1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/src/nsTransform2D.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef nsTransform2D_h___
1.10 +#define nsTransform2D_h___
1.11 +
1.12 +#include "gfxCore.h"
1.13 +#include "nsCoord.h"
1.14 +
1.15 +class NS_GFX nsTransform2D
1.16 +{
1.17 +private:
1.18 + /**
1.19 + * This represents the following matrix (note that the order of row/column
1.20 + * indices is opposite to usual notation)
1.21 + *
1.22 + * / m00 0 m20 \
1.23 + * M = | 0 m11 m21 |
1.24 + * \ 0 0 1 /
1.25 + *
1.26 + * Transformation of a coordinate (x, y) is obtained by setting
1.27 + * v = (x, y, 1)^T and evaluating M . v
1.28 + **/
1.29 +
1.30 + float m00, m11, m20, m21;
1.31 +
1.32 +public:
1.33 + nsTransform2D(void) { m20 = m21 = 0.0f; m00 = m11 = 1.0f; }
1.34 + nsTransform2D(nsTransform2D *aTransform2D) {
1.35 + m00 = aTransform2D->m00;
1.36 + m11 = aTransform2D->m11;
1.37 + m20 = aTransform2D->m20;
1.38 + m21 = aTransform2D->m21;
1.39 + }
1.40 +
1.41 + ~nsTransform2D(void) { }
1.42 +
1.43 + /**
1.44 + * set this transform to a translation
1.45 + *
1.46 + * @param tx, x translation
1.47 + * @param ty, y translation
1.48 + **/
1.49 +
1.50 + void SetToTranslate(float tx, float ty) { m00 = m11 = 1.0f; m20 = tx; m21 = ty; }
1.51 +
1.52 + /**
1.53 + * get the translation portion of this transform
1.54 + *
1.55 + * @param pt, Point to return translation values in
1.56 + **/
1.57 +
1.58 + void GetTranslationCoord(nscoord *ptX, nscoord *ptY) const { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); }
1.59 +
1.60 + /**
1.61 + * apply matrix to vector
1.62 + *
1.63 + * @param pt Point to transform
1.64 + **/
1.65 +
1.66 + void TransformCoord(nscoord *ptX, nscoord *ptY) const;
1.67 +
1.68 + /**
1.69 + * apply matrix to rect
1.70 + *
1.71 + * @param rect Rect to transform
1.72 + **/
1.73 +
1.74 + void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight) const;
1.75 +
1.76 + /**
1.77 + * add a scale to a Transform via x, y pair
1.78 + *
1.79 + * @param ptX x value to add as x scale
1.80 + * @param ptY y value to add as y scale
1.81 + **/
1.82 +
1.83 + void AddScale(float ptX, float ptY) { m00 *= ptX; m11 *= ptY; }
1.84 +
1.85 + /**
1.86 + * Set the scale (overriding any previous calls to AddScale, but leaving
1.87 + * any existing translation).
1.88 + *
1.89 + * @param ptX x value to add as x scale
1.90 + * @param ptY y value to add as y scale
1.91 + **/
1.92 +
1.93 + void SetScale(float ptX, float ptY) { m00 = ptX; m11 = ptY; }
1.94 +};
1.95 +
1.96 +#endif
