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// krazy:exclude=copyright (email of Maxim is missing)
/*
This file is a part of the KDE project
SPDX-FileCopyrightText: 2006 Zack Rusin <zack@kde.org>
SPDX-FileCopyrightText: 2006-2007, 2008 Fredrik Höglund <fredrik@kde.org>
The stack blur algorithm was invented by Mario Klingemann <mario@quasimondo.com>
This implementation is based on the version in Anti-Grain Geometry Version 2.4,
SPDX-FileCopyrightText: 2002-2005 Maxim Shemanarev <http://www.antigrain.com>
SPDX-License-Identifier: BSD-2-Clause
*/
#include "imagefilter.h"
#include <QColor>
#include <QImage>
#include <QPainter>
#include <cmath>
#include <string.h>
static const quint32 stack_blur8_mul[255] = {
512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292, 512, 454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312,
292, 273, 512, 482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259, 496, 475, 456, 437, 420, 404, 388, 374, 360, 347, 335, 323, 312,
302, 292, 282, 273, 265, 512, 497, 482, 468, 454, 441, 428, 417, 405, 394, 383, 373, 364, 354, 345, 337, 328, 320, 312, 305, 298, 291, 284, 278,
271, 265, 259, 507, 496, 485, 475, 465, 456, 446, 437, 428, 420, 412, 404, 396, 388, 381, 374, 367, 360, 354, 347, 341, 335, 329, 323, 318, 312,
307, 302, 297, 292, 287, 282, 278, 273, 269, 265, 261, 512, 505, 497, 489, 482, 475, 468, 461, 454, 447, 441, 435, 428, 422, 417, 411, 405, 399,
394, 389, 383, 378, 373, 368, 364, 359, 354, 350, 345, 341, 337, 332, 328, 324, 320, 316, 312, 309, 305, 301, 298, 294, 291, 287, 284, 281, 278,
274, 271, 268, 265, 262, 259, 257, 507, 501, 496, 491, 485, 480, 475, 470, 465, 460, 456, 451, 446, 442, 437, 433, 428, 424, 420, 416, 412, 408,
404, 400, 396, 392, 388, 385, 381, 377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344, 341, 338, 335, 332, 329, 326, 323, 320, 318, 315, 312,
310, 307, 304, 302, 299, 297, 294, 292, 289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259};
static const quint32 stack_blur8_shr[255] = {
9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19,
19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24};
inline static void blurHorizontal(QImage &image, unsigned int *stack, int div, int radius)
{
int stackindex;
int stackstart;
quint32 *const pixels = reinterpret_cast<quint32 *>(image.bits());
quint32 pixel;
int w = image.width();
int h = image.height();
int wm = w - 1;
unsigned int mul_sum = stack_blur8_mul[radius];
unsigned int shr_sum = stack_blur8_shr[radius];
unsigned int sum, sum_in, sum_out;
for (int y = 0; y < h; y++) {
sum = 0;
sum_in = 0;
sum_out = 0;
const int yw = y * w;
pixel = pixels[yw];
for (int i = 0; i <= radius; i++) {
stack[i] = qAlpha(pixel);
sum += stack[i] * (i + 1);
sum_out += stack[i];
}
for (int i = 1; i <= radius; i++) {
pixel = pixels[yw + qMin(i, wm)];
unsigned int *stackpix = &stack[i + radius];
*stackpix = qAlpha(pixel);
sum += *stackpix * (radius + 1 - i);
sum_in += *stackpix;
}
stackindex = radius;
for (int x = 0, i = yw; x < w; x++) {
pixels[i++] = (((sum * mul_sum) >> shr_sum) << 24) & 0xff000000;
sum -= sum_out;
stackstart = stackindex + div - radius;
if (stackstart >= div)
stackstart -= div;
unsigned int *stackpix = &stack[stackstart];
sum_out -= *stackpix;
pixel = pixels[yw + qMin(x + radius + 1, wm)];
*stackpix = qAlpha(pixel);
sum_in += *stackpix;
sum += sum_in;
if (++stackindex >= div)
stackindex = 0;
stackpix = &stack[stackindex];
sum_out += *stackpix;
sum_in -= *stackpix;
} // for (x = 0, ...)
} // for (y = 0, ...)
}
inline static void blurVertical(QImage &image, unsigned int *stack, int div, int radius)
{
int stackindex;
int stackstart;
quint32 *const pixels = reinterpret_cast<quint32 *>(image.bits());
quint32 pixel;
int w = image.width();
int h = image.height();
int hm = h - 1;
int mul_sum = stack_blur8_mul[radius];
int shr_sum = stack_blur8_shr[radius];
unsigned int sum, sum_in, sum_out;
for (int x = 0; x < w; x++) {
sum = 0;
sum_in = 0;
sum_out = 0;
pixel = pixels[x];
for (int i = 0; i <= radius; i++) {
stack[i] = qAlpha(pixel);
sum += stack[i] * (i + 1);
sum_out += stack[i];
}
for (int i = 1; i <= radius; i++) {
pixel = pixels[qMin(i, hm) * w + x];
unsigned int *stackpix = &stack[i + radius];
*stackpix = qAlpha(pixel);
sum += *stackpix * (radius + 1 - i);
sum_in += *stackpix;
}
stackindex = radius;
for (int y = 0, i = x; y < h; y++, i += w) {
pixels[i] = (((sum * mul_sum) >> shr_sum) << 24) & 0xff000000;
sum -= sum_out;
stackstart = stackindex + div - radius;
if (stackstart >= div)
stackstart -= div;
unsigned int *stackpix = &stack[stackstart];
sum_out -= *stackpix;
pixel = pixels[qMin(y + radius + 1, hm) * w + x];
*stackpix = qAlpha(pixel);
sum_in += *stackpix;
sum += sum_in;
if (++stackindex >= div)
stackindex = 0;
stackpix = &stack[stackindex];
sum_out += *stackpix;
sum_in -= *stackpix;
} // for (y = 0, ...)
} // for (x = 0, ...)
}
static void stackBlur(QImage &image, float radius)
{
radius = qRound(radius);
int div = int(radius * 2) + 1;
unsigned int *stack = new unsigned int[div];
blurHorizontal(image, stack, div, radius);
blurVertical(image, stack, div, radius);
delete[] stack;
}
void ImageFilter::shadowBlur(QImage &image, float radius, const QColor &color)
{
if (radius < 0)
return;
if (radius > 0)
stackBlur(image, radius);
// Correct the color and opacity of the shadow
QPainter p(&image);
p.setCompositionMode(QPainter::CompositionMode_SourceIn);
p.fillRect(image.rect(), color);
}
// kate: space-indent on; indent-width 4; replace-tabs on;
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