region: Add a new test region-translate

This test exercises a bug in pixman_region32_translate(). The function
clips the region to int16 coordinates SHRT_MIN/SHRT_MAX.

diff --git a/.gitignore b/.gitignore
index 96d222b..aaeb75f 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,7 @@ test/fetch-test
 test/gradient-test
 test/oob-test
 test/region-test
+test/region-translate
 test/scaling-test
 test/screen-test
 test/trap-crasher

diff --git a/test/Makefile.am b/test/Makefile.am
index 5273bec..3d98e17 100644 (file)
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -7,6 +7,7 @@ INCLUDES = -I$(top_srcdir)/pixman -I$(top_builddir)/pixman
 TESTPROGRAMS =                 \
        a1-trap-test            \
        region-test             \
+       region-translate-test   \
        fetch-test              \
        oob-test                \
        window-test             \
@@ -27,6 +28,7 @@ trap_crasher_LDADD = $(TEST_LDADD)
 oob_test_LDADD = $(TEST_LDADD)
 window_test_LDADD = $(TEST_LDADD)
 scaling_crash_test_LDADD = $(TEST_LDADD)
+region_translate_test_LDADD = $(TEST_LDADD)
 
 region_test_LDADD = $(TEST_LDADD)
 region_test_SOURCES = region-test.c utils.c utils.h

diff --git a/test/region-translate-test.c b/test/region-translate-test.c
new file mode 100644 (file)
index 0000000..0e96a5e
--- /dev/null
+++ b/test/region-translate-test.c
@@ -0,0 +1,30 @@
+#include <pixman.h>
+#include <assert.h>
+
+/* Pixman had a bug where 32bit regions where clipped to 16bit sizes when
+ * pixman_region32_translate() was called. This test exercises that bug.
+ */
+
+#define LARGE 32000
+
+int
+main (int argc, char **argv)
+{
+  pixman_box32_t rect = { -LARGE, -LARGE, LARGE, LARGE };
+  pixman_region32_t r1, r2;
+
+  pixman_region32_init_rects (&r1, &rect, 1);
+  pixman_region32_init_rect (&r2, rect.x1, rect.y1, rect.x2 - rect.x1, rect.y2 - rect.y1);
+
+  assert (pixman_region32_equal (&r1,  &r2));
+
+  pixman_region32_translate (&r1, -LARGE, LARGE);
+  pixman_region32_translate (&r1, LARGE, -LARGE);
+
+  assert (pixman_region32_equal (&r1,  &r2));
+
+  pixman_region32_fini (&r1);
+  pixman_region32_fini (&r2);
+
+  return 0;
+}