237 lines
6.9 KiB
C++
237 lines
6.9 KiB
C++
/*
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* Copyright © 2009 Fredrik Höglund <fredrik@kde.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "halopainter_p.h"
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#include <QPainter>
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#include <cmath>
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static inline qreal gaussian(qreal x, qreal sigma)
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{
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return (1.0 / std::sqrt(2.0 * M_PI) * sigma)
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* std::exp(-((x * x) / (2.0 * sigma * sigma)));
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}
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static void gaussianBlur(QImage &image, int radius)
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{
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// The gaussian curve is effectively zero after 3 standard deviations.
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qreal sigma = radius / 3.;
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int size = radius * 2 + 1;
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int center = size / 2;
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qreal *kernel = new qreal[size];
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qreal total = 0;
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// Generate the gaussian kernel
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for (int i = 0; i < size; i++) {
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kernel[i] = gaussian(i - center, sigma);
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total += kernel[i];
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}
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// Normalize the kernel
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for (int i = 0; i < size; i++)
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kernel[i] = kernel[i] / total;
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quint32 *buf = new quint32[image.width() * image.height()];
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memset(buf, 0, image.width() * image.height() * sizeof(quint32));
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// Blur the image horizontally
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for (int y = 0; y < image.height(); y++)
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{
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quint32 *src = (quint32*)image.scanLine(y);
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quint32 *dst = buf + image.width() * y;
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for (int x = 0, start = center; x < center; x++, start--) {
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double a = 0;
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for (int i = start; i < size; i++)
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a += qAlpha(src[x - center + i]) * kernel[i];
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dst[x] = qRound(a) << 24;
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}
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for (int x = center; x < image.width() - center; x++) {
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double a = 0;
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for (int i = 0; i < size; i++)
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a += qAlpha(src[x - center + i]) * kernel[i];
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dst[x] = qRound(a) << 24;
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}
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for (int x = image.width() - center, stop = size - 1; x < image.width(); x++, stop--) {
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double a = 0;
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for (int i = 0; i < stop; i++)
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a += qAlpha(src[x - center + i]) * kernel[i];
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dst[x] = qRound(a) << 24;
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}
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}
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// Blur the image vertically
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quint32 *src = buf;
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quint32 *dst = (quint32*)image.bits();
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for (int x = 0; x < image.width(); x++)
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{
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int di = x;
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for (int y = 0, start = center; y < center; y++, start--) {
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double a = 0;
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int si = (y - center + start) * image.width() + x;
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for (int i = start; i < size; i++) {
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a += qAlpha(src[si]) * kernel[i];
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si += image.width();
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}
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dst[di] = qRound(a) << 24;
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di += image.width();
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}
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for (int y = center; y < image.height() - center; y++) {
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double a = 0;
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int si = (y - center) * image.width() + x;
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for (int i = 0; i < size; i++) {
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a += qAlpha(src[si]) * kernel[i];
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si += image.width();
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}
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dst[di] = qRound(a) << 24;
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di += image.width();
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}
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for (int y = image.height() - center, stop = size - 1; y < image.height(); y++, stop--) {
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double a = 0;
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int si = (y - center) * image.width() + x;
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for (int i = 0; i < stop; i++) {
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a += qAlpha(src[si]) * kernel[i];
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si += image.width();
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}
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dst[di] = qRound(a) << 24;
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di += image.width();
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}
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}
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delete [] buf;
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delete [] kernel;
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}
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// -----------------------------------------------------------------------
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TileSet::TileSet(const QPixmap &pixmap)
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{
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int tw = pixmap.width() / 3;
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int th = pixmap.height();
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for (int x = 0; x < 3; x++)
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tiles[x] = pixmap.copy(x * tw, 0, tw, th);
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}
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void TileSet::paint(QPainter *p, const QRect &r)
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{
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int tw = tiles[Left].width();
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int th = tiles[Left].height();
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int tw2 = tw * 2;
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if (r.width() < tw2) {
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int sw = r.width() / 2;
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p->drawPixmap(r.x(), r.y(), tiles[Left], 0, 0, sw, tiles[Left].height());
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p->drawPixmap(r.x() + sw, r.y(), tiles[Right], tw - sw, 0, sw, tiles[Right].height());
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} else {
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p->drawPixmap(r.topLeft(), tiles[Left]);
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if (r.width() - tw2 > 0)
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p->drawTiledPixmap(r.x() + tw, r.y(), r.width() - tw2, th, tiles[Center]);
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p->drawPixmap(r.right() - tw + 1, r.y(), tiles[Right]);
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}
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}
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// -----------------------------------------------------------------------
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HaloPainter *HaloPainter::s_instance = 0;
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HaloPainter::HaloPainter()
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: m_tileCache(16), m_haloCache(30)
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{
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}
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HaloPainter::~HaloPainter()
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{
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}
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TileSet *HaloPainter::tiles(int height) const
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{
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TileSet *tiles = m_tileCache.object(height);
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if (!tiles) {
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QImage image(64 * 3, height + 16, QImage::Format_ARGB32_Premultiplied);
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image.fill(0);
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QPainter p(&image);
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p.setRenderHint(QPainter::Antialiasing);
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p.setPen(Qt::NoPen);
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p.setBrush(Qt::white);
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p.drawRoundedRect(image.rect().adjusted(8, 8, -8, -8), height, height / 2);
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p.end();
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gaussianBlur(image, 8);
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p.begin(&image);
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p.setCompositionMode(QPainter::CompositionMode_SourceIn);
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p.fillRect(image.rect(), QColor(255, 255, 255, 255));
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p.end();
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tiles = new TileSet(QPixmap::fromImage(image));
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m_tileCache.insert(height, tiles);
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}
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return tiles;
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}
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void HaloPainter::paint(QPainter *painter, const QRect &textRect) const
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{
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int radius = textRect.height() / 2;
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const QRect hr = textRect.adjusted(-8 - radius, -9, 8 + radius, 9);
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int key = hr.width() << 16 | hr.height();
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QPixmap *pixmap = m_haloCache.object(key);
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if (!pixmap) {
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TileSet *halo = tiles(hr.height() - 16);
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pixmap = new QPixmap(hr.size());
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pixmap->fill(Qt::transparent);
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QPainter p(pixmap);
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p.setCompositionMode(QPainter::CompositionMode_Source);
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halo->paint(&p, pixmap->rect());
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QLinearGradient g(0, 0, pixmap->width(), 0);
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for (int i = 0; i <= 16; i++)
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g.setColorAt(i / 16., QColor(0, 0, 0, 164 * (1 - std::pow((i - 8) / 8., 2))));
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p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
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p.fillRect(pixmap->rect(), g);
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p.end();
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m_haloCache.insert(key, pixmap);
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}
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painter->drawPixmap(hr.topLeft(), *pixmap);
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}
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