From a15b35aa105048fa01ac76eefcf0919cad29df20 Mon Sep 17 00:00:00 2001
From: emersion <contact@emersion.fr>
Date: Wed, 1 Nov 2017 14:36:58 +0100
Subject: [PATCH] Remove mysterious hotspot switch in DRM backend

---
 backend/drm/drm.c  | 57 +++++++++++++++++++++-------------------------
 types/wlr_output.c |  4 ++--
 2 files changed, 28 insertions(+), 33 deletions(-)

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 137ca85e..08e6296b 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -533,13 +533,14 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 			return false;
 		}
 
-		if (!wlr_drm_surface_init(&plane->surf, renderer, w, h, GBM_FORMAT_ARGB8888, 0)) {
+		if (!wlr_drm_surface_init(&plane->surf, renderer, w, h,
+				GBM_FORMAT_ARGB8888, 0)) {
 			wlr_log(L_ERROR, "Cannot allocate cursor resources");
 			return false;
 		}
 
-		plane->cursor_bo = gbm_bo_create(renderer->gbm, w, h, GBM_FORMAT_ARGB8888,
-			GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE);
+		plane->cursor_bo = gbm_bo_create(renderer->gbm, w, h,
+			GBM_FORMAT_ARGB8888, GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE);
 		if (!plane->cursor_bo) {
 			wlr_log_errno(L_ERROR, "Failed to create cursor bo");
 			return false;
@@ -552,34 +553,26 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 
 		// TODO the image needs to be rotated depending on the output rotation
 
-		plane->wlr_tex = wlr_render_texture_create(plane->surf.renderer->wlr_rend);
+		plane->wlr_tex =
+			wlr_render_texture_create(plane->surf.renderer->wlr_rend);
 		if (!plane->wlr_tex) {
 			return false;
 		}
 	}
 
-	switch (output->transform) {
-	case WL_OUTPUT_TRANSFORM_NORMAL:
-	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
-		plane->cursor_hotspot_x = hotspot_x;
-		plane->cursor_hotspot_y = hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_90:
-	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
-		plane->cursor_hotspot_x = hotspot_x;
-		plane->cursor_hotspot_y = -plane->surf.height + hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_180:
-	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
-		plane->cursor_hotspot_x = -plane->surf.width + hotspot_x;
-		plane->cursor_hotspot_y = -plane->surf.height + hotspot_y;
-		break;
-	case WL_OUTPUT_TRANSFORM_FLIPPED:
-	case WL_OUTPUT_TRANSFORM_270:
-		plane->cursor_hotspot_x = -plane->surf.width + hotspot_x;
-		plane->cursor_hotspot_y = hotspot_y;
-		break;
-	}
+	struct wlr_box hotspot = {
+		.width = plane->surf.width,
+		.height = plane->surf.height,
+		.x = hotspot_x,
+		.y = hotspot_y,
+	};
+	enum wl_output_transform transform =
+		wlr_output_transform_invert(output->transform);
+	struct wlr_box transformed_hotspot;
+	wlr_output_transform_apply_to_box(transform, &hotspot,
+		&transformed_hotspot);
+	plane->cursor_hotspot_x = transformed_hotspot.x;
+	plane->cursor_hotspot_y = transformed_hotspot.y;
 
 	if (!update_pixels) {
 		// Only update the cursor hotspot
@@ -609,11 +602,13 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 
 	float matrix[16];
 	wlr_texture_get_matrix(plane->wlr_tex, &matrix, &plane->matrix, 0, 0);
-	wlr_render_with_matrix(plane->surf.renderer->wlr_rend, plane->wlr_tex, &matrix);
+	wlr_render_with_matrix(plane->surf.renderer->wlr_rend, plane->wlr_tex,
+		&matrix);
 
 	glFinish();
 	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, bo_stride);
-	glReadPixels(0, 0, plane->surf.width, plane->surf.height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, bo_data);
+	glReadPixels(0, 0, plane->surf.width, plane->surf.height, GL_BGRA_EXT,
+		GL_UNSIGNED_BYTE, bo_data);
 	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0);
 
 	wlr_drm_surface_swap_buffers(&plane->surf);
@@ -627,10 +622,7 @@ static bool wlr_drm_connector_move_cursor(struct wlr_output *output,
 		int x, int y) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
 	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
-
 	struct wlr_drm_plane *plane = conn->crtc->cursor;
-	x -= plane->cursor_hotspot_x;
-	y -= plane->cursor_hotspot_y;
 
 	struct wlr_box box;
 	box.x = x;
@@ -642,6 +634,9 @@ static bool wlr_drm_connector_move_cursor(struct wlr_output *output,
 	struct wlr_box transformed_box;
 	wlr_output_transform_apply_to_box(transform, &box, &transformed_box);
 
+	transformed_box.x -= plane->cursor_hotspot_x;
+	transformed_box.y -= plane->cursor_hotspot_y;
+
 	return drm->iface->crtc_move_cursor(drm, conn->crtc, transformed_box.x,
 		transformed_box.y);
 }
diff --git a/types/wlr_output.c b/types/wlr_output.c
index 6e36ae12..93d4de93 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -294,7 +294,7 @@ void wlr_output_swap_buffers(struct wlr_output *output) {
 	struct wlr_output_cursor *cursor;
 	wl_list_for_each(cursor, &output->cursors, link) {
 		if (output->hardware_cursor == cursor) {
-			//continue; // TODO
+			continue;
 		}
 		output_cursor_render(cursor);
 	}
@@ -342,7 +342,7 @@ bool wlr_output_cursor_set_image(struct wlr_output_cursor *cursor,
 			stride, width, height, hotspot_x, hotspot_y, true);
 		if (ok) {
 			cursor->output->hardware_cursor = cursor;
-			//return true; // TODO
+			return true;
 		}
 	}