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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkDrawProcs_DEFINED
#define SkDrawProcs_DEFINED
#include "SkDraw.h"
#include "SkGlyph.h"
bool SkDrawTreatAAStrokeAsHairline(SkScalar strokeWidth, const SkMatrix&,
SkScalar* coverage);
/**
* If the current paint is set to stroke and the stroke-width when applied to
* the matrix is <= 1.0, then this returns true, and sets coverage (simulating
* a stroke by drawing a hairline with partial coverage). If any of these
* conditions are false, then this returns false and coverage is ignored.
*/
inline bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix,
SkScalar* coverage) {
if (SkPaint::kStroke_Style != paint.getStyle()) {
return false;
}
SkScalar strokeWidth = paint.getStrokeWidth();
if (0 == strokeWidth) {
*coverage = SK_Scalar1;
return true;
}
if (!paint.isAntiAlias()) {
return false;
}
return SkDrawTreatAAStrokeAsHairline(strokeWidth, matrix, coverage);
}
class SkTextAlignProc {
public:
SkTextAlignProc(SkPaint::Align align)
: fAlign(align) {
}
// Returns the glyph position, which may be rounded or not by the caller
// e.g. subpixel doesn't round.
void operator()(const SkPoint& loc, const SkGlyph& glyph, SkPoint* dst) {
if (SkPaint::kLeft_Align == fAlign) {
dst->set(loc.fX, loc.fY);
} else if (SkPaint::kCenter_Align == fAlign) {
dst->set(loc.fX - SkFloatToScalar(glyph.fAdvanceX) / 2,
loc.fY - SkFloatToScalar(glyph.fAdvanceY) / 2);
} else {
SkASSERT(SkPaint::kRight_Align == fAlign);
dst->set(loc.fX - SkFloatToScalar(glyph.fAdvanceX),
loc.fY - SkFloatToScalar(glyph.fAdvanceY));
}
}
private:
const SkPaint::Align fAlign;
};
#endif
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