| /* |
| * 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 "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| #include "SkLayerDrawLooper.h" |
| #include "SkString.h" |
| #include "SkStringUtils.h" |
| #include "SkUnPreMultiply.h" |
| |
| SkLayerDrawLooper::LayerInfo::LayerInfo() { |
| fPaintBits = 0; // ignore our paint fields |
| fColorMode = SkXfermode::kDst_Mode; // ignore our color |
| fOffset.set(0, 0); |
| fPostTranslate = false; |
| } |
| |
| SkLayerDrawLooper::SkLayerDrawLooper() |
| : fRecs(nullptr), |
| fCount(0) { |
| } |
| |
| SkLayerDrawLooper::~SkLayerDrawLooper() { |
| Rec* rec = fRecs; |
| while (rec) { |
| Rec* next = rec->fNext; |
| delete rec; |
| rec = next; |
| } |
| } |
| |
| SkLayerDrawLooper::Context* SkLayerDrawLooper::createContext(SkCanvas* canvas, void* storage) const { |
| canvas->save(); |
| return new (storage) LayerDrawLooperContext(this); |
| } |
| |
| 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::LayerDrawLooperContext::ApplyInfo( |
| SkPaint* dst, const SkPaint& src, const LayerInfo& info) { |
| |
| 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(sk_ref_sp(src.getPathEffect())); |
| } |
| if (bits & kMaskFilter_Bit) { |
| dst->setMaskFilter(sk_ref_sp(src.getMaskFilter())); |
| } |
| if (bits & kShader_Bit) { |
| dst->setShader(sk_ref_sp(src.getShader())); |
| } |
| if (bits & kColorFilter_Bit) { |
| dst->setColorFilter(sk_ref_sp(src.getColorFilter())); |
| } |
| if (bits & kXfermode_Bit) { |
| dst->setXfermode(sk_ref_sp(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); |
| } |
| |
| SkLayerDrawLooper::LayerDrawLooperContext::LayerDrawLooperContext( |
| const SkLayerDrawLooper* looper) : fCurrRec(looper->fRecs) {} |
| |
| bool SkLayerDrawLooper::LayerDrawLooperContext::next(SkCanvas* canvas, |
| SkPaint* paint) { |
| canvas->restore(); |
| if (nullptr == fCurrRec) { |
| return false; |
| } |
| |
| ApplyInfo(paint, fCurrRec->fPaint, fCurrRec->fInfo); |
| |
| canvas->save(); |
| 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; |
| } |
| |
| bool SkLayerDrawLooper::asABlurShadow(BlurShadowRec* bsRec) const { |
| if (fCount != 2) { |
| return false; |
| } |
| const Rec* rec = fRecs; |
| |
| // bottom layer needs to be just blur(maskfilter) |
| if ((rec->fInfo.fPaintBits & ~kMaskFilter_Bit)) { |
| return false; |
| } |
| if (SkXfermode::kSrc_Mode != rec->fInfo.fColorMode) { |
| return false; |
| } |
| const SkMaskFilter* mf = rec->fPaint.getMaskFilter(); |
| if (nullptr == mf) { |
| return false; |
| } |
| SkMaskFilter::BlurRec maskBlur; |
| if (!mf->asABlur(&maskBlur)) { |
| return false; |
| } |
| |
| rec = rec->fNext; |
| // top layer needs to be "plain" |
| if (rec->fInfo.fPaintBits) { |
| return false; |
| } |
| if (SkXfermode::kDst_Mode != rec->fInfo.fColorMode) { |
| return false; |
| } |
| if (!rec->fInfo.fOffset.equals(0, 0)) { |
| return false; |
| } |
| |
| if (bsRec) { |
| bsRec->fSigma = maskBlur.fSigma; |
| bsRec->fOffset = fRecs->fInfo.fOffset; |
| bsRec->fColor = fRecs->fPaint.getColor(); |
| bsRec->fStyle = maskBlur.fStyle; |
| bsRec->fQuality = maskBlur.fQuality; |
| } |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkLayerDrawLooper::flatten(SkWriteBuffer& buffer) const { |
| buffer.writeInt(fCount); |
| |
| Rec* rec = fRecs; |
| for (int i = 0; i < fCount; i++) { |
| // Legacy "flagsmask" field -- now ignored, remove when we bump version |
| buffer.writeInt(0); |
| |
| buffer.writeInt(rec->fInfo.fPaintBits); |
| buffer.writeInt(rec->fInfo.fColorMode); |
| buffer.writePoint(rec->fInfo.fOffset); |
| buffer.writeBool(rec->fInfo.fPostTranslate); |
| buffer.writePaint(rec->fPaint); |
| rec = rec->fNext; |
| } |
| } |
| |
| sk_sp<SkFlattenable> SkLayerDrawLooper::CreateProc(SkReadBuffer& buffer) { |
| int count = buffer.readInt(); |
| |
| Builder builder; |
| for (int i = 0; i < count; i++) { |
| LayerInfo info; |
| // Legacy "flagsmask" field -- now ignored, remove when we bump version |
| (void)buffer.readInt(); |
| |
| info.fPaintBits = buffer.readInt(); |
| info.fColorMode = (SkXfermode::Mode)buffer.readInt(); |
| buffer.readPoint(&info.fOffset); |
| info.fPostTranslate = buffer.readBool(); |
| buffer.readPaint(builder.addLayerOnTop(info)); |
| } |
| return builder.detach(); |
| } |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkLayerDrawLooper::toString(SkString* str) const { |
| str->appendf("SkLayerDrawLooper (%d): ", fCount); |
| |
| Rec* rec = fRecs; |
| for (int i = 0; i < fCount; i++) { |
| str->appendf("%d: paintBits: (", i); |
| if (0 == rec->fInfo.fPaintBits) { |
| str->append("None"); |
| } else if (kEntirePaint_Bits == rec->fInfo.fPaintBits) { |
| str->append("EntirePaint"); |
| } else { |
| bool needSeparator = false; |
| SkAddFlagToString(str, SkToBool(kStyle_Bit & rec->fInfo.fPaintBits), "Style", |
| &needSeparator); |
| SkAddFlagToString(str, SkToBool(kTextSkewX_Bit & rec->fInfo.fPaintBits), "TextSkewX", |
| &needSeparator); |
| SkAddFlagToString(str, SkToBool(kPathEffect_Bit & rec->fInfo.fPaintBits), "PathEffect", |
| &needSeparator); |
| SkAddFlagToString(str, SkToBool(kMaskFilter_Bit & rec->fInfo.fPaintBits), "MaskFilter", |
| &needSeparator); |
| SkAddFlagToString(str, SkToBool(kShader_Bit & rec->fInfo.fPaintBits), "Shader", |
| &needSeparator); |
| SkAddFlagToString(str, SkToBool(kColorFilter_Bit & rec->fInfo.fPaintBits), "ColorFilter", |
| &needSeparator); |
| SkAddFlagToString(str, SkToBool(kXfermode_Bit & rec->fInfo.fPaintBits), "Xfermode", |
| &needSeparator); |
| } |
| str->append(") "); |
| |
| static const char* gModeStrings[SkXfermode::kLastMode+1] = { |
| "kClear", "kSrc", "kDst", "kSrcOver", "kDstOver", "kSrcIn", "kDstIn", |
| "kSrcOut", "kDstOut", "kSrcATop", "kDstATop", "kXor", "kPlus", |
| "kMultiply", "kScreen", "kOverlay", "kDarken", "kLighten", "kColorDodge", |
| "kColorBurn", "kHardLight", "kSoftLight", "kDifference", "kExclusion" |
| }; |
| |
| str->appendf("mode: %s ", gModeStrings[rec->fInfo.fColorMode]); |
| |
| str->append("offset: ("); |
| str->appendScalar(rec->fInfo.fOffset.fX); |
| str->append(", "); |
| str->appendScalar(rec->fInfo.fOffset.fY); |
| str->append(") "); |
| |
| str->append("postTranslate: "); |
| if (rec->fInfo.fPostTranslate) { |
| str->append("true "); |
| } else { |
| str->append("false "); |
| } |
| |
| rec->fPaint.toString(str); |
| rec = rec->fNext; |
| } |
| } |
| #endif |
| |
| SkLayerDrawLooper::Builder::Builder() |
| : fRecs(nullptr), |
| fTopRec(nullptr), |
| fCount(0) { |
| } |
| |
| SkLayerDrawLooper::Builder::~Builder() { |
| Rec* rec = fRecs; |
| while (rec) { |
| Rec* next = rec->fNext; |
| delete rec; |
| rec = next; |
| } |
| } |
| |
| SkPaint* SkLayerDrawLooper::Builder::addLayer(const LayerInfo& info) { |
| fCount += 1; |
| |
| Rec* rec = new Rec; |
| rec->fNext = fRecs; |
| rec->fInfo = info; |
| fRecs = rec; |
| if (nullptr == fTopRec) { |
| fTopRec = rec; |
| } |
| |
| return &rec->fPaint; |
| } |
| |
| void SkLayerDrawLooper::Builder::addLayer(SkScalar dx, SkScalar dy) { |
| LayerInfo info; |
| |
| info.fOffset.set(dx, dy); |
| (void)this->addLayer(info); |
| } |
| |
| SkPaint* SkLayerDrawLooper::Builder::addLayerOnTop(const LayerInfo& info) { |
| fCount += 1; |
| |
| Rec* rec = new Rec; |
| rec->fNext = nullptr; |
| rec->fInfo = info; |
| if (nullptr == fRecs) { |
| fRecs = rec; |
| } else { |
| SkASSERT(fTopRec); |
| fTopRec->fNext = rec; |
| } |
| fTopRec = rec; |
| |
| return &rec->fPaint; |
| } |
| |
| sk_sp<SkDrawLooper> SkLayerDrawLooper::Builder::detach() { |
| SkLayerDrawLooper* looper = new SkLayerDrawLooper; |
| looper->fCount = fCount; |
| looper->fRecs = fRecs; |
| |
| fCount = 0; |
| fRecs = nullptr; |
| fTopRec = nullptr; |
| |
| return sk_sp<SkDrawLooper>(looper); |
| } |
