fix fragile cubic stepper, where we want to assert that each tesselated segment
is monotonically going down, but the finite math we use cannot ensure that...
so we explicitly pin the y-value after it is calculated.
add unittest that exercises the bug/assert that was found on an SVG site
git-svn-id: http://skia.googlecode.com/svn/trunk@5544 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/PathTest.cpp b/tests/PathTest.cpp
index 50b3583..b9add7a 100644
--- a/tests/PathTest.cpp
+++ b/tests/PathTest.cpp
@@ -6,6 +6,7 @@
* found in the LICENSE file.
*/
#include "Test.h"
+#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkParse.h"
@@ -15,6 +16,38 @@
#include "SkReader32.h"
#include "SkSize.h"
#include "SkWriter32.h"
+#include "SkSurface.h"
+
+static SkSurface* new_surface(int w, int h) {
+ SkImage::Info info = {
+ w, h, SkImage::kPMColor_ColorType, SkImage::kPremul_AlphaType
+ };
+ return SkSurface::NewRaster(info, NULL);
+}
+
+// Inspired by http://ie.microsoft.com/testdrive/Performance/Chalkboard/
+// which triggered an assert, from a tricky cubic. This test replicates that
+// example, so we can ensure that we handle it (in SkEdge.cpp), and don't
+// assert in the SK_DEBUG build.
+static void test_tricky_cubic(skiatest::Reporter* reporter) {
+ const SkPoint pts[] = {
+ { SkDoubleToScalar(18.8943768), SkDoubleToScalar(129.121277) },
+ { SkDoubleToScalar(18.8937435), SkDoubleToScalar(129.121689) },
+ { SkDoubleToScalar(18.8950119), SkDoubleToScalar(129.120422) },
+ { SkDoubleToScalar(18.5030727), SkDoubleToScalar(129.13121) },
+ };
+
+ SkPath path;
+ path.moveTo(pts[0]);
+ path.cubicTo(pts[1], pts[2], pts[3]);
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+
+ SkSurface* surface = new_surface(19, 130);
+ surface->getCanvas()->drawPath(path, paint);
+ surface->unref();
+}
// Inspired by http://code.google.com/p/chromium/issues/detail?id=141651
//
@@ -1590,6 +1623,7 @@
test_addPoly(reporter);
test_isfinite(reporter);
test_isfinite_after_transform(reporter);
+ test_tricky_cubic(reporter);
}
#include "TestClassDef.h"