GET/PUT image header example
Example showing the two different headers used for image buffers.
Note: `ImageInfo` is provided as a simpler alternative to reading the image structures directly.
`
'' fbgfx.bi contains the necessary structures and constants for working
'' directly with image headers
#include "fbgfx.bi"
'' in lang fb, structures and constants are contained in the FB namespace
#if __FB_LANG__ = "fb"
Using FB
#endif
'' function to show info on an image
Sub show_image_info( ByVal img As Any Ptr )
Dim As PUT_HEADER Ptr header ' IMAGE can also be use instead of PUT_HEADER
Dim As Integer w, h, bpp, pitch
header = img
If( header->Type = PUT_HEADER_NEW ) Then
Print "New style header"
w = header->Width
h = header->height
bpp = header->bpp
pitch = header->pitch
Else
Print "Old style header"
w = header->old.width
h = header->old.height
bpp = header->old.bpp
pitch = w * bpp
End If
Print "Image dimensions are " & w & "*" & h
Print "Image uses " & bpp & " bytes for each pixel"
Print "A row of image pixels takes " & pitch & " bytes"
End Sub
Dim As Any Ptr picture
ScreenRes 320, 200, 32
picture = ImageCreate( 10, 10, RGB(128, 192, 255) )
Put( 40, 40 ), picture, PSet
show_image_info( picture )
ImageDestroy picture
Sleep
`
NOTE: To use this code with an array, pass your array to the function, like this:
`
show_image_info( VarPtr( myarray( L ) ) )
`
where L is the lower bound of myarray().