linux-kernel - [PATCH v4 2/4] drm/rect: Add drm_rect

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Message-ID: <20240717142644.1106060-3-jfalempe@redhat.com>
Date: Wed, 17 Jul 2024 16:24:49 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	"Bjorn Roy Baron" <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...hat.com>
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Subject: [PATCH v4 2/4] drm/rect: Add drm_rect_overlap()

Check if two rectangles overlap.
It's a bit similar to drm_rect_intersect() but this won't modify
the rectangle.
Simplifies a bit drm_panic.

Signed-off-by: Jocelyn Falempe <jfalempe@...hat.com>
---
 drivers/gpu/drm/drm_panic.c |  3 +--
 include/drm/drm_rect.h      | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index fa147542d801..1693348b19a6 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -522,8 +522,7 @@ static void draw_panic_static_user(struct drm_scanout_buffer *sb)
 	/* Fill with the background color, and draw text on top */
 	drm_panic_fill(sb, &r_screen, bg_color);
 
-	if ((r_msg.x1 >= logo_width || r_msg.y1 >= logo_height) &&
-	    logo_width <= sb->width && logo_height <= sb->height) {
+	if (!drm_rect_overlap(&r_logo, &r_msg)) {
 		if (logo_mono)
 			drm_panic_blit(sb, &r_logo, logo_mono->data, DIV_ROUND_UP(logo_width, 8),
 				       fg_color);
diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
index 73fcb899a01d..7bafde747d56 100644
--- a/include/drm/drm_rect.h
+++ b/include/drm/drm_rect.h
@@ -238,6 +238,21 @@ static inline void drm_rect_fp_to_int(struct drm_rect *dst,
 		      drm_rect_height(src) >> 16);
 }
 
+/**
+ * drm_rect_overlap - Check if two rectangles overlap
+ * @r1: first rectangle
+ * @r2: second rectangle
+ *
+ * RETURNS:
+ * %true if the rectangles overlap, %false otherwise.
+ */
+static inline bool drm_rect_overlap(const struct drm_rect *r1,
+				    const struct drm_rect *r2)
+{
+	return (r1->x2 > r2->x1 && r2->x2 > r1->x1 &&
+		r1->y2 > r2->y1 && r2->y2 > r1->y1);
+}
+
 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
 			  const struct drm_rect *clip);
-- 
2.45.2