3 * Copyright 2011 Google Inc.
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
10 #include "SkReadBuffer.h"
11 #include "SkWriteBuffer.h"
12 #include "SkLayerDrawLooper.h"
14 #include "SkStringUtils.h"
15 #include "SkUnPreMultiply.h"
17 SkLayerDrawLooper::LayerInfo::LayerInfo() {
18 fPaintBits = 0; // ignore our paint fields
19 fColorMode = SkXfermode::kDst_Mode; // ignore our color
21 fPostTranslate = false;
24 SkLayerDrawLooper::SkLayerDrawLooper()
30 SkLayerDrawLooper::~SkLayerDrawLooper() {
33 Rec* next = rec->fNext;
39 SkLayerDrawLooper::Context* SkLayerDrawLooper::createContext(SkCanvas* canvas, void* storage) const {
41 return SkNEW_PLACEMENT_ARGS(storage, LayerDrawLooperContext, (this));
44 static SkColor xferColor(SkColor src, SkColor dst, SkXfermode::Mode mode) {
46 case SkXfermode::kSrc_Mode:
48 case SkXfermode::kDst_Mode:
51 SkPMColor pmS = SkPreMultiplyColor(src);
52 SkPMColor pmD = SkPreMultiplyColor(dst);
53 SkPMColor result = SkXfermode::GetProc(mode)(pmS, pmD);
54 return SkUnPreMultiply::PMColorToColor(result);
59 // Even with kEntirePaint_Bits, we always ensure that the master paint's
60 // text-encoding is respected, since that controls how we interpret the
61 // text/length parameters of a draw[Pos]Text call.
62 void SkLayerDrawLooper::LayerDrawLooperContext::ApplyInfo(
63 SkPaint* dst, const SkPaint& src, const LayerInfo& info) {
65 dst->setColor(xferColor(src.getColor(), dst->getColor(), info.fColorMode));
67 BitFlags bits = info.fPaintBits;
68 SkPaint::TextEncoding encoding = dst->getTextEncoding();
73 if (kEntirePaint_Bits == bits) {
74 // we've already computed these, so save it from the assignment
75 uint32_t f = dst->getFlags();
76 SkColor c = dst->getColor();
80 dst->setTextEncoding(encoding);
84 if (bits & kStyle_Bit) {
85 dst->setStyle(src.getStyle());
86 dst->setStrokeWidth(src.getStrokeWidth());
87 dst->setStrokeMiter(src.getStrokeMiter());
88 dst->setStrokeCap(src.getStrokeCap());
89 dst->setStrokeJoin(src.getStrokeJoin());
92 if (bits & kTextSkewX_Bit) {
93 dst->setTextSkewX(src.getTextSkewX());
96 if (bits & kPathEffect_Bit) {
97 dst->setPathEffect(src.getPathEffect());
99 if (bits & kMaskFilter_Bit) {
100 dst->setMaskFilter(src.getMaskFilter());
102 if (bits & kShader_Bit) {
103 dst->setShader(src.getShader());
105 if (bits & kColorFilter_Bit) {
106 dst->setColorFilter(src.getColorFilter());
108 if (bits & kXfermode_Bit) {
109 dst->setXfermode(src.getXfermode());
112 // we don't override these
114 dst->setTypeface(src.getTypeface());
115 dst->setTextSize(src.getTextSize());
116 dst->setTextScaleX(src.getTextScaleX());
117 dst->setRasterizer(src.getRasterizer());
118 dst->setLooper(src.getLooper());
119 dst->setTextEncoding(src.getTextEncoding());
120 dst->setHinting(src.getHinting());
124 // Should we add this to canvas?
125 static void postTranslate(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
126 SkMatrix m = canvas->getTotalMatrix();
127 m.postTranslate(dx, dy);
128 canvas->setMatrix(m);
131 SkLayerDrawLooper::LayerDrawLooperContext::LayerDrawLooperContext(
132 const SkLayerDrawLooper* looper) : fCurrRec(looper->fRecs) {}
134 bool SkLayerDrawLooper::LayerDrawLooperContext::next(SkCanvas* canvas,
137 if (NULL == fCurrRec) {
141 ApplyInfo(paint, fCurrRec->fPaint, fCurrRec->fInfo);
144 if (fCurrRec->fInfo.fPostTranslate) {
145 postTranslate(canvas, fCurrRec->fInfo.fOffset.fX,
146 fCurrRec->fInfo.fOffset.fY);
148 canvas->translate(fCurrRec->fInfo.fOffset.fX,
149 fCurrRec->fInfo.fOffset.fY);
151 fCurrRec = fCurrRec->fNext;
156 bool SkLayerDrawLooper::asABlurShadow(BlurShadowRec* bsRec) const {
160 const Rec* rec = fRecs;
162 // bottom layer needs to be just blur(maskfilter)
163 if ((rec->fInfo.fPaintBits & ~kMaskFilter_Bit)) {
166 if (SkXfermode::kSrc_Mode != rec->fInfo.fColorMode) {
169 const SkMaskFilter* mf = rec->fPaint.getMaskFilter();
173 SkMaskFilter::BlurRec maskBlur;
174 if (!mf->asABlur(&maskBlur)) {
179 // top layer needs to be "plain"
180 if (rec->fInfo.fPaintBits) {
183 if (SkXfermode::kDst_Mode != rec->fInfo.fColorMode) {
186 if (!rec->fInfo.fOffset.equals(0, 0)) {
191 bsRec->fSigma = maskBlur.fSigma;
192 bsRec->fOffset = fRecs->fInfo.fOffset;
193 bsRec->fColor = fRecs->fPaint.getColor();
194 bsRec->fStyle = maskBlur.fStyle;
195 bsRec->fQuality = maskBlur.fQuality;
200 ///////////////////////////////////////////////////////////////////////////////
202 void SkLayerDrawLooper::flatten(SkWriteBuffer& buffer) const {
203 this->INHERITED::flatten(buffer);
213 SkASSERT(count == fCount);
217 buffer.writeInt(fCount);
220 for (int i = 0; i < fCount; i++) {
221 // Legacy "flagsmask" field -- now ignored, remove when we bump version
224 buffer.writeInt(rec->fInfo.fPaintBits);
225 buffer.writeInt(rec->fInfo.fColorMode);
226 buffer.writePoint(rec->fInfo.fOffset);
227 buffer.writeBool(rec->fInfo.fPostTranslate);
228 buffer.writePaint(rec->fPaint);
233 SkFlattenable* SkLayerDrawLooper::CreateProc(SkReadBuffer& buffer) {
234 int count = buffer.readInt();
237 for (int i = 0; i < count; i++) {
239 // Legacy "flagsmask" field -- now ignored, remove when we bump version
240 (void)buffer.readInt();
242 info.fPaintBits = buffer.readInt();
243 info.fColorMode = (SkXfermode::Mode)buffer.readInt();
244 buffer.readPoint(&info.fOffset);
245 info.fPostTranslate = buffer.readBool();
246 buffer.readPaint(builder.addLayerOnTop(info));
248 SkLayerDrawLooper* looper = builder.detachLooper();
249 SkASSERT(count == looper->fCount);
253 Rec* rec = looper->fRecs;
259 SkASSERT(count == n);
266 #ifndef SK_IGNORE_TO_STRING
267 void SkLayerDrawLooper::toString(SkString* str) const {
268 str->appendf("SkLayerDrawLooper (%d): ", fCount);
271 for (int i = 0; i < fCount; i++) {
272 str->appendf("%d: paintBits: (", i);
273 if (0 == rec->fInfo.fPaintBits) {
275 } else if (kEntirePaint_Bits == rec->fInfo.fPaintBits) {
276 str->append("EntirePaint");
278 bool needSeparator = false;
279 SkAddFlagToString(str, SkToBool(kStyle_Bit & rec->fInfo.fPaintBits), "Style",
281 SkAddFlagToString(str, SkToBool(kTextSkewX_Bit & rec->fInfo.fPaintBits), "TextSkewX",
283 SkAddFlagToString(str, SkToBool(kPathEffect_Bit & rec->fInfo.fPaintBits), "PathEffect",
285 SkAddFlagToString(str, SkToBool(kMaskFilter_Bit & rec->fInfo.fPaintBits), "MaskFilter",
287 SkAddFlagToString(str, SkToBool(kShader_Bit & rec->fInfo.fPaintBits), "Shader",
289 SkAddFlagToString(str, SkToBool(kColorFilter_Bit & rec->fInfo.fPaintBits), "ColorFilter",
291 SkAddFlagToString(str, SkToBool(kXfermode_Bit & rec->fInfo.fPaintBits), "Xfermode",
296 static const char* gModeStrings[SkXfermode::kLastMode+1] = {
297 "kClear", "kSrc", "kDst", "kSrcOver", "kDstOver", "kSrcIn", "kDstIn",
298 "kSrcOut", "kDstOut", "kSrcATop", "kDstATop", "kXor", "kPlus",
299 "kMultiply", "kScreen", "kOverlay", "kDarken", "kLighten", "kColorDodge",
300 "kColorBurn", "kHardLight", "kSoftLight", "kDifference", "kExclusion"
303 str->appendf("mode: %s ", gModeStrings[rec->fInfo.fColorMode]);
305 str->append("offset: (");
306 str->appendScalar(rec->fInfo.fOffset.fX);
308 str->appendScalar(rec->fInfo.fOffset.fY);
311 str->append("postTranslate: ");
312 if (rec->fInfo.fPostTranslate) {
313 str->append("true ");
315 str->append("false ");
318 rec->fPaint.toString(str);
324 SkLayerDrawLooper::Builder::Builder()
330 SkLayerDrawLooper::Builder::~Builder() {
333 Rec* next = rec->fNext;
339 SkPaint* SkLayerDrawLooper::Builder::addLayer(const LayerInfo& info) {
342 Rec* rec = SkNEW(Rec);
346 if (NULL == fTopRec) {
353 void SkLayerDrawLooper::Builder::addLayer(SkScalar dx, SkScalar dy) {
356 info.fOffset.set(dx, dy);
357 (void)this->addLayer(info);
360 SkPaint* SkLayerDrawLooper::Builder::addLayerOnTop(const LayerInfo& info) {
363 Rec* rec = SkNEW(Rec);
369 SkASSERT(NULL != fTopRec);
370 fTopRec->fNext = rec;
377 SkLayerDrawLooper* SkLayerDrawLooper::Builder::detachLooper() {
378 SkLayerDrawLooper* looper = SkNEW(SkLayerDrawLooper);
379 looper->fCount = fCount;
380 looper->fRecs = fRecs;