void TestKoIntegerMaths::UINT16Tests()
{
QCOMPARE((int)UINT16_MULT(0, 65535), 0);
QCOMPARE((int)UINT16_MULT(65535, 65535), 65535);
QCOMPARE((int)UINT16_MULT(32768, 65535), 32768);
QCOMPARE((int)UINT16_MULT(65535, 32768), 32768);
QCOMPARE((int)UINT16_MULT(1, 65535), 1);
QCOMPARE((int)UINT16_MULT(1, 32767), 0);
QCOMPARE((int)UINT16_MULT(16384, 32768), 8192);
QCOMPARE((int)UINT16_DIVIDE(65535, 65535), 65535);
QCOMPARE((int)UINT16_DIVIDE(16384, 32768), 32768);
QCOMPARE((int)UINT16_DIVIDE(1, 16384), 4);
QCOMPARE((int)UINT16_DIVIDE(0, 1), 0);
QCOMPARE((int)UINT16_BLEND(65535, 0, 0), 0);
// All these tests gave off-by one errors that apparently aren't
// errors.
// So -- are we officially expecting 32767 instead of 32768 and
// 49151 instead of 49152 here?
QCOMPARE((int)UINT16_BLEND(65535, 0, 32768), 32767);
QCOMPARE((int)UINT16_BLEND(65535, 32768, 32768), 49151);
QCOMPARE((int)UINT16_BLEND(32768, 16384, 65535), 32767);
}
void KoColorConversionToAlphaTransformation::transform(const quint8 *src, quint8 *dst, qint32 nPixels) const
{
quint16 data[4];
qint32 size = srcColorSpace()->pixelSize();
while (nPixels > 0) {
srcColorSpace()->toLabA16(src, (quint8*)data, 1);
*dst = UINT16_TO_UINT8(UINT16_MULT(data[0], data[3])); // L * A
src += size;
dst ++;
nPixels --;
}
}
