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JBIG2 halftoning

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This commit is contained in:
Jakub Melka
2019-11-05 17:34:07 +01:00
parent 23d61dc8bc
commit 06e0036cda
3 changed files with 199 additions and 3 deletions
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3
PdfForQtLib/sources/pdfutils.h
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@ -325,6 +325,7 @@ unsigned char* convertByteArrayToUcharPtr(QByteArray& data)
/// License for this function is public domain.
inline constexpr uint8_t log2ceil(uint32_t value)
{
const uint32_t originalValue = value;
constexpr uint8_t MULTIPLY_DE_BRUIJN_BIT_POSITION[32] =
{
0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30,
@ -340,7 +341,7 @@ inline constexpr uint8_t log2ceil(uint32_t value)
uint8_t logarithm = MULTIPLY_DE_BRUIJN_BIT_POSITION[static_cast<uint32_t>((value * 0x07C4ACDDU) >> 27)];
// Ceil
if ((1U << logarithm) < value)
if ((1U << logarithm) < originalValue)
{
++logarithm;
}