import from UXP: Issue #438: Add an IsRectilinear helper method to gfxMatrix. (0343460b)

2026-05-26 15:02:46 +00:00 · 2022-04-05 14:53:20 +08:00
parent 83df6e0640
commit 3f156149aa
1 changed files with 12 additions and 0 deletions
@@ -112,6 +112,18 @@ public:
              _31 == 0.0 && _32 == 0.0;
    }

+    /* Returns true if the matrix is a rectilinear transformation (i.e.
+     * grid-aligned rectangles are transformed to grid-aligned rectangles)
+     */
+    bool IsRectilinear() const {
+      if (FuzzyEqual(_12, 0) && FuzzyEqual(_21, 0)) {
+        return true;
+      } else if (FuzzyEqual(_22, 0) && FuzzyEqual(_11, 0)) {
+        return true;
+      }
+      return false;
+    }
+
    /**
     * Inverts this matrix, if possible. Otherwise, the matrix is left
     * unchanged.