[gtk+] linear-gradient: Remove the hack using NUMBER

[Benjamin Otte <otte src gnome org>]

commit 7b301fcece6a9f2a18afc2e5e2169da9b6545bbf
Author: Benjamin Otte <otte redhat com>
Date:   Fri Feb 12 04:09:44 2016 +0100

    linear-gradient: Remove the hack using NUMBER
    
    Instead, add a "side" member to the struct that keeps sides explicitly.

 gtk/gtkcssimagelinear.c        |   63 +++++++++++++++++++---------------------
 gtk/gtkcssimagelinearprivate.h |    3 +-
 2 files changed, 32 insertions(+), 34 deletions(-)
---
diff --git a/gtk/gtkcssimagelinear.c b/gtk/gtkcssimagelinear.c
index 492d04a..6b8ff2a 100644
--- a/gtk/gtkcssimagelinear.c
+++ b/gtk/gtkcssimagelinear.c
@@ -142,12 +142,10 @@ gtk_css_image_linear_draw (GtkCssImage        *image,
   double offset;
   int i, last;
 
-  if (_gtk_css_number_value_get_unit (linear->angle) == GTK_CSS_NUMBER)
+  if (linear->side)
     {
-      guint side = _gtk_css_number_value_get (linear->angle, 100);
-
       /* special casing the regular cases here so we don't get rounding errors */
-      switch (side)
+      switch (linear->side)
       {
         case 1 << GTK_CSS_RIGHT:
           angle = 90;
@@ -162,8 +160,8 @@ gtk_css_image_linear_draw (GtkCssImage        *image,
           angle = 180;
           break;
         default:
-          angle = atan2 (side & 1 << GTK_CSS_TOP ? -width : width,
-                         side & 1 << GTK_CSS_LEFT ? -height : height);
+          angle = atan2 (linear->side & 1 << GTK_CSS_TOP ? -width : width,
+                         linear->side & 1 << GTK_CSS_LEFT ? -height : height);
           angle = 180 * angle / G_PI + 90;
           break;
       }
@@ -258,58 +256,54 @@ gtk_css_image_linear_parse (GtkCssImage  *image,
 
   if (_gtk_css_parser_try (parser, "to", TRUE))
     {
-      guint side = 0;
-
       for (i = 0; i < 2; i++)
         {
           if (_gtk_css_parser_try (parser, "left", TRUE))
             {
-              if (side & ((1 << GTK_CSS_LEFT) | (1 << GTK_CSS_RIGHT)))
+              if (linear->side & ((1 << GTK_CSS_LEFT) | (1 << GTK_CSS_RIGHT)))
                 {
                   _gtk_css_parser_error (parser, "Expected 'top', 'bottom' or comma");
                   return FALSE;
                 }
-              side |= (1 << GTK_CSS_LEFT);
+              linear->side |= (1 << GTK_CSS_LEFT);
             }
           else if (_gtk_css_parser_try (parser, "right", TRUE))
             {
-              if (side & ((1 << GTK_CSS_LEFT) | (1 << GTK_CSS_RIGHT)))
+              if (linear->side & ((1 << GTK_CSS_LEFT) | (1 << GTK_CSS_RIGHT)))
                 {
                   _gtk_css_parser_error (parser, "Expected 'top', 'bottom' or comma");
                   return FALSE;
                 }
-              side |= (1 << GTK_CSS_RIGHT);
+              linear->side |= (1 << GTK_CSS_RIGHT);
             }
           else if (_gtk_css_parser_try (parser, "top", TRUE))
             {
-              if (side & ((1 << GTK_CSS_TOP) | (1 << GTK_CSS_BOTTOM)))
+              if (linear->side & ((1 << GTK_CSS_TOP) | (1 << GTK_CSS_BOTTOM)))
                 {
                   _gtk_css_parser_error (parser, "Expected 'left', 'right' or comma");
                   return FALSE;
                 }
-              side |= (1 << GTK_CSS_TOP);
+              linear->side |= (1 << GTK_CSS_TOP);
             }
           else if (_gtk_css_parser_try (parser, "bottom", TRUE))
             {
-              if (side & ((1 << GTK_CSS_TOP) | (1 << GTK_CSS_BOTTOM)))
+              if (linear->side & ((1 << GTK_CSS_TOP) | (1 << GTK_CSS_BOTTOM)))
                 {
                   _gtk_css_parser_error (parser, "Expected 'left', 'right' or comma");
                   return FALSE;
                 }
-              side |= (1 << GTK_CSS_BOTTOM);
+              linear->side |= (1 << GTK_CSS_BOTTOM);
             }
           else
             break;
         }
 
-      if (side == 0)
+      if (linear->side == 0)
         {
           _gtk_css_parser_error (parser, "Expected side that gradient should go to");
           return FALSE;
         }
 
-      linear->angle = _gtk_css_number_value_new (side, GTK_CSS_NUMBER);
-
       if (!_gtk_css_parser_try (parser, ",", TRUE))
         {
           _gtk_css_parser_error (parser, "Expected a comma");
@@ -329,7 +323,7 @@ gtk_css_image_linear_parse (GtkCssImage  *image,
         }
     }
   else
-    linear->angle = _gtk_css_number_value_new (1 << GTK_CSS_BOTTOM, GTK_CSS_NUMBER);
+    linear->side = 1 << GTK_CSS_BOTTOM;
 
   do {
     GtkCssImageLinearColorStop stop;
@@ -379,22 +373,20 @@ gtk_css_image_linear_print (GtkCssImage *image,
   else
     g_string_append (string, "linear-gradient(");
 
-  if (_gtk_css_number_value_get_unit (linear->angle) == GTK_CSS_NUMBER)
+  if (linear->side)
     {
-      guint side = _gtk_css_number_value_get (linear->angle, 100);
-
-      if (side != (1 << GTK_CSS_BOTTOM))
+      if (linear->side != (1 << GTK_CSS_BOTTOM))
         {
           g_string_append (string, "to");
 
-          if (side & (1 << GTK_CSS_TOP))
+          if (linear->side & (1 << GTK_CSS_TOP))
             g_string_append (string, " top");
-          else if (side & (1 << GTK_CSS_BOTTOM))
+          else if (linear->side & (1 << GTK_CSS_BOTTOM))
             g_string_append (string, " bottom");
 
-          if (side & (1 << GTK_CSS_LEFT))
+          if (linear->side & (1 << GTK_CSS_LEFT))
             g_string_append (string, " left");
-          else if (side & (1 << GTK_CSS_RIGHT))
+          else if (linear->side & (1 << GTK_CSS_RIGHT))
             g_string_append (string, " right");
 
           g_string_append (string, ", ");
@@ -440,8 +432,10 @@ gtk_css_image_linear_compute (GtkCssImage             *image,
 
   copy = g_object_new (GTK_TYPE_CSS_IMAGE_LINEAR, NULL);
   copy->repeating = linear->repeating;
+  copy->side = linear->side;
 
-  copy->angle = _gtk_css_value_compute (linear->angle, property_id, provider, style, parent_style);
+  if (linear->angle)
+    copy->angle = _gtk_css_value_compute (linear->angle, property_id, provider, style, parent_style);
   
   g_array_set_size (copy->stops, linear->stops->len);
   for (i = 0; i < linear->stops->len; i++)
@@ -492,11 +486,12 @@ gtk_css_image_linear_transition (GtkCssImage *start_image,
   result = g_object_new (GTK_TYPE_CSS_IMAGE_LINEAR, NULL);
   result->repeating = start->repeating;
 
-  if (_gtk_css_number_value_get_unit (start->angle) == GTK_CSS_NUMBER ||
-      _gtk_css_number_value_get_unit (end->angle) == GTK_CSS_NUMBER)
+  if (start->side != end->side)
     goto fail;
 
-  result->angle = _gtk_css_value_transition (start->angle, end->angle, property_id, progress);
+  result->side = start->side;
+  if (result->side == 0)
+    result->angle = _gtk_css_value_transition (start->angle, end->angle, property_id, progress);
   if (result->angle == NULL)
     goto fail;
   
@@ -554,7 +549,8 @@ gtk_css_image_linear_equal (GtkCssImage *image1,
   guint i;
 
   if (linear1->repeating != linear2->repeating ||
-      !_gtk_css_value_equal (linear1->angle, linear2->angle) ||
+      linear1->side != linear2->side ||
+      (linear1->side == 0 && !_gtk_css_value_equal (linear1->angle, linear2->angle)) ||
       linear1->stops->len != linear2->stops->len)
     return FALSE;
 
@@ -584,6 +580,7 @@ gtk_css_image_linear_dispose (GObject *object)
       linear->stops = NULL;
     }
 
+  linear->side = 0;
   if (linear->angle)
     {
       _gtk_css_value_unref (linear->angle);
diff --git a/gtk/gtkcssimagelinearprivate.h b/gtk/gtkcssimagelinearprivate.h
index 6988abe..42d6907 100644
--- a/gtk/gtkcssimagelinearprivate.h
+++ b/gtk/gtkcssimagelinearprivate.h
@@ -45,7 +45,8 @@ struct _GtkCssImageLinear
 {
   GtkCssImage parent;
 
-  GtkCssValue *angle; /* warning: We use GTK_CSS_NUMBER as an enum for the corners */
+  guint        side;  /* side the gradient should go to or 0 for angle */
+  GtkCssValue *angle;
   GArray *stops;
   guint repeating :1;
 };