转一篇，不过本位介绍的加亮和之前我想做的加亮闪缩效果还是有差别。
主要的思路是通过CCImage先载入图片，然后getData()获取图片数据，接着逐一获取各像素的RGB值（代码基于jpg，若是png则需要获取RGBA值），通过相应方法修改各像素点的值。之后将该CCImange加载到CCTexture2D中，再由CCSprite载入，然后即可自由操作CCSprite。
以上相当于是在生成CCSprite时载入已加亮或变灰了的图片，至于如何将已有的CCSprite加亮或变灰，尚等研究。
C++ Code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | //根据现有CCSprite，变亮和变灰
static CCSprite* graylightWithCCSprite(CCSprite* oldSprite,bool isLight)
{
//CCSprite转成CCimage
CCPoint p = oldSprite->getAnchorPoint();
oldSprite->setAnchorPoint(ccp(0,0));
CCRenderTexture *outTexture = CCRenderTexture::create((int)oldSprite->getContentSize().width,(int)oldSprite->getContentSize().height);
outTexture->begin();
oldSprite->visit();
outTexture->end();
oldSprite->setAnchorPoint(p);
CCImage* finalImage = outTexture->newCCImage();
unsigned char *pData = finalImage->getData();
int iIndex = 0;
if(isLight)
{
for (int i = 0; i < finalImage->getHeight(); i ++)
{
for (int j = 0; j < finalImage->getWidth(); j ++)
{
// highlight
int iHightlightPlus = 50;
int iBPos = iIndex;
unsigned int iB = pData[iIndex];
iIndex ++;
unsigned int iG = pData[iIndex];
iIndex ++;
unsigned int iR = pData[iIndex];
iIndex ++;
//unsigned int o = pData[iIndex];
iIndex ++; //原来的示例缺少
iB = (iB + iHightlightPlus > 255 ? 255 : iB + iHightlightPlus);
iG = (iG + iHightlightPlus > 255 ? 255 : iG + iHightlightPlus);
iR = (iR + iHightlightPlus > 255 ? 255 : iR + iHightlightPlus);
// iR = (iR < 0 ? 0 : iR);
// iG = (iG < 0 ? 0 : iG);
// iB = (iB < 0 ? 0 : iB);
pData[iBPos] = (unsigned char)iB;
pData[iBPos + 1] = (unsigned char)iG;
pData[iBPos + 2] = (unsigned char)iR;
}
}
}else{
for (int i = 0; i < finalImage->getHeight(); i ++)
{
for (int j = 0; j < finalImage->getWidth(); j ++)
{
// gray
int iBPos = iIndex;
unsigned int iB = pData[iIndex];
iIndex ++;
unsigned int iG = pData[iIndex];
iIndex ++;
unsigned int iR = pData[iIndex];
iIndex ++;
//unsigned int o = pData[iIndex];
iIndex ++; //原来的示例缺少
unsigned int iGray = 0.3 * iR + 0.4 * iG + 0.2 * iB;
pData[iBPos] = pData[iBPos + 1] = pData[iBPos + 2] = (unsigned char)iGray;
}
}
}
CCTexture2D *texture = new CCTexture2D;
texture->initWithImage(finalImage);
CCSprite* newSprite = CCSprite::createWithTexture(texture);
delete finalImage;
texture->release();
return newSprite;
}
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参考
有两处注释的地方是对原来例子修改的地方，不知道什么原因，原来的例子少了一个alpha通道