Techwiki:Win32k/MATRIX

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typedef struct _MATRIX
{
  EFLOATOBJ efM11
  EFLOATOBJ efM12
  EFLOATOBJ efM21
  EFLOATOBJ efM22
  EFLOATOBJ efDx
  EFLOATOBJ efDy
  FIX fxDx
  FIX fxDy
  FLONG flAccel;
} MATRIX, PMATRIX;

flAccel:

#define XFORM_SCALE 1
#define XFORM_UNITY 2
#define XFORM_Y_NEG 4
#define XFORM_FORMAT_LTOFX 8
#define XFORM_FORMAT_FXTOL 0x10
#define XFORM_FORMAT_LTOL 0x20
#define XFORM_NO_TRANSLATION 040