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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkTextMapStateProc_DEFINED
#define SkTextMapStateProc_DEFINED
#include "SkPoint.h"
#include "SkMatrixPriv.h"
class SkTextMapStateProc {
public:
SkTextMapStateProc(const SkMatrix& matrix, const SkPoint& offset, int scalarsPerPosition)
: fMatrix(matrix)
, fProc(SkMatrixPriv::GetMapXYProc(matrix))
, fOffset(offset)
, fScaleX(fMatrix.getScaleX()) {
SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
if (1 == scalarsPerPosition) {
unsigned mtype = fMatrix.getType();
if (mtype & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
fMapCase = kX;
} else {
// Bake the matrix scale/translation components into fOffset,
// to expedite proc computations.
fOffset.set(offset.x() * fMatrix.getScaleX() + fMatrix.getTranslateX(),
offset.y() * fMatrix.getScaleY() + fMatrix.getTranslateY());
if (mtype & SkMatrix::kScale_Mask) {
fMapCase = kOnlyScaleX;
} else {
fMapCase = kOnlyTransX;
}
}
} else {
fMapCase = kXY;
}
}
void operator()(const SkScalar pos[], SkPoint* loc) const;
private:
const SkMatrix& fMatrix;
enum {
kXY,
kOnlyScaleX,
kOnlyTransX,
kX
} fMapCase;
const SkMatrixPriv::MapXYProc fProc;
SkPoint fOffset; // In kOnly* mode, this includes the matrix translation component.
SkScalar fScaleX; // This is only used by kOnly... cases.
};
inline void SkTextMapStateProc::operator()(const SkScalar pos[], SkPoint* loc) const {
switch(fMapCase) {
case kXY:
fProc(fMatrix, pos[0] + fOffset.x(), pos[1] + fOffset.y(), loc);
break;
case kOnlyScaleX:
loc->set(fScaleX * *pos + fOffset.x(), fOffset.y());
break;
case kOnlyTransX:
loc->set(*pos + fOffset.x(), fOffset.y());
break;
default:
SkASSERT(false);
case kX:
fProc(fMatrix, *pos + fOffset.x(), fOffset.y(), loc);
break;
}
}
#endif
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