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This new API takes advantage of the recently imported Mesa code to support inverse matrix calculation. The matrix code keeps track (via internal flags) of the transformations a matrix represents so that it can select an optimized inversion function. Note: although other aspects of the Cogl matrix API have followed a similar style to Cairo's matrix API we haven't added a cogl_matrix_invert API because the inverse of a CoglMatrix is actually cached as part of the CoglMatrix structure meaning a destructive API like cogl_matrix_invert doesn't let users take advantage of this caching design.