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| author | Miklos Vajna <vmiklos@collabora.com> | 2021-11-29 08:28:28 +0100 |
|---|---|---|
| committer | Miklos Vajna <vmiklos@collabora.com> | 2022-06-27 08:58:25 +0200 |
| commit | bad177d0604b76672af2612cf8ab39f8e8345dc7 (patch) | |
| tree | f08ea25ab3270d85046e32097b63895682580eaa /tools/source | |
| parent | 4ed228b81d9d051addda86a4394ed2ad878cf34d (diff) | |
tools Color: implement MSO-style luminance modulation/offset filter
To be used when a filtered theme color will be applied on the UI, and
not at PPTX import time.
(cherry picked from commit 8662293d17a875f4389ea21be00e768e3de3d048)
Change-Id: Ifb56e38e59b529ef436063c407ee156d76a77f9c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136371
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Diffstat (limited to 'tools/source')
| -rw-r--r-- | tools/source/generic/color.cxx | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tools/source/generic/color.cxx b/tools/source/generic/color.cxx index cf4e084b722f..5df32719eb2c 100644 --- a/tools/source/generic/color.cxx +++ b/tools/source/generic/color.cxx @@ -230,4 +230,36 @@ void Color::ApplyTintOrShade(sal_Int16 n100thPercent) B = sal_uInt8(std::lround(aBColor.getBlue() * 255.0)); } +void Color::ApplyLumModOff(sal_Int16 nMod, sal_Int16 nOff) +{ + if (nMod == 10000 && nOff == 0) + { + return; + } + // Switch to HSL, where applying these transforms is easier. + basegfx::BColor aBColor = basegfx::utils::rgb2hsl(getBColor()); + + // 50% is half luminance, 200% is double luminance. Unit is 100th percent. + aBColor.setBlue(std::clamp(aBColor.getBlue() * nMod / 10000, 0.0, 1.0)); + // If color changes to black or white, it will stay gray if luminance changes again. + if ((aBColor.getBlue() == 0.0) || (aBColor.getBlue() == 1.0)) + { + aBColor.setGreen(0.0); + } + + // Luminance offset means hue and saturation is left unchanged. Unit is 100th percent. + aBColor.setBlue(std::clamp(aBColor.getBlue() + static_cast<double>(nOff) / 10000, 0.0, 1.0)); + // If color changes to black or white, it will stay gray if luminance changes again. + if ((aBColor.getBlue() == 0.0) || (aBColor.getBlue() == 1.0)) + { + aBColor.setGreen(0.0); + } + + // Switch back to RGB. + aBColor = basegfx::utils::hsl2rgb(aBColor); + R = sal_uInt8(std::lround(aBColor.getRed() * 255.0)); + G = sal_uInt8(std::lround(aBColor.getGreen() * 255.0)); + B = sal_uInt8(std::lround(aBColor.getBlue() * 255.0)); +} + /* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |