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Katie image format optimization
from 2x faster to 3x compared to png, benchmark results bellow:
********* Start testing of tst_QImageReader *********
Config: Using QTest library 4.12.0, Katie 4.12.0
PASS : tst_QImageReader::initTestCase()
RESULT : tst_QImageReader::readImage():"bench.kat":
0.452 msecs per iteration (total: 226, iterations: 500)
RESULT : tst_QImageReader::readImage():"bench.pbm":
0.026 msecs per iteration (total: 13, iterations: 500)
RESULT : tst_QImageReader::readImage():"bench.png":
1.82 msecs per iteration (total: 912, iterations: 500)
RESULT : tst_QImageReader::readImage():"bench.ppm":
0.588 msecs per iteration (total: 294, iterations: 500)
RESULT : tst_QImageReader::readImage():"bench.svg":
10.80 msecs per iteration (total: 5,400, iterations: 500)
RESULT : tst_QImageReader::readImage():"bench.xpm":
8.172 msecs per iteration (total: 4,086, iterations: 500)
PASS : tst_QImageReader::readImage()
RESULT : tst_QImageReader::setScaledSize():"bench.kat":
1.95 msecs per iteration (total: 977, iterations: 500)
RESULT : tst_QImageReader::setScaledSize():"bench.pbm":
1.34 msecs per iteration (total: 671, iterations: 500)
RESULT : tst_QImageReader::setScaledSize():"bench.png":
3.328 msecs per iteration (total: 1,664, iterations: 500)
RESULT : tst_QImageReader::setScaledSize():"bench.ppm":
1.44 msecs per iteration (total: 720, iterations: 500)
RESULT : tst_QImageReader::setScaledSize():"bench.svg":
9.304 msecs per iteration (total: 4,652, iterations: 500)
RESULT : tst_QImageReader::setScaledSize():"bench.xpm":
9.730 msecs per iteration (total: 4,865, iterations: 500)
PASS : tst_QImageReader::setScaledSize()
PASS : tst_QImageReader::cleanupTestCase()
Totals: 4 passed, 0 failed, 0 skipped
********* Finished testing of tst_QImageReader *********
********* Start testing of tst_QImageWriter *********
Config: Using QTest library 4.12.0, Katie 4.12.0
PASS : tst_QImageWriter::initTestCase()
RESULT : tst_QImageWriter::writeImage():"kat":
2.428 msecs per iteration (total: 1,214, iterations: 500)
RESULT : tst_QImageWriter::writeImage():"png":
7.798 msecs per iteration (total: 3,899, iterations: 500)
RESULT : tst_QImageWriter::writeImage():"ppm":
6.954 msecs per iteration (total: 3,477, iterations: 500)
PASS : tst_QImageWriter::writeImage()
PASS : tst_QImageWriter::cleanupTestCase()
Totals: 3 passed, 0 failed, 0 skipped
********* Finished testing of tst_QImageWriter *********
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>