Add m-esr52 at 52.6.0

1 files changed, 310 insertions, 0 deletions

diff --git a/gfx/thebes/gfxMatrix.h b/gfx/thebes/gfxMatrix.h
new file mode 100644
index 000000000..9282a22db
--- /dev/null
+++ b/gfx/thebes/gfxMatrix.h
@@ -0,0 +1,310 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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 GFX_MATRIX_H
+#define GFX_MATRIX_H
+
+#include "gfxPoint.h"
+#include "gfxTypes.h"
+#include "gfxRect.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/gfx/MatrixFwd.h"
+
+// XX - I don't think this class should use gfxFloat at all,
+// but should use 'double' and be called gfxDoubleMatrix;
+// we can then typedef that to gfxMatrix where we typedef
+// double to be gfxFloat.
+
+/**
+ * A matrix that represents an affine transformation. Projective
+ * transformations are not supported. This matrix looks like:
+ *
+ * / a  b  0 \
+ * | c  d  0 |
+ * \ tx ty 1 /
+ *
+ * So, transforming a point (x, y) results in:
+ *
+ *           / a  b  0 \   / a * x + c * y + tx \ T
+ * (x y 1) * | c  d  0 | = | b * x + d * y + ty |
+ *           \ tx ty 1 /   \         1          /
+ *
+ */
+class gfxMatrix {
+public:
+    double _11; double _12;
+    double _21; double _22;
+    double _31; double _32;
+
+    /**
+     * Initializes this matrix as the identity matrix.
+     */
+    gfxMatrix() { Reset(); }
+
+    /**
+     * Initializes the matrix from individual components. See the class
+     * description for the layout of the matrix.
+     */
+    gfxMatrix(gfxFloat a, gfxFloat b, gfxFloat c, gfxFloat d, gfxFloat tx, gfxFloat ty) :
+        _11(a),  _12(b),
+        _21(c),  _22(d),
+        _31(tx), _32(ty) { }
+
+    MOZ_ALWAYS_INLINE gfxMatrix Copy() const {
+        return gfxMatrix(*this);
+    }
+
+    friend std::ostream& operator<<(std::ostream& stream, const gfxMatrix& m) {
+      if (m.IsIdentity()) {
+        return stream << "[identity]";
+      }
+
+      return stream << "["
+             << m._11 << " " << m._12
+             << m._21 << " " << m._22
+             << m._31 << " " << m._32
+             << "]";
+    }
+
+    /**
+     * Post-multiplies m onto the matrix.
+     */
+    const gfxMatrix& operator *= (const gfxMatrix& m);
+
+    /**
+     * Multiplies *this with m and returns the result.
+     */
+    gfxMatrix operator * (const gfxMatrix& m) const {
+        return gfxMatrix(*this) *= m;
+    }
+
+    /**
+     * Multiplies *this with aMatrix and returns the result.
+     */
+    mozilla::gfx::Matrix4x4 operator * (const mozilla::gfx::Matrix4x4& aMatrix) const;
+
+    /* Returns true if the other matrix is fuzzy-equal to this matrix.
+     * Note that this isn't a cheap comparison!
+     */
+    bool operator==(const gfxMatrix& other) const
+    {
+      return FuzzyEqual(_11, other._11) && FuzzyEqual(_12, other._12) &&
+             FuzzyEqual(_21, other._21) && FuzzyEqual(_22, other._22) &&
+             FuzzyEqual(_31, other._31) && FuzzyEqual(_32, other._32);
+    }
+
+    bool operator!=(const gfxMatrix& other) const
+    {
+      return !(*this == other);
+    }
+
+    // matrix operations
+    /**
+     * Resets this matrix to the identity matrix.
+     */
+    const gfxMatrix& Reset();
+
+    bool IsIdentity() const {
+       return _11 == 1.0 && _12 == 0.0 &&
+              _21 == 0.0 && _22 == 1.0 &&
+              _31 == 0.0 && _32 == 0.0;
+    }
+
+    /**
+     * Inverts this matrix, if possible. Otherwise, the matrix is left
+     * unchanged.
+     *
+     * XXX should this do something with the return value of
+     * cairo_matrix_invert?
+     */
+    bool Invert();
+
+    /**
+     * Check if matrix is singular (no inverse exists).
+     */
+    bool IsSingular() const {
+        // if the determinant (ad - bc) is zero it's singular
+        return (_11 * _22) == (_12 * _21);
+    }
+
+    /**
+     * Scales this matrix. The scale is pre-multiplied onto this matrix,
+     * i.e. the scaling takes place before the other transformations.
+     */
+    gfxMatrix& Scale(gfxFloat x, gfxFloat y);
+
+    /**
+     * Translates this matrix. The translation is pre-multiplied onto this matrix,
+     * i.e. the translation takes place before the other transformations.
+     */
+    gfxMatrix& Translate(const gfxPoint& pt);
+
+    gfxMatrix& Translate(gfxFloat x, gfxFloat y) {
+      return Translate(gfxPoint(x, y));
+    }
+
+    /**
+     * Rotates this matrix. The rotation is pre-multiplied onto this matrix,
+     * i.e. the translation takes place after the other transformations.
+     *
+     * @param radians Angle in radians.
+     */
+    gfxMatrix& Rotate(gfxFloat radians);
+
+    /**
+     * Multiplies the current matrix with m.
+     * This is a pre-multiplication, i.e. the transformations of m are
+     * applied _before_ the existing transformations.
+     */
+    gfxMatrix& PreMultiply(const gfxMatrix& m);
+
+    static gfxMatrix Translation(gfxFloat aX, gfxFloat aY)
+    {
+        return gfxMatrix(1.0, 0.0, 0.0, 1.0, aX, aY);
+    }
+
+    static gfxMatrix Translation(gfxPoint aPoint)
+    {
+        return Translation(aPoint.x, aPoint.y);
+    }
+
+    static gfxMatrix Rotation(gfxFloat aAngle);
+
+    static gfxMatrix Scaling(gfxFloat aX, gfxFloat aY)
+    {
+        return gfxMatrix(aX, 0.0, 0.0, aY, 0.0, 0.0);
+    }
+
+    /**
+     * Transforms a point according to this matrix.
+     */
+    gfxPoint Transform(const gfxPoint& point) const;
+
+
+    /**
+     * Transform a distance according to this matrix. This does not apply
+     * any translation components.
+     */
+    gfxSize Transform(const gfxSize& size) const;
+
+    /**
+     * Transforms both the point and distance according to this matrix.
+     */
+    gfxRect Transform(const gfxRect& rect) const;
+
+    gfxRect TransformBounds(const gfxRect& rect) const;
+
+    /**
+     * Returns the translation component of this matrix.
+     */
+    gfxPoint GetTranslation() const {
+        return gfxPoint(_31, _32);
+    }
+
+    /**
+     * Returns true if the matrix is anything other than a straight
+     * translation by integers.
+     */
+    bool HasNonIntegerTranslation() const {
+        return HasNonTranslation() ||
+            !FuzzyEqual(_31, floor(_31 + 0.5)) ||
+            !FuzzyEqual(_32, floor(_32 + 0.5));
+    }
+
+    /**
+     * Returns true if the matrix has any transform other
+     * than a straight translation
+     */
+    bool HasNonTranslation() const {
+        return !FuzzyEqual(_11, 1.0) || !FuzzyEqual(_22, 1.0) ||
+               !FuzzyEqual(_21, 0.0) || !FuzzyEqual(_12, 0.0);
+    }
+
+    /**
+     * Returns true if the matrix only has an integer translation.
+     */
+    bool HasOnlyIntegerTranslation() const {
+        return !HasNonIntegerTranslation();
+    }
+
+    /**
+     * Returns true if the matrix has any transform other
+     * than a translation or a -1 y scale (y axis flip)
+     */
+    bool HasNonTranslationOrFlip() const {
+        return !FuzzyEqual(_11, 1.0) ||
+               (!FuzzyEqual(_22, 1.0) && !FuzzyEqual(_22, -1.0)) ||
+               !FuzzyEqual(_21, 0.0) || !FuzzyEqual(_12, 0.0);
+    }
+
+    /**
+     * Returns true if the matrix has any transform other
+     * than a translation or scale; this is, if there is
+     * no rotation.
+     */
+    bool HasNonAxisAlignedTransform() const {
+        return !FuzzyEqual(_21, 0.0) || !FuzzyEqual(_12, 0.0);
+    }
+
+    /**
+     * Computes the determinant of this matrix.
+     */
+    double Determinant() const {
+        return _11*_22 - _12*_21;
+    }
+
+    /* Computes the scale factors of this matrix; that is,
+     * the amounts each basis vector is scaled by.
+     * The xMajor parameter indicates if the larger scale is
+     * to be assumed to be in the X direction or not.
+     */
+    gfxSize ScaleFactors(bool xMajor) const {
+        double det = Determinant();
+
+        if (det == 0.0)
+            return gfxSize(0.0, 0.0);
+
+        gfxSize sz = xMajor ? gfxSize(1.0, 0.0) : gfxSize(0.0, 1.0);
+        sz = Transform(sz);
+
+        double major = sqrt(sz.width * sz.width + sz.height * sz.height);
+        double minor = 0.0;
+
+        // ignore mirroring
+        if (det < 0.0)
+            det = - det;
+
+        if (major)
+            minor = det / major;
+
+        if (xMajor)
+            return gfxSize(major, minor);
+
+        return gfxSize(minor, major);
+    }
+
+    /**
+     * Snap matrix components that are close to integers
+     * to integers. In particular, components that are integral when
+     * converted to single precision are set to those integers.
+     */
+    gfxMatrix& NudgeToIntegers(void);
+
+    /**
+     * Returns true if matrix is multiple of 90 degrees rotation with flipping,
+     * scaling and translation.
+     */
+    bool PreservesAxisAlignedRectangles() const {
+        return ((FuzzyEqual(_11, 0.0) && FuzzyEqual(_22, 0.0))
+            || (FuzzyEqual(_21, 0.0) && FuzzyEqual(_12, 0.0)));
+    }
+
+private:
+    static bool FuzzyEqual(gfxFloat aV1, gfxFloat aV2) {
+        return fabs(aV2 - aV1) < 1e-6;
+    }
+};
+
+#endif /* GFX_MATRIX_H */