Marco van de Voort wrote:
Jakub Marian wrote:
The image format in the memory is clearly specified, as the main use of
this unit is to cooperate with OpenGL (for loading images, textures,
saving screenshots etc.). See TImage class comments, basically RawPixels
is simply a pointer to an array of Width * Height pixel values, and each
descendant of TImage specifies the exact layout of "pixel" --- e.g. for
TRGBImage a pixel is just 3 bytes, for red/green/blue.
Is the latter a hard requirement of OpenGL? In the fpimage rework, I had
hoped to skip 24-bit color and use 32-bit for that.
There is GL_RGBA format, combined with GL_UNSIGNED_BYTE this makes 32
bit pixel (with the last byte for storing alpha --- depending on what
you actually do with your image data, you may be able to simply ignore it).
Also, does OpenGL support bottom up (lines other way around in memory)
layouts, or only top down?
AFAIK, no. That is, OpenGL images always have the lowest row first in
the memory. Everyone simply swaps the rows in memory for OpenGL, since
all image formats have this the other way around.
Michalis
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