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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.
*/
#include "SkStrokeRec.h"
#include "SkPaintDefaults.h"
// must be < 0, since ==0 means hairline, and >0 means normal stroke
#define kStrokeRec_FillStyleWidth (-SK_Scalar1)
SkStrokeRec::SkStrokeRec(InitStyle s) {
fResScale = 1;
fWidth = (kFill_InitStyle == s) ? kStrokeRec_FillStyleWidth : 0;
fMiterLimit = SkPaintDefaults_MiterLimit;
fCap = SkPaint::kDefault_Cap;
fJoin = SkPaint::kDefault_Join;
fStrokeAndFill = false;
}
SkStrokeRec::SkStrokeRec(const SkPaint& paint, SkScalar resScale) {
this->init(paint, paint.getStyle(), resScale);
}
SkStrokeRec::SkStrokeRec(const SkPaint& paint, SkPaint::Style styleOverride, SkScalar resScale) {
this->init(paint, styleOverride, resScale);
}
void SkStrokeRec::init(const SkPaint& paint, SkPaint::Style style, SkScalar resScale) {
fResScale = resScale;
switch (style) {
case SkPaint::kFill_Style:
fWidth = kStrokeRec_FillStyleWidth;
fStrokeAndFill = false;
break;
case SkPaint::kStroke_Style:
fWidth = paint.getStrokeWidth();
fStrokeAndFill = false;
break;
case SkPaint::kStrokeAndFill_Style:
if (0 == paint.getStrokeWidth()) {
// hairline+fill == fill
fWidth = kStrokeRec_FillStyleWidth;
fStrokeAndFill = false;
} else {
fWidth = paint.getStrokeWidth();
fStrokeAndFill = true;
}
break;
default:
SkDEBUGFAIL("unknown paint style");
// fall back on just fill
fWidth = kStrokeRec_FillStyleWidth;
fStrokeAndFill = false;
break;
}
// copy these from the paint, regardless of our "style"
fMiterLimit = paint.getStrokeMiter();
fCap = paint.getStrokeCap();
fJoin = paint.getStrokeJoin();
}
SkStrokeRec::Style SkStrokeRec::getStyle() const {
if (fWidth < 0) {
return kFill_Style;
} else if (0 == fWidth) {
return kHairline_Style;
} else {
return fStrokeAndFill ? kStrokeAndFill_Style : kStroke_Style;
}
}
void SkStrokeRec::setFillStyle() {
fWidth = kStrokeRec_FillStyleWidth;
fStrokeAndFill = false;
}
void SkStrokeRec::setHairlineStyle() {
fWidth = 0;
fStrokeAndFill = false;
}
void SkStrokeRec::setStrokeStyle(SkScalar width, bool strokeAndFill) {
if (strokeAndFill && (0 == width)) {
// hairline+fill == fill
this->setFillStyle();
} else {
fWidth = width;
fStrokeAndFill = strokeAndFill;
}
}
#include "SkStroke.h"
#ifdef SK_DEBUG
// enables tweaking these values at runtime from Viewer
bool gDebugStrokerErrorSet = false;
SkScalar gDebugStrokerError;
#endif
bool SkStrokeRec::applyToPath(SkPath* dst, const SkPath& src) const {
if (fWidth <= 0) { // hairline or fill
return false;
}
SkStroke stroker;
stroker.setCap((SkPaint::Cap)fCap);
stroker.setJoin((SkPaint::Join)fJoin);
stroker.setMiterLimit(fMiterLimit);
stroker.setWidth(fWidth);
stroker.setDoFill(fStrokeAndFill);
#ifdef SK_DEBUG
stroker.setResScale(gDebugStrokerErrorSet ? gDebugStrokerError : fResScale);
#else
stroker.setResScale(fResScale);
#endif
stroker.strokePath(src, dst);
return true;
}
void SkStrokeRec::applyToPaint(SkPaint* paint) const {
if (fWidth < 0) { // fill
paint->setStyle(SkPaint::kFill_Style);
return;
}
paint->setStyle(fStrokeAndFill ? SkPaint::kStrokeAndFill_Style : SkPaint::kStroke_Style);
paint->setStrokeWidth(fWidth);
paint->setStrokeMiter(fMiterLimit);
paint->setStrokeCap((SkPaint::Cap)fCap);
paint->setStrokeJoin((SkPaint::Join)fJoin);
}
static inline SkScalar get_inflation_bounds(SkPaint::Join join,
SkScalar miterLimit,
SkPaint::Cap cap,
SkScalar strokeWidth) {
if (strokeWidth < 0) { // fill
return 0;
} else if (0 == strokeWidth) {
// FIXME: We need a "matrixScale" parameter here in order to properly handle hairlines.
// Their with is determined in device space, unlike other strokes.
// http://skbug.com/8157
return SK_Scalar1;
}
// since we're stroked, outset the rect by the radius (and join type, caps)
SkScalar multiplier = SK_Scalar1;
if (SkPaint::kMiter_Join == join) {
multiplier = SkTMax(multiplier, miterLimit);
}
if (SkPaint::kSquare_Cap == cap) {
multiplier = SkTMax(multiplier, SK_ScalarSqrt2);
}
return strokeWidth/2 * multiplier;
}
SkScalar SkStrokeRec::getInflationRadius() const {
return get_inflation_bounds((SkPaint::Join)fJoin, fMiterLimit, (SkPaint::Cap)fCap, fWidth);
}
SkScalar SkStrokeRec::GetInflationRadius(const SkPaint& paint, SkPaint::Style style) {
SkScalar width = SkPaint::kFill_Style == style ? -SK_Scalar1 : paint.getStrokeWidth();
return get_inflation_bounds(paint.getStrokeJoin(), paint.getStrokeMiter(), paint.getStrokeCap(),
width);
}
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