Add unit tests for CFX_Matrix::TransformRect().

Change-Id: Id4bebae05116422b15019e7b972f5e8594317afe
Reviewed-on: https://pdfium-review.googlesource.com/c/43949
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

2 files changed, 48 insertions, 0 deletions

diff --git a/core/fxcrt/fx_coordinates.h b/core/fxcrt/fx_coordinates.h
index d01191da37..4a63a6ca37 100644
--- a/core/fxcrt/fx_coordinates.h
+++ b/core/fxcrt/fx_coordinates.h
@@ -274,6 +274,10 @@ class CFX_FloatRect {
 
   float Width() const { return right - left; }
   float Height() const { return top - bottom; }
+  float Left() const { return left; }
+  float Bottom() const { return bottom; }
+  float Right() const { return right; }
+  float Top() const { return top; }
 
   void Inflate(float x, float y);
   void Inflate(float other_left,
@@ -426,6 +430,8 @@ class CFX_RectF {
     return rt.left >= left && rt.right() <= right() && rt.top >= top &&
            rt.bottom() <= bottom();
   }
+  float Left() const { return left; }
+  float Top() const { return top; }
   float Width() const { return width; }
   float Height() const { return height; }
   SizeType Size() const { return SizeType(width, height); }
diff --git a/core/fxcrt/fx_coordinates_unittest.cpp b/core/fxcrt/fx_coordinates_unittest.cpp
index b885d07095..3d11748649 100644
--- a/core/fxcrt/fx_coordinates_unittest.cpp
+++ b/core/fxcrt/fx_coordinates_unittest.cpp
@@ -458,3 +458,45 @@ TEST(CFX_Matrix, ComposeTransformations) {
   EXPECT_FLOAT_EQ(-271.0f, p_10_20_transformed.x);
   EXPECT_FLOAT_EQ(73.0f, p_10_20_transformed.y);
 }
+
+TEST(CFX_Matrix, TransformRectForRectF) {
+  CFX_Matrix rotate_90;
+  rotate_90.Rotate(FX_PI / 2);
+
+  CFX_Matrix scale_5_13;
+  scale_5_13.Scale(5, 13);
+
+  CFX_RectF rect(10.5f, 20.5f, 4.25f, 3.25f);
+  rect = rotate_90.TransformRect(rect);
+  EXPECT_FLOAT_EQ(-23.75f, rect.Left());
+  EXPECT_FLOAT_EQ(10.5f, rect.Top());
+  EXPECT_FLOAT_EQ(3.25f, rect.Width());
+  EXPECT_FLOAT_EQ(4.25f, rect.Height());
+
+  rect = scale_5_13.TransformRect(rect);
+  EXPECT_FLOAT_EQ(-118.75f, rect.Left());
+  EXPECT_FLOAT_EQ(136.5f, rect.Top());
+  EXPECT_FLOAT_EQ(16.25f, rect.Width());
+  EXPECT_FLOAT_EQ(55.25f, rect.Height());
+}
+
+TEST(CFX_Matrix, TransformRectForFloatRect) {
+  CFX_Matrix rotate_90;
+  rotate_90.Rotate(FX_PI / 2);
+
+  CFX_Matrix scale_5_13;
+  scale_5_13.Scale(5, 13);
+
+  CFX_FloatRect rect(5.5f, 0.0f, 12.25f, 2.7f);
+  rect = rotate_90.TransformRect(rect);
+  EXPECT_FLOAT_EQ(-2.7f, rect.Left());
+  EXPECT_FLOAT_EQ(5.5f, rect.Bottom());
+  EXPECT_NEAR(0.0f, rect.Right(), 0.00001f);
+  EXPECT_FLOAT_EQ(12.25f, rect.Top());
+
+  rect = scale_5_13.TransformRect(rect);
+  EXPECT_FLOAT_EQ(-13.5f, rect.Left());
+  EXPECT_FLOAT_EQ(71.5f, rect.Bottom());
+  EXPECT_NEAR(0.0f, rect.Right(), 0.00001f);
+  EXPECT_FLOAT_EQ(159.25f, rect.Top());
+}