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/*
* This file is part of the KDE libraries
*
* Copyright (C) 2007 Germain Garand <germain@ebooksfrance.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
// The PaintBuffer class provides a shared buffer for efficient repetitive painting.
//
// It will grow to encompass the biggest size encountered, in order to avoid
// constantly resizing.
// When it grows over maxPixelBuffering, it periodically checks if such a size
// is still needed. If not, it shrinks down to the biggest size < maxPixelBuffering
// that was requested during the overflow lapse.
#ifndef html_paintbuffer_h
#define html_paintbuffer_h
#include <QPixmap>
#include <QStack>
#include <QPainter>
#include <QPaintEngine>
#include <kdebug.h>
#include <assert.h>
namespace khtml {
class BufferedPainter;
class BufferSweeper;
class PaintBuffer: public QObject
{
friend class khtml::BufferSweeper;
Q_OBJECT
public:
static const int maxPixelBuffering;
static const int leaseTime;
static const int cleanupTime;
static const int maxBuffers;
static QPixmap* grab( QSize s = QSize() );
static void release(QPixmap*p);
static void cleanup();
PaintBuffer();
void reset();
virtual void timerEvent(QTimerEvent* e);
private:
QPixmap* getBuf( QSize S );
static QStack<PaintBuffer*> *s_avail;
static QStack<PaintBuffer*> *s_grabbed;
static QStack<QPixmap*> *s_full;
static BufferSweeper *s_sweeper;
QPixmap m_buf;
bool m_overflow;
bool m_grabbed;
bool m_renewTimer;
int m_timer;
int m_resetWidth;
int m_resetHeight;
};
class BufferedPainter
{
public:
BufferedPainter(QPixmap* px, QPainter*& p, const QRegion &rr, bool replacePainter) {
QRect br = rr.boundingRect();
m_rect = br;
bool doFill = 1 || !px->hasAlphaChannel(); // shared pixmaps aren't properly cleared
// with Qt 4 + NVidia proprietary driver.
// So we can't use this optimization until
// we can detect this defect.
if (doFill)
px->fill(Qt::transparent);
m_painter.begin(px);
m_off = br.topLeft() + QPoint( static_cast<int>(p->worldTransform().dx()),
static_cast<int>(p->worldTransform().dy()));
m_painter.setWorldTransform(p->worldTransform());
m_painter.translate( -m_off );
m_painter.setClipRegion(m_region = rr);
//foreach(QRect rrr, m_region.rects())
// kDebug() << rrr;
if (!doFill) {
m_painter.setCompositionMode( QPainter::CompositionMode_Source );
m_painter.fillRect(br, Qt::transparent);
}
m_painter.setCompositionMode(p->compositionMode());
m_buf = px;
m_painter.setFont( p->font() );
m_painter.setBrush( p->brush() );
m_painter.setPen( p->pen() );
m_painter.setBackground( p->background() );
m_painter.setRenderHints( p->renderHints() );
// ### what else?
m_origPainter = p;
if (replacePainter)
p = &m_painter;
m_paused = false;
}
void transfer( float opacity ) {
// ### when using DestinationIn with an alpha above 0.99, the resulting buffer ends up black in Qt 4.5.1
bool constantOpacity = (opacity > 0.99) || (m_origPainter->paintEngine() && m_origPainter->paintEngine()->hasFeature(QPaintEngine::ConstantOpacity));
if (!constantOpacity) {
QColor color;
color.setAlphaF(opacity);
m_painter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
m_painter.fillRect(m_rect, color);
}
m_painter.end();
QTransform t = m_origPainter->worldTransform();
QPoint trans(static_cast<int>(t.dx()),static_cast<int>(t.dy()));
m_origPainter->save();
m_origPainter->resetTransform();
m_origPainter->setClipRegion(trans.isNull() ? m_region : m_region.translated(trans));
m_origPainter->setWorldTransform(t);
if (constantOpacity)
m_origPainter->setOpacity(opacity);
m_origPainter->drawPixmap(m_off-trans, *m_buf, QRect(0,0,m_rect.width(),m_rect.height()));
m_origPainter->restore();
}
static BufferedPainter* start(QPainter*&, const QRegion&);
static void end(QPainter*&, BufferedPainter* bp, float opacity=1.0);
const QPainter* painter() const { return &m_painter; }
QPainter* originalPainter() const { return m_origPainter; }
QPixmap* buffer() const { return m_buf; }
private:
bool m_paused;
QRect m_rect;
QRegion m_region;
QPoint m_off;
QPainter m_painter;
QPixmap* m_buf;
QPainter* m_origPainter;
};
}
#endif
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