Thread: CBitmap + big images = bad?

there must be some trick... because photoshop can view the images... you see, we want to be able to see the whole image [zoomed out of course] and be able to see at 100% as well [obviously this would just be a small region of the image]... so i'm going to have to make a smaller image from the big image... i guess for 1/8 size i could just create a new image.... and use every 8th pixel value horizontally and vertically.... and then depending on zoom value... 1/4 size would be every 4th pixel or something... but it seems a bit inefficient to me to have to create a new bitmap from the large data every time you scroll/zoom.... i dunno.... i think of something hopefully...

Sorry, we are in acceptance testing, again, so very busy...

>>but have you ever blitted from multiple back buffers to a displayed DC that has a world transform applied to it,

Have not done a lot with world transforms on multiple or composite images.
Should work, would probably have to use some overlap and experiment to get it aligned.

StretchBlt() will not work IMHO. The results will be poor (even with HALFTONE set) and the drawing slow. Best results would be achived with int multiples.

Use a image lib that has some good, fast image resizing functions for jpg's (ImageSource by Small Animals Software). I use this to resize the area of an image for zoom ect. My stuff is designed for 56k internet and so uses small compressed images.