Support ROW_REVERSE, COLUMN_REVERSE and RTL direction

src/Layout.h

@@ -23,9 +23,17 @@ static const unsigned long __nan[2] = {0xffffffff, 0x7fffffff};
 
 #define CSS_UNDEFINED NAN
 
+typedef enum {
+  CSS_DIRECTION_INHERIT = 0,
+  CSS_DIRECTION_LTR,
+  CSS_DIRECTION_RTL
+} css_direction_t;
+
 typedef enum {
   CSS_FLEX_DIRECTION_COLUMN = 0,
-  CSS_FLEX_DIRECTION_ROW
+  CSS_FLEX_DIRECTION_COLUMN_REVERSE,
+  CSS_FLEX_DIRECTION_ROW,
+  CSS_FLEX_DIRECTION_ROW_REVERSE
 } css_flex_direction_t;
 
 typedef enum {
@@ -72,7 +80,7 @@ typedef enum {
 } css_dimension_t;
 
 typedef struct {
-  float position[2];
+  float position[4];
   float dimensions[2];
 
   // Instead of recomputing the entire layout every single time, we
@@ -82,6 +90,7 @@ typedef struct {
   float last_parent_max_width;
   float last_dimensions[2];
   float last_position[2];
+  css_direction_t last_direction;
 } css_layout_t;
 
 typedef struct {
@@ -89,6 +98,7 @@ typedef struct {
 } css_dim_t;
 
 typedef struct {
+  css_direction_t direction;
   css_flex_direction_t flex_direction;
   css_justify_t justify_content;
   css_align_t align_items;
@@ -142,7 +152,7 @@ typedef enum {
 void print_css_node(css_node_t *node, css_print_options_t options);
 
 // Function that computes the layout!
-void layoutNode(css_node_t *node, float maxWidth);
+void layoutNode(css_node_t *node, float maxWidth, css_direction_t parentDirection);
 bool isUndefined(float value);
 
 #endif