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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLinearBitmapPipeline_matrix_DEFINED
#define SkLinearBitmapPipeline_matrix_DEFINED
#include "SkLinearBitmapPipeline_core.h"
namespace {
class TranslateMatrixStrategy {
public:
TranslateMatrixStrategy(SkVector offset)
: fXOffset{X(offset)}
, fYOffset{Y(offset)} { }
void processPoints(Sk4s* xs, Sk4s* ys) const {
*xs = *xs + fXOffset;
*ys = *ys + fYOffset;
}
template <typename Next>
bool maybeProcessSpan(Span span, Next* next) const {
SkPoint start; SkScalar length; int count;
std::tie(start, length, count) = span;
next->pointSpan(Span{start + SkPoint{fXOffset, fYOffset}, length, count});
return true;
}
private:
const SkScalar fXOffset, fYOffset;
};
class ScaleMatrixStrategy {
public:
ScaleMatrixStrategy(SkVector offset, SkVector scale)
: fXOffset{X(offset)}, fYOffset{Y(offset)}
, fXScale{X(scale)}, fYScale{Y(scale)} { }
void processPoints(Sk4s* xs, Sk4s* ys) const {
*xs = *xs * fXScale + fXOffset;
*ys = *ys * fYScale + fYOffset;
}
template <typename Next>
bool maybeProcessSpan(Span span, Next* next) const {
SkPoint start; SkScalar length; int count;
std::tie(start, length, count) = span;
SkPoint newStart =
SkPoint{X(start) * fXScale + fXOffset, Y(start) * fYScale + fYOffset};
SkScalar newLength = length * fXScale;
next->pointSpan(Span{newStart, newLength, count});
return true;
}
private:
const SkScalar fXOffset, fYOffset;
const SkScalar fXScale, fYScale;
};
class AffineMatrixStrategy {
public:
AffineMatrixStrategy(SkVector offset, SkVector scale, SkVector skew)
: fXOffset{X(offset)}, fYOffset{Y(offset)}
, fXScale{X(scale)}, fYScale{Y(scale)}
, fXSkew{X(skew)}, fYSkew{Y(skew)} { }
void processPoints(Sk4s* xs, Sk4s* ys) const {
Sk4s newXs = fXScale * *xs + fXSkew * *ys + fXOffset;
Sk4s newYs = fYSkew * *xs + fYScale * *ys + fYOffset;
*xs = newXs;
*ys = newYs;
}
template <typename Next>
bool maybeProcessSpan(Span span, Next* next) const {
return false;
}
private:
const SkScalar fXOffset, fYOffset;
const SkScalar fXScale, fYScale;
const SkScalar fXSkew, fYSkew;
};
class PerspectiveMatrixStrategy {
public:
PerspectiveMatrixStrategy(SkVector offset, SkVector scale, SkVector skew,
SkVector zSkew, SkScalar zOffset)
: fXOffset{X(offset)}, fYOffset{Y(offset)}, fZOffset{zOffset}
, fXScale{X(scale)}, fYScale{Y(scale)}
, fXSkew{X(skew)}, fYSkew{Y(skew)}, fZXSkew{X(zSkew)}, fZYSkew{Y(zSkew)} { }
void processPoints(Sk4s* xs, Sk4s* ys) const {
Sk4s newXs = fXScale * *xs + fXSkew * *ys + fXOffset;
Sk4s newYs = fYSkew * *xs + fYScale * *ys + fYOffset;
Sk4s newZs = fZXSkew * *xs + fZYSkew * *ys + fZOffset;
*xs = newXs / newZs;
*ys = newYs / newZs;
}
template <typename Next>
bool maybeProcessSpan(Span span, Next* next) const {
return false;
}
private:
const SkScalar fXOffset, fYOffset, fZOffset;
const SkScalar fXScale, fYScale;
const SkScalar fXSkew, fYSkew, fZXSkew, fZYSkew;
};
} // namespace
#endif // SkLinearBitmapPipeline_matrix_DEFINED
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