diff options
author | Allan Sandfeld Jensen <allan.jensen@qt.io> | 2024-03-06 11:56:15 +0100 |
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committer | Allan Sandfeld Jensen <allan.jensen@qt.io> | 2024-04-05 18:40:47 +0200 |
commit | 04e5b86f9e695e2ca4516179a214d2eff6a2157e (patch) | |
tree | 198dd7bf3897d213f05786e4ef6905edd581adaf /src/gui/painting/qcolortrclut.cpp | |
parent | 05b84673045a5f4432a6caa9bea08d8fba1e1a03 (diff) |
Make QColorTrcLut more flexible
Make it possible to generate one way QColorTrcLut tables, and make it
easier test out different table size,
Change-Id: I953c68d772699de87fdddbf15ce196e6ba8b9898
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Diffstat (limited to 'src/gui/painting/qcolortrclut.cpp')
-rw-r--r-- | src/gui/painting/qcolortrclut.cpp | 77 |
1 files changed, 57 insertions, 20 deletions
diff --git a/src/gui/painting/qcolortrclut.cpp b/src/gui/painting/qcolortrclut.cpp index 6f1cacea75..8a7673bc00 100644 --- a/src/gui/painting/qcolortrclut.cpp +++ b/src/gui/painting/qcolortrclut.cpp @@ -13,43 +13,80 @@ std::shared_ptr<QColorTrcLut> QColorTrcLut::create() return std::make_shared<Access>(); } -std::shared_ptr<QColorTrcLut> QColorTrcLut::fromGamma(qreal gamma) +std::shared_ptr<QColorTrcLut> QColorTrcLut::fromGamma(qreal gamma, Direction dir) { auto cp = create(); + cp->setFromGamma(gamma, dir); + return cp; +} - for (int i = 0; i <= (255 * 16); ++i) { - cp->m_toLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), gamma) * (255 * 256))); - cp->m_fromLinear[i] = ushort(qRound(qPow(i / qreal(255 * 16), qreal(1) / gamma) * (255 * 256))); - } - +std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferFunction(const QColorTransferFunction &fun, Direction dir) +{ + auto cp = create(); + cp->setFromTransferFunction(fun, dir); return cp; } -std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferFunction(const QColorTransferFunction &fun) +std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferTable(const QColorTransferTable &table, Direction dir) { auto cp = create(); - QColorTransferFunction inv = fun.inverted(); + cp->setFromTransferTable(table, dir); + return cp; +} - for (int i = 0; i <= (255 * 16); ++i) { - cp->m_toLinear[i] = ushort(qRound(fun.apply(i / qreal(255 * 16)) * (255 * 256))); - cp->m_fromLinear[i] = ushort(qRound(inv.apply(i / qreal(255 * 16)) * (255 * 256))); +void QColorTrcLut::setFromGamma(qreal gamma, Direction dir) +{ + if (dir & ToLinear) { + if (!m_toLinear) + m_toLinear.reset(new ushort[Resolution + 1]); + for (int i = 0; i <= Resolution; ++i) + m_toLinear[i] = ushort(qRound(qPow(i / qreal(Resolution), gamma) * (255 * 256))); } - return cp; + if (dir & FromLinear) { + if (!m_fromLinear) + m_fromLinear.reset(new ushort[Resolution + 1]); + for (int i = 0; i <= Resolution; ++i) + m_fromLinear[i] = ushort(qRound(qPow(i / qreal(Resolution), qreal(1) / gamma) * (255 * 256))); + } } -std::shared_ptr<QColorTrcLut> QColorTrcLut::fromTransferTable(const QColorTransferTable &table) +void QColorTrcLut::setFromTransferFunction(const QColorTransferFunction &fun, Direction dir) { - auto cp = create(); + if (dir & ToLinear) { + if (!m_toLinear) + m_toLinear.reset(new ushort[Resolution + 1]); + for (int i = 0; i <= Resolution; ++i) + m_toLinear[i] = ushort(qRound(fun.apply(i / qreal(Resolution)) * (255 * 256))); + } - float minInverse = 0.0f; - for (int i = 0; i <= (255 * 16); ++i) { - cp->m_toLinear[i] = ushort(qBound(0, qRound(table.apply(i / qreal(255 * 16)) * (255 * 256)), 65280)); - minInverse = table.applyInverse(i / qreal(255 * 16), minInverse); - cp->m_fromLinear[i] = ushort(qBound(0, qRound(minInverse * (255 * 256)), 65280)); + if (dir & FromLinear) { + if (!m_fromLinear) + m_fromLinear.reset(new ushort[Resolution + 1]); + QColorTransferFunction inv = fun.inverted(); + for (int i = 0; i <= Resolution; ++i) + m_fromLinear[i] = ushort(qRound(inv.apply(i / qreal(Resolution)) * (255 * 256))); } +} - return cp; +void QColorTrcLut::setFromTransferTable(const QColorTransferTable &table, Direction dir) +{ + if (dir & ToLinear) { + if (!m_toLinear) + m_toLinear.reset(new ushort[Resolution + 1]); + for (int i = 0; i <= Resolution; ++i) + m_toLinear[i] = ushort(qBound(0, qRound(table.apply(i / qreal(Resolution)) * (255 * 256)), 65280)); + } + + if (dir & FromLinear) { + if (!m_fromLinear) + m_fromLinear.reset(new ushort[Resolution + 1]); + float minInverse = 0.0f; + for (int i = 0; i <= Resolution; ++i) { + minInverse = table.applyInverse(i / qreal(Resolution), minInverse); + m_fromLinear[i] = ushort(qBound(0, qRound(minInverse * (255 * 256)), 65280)); + } + } } QT_END_NAMESPACE |