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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkColor.h"
#include "SkLayerDrawLooper.h"
#include "SkPaint.h"
#include "SkUnPreMultiply.h"
SkLayerDrawLooper::LayerInfo::LayerInfo() {
fFlagsMask = 0; // ignore our paint flags
fPaintBits = 0; // ignore our paint fields
fColorMode = SkXfermode::kDst_Mode; // ignore our color
fOffset.set(0, 0);
fPostTranslate = false;
}
SkLayerDrawLooper::SkLayerDrawLooper()
: fRecs(NULL),
fCount(0),
fCurrRec(NULL) {
}
SkLayerDrawLooper::~SkLayerDrawLooper() {
Rec* rec = fRecs;
while (rec) {
Rec* next = rec->fNext;
SkDELETE(rec);
rec = next;
}
}
SkPaint* SkLayerDrawLooper::addLayer(const LayerInfo& info) {
fCount += 1;
Rec* rec = SkNEW(Rec);
rec->fNext = fRecs;
rec->fInfo = info;
fRecs = rec;
return &rec->fPaint;
}
void SkLayerDrawLooper::addLayer(SkScalar dx, SkScalar dy) {
LayerInfo info;
info.fOffset.set(dx, dy);
(void)this->addLayer(info);
}
void SkLayerDrawLooper::init(SkCanvas* canvas) {
fCurrRec = fRecs;
canvas->save(SkCanvas::kMatrix_SaveFlag);
}
static SkColor xferColor(SkColor src, SkColor dst, SkXfermode::Mode mode) {
switch (mode) {
case SkXfermode::kSrc_Mode:
return src;
case SkXfermode::kDst_Mode:
return dst;
default: {
SkPMColor pmS = SkPreMultiplyColor(src);
SkPMColor pmD = SkPreMultiplyColor(dst);
SkPMColor result = SkXfermode::GetProc(mode)(pmS, pmD);
return SkUnPreMultiply::PMColorToColor(result);
}
}
}
// Even with kEntirePaint_Bits, we always ensure that the master paint's
// text-encoding is respected, since that controls how we interpret the
// text/length parameters of a draw[Pos]Text call.
void SkLayerDrawLooper::ApplyInfo(SkPaint* dst, const SkPaint& src,
const LayerInfo& info) {
uint32_t mask = info.fFlagsMask;
dst->setFlags((dst->getFlags() & ~mask) | (src.getFlags() & mask));
dst->setColor(xferColor(src.getColor(), dst->getColor(), info.fColorMode));
BitFlags bits = info.fPaintBits;
SkPaint::TextEncoding encoding = dst->getTextEncoding();
if (0 == bits) {
return;
}
if (kEntirePaint_Bits == bits) {
// we've already computed these, so save it from the assignment
uint32_t f = dst->getFlags();
SkColor c = dst->getColor();
*dst = src;
dst->setFlags(f);
dst->setColor(c);
dst->setTextEncoding(encoding);
return;
}
if (bits & kStyle_Bit) {
dst->setStyle(src.getStyle());
dst->setStrokeWidth(src.getStrokeWidth());
dst->setStrokeMiter(src.getStrokeMiter());
dst->setStrokeCap(src.getStrokeCap());
dst->setStrokeJoin(src.getStrokeJoin());
}
if (bits & kTextSkewX_Bit) {
dst->setTextSkewX(src.getTextSkewX());
}
if (bits & kPathEffect_Bit) {
dst->setPathEffect(src.getPathEffect());
}
if (bits & kMaskFilter_Bit) {
dst->setMaskFilter(src.getMaskFilter());
}
if (bits & kShader_Bit) {
dst->setShader(src.getShader());
}
if (bits & kColorFilter_Bit) {
dst->setColorFilter(src.getColorFilter());
}
if (bits & kXfermode_Bit) {
dst->setXfermode(src.getXfermode());
}
// we don't override these
#if 0
dst->setTypeface(src.getTypeface());
dst->setTextSize(src.getTextSize());
dst->setTextScaleX(src.getTextScaleX());
dst->setRasterizer(src.getRasterizer());
dst->setLooper(src.getLooper());
dst->setTextEncoding(src.getTextEncoding());
dst->setHinting(src.getHinting());
#endif
}
// Should we add this to canvas?
static void postTranslate(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
SkMatrix m = canvas->getTotalMatrix();
m.postTranslate(dx, dy);
canvas->setMatrix(m);
}
bool SkLayerDrawLooper::next(SkCanvas* canvas, SkPaint* paint) {
canvas->restore();
if (NULL == fCurrRec) {
return false;
}
ApplyInfo(paint, fCurrRec->fPaint, fCurrRec->fInfo);
canvas->save(SkCanvas::kMatrix_SaveFlag);
if (fCurrRec->fInfo.fPostTranslate) {
postTranslate(canvas, fCurrRec->fInfo.fOffset.fX,
fCurrRec->fInfo.fOffset.fY);
} else {
canvas->translate(fCurrRec->fInfo.fOffset.fX, fCurrRec->fInfo.fOffset.fY);
}
fCurrRec = fCurrRec->fNext;
return true;
}
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) const {
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.writeInt(rec->fInfo.fPaintBits);
buffer.writeInt(rec->fInfo.fColorMode);
buffer.writeScalar(rec->fInfo.fOffset.fX);
buffer.writeScalar(rec->fInfo.fOffset.fY);
buffer.writeBool(rec->fInfo.fPostTranslate);
rec->fPaint.flatten(buffer);
rec = rec->fNext;
}
}
SkLayerDrawLooper::SkLayerDrawLooper(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer),
fRecs(NULL),
fCount(0),
fCurrRec(NULL) {
int count = buffer.readInt();
for (int i = 0; i < count; i++) {
LayerInfo info;
info.fPaintBits = buffer.readInt();
info.fColorMode = (SkXfermode::Mode)buffer.readInt();
info.fOffset.fX = buffer.readScalar();
info.fOffset.fY = buffer.readScalar();
info.fPostTranslate = buffer.readBool();
this->addLayer(info)->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
}
///////////////////////////////////////////////////////////////////////////////
SK_DEFINE_FLATTENABLE_REGISTRAR(SkLayerDrawLooper)
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