diff --git a/testsuite/gdk/memorytexture.c b/testsuite/gdk/memorytexture.c
index f702c42421..4f7a3379a9 100644
--- a/testsuite/gdk/memorytexture.c
+++ b/testsuite/gdk/memorytexture.c
@@ -372,88 +372,102 @@ gdk_memory_format_pixel_print (GdkMemoryFormat  format,
     case GDK_MEMORY_A8R8G8B8:
     case GDK_MEMORY_R8G8B8A8:
     case GDK_MEMORY_A8B8G8R8:
-      g_string_append_printf (string, "%d %d %d %d", data[0], data[1], data[2], data[3]);
+      g_string_append_printf (string, "%02X %02X %02X %02X", data[0], data[1], data[2], data[3]);
       break;
 
     case GDK_MEMORY_B8G8R8X8:
     case GDK_MEMORY_R8G8B8X8:
     case GDK_MEMORY_R8G8B8:
     case GDK_MEMORY_B8G8R8:
-      g_string_append_printf (string, "%d %d %d", data[0], data[1], data[2]);
+      g_string_append_printf (string, "%02X %02X %02X", data[0], data[1], data[2]);
       break;
 
     case GDK_MEMORY_G8A8:
     case GDK_MEMORY_G8A8_PREMULTIPLIED:
-      g_string_append_printf (string, "%d %d", data[0], data[1]);
+      g_string_append_printf (string, "%02X %02X", data[0], data[1]);
       break;
 
     case GDK_MEMORY_A8:
     case GDK_MEMORY_G8:
-      g_string_append_printf (string, "%d", data[0]);
+      g_string_append_printf (string, "%02X", data[0]);
       break;
 
     case GDK_MEMORY_X8R8G8B8:
     case GDK_MEMORY_X8B8G8R8:
-      g_string_append_printf (string, "%d %d %d", data[1], data[2], data[3]);
+      g_string_append_printf (string, "%02X %02X %02X", data[1], data[2], data[3]);
       break;
 
 
     case GDK_MEMORY_R16G16B16A16:
     case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
       {
-        guint16 *data16 = (guint16 *) data;
-        g_string_append_printf (string, "%d %d %d %d", data16[0], data16[1], data16[2], data16[3]);
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%04X %04X %04X %04X", data16[0], data16[1], data16[2], data16[3]);
       }
       break;
 
     case GDK_MEMORY_R16G16B16:
       {
-        guint16 *data16 = (guint16 *) data;
-        g_string_append_printf (string, "%d %d %d", data16[0], data16[1], data16[2]);
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%04X %04X %04X", data16[0], data16[1], data16[2]);
       }
       break;
 
     case GDK_MEMORY_G16A16:
     case GDK_MEMORY_G16A16_PREMULTIPLIED:
       {
-        guint16 *data16 = (guint16 *) data;
-        g_string_append_printf (string, "%d %d", data16[0], data16[1]);
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%04X %04X", data16[0], data16[1]);
       }
       break;
 
     case GDK_MEMORY_G16:
     case GDK_MEMORY_A16:
       {
-        guint16 *data16 = (guint16 *) data;
-        g_string_append_printf (string, "%d", data16[0]);
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%04X", data16[0]);
       }
       break;
 
     case GDK_MEMORY_R16G16B16_FLOAT:
+      {
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%f %f %f", half_to_float (data16[0]), half_to_float (data16[1]), half_to_float (data16[2]));
+      }
+      break;
+
     case GDK_MEMORY_R16G16B16A16_FLOAT:
     case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
+      {
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%f %f %f %f", half_to_float (data16[0]), half_to_float (data16[1]), half_to_float (data16[2]), half_to_float (data16[3]));
+      }
+      break;
     case GDK_MEMORY_A16_FLOAT:
-      g_string_append (string, "FIXME print f16\n");
+      {
+        const guint16 *data16 = (const guint16 *) data;
+        g_string_append_printf (string, "%f", half_to_float (data16[0]));
+      }
       break;
 
     case GDK_MEMORY_R32G32B32A32_FLOAT:
     case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
       {
-        float *dataf = (float *)data;
+        const float *dataf = (const float *) data;
         g_string_append_printf (string, "%f %f %f %f", dataf[0], dataf[1], dataf[2], dataf[3]);
       }
       break;
 
     case GDK_MEMORY_R32G32B32_FLOAT:
       {
-        float *dataf = (float *)data;
+        const float *dataf = (const float *) data;
         g_string_append_printf (string, "%f %f %f", dataf[0], dataf[1], dataf[2]);
       }
       break;
 
     case GDK_MEMORY_A32_FLOAT:
       {
-        float *dataf = (float *)data;
+        const float *dataf = (const float *) data;
         g_string_append_printf (string, "%f", dataf[0]);
       }
       break;