/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrWindowRectangles_DEFINED
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#define GrWindowRectangles_DEFINED
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#include "GrNonAtomicRef.h"
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#include "SkRect.h"
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class GrWindowRectangles {
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public:
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constexpr static int kMaxWindows = 8;
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GrWindowRectangles() : fCount(0) {}
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GrWindowRectangles(const GrWindowRectangles& that) : fCount(0) { *this = that; }
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~GrWindowRectangles() { SkSafeUnref(this->rec()); }
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GrWindowRectangles makeOffset(int dx, int dy) const;
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bool empty() const { return !fCount; }
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int count() const { return fCount; }
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const SkIRect* data() const;
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void reset();
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GrWindowRectangles& operator=(const GrWindowRectangles&);
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SkIRect& addWindow(const SkIRect& window) { return this->addWindow() = window; }
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SkIRect& addWindow();
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bool operator!=(const GrWindowRectangles& that) const { return !(*this == that); }
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bool operator==(const GrWindowRectangles&) const;
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private:
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constexpr static int kNumLocalWindows = 1;
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struct Rec;
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const Rec* rec() const { return fCount <= kNumLocalWindows ? nullptr : fRec; }
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int fCount;
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union {
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SkIRect fLocalWindows[kNumLocalWindows]; // If fCount <= kNumLocalWindows.
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Rec* fRec; // If fCount > kNumLocalWindows.
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};
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};
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struct GrWindowRectangles::Rec : public GrNonAtomicRef<Rec> {
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Rec(const SkIRect* windows, int numWindows) {
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SkASSERT(numWindows < kMaxWindows);
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memcpy(fData, windows, sizeof(SkIRect) * numWindows);
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}
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Rec() = default;
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SkIRect fData[kMaxWindows];
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};
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inline const SkIRect* GrWindowRectangles::data() const {
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return fCount <= kNumLocalWindows ? fLocalWindows : fRec->fData;
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}
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inline void GrWindowRectangles::reset() {
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SkSafeUnref(this->rec());
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fCount = 0;
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}
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inline GrWindowRectangles& GrWindowRectangles::operator=(const GrWindowRectangles& that) {
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SkSafeUnref(this->rec());
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fCount = that.fCount;
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if (fCount <= kNumLocalWindows) {
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memcpy(fLocalWindows, that.fLocalWindows, fCount * sizeof(SkIRect));
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} else {
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fRec = SkRef(that.fRec);
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}
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return *this;
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}
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inline GrWindowRectangles GrWindowRectangles::makeOffset(int dx, int dy) const {
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if (!dx && !dy) {
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return *this;
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}
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GrWindowRectangles result;
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result.fCount = fCount;
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SkIRect* windows;
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if (result.fCount > kNumLocalWindows) {
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result.fRec = new Rec();
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windows = result.fRec->fData;
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} else {
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windows = result.fLocalWindows;
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}
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for (int i = 0; i < fCount; ++i) {
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windows[i] = this->data()[i].makeOffset(dx, dy);
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}
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return result;
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}
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inline SkIRect& GrWindowRectangles::addWindow() {
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SkASSERT(fCount < kMaxWindows);
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if (fCount < kNumLocalWindows) {
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return fLocalWindows[fCount++];
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}
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if (fCount == kNumLocalWindows) {
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fRec = new Rec(fLocalWindows, kNumLocalWindows);
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} else if (!fRec->unique()) { // Simple copy-on-write.
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fRec->unref();
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fRec = new Rec(fRec->fData, fCount);
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}
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return fRec->fData[fCount++];
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}
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inline bool GrWindowRectangles::operator==(const GrWindowRectangles& that) const {
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if (fCount != that.fCount) {
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return false;
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}
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if (fCount > kNumLocalWindows && fRec == that.fRec) {
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return true;
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}
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return !fCount || !memcmp(this->data(), that.data(), sizeof(SkIRect) * fCount);
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}
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#endif
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