moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 336 insertions, 0 deletions

diff --git a/src/ui/testgradient.c b/src/ui/testgradient.c
new file mode 100644
index 00000000..fd1b09c7
--- /dev/null
+++ b/src/ui/testgradient.c
@@ -0,0 +1,336 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/* Marco gradient test program */
+
+/* 
+ * Copyright (C) 2002 Havoc Pennington
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.  */
+
+#include "gradient.h"
+#include <gtk/gtk.h>
+
+typedef void (* RenderGradientFunc) (GdkDrawable *drawable,
+                                     cairo_t     *cr,
+                                     int          width,
+                                     int          height);
+
+static void
+draw_checkerboard (GdkDrawable *drawable,
+                   int          width,
+                   int          height)
+{
+  gint i, j, xcount, ycount;
+  GdkColor color1, color2;
+  cairo_t *cr;
+  
+#define CHECK_SIZE 10
+#define SPACING 2  
+  
+  color1.red = 30000;
+  color1.green = 30000;
+  color1.blue = 30000;
+
+  color2.red = 50000;
+  color2.green = 50000;
+  color2.blue = 50000;
+
+  cr = gdk_cairo_create (drawable);
+
+  xcount = 0;
+  i = SPACING;
+  while (i < width)
+    {
+      j = SPACING;
+      ycount = xcount % 2; /* start with even/odd depending on row */
+      while (j < height)
+	{
+	  if (ycount % 2)
+	    gdk_cairo_set_source_color (cr, &color1);
+	  else
+	    gdk_cairo_set_source_color (cr, &color2);
+
+	  /* If we're outside event->area, this will do nothing.
+	   * It might be mildly more efficient if we handled
+	   * the clipping ourselves, but again we're feeling lazy.
+	   */
+          cairo_rectangle (cr, i, j, CHECK_SIZE, CHECK_SIZE);
+          cairo_fill (cr);
+
+	  j += CHECK_SIZE + SPACING;
+	  ++ycount;
+	}
+
+      i += CHECK_SIZE + SPACING;
+      ++xcount;
+    }
+  
+  cairo_destroy (cr);
+}
+
+static void
+render_simple (GdkDrawable *drawable,
+               cairo_t     *cr,
+               int width, int height,
+               MetaGradientType type,
+               gboolean    with_alpha)
+{
+  GdkPixbuf *pixbuf;
+  GdkColor from, to;
+  
+  gdk_color_parse ("blue", &from);
+  gdk_color_parse ("green", &to);
+
+  pixbuf = meta_gradient_create_simple (width, height,
+                                        &from, &to,
+                                        type);
+
+  if (with_alpha)
+    {
+      const unsigned char alphas[] = { 0xff, 0xaa, 0x2f, 0x0, 0xcc, 0xff, 0xff };
+      
+      if (!gdk_pixbuf_get_has_alpha (pixbuf))
+        {
+          GdkPixbuf *new_pixbuf;
+          
+          new_pixbuf = gdk_pixbuf_add_alpha (pixbuf, FALSE, 0, 0, 0);
+          g_object_unref (G_OBJECT (pixbuf));
+          pixbuf = new_pixbuf;
+        }
+      
+      meta_gradient_add_alpha (pixbuf,
+                               alphas, G_N_ELEMENTS (alphas),
+                               META_GRADIENT_HORIZONTAL);
+      
+      draw_checkerboard (drawable, width, height);
+    }
+    
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  cairo_rectangle (cr, 0, 0, width, height);
+  cairo_fill (cr);
+
+  g_object_unref (G_OBJECT (pixbuf));
+}
+
+static void
+render_vertical_func (GdkDrawable *drawable,
+                      cairo_t *cr,
+                      int width, int height)
+{
+  render_simple (drawable, cr, width, height, META_GRADIENT_VERTICAL, FALSE);
+}
+
+static void
+render_horizontal_func (GdkDrawable *drawable,
+                        cairo_t *cr,
+                        int width, int height)
+{
+  render_simple (drawable, cr, width, height, META_GRADIENT_HORIZONTAL, FALSE);
+}
+
+static void
+render_diagonal_func (GdkDrawable *drawable,
+                      cairo_t *cr,
+                      int width, int height)
+{
+  render_simple (drawable, cr, width, height, META_GRADIENT_DIAGONAL, FALSE);
+}
+
+static void
+render_diagonal_alpha_func (GdkDrawable *drawable,
+                            cairo_t *cr,
+                            int width, int height)
+{
+  render_simple (drawable, cr, width, height, META_GRADIENT_DIAGONAL, TRUE);
+}
+
+static void
+render_multi (GdkDrawable *drawable,
+              cairo_t     *cr,
+              int width, int height,
+              MetaGradientType type)
+{
+  GdkPixbuf *pixbuf;
+#define N_COLORS 5
+  GdkColor colors[N_COLORS];
+
+  gdk_color_parse ("red", &colors[0]);
+  gdk_color_parse ("blue", &colors[1]);
+  gdk_color_parse ("orange", &colors[2]);
+  gdk_color_parse ("pink", &colors[3]);
+  gdk_color_parse ("green", &colors[4]);
+
+  pixbuf = meta_gradient_create_multi (width, height,
+                                       colors, N_COLORS,
+                                       type);
+
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  cairo_rectangle (cr, 0, 0, width, height);
+  cairo_fill (cr);
+
+  g_object_unref (G_OBJECT (pixbuf));
+#undef N_COLORS
+}
+
+static void
+render_vertical_multi_func (GdkDrawable *drawable,
+                            cairo_t *cr,
+                            int width, int height)
+{
+  render_multi (drawable, cr, width, height, META_GRADIENT_VERTICAL);
+}
+
+static void
+render_horizontal_multi_func (GdkDrawable *drawable,
+                              cairo_t *cr,
+                              int width, int height)
+{
+  render_multi (drawable, cr, width, height, META_GRADIENT_HORIZONTAL);
+}
+
+static void
+render_diagonal_multi_func (GdkDrawable *drawable,
+                            cairo_t *cr,
+                            int width, int height)
+{
+  render_multi (drawable, cr, width, height, META_GRADIENT_DIAGONAL);
+}
+
+static void
+render_interwoven_func (GdkDrawable *drawable,
+                        cairo_t     *cr,
+                        int width, int height)
+{
+  GdkPixbuf *pixbuf;
+#define N_COLORS 4
+  GdkColor colors[N_COLORS];
+
+  gdk_color_parse ("red", &colors[0]);
+  gdk_color_parse ("blue", &colors[1]);
+  gdk_color_parse ("pink", &colors[2]);
+  gdk_color_parse ("green", &colors[3]);
+
+  pixbuf = meta_gradient_create_interwoven (width, height,
+                                            colors, height / 10,
+                                            colors + 2, height / 14);
+
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  cairo_rectangle (cr, 0, 0, width, height);
+  cairo_fill (cr);
+
+  g_object_unref (G_OBJECT (pixbuf));
+}
+
+static gboolean
+expose_callback (GtkWidget *widget,
+                 GdkEventExpose *event,
+                 gpointer data)
+{
+  RenderGradientFunc func = data;
+  GdkWindow *window;
+  GtkAllocation allocation;
+  GtkStyle *style;
+  cairo_t *cr;
+
+  style = gtk_widget_get_style (widget);
+  gtk_widget_get_allocation (widget, &allocation);
+
+  window = gtk_widget_get_window (widget);
+  cr = gdk_cairo_create (window);
+  gdk_cairo_set_source_color (cr, &style->fg[gtk_widget_get_state (widget)]);
+
+  (* func) (window,
+            cr,
+            allocation.width,
+            allocation.height);
+
+  cairo_destroy (cr);
+
+  return TRUE;
+}
+
+static GtkWidget*
+create_gradient_window (const char *title,
+                        RenderGradientFunc func)
+{
+  GtkWidget *window;
+  GtkWidget *drawing_area;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+
+  gtk_window_set_title (GTK_WINDOW (window), title);
+  
+  drawing_area = gtk_drawing_area_new ();
+
+  gtk_widget_set_size_request (drawing_area, 1, 1);
+
+  gtk_window_set_default_size (GTK_WINDOW (window), 175, 175);
+  
+  g_signal_connect (G_OBJECT (drawing_area),
+                    "expose_event",
+                    G_CALLBACK (expose_callback),
+                    func);
+
+  gtk_container_add (GTK_CONTAINER (window), drawing_area);
+
+  gtk_widget_show_all (window);
+  
+  return window;
+}
+
+static void
+meta_gradient_test (void)
+{
+  GtkWidget *window;
+
+  window = create_gradient_window ("Simple vertical",
+                                   render_vertical_func);
+  
+  window = create_gradient_window ("Simple horizontal",
+                                   render_horizontal_func);
+
+  window = create_gradient_window ("Simple diagonal",
+                                   render_diagonal_func);
+
+  window = create_gradient_window ("Multi vertical",
+                                   render_vertical_multi_func);
+  
+  window = create_gradient_window ("Multi horizontal",
+                                   render_horizontal_multi_func);
+
+  window = create_gradient_window ("Multi diagonal",
+                                   render_diagonal_multi_func);
+
+  window = create_gradient_window ("Interwoven",
+                                   render_interwoven_func);
+
+  window = create_gradient_window ("Simple diagonal with horizontal multi alpha",
+                                   render_diagonal_alpha_func);
+
+}
+
+int
+main (int argc, char **argv)
+{
+  gtk_init (&argc, &argv);
+
+  meta_gradient_test ();
+
+  gtk_main ();
+
+  return 0;
+}
+