blob: d1b3f748c655cbbd80b3a7e9478e277652bd73fc [file] [log] [blame]
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkRasterClipStack_DEFINED
#define SkRasterClipStack_DEFINED
#include "include/core/SkClipOp.h"
#include "src/base/SkTBlockList.h"
#include "src/core/SkRasterClip.h"
#include "src/core/SkScan.h"
class SkRasterClipStack : SkNoncopyable {
public:
SkRasterClipStack(int width, int height)
: fRootBounds(SkIRect::MakeWH(width, height))
, fDisableAA(SkScan::DowngradeClipAA(fRootBounds)) {
fStack.emplace_back(SkRasterClip(fRootBounds));
SkASSERT(fStack.count() == 1);
}
void setNewSize(int w, int h) {
fRootBounds.setXYWH(0, 0, w, h);
SkASSERT(fStack.count() == 1);
Rec& rec = fStack.back();
SkASSERT(rec.fDeferredCount == 0);
rec.fRC.setRect(fRootBounds);
}
const SkRasterClip& rc() const { return fStack.back().fRC; }
void save() {
SkDEBUGCODE(fCounter += 1);
SkASSERT(fStack.back().fDeferredCount >= 0);
fStack.back().fDeferredCount += 1;
}
void restore() {
SkDEBUGCODE(fCounter -= 1);
SkASSERT(fCounter >= 0);
if (--fStack.back().fDeferredCount < 0) {
SkASSERT(fStack.back().fDeferredCount == -1);
SkASSERT(fStack.count() > 1);
fStack.pop_back();
}
}
void clipRect(const SkMatrix& ctm, const SkRect& rect, SkClipOp op, bool aa) {
this->writable_rc().op(rect, ctm, op, this->finalAA(aa));
this->validate();
}
void clipRRect(const SkMatrix& ctm, const SkRRect& rrect, SkClipOp op, bool aa) {
this->writable_rc().op(rrect, ctm, op, this->finalAA(aa));
this->validate();
}
void clipPath(const SkMatrix& ctm, const SkPath& path, SkClipOp op, bool aa) {
this->writable_rc().op(path, ctm, op, this->finalAA(aa));
this->validate();
}
void clipShader(sk_sp<SkShader> sh) {
this->writable_rc().op(std::move(sh));
this->validate();
}
void clipRegion(const SkRegion& rgn, SkClipOp op) {
this->writable_rc().op(rgn, op);
this->validate();
}
void replaceClip(const SkIRect& rect) {
SkIRect devRect = rect;
if (!devRect.intersect(fRootBounds)) {
this->writable_rc().setEmpty();
} else {
this->writable_rc().setRect(devRect);
}
}
void validate() const {
#ifdef SK_DEBUG
const SkRasterClip& clip = this->rc();
if (fRootBounds.isEmpty()) {
SkASSERT(clip.isEmpty());
} else if (!clip.isEmpty()) {
SkASSERT(fRootBounds.contains(clip.getBounds()));
}
#endif
}
private:
struct Rec {
SkRasterClip fRC;
int fDeferredCount; // 0 for a "normal" entry
Rec(const SkRasterClip& rc) : fRC(rc), fDeferredCount(0) {}
};
SkTBlockList<Rec, 16> fStack;
SkIRect fRootBounds;
bool fDisableAA;
SkDEBUGCODE(int fCounter = 0);
SkRasterClip& writable_rc() {
SkASSERT(fStack.back().fDeferredCount >= 0);
if (fStack.back().fDeferredCount > 0) {
fStack.back().fDeferredCount -= 1;
fStack.emplace_back(fStack.back().fRC);
}
return fStack.back().fRC;
}
bool finalAA(bool aa) const { return aa && !fDisableAA; }
};
#endif