Add a1-trap-test

When a trapezoid sample point is exactly on a polygon edge, the rule
is that it is considered inside the trapezoid if the edge is a top or
left edge, but outside for bottom and right edges.

This program tests that for a1 trapezoids.

2 files changed, 52 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index 3229f96..841ff8d 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -2,6 +2,7 @@ TEST_LDADD = $(top_builddir)/pixman/libpixman-1.la
 INCLUDES = -I$(top_srcdir)/pixman -I$(top_builddir)/pixman
 
 TESTPROGRAMS =			\
+	a1-trap-test		\
 	region-test		\
 	fetch-test		\
 	oob-test		\
@@ -12,6 +13,7 @@ TESTPROGRAMS =			\
 	scaling-test		\
 	composite
 
+a1_trap_test_LDADD = $(TEST_LDADD)
 fetch_test_LDADD = $(TEST_LDADD)
 composite_LDADD = $(TEST_LDADD)
 trap_crasher_LDADD = $(TEST_LDADD)
diff --git a/test/a1-trap-test.c b/test/a1-trap-test.c
new file mode 100644
index 0000000..6163e7c
--- /dev/null
+++ b/test/a1-trap-test.c
@@ -0,0 +1,50 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "pixman.h"
+
+int
+main (int argc, char **argv)
+{
+#define WIDTH 20
+#define HEIGHT 20
+
+    pixman_image_t *src_img;
+    pixman_image_t *mask_img;
+    pixman_image_t *dest_img;
+    pixman_trap_t trap;
+    pixman_color_t red = { 0xffff, 0x0000, 0x0000, 0xffff };
+    uint32_t *bits = malloc (WIDTH * HEIGHT * 4);
+    uint32_t *mbits = malloc (WIDTH * HEIGHT);
+
+    memset (mbits, 0, WIDTH * HEIGHT);
+    memset (bits, 0xff, WIDTH * HEIGHT * 4);
+    
+    trap.top.l = pixman_double_to_fixed (0.5);
+    trap.top.r = pixman_double_to_fixed (1.5);
+    trap.top.y = pixman_double_to_fixed (0.5);
+
+    trap.bot.l = pixman_double_to_fixed (0.5);
+    trap.bot.r = pixman_double_to_fixed (1.5);
+    trap.bot.y = pixman_double_to_fixed (1.5);
+
+    mask_img = pixman_image_create_bits (
+	PIXMAN_a1, WIDTH, HEIGHT, mbits, WIDTH);
+    src_img = pixman_image_create_solid_fill (&red);
+    dest_img = pixman_image_create_bits (
+	PIXMAN_a8r8g8b8, WIDTH, HEIGHT, bits, WIDTH * 4);
+    
+    pixman_add_traps (mask_img, 0, 0, 1, &trap);
+
+    pixman_image_composite (PIXMAN_OP_OVER,
+			    src_img, mask_img, dest_img,
+			    0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
+
+    assert (bits[0] == 0xffff0000);
+    assert (bits[1] == 0xffffffff);
+    assert (bits[1 * WIDTH + 0] == 0xffffffff);
+    assert (bits[1 * WIDTH + 1] == 0xffffffff);
+    
+    return 0;
+}