cocos2dx3.X uiimage 转 texture2d 或者 image 失败

最新推荐文章于 2022-07-27 11:10:37 发布

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最新推荐文章于 2022-07-27 11:10:37 发布

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文章标签： cocos2d-x uiimage

本文链接：https://blog.youkuaiyun.com/YiTong_Zhang/article/details/75093795

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在尝试将UIImage转换为cocos2d-x的Texture2D或Image时遇到错误，报空指针。尝试了多种网络上的转换方法，但都以失败告终。错误出现在void* data转换为unsighe char* data的过程中。代码示例显示了两种常见的转换失败情况，均在初始化Texture2D时出错。

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今天试了网络上各种流行的转法，最终结果都是失败告终。

在void* data类型转到unsighe char* data过程中报错，直接报空指针。

类似失败代码1：

//    uiimage 转 texture2d 等的都会出现错误错误原因未知
    cocos2d :: Texture2D *texture = new cocos2d :: Texture2D ();

    CGImageRef imageRef = [( UIImage *)pImage CGImage ];
    NSUInteger width = CGImageGetWidth (imageRef);
    NSUInteger height = CGImageGetHeight (imageRef);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB ();
    unsigned char * rawData = ( unsigned char *) calloc (height * width * 4 , sizeof ( unsigned char ));
    NSUInteger bytesPerPixel = 4 ;
    NSUInteger bytesPerRow = bytesPerPixel * width;
    NSUInteger bitsPerComponent = 8 ;
    CGContextRef context = CGBitmapContextCreate (rawData, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );
    CGColorSpaceRelease (colorSpace);
    CGContextDrawImage (context, CGRectMake ( 0 , 0 , width, height), imageRef);
    CGContextRelease (context);

    if (texture-> initWithData (rawData, height * width * 4 , cocos2d :: Texture2D :: PixelFormat :: RGBA8888 , ( int )width, ( int )height, cocos2d :: Size (width, height)))
    {
        if ( ROLE_MANAGER -> saveImageForFileName (texture)) {
            CCLOG ( " image success to save !~" );
            texture-> autorelease ();
            flag = true ;
        }
        else {
            CCLOG ( " image fail to save !~" );

        }
    }
    else {
        CCLOG ( " uiimage transfrom is fail!~ init error. " );

    }

    if (!flag)

delete texture;

类似代码2：

cocos2d :: Image *image = new ( std :: nothrow ) cocos2d :: Image ();
    cocos2d :: Texture2D *texture = new cocos2d :: Texture2D ();


//    if (image->initWithRawData((unsigned char*)pData, pLength, pWidth, pHeight, 4)) {
//        if (ROLE_MANAGER->saveImageForFileName(image)) {

    if (texture-> initWithData (pData, pLength, cocos2d :: Texture2D :: PixelFormat :: RGBA8888 , pWidth, pHeight, cocos2d :: Size (pWidth, pHeight))) {
        if ( ROLE_MANAGER -> saveImageForFileName (texture)) {
            CCLOG ( " image success to save !~" );
            image-> autorelease ();
            flag = true ;
        }
        else {
            CCLOG ( " image fail to save !~" );

        }
    }
    else {
        CCLOG ( " uiimage transfrom is fail!~ init error. " );

}