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kwin/effects/magnifier/magnifier.cpp
Martin Gräßlin b5279af212 Bring back the magnifier effect 
Effect uses framebuffer blit to copy the zoomed are in a scaled
way into an offscreen texture and render the texture after the
rendering. This means instead of two rendering passes we now need
only one pass, but require the blit extension.
2011-08-20 10:58:43 +02:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
Copyright (C) 2007 Christian Nitschkowski <christian.nitschkowski@kdemail.net>
Copyright (C) 2011 Martin Gräßlin <mgraesslin@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "magnifier.h"
#include <kwinconfig.h>
#include <kaction.h>
#include <kactioncollection.h>
#include <kconfiggroup.h>
#include <kstandardaction.h>
#include <kwinglutils.h>
namespace KWin
{
KWIN_EFFECT(magnifier, MagnifierEffect)
KWIN_EFFECT_SUPPORTED(magnifier, MagnifierEffect::supported())
const int FRAME_WIDTH = 5;
MagnifierEffect::MagnifierEffect()
: zoom(1)
, target_zoom(1)
, polling(false)
, m_texture(0)
, m_fbo(0)
{
KActionCollection* actionCollection = new KActionCollection(this);
KAction* a;
a = static_cast< KAction* >(actionCollection->addAction(KStandardAction::ZoomIn, this, SLOT(zoomIn())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Equal));
a = static_cast< KAction* >(actionCollection->addAction(KStandardAction::ZoomOut, this, SLOT(zoomOut())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_Minus));
a = static_cast< KAction* >(actionCollection->addAction(KStandardAction::ActualSize, this, SLOT(toggle())));
a->setGlobalShortcut(KShortcut(Qt::META + Qt::Key_0));
connect(effects, SIGNAL(mouseChanged(QPoint,QPoint,Qt::MouseButtons,Qt::MouseButtons,Qt::KeyboardModifiers,Qt::KeyboardModifiers)),
this, SLOT(slotMouseChanged(QPoint,QPoint,Qt::MouseButtons,Qt::MouseButtons,Qt::KeyboardModifiers,Qt::KeyboardModifiers)));
reconfigure(ReconfigureAll);
}
MagnifierEffect::~MagnifierEffect()
{
delete m_fbo;
delete m_texture;
}
bool MagnifierEffect::supported()
{
return effects->compositingType() == OpenGLCompositing && GLRenderTarget::blitSupported();
}
void MagnifierEffect::reconfigure(ReconfigureFlags)
{
KConfigGroup conf = EffectsHandler::effectConfig("Magnifier");
int width, height;
width = conf.readEntry("Width", 200);
height = conf.readEntry("Height", 200);
magnifier_size = QSize(width, height);
}
void MagnifierEffect::prePaintScreen(ScreenPrePaintData& data, int time)
{
if (zoom != target_zoom) {
double diff = time / animationTime(500.0);
if (target_zoom > zoom)
zoom = qMin(zoom * qMax(1 + diff, 1.2), target_zoom);
else
zoom = qMax(zoom * qMin(1 - diff, 0.8), target_zoom);
}
effects->prePaintScreen(data, time);
if (zoom != 1.0)
data.paint |= magnifierArea().adjusted(-FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH);
}
void MagnifierEffect::paintScreen(int mask, QRegion region, ScreenPaintData& data)
{
effects->paintScreen(mask, region, data); // paint normal screen
if (zoom != 1.0) {
// get the right area from the current rendered screen
const QRect area = magnifierArea();
const QPoint cursor = cursorPos();
m_fbo->blitFromFramebuffer(QRect(cursor.x() - (double)area.width() / (zoom*2), cursor.y() - (double)area.height() / (zoom*2),
(double)area.width() / zoom, (double)area.height() / zoom));
// paint magnifier
m_texture->bind();
m_texture->render(infiniteRegion(), area);
m_texture->unbind();
QVector<float> verts;
GLVertexBuffer *vbo = GLVertexBuffer::streamingBuffer();
vbo->reset();
vbo->setColor(QColor(0, 0, 0));
// top frame
verts << area.right() + FRAME_WIDTH << area.top() - FRAME_WIDTH;
verts << area.left() - FRAME_WIDTH << area.top() - FRAME_WIDTH;
verts << area.left() - FRAME_WIDTH << area.top() - 1;
verts << area.left() - FRAME_WIDTH << area.top() - 1;
verts << area.right() + FRAME_WIDTH << area.top() - 1;
verts << area.right() + FRAME_WIDTH << area.top() - FRAME_WIDTH;
// left frame
verts << area.left() - 1 << area.top() - FRAME_WIDTH;
verts << area.left() - FRAME_WIDTH << area.top() - FRAME_WIDTH;
verts << area.left() - FRAME_WIDTH << area.bottom() + FRAME_WIDTH;
verts << area.left() - FRAME_WIDTH << area.bottom() + FRAME_WIDTH;
verts << area.left() - 1 << area.bottom() + FRAME_WIDTH;
verts << area.left() - 1 << area.top() - FRAME_WIDTH;
// right frame
verts << area.right() + FRAME_WIDTH << area.top() - FRAME_WIDTH;
verts << area.right() + 1 << area.top() - FRAME_WIDTH;
verts << area.right() + 1 << area.bottom() + FRAME_WIDTH;
verts << area.right() + 1 << area.bottom() + FRAME_WIDTH;
verts << area.right() + FRAME_WIDTH << area.bottom() + FRAME_WIDTH;
verts << area.right() + FRAME_WIDTH << area.top() - FRAME_WIDTH;
// bottom frame
verts << area.right() + FRAME_WIDTH << area.bottom() + 1;
verts << area.left() - FRAME_WIDTH << area.bottom() + 1;
verts << area.left() - FRAME_WIDTH << area.bottom() + FRAME_WIDTH;
verts << area.left() - FRAME_WIDTH << area.bottom() + FRAME_WIDTH;
verts << area.right() + FRAME_WIDTH << area.bottom() + FRAME_WIDTH;
verts << area.right() + FRAME_WIDTH << area.bottom() + 1;
vbo->setData(verts.size() / 2, 2, verts.constData(), NULL);
if (ShaderManager::instance()->isValid()) {
ShaderManager::instance()->pushShader(ShaderManager::ColorShader);
}
vbo->render(GL_TRIANGLES);
if (ShaderManager::instance()->isValid()) {
ShaderManager::instance()->popShader();
}
}
}
void MagnifierEffect::postPaintScreen()
{
if (zoom != target_zoom) {
QRect framedarea = magnifierArea().adjusted(-FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH);
effects->addRepaint(framedarea);
}
effects->postPaintScreen();
}
QRect MagnifierEffect::magnifierArea(QPoint pos) const
{
return QRect(pos.x() - magnifier_size.width() / 2, pos.y() - magnifier_size.height() / 2,
magnifier_size.width(), magnifier_size.height());
}
void MagnifierEffect::zoomIn()
{
target_zoom *= 1.2;
if (!polling) {
polling = true;
effects->startMousePolling();
}
if (!m_texture) {
m_texture = new GLTexture(magnifier_size);
m_texture->setYInverted(false);
m_fbo = new GLRenderTarget(m_texture);
}
effects->addRepaint(magnifierArea().adjusted(-FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH));
}
void MagnifierEffect::zoomOut()
{
target_zoom /= 1.2;
if (target_zoom < 1) {
target_zoom = 1;
if (polling) {
polling = false;
effects->stopMousePolling();
}
delete m_fbo;
delete m_texture;
m_fbo = NULL;
m_texture = NULL;
}
effects->addRepaint(magnifierArea().adjusted(-FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH));
}
void MagnifierEffect::toggle()
{
if (target_zoom == 1.0) {
target_zoom = 2;
if (!polling) {
polling = true;
effects->startMousePolling();
}
if (!m_texture) {
m_texture = new GLTexture(magnifier_size);
m_texture->setYInverted(false);
m_fbo = new GLRenderTarget(m_texture);
}
} else {
target_zoom = 1;
if (polling) {
polling = false;
effects->stopMousePolling();
}
delete m_fbo;
delete m_texture;
m_fbo = NULL;
m_texture = NULL;
}
effects->addRepaint(magnifierArea().adjusted(-FRAME_WIDTH, -FRAME_WIDTH, FRAME_WIDTH, FRAME_WIDTH));
}
void MagnifierEffect::slotMouseChanged(const QPoint& pos, const QPoint& old,
Qt::MouseButtons, Qt::MouseButtons, Qt::KeyboardModifiers, Qt::KeyboardModifiers)
{
if (pos != old && zoom != 1)
// need full repaint as we might lose some change events on fast mouse movements
// see Bug 187658
effects->addRepaintFull();
}
} // namespace
#include "magnifier.moc"
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