【麦可网】Cocos2d-X跨平台游戏开发---学习笔记
第十八课：Cocos2D-X缓存机制1-4
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课程目标：
-Cocos2D-X缓存机制
课程重点：
-Cocos2D-X纹理缓存
-Cocos2D-X精灵帧缓存
-Cocos2D-X动画缓存
考核目标：
-Cocos2D-X纹理缓存
-Cocos2D-X精灵帧缓存
-Cocos2D-X动画缓存
-TexturePacker图片拼合
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一、纹理缓存
CCSprite---CCTexture2D---CCTextureCache
---------------------createWithTexture-------------------------
bool CCSprite::initWithFile(const char *pszFilename)
{
CCAssert(pszFilename != NULL,"Invalid filename for sprite");
CCTexture2D *pTexture = CCTextureCache::sharedTextureCache()->addImage(pszFilename);
if (pTexture)
{
CCRect rect = CCRectZero;
rect.size = pTexture->getContentSize();
return initWithTexture(pTexture,rect);
}
// don't release here.
// when load texture Failed,it's better to get a "transparent" sprite than a crashed program
// this->release();
return false;
}
---------------------纹理缓存-------------------------
CCTexture2D * CCTextureCache::addImage(const char * path)
{
CCAssert(path != NULL,"TextureCache: fileimage MUST not be NULL");
CCTexture2D * texture = NULL;
CCImage* pImage = NULL;
// Split up directory and filename
// MUTEX:
// Needed since addImageAsync calls this method from a different thread
//pthread_mutex_lock(m_pDictLock);
std::string pathKey = path;
pathKey = CCFileUtils::sharedFileUtils()->fullPathForFilename(pathKey.c_str());
if (pathKey.size() == 0)
{
return NULL;
}
//纹理字典：判断纹理是否被加载
texture = (CCTexture2D*)m_pTextures->objectForKey(pathKey.c_str());
std::string fullpath = pathKey; // (CCFileUtils::sharedFileUtils()->fullPathFromRelativePath(path));
if (! texture)
{
std::string lowerCase(pathKey);
for (unsigned int i = 0; i < lowerCase.length(); ++i)
{
lowerCase[i] = tolower(lowerCase[i]);
}
// all images are handled by UIImage except PVR extension that is handled by our own handler
do
{
if (std::string::npos != lowerCase.find(".pvr"))
{
texture = this->addPVRImage(fullpath.c_str());
}
else if (std::string::npos != lowerCase.find(".pkm"))
{
// ETC1 file format,only supportted on Android
texture = this->addETCImage(fullpath.c_str());
}
else
{
CCImage::EImageFormat eImageFormat = CCImage::kFmtUnKnown;
if (std::string::npos != lowerCase.find(".png"))
{
eImageFormat = CCImage::kFmtPng;
}
else if (std::string::npos != lowerCase.find(".jpg") || std::string::npos != lowerCase.find(".jpeg"))
{
eImageFormat = CCImage::kFmtJpg;
}
else if (std::string::npos != lowerCase.find(".tif") || std::string::npos != lowerCase.find(".tiff"))
{
eImageFormat = CCImage::kFmtTiff;
}
else if (std::string::npos != lowerCase.find(".webp"))
{
eImageFormat = CCImage::kFmtWebp;
}
pImage = new CCImage();
CC_BREAK_IF(NULL == pImage);
bool bRet = pImage->initWithImageFile(fullpath.c_str(),eImageFormat);
CC_BREAK_IF(!bRet);
texture = new CCTexture2D();
if( texture &&
texture->initWithImage(pImage) )
{
#if CC_ENABLE_CACHE_TEXTURE_DATA
// cache the texture file name
VolatileTexture::addImageTexture(texture,fullpath.c_str(),eImageFormat);
#endif
m_pTextures->setObject(texture,pathKey.c_str());
texture->release();
}
else
{
CCLOG("cocos2d: Couldn't create texture for file:%s in CCTextureCache",path);
}
}
} while (0);
}
CC_SAFE_RELEASE(pImage);
//pthread_mutex_unlock(m_pDictLock);
return texture;
}
-----------------------纹理缓存的体现------------------------
低效率：
for (int i=0; i<1000; i++)
{
CCSprite* sprite_flower = CCSprite::create("hua.png");
sprite_flower->setPosition(ccp(CCRANDOM_0_1()*480,CCRANDOM_0_1()*320));
this->addChild(sprite_flower,1);
}
高效率:
CCSpriteBatchNode* spriteBatch = CCSpriteBatchNode::create("hua.png");
this->addChild(spriteBatch,1);
spriteBatch->setPosition(CCPointZero);
for (int i=0; i<5000; i++)
{
CCSprite* sprite = CCSprite::createWithTexture(spriteBatch->getTexture());
sprite->setPosition(ccp(CCRANDOM_0_1()*480,CCRANDOM_0_1()*320));
spriteBatch->addChild(sprite);
}
二、图片拼合
CCSpriteFrameCache* spriteFrameCache = CCSpriteFrameCache::sharedSpriteFrameCache();
spriteFrameCache->addSpriteFramesWithFile("hy.plist");
CCSpriteBatchNode* spriteBatch = CCSpriteBatchNode::create("hy.png");
this->addChild(spriteBatch,1);
spriteBatch->setPosition(CCPointZero);
for (int i=1; i<6; i++)
{
char str[50] = {0};
sprintf(str,"image %d.png",i);
CCSprite* sprite = CCSprite::createWithSpriteFrameName(str);
sprite->setPosition(ccp(CCRANDOM_0_1()*480,CCRANDOM_0_1()*320));
spriteBatch->addChild(sprite);
}
===================================================================
总结：
理解了帧缓存，就知道怎么优化动画显示了。
开心一刻：
一个小偷偷了别人一只鸡，当他正在小河边拔毛的时候，鸡的主人来了。
小偷吓得赶紧把鸡扔进小河里，鸡的主人看了看他，又看了看河里，问道：“河里 面是什么？”
小偷回答：“是一只鸡在洗澡。”
那人又问：“那为什么你在这里？”
小偷结结巴巴的说：“我在帮鸡看衣服。”
【麦可网】Cocos2d-X跨平台游戏开发---教程下载:http://pan.baidu.com/s/1kTio1Av
【麦可网】Cocos2d-X跨平台游戏开发---笔记系列:http://blog.csdn.net/qiulanzhu
