feat: 添加ElaWidgetTool库

ElaWidgetTools/private/ElaExponentialBlurPrivate.cpp

@@ -0,0 +1,102 @@
+#include "ElaExponentialBlurPrivate.h"
+
+#include <QPixmap>
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+#include <cmath>
+#endif
+int ElaExponentialBlurPrivate::_aprec = 12;
+int ElaExponentialBlurPrivate::_zprec = 7;
+ElaExponentialBlurPrivate::ElaExponentialBlurPrivate(QObject* parent)
+    : QObject{parent}
+{
+}
+
+ElaExponentialBlurPrivate::~ElaExponentialBlurPrivate()
+{
+}
+
+void ElaExponentialBlurPrivate::_drawExponentialBlur(QImage& image, const quint16& qRadius)
+{
+    if (qRadius < 1)
+    {
+        return;
+    }
+    image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
+    int alpha = (int)((1 << _aprec) * (1.0f - std::exp(-2.3f / (qRadius + 1.f))));
+    int height = image.height();
+    int width = image.width();
+    for (int row = 0; row < height; row++)
+    {
+        _drawRowBlur(image, row, alpha);
+    }
+
+    for (int col = 0; col < width; col++)
+    {
+        _drawColumnBlur(image, col, alpha);
+    }
+}
+
+void ElaExponentialBlurPrivate::_drawRowBlur(QImage& image, const int& row, const int& alpha)
+{
+    int zR, zG, zB, zA;
+
+    QRgb* ptr = (QRgb*)image.scanLine(row);
+    int width = image.width();
+
+    zR = *((unsigned char*)ptr) << _zprec;
+    zG = *((unsigned char*)ptr + 1) << _zprec;
+    zB = *((unsigned char*)ptr + 2) << _zprec;
+    zA = *((unsigned char*)ptr + 3) << _zprec;
+
+    for (int index = 0; index < width; index++)
+    {
+        _drawInnerBlur((unsigned char*)&ptr[index], zR, zG, zB, zA, alpha);
+    }
+    for (int index = width - 2; index >= 0; index--)
+    {
+        _drawInnerBlur((unsigned char*)&ptr[index], zR, zG, zB, zA, alpha);
+    }
+}
+
+void ElaExponentialBlurPrivate::_drawColumnBlur(QImage& image, const int& column, const int& alpha)
+{
+    int zR, zG, zB, zA;
+
+    QRgb* ptr = (QRgb*)image.bits();
+    ptr += column;
+    int height = image.height();
+    int width = image.width();
+
+    zR = *((unsigned char*)ptr) << _zprec;
+    zG = *((unsigned char*)ptr + 1) << _zprec;
+    zB = *((unsigned char*)ptr + 2) << _zprec;
+    zA = *((unsigned char*)ptr + 3) << _zprec;
+
+    for (int index = width; index < (height - 1) * width; index += width)
+    {
+        _drawInnerBlur((unsigned char*)&ptr[index], zR, zG, zB, zA, alpha);
+    }
+    for (int index = (height - 2) * width; index >= 0; index -= width)
+    {
+        _drawInnerBlur((unsigned char*)&ptr[index], zR, zG, zB, zA, alpha);
+    }
+}
+
+void ElaExponentialBlurPrivate::_drawInnerBlur(unsigned char* bptr, int& zR, int& zG, int& zB, int& zA, int alpha)
+{
+    int R, G, B, A;
+    R = *bptr;
+    G = *(bptr + 1);
+    B = *(bptr + 2);
+    A = *(bptr + 3);
+
+    zR += (alpha * ((R << _zprec) - zR)) >> _aprec;
+    zG += (alpha * ((G << _zprec) - zG)) >> _aprec;
+    zB += (alpha * ((B << _zprec) - zB)) >> _aprec;
+    zA += (alpha * ((A << _zprec) - zA)) >> _aprec;
+
+    *bptr = zR >> _zprec;
+    *(bptr + 1) = zG >> _zprec;
+    *(bptr + 2) = zB >> _zprec;
+    *(bptr + 3) = zA >> _zprec;
+}