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 "SkFlattenableBuffers.h"
11 #include "SkLayerDrawLooper.h"
13 #include "SkStringUtils.h"
14 #include "SkUnPreMultiply.h"
16 SK_DEFINE_INST_COUNT(SkLayerDrawLooper)
18 SkLayerDrawLooper::LayerInfo::LayerInfo() {
19 fFlagsMask = 0; // ignore our paint flags
20 fPaintBits = 0; // ignore our paint fields
21 fColorMode = SkXfermode::kDst_Mode; // ignore our color
23 fPostTranslate = false;
26 SkLayerDrawLooper::SkLayerDrawLooper()
33 SkLayerDrawLooper::~SkLayerDrawLooper() {
36 Rec* next = rec->fNext;
42 SkPaint* SkLayerDrawLooper::addLayer(const LayerInfo& info) {
45 Rec* rec = SkNEW(Rec);
49 if (NULL == fTopRec) {
56 void SkLayerDrawLooper::addLayer(SkScalar dx, SkScalar dy) {
59 info.fOffset.set(dx, dy);
60 (void)this->addLayer(info);
63 SkPaint* SkLayerDrawLooper::addLayerOnTop(const LayerInfo& info) {
66 Rec* rec = SkNEW(Rec);
72 SkASSERT(NULL != fTopRec);
80 void SkLayerDrawLooper::init(SkCanvas* canvas) {
82 canvas->save(SkCanvas::kMatrix_SaveFlag);
85 static SkColor xferColor(SkColor src, SkColor dst, SkXfermode::Mode mode) {
87 case SkXfermode::kSrc_Mode:
89 case SkXfermode::kDst_Mode:
92 SkPMColor pmS = SkPreMultiplyColor(src);
93 SkPMColor pmD = SkPreMultiplyColor(dst);
94 SkPMColor result = SkXfermode::GetProc(mode)(pmS, pmD);
95 return SkUnPreMultiply::PMColorToColor(result);
100 // Even with kEntirePaint_Bits, we always ensure that the master paint's
101 // text-encoding is respected, since that controls how we interpret the
102 // text/length parameters of a draw[Pos]Text call.
103 void SkLayerDrawLooper::ApplyInfo(SkPaint* dst, const SkPaint& src,
104 const LayerInfo& info) {
106 uint32_t mask = info.fFlagsMask;
107 dst->setFlags((dst->getFlags() & ~mask) | (src.getFlags() & mask));
108 dst->setColor(xferColor(src.getColor(), dst->getColor(), info.fColorMode));
110 BitFlags bits = info.fPaintBits;
111 SkPaint::TextEncoding encoding = dst->getTextEncoding();
116 if (kEntirePaint_Bits == bits) {
117 // we've already computed these, so save it from the assignment
118 uint32_t f = dst->getFlags();
119 SkColor c = dst->getColor();
123 dst->setTextEncoding(encoding);
127 if (bits & kStyle_Bit) {
128 dst->setStyle(src.getStyle());
129 dst->setStrokeWidth(src.getStrokeWidth());
130 dst->setStrokeMiter(src.getStrokeMiter());
131 dst->setStrokeCap(src.getStrokeCap());
132 dst->setStrokeJoin(src.getStrokeJoin());
135 if (bits & kTextSkewX_Bit) {
136 dst->setTextSkewX(src.getTextSkewX());
139 if (bits & kPathEffect_Bit) {
140 dst->setPathEffect(src.getPathEffect());
142 if (bits & kMaskFilter_Bit) {
143 dst->setMaskFilter(src.getMaskFilter());
145 if (bits & kShader_Bit) {
146 dst->setShader(src.getShader());
148 if (bits & kColorFilter_Bit) {
149 dst->setColorFilter(src.getColorFilter());
151 if (bits & kXfermode_Bit) {
152 dst->setXfermode(src.getXfermode());
155 // we don't override these
157 dst->setTypeface(src.getTypeface());
158 dst->setTextSize(src.getTextSize());
159 dst->setTextScaleX(src.getTextScaleX());
160 dst->setRasterizer(src.getRasterizer());
161 dst->setLooper(src.getLooper());
162 dst->setTextEncoding(src.getTextEncoding());
163 dst->setHinting(src.getHinting());
167 // Should we add this to canvas?
168 static void postTranslate(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
169 SkMatrix m = canvas->getTotalMatrix();
170 m.postTranslate(dx, dy);
171 canvas->setMatrix(m);
174 bool SkLayerDrawLooper::next(SkCanvas* canvas, SkPaint* paint) {
176 if (NULL == fCurrRec) {
180 ApplyInfo(paint, fCurrRec->fPaint, fCurrRec->fInfo);
182 canvas->save(SkCanvas::kMatrix_SaveFlag);
183 if (fCurrRec->fInfo.fPostTranslate) {
184 postTranslate(canvas, fCurrRec->fInfo.fOffset.fX,
185 fCurrRec->fInfo.fOffset.fY);
187 canvas->translate(fCurrRec->fInfo.fOffset.fX, fCurrRec->fInfo.fOffset.fY);
189 fCurrRec = fCurrRec->fNext;
194 ///////////////////////////////////////////////////////////////////////////////
196 void SkLayerDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const {
197 this->INHERITED::flatten(buffer);
207 SkASSERT(count == fCount);
211 buffer.writeInt(fCount);
214 for (int i = 0; i < fCount; i++) {
215 buffer.writeInt(rec->fInfo.fFlagsMask);
216 buffer.writeInt(rec->fInfo.fPaintBits);
217 buffer.writeInt(rec->fInfo.fColorMode);
218 buffer.writePoint(rec->fInfo.fOffset);
219 buffer.writeBool(rec->fInfo.fPostTranslate);
220 buffer.writePaint(rec->fPaint);
225 SkLayerDrawLooper::SkLayerDrawLooper(SkFlattenableReadBuffer& buffer)
231 int count = buffer.readInt();
233 for (int i = 0; i < count; i++) {
235 info.fFlagsMask = buffer.readInt();
236 info.fPaintBits = buffer.readInt();
237 info.fColorMode = (SkXfermode::Mode)buffer.readInt();
238 buffer.readPoint(&info.fOffset);
239 info.fPostTranslate = buffer.readBool();
240 buffer.readPaint(this->addLayerOnTop(info));
242 SkASSERT(count == fCount);
252 SkASSERT(count == n);
258 void SkLayerDrawLooper::toString(SkString* str) const {
259 str->appendf("SkLayerDrawLooper (%d): ", fCount);
262 for (int i = 0; i < fCount; i++) {
263 str->appendf("%d: ", i);
265 str->append("flagsMask: (");
266 if (0 == rec->fInfo.fFlagsMask) {
269 bool needSeparator = false;
270 SkAddFlagToString(str, SkToBool(SkPaint::kAntiAlias_Flag & rec->fInfo.fFlagsMask),
271 "AntiAlias", &needSeparator);
272 // SkAddFlagToString(str, SkToBool(SkPaint::kFilterBitmap_Flag & rec->fInfo.fFlagsMask), "FilterBitmap", &needSeparator);
273 SkAddFlagToString(str, SkToBool(SkPaint::kDither_Flag & rec->fInfo.fFlagsMask),
274 "Dither", &needSeparator);
275 SkAddFlagToString(str, SkToBool(SkPaint::kUnderlineText_Flag & rec->fInfo.fFlagsMask),
276 "UnderlineText", &needSeparator);
277 SkAddFlagToString(str, SkToBool(SkPaint::kStrikeThruText_Flag & rec->fInfo.fFlagsMask),
278 "StrikeThruText", &needSeparator);
279 SkAddFlagToString(str, SkToBool(SkPaint::kFakeBoldText_Flag & rec->fInfo.fFlagsMask),
280 "FakeBoldText", &needSeparator);
281 SkAddFlagToString(str, SkToBool(SkPaint::kLinearText_Flag & rec->fInfo.fFlagsMask),
282 "LinearText", &needSeparator);
283 SkAddFlagToString(str, SkToBool(SkPaint::kSubpixelText_Flag & rec->fInfo.fFlagsMask),
284 "SubpixelText", &needSeparator);
285 SkAddFlagToString(str, SkToBool(SkPaint::kDevKernText_Flag & rec->fInfo.fFlagsMask),
286 "DevKernText", &needSeparator);
287 SkAddFlagToString(str, SkToBool(SkPaint::kLCDRenderText_Flag & rec->fInfo.fFlagsMask),
288 "LCDRenderText", &needSeparator);
289 SkAddFlagToString(str, SkToBool(SkPaint::kEmbeddedBitmapText_Flag & rec->fInfo.fFlagsMask),
290 "EmbeddedBitmapText", &needSeparator);
291 SkAddFlagToString(str, SkToBool(SkPaint::kAutoHinting_Flag & rec->fInfo.fFlagsMask),
292 "Autohinted", &needSeparator);
293 SkAddFlagToString(str, SkToBool(SkPaint::kVerticalText_Flag & rec->fInfo.fFlagsMask),
294 "VerticalText", &needSeparator);
295 SkAddFlagToString(str, SkToBool(SkPaint::kGenA8FromLCD_Flag & rec->fInfo.fFlagsMask),
296 "GenA8FromLCD", &needSeparator);
300 str->append("paintBits: (");
301 if (0 == rec->fInfo.fPaintBits) {
303 } else if (kEntirePaint_Bits == rec->fInfo.fPaintBits) {
304 str->append("EntirePaint");
306 bool needSeparator = false;
307 SkAddFlagToString(str, SkToBool(kStyle_Bit & rec->fInfo.fPaintBits), "Style",
309 SkAddFlagToString(str, SkToBool(kTextSkewX_Bit & rec->fInfo.fPaintBits), "TextSkewX",
311 SkAddFlagToString(str, SkToBool(kPathEffect_Bit & rec->fInfo.fPaintBits), "PathEffect",
313 SkAddFlagToString(str, SkToBool(kMaskFilter_Bit & rec->fInfo.fPaintBits), "MaskFilter",
315 SkAddFlagToString(str, SkToBool(kShader_Bit & rec->fInfo.fPaintBits), "Shader",
317 SkAddFlagToString(str, SkToBool(kColorFilter_Bit & rec->fInfo.fPaintBits), "ColorFilter",
319 SkAddFlagToString(str, SkToBool(kXfermode_Bit & rec->fInfo.fPaintBits), "Xfermode",
324 static const char* gModeStrings[SkXfermode::kLastMode+1] = {
325 "kClear", "kSrc", "kDst", "kSrcOver", "kDstOver", "kSrcIn", "kDstIn",
326 "kSrcOut", "kDstOut", "kSrcATop", "kDstATop", "kXor", "kPlus",
327 "kMultiply", "kScreen", "kOverlay", "kDarken", "kLighten", "kColorDodge",
328 "kColorBurn", "kHardLight", "kSoftLight", "kDifference", "kExclusion"
331 str->appendf("mode: %s ", gModeStrings[rec->fInfo.fColorMode]);
333 str->append("offset: (");
334 str->appendScalar(rec->fInfo.fOffset.fX);
336 str->appendScalar(rec->fInfo.fOffset.fY);
339 str->append("postTranslate: ");
340 if (rec->fInfo.fPostTranslate) {
341 str->append("true ");
343 str->append("false ");
346 rec->fPaint.toString(str);