CCSpriteFrameCache精灵帧缓存分析(1)
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CCSpriteFrameCache精灵帧缓存分析(1)：1、单例类CCSpriteFrameCache* CCSpriteFrameCache::sharedSpriteFrameCache(void){ if (! pSharedSpriteFrameCache) { pSharedSpriteFrameCache = new CCSpriteFrameCache(); pSharedSpriteFrameCache->init(); } return pSharedSpriteFrameCache;}2、常用方法分析：void CCSpriteFrameCache::addSpriteFramesWithFile(const char *pszPlist){ CCAssert(pszPlist, "plist filename should not be NULL"); //文件缓存m_pLoadedFileNames，如果已经加载过，则不再加载 if (m_pLoadedFileNames->find(pszPlist) == m_pLoadedFileNames->end()) { std::string fullPath = CCFileUtils::sharedFileUtils()->fullPathForFilename(pszPlist);//因为xx.plist文件的根节点<dict>，所以使用createWithContentsOfFileThreadSafe方法//进行解析 CCDictionary *dict = CCDictionary::createWithContentsOfFileThreadSafe(fullPath.c_str()); string texturePath(""); /*<key>metadata</key><dict> <key>format</key> <integer>2</integer> <key>realTextureFileName</key> <string>digit03.pvr.ccz</string> <key>size</key> <string>{128,256}</string> <key>smartupdate</key> <string>$TexturePacker:SmartUpdate:3c8e7a7da2ef2a8189712fc559ff0750:163e3804f74ef566f6194c8708efc6b9:d14ec1949f1c567f2820ca7d65c7607d$</string> <key>textureFileName</key> <string>digit03.pvr.ccz</string></dict>*/ CCDictionary* metadataDict = (CCDictionary*)dict->objectForKey("metadata"); if (metadataDict) { // try to read texture file name from meta data // 得到纹理图片名 texturePath = metadataDict->valueForKey("textureFileName")->getCString(); } if (! texturePath.empty()) { // build texture path relative to plist file // texturePath 如果纹理名不为空，则通过pszPlist文件的相对路径，获得纹理文件的全路径 texturePath = CCFileUtils::sharedFileUtils()->fullPathFromRelativeFile(texturePath.c_str(), pszPlist); } else { //如果texturePath为空，则把pszPlist的后缀替换成.png，作为纹理图片名 // build texture path by replacing file extension texturePath = pszPlist; // remove .xxx size_t startPos = texturePath.find_last_of("."); texturePath = texturePath.erase(startPos); // append .png texturePath = texturePath.append(".png"); CCLOG("cocos2d: CCSpriteFrameCache: Trying to use file %s as texture", texturePath.c_str()); } //加载纹理 CCTexture2D *pTexture = CCTextureCache::sharedTextureCache()->addImage(texturePath.c_str()); if (pTexture) { addSpriteFramesWithDictionary(dict, pTexture); m_pLoadedFileNames->insert(pszPlist); } else { CCLOG("cocos2d: CCSpriteFrameCache: Couldn't load texture"); } dict->release(); }}---addSpriteFramesWithDictionary-->>void CCSpriteFrameCache::addSpriteFramesWithDictionary(CCDictionary* dictionary, CCTexture2D *pobTexture){ /* Supported Zwoptex Formats: ZWTCoordinatesFormatOptionXMLLegacy = 0, // Flash Version ZWTCoordinatesFormatOptionXML1_0 = 1, // Desktop Version 0.0 - 0.4b ZWTCoordinatesFormatOptionXML1_1 = 2, // Desktop Version 1.0.0 - 1.0.1 ZWTCoordinatesFormatOptionXML1_2 = 3, // Desktop Version 1.0.2+ */ CCDictionary *metadataDict = (CCDictionary*)dictionary->objectForKey("metadata"); //存储小图片信息的字典 CCDictionary *framesDict = (CCDictionary*)dictionary->objectForKey("frames"); int format = 0; // get the format // 获取图片打包的格式，版本 if(metadataDict != NULL) { format = metadataDict->valueForKey("format")->intValue(); } // check the format CCAssert(format >=0 && format <= 3, "format is not supported for CCSpriteFrameCache addSpriteFramesWithDictionary:textureFilename:"); //遍历小图片信息字典,根据小图片信息生成存储CCSpriteFrame的字典 CCDictElement* pElement = NULL; CCDICT_FOREACH(framesDict, pElement) { /* <key>digit03_00.png</key> <dict> <key>frame</key> <string>{{2,70},{32,44}}</string> <key>offset</key> <string>{0,0}</string> <key>rotated</key> <true/> <key>sourceColorRect</key> <string>{{0,0},{32,44}}</string> <key>sourceSize</key> <string>{32,44}</string> </dict>*/ CCDictionary* frameDict = (CCDictionary*)pElement->getObject(); std::string spriteFrameName = pElement->getStrKey(); CCSpriteFrame* spriteFrame = (CCSpriteFrame*)m_pSpriteFrames->objectForKey(spriteFrameName); if (spriteFrame) { continue; } //根据类型进行不同的解析，最终都会根据图片信息生成CCSpriteFrame，//并且存放到m_pSpriteFrames缓存中，那我们在创建精灵时，就可以//使用这些CCSpriteFrame去创建，这样就可以把很多小图打包成大图纹理，//优化纹理的使用。 if(format == 0) { float x = frameDict->valueForKey("x")->floatValue(); float y = frameDict->valueForKey("y")->floatValue(); float w = frameDict->valueForKey("width")->floatValue(); float h = frameDict->valueForKey("height")->floatValue(); float ox = frameDict->valueForKey("offsetX")->floatValue(); float oy = frameDict->valueForKey("offsetY")->floatValue(); int ow = frameDict->valueForKey("originalWidth")->intValue(); int oh = frameDict->valueForKey("originalHeight")->intValue(); // check ow/oh if(!ow || !oh) { CCLOGWARN("cocos2d: WARNING: originalWidth/Height not found on the CCSpriteFrame. AnchorPoint won't work as expected. Regenrate the .plist"); } // abs ow/oh ow = abs(ow); oh = abs(oh); // create frame spriteFrame = new CCSpriteFrame(); spriteFrame->initWithTexture(pobTexture, CCRectMake(x, y, w, h), false, CCPointMake(ox, oy), CCSizeMake((float)ow, (float)oh) ); } else if(format == 1 || format == 2) { CCRect frame = CCRectFromString(frameDict->valueForKey("frame")->getCString()); bool rotated = false; // rotation if (format == 2) { rotated = frameDict->valueForKey("rotated")->boolValue(); } CCPoint offset = CCPointFromString(frameDict->valueForKey("offset")->getCString()); CCSize sourceSize = CCSizeFromString(frameDict->valueForKey("sourceSize")->getCString()); // create frame spriteFrame = new CCSpriteFrame(); spriteFrame->initWithTexture(pobTexture, frame, rotated, offset, sourceSize ); } else if (format == 3) { // get values CCSize spriteSize = CCSizeFromString(frameDict->valueForKey("spriteSize")->getCString()); CCPoint spriteOffset = CCPointFromString(frameDict->valueForKey("spriteOffset")->getCString()); CCSize spriteSourceSize = CCSizeFromString(frameDict->valueForKey("spriteSourceSize")->getCString()); CCRect textureRect = CCRectFromString(frameDict->valueForKey("textureRect")->getCString()); bool textureRotated = frameDict->valueForKey("textureRotated")->boolValue(); // get aliases CCArray* aliases = (CCArray*) (frameDict->objectForKey("aliases")); CCString * frameKey = new CCString(spriteFrameName); CCObject* pObj = NULL; CCARRAY_FOREACH(aliases, pObj) { std::string oneAlias = ((CCString*)pObj)->getCString(); if (m_pSpriteFramesAliases->objectForKey(oneAlias.c_str())) { CCLOGWARN("cocos2d: WARNING: an alias with name %s already exists", oneAlias.c_str()); } m_pSpriteFramesAliases->setObject(frameKey, oneAlias.c_str()); } frameKey->release(); // create frame spriteFrame = new CCSpriteFrame(); spriteFrame->initWithTexture(pobTexture, CCRectMake(textureRect.origin.x, textureRect.origin.y, spriteSize.width, spriteSize.height), textureRotated, spriteOffset, spriteSourceSize); } // add sprite frame m_pSpriteFrames->setObject(spriteFrame, spriteFrameName); spriteFrame->release(); }} 0 0
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