Merge branch 'master' into treeview-refactor

Conflicts:
	gtk/gtkmarshalers.list
	tests/Makefile.am

1 files changed, 282 insertions, 0 deletions

diff --git a/gtk/gtkgradient.c b/gtk/gtkgradient.c
new file mode 100644
index 0000000000..a19b8fe583
--- /dev/null
+++ b/gtk/gtkgradient.c
@@ -0,0 +1,282 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gtkgradient.h"
+#include "gtkstyleproperties.h"
+#include "gtkintl.h"
+
+/**
+ * SECTION:gtkgradient
+ * @Short_description: Gradients
+ * @Title: GtkGradient
+ *
+ * GtkGradient is a boxed type that represents a gradient.
+ * It is the result of parsing a
+ * <link linkend="gtkcssprovider-gradients">gradient expression</link>.
+ * To obtain the gradient represented by a GtkGradient, it has to
+ * be resolved with gtk_gradient_resolve(), which replaces all
+ * symbolic color references by the colors they refer to (in a given
+ * context) and constructs a #cairo_pattern_t value.
+ *
+ * It is not normally necessary to deal directly with #GtkGradients,
+ * since they are mostly used behind the scenes by #GtkStyleContext and
+ * #GtkCssProvider.
+ */
+
+G_DEFINE_BOXED_TYPE (GtkGradient, gtk_gradient,
+                     gtk_gradient_ref, gtk_gradient_unref)
+
+typedef struct ColorStop ColorStop;
+
+struct ColorStop
+{
+  gdouble offset;
+  GtkSymbolicColor *color;
+};
+
+struct _GtkGradient
+{
+  gdouble x0;
+  gdouble y0;
+  gdouble x1;
+  gdouble y1;
+  gdouble radius0;
+  gdouble radius1;
+
+  GArray *stops;
+
+  guint ref_count;
+};
+
+/**
+ * gtk_gradient_new_linear:
+ * @x0: X coordinate of the starting point
+ * @y0: Y coordinate of the starting point
+ * @x1: X coordinate of the end point
+ * @y1: Y coordinate of the end point
+ *
+ * Creates a new linear gradient along the line defined by (x0, y0) and (x1, y1). Before using the gradient
+ * a number of stop colors must be added through gtk_gradient_add_color_stop().
+ *
+ * Returns: A newly created #GtkGradient
+ *
+ * Since: 3.0
+ **/
+GtkGradient *
+gtk_gradient_new_linear (gdouble x0,
+                         gdouble y0,
+                         gdouble x1,
+                         gdouble y1)
+{
+  GtkGradient *gradient;
+
+  gradient = g_slice_new (GtkGradient);
+  gradient->stops = g_array_new (FALSE, FALSE, sizeof (ColorStop));
+
+  gradient->x0 = x0;
+  gradient->y0 = y0;
+  gradient->x1 = x1;
+  gradient->y1 = y1;
+  gradient->radius0 = 0;
+  gradient->radius1 = 0;
+
+  gradient->ref_count = 1;
+
+  return gradient;
+}
+
+/**
+ * gtk_gradient_new_radial:
+ * @x0: X coordinate of the start circle
+ * @y0: Y coordinate of the start circle
+ * @radius0: radius of the start circle
+ * @x1: X coordinate of the end circle
+ * @y1: Y coordinate of the end circle
+ * @radius1: radius of the end circle
+ *
+ * Creates a new radial gradient along the two circles defined by (x0, y0, radius0) and
+ * (x1, y1, radius1). Before using the gradient a number of stop colors must be added
+ * through gtk_gradient_add_color_stop().
+ *
+ * Returns: A newly created #GtkGradient
+ *
+ * Since: 3.0
+ **/
+GtkGradient *
+gtk_gradient_new_radial (gdouble x0,
+			 gdouble y0,
+			 gdouble radius0,
+			 gdouble x1,
+			 gdouble y1,
+			 gdouble radius1)
+{
+  GtkGradient *gradient;
+
+  gradient = g_slice_new (GtkGradient);
+  gradient->stops = g_array_new (FALSE, FALSE, sizeof (ColorStop));
+
+  gradient->x0 = x0;
+  gradient->y0 = y0;
+  gradient->x1 = x1;
+  gradient->y1 = y1;
+  gradient->radius0 = radius0;
+  gradient->radius1 = radius1;
+
+  gradient->ref_count = 1;
+
+  return gradient;
+}
+
+/**
+ * gtk_gradient_add_color_stop:
+ * @gradient: a #GtkGradient
+ * @offset: offset for the color stop
+ * @color: color to use
+ *
+ * Adds a stop color to @gradient.
+ *
+ * Since: 3.0
+ **/
+void
+gtk_gradient_add_color_stop (GtkGradient      *gradient,
+                             gdouble           offset,
+                             GtkSymbolicColor *color)
+{
+  ColorStop stop;
+
+  g_return_if_fail (gradient != NULL);
+
+  stop.offset = offset;
+  stop.color = gtk_symbolic_color_ref (color);
+
+  g_array_append_val (gradient->stops, stop);
+}
+
+/**
+ * gtk_gradient_ref:
+ * @gradient: a #GtkGradient
+ *
+ * Increases the reference count of @gradient.
+ *
+ * Returns: The same @gradient
+ *
+ * Since: 3.0
+ **/
+GtkGradient *
+gtk_gradient_ref (GtkGradient *gradient)
+{
+  g_return_val_if_fail (gradient != NULL, NULL);
+
+  gradient->ref_count++;
+
+  return gradient;
+}
+
+/**
+ * gtk_gradient_unref:
+ * @gradient: a #GtkGradient
+ *
+ * Decreases the reference count of @gradient, freeing its memory
+ * if the reference count reaches 0.
+ *
+ * Since: 3.0
+ **/
+void
+gtk_gradient_unref (GtkGradient *gradient)
+{
+  g_return_if_fail (gradient != NULL);
+
+  gradient->ref_count--;
+
+  if (gradient->ref_count == 0)
+    {
+      guint i;
+
+      for (i = 0; i < gradient->stops->len; i++)
+        {
+          ColorStop *stop;
+
+          stop = &g_array_index (gradient->stops, ColorStop, i);
+          gtk_symbolic_color_unref (stop->color);
+        }
+
+      g_array_free (gradient->stops, TRUE);
+      g_slice_free (GtkGradient, gradient);
+    }
+}
+
+/**
+ * gtk_gradient_resolve:
+ * @gradient: a #GtkGradient
+ * @props: #GtkStyleProperties to use when resolving named colors
+ * @resolved_gradient: (out): return location for the resolved pattern
+ *
+ * If @gradient is resolvable, @resolved_gradient will be filled in
+ * with the resolved gradient as a cairo_pattern_t, and %TRUE will
+ * be returned. Generally, if @gradient can't be resolved, it is
+ * due to it being defined on top of a named color that doesn't
+ * exist in @props.
+ *
+ * Returns: %TRUE if the gradient has been resolved
+ *
+ * Since: 3.0
+ **/
+gboolean
+gtk_gradient_resolve (GtkGradient         *gradient,
+                      GtkStyleProperties  *props,
+                      cairo_pattern_t    **resolved_gradient)
+{
+  cairo_pattern_t *pattern;
+  guint i;
+
+  g_return_val_if_fail (gradient != NULL, FALSE);
+  g_return_val_if_fail (GTK_IS_STYLE_PROPERTIES (props), FALSE);
+  g_return_val_if_fail (resolved_gradient != NULL, FALSE);
+
+  if (gradient->radius0 == 0 && gradient->radius1 == 0)
+    pattern = cairo_pattern_create_linear (gradient->x0, gradient->y0,
+                                           gradient->x1, gradient->y1);
+  else
+    pattern = cairo_pattern_create_radial (gradient->x0, gradient->y0,
+                                           gradient->radius0,
+                                           gradient->x1, gradient->y1,
+                                           gradient->radius1);
+
+  for (i = 0; i < gradient->stops->len; i++)
+    {
+      ColorStop *stop;
+      GdkRGBA color;
+
+      stop = &g_array_index (gradient->stops, ColorStop, i);
+
+      if (!gtk_symbolic_color_resolve (stop->color, props, &color))
+        {
+          cairo_pattern_destroy (pattern);
+          return FALSE;
+        }
+
+      cairo_pattern_add_color_stop_rgba (pattern, stop->offset,
+                                         color.red, color.green,
+                                         color.blue, color.alpha);
+    }
+
+  *resolved_gradient = pattern;
+  return TRUE;
+}