update the nearly_integral calculation to be (a) faster, and (b) to correctly
identify that the AA granularity is 1/4 of a pixel, not 1/16 (along an axis).
git-svn-id: http://skia.googlecode.com/svn/trunk@3919 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/AAClipTest.cpp b/tests/AAClipTest.cpp
index 2898f30..bf52b01 100644
--- a/tests/AAClipTest.cpp
+++ b/tests/AAClipTest.cpp
@@ -316,6 +316,67 @@
}
}
+#include "SkRasterClip.h"
+
+static void copyToMask(const SkRasterClip& rc, SkMask* mask) {
+ if (rc.isAA()) {
+ rc.aaRgn().copyToMask(mask);
+ } else {
+ copyToMask(rc.bwRgn(), mask);
+ }
+}
+
+static bool operator==(const SkRasterClip& a, const SkRasterClip& b) {
+ if (a.isEmpty()) {
+ return b.isEmpty();
+ }
+ if (b.isEmpty()) {
+ return false;
+ }
+
+ SkMask ma, mb;
+ copyToMask(a, &ma);
+ copyToMask(b, &mb);
+ return ma == mb;
+}
+
+static void did_dx_affect(skiatest::Reporter* reporter, const SkScalar dx[],
+ size_t count, bool changed) {
+ SkIRect ir = { 0, 0, 10, 10 };
+
+ for (size_t i = 0; i < count; ++i) {
+ SkRect r;
+ r.set(ir);
+
+ SkRasterClip rc0(ir);
+ SkRasterClip rc1(ir);
+ SkRasterClip rc2(ir);
+
+ rc0.op(r, SkRegion::kIntersect_Op, false);
+ r.offset(dx[i], 0);
+ rc1.op(r, SkRegion::kIntersect_Op, true);
+ r.offset(-2*dx[i], 0);
+ rc2.op(r, SkRegion::kIntersect_Op, true);
+
+ REPORTER_ASSERT(reporter, changed != (rc0 == rc1));
+ REPORTER_ASSERT(reporter, changed != (rc0 == rc2));
+ }
+}
+
+static void test_nearly_integral(skiatest::Reporter* reporter) {
+ // All of these should generate equivalent rasterclips
+
+ static const SkScalar gSafeX[] = {
+ 0, SK_Scalar1/1000, SK_Scalar1/100, SK_Scalar1/10,
+ };
+ did_dx_affect(reporter, gSafeX, SK_ARRAY_COUNT(gSafeX), false);
+
+ static const SkScalar gUnsafeX[] = {
+ SK_Scalar1/4, SK_Scalar1/3,
+ };
+ did_dx_affect(reporter, gUnsafeX, SK_ARRAY_COUNT(gUnsafeX), true);
+}
+
static void test_regressions(skiatest::Reporter* reporter) {
// these should not assert in the debug build
// bug was introduced in rev. 3209
@@ -337,6 +398,7 @@
test_rgn(reporter);
test_path_with_hole(reporter);
test_regressions(reporter);
+ test_nearly_integral(reporter);
}
#include "TestClassDef.h"