Question

I have a raw image buffer in the RGB format. I need to draw it to CGContext so that I get a new buffer of the format ARGB. I accomplish this in the following way:

Create a data provider out of raw buffer using CGDataProviderCreateWithData and then create image out of the data provider with the api: CGImageCreate.

Now if I write this image back to the CGBitmapContext using CGContextImageDraw.

Instead of creating an intermediate image, is there any way of writing the buffer directly to CGContext so that I can avoid the image creation phase?

Thanks

Answer 1

If you are using a CGBitmapContext then you can get a pointer to the bitmap buffer using the CGBitmapContextGetData() function. You can then write your data directly to the buffer.