155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
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#include "lsidefs.h"
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#include "lstfset.h"
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// %%Function: LsPointUV2FromPointUV1
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// %%Contact: victork
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//
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LSERR WINAPI LsPointUV2FromPointUV1(LSTFLOW lstflow1, /* IN: text flow 1 */
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PCPOINTUV pptStart, /* IN: start input point (TF1) */
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PCPOINTUV pptEnd, /* IN: end input point (TF1) */
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LSTFLOW lstflow2, /* IN: text flow 2 */
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PPOINTUV pptOut) /* OUT: vector in TF2 */
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{
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Assert(lstflowES == 0);
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Assert(lstflowEN == 1);
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Assert(lstflowSE == 2);
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Assert(lstflowSW == 3);
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Assert(lstflowWS == 4);
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Assert(lstflowWN == 5);
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Assert(lstflowNE == 6);
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Assert(lstflowNW == 7);
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// The three bits that constitute lstflow happens to have well defined meanings.
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//
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// Middle bit: on for vertical writing, off for horizontal.
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// First (low value) bit: "on" means v-axis points right or down (positive).
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// Third bit: "off" means u-axis points right or down (positive).
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//
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// So the algorithm of covertion (u1,v1) in lstflow1 to (u2,v2) in lstflow2 is:
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//
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// fHorizontalOrVertical1 = lstflow1 & fUVertical;
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// fUPositive1 = !(lstflow1 & fUDirection);
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// fVPositive1 = lstflow1 & fVDirection;
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// fHorizontalOrVertical2 = lstflow2 & fUVertical;
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// fUPositive2 = !(lstflow2 & fUDirection);
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// fVPositive2 = lstflow2 & fVDirection;
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//
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//
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// if (fHorizontalOrVertical1 == fHorizontalOrVertical2)
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// {
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// if (fUPositive1 == fUPositive2)
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// {
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// u2 = u1;
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// }
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// else
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// {
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// u2 = -u1;
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// }
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// if (fVPositive1 == fVPositive2)
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// {
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// v2 = v1;
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// }
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// else
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// {
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// v2 = -v1;
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// }
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// }
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// else
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// {
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// if (fUPositive1 == fVPositive2)
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// {
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// u2 = v1;
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// }
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// else
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// {
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// u2 = -v1;
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// }
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// if (fVPositive1 == fUPositive2)
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// {
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// v2 = u1;
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// }
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// else
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// {
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// v2 = -u1;
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// }
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// }
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//
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// Actual code is a little bit more compact.
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//
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// A hack (?): (!a == !b) is used instead of (((a==0) && (b==0)) || ((a!=0) && (b!=0)))
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if ((lstflow1 ^ lstflow2) & fUVertical) // one is vertical, another is horizontal
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{
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pptOut->u = (pptEnd->v - pptStart->v) *
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((!(lstflow2 & fUDirection) == !(lstflow1 & fVDirection)) ? -1 : 1);
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pptOut->v = (pptEnd->u - pptStart->u) *
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((!(lstflow2 & fVDirection) == !(lstflow1 & fUDirection)) ? -1 : 1);
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}
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else
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{
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pptOut->u = (pptEnd->u - pptStart->u) *
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(((lstflow1 ^ lstflow2) & fUDirection) ? -1 : 1);
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pptOut->v = (pptEnd->v - pptStart->v) *
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(((lstflow1 ^ lstflow2) & fVDirection) ? -1 : 1);
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}
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return lserrNone;
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}
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// %%Function: LsPointXYFromPointUV
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// %%Contact: victork
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//
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/* returns (x,y) point given (x,y) point and (u,v) vector */
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LSERR WINAPI LsPointXYFromPointUV(const POINT* pptXY, /* IN: input point (x,y) */
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LSTFLOW lstflow, /* IN: text flow for */
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PCPOINTUV pptUV, /* IN: vector in (u,v) */
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POINT* pptXYOut) /* OUT: point (x,y) */
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{
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switch (lstflow)
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{
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case lstflowES: /* latin */
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pptXYOut->x = pptXY->x + pptUV->u;
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pptXYOut->y = pptXY->y - pptUV->v;
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return lserrNone;
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case lstflowSW: /* vertical FE */
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pptXYOut->x = pptXY->x + pptUV->v;
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pptXYOut->y = pptXY->y + pptUV->u;
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return lserrNone;
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case lstflowWS: /* BiDi */
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pptXYOut->x = pptXY->x - pptUV->u;
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pptXYOut->y = pptXY->y - pptUV->v;
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return lserrNone;
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case lstflowEN:
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pptXYOut->x = pptXY->x + pptUV->u;
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pptXYOut->y = pptXY->y + pptUV->v;
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return lserrNone;
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case lstflowSE:
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pptXYOut->x = pptXY->x - pptUV->v;
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pptXYOut->y = pptXY->y + pptUV->u;
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return lserrNone;
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case lstflowWN:
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pptXYOut->x = pptXY->x - pptUV->u;
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pptXYOut->y = pptXY->y + pptUV->v;
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return lserrNone;
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case lstflowNE:
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pptXYOut->x = pptXY->x - pptUV->v;
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pptXYOut->y = pptXY->y - pptUV->u;
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return lserrNone;
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case lstflowNW:
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pptXYOut->x = pptXY->x + pptUV->v;
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pptXYOut->y = pptXY->y - pptUV->u;
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return lserrNone;
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default:
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NotReached();
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return lserrInvalidParameter;
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}
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}
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