CCTexture2D* Util::getGrayTexture(const char* filename){
typedef enum {
RED = 0,
GREEN = 1,
BLUE = 2,
ALPHA = 3
} PIXELS;
CCImage *image = new CCImage();
image->initWithImageFile(filename);
unsigned char* pixels = image->getData();
int len = image->getDataLen();
uint32_t *p = (uint32_t *)pixels;
for(int i=0;i<len;i++){
uint8_t *rgbaPixel = (uint8_t *) &p[i];
//uint32_t gray = 0.3 * rgbaPixel[RED] + 0.59 * rgbaPixel[GREEN] + 0.11 * rgbaPixel[BLUE];
uint32_t gray = 1.2*rgbaPixel[RED] + 1.0*rgbaPixel[GREEN] + 0.0*rgbaPixel[BLUE];
// set the pixels to gray
rgbaPixel[RED] = gray;
rgbaPixel[GREEN] = gray;
rgbaPixel[BLUE] = gray;
}
CCTexture2D* texture = new CCTexture2D();
texture->autorelease();
texture->initWithImage(image);
image->release();
return texture;
}
CCTexture2D* Util::getGrayTexture(CCTexture2D* texture){
typedef enum {
RED = 0,
GREEN = 1,
BLUE = 2,
ALPHA = 3
} PIXELS;
CCSize textSize = texture->getContentSize();
CCSprite *temporarySprite = CCSprite::createWithTexture(texture);
//就这么一小句搞了我半天了，不过能出来也值了
temporarySprite->setAnchorPoint(ccp(0,0));
CCRenderTexture *rt = CCRenderTexture::create(textSize.width, textSize.height);
rt->begin();
temporarySprite->visit();
rt->end();
CCImage *image = rt->newCCImage();
unsigned char* pixels = image->getData();
int len = image->getDataLen();
uint32_t *p = (uint32_t *)pixels;
for(int i=0;i<len;i++){
uint8_t *rgbaPixel = (uint8_t *) &p[i];
//uint32_t gray = 0.3 * rgbaPixel[RED] + 0.59 * rgbaPixel[GREEN] + 0.11 * rgbaPixel[BLUE];
uint32_t gray = 1.2*rgbaPixel[RED] + 1.0*rgbaPixel[GREEN] + 0.0*rgbaPixel[BLUE];
// set the pixels to gray
rgbaPixel[RED] = gray;
rgbaPixel[GREEN] = gray;
rgbaPixel[BLUE] = gray;
}
CCTexture2D* newtexture = new CCTexture2D();
newtexture->autorelease();
newtexture->initWithImage(image);
image->release();
return newtexture;
}
CCSprite * BSAddStrokeToLabel(cocos2d::CCLabelTTF * label, float size, cocos2d::ccColor3B color, GLubyte opacity) {
CCPoint originalPos = label->getPosition();
ccColor3B originalColor = label->getColor();
GLubyte originalOpacity = label->getOpacity();
bool originalVisibility = label->isVisible();
ccBlendFunc originalBlend = label->getBlendFunc();
label->setColor(color);
label->setOpacity(opacity);
ccBlendFunc bf = {GL_SRC_ALPHA, GL_ONE};
label->setBlendFunc(bf);
CCPoint bottomLeft = ccp(label->getTexture()->getContentSize().width * label->getAnchorPoint().x + size,
label->getTexture()->getContentSize().height * label->getAnchorPoint().y + size);
CCRenderTexture* rt = CCRenderTexture::create(label->getTexture()->getContentSize().width + size * 2,
label->getTexture()->getContentSize().height + size * 2);
/* 在原始位置绘制文字，用于镂空用 */
label->setPosition(bottomLeft);
rt->begin();
label->visit();
rt->end();
CCImage * originText = rt->newCCImage();
glBlendEquation(GL_BLEND_EQUATION_ALPHA);
/* 在各个方向上移动文字，重叠得到未镂空的描边 */
rt->begin();
/* Bresenham's circle algorithm */
int radis = 3 * size;
for (int x = 0, y = radis, d = 3 - 2 * radis; x <= y; ++x) {
float xx = x / 3.0F, yy = y / 3.0F;
label->setPosition(ccp(bottomLeft.x + xx, bottomLeft.y + yy)); label->visit();
label->setPosition(ccp(bottomLeft.x - xx, bottomLeft.y + yy)); label->visit();
label->setPosition(ccp(bottomLeft.x + xx, bottomLeft.y - yy)); label->visit();
label->setPosition(ccp(bottomLeft.x - xx, bottomLeft.y - yy)); label->visit();
label->setPosition(ccp(bottomLeft.x + yy, bottomLeft.y + xx)); label->visit();
label->setPosition(ccp(bottomLeft.x - yy, bottomLeft.y + xx)); label->visit();
label->setPosition(ccp(bottomLeft.x + yy, bottomLeft.y - xx)); label->visit();
label->setPosition(ccp(bottomLeft.x - yy, bottomLeft.y - xx)); label->visit();
if (d < 0) {
d = d + 4 * x + 6;
} else {
d = d + 4 * (x - y) + 10;
y --;
}
}
rt->end();
/* TODO: ugly workaround. rendertexture多次绘制颜色叠加，需要取色值大的那个，需要通过glBlendEquation(GL_MAX)实现。
* see http://stackoverflow.com/questions/2143690/is-it-possible-to-achieve-maxas-ad-opengl-blending */
CCImage * strokedText = rt->newCCImage();
unsigned char * pStorke = strokedText->getData();
unsigned char * pErase = originText->getData();
for (int i = 0; i < strokedText->getDataLen(); ++i) {
if ((unsigned int) pErase[i * 4] != 0) {
*(unsigned int *) &pStorke[i * 4] = 0;
} else if ((unsigned int) pStorke[i * 4] != 0) {
unsigned char * pixel = &pStorke[i * 4];
(*pixel++) = color.r;
(*pixel++) = color.g;
(*pixel++) = color.b;
*pixel = opacity;
}
}
originText->release();
/* 用RenderTexture构造一个Sprite，以实现支持透明度 FadeIn FadeOut */
CCTexture2D * texture2D = new CCTexture2D();
texture2D->initWithImage(strokedText);
strokedText->release();
CCSprite * sprite = CCSprite::createWithTexture(texture2D);
texture2D->release();
label->setPosition(originalPos);
label->setColor(originalColor);
label->setBlendFunc(originalBlend);
label->setVisible(originalVisibility);
label->setOpacity(originalOpacity);
sprite->setPosition(ccp(label->getTexture()->getContentSize().width / 2, label->getTexture()->getContentSize().height / 2));
label->addChild(sprite, -1);
return sprite;
}
