1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SkCanvas.h"
9 #include "SkColor.h"
10 #include "SkReadBuffer.h"
11 #include "SkWriteBuffer.h"
12 #include "SkLayerDrawLooper.h"
13 #include "SkString.h"
14 #include "SkStringUtils.h"
15 #include "SkUnPreMultiply.h"
16
LayerInfo()17 SkLayerDrawLooper::LayerInfo::LayerInfo() {
18 fPaintBits = 0; // ignore our paint fields
19 fColorMode = SkXfermode::kDst_Mode; // ignore our color
20 fOffset.set(0, 0);
21 fPostTranslate = false;
22 }
23
SkLayerDrawLooper()24 SkLayerDrawLooper::SkLayerDrawLooper()
25 : fRecs(NULL),
26 fTopRec(NULL),
27 fCount(0) {
28 }
29
~SkLayerDrawLooper()30 SkLayerDrawLooper::~SkLayerDrawLooper() {
31 Rec* rec = fRecs;
32 while (rec) {
33 Rec* next = rec->fNext;
34 SkDELETE(rec);
35 rec = next;
36 }
37 }
38
createContext(SkCanvas * canvas,void * storage) const39 SkLayerDrawLooper::Context* SkLayerDrawLooper::createContext(SkCanvas* canvas, void* storage) const {
40 canvas->save();
41 return SkNEW_PLACEMENT_ARGS(storage, LayerDrawLooperContext, (this));
42 }
43
xferColor(SkColor src,SkColor dst,SkXfermode::Mode mode)44 static SkColor xferColor(SkColor src, SkColor dst, SkXfermode::Mode mode) {
45 switch (mode) {
46 case SkXfermode::kSrc_Mode:
47 return src;
48 case SkXfermode::kDst_Mode:
49 return dst;
50 default: {
51 SkPMColor pmS = SkPreMultiplyColor(src);
52 SkPMColor pmD = SkPreMultiplyColor(dst);
53 SkPMColor result = SkXfermode::GetProc(mode)(pmS, pmD);
54 return SkUnPreMultiply::PMColorToColor(result);
55 }
56 }
57 }
58
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.
ApplyInfo(SkPaint * dst,const SkPaint & src,const LayerInfo & info)62 void SkLayerDrawLooper::LayerDrawLooperContext::ApplyInfo(
63 SkPaint* dst, const SkPaint& src, const LayerInfo& info) {
64
65 dst->setColor(xferColor(src.getColor(), dst->getColor(), info.fColorMode));
66
67 BitFlags bits = info.fPaintBits;
68 SkPaint::TextEncoding encoding = dst->getTextEncoding();
69
70 if (0 == bits) {
71 return;
72 }
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();
77 *dst = src;
78 dst->setFlags(f);
79 dst->setColor(c);
80 dst->setTextEncoding(encoding);
81 return;
82 }
83
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());
90 }
91
92 if (bits & kTextSkewX_Bit) {
93 dst->setTextSkewX(src.getTextSkewX());
94 }
95
96 if (bits & kPathEffect_Bit) {
97 dst->setPathEffect(src.getPathEffect());
98 }
99 if (bits & kMaskFilter_Bit) {
100 dst->setMaskFilter(src.getMaskFilter());
101 }
102 if (bits & kShader_Bit) {
103 dst->setShader(src.getShader());
104 }
105 if (bits & kColorFilter_Bit) {
106 dst->setColorFilter(src.getColorFilter());
107 }
108 if (bits & kXfermode_Bit) {
109 dst->setXfermode(src.getXfermode());
110 }
111
112 // we don't override these
113 #if 0
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());
121 #endif
122 }
123
124 // Should we add this to canvas?
postTranslate(SkCanvas * canvas,SkScalar dx,SkScalar dy)125 static void postTranslate(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
126 SkMatrix m = canvas->getTotalMatrix();
127 m.postTranslate(dx, dy);
128 canvas->setMatrix(m);
129 }
130
LayerDrawLooperContext(const SkLayerDrawLooper * looper)131 SkLayerDrawLooper::LayerDrawLooperContext::LayerDrawLooperContext(
132 const SkLayerDrawLooper* looper) : fCurrRec(looper->fRecs) {}
133
next(SkCanvas * canvas,SkPaint * paint)134 bool SkLayerDrawLooper::LayerDrawLooperContext::next(SkCanvas* canvas,
135 SkPaint* paint) {
136 canvas->restore();
137 if (NULL == fCurrRec) {
138 return false;
139 }
140
141 ApplyInfo(paint, fCurrRec->fPaint, fCurrRec->fInfo);
142
143 canvas->save();
144 if (fCurrRec->fInfo.fPostTranslate) {
145 postTranslate(canvas, fCurrRec->fInfo.fOffset.fX,
146 fCurrRec->fInfo.fOffset.fY);
147 } else {
148 canvas->translate(fCurrRec->fInfo.fOffset.fX,
149 fCurrRec->fInfo.fOffset.fY);
150 }
151 fCurrRec = fCurrRec->fNext;
152
153 return true;
154 }
155
asABlurShadow(BlurShadowRec * bsRec) const156 bool SkLayerDrawLooper::asABlurShadow(BlurShadowRec* bsRec) const {
157 if (fCount != 2) {
158 return false;
159 }
160 const Rec* rec = fRecs;
161
162 // bottom layer needs to be just blur(maskfilter)
163 if ((rec->fInfo.fPaintBits & ~kMaskFilter_Bit)) {
164 return false;
165 }
166 if (SkXfermode::kSrc_Mode != rec->fInfo.fColorMode) {
167 return false;
168 }
169 const SkMaskFilter* mf = rec->fPaint.getMaskFilter();
170 if (NULL == mf) {
171 return false;
172 }
173 SkMaskFilter::BlurRec maskBlur;
174 if (!mf->asABlur(&maskBlur)) {
175 return false;
176 }
177
178 rec = rec->fNext;
179 // top layer needs to be "plain"
180 if (rec->fInfo.fPaintBits) {
181 return false;
182 }
183 if (SkXfermode::kDst_Mode != rec->fInfo.fColorMode) {
184 return false;
185 }
186 if (!rec->fInfo.fOffset.equals(0, 0)) {
187 return false;
188 }
189
190 if (bsRec) {
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;
196 }
197 return true;
198 }
199
200 ///////////////////////////////////////////////////////////////////////////////
201
flatten(SkWriteBuffer & buffer) const202 void SkLayerDrawLooper::flatten(SkWriteBuffer& buffer) const {
203 buffer.writeInt(fCount);
204
205 Rec* rec = fRecs;
206 for (int i = 0; i < fCount; i++) {
207 // Legacy "flagsmask" field -- now ignored, remove when we bump version
208 buffer.writeInt(0);
209
210 buffer.writeInt(rec->fInfo.fPaintBits);
211 buffer.writeInt(rec->fInfo.fColorMode);
212 buffer.writePoint(rec->fInfo.fOffset);
213 buffer.writeBool(rec->fInfo.fPostTranslate);
214 buffer.writePaint(rec->fPaint);
215 rec = rec->fNext;
216 }
217 }
218
CreateProc(SkReadBuffer & buffer)219 SkFlattenable* SkLayerDrawLooper::CreateProc(SkReadBuffer& buffer) {
220 int count = buffer.readInt();
221
222 Builder builder;
223 for (int i = 0; i < count; i++) {
224 LayerInfo info;
225 // Legacy "flagsmask" field -- now ignored, remove when we bump version
226 (void)buffer.readInt();
227
228 info.fPaintBits = buffer.readInt();
229 info.fColorMode = (SkXfermode::Mode)buffer.readInt();
230 buffer.readPoint(&info.fOffset);
231 info.fPostTranslate = buffer.readBool();
232 buffer.readPaint(builder.addLayerOnTop(info));
233 }
234 return builder.detachLooper();
235 }
236
237 #ifndef SK_IGNORE_TO_STRING
toString(SkString * str) const238 void SkLayerDrawLooper::toString(SkString* str) const {
239 str->appendf("SkLayerDrawLooper (%d): ", fCount);
240
241 Rec* rec = fRecs;
242 for (int i = 0; i < fCount; i++) {
243 str->appendf("%d: paintBits: (", i);
244 if (0 == rec->fInfo.fPaintBits) {
245 str->append("None");
246 } else if (kEntirePaint_Bits == rec->fInfo.fPaintBits) {
247 str->append("EntirePaint");
248 } else {
249 bool needSeparator = false;
250 SkAddFlagToString(str, SkToBool(kStyle_Bit & rec->fInfo.fPaintBits), "Style",
251 &needSeparator);
252 SkAddFlagToString(str, SkToBool(kTextSkewX_Bit & rec->fInfo.fPaintBits), "TextSkewX",
253 &needSeparator);
254 SkAddFlagToString(str, SkToBool(kPathEffect_Bit & rec->fInfo.fPaintBits), "PathEffect",
255 &needSeparator);
256 SkAddFlagToString(str, SkToBool(kMaskFilter_Bit & rec->fInfo.fPaintBits), "MaskFilter",
257 &needSeparator);
258 SkAddFlagToString(str, SkToBool(kShader_Bit & rec->fInfo.fPaintBits), "Shader",
259 &needSeparator);
260 SkAddFlagToString(str, SkToBool(kColorFilter_Bit & rec->fInfo.fPaintBits), "ColorFilter",
261 &needSeparator);
262 SkAddFlagToString(str, SkToBool(kXfermode_Bit & rec->fInfo.fPaintBits), "Xfermode",
263 &needSeparator);
264 }
265 str->append(") ");
266
267 static const char* gModeStrings[SkXfermode::kLastMode+1] = {
268 "kClear", "kSrc", "kDst", "kSrcOver", "kDstOver", "kSrcIn", "kDstIn",
269 "kSrcOut", "kDstOut", "kSrcATop", "kDstATop", "kXor", "kPlus",
270 "kMultiply", "kScreen", "kOverlay", "kDarken", "kLighten", "kColorDodge",
271 "kColorBurn", "kHardLight", "kSoftLight", "kDifference", "kExclusion"
272 };
273
274 str->appendf("mode: %s ", gModeStrings[rec->fInfo.fColorMode]);
275
276 str->append("offset: (");
277 str->appendScalar(rec->fInfo.fOffset.fX);
278 str->append(", ");
279 str->appendScalar(rec->fInfo.fOffset.fY);
280 str->append(") ");
281
282 str->append("postTranslate: ");
283 if (rec->fInfo.fPostTranslate) {
284 str->append("true ");
285 } else {
286 str->append("false ");
287 }
288
289 rec->fPaint.toString(str);
290 rec = rec->fNext;
291 }
292 }
293 #endif
294
Builder()295 SkLayerDrawLooper::Builder::Builder()
296 : fRecs(NULL),
297 fTopRec(NULL),
298 fCount(0) {
299 }
300
~Builder()301 SkLayerDrawLooper::Builder::~Builder() {
302 Rec* rec = fRecs;
303 while (rec) {
304 Rec* next = rec->fNext;
305 SkDELETE(rec);
306 rec = next;
307 }
308 }
309
addLayer(const LayerInfo & info)310 SkPaint* SkLayerDrawLooper::Builder::addLayer(const LayerInfo& info) {
311 fCount += 1;
312
313 Rec* rec = SkNEW(Rec);
314 rec->fNext = fRecs;
315 rec->fInfo = info;
316 fRecs = rec;
317 if (NULL == fTopRec) {
318 fTopRec = rec;
319 }
320
321 return &rec->fPaint;
322 }
323
addLayer(SkScalar dx,SkScalar dy)324 void SkLayerDrawLooper::Builder::addLayer(SkScalar dx, SkScalar dy) {
325 LayerInfo info;
326
327 info.fOffset.set(dx, dy);
328 (void)this->addLayer(info);
329 }
330
addLayerOnTop(const LayerInfo & info)331 SkPaint* SkLayerDrawLooper::Builder::addLayerOnTop(const LayerInfo& info) {
332 fCount += 1;
333
334 Rec* rec = SkNEW(Rec);
335 rec->fNext = NULL;
336 rec->fInfo = info;
337 if (NULL == fRecs) {
338 fRecs = rec;
339 } else {
340 SkASSERT(fTopRec);
341 fTopRec->fNext = rec;
342 }
343 fTopRec = rec;
344
345 return &rec->fPaint;
346 }
347
detachLooper()348 SkLayerDrawLooper* SkLayerDrawLooper::Builder::detachLooper() {
349 SkLayerDrawLooper* looper = SkNEW(SkLayerDrawLooper);
350 looper->fCount = fCount;
351 looper->fRecs = fRecs;
352
353 fCount = 0;
354 fRecs = NULL;
355 fTopRec = NULL;
356
357 return looper;
358 }
359