bsalomon | 47cc769 | 2016-04-26 12:56:00 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "GrShape.h" |
| 9 | |
| 10 | GrShape& GrShape::operator=(const GrShape& that) { |
| 11 | bool wasPath = Type::kPath == fType; |
| 12 | fStyle = that.fStyle; |
| 13 | fType = that.fType; |
| 14 | switch (fType) { |
| 15 | case Type::kEmpty: |
| 16 | if (wasPath) { |
| 17 | fPath.reset(); |
| 18 | } |
| 19 | break; |
| 20 | case Type::kRRect: |
| 21 | if (wasPath) { |
| 22 | fPath.reset(); |
| 23 | } |
| 24 | fRRect = that.fRRect; |
| 25 | break; |
| 26 | case Type::kPath: |
| 27 | if (wasPath) { |
| 28 | *fPath.get() = *that.fPath.get(); |
| 29 | } else { |
| 30 | fPath.set(*that.fPath.get()); |
| 31 | } |
| 32 | break; |
| 33 | } |
| 34 | fInheritedKey.reset(that.fInheritedKey.count()); |
| 35 | memcpy(fInheritedKey.get(), that.fInheritedKey.get(), |
| 36 | sizeof(uint32_t) * fInheritedKey.count()); |
| 37 | return *this; |
| 38 | } |
| 39 | |
| 40 | int GrShape::unstyledKeySize() const { |
| 41 | if (fInheritedKey.count()) { |
| 42 | return fInheritedKey.count(); |
| 43 | } |
| 44 | switch (fType) { |
| 45 | case Type::kEmpty: |
| 46 | return 1; |
| 47 | case Type::kRRect: |
| 48 | SkASSERT(!fInheritedKey.count()); |
| 49 | SkASSERT(0 == SkRRect::kSizeInMemory % sizeof(uint32_t)); |
| 50 | return SkRRect::kSizeInMemory / sizeof(uint32_t); |
| 51 | case Type::kPath: |
| 52 | if (fPath.get()->isVolatile()) { |
| 53 | return -1; |
| 54 | } else { |
| 55 | return 1; |
| 56 | } |
| 57 | } |
| 58 | SkFAIL("Should never get here."); |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | void GrShape::writeUnstyledKey(uint32_t* key) const { |
| 63 | SkASSERT(this->unstyledKeySize()); |
| 64 | SkDEBUGCODE(uint32_t* origKey = key;) |
| 65 | if (fInheritedKey.count()) { |
| 66 | memcpy(key, fInheritedKey.get(), sizeof(uint32_t) * fInheritedKey.count()); |
| 67 | SkDEBUGCODE(key += fInheritedKey.count();) |
| 68 | } else { |
| 69 | switch (fType) { |
| 70 | case Type::kEmpty: |
| 71 | *key++ = 1; |
| 72 | break; |
| 73 | case Type::kRRect: |
| 74 | fRRect.writeToMemory(key); |
| 75 | key += SkRRect::kSizeInMemory / sizeof(uint32_t); |
| 76 | break; |
| 77 | case Type::kPath: |
| 78 | SkASSERT(!fPath.get()->isVolatile()); |
| 79 | *key++ = fPath.get()->getGenerationID(); |
| 80 | break; |
| 81 | } |
| 82 | } |
| 83 | SkASSERT(key - origKey == this->unstyledKeySize()); |
| 84 | } |
| 85 | |
| 86 | int GrShape::StyleKeySize(const GrStyle& style, bool stopAfterPE) { |
| 87 | GR_STATIC_ASSERT(sizeof(uint32_t) == sizeof(SkScalar)); |
| 88 | int size = 0; |
| 89 | if (style.isDashed()) { |
| 90 | // One scalar for dash phase and one for each dash value. |
| 91 | size += 1 + style.dashIntervalCnt(); |
| 92 | } else if (style.pathEffect()) { |
| 93 | // No key for a generic path effect. |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | if (stopAfterPE) { |
| 98 | return size; |
| 99 | } |
| 100 | |
| 101 | if (style.strokeRec().needToApply()) { |
| 102 | // One for style/cap/join, 2 for miter and width. |
| 103 | size += 3; |
| 104 | } |
| 105 | return size; |
| 106 | } |
| 107 | |
| 108 | void GrShape::StyleKey(uint32_t* key, const GrStyle& style, bool stopAfterPE) { |
| 109 | SkASSERT(key); |
| 110 | SkASSERT(StyleKeySize(style, stopAfterPE) >= 0); |
| 111 | GR_STATIC_ASSERT(sizeof(uint32_t) == sizeof(SkScalar)); |
| 112 | |
| 113 | int i = 0; |
| 114 | if (style.isDashed()) { |
| 115 | GR_STATIC_ASSERT(sizeof(style.dashPhase()) == sizeof(uint32_t)); |
| 116 | SkScalar phase = style.dashPhase(); |
| 117 | memcpy(&key[i++], &phase, sizeof(SkScalar)); |
| 118 | |
| 119 | int32_t count = style.dashIntervalCnt(); |
| 120 | // Dash count should always be even. |
| 121 | SkASSERT(0 == (count & 0x1)); |
| 122 | const SkScalar* intervals = style.dashIntervals(); |
| 123 | int intervalByteCnt = count * sizeof(SkScalar); |
| 124 | memcpy(&key[i], intervals, intervalByteCnt); |
| 125 | i += count; |
| 126 | } else { |
| 127 | SkASSERT(!style.pathEffect()); |
| 128 | } |
| 129 | |
| 130 | if (!stopAfterPE && style.strokeRec().needToApply()) { |
| 131 | enum { |
| 132 | kStyleBits = 2, |
| 133 | kJoinBits = 2, |
| 134 | kCapBits = 32 - kStyleBits - kJoinBits, |
| 135 | |
| 136 | kJoinShift = kStyleBits, |
| 137 | kCapShift = kJoinShift + kJoinBits, |
| 138 | }; |
| 139 | GR_STATIC_ASSERT(SkStrokeRec::kStyleCount <= (1 << kStyleBits)); |
| 140 | GR_STATIC_ASSERT(SkPaint::kJoinCount <= (1 << kJoinBits)); |
| 141 | GR_STATIC_ASSERT(SkPaint::kCapCount <= (1 << kCapBits)); |
| 142 | key[i++] = style.strokeRec().getStyle() | |
| 143 | style.strokeRec().getJoin() << kJoinShift | |
| 144 | style.strokeRec().getCap() << kCapShift; |
| 145 | |
| 146 | SkScalar scalar; |
| 147 | // Miter limit only affects miter joins |
| 148 | scalar = SkPaint::kMiter_Join == style.strokeRec().getJoin() |
| 149 | ? style.strokeRec().getMiter() |
| 150 | : -1.f; |
| 151 | memcpy(&key[i++], &scalar, sizeof(scalar)); |
| 152 | |
| 153 | scalar = style.strokeRec().getWidth(); |
| 154 | memcpy(&key[i++], &scalar, sizeof(scalar)); |
| 155 | } |
| 156 | SkASSERT(StyleKeySize(style, stopAfterPE) == i); |
| 157 | } |
| 158 | |
| 159 | void GrShape::setInheritedKey(const GrShape &parent, bool stopAfterPE){ |
| 160 | SkASSERT(!fInheritedKey.count()); |
| 161 | // If the output shape turns out to be simple, then we will just use its geometric key |
| 162 | if (Type::kPath == fType) { |
| 163 | // We want ApplyFullStyle(ApplyPathEffect(shape)) to have the same key as |
| 164 | // ApplyFullStyle(shape). |
| 165 | // The full key is structured as (geo,path_effect,stroke). |
| 166 | // If we do ApplyPathEffect we get get,path_effect as the inherited key. If we then |
| 167 | // do ApplyFullStyle we'll memcpy geo,path_effect into the new inherited key |
| 168 | // and then append the style key (which should now be stroke only) at the end. |
| 169 | int parentCnt = parent.fInheritedKey.count(); |
| 170 | bool useParentGeoKey = !parentCnt; |
| 171 | if (useParentGeoKey) { |
| 172 | parentCnt = parent.unstyledKeySize(); |
| 173 | } |
| 174 | int styleCnt = StyleKeySize(parent.fStyle, stopAfterPE); |
| 175 | if (styleCnt < 0) { |
| 176 | // The style doesn't allow a key, set the path to volatile so that we fail when |
| 177 | // we try to get a key for the shape. |
| 178 | fPath.get()->setIsVolatile(true); |
| 179 | } else { |
| 180 | fInheritedKey.reset(parentCnt + styleCnt); |
| 181 | if (useParentGeoKey) { |
| 182 | // This will be the geo key. |
| 183 | parent.writeUnstyledKey(fInheritedKey.get()); |
| 184 | } else { |
| 185 | // This should be geo,path_effect |
| 186 | memcpy(fInheritedKey.get(), parent.fInheritedKey.get(), |
| 187 | parentCnt * sizeof(uint32_t)); |
| 188 | } |
| 189 | // Now turn (geo,path_effect) or (geo) into (geo,path_effect,stroke) |
| 190 | StyleKey(fInheritedKey.get() + parentCnt, parent.fStyle, stopAfterPE); |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | GrShape::GrShape(const GrShape& that) : fType(that.fType), fStyle(that.fStyle) { |
| 196 | switch (fType) { |
| 197 | case Type::kEmpty: |
| 198 | return; |
| 199 | case Type::kRRect: |
| 200 | fRRect = that.fRRect; |
| 201 | return; |
| 202 | case Type::kPath: |
| 203 | fPath.set(*that.fPath.get()); |
| 204 | return; |
| 205 | } |
| 206 | fInheritedKey.reset(that.fInheritedKey.count()); |
| 207 | memcpy(fInheritedKey.get(), that.fInheritedKey.get(), |
| 208 | sizeof(uint32_t) * fInheritedKey.count()); |
| 209 | } |
| 210 | |
| 211 | GrShape::GrShape(const GrShape& parent, bool stopAfterPE) { |
| 212 | fType = Type::kEmpty; |
| 213 | SkPathEffect* pe = parent.fStyle.pathEffect(); |
| 214 | const SkPath* inPath; |
| 215 | SkStrokeRec strokeRec = parent.fStyle.strokeRec(); |
| 216 | if (pe) { |
| 217 | fType = Type::kPath; |
| 218 | fPath.init(); |
| 219 | if (parent.fType == Type::kPath) { |
| 220 | inPath = parent.fPath.get(); |
| 221 | } else { |
| 222 | inPath = fPath.get(); |
| 223 | parent.asPath(fPath.get()); |
| 224 | } |
| 225 | // Should we consider bounds? Would have to include in key, but it'd be nice to know |
| 226 | // if the bounds actually modified anything before including in key. |
| 227 | if (!pe->filterPath(fPath.get(), *inPath, &strokeRec, nullptr)) { |
| 228 | // Make an empty unstyled shape if filtering fails. |
| 229 | fType = Type::kEmpty; |
| 230 | fStyle = GrStyle(); |
| 231 | fPath.reset(); |
| 232 | return; |
| 233 | } |
| 234 | inPath = fPath.get(); |
| 235 | } else if (stopAfterPE || !strokeRec.needToApply()) { |
| 236 | *this = parent; |
| 237 | return; |
| 238 | } else { |
| 239 | fType = Type::kPath; |
| 240 | fPath.init(); |
| 241 | if (parent.fType == Type::kPath) { |
| 242 | inPath = parent.fPath.get(); |
| 243 | } else { |
| 244 | inPath = fPath.get(); |
| 245 | parent.asPath(fPath.get()); |
| 246 | } |
| 247 | } |
| 248 | if (!stopAfterPE) { |
| 249 | strokeRec.applyToPath(fPath.get(), *inPath); |
| 250 | } else { |
| 251 | fStyle = GrStyle(strokeRec, nullptr); |
| 252 | } |
| 253 | this->setInheritedKey(parent, stopAfterPE); |
| 254 | } |