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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkTextToPathIter_DEFINED
#define SkTextToPathIter_DEFINED
#include "SkAutoKern.h"
#include "SkPaint.h"
class SkGlyphCache;
class SkTextBaseIter {
protected:
SkTextBaseIter(const char text[], size_t length, const SkPaint& paint,
bool applyStrokeAndPathEffects);
~SkTextBaseIter();
SkGlyphCache* fCache;
SkPaint fPaint;
SkScalar fScale;
SkScalar fPrevAdvance;
const char* fText;
const char* fStop;
SkPaint::GlyphCacheProc fGlyphCacheProc;
SkScalar fXPos; // accumulated xpos, returned in next
SkAutoKern fAutoKern;
int fXYIndex; // cache for horizontal -vs- vertical text
};
class SkTextToPathIter : SkTextBaseIter {
public:
SkTextToPathIter(const char text[], size_t length, const SkPaint& paint,
bool applyStrokeAndPathEffects)
: SkTextBaseIter(text, length, paint, applyStrokeAndPathEffects) {
}
const SkPaint& getPaint() const { return fPaint; }
SkScalar getPathScale() const { return fScale; }
/**
* Returns false when all of the text has been consumed
*/
bool next(const SkPath** path, SkScalar* xpos);
};
class SkTextInterceptsIter : SkTextBaseIter {
public:
enum class TextType {
kText,
kPosText
};
SkTextInterceptsIter(const char text[], size_t length, const SkPaint& paint,
const SkScalar bounds[2], SkScalar x, SkScalar y, TextType textType)
: SkTextBaseIter(text, length, paint, false)
, fTextType(textType) {
fBoundsBase[0] = bounds[0];
fBoundsBase[1] = bounds[1];
this->setPosition(x, y);
}
/**
* Returns false when all of the text has been consumed
*/
bool next(SkScalar* array, int* count);
void setPosition(SkScalar x, SkScalar y) {
SkScalar xOffset = TextType::kText == fTextType && fXYIndex ? fXPos : 0;
if (TextType::kPosText == fTextType
&& fPaint.getTextAlign() != SkPaint::kLeft_Align) { // need to measure first
const char* text = fText;
const SkGlyph& glyph = fGlyphCacheProc(fCache, &text);
SkScalar width = (&glyph.fAdvanceX)[0] * fScale;
if (fPaint.getTextAlign() == SkPaint::kCenter_Align) {
width = SkScalarHalf(width);
}
xOffset = width;
}
for (int i = 0; i < (int) SK_ARRAY_COUNT(fBounds); ++i) {
SkScalar bound = fBoundsBase[i] - (fXYIndex ? x : y);
if (fXYIndex) {
bound += xOffset;
}
fBounds[i] = bound / fScale;
}
fXPos = xOffset + (fXYIndex ? y : x);
fPrevAdvance = 0;
}
private:
SkScalar fBounds[2];
SkScalar fBoundsBase[2];
TextType fTextType;
};
#endif
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