From 83ba577fa8e611ec65055b9f76e7f35bd9b4abf5 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Sun, 28 Jul 2024 01:23:12 -0400
Subject: [PATCH] Add a helper for egl yuv hints

---
 gdk/gdkdmabufegl.c        | 44 +++++++++++++++++++++++++++++++++++++++
 gdk/gdkdmabufeglprivate.h |  5 +++++
 2 files changed, 49 insertions(+)

diff --git a/gdk/gdkdmabufegl.c b/gdk/gdkdmabufegl.c
index 96fe6b951e..2d98121937 100644
--- a/gdk/gdkdmabufegl.c
+++ b/gdk/gdkdmabufegl.c
@@ -289,4 +289,48 @@ gdk_dmabuf_egl_create_image (GdkDisplay      *display,
   return image;
 }
 
+void
+gdk_dmabuf_get_egl_yuv_hints (const GdkDmabuf *dmabuf,
+                              GdkColorState   *color_state,
+                              int             *color_space_hint,
+                              int             *range_hint)
+{
+  gboolean is_yuv;
+  const GdkCicp *cicp;
+
+  cicp = gdk_color_state_get_cicp (color_state);
+
+  if (cicp &&
+      gdk_dmabuf_fourcc_is_yuv (dmabuf->fourcc, &is_yuv) && is_yuv)
+    {
+      if (cicp->range == GDK_CICP_RANGE_NARROW)
+        *range_hint = EGL_YUV_NARROW_RANGE_EXT;
+      else
+        *range_hint = EGL_YUV_FULL_RANGE_EXT;
+
+      switch (cicp->matrix_coefficients)
+        {
+        case 1:
+          *color_space_hint = EGL_ITU_REC709_EXT;
+          break;
+        case 5:
+        case 6:
+          *color_space_hint = EGL_ITU_REC601_EXT;
+          break;
+        case 9:
+          *color_space_hint = EGL_ITU_REC2020_EXT;
+          break;
+        default:
+          *color_space_hint = 0;
+          *range_hint = 0;
+          break;
+        }
+    }
+  else
+    {
+      *color_space_hint = 0;
+      *range_hint = 0;
+    }
+}
+
 #endif  /* HAVE_DMABUF && HAVE_EGL */
diff --git a/gdk/gdkdmabufeglprivate.h b/gdk/gdkdmabufeglprivate.h
index 4ff1a0f614..c9a366be26 100644
--- a/gdk/gdkdmabufeglprivate.h
+++ b/gdk/gdkdmabufeglprivate.h
@@ -15,4 +15,9 @@ EGLImage                    gdk_dmabuf_egl_create_image         (GdkDisplay
                                                                  const GdkDmabuf                *dmabuf,
                                                                  int                             target);
 
+void                        gdk_dmabuf_get_egl_yuv_hints        (const GdkDmabuf                *dmabuf,
+                                                                 GdkColorState                  *color_state,
+                                                                 int                            *color_space_hint,
+                                                                 int                            *range_hint);
+
 #endif  /* HAVE_DMABUF && HAVE_EGL */