Slightly reduced the CPU usage of SpriteBatch:add, Text:add, and love.graphics.draw(ParticleSystem).

src/common/Matrix.cpp

@@ -221,6 +221,11 @@ Matrix3::Matrix3(const Matrix4 &mat4)
 	e[8] = mat4elems[10];
 }
 
+Matrix3::Matrix3(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky)
+{
+	setTransformation(x, y, angle, sx, sy, ox, oy, kx, ky);
+}
+
 Matrix3::~Matrix3()
 {
 }
@@ -288,4 +293,23 @@ Matrix3 Matrix3::transposedInverse() const
 	return m;
 }
 
+void Matrix3::setTransformation(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky)
+{
+	float c = cosf(angle), s = sinf(angle);
+	// matrix multiplication carried out on paper:
+	// |1    x| |c -s  | |sx     | | 1 ky  | |1   -ox|
+	// |  1  y| |s  c  | |   sy  | |kx  1  | |  1 -oy|
+	// |     1| |     1| |      1| |      1| |     1 |
+	//   move    rotate    scale     skew      origin
+	e[0] = c * sx - ky * s * sy; // = a
+	e[1] = s * sx + ky * c * sy; // = b
+	e[3] = kx * c * sx - s * sy; // = c
+	e[4] = kx * s * sx + c * sy; // = d
+	e[6] = x - ox * e[0] - oy * e[3];
+	e[7] = y - ox * e[1] - oy * e[4];
+
+	e[2] = e[5] = 0.0f;
+	e[8] = 1.0f;
+}
+
 } // love

src/common/Matrix.h

@@ -185,6 +185,11 @@ public:
 	 **/
 	Matrix3(const Matrix4 &mat4);
 
+	/**
+	 * Creates a new matrix set to a transformation.
+	 **/
+	Matrix3(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky);
+
 	~Matrix3();
 
 	/**
@@ -205,6 +210,22 @@ public:
 	 **/
 	Matrix3 transposedInverse() const;
 
+	/**
+	 * Creates a transformation with a certain position, orientation, scale
+	 * and offset.
+	 *
+	 * @param x The translation along the x-axis.
+	 * @param y The translation along the y-axis.
+	 * @param angle The rotation (rad) around the center with offset (ox,oy).
+	 * @param sx Scale along x-axis.
+	 * @param sy Scale along y-axis.
+	 * @param ox The offset for rotation along the x-axis.
+	 * @param oy The offset for rotation along the y-axis.
+	 * @param kx Shear along x-axis
+	 * @param ky Shear along y-axis
+	 **/
+	void setTransformation(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky);
+
 	/**
 	 * Transforms an array of vertices by this matrix.
 	 **/