libs/agg/agg_trans_perspective.h

30         double sx, shy, w0, shx, sy, w1, tx, ty, w2;
36             shx(0), sy (1), w1(0),
44            shx(v3), sy (v4), w1(v5),
50            shx(m[3]), sy (m[4]), w1(m[5]),
56            shx(a.shx), sy (a.sy ), w1(0),
249                 nom_y(px * m.shy + py * m.sy + m.ty),
299             sy  = q[5] - q[3];
316                 sx = shy = w0 = shx = sy = w1 = tx = ty = w2 = 0.0;
327             sy  = q[7] - q[1] + v * q[7];
339         double d0 = sy  * w2 - w1  * ty;
341         double d2 = shy * w1 - w0  * sy;
345             sx = shy = w0 = shx = sy = w1 = tx = ty = w2 = 0.0;
354         sy  = d * (a.sx *a.w2  - a.w0 *a.tx);
356         tx  = d * (a.shx*a.ty  - a.sy *a.tx);
358         w2  = d * (a.sx *a.sy  - a.shy*a.shx);
434         shx = 0; sy  = 1; w1 = 0;
445         shx = a.sx *b.shx + a.shx*b.sy  + a.tx*b.w1;
447         shy = a.shy*b.sx  + a.sy *b.shy + a.ty*b.w0;
448         sy  = a.shy*b.shx + a.sy *b.sy  + a.ty*b.w1;
449         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty*b.w2;
451         w1  = a.w0 *b.shx + a.w1 *b.sy  + a.w2*b.w1;
462         shx = a.sx *b.shx + a.shx*b.sy  + a.tx*b.w1;
464         shy = a.shy*b.sx  + a.sy *b.shy + a.ty*b.w0;
465         sy  = a.shy*b.shx + a.sy *b.sy  + a.ty*b.w1;
466         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty*b.w2;
476         shx = a.sx *b.shx + a.shx*b.sy  + a.tx*b.w1;
478         shy = a.shy*b.sx  + a.sy *b.shy + a.ty*b.w0;
479         sy  = a.shy*b.shx + a.sy *b.sy  + a.ty*b.w1;
480         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty*b.w2;
482         w1  = a.w0 *b.shx + a.w1 *b.sy  + a.w2*b.w1;
493         shx = a.sx *b.shx + a.shx*b.sy;
495         shy = a.shy*b.sx  + a.sy *b.shy;
496         sy  = a.shy*b.shx + a.sy *b.sy;
497         ty  = a.shy*b.tx  + a.sy *b.ty  + a.ty;
499         w1  = a.w0 *b.shx + a.w1 *b.sy;
577         *py = m * (x*shy + y*sy  + ty);
585         *y = tmp * shy + *y * sy  + ty;
593         *y = tmp * shy + *y * sy;
607         *m++ = shx; *m++ = sy;  *m++ = w1;
615         shx = *m++; sy  = *m++; w1 = *m++;
625         shx = a.shx; sy  = a.sy;  w1 = 0;
633         return sx  * (sy  * w2 - ty  * w1) +
635                tx  * (shy * w1 - sy  * w0);
647         return std::fabs(sx) > epsilon && std::fabs(sy) > epsilon && std::fabs(w2) > epsilon;
657                is_equal_eps(sy,  1.0, epsilon) &&
672                is_equal_eps(sy,  m.sy,  epsilon) &&
683         double y = 0.707106781 * shy + 0.707106781 * sy;
725         *y = std::sqrt(shy * shy + sy  * sy);