[gtk/wip/otte/colorspace: 46/50] Support color profiles in pixbufs

[Benjamin Otte <otte src gnome org>]

commit 5206d02a0db12107c8455bb4638d6b97069d4d73
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Sep 29 15:40:56 2021 -0400

    Support color profiles in pixbufs
    
    When creating a GdkTexture from a GdkPixbuf,
    see if it has an icc profile attached, and if
    so, use it.

 gdk/gdktexture.c | 43 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 7 deletions(-)
---
diff --git a/gdk/gdktexture.c b/gdk/gdktexture.c
index 1d3cb88443..eb0dc3975a 100644
--- a/gdk/gdktexture.c
+++ b/gdk/gdktexture.c
@@ -414,6 +414,30 @@ gdk_texture_new_for_surface (cairo_surface_t *surface)
   return texture;
 }
 
+static GdkColorSpace*
+gdk_color_space_get_from_pixbuf (GdkPixbuf *pixbuf)
+{
+  const char *icc_profile_base64;
+  GdkColorSpace *space = NULL;
+
+  icc_profile_base64 = gdk_pixbuf_get_option (pixbuf, "icc-profile");
+  if (icc_profile_base64)
+    {
+      guchar *icc_data;
+      gsize icc_len;
+      GBytes *bytes;
+
+      icc_data = g_base64_decode (icc_profile_base64, &icc_len);
+      bytes = g_bytes_new_take (icc_data, icc_len);
+      space = gdk_color_space_new_from_icc_profile (bytes, NULL);
+      g_bytes_unref (bytes);
+    }
+  if (!space)
+    space = g_object_ref (gdk_color_space_get_srgb ());
+
+  return space;
+}
+
 /**
  * gdk_texture_new_for_pixbuf:
  * @pixbuf: a `GdkPixbuf`
@@ -431,23 +455,28 @@ gdk_texture_new_for_pixbuf (GdkPixbuf *pixbuf)
 {
   GdkTexture *texture;
   GBytes *bytes;
+  GdkColorSpace *space;
 
   g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
 
+  space = gdk_color_space_get_from_pixbuf (pixbuf);
   bytes = g_bytes_new_with_free_func (gdk_pixbuf_get_pixels (pixbuf),
                                       gdk_pixbuf_get_height (pixbuf)
                                       * gdk_pixbuf_get_rowstride (pixbuf),
                                       g_object_unref,
                                       g_object_ref (pixbuf));
-  texture = gdk_memory_texture_new (gdk_pixbuf_get_width (pixbuf),
-                                    gdk_pixbuf_get_height (pixbuf),
-                                    gdk_pixbuf_get_has_alpha (pixbuf)
-                                    ? GDK_MEMORY_GDK_PIXBUF_ALPHA
-                                    : GDK_MEMORY_GDK_PIXBUF_OPAQUE,
-                                    bytes,
-                                    gdk_pixbuf_get_rowstride (pixbuf));
+
+  texture = gdk_memory_texture_new_with_color_space (gdk_pixbuf_get_width (pixbuf),
+                                                     gdk_pixbuf_get_height (pixbuf),
+                                                     gdk_pixbuf_get_has_alpha (pixbuf)
+                                                     ? GDK_MEMORY_GDK_PIXBUF_ALPHA
+                                                     : GDK_MEMORY_GDK_PIXBUF_OPAQUE,
+                                                     space,
+                                                     bytes,
+                                                     gdk_pixbuf_get_rowstride (pixbuf));
 
   g_bytes_unref (bytes);
+  g_object_unref (space);
 
   return texture;
 }