Question

我正在尝试根据另一个Sprite制作黑白Sprite。由于我在创建和缓存之后无法访问精灵像素数据，因此我通过创建一个新的Image来解决它，然后更改图像数据，然后转动{{1} }再次进入Image然后再进入Texture，现在又变成了黑白。

问题在于，当我使用从Sprite生成的Image时，它实际上并没有绘制它，但是当我使用RenderTexture之后生成的png图像时，它工作良好。

似乎我应该能够在RenderTexture::saveToFile上看到output_sprite就好了，因为它的构建方式大致相同，唯一的区别是scene是从现有构建的磁盘上的文件与Image中的文件相对。

RenderTexture

除了GPU在cocos2d::Sprite* anvil_sprite = cocos2d::Sprite::createWithSpriteFrameName("anvil.png"); anvil_sprite->setAnchorPoint(Vec2::ZERO); anvil_sprite->setPosition(0,0); RenderTexture* rt = RenderTexture::create(anvil_sprite->getContentSize().width, anvil_sprite->getContentSize().height); rt->begin(); anvil_sprite->visit(); rt->end(); //generates a file so I can confirm it's generating correctly in the OS's //image viewer rt->saveToFile("test_FILE.png"); Image* output_image = new Image; // Either use the png generated from a previous run's RenderTexture (which works) // or use a new Image generated on this run. // If I use the existing png, this works as intended, but I'd like to be // able to use the texture I generate right away instead of needing to save // it to disk first /* OPTION A */ output_image->initWithImageFile("test_FILE.png"); // works /* OPTION B */ output_image = rt->newImage(); //doesn't render anything auto output_texture = new Texture2D; output_texture->initWithImage(output_image); Sprite* output_sprite = cocos2d::Sprite::createWithTexture(output_texture); scene->addChild(output_sprite);中使用纹理之前没有机会渲染纹理，我真的不确定会发生什么。我正在寻找选项A和B两者以相同的方式呈现，但是现在只有具有预先存在的文件作为Sprite的源的那个正在工作。

Answer 1

试试这个：

auto anvil_sprite = cocos2d::Sprite::create("player.png");
anvil_sprite->setAnchorPoint(Vec2::ZERO);

auto rt = RenderTexture::create(anvil_sprite->getTexture()->getPixelsWide(), anvil_sprite->getTexture()->getPixelsHigh());
rt->begin();
//Draw
anvil_sprite->visit();
rt->end();

cocos2d::Director::getInstance()->getRenderer()->render();

auto img = rt->newImage(); //Generate Image
auto texture = new cocos2d::Texture2D();
texture->initWithImage(img); //Texture sprite

auto sp = cocos2d::Sprite::createWithTexture(texture); //New Sprite
sp->setPosition(cocos2d::Director::getInstance()->getWinSize().width, cocos2d::Director::getInstance()->getWinSize().height);
this->addChild(sp);

可以使用“getData”访问同一精灵的像素，并使用循环或memset编辑此向量，因为你想要它...

auto anvil_sprite = cocos2d::Sprite::create("player.png");
anvil_sprite->setAnchorPoint(Vec2::ZERO);

auto rt = RenderTexture::create(anvil_sprite->getTexture()->getPixelsWide(), anvil_sprite->getTexture()->getPixelsHigh());
rt->begin();
anvil_sprite->visit();
rt->end();

cocos2d::Director::getInstance()->getRenderer()->render();

auto img = rt->newImage(); //Generate Image

auto data = img->getData();
for (size_t i = 0; i < img->getDataLen(); i++)
{
    data[i] = 400;
}
//memset(data, 400, img->getDataLen());

我对像素“颜色”了解不多，但如果你愿意，你可以在colors中记录一些自己; 0

RenderTexture创建的图像不可见

1 个答案: