[gtk+] Make the recoloring code more robust

[Matthias Clasen <matthiasc src gnome org>]

commit 1da7dc890cdad9ebb1074389aa9ac24b83766e23
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 7 21:27:38 2017 -0500

    Make the recoloring code more robust
    
    Pass both width+height and scale, so we can handle the case
    where width+height are zero and we are using the file, scaled.

 gtk/encodesymbolic.c        |    2 +-
 gtk/gdkpixbufutils.c        |   31 ++++++++++++++++++++++---------
 gtk/gdkpixbufutilsprivate.h |    3 +++
 gtk/gtkicontheme.c          |    2 ++
 4 files changed, 28 insertions(+), 10 deletions(-)
---
diff --git a/gtk/encodesymbolic.c b/gtk/encodesymbolic.c
index 81493f8..7f94f30 100644
--- a/gtk/encodesymbolic.c
+++ b/gtk/encodesymbolic.c
@@ -104,7 +104,7 @@ main (int argc, char **argv)
       return 1;
     }
 
-  symbolic = gtk_make_symbolic_pixbuf_from_data (data, len, width, height, &error);
+  symbolic = gtk_make_symbolic_pixbuf_from_data (data, len, width, height, 1.0, &error);
   if (symbolic == NULL)
     {
       g_printerr (_("Can’t load file: %s\n"), error->message);
diff --git a/gtk/gdkpixbufutils.c b/gtk/gdkpixbufutils.c
index ac9863a..ae57455 100644
--- a/gtk/gdkpixbufutils.c
+++ b/gtk/gdkpixbufutils.c
@@ -136,6 +136,7 @@ load_symbolic_svg (const char     *file_data,
                    gsize           file_len,
                    int             width,
                    int             height,
+                   double          scale,
                    const GdkRGBA  *fg,
                    const GdkRGBA  *success_color,
                    const GdkRGBA  *warning_color,
@@ -168,8 +169,13 @@ load_symbolic_svg (const char     *file_data,
   if (!pixbuf)
     return NULL;
 
+  if (width == 0)
+    width = gdk_pixbuf_get_width (pixbuf) * scale;
+  if (height == 0)
+    height = gdk_pixbuf_get_height (pixbuf) * scale;
+
   svg_width = g_strdup_printf ("%d", gdk_pixbuf_get_width (pixbuf));
-  svg_height = g_strdup_printf ("%d",gdk_pixbuf_get_height (pixbuf));
+  svg_height = g_strdup_printf ("%d", gdk_pixbuf_get_height (pixbuf));
   g_object_unref (pixbuf);
 
   escaped_file_data = g_markup_escape_text (file_data, file_len);
@@ -253,18 +259,15 @@ gtk_make_symbolic_pixbuf_from_data (const char  *file_data,
                                     gsize        file_len,
                                     int          width,
                                     int          height,
+                                    double       scale,
                                     GError     **error)
 
 {
   GdkRGBA r = { 1,0,0,1}, g = {0,1,0,1};
   GdkPixbuf *loaded;
-  GdkPixbuf *pixbuf;
+  GdkPixbuf *pixbuf = NULL;
   int plane;
 
-  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
-
-  gdk_pixbuf_fill (pixbuf, 0);
-
   for (plane = 0; plane < 3; plane++)
     {
       /* Here we render the svg with all colors solid, this should
@@ -279,7 +282,7 @@ gtk_make_symbolic_pixbuf_from_data (const char  *file_data,
        * channels, with the color of the fg being implicitly
        * the "rest", as all color fractions should add up to 1.
        */
-      loaded = load_symbolic_svg (file_data, file_len, width, height,
+      loaded = load_symbolic_svg (file_data, file_len, width, height, scale,
                                   &g,
                                   plane == 0 ? &r : &g,
                                   plane == 1 ? &r : &g,
@@ -288,6 +291,14 @@ gtk_make_symbolic_pixbuf_from_data (const char  *file_data,
       if (loaded == NULL)
         return NULL;
 
+      if (pixbuf == NULL)
+        {
+          pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
+                                   gdk_pixbuf_get_width (loaded),
+                                   gdk_pixbuf_get_height (loaded));
+          gdk_pixbuf_fill (pixbuf, 0);
+        }
+
       if (plane == 0)
         extract_plane (loaded, pixbuf, 3, 3);
 
@@ -303,6 +314,7 @@ GdkPixbuf *
 gtk_make_symbolic_pixbuf_from_resource (const char  *path,
                                         int          width,
                                         int          height,
+                                        double       scale,
                                         GError     **error)
 {
   GBytes *bytes;
@@ -316,7 +328,7 @@ gtk_make_symbolic_pixbuf_from_resource (const char  *path,
 
   data = g_bytes_get_data (bytes, &size);
 
-  pixbuf = gtk_make_symbolic_pixbuf_from_data (data, size, width, height, error);
+  pixbuf = gtk_make_symbolic_pixbuf_from_data (data, size, width, height, scale, error);
 
   g_bytes_unref (bytes);
 
@@ -327,6 +339,7 @@ GdkPixbuf *
 gtk_make_symbolic_pixbuf_from_file (GFile   *file,
                                     int      width,
                                     int      height,
+                                    double   scale,
                                     GError **error)
 {
   char *data;
@@ -336,7 +349,7 @@ gtk_make_symbolic_pixbuf_from_file (GFile   *file,
   if (!g_file_load_contents (file, NULL, &data, &size, NULL, error))
     return NULL;
 
-  pixbuf = gtk_make_symbolic_pixbuf_from_data (data, size, width, height, error);
+  pixbuf = gtk_make_symbolic_pixbuf_from_data (data, size, width, height, scale, error);
 
   g_free (data);
 
diff --git a/gtk/gdkpixbufutilsprivate.h b/gtk/gdkpixbufutilsprivate.h
index 1ea23dc..8e398e1 100644
--- a/gtk/gdkpixbufutilsprivate.h
+++ b/gtk/gdkpixbufutilsprivate.h
@@ -34,14 +34,17 @@ GdkPixbuf *gtk_make_symbolic_pixbuf_from_data     (const char    *data,
                                                    gsize          len,
                                                    int            width,
                                                    int            height,
+                                                   double         scale,
                                                    GError       **error);
 GdkPixbuf *gtk_make_symbolic_pixbuf_from_file     (GFile         *file,
                                                    int            width,
                                                    int            height,
+                                                   double         scale,
                                                    GError       **error);
 GdkPixbuf *gtk_make_symbolic_pixbuf_from_resource (const char    *path,
                                                    int            width,
                                                    int            height,
+                                                   double         scale,
                                                    GError       **error);
 G_END_DECLS
 
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index 94e0323..a6af4f4 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -3796,6 +3796,7 @@ icon_info_ensure_scale_and_pixbuf (GtkIconInfo *icon_info)
           if (gtk_icon_info_is_symbolic (icon_info))
             source_pixbuf = gtk_make_symbolic_pixbuf_from_resource (icon_info->filename,
                                                                     size, size,
+                                                                    icon_info->desired_scale,
                                                                     &icon_info->load_error);
           else if (size == 0)
             source_pixbuf = _gdk_pixbuf_new_from_resource_scaled (icon_info->filename,
@@ -3836,6 +3837,7 @@ icon_info_ensure_scale_and_pixbuf (GtkIconInfo *icon_info)
               if (gtk_icon_info_is_symbolic (icon_info) && icon_info->icon_file)
                 source_pixbuf = gtk_make_symbolic_pixbuf_from_file (icon_info->icon_file,
                                                                     size, size,
+                                                                    icon_info->desired_scale,
                                                                     &icon_info->load_error);
               else if (size == 0)
                 source_pixbuf = _gdk_pixbuf_new_from_stream_scaled (stream,