Loading large image in parts in Timage component

3
votes

I have a large images on server. When user request for any one I download them on to the client machine and once it is complete I load it into Timage control.

Now what client is requesting that the image must come in chunks(parts) and as soon as a chunk is downloaded it must be shown in Timage control and as soon as other chunk downloaded it must be appended to previously loaded image.

I am not getting how to proceed for the same. I am using Delphi 2006

1
delphiimage-processingtimage
What is the format of the images on the server? Bitmap? Jpeg? - skamradt
its jpeg image that I am trying to load - Mohit Vashistha
How are those images going to be displayed? I guess that unless you have such a huge screen resolution, or very poor download speed, you should be capable to download a full screen image very fast and therefore you shouldn't need to show it in chunks. Do you want to be able to navigate in the image, like google maps does? - Trinidad
Yes they are basically Geo referenced maps, and yes I have to replicated the Gmaps effect - Mohit Vashistha

1 Answers

1
votes

Create bm, an empty (whiter or black) TBitmap with the same size as the entire image. Then download each cell of the image one by one. When a new cell is downloaded, draw it (for instance, using BitBlt or Draw) on the right part of bm.