[librsvg] StopOpacity: Turn into a struct; put both the "kind" enum and the actual opacity value here

[Federico Mena Quintero <federico src gnome org>]

commit d644712c05ee2320403ca7cf6e726438355b602e
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue May 30 16:32:01 2017 -0500

    StopOpacity: Turn into a struct; put both the "kind" enum and the actual opacity value here
    
    This makes the stop-opacity property be similar to the stop-color one.

 rsvg-paint-server.c |    8 ++++----
 rsvg-styles.c       |   11 +++++------
 rsvg-styles.h       |   15 ++++++++++-----
 3 files changed, 19 insertions(+), 15 deletions(-)
---
diff --git a/rsvg-paint-server.c b/rsvg-paint-server.c
index 3609c77..c8c9e19 100644
--- a/rsvg-paint-server.c
+++ b/rsvg-paint-server.c
@@ -297,15 +297,15 @@ rsvg_stop_set_atts (RsvgNode *node, gpointer impl, RsvgHandle *handle, RsvgPrope
     }
 
     if (state->has_stop_opacity) {
-        switch (state->stop_opacity_mode) {
+        switch (state->stop_opacity.kind) {
         case STOP_OPACITY_SPECIFIED:
-            opacity = state->stop_opacity;
+            opacity = state->stop_opacity.opacity;
             break;
 
         case STOP_OPACITY_INHERIT:
-            switch (inherited_state->stop_opacity_mode) {
+            switch (inherited_state->stop_opacity.kind) {
             case STOP_OPACITY_SPECIFIED:
-                opacity = inherited_state->stop_opacity;
+                opacity = inherited_state->stop_opacity.opacity;
                 break;
 
             case STOP_OPACITY_INHERIT:
diff --git a/rsvg-styles.c b/rsvg-styles.c
index dfe4b0d..43cfa1e 100644
--- a/rsvg-styles.c
+++ b/rsvg-styles.c
@@ -113,7 +113,7 @@ rsvg_state_init (RsvgState * state)
      *
      */
     state->stop_color.kind = RSVG_CSS_COLOR_SPEC_INHERIT;
-    state->stop_opacity_mode = STOP_OPACITY_INHERIT;
+    state->stop_opacity.kind = STOP_OPACITY_INHERIT;
 
     state->fill_rule = CAIRO_FILL_RULE_WINDING;
     state->clip_rule = CAIRO_FILL_RULE_WINDING;
@@ -352,9 +352,8 @@ rsvg_state_inherit_run (RsvgState * dst, const RsvgState * src,
         }
     }
     if (function (dst->has_stop_opacity, src->has_stop_opacity)) {
-        if (dst->stop_opacity_mode == STOP_OPACITY_INHERIT) {
+        if (dst->stop_opacity.kind == STOP_OPACITY_INHERIT) {
             dst->stop_opacity = src->stop_opacity;
-            dst->stop_opacity_mode = src->stop_opacity_mode;
         }
     }
     if (function (dst->has_cond, src->has_cond))
@@ -855,10 +854,10 @@ rsvg_parse_style_pair (RsvgState * state,
     } else if (g_str_equal (name, "stop-opacity")) {
         state->has_stop_opacity = TRUE;
         if (g_str_equal (value, "inherit")) {
-            state->stop_opacity_mode = STOP_OPACITY_INHERIT;
+            state->stop_opacity.kind = STOP_OPACITY_INHERIT;
         } else {
-            state->stop_opacity = rsvg_css_parse_opacity (value);
-            state->stop_opacity_mode = STOP_OPACITY_SPECIFIED;
+            state->stop_opacity.kind = STOP_OPACITY_SPECIFIED;
+            state->stop_opacity.opacity = rsvg_css_parse_opacity (value);
         }
     } else if (g_str_equal (name, "marker-start")) {
         g_free (state->startMarker);
diff --git a/rsvg-styles.h b/rsvg-styles.h
index 320d383..3b62fa3 100644
--- a/rsvg-styles.h
+++ b/rsvg-styles.h
@@ -73,8 +73,13 @@ struct _RsvgVpathDash {
 };
 
 typedef enum {
-    STOP_OPACITY_SPECIFIED,
-    STOP_OPACITY_INHERIT
+    STOP_OPACITY_INHERIT,
+    STOP_OPACITY_SPECIFIED
+} StopOpacityKind;
+
+typedef struct {
+    StopOpacityKind kind;
+    guint8 opacity; /* 0..255; only valid if kind == STOP_OPACITY_SPECIFIED */
 } StopOpacity;
 
 /* end libart theft... */
@@ -146,11 +151,11 @@ struct _RsvgState {
 
     guint text_offset;
 
-    RsvgCssColorSpec stop_color;         /* rgb */
+    RsvgCssColorSpec stop_color;
     gboolean has_stop_color;
-    gint stop_opacity;          /* 0..255 */
+
+    StopOpacity stop_opacity;
     gboolean has_stop_opacity;
-    StopOpacity stop_opacity_mode;
 
     gboolean visible;
     gboolean has_visible;