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Support direct scanout with src crop and dst boxes

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Enable scene-tree direct scanout of a single buffer with various options
for scaling and source crop. This is intended to support direct scanout
for fullscreen video with/without scaling, letterboxing/pillarboxing
(e.g. 4:3 content on a 16:9 display), and source crop (e.g. when
1920x1088 planes are used for 1920x1080 video).

This works by explicitly specifying the source crop and destination box
for the primary buffer in the output state.  DRM atomic and libliftoff
backends will turn this into a crop and scale of the plane (assuming the
hardware supports that).  For the Wayland/X11/DRM-legacy backends I just
reject this so scanout will be disabled.

The previous behaviour is preserved if buffer_src_box and buffer_dst_box
are unset: the buffer is displayed at native size at the top-left of the
output with no crop.

The change to `struct wlr_output_state` makes this a binary breaking
change (but this works transparently for scene-tree compositors like
labwc after a recompile).
This commit is contained in:
David Turner 2024-10-17 14:24:05 +01:00
parent 47fb00f66d
commit c87ab6465d
10 changed files with 230 additions and 59 deletions
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22
backend/wayland/output.c
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@ -300,6 +300,28 @@ static bool output_test(struct wlr_output *wlr_output,
struct wlr_wl_output *output =
get_wl_output_from_output(wlr_output);
if (state->committed & WLR_OUTPUT_STATE_BUFFER) {
// If the size doesn't match, reject buffer (scaling is not currently
// supported but could be implemented with viewporter)
int pending_width, pending_height;
output_pending_resolution(wlr_output, state,
&pending_width, &pending_height);
if (state->buffer->width != pending_width ||
state->buffer->height != pending_height) {
wlr_log(WLR_DEBUG, "Primary buffer size mismatch");
return false;
}
// Source crop is also not currently supported
struct wlr_fbox src_box;
output_state_get_buffer_src_box(state, &src_box);
if (src_box.x != 0.0 || src_box.y != 0.0 ||
src_box.width != (double)state->buffer->width ||
src_box.height != (double)state->buffer->height) {
wlr_log(WLR_DEBUG, "Source crop not supported in wayland output");
return false;
}
}
uint32_t unsupported = state->committed & ~SUPPORTED_OUTPUT_STATE;
if (unsupported != 0) {
wlr_log(WLR_DEBUG, "Unsupported output state fields: 0x%"PRIx32,