At 12:34 PM 4/20/2001 -0700, Paul Rohr wrote:
>Thus, at the time I could run the same XP decoder to emit individual pixels,
>but I needed platform-specific routines to construct the necessary
>uncompressed buffers to bit-blast to the screen. Running that kind of
>process in reverse to get back to a PNG or JPEG sounds even more obnoxious.
>
>Is this not a problem any more? It'd be wonderful to hear that things have
>been standardized enough that you could hand the exact same uncompressed
>RGB(A) buffer to drawing routines on most or all of our supported platforms.
You are correct that Mac, Windows and Unix/X have slightly
different native representations of how the combination of RGBA pixels are
stored - but using a single ifdef in a header you have still have 100% XP
code. In fact, this is exactly what ImageMagick does. Here is the
declaration for a "PixelPacket":
typedef struct _PixelPacket
{
#if defined(WORDS_BIGENDIAN)
Quantum
red,
green,
blue,
opacity;
#else
#if defined(macintosh)
Quantum
opacity,
red,
green,
blue;
#else
Quantum
blue,
green,
red,
opacity;
#endif
#endif
} PixelPacket;
LDR
