45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
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#include "runsmap.h"
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//---------------------------------------------------------------------------------------------
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void RunsMap::setRunLength(TPixelGR8 *pix, TUINT32 length) {
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TPixelGR8 *origPix = pix;
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pix = origPix;
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TPixelGR8 *pixRev = pix + length - 1;
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--length;
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if (length < 3)
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pix->value = pixRev->value = (length << 6);
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else {
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pix->value = pixRev->value = (3 << 6);
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++pix, --pixRev;
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if (length < 255)
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pix->value = pixRev->value = length;
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else {
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pix->value = pixRev->value = 255;
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++pix, pixRev -= 4;
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TUINT32 *l = (TUINT32 *)pix;
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*l = length;
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}
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}
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assert(runLength(origPix) == (length + 1));
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}
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//---------------------------------------------------------------------------------------------
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TUINT32 RunsMap::runLength(const TPixelGR8 *pix, bool reversed) const {
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int length = pix->value >> 6;
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if (length >= 3) {
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pix += (reversed) ? -1 : 1, length = pix->value;
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if (length >= 255) {
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pix += (reversed) ? -4 : 1;
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length = *(TUINT32 *)pix;
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}
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}
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return length + 1;
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}
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