Merge pull request #2396 from RyanDwyer/fix-resize-wiggle

Correctly track saved surfaces during multiple transactions

include/sway/desktop/transaction.h

@@ -42,17 +42,4 @@ void transaction_notify_view_ready(struct sway_view *view, uint32_t serial);
 void transaction_notify_view_ready_by_size(struct sway_view *view,
 		int width, int height);
 
-/**
- * Get the saved texture that should be rendered for a view.
- *
- * The addresses pointed at by the width and height pointers will be populated
- * with the surface's dimensions, which may be different to the texture's
- * dimensions if output scaling is used.
- *
- * This function should only be called if it is known that the view has
- * instructions.
- */
-struct wlr_texture *transaction_get_saved_texture(struct sway_view *view,
-		int *width, int *height);
-
 #endif

include/sway/tree/view.h

@@ -85,6 +85,9 @@ struct sway_view {
 	bool allow_request_urgent;
 	struct wl_event_source *urgent_timer;
 
+	struct wlr_buffer *saved_buffer;
+	int saved_buffer_width, saved_buffer_height;
+
 	bool destroying;
 
 	list_t *executed_criteria; // struct criteria *
@@ -339,4 +342,8 @@ void view_set_urgent(struct sway_view *view, bool enable);
 
 bool view_is_urgent(struct sway_view *view);
 
+void view_remove_saved_buffer(struct sway_view *view);
+
+void view_save_buffer(struct sway_view *view);
+
 #endif

sway/desktop/render.c

@@ -222,17 +222,14 @@ static void render_saved_view(struct sway_view *view,
 		struct sway_output *output, pixman_region32_t *damage, float alpha) {
 	struct wlr_output *wlr_output = output->wlr_output;
 
-	int width, height;
+	if (!view->saved_buffer || !view->saved_buffer->texture) {
-	struct wlr_texture *texture =
-		transaction_get_saved_texture(view, &width, &height);
-	if (!texture) {
 		return;
 	}
 	struct wlr_box box = {
 		.x = view->swayc->current.view_x - output->swayc->current.swayc_x,
 		.y = view->swayc->current.view_y - output->swayc->current.swayc_y,
-		.width = width,
+		.width = view->saved_buffer_width,
-		.height = height,
+		.height = view->saved_buffer_height,
 	};
 
 	struct wlr_box output_box = {
@@ -252,7 +249,8 @@ static void render_saved_view(struct sway_view *view,
 	wlr_matrix_project_box(matrix, &box, WL_OUTPUT_TRANSFORM_NORMAL, 0,
 		wlr_output->transform_matrix);
 
-	render_texture(wlr_output, damage, texture, &box, matrix, alpha);
+	render_texture(wlr_output, damage, view->saved_buffer->texture,
+			&box, matrix, alpha);
 }
 
 /**
@@ -261,7 +259,7 @@ static void render_saved_view(struct sway_view *view,
 static void render_view(struct sway_output *output, pixman_region32_t *damage,
 		struct sway_container *con, struct border_colors *colors) {
 	struct sway_view *view = con->sway_view;
-	if (view->swayc->instructions->length) {
+	if (view->saved_buffer) {
 		render_saved_view(view, output, damage, view->swayc->alpha);
 	} else {
 		render_view_toplevels(view, output, damage, view->swayc->alpha);
@@ -864,7 +862,7 @@ void output_render(struct sway_output *output, struct timespec *when,
 
 		// TODO: handle views smaller than the output
 		if (fullscreen_con->type == C_VIEW) {
-			if (fullscreen_con->instructions->length) {
+			if (fullscreen_con->sway_view->saved_buffer) {
 				render_saved_view(fullscreen_con->sway_view,
 						output, damage, 1.0f);
 			} else {

sway/desktop/transaction.c

@@ -41,8 +41,6 @@ struct sway_transaction_instruction {
 	struct sway_transaction *transaction;
 	struct sway_container *container;
 	struct sway_container_state state;
-	struct wlr_buffer *saved_buffer;
-	int saved_buffer_width, saved_buffer_height;
 	uint32_t serial;
 	bool ready;
 };
@@ -57,27 +55,6 @@ static struct sway_transaction *transaction_create() {
 	return transaction;
 }
 
-static void remove_saved_view_buffer(
-		struct sway_transaction_instruction *instruction) {
-	if (instruction->saved_buffer) {
-		wlr_buffer_unref(instruction->saved_buffer);
-		instruction->saved_buffer = NULL;
-	}
-}
-
-static void save_view_buffer(struct sway_view *view,
-		struct sway_transaction_instruction *instruction) {
-	if (!sway_assert(instruction->saved_buffer == NULL,
-				"Didn't expect instruction to have a saved buffer already")) {
-		remove_saved_view_buffer(instruction);
-	}
-	if (view->surface && wlr_surface_has_buffer(view->surface)) {
-		instruction->saved_buffer = wlr_buffer_ref(view->surface->buffer);
-		instruction->saved_buffer_width = view->surface->current.width;
-		instruction->saved_buffer_height = view->surface->current.height;
-	}
-}
-
 static void transaction_destroy(struct sway_transaction *transaction) {
 	// Free instructions
 	for (int i = 0; i < transaction->instructions->length; ++i) {
@@ -93,7 +70,6 @@ static void transaction_destroy(struct sway_transaction *transaction) {
 		if (con->destroying && !con->instructions->length) {
 			container_free(con);
 		}
-		remove_saved_view_buffer(instruction);
 		free(instruction);
 	}
 	list_free(transaction->instructions);
@@ -158,9 +134,6 @@ static void transaction_add_container(struct sway_transaction *transaction,
 
 	copy_pending_state(container, &instruction->state);
 
-	if (container->type == C_VIEW) {
-		save_view_buffer(container->sway_view, instruction);
-	}
 	list_add(transaction->instructions, instruction);
 }
 
@@ -220,6 +193,15 @@ static void transaction_apply(struct sway_transaction *transaction) {
 
 		memcpy(&container->current, &instruction->state,
 				sizeof(struct sway_container_state));
+
+		if (container->type == C_VIEW) {
+			if (container->sway_view->saved_buffer) {
+				view_remove_saved_buffer(container->sway_view);
+			}
+			if (container->instructions->length > 1) {
+				view_save_buffer(container->sway_view);
+			}
+		}
 	}
 }
 
@@ -294,6 +276,9 @@ static void transaction_commit(struct sway_transaction *transaction) {
 			// mapping and its default geometry doesn't intersect an output.
 			struct timespec when;
 			wlr_surface_send_frame_done(con->sway_view->surface, &when);
+			if (!con->sway_view->saved_buffer) {
+				view_save_buffer(con->sway_view);
+			}
 		}
 		list_add(con->instructions, instruction);
 	}
@@ -400,18 +385,6 @@ void transaction_notify_view_ready_by_size(struct sway_view *view,
 	}
 }
 
-struct wlr_texture *transaction_get_saved_texture(struct sway_view *view,
-		int *width, int *height) {
-	struct sway_transaction_instruction *instruction =
-		view->swayc->instructions->items[0];
-	if (!instruction->saved_buffer) {
-		return NULL;
-	}
-	*width = instruction->saved_buffer_width;
-	*height = instruction->saved_buffer_height;
-	return instruction->saved_buffer->texture;
-}
-
 void transaction_commit_dirty(void) {
 	if (!server.dirty_containers->length) {
 		return;

sway/tree/view.c

@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <wayland-server.h>
 #include <wlr/render/wlr_renderer.h>
+#include <wlr/types/wlr_buffer.h>
 #include <wlr/types/wlr_output_layout.h>
 #include "config.h"
 #ifdef HAVE_XWAYLAND
@@ -1093,3 +1094,22 @@ void view_set_urgent(struct sway_view *view, bool enable) {
 bool view_is_urgent(struct sway_view *view) {
 	return view->urgent.tv_sec || view->urgent.tv_nsec;
 }
+
+void view_remove_saved_buffer(struct sway_view *view) {
+	if (!sway_assert(view->saved_buffer, "Expected a saved buffer")) {
+		return;
+	}
+	wlr_buffer_unref(view->saved_buffer);
+	view->saved_buffer = NULL;
+}
+
+void view_save_buffer(struct sway_view *view) {
+	if (!sway_assert(!view->saved_buffer, "Didn't expect saved buffer")) {
+		view_remove_saved_buffer(view);
+	}
+	if (view->surface && wlr_surface_has_buffer(view->surface)) {
+		view->saved_buffer = wlr_buffer_ref(view->surface->buffer);
+		view->saved_buffer_width = view->surface->current.width;
+		view->saved_buffer_height = view->surface->current.height;
+	}
+}