86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "blur.h"
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void olive::ui::blur(QImage& result, const QRect& rect, int radius, bool alphaOnly) {
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int tab[] = { 14, 10, 8, 6, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2 };
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int alpha = (radius < 1) ? 16 : (radius > 17) ? 1 : tab[radius-1];
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int r1 = rect.top();
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int r2 = rect.bottom();
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int c1 = rect.left();
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int c2 = rect.right();
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int bpl = result.bytesPerLine();
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int rgba[4];
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unsigned char* p;
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int i1 = 0;
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int i2 = 3;
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if (alphaOnly)
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i1 = i2 = (QSysInfo::ByteOrder == QSysInfo::BigEndian ? 0 : 3);
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for (int col = c1; col <= c2; col++) {
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p = result.scanLine(r1) + col * 4;
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for (int i = i1; i <= i2; i++)
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rgba[i] = p[i] << 4;
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p += bpl;
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for (int j = r1; j < r2; j++, p += bpl)
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for (int i = i1; i <= i2; i++)
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p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
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}
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for (int row = r1; row <= r2; row++) {
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p = result.scanLine(row) + c1 * 4;
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for (int i = i1; i <= i2; i++)
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rgba[i] = p[i] << 4;
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p += 4;
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for (int j = c1; j < c2; j++, p += 4)
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for (int i = i1; i <= i2; i++)
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p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
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}
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for (int col = c1; col <= c2; col++) {
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p = result.scanLine(r2) + col * 4;
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for (int i = i1; i <= i2; i++)
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rgba[i] = p[i] << 4;
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p -= bpl;
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for (int j = r1; j < r2; j++, p -= bpl)
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for (int i = i1; i <= i2; i++)
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p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
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}
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for (int row = r1; row <= r2; row++) {
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p = result.scanLine(row) + c2 * 4;
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for (int i = i1; i <= i2; i++)
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rgba[i] = p[i] << 4;
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p -= 4;
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for (int j = c1; j < c2; j++, p -= 4)
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for (int i = i1; i <= i2; i++)
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p[i] = (rgba[i] += ((p[i] << 4) - rgba[i]) * alpha / 16) >> 4;
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}
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}
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