[gtk/matthiasc/color-profile-rebased: 10/22] gsk: Linearize colors too

[Matthias Clasen <matthiasc src gnome org>]

commit a7a44c6521ed891d64bbe91017b83fc0f14e3750
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 8 13:19:59 2022 -0400

    gsk: Linearize colors too
    
    Convert all the GdkRGBA colors that we have
    in render nodes to linear sRGB before using
    them. This brings the rendering back in line
    with what cairo produces, except for the video.

 gsk/gl/gskglrenderjob.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
diff --git a/gsk/gl/gskglrenderjob.c b/gsk/gl/gskglrenderjob.c
index 19768662d7..0461cb8899 100644
--- a/gsk/gl/gskglrenderjob.c
+++ b/gsk/gl/gskglrenderjob.c
@@ -27,6 +27,7 @@
 #include <gdk/gdkprofilerprivate.h>
 #include <gdk/gdkrgbaprivate.h>
 #include <gdk/gdkcolorprofileprivate.h>
+#include <gdk/gdkmemoryformatprivate.h>
 #include <gsk/gskrendernodeprivate.h>
 #include <gsk/gskglshaderprivate.h>
 #include <gdk/gdktextureprivate.h>
@@ -989,11 +990,23 @@ gsk_gl_render_job_update_clip (GskGLRenderJob        *job,
   return TRUE;
 }
 
+/* Convert from sRGB floats to linear sRGB half-floats */
 static inline void
 rgba_to_half (const GdkRGBA *rgba,
               guint16        h[4])
 {
-  float_to_half4 ((const float *)rgba, h);
+  GdkRGBA d;
+  gdk_memory_convert ((guchar *) &d,
+                      sizeof (float) * 4,
+                      GDK_MEMORY_R32G32B32A32_FLOAT,
+                      gdk_color_profile_get_srgb_linear (),
+                      (guchar *) rgba,
+                      sizeof (float) * 4,
+                      GDK_MEMORY_R32G32B32A32_FLOAT,
+                      gdk_color_profile_get_srgb (),
+                      1,
+                      1);
+  float_to_half4 ((const float *)&d, h);
 }
 
 /* fill_vertex_data */