Migrate more functions from MathUtil to gfx::Transform

ui/gfx/transform_util.cc

Index: ui/gfx/transform_util.cc
diff --git a/ui/gfx/transform_util.cc b/ui/gfx/transform_util.cc
index c8ef5736d3e4b51103ff0c73a4d1f82496a74ef2..268aa3862c733525a7de4a4433a0cf036da8bfc3 100644
--- a/ui/gfx/transform_util.cc
+++ b/ui/gfx/transform_util.cc
@@ -315,4 +315,74 @@ Transform ComposeTransform(const DecomposedTransform& decomp) {
   return to_return;
 }
 
+Transform CreateGfxTransform(
+    double col1row1, double col1row2, double col1row3, double col1row4,
+    double col2row1, double col2row2, double col2row3, double col2row4,
+    double col3row1, double col3row2, double col3row3, double col3row4,
+    double col4row1, double col4row2, double col4row3, double col4row4)
+{
+  Transform result(Transform::kSkipInitialization);
+  SkMatrix44& matrix = result.matrix();
+
+  // Initialize column 1
+  matrix.setDouble(0, 0, col1row1);
+  matrix.setDouble(1, 0, col1row2);
+  matrix.setDouble(2, 0, col1row3);
+  matrix.setDouble(3, 0, col1row4);
+
+  // Initialize column 2
+  matrix.setDouble(0, 1, col2row1);
+  matrix.setDouble(1, 1, col2row2);
+  matrix.setDouble(2, 1, col2row3);
+  matrix.setDouble(3, 1, col2row4);
+
+  // Initialize column 3
+  matrix.setDouble(0, 2, col3row1);
+  matrix.setDouble(1, 2, col3row2);
+  matrix.setDouble(2, 2, col3row3);
+  matrix.setDouble(3, 2, col3row4);
+
+  // Initialize column 4
+  matrix.setDouble(0, 3, col4row1);
+  matrix.setDouble(1, 3, col4row2);
+  matrix.setDouble(2, 3, col4row3);
+  matrix.setDouble(3, 3, col4row4);
+
+  return result;
+}
+
+Transform CreateGfxTransform(
+    double col1row1, double col1row2, double col2row1,
+    double col2row2, double x_translation, double y_translation)
+{
+    gfx::Transform result;
+    SkMatrix44& matrix = result.matrix();
+    matrix.setDouble(0, 0, col1row1);
+    matrix.setDouble(1, 0, col1row2);
+    matrix.setDouble(0, 1, col2row1);
+    matrix.setDouble(1, 1, col2row2);
+    matrix.setDouble(0, 3, x_translation);
+    matrix.setDouble(1, 3, y_translation);
+
+    return result;
+}
+
+void FlattenTransformTo2d(Transform& transform) {
+  // Set both the 3rd row and 3rd column to (0, 0, 1, 0).
+  transform.matrix().setDouble(2, 0, 0);
+  transform.matrix().setDouble(2, 1, 0);
+  transform.matrix().setDouble(0, 2, 0);
+  transform.matrix().setDouble(1, 2, 0);
+  transform.matrix().setDouble(2, 2, 1);
+  transform.matrix().setDouble(3, 2, 0);
+  transform.matrix().setDouble(2, 3, 0);
+}
+
+// Constructs a flattened version of the given transform.
+Transform CreateFlattenedTransform(const Transform& transform) {
+  Transform result = transform;
+  FlattenTransformTo2d(result);
+  return result;
+}
+
 }  // namespace ui