[PATCH 3/4] drm/panic: simplify logo handling

[Jocelyn Falempe <jfalempe@redhat.com>]

Move logo rectangle initialisation, and logo drawing in separate
functions, so they can be re-used by different panic screens.
It prepares the introduction of the QR-code panic screen.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
---
 drivers/gpu/drm/drm_panic.c | 57 +++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index 9e06609e1799..450585374ca9 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -80,6 +80,7 @@ static struct drm_panic_line panic_msg[] = {
 	PANIC_LINE(""),
 	PANIC_LINE("Please reboot your computer."),
 };
+static const int panic_msg_lines = ARRAY_SIZE(panic_msg);
 
 static const struct drm_panic_line logo_ascii[] = {
 	PANIC_LINE("     .--.        _"),
@@ -90,6 +91,7 @@ static const struct drm_panic_line logo_ascii[] = {
 	PANIC_LINE(" /'\\_   _/`\\    (_)"),
 	PANIC_LINE(" \\___)=(___/"),
 };
+static const int logo_ascii_lines = ARRAY_SIZE(logo_ascii);
 
 #if defined(CONFIG_LOGO) && !defined(MODULE)
 static const struct linux_logo *logo_mono;
@@ -488,33 +490,45 @@ static void draw_txt_rectangle(struct drm_scanout_buffer *sb,
 	}
 }
 
+static void drm_panic_logo_rect(struct drm_rect *rect, const struct font_desc *font)
+{
+	if (logo_mono)
+		drm_rect_init(rect, 0, 0, logo_mono->width, logo_mono->height);
+	else {
+		int logo_width = get_max_line_len(logo_ascii, logo_ascii_lines) * font->width;
+
+		drm_rect_init(rect, 0, 0, logo_width, logo_ascii_lines * font->height);
+	}
+}
+
+static void drm_panic_logo_draw(struct drm_scanout_buffer *sb, struct drm_rect *rect,
+				const struct font_desc *font, u32 fg_color)
+{
+	if (logo_mono)
+		drm_panic_blit(sb, rect, logo_mono->data,
+			       DIV_ROUND_UP(drm_rect_width(rect), 8), 1, fg_color);
+	else
+		draw_txt_rectangle(sb, font, logo_ascii, logo_ascii_lines, false, rect,
+				   fg_color);
+}
+
 static void draw_panic_static_user(struct drm_scanout_buffer *sb)
 {
-	size_t msg_lines = ARRAY_SIZE(panic_msg);
-	size_t logo_ascii_lines = ARRAY_SIZE(logo_ascii);
 	u32 fg_color = convert_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND_COLOR, sb->format->format);
 	u32 bg_color = convert_from_xrgb8888(CONFIG_DRM_PANIC_BACKGROUND_COLOR, sb->format->format);
 	const struct font_desc *font = get_default_font(sb->width, sb->height, NULL, NULL);
 	struct drm_rect r_screen, r_logo, r_msg;
-	unsigned int logo_width, logo_height;
+	unsigned int panic_msg_width;
 
 	if (!font)
 		return;
 
 	r_screen = DRM_RECT_INIT(0, 0, sb->width, sb->height);
-
-	if (logo_mono) {
-		logo_width = logo_mono->width;
-		logo_height = logo_mono->height;
-	} else {
-		logo_width = get_max_line_len(logo_ascii, logo_ascii_lines) * font->width;
-		logo_height = logo_ascii_lines * font->height;
-	}
-
-	r_logo = DRM_RECT_INIT(0, 0, logo_width, logo_height);
+	drm_panic_logo_rect(&r_logo, font);
+	panic_msg_width = get_max_line_len(panic_msg, panic_msg_lines) * font->width;
 	r_msg = DRM_RECT_INIT(0, 0,
-			      min(get_max_line_len(panic_msg, msg_lines) * font->width, sb->width),
-			      min(msg_lines * font->height, sb->height));
+			      min(panic_msg_width, sb->width),
+			      min(panic_msg_lines * font->height, sb->height));
 
 	/* Center the panic message */
 	drm_rect_translate(&r_msg, (sb->width - r_msg.x2) / 2, (sb->height - r_msg.y2) / 2);
@@ -522,15 +536,10 @@ 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 (!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);
-		else
-			draw_txt_rectangle(sb, font, logo_ascii, logo_ascii_lines, false, &r_logo,
-					   fg_color);
-	}
-	draw_txt_rectangle(sb, font, panic_msg, msg_lines, true, &r_msg, fg_color);
+	if (!drm_rect_overlap(&r_logo, &r_msg))
+		drm_panic_logo_draw(sb, &r_logo, font, fg_color);
+
+	draw_txt_rectangle(sb, font, panic_msg, panic_msg_lines, true, &r_msg, fg_color);
 }
 
 /*
-- 
2.45.2