Add option to skip rects to drawImageLattice()

gm/lattice.cpp

Index: gm/lattice.cpp
diff --git a/gm/lattice.cpp b/gm/lattice.cpp
index 63de2a66b407d6d2d2adbf6d549a24d06d1930ea..b3616fc66e9861503729b14fabc671dfb0a11691 100644
--- a/gm/lattice.cpp
+++ b/gm/lattice.cpp
@@ -113,6 +113,8 @@ protected:
         lattice.fXDivs = xDivs + 1;
         lattice.fYCount = 4;
         lattice.fYDivs = yDivs + 1;
+        lattice.fFlags = nullptr;
+        lattice.fFlagCount = 0;
 
         for (int iy = 0; iy < 2; ++iy) {
             for (int ix = 0; ix < 2; ++ix) {
@@ -130,6 +132,15 @@ protected:
         lattice.fYCount = 5;
         lattice.fYDivs = yDivs;
 
+        // Let's skip a few rects.
+        SkCanvas::Lattice::Flags flags[25];
+        sk_bzero(flags, 25 * sizeof(SkCanvas::Lattice::Flags));
+        flags[4] = SkCanvas::Lattice::kSkip_Flags;
+        flags[9] = SkCanvas::Lattice::kSkip_Flags;
+        flags[12] = SkCanvas::Lattice::kSkip_Flags;
+        lattice.fFlags = flags;
+        lattice.fFlagCount = 25;
+
         canvas->translate(400, 0);
         for (int iy = 0; iy < 2; ++iy) {
             for (int ix = 0; ix < 2; ++ix) {