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#include "SkCanvas.h"
#include "SkLayerDrawLooper.h"
#include "SkPaint.h"
SkLayerDrawLooper::SkLayerDrawLooper() {
fRecs = NULL;
fCount = 0;
}
SkLayerDrawLooper::~SkLayerDrawLooper() {
Rec* rec = fRecs;
while (rec) {
Rec* next = rec->fNext;
SkDELETE(rec);
rec = next;
}
}
SkPaint* SkLayerDrawLooper::addLayer(SkScalar dx, SkScalar dy) {
fCount += 1;
Rec* rec = SkNEW(Rec);
rec->fNext = fRecs;
rec->fOffset.set(dx, dy);
fRecs = rec;
return &rec->fPaint;
}
void SkLayerDrawLooper::init(SkCanvas* canvas, SkPaint* paint) {
fIter.fSavedPaint = *paint;
fIter.fPaint = paint;
fIter.fCanvas = canvas;
fIter.fRec = fRecs;
canvas->save(SkCanvas::kMatrix_SaveFlag);
}
bool SkLayerDrawLooper::next() {
Rec* rec = fIter.fRec;
if (rec) {
*fIter.fPaint = rec->fPaint;
fIter.fCanvas->restore();
fIter.fCanvas->save(SkCanvas::kMatrix_SaveFlag);
fIter.fCanvas->translate(rec->fOffset.fX, rec->fOffset.fY);
fIter.fRec = rec->fNext;
return true;
}
return false;
}
void SkLayerDrawLooper::restore() {
fIter.fCanvas->restore();
*fIter.fPaint = fIter.fSavedPaint;
}
SkLayerDrawLooper::Rec* SkLayerDrawLooper::Rec::Reverse(Rec* head) {
Rec* rec = head;
Rec* prev = NULL;
while (rec) {
Rec* next = rec->fNext;
rec->fNext = prev;
prev = rec;
rec = next;
}
return prev;
}
///////////////////////////////////////////////////////////////////////////////
void SkLayerDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) {
this->INHERITED::flatten(buffer);
#ifdef SK_DEBUG
{
Rec* rec = fRecs;
int count = 0;
while (rec) {
rec = rec->fNext;
count += 1;
}
SkASSERT(count == fCount);
}
#endif
buffer.writeInt(fCount);
Rec* rec = fRecs;
for (int i = 0; i < fCount; i++) {
buffer.writeScalar(rec->fOffset.fX);
buffer.writeScalar(rec->fOffset.fY);
rec->fPaint.flatten(buffer);
rec = rec->fNext;
}
}
SkLayerDrawLooper::SkLayerDrawLooper(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fRecs = NULL;
fCount = 0;
int count = buffer.readInt();
for (int i = 0; i < count; i++) {
SkScalar dx = buffer.readScalar();
SkScalar dy = buffer.readScalar();
this->addLayer(dx, dy)->unflatten(buffer);
}
SkASSERT(count == fCount);
// we're in reverse order, so fix it now
fRecs = Rec::Reverse(fRecs);
#ifdef SK_DEBUG
{
Rec* rec = fRecs;
int n = 0;
while (rec) {
rec = rec->fNext;
n += 1;
}
SkASSERT(count == n);
}
#endif
}
///////////////////////////////////////////////////////////////////////////////
static SkFlattenable::Registrar gReg("SkLayerDrawLooper",
SkLayerDrawLooper::CreateProc);
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