在 Objective-C 中将 RGB 数据转换为位图可可

Question

我有一个 RGB 无符号字符缓冲区，我想将其转换为位图文件，有人知道如何吗？

我的 RGB 浮点数的格式如下

R [(0,0)], G[(0,0)], B[(0,0)],R [(0,1)], G[(0,1) )], B[(0,1)], R [(0,2)], G[(0,2)], B[(0,2)] .....

各数据单元的取值范围从 0 到 255。有人知道我如何进行这种转换吗？

Answer 1

您可以使用 CGBitmapContextCreate 从原始数据创建位图上下文。然后您可以从位图上下文创建 CGImageRef 并保存它。不幸的是 CGBitmapContextCreate 对数据的格式有点挑剔。它不支持 24 位 RGB 数据。开始时的循环将 rgb 数据混合为 rgba，最后将 alpha 值设置为零。您必须包含并链接到 ApplicationServices 框架。

char* rgba = (char*)malloc(width*height*4);
for(int i=0; i < width*height; ++i) {
    rgba[4*i] = myBuffer[3*i];
    rgba[4*i+1] = myBuffer[3*i+1];
    rgba[4*i+2] = myBuffer[3*i+2];
    rgba[4*i+3] = 0;
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef bitmapContext = CGBitmapContextCreate(
    rgba,
    width,
    height,
    8, // bitsPerComponent
    4*width, // bytesPerRow
    colorSpace,
    kCGImageAlphaNoneSkipLast);

CFRelease(colorSpace);

CGImageRef cgImage = CGBitmapContextCreateImage(bitmapContext);
CFURLRef url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, CFSTR("image.png"), kCFURLPOSIXPathStyle, false);

CFStringRef type = kUTTypePNG; // or kUTTypeBMP if you like
CGImageDestinationRef dest = CGImageDestinationCreateWithURL(url, type, 1, 0);

CGImageDestinationAddImage(dest, cgImage, 0);

CFRelease(cgImage);
CFRelease(bitmapContext);
CGImageDestinationFinalize(dest);
free(rgba);

Answer 2

借用 nschmidt 的代码来生成一个熟悉的、如果有人红了眼睛的图像：

int width = 11;
int height = 8;

Byte r[8][11]={
    {000,000,255,000,000,000,000,000,255,000,000},
    {000,000,000,255,000,000,000,255,000,000,000},  
    {000,000,255,255,255,255,255,255,255,000,000},
    {000,255,255,255,255,255,255,255,255,255,000},
    {255,255,255,255,255,255,255,255,255,255,255},
    {255,000,255,255,255,255,255,255,255,000,255},
    {255,000,255,000,000,000,000,000,255,000,255},
    {000,000,000,255,255,000,255,255,000,000,000}};

Byte g[8][11]={
    {000,000,255,000,000,000,000,000,255,000,000},
    {000,000,000,255,000,000,000,255,000,000,000},  
    {000,000,255,255,255,255,255,255,255,000,000},
    {000,255,255,000,255,255,255,000,255,255,000},
    {255,255,255,255,255,255,255,255,255,255,255},
    {255,000,255,255,255,255,255,255,255,000,255},
    {255,000,255,000,000,000,000,000,255,000,255},
    {000,000,000,255,255,000,255,255,000,000,000}};

Byte b[8][11]={
    {000,000,255,000,000,000,000,000,255,000,000},
    {000,000,000,255,000,000,000,255,000,000,000},  
    {000,000,255,255,255,255,255,255,255,000,000},
    {000,255,255,000,255,255,255,000,255,255,000},
    {255,255,255,255,255,255,255,255,255,255,255},
    {255,000,255,255,255,255,255,255,255,000,255},
    {255,000,255,000,000,000,000,000,255,000,255},
    {000,000,000,255,255,000,255,255,000,000,000}};

char* rgba = (char*)malloc(width*height*4);
int offset=0;
for(int i=0; i < height; ++i) 
{
    for (int j=0; j < width; j++) 
    {
        rgba[4*offset]   = r[i][j];
        rgba[4*offset+1] = g[i][j];
        rgba[4*offset+2] = b[i][j];
        rgba[4*offset+3] = 0;
        offset ++;
    }
}


CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef bitmapContext = CGBitmapContextCreate(
                                                   rgba,
                                                   width,
                                                   height,
                                                   8, // bitsPerComponent
                                                   4*width, // bytesPerRow
                                                   colorSpace,
                                                   kCGImageAlphaNoneSkipLast);

CFRelease(colorSpace);

CGImageRef cgImage = CGBitmapContextCreateImage(bitmapContext);

free(rgba);

UIImage *newUIImage = [UIImage imageWithCGImage:cgImage];

UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 11,8)];

[iv setImage:newUIImage];

然后，addSubview:iv 将图像放入您的视图中，当然，执行必要的 [releases]< /code> 保持房子干净。