From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 gfx/src/nsTransform2D.h | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 gfx/src/nsTransform2D.h

(limited to 'gfx/src/nsTransform2D.h')

diff --git a/gfx/src/nsTransform2D.h b/gfx/src/nsTransform2D.h
new file mode 100644
index 000000000..8999b2cf3
--- /dev/null
+++ b/gfx/src/nsTransform2D.h
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsTransform2D_h___
+#define nsTransform2D_h___
+
+#include "nsCoord.h"
+
+class nsTransform2D
+{
+private:
+ /**
+  * This represents the following matrix (note that the order of row/column
+  * indices is opposite to usual notation)
+  *
+  *      / m00   0   m20  \
+  * M =  |  0   m11  m21  |
+  *      \  0    0    1   /
+  *
+  * Transformation of a coordinate (x, y) is obtained by setting
+  * v = (x, y, 1)^T and evaluating  M . v
+  **/
+
+  float     m00, m11, m20, m21;
+
+public:
+  nsTransform2D(void)                         { m20 = m21 = 0.0f; m00 = m11 = 1.0f; }
+
+  ~nsTransform2D(void)                        { }
+
+ /**
+  * set this transform to a translation
+  *
+  * @param      tx, x translation
+  * @param      ty, y translation
+  **/
+
+  void SetToTranslate(float tx, float ty)    { m00 = m11 = 1.0f; m20 = tx; m21 = ty; }
+  
+ /**
+  * get the translation portion of this transform
+  *
+  * @param      pt, Point to return translation values in
+  **/
+
+  void GetTranslationCoord(nscoord *ptX, nscoord *ptY) const { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); }
+
+ /**
+  * apply matrix to vector
+  *
+  * @param    pt Point to transform
+  **/
+
+  void TransformCoord(nscoord *ptX, nscoord *ptY) const;
+
+ /**
+  * apply matrix to rect
+  *
+  * @param    rect Rect to transform
+  **/
+
+  void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight) const;
+
+ /**
+  * add a scale to a Transform via x, y pair
+  *
+  * @param    ptX x value to add as x scale
+  * @param    ptY y value to add as y scale
+  **/
+
+  void AddScale(float ptX, float ptY) { m00 *= ptX; m11 *= ptY; }
+
+ /**
+  * Set the scale (overriding any previous calls to AddScale, but leaving
+  * any existing translation).
+  *
+  * @param    ptX x value to add as x scale
+  * @param    ptY y value to add as y scale
+  **/
+
+  void SetScale(float ptX, float ptY) { m00 = ptX; m11 = ptY; }
+};
+
+#endif
-- 
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