Large Images appear blank?
Posted on Sun, 2010-02-21 19:47
When I create a newImage with say "background.png" or "background.jpg" if the width is under 900px or so it shows up fine on the iPhone, but when it is any larger (tested around 1200px) then it shows up as just a white box. It looks fine in the simulator but not the phone. Anyone else noticed this?
Replies
Posted on Wed, 2010-03-10 15:54
#2
I have the same, and I think its not just a problem with pictures.
If U create a bigger "display" with rectangles, text, lines and so on , its getting very very slow!
Posted on Thu, 2010-03-25 01:30
#3
The largest possible texture size on the iPhone is 1024 x 1024, so no single bitmap can be larger than that. If you load a larger image, Corona will auto-resize it.
Also note that the iPhone only has 10MB of texture memory in total, and all image data is stored uncompressed (24 bits per pixel). If you exceed this memory threshold, it starts swapping texture data between the GPU and normal memory, which can be a lot slower than keeping everything on the GPU buffer.
In general, image memory is a limiting factor on the iPhone. However, there are features that would make this memory easier to manage, such as texture atlases and tiling, and we're working on that for future releases.
Posted on Thu, 2010-03-25 02:35
#4
In the past (corona 1.1) images seemed to be resized if under the 1024 threshold, there was talk of a true / false param when loading images to get Corona to stop resizing, ie I could load one 640,480 image (basically 2 x 320x480 images) without any resizing. Can I do this in 1.1.3?
can you send me the images to info@anscamobile.com and sample code as well.
c