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110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
#pragma once
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable:28110) // disable "Drivers must protect floating point hardware state" warning
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#endif
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typedef struct tagFLOAT_POINT
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{
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FLOAT x, y;
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} FLOAT_POINT;
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/* Rounds a floating point number to integer. The world-to-viewport
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* transformation process is done in floating point internally. This function
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* is then used to round these coordinates to integer values.
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*/
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static __inline INT GDI_ROUND(FLOAT val)
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{
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return (int)floor(val + 0.5);
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}
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/* FIXME: Do not use the fpu in kernel on x86, use FLOATOBJ_Xxx api instead
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* Performs a world-to-viewport transformation on the specified point (which
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* is in floating point format).
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*/
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static __inline void INTERNAL_LPTODP_FLOAT(DC *dc, FLOAT_POINT *point)
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{
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FLOAT x, y;
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XFORM xformWorld2Vport;
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MatrixS2XForm(&xformWorld2Vport, &dc->pdcattr->mxWorldToDevice);
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/* Perform the transformation */
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x = point->x;
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y = point->y;
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point->x = x * xformWorld2Vport.eM11 +
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y * xformWorld2Vport.eM21 +
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xformWorld2Vport.eDx;
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point->y = x * xformWorld2Vport.eM12 +
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y * xformWorld2Vport.eM22 +
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xformWorld2Vport.eDy;
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}
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/* Performs a viewport-to-world transformation on the specified point (which
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* is in integer format). Returns TRUE if successful, else FALSE.
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*/
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#if 0
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static __inline BOOL INTERNAL_DPTOLP(DC *dc, LPPOINT point)
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{
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FLOAT_POINT floatPoint;
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/* Perform operation with floating point */
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floatPoint.x=(FLOAT)point->x;
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floatPoint.y=(FLOAT)point->y;
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if (!INTERNAL_DPTOLP_FLOAT(dc, &floatPoint))
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return FALSE;
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/* Round to integers */
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point->x = GDI_ROUND(floatPoint.x);
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point->y = GDI_ROUND(floatPoint.y);
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return TRUE;
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}
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/* Performs a world-to-viewport transformation on the specified point (which
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* is in integer format).
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*/
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static __inline void INTERNAL_LPTODP(DC *dc, LPPOINT point)
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{
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FLOAT_POINT floatPoint;
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/* Perform operation with floating point */
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floatPoint.x=(FLOAT)point->x;
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floatPoint.y=(FLOAT)point->y;
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INTERNAL_LPTODP_FLOAT(dc, &floatPoint);
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/* Round to integers */
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point->x = GDI_ROUND(floatPoint.x);
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point->y = GDI_ROUND(floatPoint.y);
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}
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#endif
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#define MulDiv( x, y, z ) EngMulDiv( x, y, z )
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#define XDPTOLP(pdcattr,tx) \
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(MulDiv(((tx)-(pdcattr)->ptlViewportOrg.x), (pdcattr)->szlWindowExt.cx, (pdcattr)->szlViewportExt.cx) + (pdcattr)->ptlWindowOrg.x)
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#define YDPTOLP(pdcattr,ty) \
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(MulDiv(((ty)-(pdcattr)->ptlViewportOrg.y), (pdcattr)->szlWindowExt.cy, (pdcattr)->szlViewportExt.cy) + (pdcattr)->ptlWindowOrg.y)
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#define XLPTODP(pdcattr,tx) \
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(MulDiv(((tx)-(pdcattr)->ptlWindowOrg.x), (pdcattr)->szlViewportExt.cx, (pdcattr)->szlWindowExt.cx) + (pdcattr)->ptlViewportOrg.x)
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#define YLPTODP(pdcattr,ty) \
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(MulDiv(((ty)-(pdcattr)->ptlWindowOrg.y), (pdcattr)->szlViewportExt.cy, (pdcattr)->szlWindowExt.cy) + (pdcattr)->ptlViewportOrg.y)
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/* Device <-> logical size conversion */
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#define XDSTOLS(pdcattr,tx) \
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MulDiv((tx), (pdcattr)->szlWindowExt.cx, (pdcattr)->szlViewportExt.cx)
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#define YDSTOLS(DC_Attr,ty) \
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MulDiv((ty), (pdcattr)->szlWindowExt.cy, (pdcattr)->szlViewportExt.cy)
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#define XLSTODS(pdcattr,tx) \
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MulDiv((tx), (pdcattr)->szlViewportExt.cx, (pdcattr)->szlWindowExt.cx)
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#define YLSTODS(pdcattr,ty) \
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MulDiv((ty), (pdcattr)->szlViewportExt.cy, (pdcattr)->szlWindowExt.cy)
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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