cocos2d-x图片变灰或者变亮
//根据现有CCSprite，变亮和变灰
CCSprite* FlyLeaf::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);
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 = 0.299 * iR + 0.587 * iG + 0.114 * 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;
}