commit f3500e03ae6410248524975336749eacc6fc9cc0
Author: Koji Yokota <[email protected]>
Date: Thu Jun 11 19:16:25 2026 +0900
Fix the model of mixing two alpha values
At least,
1) mixing two transparents should be transparent and
2) mixing two opaques should be opaque
---
src/frontends/qt/ColorCache.cpp | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/src/frontends/qt/ColorCache.cpp b/src/frontends/qt/ColorCache.cpp
index 0949c2f3da..135c2f362a 100644
--- a/src/frontends/qt/ColorCache.cpp
+++ b/src/frontends/qt/ColorCache.cpp
@@ -132,16 +132,18 @@ ColorPair ColorCache::getAll(Color const & color, bool
syscolors) const
merge_colors.first.toRgb().green()) / 2,
(base_colors.first.toRgb().blue() +
merge_colors.first.toRgb().blue()) / 2,
- (base_colors.first.toRgb().alpha() +
- merge_colors.first.toRgb().alpha()) / 2),
+ std::round(
+ (1 - (1 -
base_colors.first.toRgb().alphaF()) *
+ (1 -
merge_colors.first.toRgb().alphaF())) * 255)),
QColor((base_colors.second.toRgb().red() +
merge_colors.second.toRgb().red()) / 2,
(base_colors.second.toRgb().green() +
merge_colors.second.toRgb().green()) / 2,
(base_colors.second.toRgb().blue() +
merge_colors.second.toRgb().blue()) / 2,
- (base_colors.second.toRgb().alpha() +
- merge_colors.second.toRgb().alpha()) / 2),
+ std::round(
+ (1 - (1 -
base_colors.second.toRgb().alphaF()) *
+ (1 -
merge_colors.second.toRgb().alphaF())) * 255)),
};
}
// used by branches
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