From e7455f48a37cff8d15bdd3ca12daadb81bfc2423 Mon Sep 17 00:00:00 2001
From: notbabaisyou <though-went-some-simple@proton.me>
Date: Thu, 14 Aug 2025 13:52:52 +0200
Subject: [PATCH] hw/modesetting: Add drmmode_get_cursor_limit.

Used in upcoming commit.
---
 .../video/modesetting/drmmode_display.c       | 34 +++++++++++++++++++
 .../video/modesetting/drmmode_display.h       |  2 ++
 2 files changed, 36 insertions(+)

diff --git a/hw/xfree86/drivers/video/modesetting/drmmode_display.c b/hw/xfree86/drivers/video/modesetting/drmmode_display.c
index 139b9529f7..10de202901 100644
--- a/hw/xfree86/drivers/video/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/video/modesetting/drmmode_display.c
@@ -4598,6 +4598,40 @@ drmmode_crtc_set_vrr(xf86CrtcPtr crtc, Bool enabled)
         drmmode_crtc->vrr_enabled = enabled;
 }
 
+Bool drmmode_get_cursor_limit(ScrnInfoPtr pScrn, drmmode_cursor_dim_ptr cursor_lim)
+{
+    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
+    int max_width = 0, max_height = 0, i;
+
+    if (!cursor_lim)
+        return FALSE;
+
+    for (i = 0; i < xf86_config->num_crtc; i++) {
+        xf86CrtcPtr crtc = xf86_config->crtc[i];
+        drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+        drmmode_cursor_rec cursor = drmmode_crtc->cursor;
+
+        /* Very ugly. */
+        drmmode_cursor_dim_rec largest = cursor.dimensions[cursor.num_dimensions - 1];
+
+        int width  = largest.width;
+        int height = largest.height;
+
+        /**
+         * TODO: We should only let sizes that all CRTCs support.
+         */
+        if (width > max_width && height > max_height)
+        {
+            max_width  = width;
+            max_height = height;
+        }
+    }
+
+    cursor_lim->width  = max_width;
+    cursor_lim->height = max_height;
+    return TRUE;
+}
+
 /*
  * We hook the screen's cursor-sprite (swcursor) functions to see if a swcursor
  * is active. When a swcursor is active we disable page-flipping.
diff --git a/hw/xfree86/drivers/video/modesetting/drmmode_display.h b/hw/xfree86/drivers/video/modesetting/drmmode_display.h
index d470e2d417..27948246d4 100644
--- a/hw/xfree86/drivers/video/modesetting/drmmode_display.h
+++ b/hw/xfree86/drivers/video/modesetting/drmmode_display.h
@@ -355,4 +355,6 @@ Bool drmmode_crtc_get_fb_id(xf86CrtcPtr crtc, uint32_t *fb_id, int *x, int *y);
 void drmmode_set_dpms(ScrnInfoPtr scrn, int PowerManagementMode, int flags);
 void drmmode_crtc_set_vrr(xf86CrtcPtr crtc, Bool enabled);
 
+Bool drmmode_get_cursor_limit(ScrnInfoPtr pScrn, drmmode_cursor_dim_ptr cursor_lim);
+
 #endif