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Update wlr-export-dmabuf protocol
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parent
7901740f94
commit
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2 changed files with 52 additions and 28 deletions
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@ -24,7 +24,7 @@
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DEALINGS IN THE SOFTWARE.
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</copyright>
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<description summary="a frame ready for readout">
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<description summary="a protocol for low overhead screen content capturing">
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An interface to capture surfaces in an efficient way.
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Overall usage:
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@ -41,28 +41,27 @@
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This object represents a frame which is ready to have its resources
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fetched and used.
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The receive callback shall be called first, followed by either the
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"dma_object" callback once per object or the "dma_layer" callback,
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once per layer. The "dma_plane" callback shall only be called after
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the "dma_layer" callback corresponding to the layer the plane belongs
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to has been called. Finally, the "ready" event is called to indicate that
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all the data has been made available for readout, as well as the time
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at which presentation happened at.
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The ownership of the frame is passed to the client, who's responsible for
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destroying it via the "destroy" event once finished.
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The receive callback shall be called first, followed by the "object"
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callback once per dmabuf object or the "layer" callback, once per dmabuf
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layer. The "plane" callback shall only be called after the "layer"
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callback corresponding to the layer the plane belongs to has been called
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Finally, the "ready" event is called to indicate that all the data has
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been made available for readout, as well as the time at which presentation
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happened at. The ownership of the frame is passed to the client, who's
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responsible for destroying it via the "destroy" event once finished.
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The data the API describes has been based off of what
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VASurfaceAttribExternalBuffers contains.
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All frames are read-only and may not be written into or altered.
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</description>
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<enum name="frame_flags">
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<enum name="flags">
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<description summary="frame flags">
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Special flags that must be respected by the client.
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Transient frames indicate short lifetime frames (such as swapchain
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images from external clients). Clients are advised to copy them and do
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all processing outside of the "ready" event.
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</description>
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<entry name="transient" value="1" since="1"/>
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<entry name="transient" value="0x1" since="1"/>
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</enum>
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<event name="frame">
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@ -85,10 +84,10 @@
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<arg name="transform" type="uint"
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summary="transform needed to correct the orientation, has the same
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values as wl_output::transform"/>
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<arg name="flags" type="uint"
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<arg name="buffer_flags" type="uint"
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summary="flags which indicate properties (invert, interlacing),
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has the same values as zwp_linux_buffer_params_v1:flags"/>
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<arg name="frame_flags" type="uint" enum="frame_flags"
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<arg name="flags" type="uint" enum="flags"
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summary="indicates special frame features"/>
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<arg name="mod_high" type="uint"
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summary="drm format modifier, high"/>
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@ -99,7 +98,7 @@
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<arg name="num_layers" type="uint"
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summary="indicates how many layers the frame has (max 4)"/>
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</event>
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<event name="dma_object">
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<event name="object">
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<description summary="object receiving callback">
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Callback which serves to supply the client with the file descriptors
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containing the data for each object.
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@ -111,7 +110,7 @@
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<arg name="size" type="uint"
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summary="size in bytes for the current object"/>
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</event>
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<event name="dma_layer">
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<event name="layer">
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<description summary="layer receiving callback">
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Callback which serves to supply the client with information on what's
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contained in each file descriptor and how its laid out.
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@ -124,7 +123,7 @@
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<arg name="num_planes" type="uint"
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summary="number of planes in the current layer (max 4)"/>
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</event>
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<event name="dma_plane">
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<event name="plane">
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<description summary="plane info receiving callback">
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Callback which supplies the client with plane information for each
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layer.
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@ -158,6 +157,21 @@
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<arg name="tv_nsec" type="uint"
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summary="nanoseconds part of the timestamp"/>
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</event>
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<enum name="abort_reason">
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<description summary="abort reason">
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Indicates reason for aborting the frame.
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</description>
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<entry name="invalid_source" value="0" since="1"
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summary="invalid source, will not produce any (more) frames"/>
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<entry name="resizing" value="1" since="1"
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summary="source started being resized, this frame must be dropped,
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but source is still able to be captured"/>
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<entry name="security" value="2" since="1"
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summary="this frame must be dropped as sensitive data was present,
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however future capture may still succeed"/>
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</enum>
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<event name="abort">
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<description summary="indicates the frame is no longer valid">
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If the frame is no longer valid after the "frame" event has been called,
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@ -167,6 +181,8 @@
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This may get called if for instance the surface is in the process of
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resizing.
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</description>
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<arg name="reason" type="uint" enum="abort_reason"
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summary="indicates a reason for aborting this frame capture"/>
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</event>
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<request name="destroy" type="destructor">
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@ -208,23 +224,29 @@
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<request name="capture_client">
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<description summary="subscribe to start capturing">
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Request to start capturing from a surface with a given id.
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If an ID becomes unavailable, a NULL will be returned.
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</description>
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<arg name="frame" type="new_id"
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interface="zwlr_export_dmabuf_frame_v1"/>
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<arg name="overlay_cursor" type="int"
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summary="include custom client hardware cursor on top of the frame"/>
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<arg name="id" type="uint"
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summary="an identifier to start capturing from"/>
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<arg name="overlay_cursor" type="int"
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summary="overlay custom client hardware cursor on top of the frame"/>
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</request>
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<request name="capture_output">
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<description summary="subscribe to start capturing">
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Request to start capturing from an entire wl_output.
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If an output becomes unavailable, a NULL will be returned.
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</description>
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<arg name="frame" type="new_id"
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interface="zwlr_export_dmabuf_frame_v1"/>
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<arg name="out" type="object" interface="wl_output" allow-null="false"/>
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<arg name="overlay_cursor" type="int"
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summary="include custom client hardware cursor on top of the frame"/>
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<arg name="output" type="object" interface="wl_output"/>
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</request>
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<request name="destroy" type="destructor">
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<description summary="destroy the manager">
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All objects created by the manager will still remain valid, until their
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appropriate destroy request has been called.
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</description>
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</request>
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</interface>
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</protocol>
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@ -61,13 +61,13 @@ static struct wlr_export_dmabuf_manager_v1 *manager_from_resource(
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static void manager_handle_capture_client(struct wl_client *client,
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struct wl_resource *manager_resource, uint32_t id,
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uint32_t client_id, int32_t overlay_cursor) {
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int32_t overlay_cursor, uint32_t client_id) {
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// TODO
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}
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static void manager_handle_capture_output(struct wl_client *client,
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struct wl_resource *manager_resource, uint32_t id,
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struct wl_resource *output_resource) {
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int32_t overlay_cursor, struct wl_resource *output_resource) {
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struct wlr_export_dmabuf_manager_v1 *manager =
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manager_from_resource(manager_resource);
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struct wlr_output *output = wlr_output_from_resource(output_resource);
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struct wlr_dmabuf_buffer_attribs attribs;
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if (!wlr_output_export_dmabuf(output, &attribs)) {
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zwlr_export_dmabuf_frame_v1_send_abort(frame->resource);
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wl_list_init(&frame->output_swap_buffers.link);
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// TODO: abort reason
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zwlr_export_dmabuf_frame_v1_send_abort(frame->resource, 0);
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return;
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}
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@ -109,16 +111,16 @@ static void manager_handle_capture_output(struct wl_client *client,
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output->width, output->height, output->scale, output->transform,
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attribs.flags, frame_flags, mod_high, mod_low, attribs.n_planes, 1);
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zwlr_export_dmabuf_frame_v1_send_dma_layer(frame->resource, 0,
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zwlr_export_dmabuf_frame_v1_send_layer(frame->resource, 0,
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attribs.format, 1);
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for (int i = 0; i < attribs.n_planes; ++i) {
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// TODO: what to do if the kernel doesn't support seek on buffer
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off_t size = lseek(attribs.fd[i], 0, SEEK_END);
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zwlr_export_dmabuf_frame_v1_send_dma_object(frame->resource, i,
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zwlr_export_dmabuf_frame_v1_send_object(frame->resource, i,
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attribs.fd[i], size);
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zwlr_export_dmabuf_frame_v1_send_dma_plane(frame->resource, i, 0, i,
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zwlr_export_dmabuf_frame_v1_send_plane(frame->resource, i, 0, i,
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attribs.offset[i], attribs.stride[i]);
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}
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