获取并设置CCSprite(cocos2d-x)中像素的RGB/RGBA值 [英] Getting and setting the RGB / RGBA value of a pixel in a CCSprite (cocos2d-x)

问题描述

我为什么需要这个?

基本上，我需要将彩色图像转换为灰度图像.包括图像的灰度版本可能是一种解决方案，但是在我的情况下空间很小-我不希望我的APK太大.此外，我也想对像素进行一些效果处理.同样，这是为了使APK变小.

Basically I need to turn a color image into gray-scale. Including a gray-scale version of the image could be a solution, but space is tight in my situation - I don't want my APK to be too big. Besides, I would like to work on the pixels for some effects too. Again, this is to make the APK smaller.

我从CCTexture2D找到了 getPixel setPixel 和获取图像的像素RGBA ，但是我想要更简单的方法.

I have found getPixel setPixel from CCTexture2D and Getting image's pixel RGBA, but I would like something more simple.

感谢您的帮助.

谢谢！

推荐答案

这是我为您提供的解决方案:

Here is my solution for you :

1.首先制作图像的CCImage版本:

1.First make a CCImage version of your image:

I)来自文件:

CCImage *img=  new CCImage();
img->initWithImageFile("colors.png");

II)来自Sprite:

II) From Sprite :

• II.1)CCSprite->RenderTexture2D

• II.1) CCSprite -> RenderTexture2D

II.2)RenderTexture2D->CCImage( CCImage * testImage = RenderText2D-> newCCImage(); )

II.2) RenderTexture2D -> CCImage (CCImage *testImage = RenderText2D->newCCImage();)

2.然后您可以执行所需的操作:

2.Then You can do what you need :

    CCImage *img= ... // make CCImage from CCSprite
    int x=3;
    if(img->hasAlpha())
        x=4;

    unsigned char *data = new unsigned char[img->getDataLen()*x];   
    data = img->getData();
    // [0][0] => Left-Top Pixel !
    // But cocos2d Location Y-axis is Bottom(0) to Top(max)

    for(int i=0;i<img->getWidth();i++)
    {
        for(int j=0;j<img->getHeight();j++)
        {
            unsigned char *pixel = data + (i + j * img->getWidth()) * x;
            
           // You can see/change pixels' RGBA value(0-255) here !
            unsigned char r = *pixel;
            unsigned char g = *(pixel + 1);
            unsigned char b = *(pixel + 2) ;
            unsigned char a = *(pixel + 3);
        }
    }

3.然后，将其转换为texture_2D

3.Then, convert it to texture_2D

//CCImage -> Texture2d
    texture_2D= new CCTexture2D();
    texture_2D->initWithImage(img);

4.最后回到CCSprite

4.And Finally back to CCSprite

CCSprite *result=  CCSprite::createWithTexture(texture_2D);

这篇关于获取并设置CCSprite(cocos2d-x)中像素的RGB/RGBA值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！