_transform (wl_surface.set_buffer_transform) | |
| 99 2. buffer_scale (wl_surface.set_buffer_scale) | |
| 100 3. crop and scale (wl_viewport.set*) | |
| 101 This means, that the source rectangle coordinates of crop and scale | |
| 102 are given in the coordinates after the buffer transform and scale, | |
| 103 i.e. in the coordinates that would be the surface-local coordinates | |
| 104 if the crop and scale was not applied. | |
| 105 | |
| 106 If the source rectangle is partially or completely outside of the | |
| 107 wl_buffer, then the surface contents are undefined (not void), and | |
| 108 the surface size is still dst_width, dst_height. | |
| 109 | |
| 110 The x, y arguments of wl_surface.attach are applied as normal to | |
| 111 the surface. They indicate how many pixels to remove from the | |
| 112 surface size from the left and the top. In other words, they are | |
| 113 still in the surface-local coordinate system, just like dst_width | |
| 114 and dst_height are. | |
| 115 | |
| 116 If the wl_surface associated with the wl_viewport is destroyed, | |
| 117 the wl_viewport object becomes inert. | |
| 118 | |
| 119 If the wl_viewport object is destroyed, the crop and scale | |
| 120 state is removed from the wl_surface. The change will be applied | |
| 121 on the next wl_surface.commit. | |
| 122 </description> | |
| 123 | |
| 124 <request name="destroy" type="destructor"> | |
| 125 <description summary="remove scaling and cropping from the surface"> | |
| 126 The associated wl_surface's crop and scale state is removed. | |
| 127 The change is applied on the next wl_surface.commit. | |
| 128 </description> | |
| 129 </request> | |
| 130 | |
| 131 <enum name="error"> | |
| 132 <entry name="bad_value" value="0" | |
| 133 summary="negative or zero values in width or height"/> | |
| 134 </enum> | |
| 135 | |
| 136 <request name="set"> | |
| 137 <description summary="set the crop and scale state"> | |
| 138 Set both source rectangle and destination size of the associated | |
| 139 wl_surface. See wl_viewport for the description, and relation to | |
| 140 the wl_buffer size. | |
| 141 | |
| 142 The bad_value protocol error is raised if src_width or | |
| 143 src_height is negative, or if dst_width or dst_height is not | |
| 144 positive. | |
| 145 | |
| 146 The crop and scale state is double-buffered state, and will be | |
| 147 applied on the next wl_surface.commit. | |
| 148 | |
| 149 Arguments dst_x and dst_y do not exist here, use the x and y | |
| 150 arguments to wl_surface.attach. The x, y, dst_width, and dst_height | |
| 151 define the surface-local coordinate system irrespective of the | |
| 152 attached wl_buffer size. | |
| 153 </description> | |
| 154 | |
| 155 <arg name="src_x" type="fixed" summary="source rectangle x"/> | |
| 156 <arg name="src_y" type="fixed" summary="source rectangle y"/> | |
| 157 <arg name="src_width" type="fixed" summary="source rectangle width"/> | |
| 158 <arg name="src_height" type="fixed" summary="source rectangle height"/> | |
| 159 <arg name="dst_width" type="int" summary="surface width"/> | |
| 160 <arg name="dst_height" type="int" summary="surface height"/> | |
| 161 </request> | |
| 162 | |
| 163 <request name="set_source" since="2"> | |
| 164 <description summary="set the source rectangle for cropping"> | |
| 165 Set the source rectangle of the associated wl_surface. See | |
| 166 wl_viewport for the description, and relation to the wl_buffer | |
| 167 size. | |
| 168 | |
| 169 If width is -1.0 and height is -1.0, the source rectangle is unset | |
| 170 instead. Any other pair of values for width and height that | |
| 171 contains zero or negative values raises the bad_value protocol | |
| 172 error. | |
| 173 | |
| 174 The crop and scale state is double-buffered state, and will be | |
| 175 applied on the next wl_surface.commit. | |
| 176 </description> | |
| 177 | |
| 178 <arg name="x" type="fixed" summary="source rectangle x"/> | |
| 179 <arg name="y" type="fixed" summary="source rectangle y"/> | |
| 180 <arg name="width" type="fixed" summary="source rectangle width"/> | |
| 181 <arg name="height" type="fixed" summary="source rectangle height"/> | |
| 182 </request> | |
| 183 | |
| 184 <request name="set_destination" since="2"> | |
| 185 <description summary="set the surface size for scaling"> | |
| 186 Set the destination size of the associated wl_surface. See | |
| 187 wl_viewport for the description, and relation to the wl_buffer | |
| 188 size. | |
| 189 | |
| 190 If width is -1 and height is -1, the destination size is unset | |
| 191 instead. Any other pair of values for width and height that | |
| 192 contains zero or negative values raises the bad_value protocol | |
| 193 error. | |
| 194 | |
| 195 The crop and scale state is double-buffered state, and will be | |
| 196 applied on the next wl_surface.commit. | |
| 197 | |
| 198 Arguments x and y do not exist here, use the x and y arguments to | |
| 199 wl_surface.attach. The x, y, width, and height define the | |
| 200 surface-local coordinate system irrespective of the attached | |
| 201 wl_buffer size. | |
| 202 </description> | |
| 203 | |
| 204 <arg name="width" type="int" summary="surface width"/> | |
| 205 <arg name="height" type="int" summary="surface height"/> | |
| 206 </request> | |
| 207 </interface> | |
| 208 </protocol> | |
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Chromium Code Reviews
Issue 1805313002:
Revert of third_party: Add missing scaler.xml file. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master