[gtk/wip/alexl/broadway5: 4/13] broadway: Send actual float32, not some hack

[Alexander Larsson <alexl src gnome org>]

commit 24091e7a205f8785696d360644084b88a5ee89bb
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Mar 22 13:42:26 2019 +0100

    broadway: Send actual float32, not some hack

 gdk/broadway/broadway.js  | 10 ++++++----
 gsk/gskbroadwayrenderer.c | 21 +++++++++++++--------
 2 files changed, 19 insertions(+), 12 deletions(-)
---
diff --git a/gdk/broadway/broadway.js b/gdk/broadway/broadway.js
index fc55f4b59b..86259aa0a5 100644
--- a/gdk/broadway/broadway.js
+++ b/gdk/broadway/broadway.js
@@ -316,6 +316,12 @@ SwapNodes.prototype.decode_int32 = function() {
     return v;
 }
 
+SwapNodes.prototype.decode_float = function() {
+    var v = this.node_data.getFloat32(this.data_pos, true);
+    this.data_pos += 4;
+    return v;
+}
+
 SwapNodes.prototype.decode_color = function() {
     var rgba = this.decode_uint32();
     var a = (rgba >> 24) & 0xff;
@@ -330,10 +336,6 @@ SwapNodes.prototype.decode_color = function() {
     return c;
 }
 
-SwapNodes.prototype.decode_float = function() {
-    return this.decode_int32() / 256.0;
-}
-
 SwapNodes.prototype.decode_size = function() {
     var s = new Object();
     s.width = this.decode_float ();
diff --git a/gsk/gskbroadwayrenderer.c b/gsk/gskbroadwayrenderer.c
index 552c9beafb..9350a2ab1f 100644
--- a/gsk/gskbroadwayrenderer.c
+++ b/gsk/gskbroadwayrenderer.c
@@ -72,12 +72,25 @@ gsk_broadway_renderer_render_texture (GskRenderer           *renderer,
   return texture;
 }
 
+/* uint32 is sent in native endianness, and then converted to little endian in broadwayd when sending to 
browser */
 static void
 add_uint32 (GArray *nodes, guint32 v)
 {
   g_array_append_val (nodes, v);
 }
 
+static void
+add_float (GArray *nodes, float f)
+{
+  union {
+    float f;
+    guint32 i;
+  } u;
+
+  u.f = f;
+  g_array_append_val (nodes, u.i);
+}
+
 static guint32
 rgba_to_uint32 (const GdkRGBA *rgba)
 {
@@ -96,14 +109,6 @@ add_rgba (GArray *nodes, const GdkRGBA *rgba)
   g_array_append_val (nodes, c);
 }
 
-static void
-add_float (GArray *nodes, float f)
-{
-  gint32 i = (gint32) (f * 256.0f);
-  guint u = (guint32) i;
-  g_array_append_val (nodes, u);
-}
-
 static void
 add_xy (GArray *nodes, float x, float y, float offset_x, float offset_y)
 {