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-rw-r--r--rootston/layer_shell.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/rootston/layer_shell.c b/rootston/layer_shell.c
new file mode 100644
index 00000000..d3a91659
--- /dev/null
+++ b/rootston/layer_shell.c
@@ -0,0 +1,315 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <wayland-server.h>
+#include <wlr/types/wlr_box.h>
+#include <wlr/types/wlr_surface.h>
+#include <wlr/types/wlr_layer_shell.h>
+#include <wlr/util/log.h>
+#include "rootston/desktop.h"
+#include "rootston/layers.h"
+#include "rootston/output.h"
+#include "rootston/server.h"
+
+static void apply_exclusive(struct wlr_box *usable_area,
+ uint32_t anchor, int32_t exclusive,
+ int32_t margin_top, int32_t margin_right,
+ int32_t margin_bottom, int32_t margin_left) {
+ if (exclusive <= 0) {
+ return;
+ }
+ struct {
+ uint32_t anchors;
+ int *positive_axis;
+ int *negative_axis;
+ int margin;
+ } edges[] = {
+ {
+ .anchors =
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP,
+ .positive_axis = &usable_area->y,
+ .negative_axis = &usable_area->height,
+ .margin = margin_top,
+ },
+ {
+ .anchors =
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+ .positive_axis = NULL,
+ .negative_axis = &usable_area->height,
+ .margin = margin_bottom,
+ },
+ {
+ .anchors =
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+ .positive_axis = &usable_area->x,
+ .negative_axis = &usable_area->width,
+ .margin = margin_left,
+ },
+ {
+ .anchors =
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
+ ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM,
+ .positive_axis = NULL,
+ .negative_axis = &usable_area->width,
+ .margin = margin_right,
+ },
+ };
+ for (size_t i = 0; i < sizeof(edges) / sizeof(edges[0]); ++i) {
+ if ((anchor & edges[i].anchors) == edges[i].anchors) {
+ if (edges[i].positive_axis) {
+ *edges[i].positive_axis += exclusive + edges[i].margin;
+ }
+ if (edges[i].negative_axis) {
+ *edges[i].negative_axis -= exclusive + edges[i].margin;
+ }
+ }
+ }
+}
+
+static void arrange_layer(struct wlr_output *output, struct wl_list *list,
+ struct wlr_box *usable_area, bool exclusive) {
+ struct roots_layer_surface *roots_surface;
+ struct wlr_box full_area = { 0 };
+ wlr_output_effective_resolution(output,
+ &full_area.width, &full_area.height);
+ wl_list_for_each(roots_surface, list, link) {
+ struct wlr_layer_surface *layer = roots_surface->layer_surface;
+ struct wlr_layer_surface_state *state = &layer->current;
+ if (exclusive != (state->exclusive_zone > 0)) {
+ continue;
+ }
+ struct wlr_box bounds;
+ if (state->exclusive_zone == -1) {
+ bounds = full_area;
+ } else {
+ bounds = *usable_area;
+ }
+ struct wlr_box box = {
+ .width = state->desired_width,
+ .height = state->desired_height
+ };
+ // Horizontal axis
+ const uint32_t both_horiz = ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT
+ | ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT;
+ if ((state->anchor & both_horiz) && box.width == 0) {
+ box.x = bounds.x;
+ box.width = bounds.width;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
+ box.x = bounds.x;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
+ box.x = bounds.x + (bounds.width - box.width);
+ } else {
+ box.x = bounds.x + ((bounds.width / 2) - (box.width / 2));
+ }
+ // Vertical axis
+ const uint32_t both_vert = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP
+ | ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM;
+ if ((state->anchor & both_vert) && box.height == 0) {
+ box.y = bounds.y;
+ box.height = bounds.height;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
+ box.y = bounds.y;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
+ box.y = bounds.y + (bounds.height - box.height);
+ } else {
+ box.y = bounds.y + ((bounds.height / 2) - (box.height / 2));
+ }
+ // Margin
+ if ((state->anchor & both_horiz) == both_horiz) {
+ box.x += state->margin.left;
+ box.width -= state->margin.left + state->margin.right;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT)) {
+ box.x += state->margin.left;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT)) {
+ box.x -= state->margin.right;
+ }
+ if ((state->anchor & both_vert) == both_vert) {
+ box.y += state->margin.top;
+ box.height -= state->margin.top + state->margin.bottom;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP)) {
+ box.y += state->margin.top;
+ } else if ((state->anchor & ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM)) {
+ box.y -= state->margin.bottom;
+ }
+ if (box.width < 0 || box.height < 0) {
+ // TODO: Bubble up a protocol error?
+ wlr_layer_surface_close(layer);
+ continue;
+ }
+ // Apply
+ roots_surface->geo = box;
+ apply_exclusive(usable_area, state->anchor, state->exclusive_zone,
+ state->margin.top, state->margin.right,
+ state->margin.bottom, state->margin.left);
+ wlr_layer_surface_configure(layer, box.width, box.height);
+ }
+}
+
+void arrange_layers(struct roots_output *output) {
+ struct wlr_box usable_area = { 0 };
+ wlr_output_effective_resolution(output->wlr_output,
+ &usable_area.width, &usable_area.height);
+
+ // Arrange exclusive surfaces from top->bottom
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
+ &usable_area, true);
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
+ &usable_area, true);
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
+ &usable_area, true);
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
+ &usable_area, true);
+ memcpy(&output->usable_area, &usable_area, sizeof(struct wlr_box));
+
+ struct roots_view *view;
+ wl_list_for_each(view, &output->desktop->views, link) {
+ if (view->maximized) {
+ view_arrange_maximized(view);
+ }
+ }
+
+ // Arrange non-exlusive surfaces from top->bottom
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
+ &usable_area, false);
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
+ &usable_area, false);
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
+ &usable_area, false);
+ arrange_layer(output->wlr_output,
+ &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
+ &usable_area, false);
+}
+
+static void handle_output_destroy(struct wl_listener *listener, void *data) {
+ struct roots_layer_surface *layer =
+ wl_container_of(listener, layer, output_destroy);
+ layer->layer_surface->output = NULL;
+ wl_list_remove(&layer->output_destroy.link);
+ wlr_layer_surface_close(layer->layer_surface);
+}
+
+static void handle_surface_commit(struct wl_listener *listener, void *data) {
+ struct roots_layer_surface *layer =
+ wl_container_of(listener, layer, surface_commit);
+ struct wlr_layer_surface *layer_surface = layer->layer_surface;
+ struct wlr_output *wlr_output = layer_surface->output;
+ if (wlr_output != NULL) {
+ struct roots_output *output = wlr_output->data;
+ struct wlr_box old_geo = layer->geo;
+ arrange_layers(output);
+ if (memcmp(&old_geo, &layer->geo, sizeof(struct wlr_box)) != 0) {
+ output_damage_whole_local_surface(output, layer_surface->surface,
+ old_geo.x, old_geo.y, 0);
+ output_damage_whole_local_surface(output, layer_surface->surface,
+ layer->geo.x, layer->geo.y, 0);
+ } else {
+ output_damage_from_local_surface(output, layer_surface->surface,
+ layer->geo.x, layer->geo.y, 0);
+ }
+ }
+}
+
+static void unmap(struct wlr_layer_surface *layer_surface) {
+ struct roots_layer_surface *layer = layer_surface->data;
+ struct wlr_output *wlr_output = layer_surface->output;
+ if (wlr_output != NULL) {
+ struct roots_output *output = wlr_output->data;
+ wlr_output_damage_add_box(output->damage, &layer->geo);
+ }
+}
+
+static void handle_destroy(struct wl_listener *listener, void *data) {
+ struct roots_layer_surface *layer = wl_container_of(
+ listener, layer, destroy);
+ if (layer->layer_surface->mapped) {
+ unmap(layer->layer_surface);
+ }
+ wl_list_remove(&layer->link);
+ wl_list_remove(&layer->destroy.link);
+ wl_list_remove(&layer->map.link);
+ wl_list_remove(&layer->unmap.link);
+ wl_list_remove(&layer->surface_commit.link);
+ wl_list_remove(&layer->output_destroy.link);
+ arrange_layers((struct roots_output *)layer->layer_surface->output->data);
+ free(layer);
+}
+
+static void handle_map(struct wl_listener *listener, void *data) {
+ struct wlr_layer_surface *layer_surface = data;
+ struct roots_layer_surface *layer = layer_surface->data;
+ struct wlr_output *wlr_output = layer_surface->output;
+ struct roots_output *output = wlr_output->data;
+ wlr_output_damage_add_box(output->damage, &layer->geo);
+}
+
+static void handle_unmap(struct wl_listener *listener, void *data) {
+ struct roots_layer_surface *layer = wl_container_of(
+ listener, layer, unmap);
+ unmap(layer->layer_surface);
+}
+
+void handle_layer_shell_surface(struct wl_listener *listener, void *data) {
+ struct wlr_layer_surface *layer_surface = data;
+ struct roots_desktop *desktop =
+ wl_container_of(listener, desktop, layer_shell_surface);
+ wlr_log(L_DEBUG, "new layer surface: namespace %s layer %d anchor %d "
+ "size %dx%d margin %d,%d,%d,%d",
+ layer_surface->namespace, layer_surface->layer, layer_surface->layer,
+ layer_surface->client_pending.desired_width,
+ layer_surface->client_pending.desired_height,
+ layer_surface->client_pending.margin.top,
+ layer_surface->client_pending.margin.right,
+ layer_surface->client_pending.margin.bottom,
+ layer_surface->client_pending.margin.left);
+
+ struct roots_layer_surface *roots_surface =
+ calloc(1, sizeof(struct roots_layer_surface));
+ if (!roots_surface) {
+ return;
+ }
+
+ roots_surface->surface_commit.notify = handle_surface_commit;
+ wl_signal_add(&layer_surface->surface->events.commit,
+ &roots_surface->surface_commit);
+
+ roots_surface->output_destroy.notify = handle_output_destroy;
+ wl_signal_add(&layer_surface->output->events.destroy,
+ &roots_surface->output_destroy);
+
+ roots_surface->destroy.notify = handle_destroy;
+ wl_signal_add(&layer_surface->events.destroy, &roots_surface->destroy);
+ roots_surface->map.notify = handle_map;
+ wl_signal_add(&layer_surface->events.map, &roots_surface->map);
+ roots_surface->unmap.notify = handle_unmap;
+ wl_signal_add(&layer_surface->events.unmap, &roots_surface->unmap);
+ // TODO: Listen for subsurfaces
+
+ roots_surface->layer_surface = layer_surface;
+ layer_surface->data = roots_surface;
+
+ struct roots_output *output = layer_surface->output->data;
+ wl_list_insert(&output->layers[layer_surface->layer], &roots_surface->link);
+
+ // Temporarily set the layer's current state to client_pending
+ // So that we can easily arrange it
+ struct wlr_layer_surface_state old_state = layer_surface->current;
+ layer_surface->current = layer_surface->client_pending;
+
+ arrange_layers(output);
+
+ layer_surface->current = old_state;
+}