// This function computes the distance from each component to the next one in bytes.
static
void ComputeIncrementsForChunky(cmsUInt32Number Format,
cmsUInt32Number ComponentStartingOrder[],
cmsUInt32Number ComponentPointerIncrements[])
{
cmsUInt32Number channels[cmsMAXCHANNELS];
int extra = T_EXTRA(Format);
int nchannels = T_CHANNELS(Format);
int total_chans = nchannels + extra;
int i;
int channelSize = trueBytesSize(Format);
int pixelSize = channelSize * total_chans;
// Sanity check
if (total_chans <= 0 || total_chans >= cmsMAXCHANNELS)
return;
memset(channels, 0, sizeof(channels));
// Separation is independent of starting point and only depends on channel size
for (i = 0; i < extra; i++)
ComponentPointerIncrements[i] = pixelSize;
// Handle do swap
for (i = 0; i < total_chans; i++)
{
if (T_DOSWAP(Format)) {
channels[i] = total_chans - i - 1;
}
else {
channels[i] = i;
}
}
// Handle swap first (ROL of positions), example CMYK -> KCMY | 0123 -> 3012
if (T_SWAPFIRST(Format) && total_chans > 1) {
cmsUInt32Number tmp = channels[0];
for (i = 0; i < total_chans-1; i++)
channels[i] = channels[i + 1];
channels[total_chans - 1] = tmp;
}
// Handle size
if (channelSize > 1)
for (i = 0; i < total_chans; i++) {
channels[i] *= channelSize;
}
for (i = 0; i < extra; i++)
ComponentStartingOrder[i] = channels[i + nchannels];
}
// On planar configurations, the distance is the stride added to any non-negative
static
void ComputeIncrementsForPlanar(cmsUInt32Number Format,
cmsUInt32Number BytesPerPlane,
cmsUInt32Number ComponentStartingOrder[],
cmsUInt32Number ComponentPointerIncrements[])
{
cmsUInt32Number channels[cmsMAXCHANNELS];
int extra = T_EXTRA(Format);
int nchannels = T_CHANNELS(Format);
int total_chans = nchannels + extra;
int i;
int channelSize = trueBytesSize(Format);
// Separation is independent of starting point and only depends on channel size
for (i = 0; i < extra; i++)
ComponentPointerIncrements[i] = channelSize;
// Handle do swap
for (i = 0; i < total_chans; i++)
{
if (T_DOSWAP(Format)) {
channels[i] = total_chans - i - 1;
}
else {
channels[i] = i;
}
}
// Handle swap first (ROL of positions), example CMYK -> KCMY | 0123 -> 3012
if (T_SWAPFIRST(Format)) {
cmsUInt32Number tmp = channels[0];
for (i = 0; i < total_chans - 1; i++)
channels[i] = channels[i + 1];
channels[total_chans - 1] = tmp;
}
// Handle size
for (i = 0; i < total_chans; i++) {
channels[i] *= BytesPerPlane;
}
for (i = 0; i < extra; i++)
ComponentStartingOrder[i] = channels[i + nchannels];
}
