diff options
Diffstat (limited to 'gpu/include/GrPoint.h')
| -rw-r--r-- | gpu/include/GrPoint.h | 302 |
1 files changed, 3 insertions, 299 deletions
diff --git a/gpu/include/GrPoint.h b/gpu/include/GrPoint.h index c07543b..472efb3 100644 --- a/gpu/include/GrPoint.h +++ b/gpu/include/GrPoint.h @@ -20,112 +20,10 @@ #include "GrTypes.h" #include "GrScalar.h" +#include "SkPoint.h" -/** - * 2D Point struct - */ -struct GrPoint { -public: - GrScalar fX, fY; - - GrPoint() {} - GrPoint(GrScalar x, GrScalar y) { fX = x; fY = y; } - - GrScalar x() const { return fX; } - GrScalar y() const { return fY; } - - void set(GrScalar x, GrScalar y) { - fX = x; - fY = y; - } - - void setAsMidPoint(const GrPoint& a, const GrPoint& b) { - fX = GrScalarAve(a.fX, b.fX); - fY = GrScalarAve(a.fY, b.fY); - } - - void offset(GrScalar dx, GrScalar dy) { - fX += dx; - fY += dy; - } - - GrScalar distanceToSqd(const GrPoint& p) const { - GrScalar dx = (p.fX - fX); - GrScalar dy = (p.fY - fY); - return GrMul(dx, dx) + GrMul(dy, dy); - } - - GrScalar distanceTo(const GrPoint& p) const { - // TODO: fixed point sqrt - return GrFloatToScalar(sqrtf(GrScalarToFloat(distanceToSqd(p)))); - } - - GrScalar distanceToOriginSqd() const { - return GrMul(fX, fX) + GrMul(fY, fY); - } - - GrScalar distanceToOrigin() const { - return GrFloatToScalar(sqrtf(GrScalarToFloat(distanceToOriginSqd()))); - } - - inline GrScalar distanceToLineBetweenSqd(const GrPoint& a, - const GrPoint& b) const; - - inline GrScalar distanceToLineBetween(const GrPoint& a, - const GrPoint& b) const; - - inline GrScalar distanceToLineSegmentBetweenSqd(const GrPoint& a, - const GrPoint& b) const; - - inline GrScalar distanceToLineSegmentBetween(const GrPoint& a, - const GrPoint& b) const; - - // counter-clockwise fan - void setRectFan(GrScalar l, GrScalar t, GrScalar r, GrScalar b) { - GrPoint* v = this; - v[0].set(l, t); - v[1].set(l, b); - v[2].set(r, b); - v[3].set(r, t); - } - - void setRectFan(GrScalar l, GrScalar t, GrScalar r, GrScalar b, size_t stride) { - GrAssert(stride >= sizeof(GrPoint)); - ((GrPoint*)((intptr_t)this + 0 * stride))->set(l, t); - ((GrPoint*)((intptr_t)this + 1 * stride))->set(l, b); - ((GrPoint*)((intptr_t)this + 2 * stride))->set(r, b); - ((GrPoint*)((intptr_t)this + 3 * stride))->set(r, t); - } - - // counter-clockwise fan - void setIRectFan(int l, int t, int r, int b) { - GrPoint* v = this; - v[0].set(GrIntToScalar(l), GrIntToScalar(t)); - v[1].set(GrIntToScalar(l), GrIntToScalar(b)); - v[2].set(GrIntToScalar(r), GrIntToScalar(b)); - v[3].set(GrIntToScalar(r), GrIntToScalar(t)); - } - - void setIRectFan(int l, int t, int r, int b, size_t stride) { - GrAssert(stride >= sizeof(GrPoint)); - ((GrPoint*)((intptr_t)this + 0 * stride))->set(GrIntToScalar(l), - GrIntToScalar(t)); - ((GrPoint*)((intptr_t)this + 1 * stride))->set(GrIntToScalar(l), - GrIntToScalar(b)); - ((GrPoint*)((intptr_t)this + 2 * stride))->set(GrIntToScalar(r), - GrIntToScalar(b)); - ((GrPoint*)((intptr_t)this + 3 * stride))->set(GrIntToScalar(r), - GrIntToScalar(t)); - } - - bool operator ==(const GrPoint& p) const { - return fX == p.fX && fY == p.fY; - } - - bool operator !=(const GrPoint& p) const { - return fX != p.fX || fY != p.fY; - } -}; +#define GrPoint SkPoint +#define GrVec SkVector struct GrIPoint16 { int16_t fX, fY; @@ -136,199 +34,5 @@ struct GrIPoint16 { } }; -struct GrVec { -public: - GrScalar fX, fY; - - GrVec() {} - GrVec(GrScalar x, GrScalar y) { fX = x; fY = y; } - - GrScalar x() const { return fX; } - GrScalar y() const { return fY; } - - /** - * set x and y length of the vector. - */ - void set(GrScalar x, GrScalar y) { - fX = x; - fY = y; - } - - /** - * set vector to point from a to b. - */ - void setBetween(const GrPoint& a, const GrPoint& b) { - fX = b.fX - a.fX; - fY = b.fY - a.fY; - } - - /** - * Make this vector be orthogonal to vec. Looking down vec the - * new vector will point left. - */ - void setOrthogLeft(const GrVec& vec) { - // vec could be this - GrVec v = vec; - fX = -v.fY; - fY = v.fX; - } - - /** - * Make this vector be orthogonal to vec. Looking down vec the - * new vector will point right. - */ - void setOrthogRight(const GrVec& vec) { - // vec could be this - GrVec v = vec; - fX = v.fY; - fY = -v.fX; - } - - /** - * set orthogonal to vec from a to b. Will be facing left relative to a,b - * vec - */ - void setOrthogLeftToVecBetween(const GrPoint& a, const GrPoint& b) { - fX = a.fY - b.fY; - fY = b.fX - a.fX; - } - - /** - * set orthogonal to vec from a to b. Will be facing right relative to a,b - * vec. - */ - void setOrthogRightToVecBetween(const GrPoint& a, const GrPoint& b) { - fX = b.fY - a.fY; - fY = a.fX - b.fX; - } - - /** - * length of the vector squared. - */ - GrScalar lengthSqd() const { - return GrMul(fX, fX) + GrMul(fY, fY); - } - - /** - * length of the vector. - */ - GrScalar length() const { - // TODO: fixed point sqrt - return GrFloatToScalar(sqrtf(GrScalarToFloat(lengthSqd()))); - } - - /** - * normalizes the vector if it's length is not 0. - * @return true if normalized, otherwise false. - */ - bool normalize() { - GrScalar l = lengthSqd(); - if (l) { - // TODO: fixed point sqrt and invert - l = 1 / sqrtf(l); - fX *= l; - fY *= l; - return true; - } - return false; - } - - /** - * Dot product of this with vec. - */ - GrScalar dot(const GrVec& vec) const { - return GrMul(vec.fX, fX) + GrMul(vec.fY, fY); - } - - /** - * Dot product of this vec with vector from (0,0) to a pt. - */ - GrScalar dotWithVecToPt(const GrPoint& pt) const { - return GrMul(pt.fX, fX) + GrMul(pt.fY, fY); - } - - /** - * z-value of this cross vec. - */ - GrScalar cross(const GrVec& vec) const { - return GrMul(fX, vec.fY) - GrMul(fY, vec.fX); - } - - bool operator ==(const GrPoint& p) const { - return fX == p.fX && fY == p.fY; - } - - bool operator !=(const GrPoint& p) const { - return fX != p.fX || fY != p.fY; - } -}; - -GrScalar GrPoint::distanceToLineBetweenSqd(const GrPoint& a, - const GrPoint& b) const { - // Let d be the distance between c (this) and line ab. - // The area of the triangle defined by a, b, and c is - // A = |b-a|*d/2. Let u = b-a and v = c-a. The cross product of - // u and v is aligned with the z axis and its magnitude is 2A. - // So d = |u x v| / |u|. - GrVec u, v; - u.setBetween(a,b); - v.setBetween(a,*this); - - GrScalar det = u.cross(v); - return (GrMul(det, det)) / u.lengthSqd(); -} - -GrScalar GrPoint::distanceToLineBetween(const GrPoint& a, - const GrPoint& b) const { - GrVec u, v; - u.setBetween(a,b); - v.setBetween(a,*this); - - GrScalar det = u.cross(v); - return (GrScalarAbs(det)) / u.length(); -} - -GrScalar GrPoint::distanceToLineSegmentBetweenSqd(const GrPoint& a, - const GrPoint& b) const { - // See comments to distanceToLineBetweenSqd. If the projection of c onto - // u is between a and b then this returns the same result as that - // function. Otherwise, it returns the distance to the closer of a and - // b. Let the projection of v onto u be v'. There are three cases: - // 1. v' points opposite to u. c is not between a and b and is closer - // to a than b. - // 2. v' points along u and has magnitude less than y. c is between - // a and b and the distance to the segment is the same as distance - // to the line ab. - // 3. v' points along u and has greater magnitude than u. c is not - // not between a and b and is closer to b than a. - // v' = (u dot v) * u / |u|. So if (u dot v)/|u| is less than zero we're - // in case 1. If (u dot v)/|u| is > |u| we are in case 3. Otherwise - // we're in case 2. We actually compare (u dot v) to 0 and |u|^2 to - // avoid a sqrt to compute |u|. - - GrVec u, v; - u.setBetween(a,b); - v.setBetween(a,*this); - - GrScalar uLengthSqd = u.lengthSqd(); - GrScalar uDotV = u.dot(v); - - if (uDotV <= 0) { - return v.lengthSqd(); - } else if (uDotV > uLengthSqd) { - return b.distanceToSqd(*this); - } else { - GrScalar det = u.cross(v); - return (GrMul(det, det)) / uLengthSqd; - } -} - -GrScalar GrPoint::distanceToLineSegmentBetween(const GrPoint& a, - const GrPoint& b) const { - // TODO: fixed point sqrt - return GrFloatToScalar(sqrtf(GrScalarToFloat(distanceToLineSegmentBetweenSqd(a,b)))); -} - - #endif |