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