<!-- ##### SECTION Title ##### -->
GimpMatrix

<!-- ##### SECTION Short_Description ##### -->
Utilities to set up and manipulate 3x3 transformation matrices.

<!-- ##### SECTION Long_Description ##### -->
<para>
When doing image manipulation you will often need 3x3 transformation
matrices that define translation, rotation, scaling, shearing and 
arbitrary perspective transformations using a 3x3 matrix. Here you'll 
find a set of utility functions to set up those matrices and to perform 
basic matrix manipulations and tests.
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
#GimpVector2
</para>
<para>
#GimpVector3
</para>
<para>
#GimpVector4
</para>

<!-- ##### STRUCT GimpMatrix2 ##### -->
<para>
A two by two matrix.
</para>

@coeff: 

<!-- ##### STRUCT GimpMatrix3 ##### -->
<para>
A three by three matrix.
</para>

@coeff: 

<!-- ##### STRUCT GimpMatrix4 ##### -->
<para>
A four by four matrix.
</para>

@coeff: 

<!-- ##### FUNCTION gimp_matrix2_identity ##### -->
<para>

</para>

@matrix: 


<!-- ##### FUNCTION gimp_matrix2_mult ##### -->
<para>

</para>

@matrix1: 
@matrix2: 


<!-- ##### FUNCTION gimp_matrix3_identity ##### -->
<para>

</para>

@matrix: 


<!-- ##### FUNCTION gimp_matrix3_mult ##### -->
<para>

</para>

@matrix1: 
@matrix2: 


<!-- ##### FUNCTION gimp_matrix3_translate ##### -->
<para>

</para>

@matrix: 
@x: 
@y: 


<!-- ##### FUNCTION gimp_matrix3_scale ##### -->
<para>

</para>

@matrix: 
@x: 
@y: 


<!-- ##### FUNCTION gimp_matrix3_rotate ##### -->
<para>

</para>

@matrix: 
@theta: 


<!-- ##### FUNCTION gimp_matrix3_xshear ##### -->
<para>

</para>

@matrix: 
@amount: 


<!-- ##### FUNCTION gimp_matrix3_yshear ##### -->
<para>

</para>

@matrix: 
@amount: 


<!-- ##### FUNCTION gimp_matrix3_affine ##### -->
<para>

</para>

@matrix: 
@a: 
@b: 
@c: 
@d: 
@e: 
@f: 


<!-- ##### FUNCTION gimp_matrix3_transform_point ##### -->
<para>

</para>

@matrix: 
@x: 
@y: 
@newx: 
@newy: 


<!-- ##### FUNCTION gimp_matrix3_determinant ##### -->
<para>

</para>

@matrix: 
@Returns: 


<!-- ##### FUNCTION gimp_matrix3_invert ##### -->
<para>

</para>

@matrix: 


<!-- ##### FUNCTION gimp_matrix3_is_diagonal ##### -->
<para>

</para>

@matrix: 
@Returns: 


<!-- ##### FUNCTION gimp_matrix3_is_identity ##### -->
<para>

</para>

@matrix: 
@Returns: 


<!-- ##### FUNCTION gimp_matrix3_is_simple ##### -->
<para>

</para>

@matrix: 
@Returns: 


<!-- ##### FUNCTION gimp_matrix4_to_deg ##### -->
<para>

</para>

@matrix: 
@a: 
@b: 
@c: 


