From da18a5675b3107c9bf99e228d85619d247fa19a6 Mon Sep 17 00:00:00 2001
From: =?utf8?q?S=C3=B8ren=20Sandmann=20Pedersen?= <sandmann@daimi.au.dk>
Date: Sun, 7 Sep 2008 00:13:10 -0400
Subject: [PATCH] Extend clip-test to demonstrate a bug in source clipping

---
 test/clip-test.c | 64 +++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 45 insertions(+), 19 deletions(-)

diff --git a/test/clip-test.c b/test/clip-test.c
index a52181f..457e97a 100644
--- a/test/clip-test.c
+++ b/test/clip-test.c
@@ -50,13 +50,13 @@ on_expose (GtkWidget *widget, GdkEventExpose *expose, gpointer data)
 }
 
 static void
-show_window (uint32_t *bits, int w, int h, int stride)
+show_window (pixman_image_t *img, int w, int h, int stride)
 {
     GdkPixbuf *pixbuf;
     
     GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
     
-    pixbuf = pixbuf_from_argb32 (bits, w, h, stride);
+    pixbuf = pixbuf_from_argb32 (pixman_image_get_data (img), w, h, stride);
     
     g_signal_connect (window, "expose_event", G_CALLBACK (on_expose), pixbuf);
     g_signal_connect (window, "delete_event", G_CALLBACK (gtk_main_quit), NULL);
@@ -66,16 +66,29 @@ show_window (uint32_t *bits, int w, int h, int stride)
     gtk_main ();
 }
 
-int
-main (int argc, char **argv)
-{
 #define WIDTH 200
 #define HEIGHT 200
     
-    uint32_t *src = malloc (WIDTH * HEIGHT * 4);
-    pixman_image_t *gradient_img;
-    pixman_image_t *src_img;
+static pixman_image_t *
+create_solid_bits (uint32_t pixel)
+{
+    uint32_t *pixels = malloc (WIDTH * HEIGHT * 4);
     int i;
+    
+    for (i = 0; i < WIDTH * HEIGHT; ++i)
+	pixels[i] = pixel;
+
+    return pixman_image_create_bits (PIXMAN_a8r8g8b8,
+				     WIDTH, HEIGHT, 
+				     pixels,
+				     WIDTH * 4);
+}
+
+int
+main (int argc, char **argv)
+{
+    pixman_image_t *gradient_img;
+    pixman_image_t *src_img, *dst_img;
     pixman_gradient_stop_t stops[2] =
 	{
 	    { pixman_int_to_fixed (0), { 0xffff, 0x0000, 0x0000, 0xffff } },
@@ -88,16 +101,17 @@ main (int argc, char **argv)
     pixman_point_fixed_t c_outer;
     pixman_fixed_t r_inner;
     pixman_fixed_t r_outer;
+    pixman_region32_t clip_region;
+    pixman_transform_t trans = {
+	{ { pixman_double_to_fixed (1.3), pixman_double_to_fixed (0), pixman_double_to_fixed (-0.5), },
+	  { pixman_double_to_fixed (0), pixman_double_to_fixed (1), pixman_double_to_fixed (-0.5), },
+	  { pixman_double_to_fixed (0), pixman_double_to_fixed (0), pixman_double_to_fixed (1.0) } 
+	}
+    };
     
     gtk_init (&argc, &argv);
     
-    for (i = 0; i < WIDTH * HEIGHT; ++i)
-	src[i] = 0xFF0000ff; /* pale blue */
-    
-    src_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
-					 WIDTH, HEIGHT, 
-					 src,
-					 WIDTH * 4);
+    src_img = create_solid_bits (0xff0000ff);
     
     c_inner.x = pixman_double_to_fixed (100.0);
     c_inner.y = pixman_double_to_fixed (100.0);
@@ -109,25 +123,37 @@ main (int argc, char **argv)
     gradient_img = pixman_image_create_radial_gradient (&c_inner, &c_outer,
 							r_inner, r_outer,
 							stops, 2);
-    
+
 #if 0
     gradient_img = pixman_image_create_linear_gradient  (&p1, &p2,
 							 stops, 2);
     
 #endif
-    
+
     pixman_image_composite (PIXMAN_OP_OVER, gradient_img, NULL, src_img,
 			    0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
     
+    pixman_region32_init_rect (&clip_region, 50, 0, 100, 200);
+    pixman_image_set_clip_region32 (src_img, &clip_region);
+    pixman_image_set_source_clipping (src_img, TRUE);
+    pixman_image_set_transform (src_img, &trans);
+    pixman_image_set_repeat (src_img, PIXMAN_REPEAT_NORMAL);
+    
+    dst_img = create_solid_bits (0xffff0000);
+    pixman_image_composite (PIXMAN_OP_OVER, src_img, NULL, dst_img,
+			    0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
+    
+
+#if 0
     printf ("0, 0: %x\n", src[0]);
     printf ("10, 10: %x\n", src[10 * 10 + 10]);
     printf ("w, h: %x\n", src[(HEIGHT - 1) * 100 + (WIDTH - 1)]);
+#endif
     
-    show_window (src, WIDTH, HEIGHT, WIDTH);
+    show_window (dst_img, WIDTH, HEIGHT, WIDTH);
     
     pixman_image_unref (gradient_img);
     pixman_image_unref (src_img);
-    free (src);
     
     return 0;
 }
-- 
2.7.4