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use YCbCr for chesboard pattern

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Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>
This commit is contained in:
Trial97 2025-01-16 14:11:56 +02:00
parent aa6518410e
commit d2516cbecc
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1 changed files with 41 additions and 6 deletions
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47
launcher/ui/dialogs/skins/draw/SkinOpenGLWidget.cpp
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@ -23,6 +23,7 @@
#include <QVector2D>
#include <QVector3D>
#include <QtMath>
#include <cmath>
#include "minecraft/skins/SkinModel.h"
#include "ui/dialogs/skins/SkinManageDialog.h"
@ -187,16 +188,49 @@ void SkinOpenGLWidget::updateCape(const QImage& cape)
}
}
QImage generateChessboardImage(int width, int height, int tileSize)
QVector3D RGBToYCbCr(QColor rgb)
{
auto fr = rgb.redF() / 255.f;
auto fg = rgb.greenF() / 255.f;
auto fb = rgb.blueF() / 255.F;
auto Y = 0.2989f * fr + 0.5866f * fg + 0.1145f * fb;
auto Cb = -0.1687f * fr - 0.3313f * fg + 0.5000f * fb;
auto Cr = 0.5000f * fr - 0.4184f * fg - 0.0816f * fb;
return QVector3D(Y, Cb, Cr);
}
QColor YCbCrToRGB(QVector3D ycbcr)
{
auto r = qBound(0.0f, ycbcr.x() + 0.0000f * ycbcr.y() + 1.4022f * ycbcr.z(), 1.0f);
auto g = qBound(0.0f, ycbcr.x() - 0.3456f * ycbcr.y() - 0.7145f * ycbcr.z(), 1.0f);
auto b = qBound(0.0f, ycbcr.x() + 1.7710f * ycbcr.y() + 0.0000f * ycbcr.z(), 1.0f);
return QColor::fromRgb(r * 255, g * 255, b * 255);
}
QColor calculateContrastingColor(const QColor& color)
{
constexpr float contrast = 0.07;
auto lab = RGBToYCbCr(color);
if (lab.x() < contrast) {
lab.setX(lab.x() + contrast);
} else {
lab.setX(lab.x() - contrast);
}
return YCbCrToRGB(lab);
}
QImage generateChessboardImage(int width, int height, int tileSize, QColor baseColor)
{
QImage image(width, height, QImage::Format_RGB888);
auto white = baseColor;
auto black = calculateContrastingColor(baseColor);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
bool isWhite = ((x / tileSize) % 2) == ((y / tileSize) % 2);
unsigned char color = isWhite ? 100 : 50;
image.setPixelColor(x, y, QColor(color, color, color));
image.setPixelColor(x, y, isWhite ? white : black);
}
}
return image;
@ -204,7 +238,8 @@ QImage generateChessboardImage(int width, int height, int tileSize)
void SkinOpenGLWidget::generateBackgroundTexture(int width, int height, int tileSize)
{
m_backgroundTexture = new QOpenGLTexture(generateChessboardImage(width, height, tileSize));
m_backgroundTexture =
new QOpenGLTexture(generateChessboardImage(width, height, tileSize, palette().color(QPalette::Normal, QPalette::Base)));
m_backgroundTexture->setMinificationFilter(QOpenGLTexture::Nearest);
m_backgroundTexture->setMagnificationFilter(QOpenGLTexture::Nearest);
}