kwin/shadow.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
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 "shadow.h"
// kwin
#include "atoms.h"
#include "composite.h"
#include "effects.h"
#include "toplevel.h"
namespace KWin
{
Shadow::Shadow(Toplevel *toplevel)
: m_topLevel(toplevel)
, m_cachedSize(toplevel->geometry().size())
{
connect(m_topLevel, SIGNAL(geometryChanged()), SLOT(geometryChanged()));
}
Shadow::~Shadow()
{
}
Shadow *Shadow::createShadow(Toplevel *toplevel)
{
if (!effects) {
return NULL;
}
auto data = Shadow::readX11ShadowProperty(toplevel->window());
if (!data.isEmpty()) {
Shadow *shadow = Compositor::self()->scene()->createShadow(toplevel);
if (!shadow->init(data)) {
delete shadow;
return NULL;
}
if (toplevel->effectWindow() && toplevel->effectWindow()->sceneWindow()) {
toplevel->effectWindow()->sceneWindow()->updateShadow(shadow);
}
return shadow;
} else {
return NULL;
}
}
QVector< uint32_t > Shadow::readX11ShadowProperty(xcb_window_t id)
{
QVector<uint32_t> ret;
Xcb::Property property(false, id, atoms->kde_net_wm_shadow, XCB_ATOM_CARDINAL, 0, 12);
uint32_t *shadow = property.value<uint32_t*>();
if (shadow) {
ret.reserve(12);
for (int i=0; i<12; ++i) {
ret << shadow[i];
}
}
return ret;
}
bool Shadow::init(const QVector< uint32_t > &data)
{
QVector<Xcb::WindowGeometry> pixmapGeometries(ShadowElementsCount);
QVector<xcb_get_image_cookie_t> getImageCookies(ShadowElementsCount);
auto *c = connection();
for (int i = 0; i < ShadowElementsCount; ++i) {
pixmapGeometries[i] = Xcb::WindowGeometry(data[i]);
}
auto discardReplies = [&getImageCookies](int start) {
for (int i = start; i < getImageCookies.size(); ++i) {
xcb_discard_reply(connection(), getImageCookies.at(i).sequence);
}
};
for (int i = 0; i < ShadowElementsCount; ++i) {
auto &geo = pixmapGeometries[i];
if (geo.isNull()) {
discardReplies(0);
return false;
}
getImageCookies[i] = xcb_get_image_unchecked(c, XCB_IMAGE_FORMAT_Z_PIXMAP, data[i],
0, 0, geo->width, geo->height, ~0);
}
for (int i = 0; i < ShadowElementsCount; ++i) {
auto *reply = xcb_get_image_reply(c, getImageCookies.at(i), nullptr);
if (!reply) {
discardReplies(i+1);
return false;
}
auto &geo = pixmapGeometries[i];
QImage image(xcb_get_image_data(reply), geo->width, geo->height, QImage::Format_ARGB32);
m_shadowElements[i] = QPixmap::fromImage(image);
free(reply);
}
m_topOffset = data[ShadowElementsCount];
m_rightOffset = data[ShadowElementsCount+1];
m_bottomOffset = data[ShadowElementsCount+2];
m_leftOffset = data[ShadowElementsCount+3];
updateShadowRegion();
if (!prepareBackend()) {
return false;
}
buildQuads();
return true;
}
void Shadow::updateShadowRegion()
{
const QRect top(0, - m_topOffset, m_topLevel->width(), m_topOffset);
const QRect right(m_topLevel->width(), - m_topOffset, m_rightOffset, m_topLevel->height() + m_topOffset + m_bottomOffset);
const QRect bottom(0, m_topLevel->height(), m_topLevel->width(), m_bottomOffset);
const QRect left(- m_leftOffset, - m_topOffset, m_leftOffset, m_topLevel->height() + m_topOffset + m_bottomOffset);
m_shadowRegion = QRegion(top).united(right).united(bottom).united(left);
}
void Shadow::buildQuads()
{
// prepare window quads
m_shadowQuads.clear();
const QSize top(m_shadowElements[ShadowElementTop].size());
const QSize topRight(m_shadowElements[ShadowElementTopRight].size());
const QSize right(m_shadowElements[ShadowElementRight].size());
const QSize bottomRight(m_shadowElements[ShadowElementBottomRight].size());
const QSize bottom(m_shadowElements[ShadowElementBottom].size());
const QSize bottomLeft(m_shadowElements[ShadowElementBottomLeft].size());
const QSize left(m_shadowElements[ShadowElementLeft].size());
const QSize topLeft(m_shadowElements[ShadowElementTopLeft].size());
if ((left.width() - m_leftOffset > m_topLevel->width()) ||
(right.width() - m_rightOffset > m_topLevel->width()) ||
(top.height() - m_topOffset > m_topLevel->height()) ||
(bottom.height() - m_bottomOffset > m_topLevel->height())) {
// if our shadow is bigger than the window, we don't render the shadow
m_shadowRegion = QRegion();
return;
}
const QRect outerRect(QPoint(-m_leftOffset, -m_topOffset), QPoint(m_topLevel->width() + m_rightOffset, m_topLevel->height() + m_bottomOffset));
WindowQuad topLeftQuad(WindowQuadShadowTopLeft);
topLeftQuad[ 0 ] = WindowVertex(outerRect.x(), outerRect.y(), 0.0, 0.0);
topLeftQuad[ 1 ] = WindowVertex(outerRect.x() + topLeft.width(), outerRect.y(), 1.0, 0.0);
topLeftQuad[ 2 ] = WindowVertex(outerRect.x() + topLeft.width(), outerRect.y() + topLeft.height(), 1.0, 1.0);
topLeftQuad[ 3 ] = WindowVertex(outerRect.x(), outerRect.y() + topLeft.height(), 0.0, 1.0);
m_shadowQuads.append(topLeftQuad);
WindowQuad topQuad(WindowQuadShadowTop);
topQuad[ 0 ] = WindowVertex(outerRect.x() + topLeft.width(), outerRect.y(), 0.0, 0.0);
topQuad[ 1 ] = WindowVertex(outerRect.right() - topRight.width(), outerRect.y(), 1.0, 0.0);
topQuad[ 2 ] = WindowVertex(outerRect.right() - topRight.width(), outerRect.y() + top.height(), 1.0, 1.0);
topQuad[ 3 ] = WindowVertex(outerRect.x() + topLeft.width(), outerRect.y() + top.height(), 0.0, 1.0);
m_shadowQuads.append(topQuad);
WindowQuad topRightQuad(WindowQuadShadowTopRight);
topRightQuad[ 0 ] = WindowVertex(outerRect.right() - topRight.width(), outerRect.y(), 0.0, 0.0);
topRightQuad[ 1 ] = WindowVertex(outerRect.right(), outerRect.y(), 1.0, 0.0);
topRightQuad[ 2 ] = WindowVertex(outerRect.right(), outerRect.y() + topRight.height(), 1.0, 1.0);
topRightQuad[ 3 ] = WindowVertex(outerRect.right() - topRight.width(), outerRect.y() + topRight.height(), 0.0, 1.0);
m_shadowQuads.append(topRightQuad);
WindowQuad rightQuad(WindowQuadShadowRight);
rightQuad[ 0 ] = WindowVertex(outerRect.right() - right.width(), outerRect.y() + topRight.height(), 0.0, 0.0);
rightQuad[ 1 ] = WindowVertex(outerRect.right(), outerRect.y() + topRight.height(), 1.0, 0.0);
rightQuad[ 2 ] = WindowVertex(outerRect.right(), outerRect.bottom() - bottomRight.height(), 1.0, 1.0);
rightQuad[ 3 ] = WindowVertex(outerRect.right() - right.width(), outerRect.bottom() - bottomRight.height(), 0.0, 1.0);
m_shadowQuads.append(rightQuad);
WindowQuad bottomRightQuad(WindowQuadShadowBottomRight);
bottomRightQuad[ 0 ] = WindowVertex(outerRect.right() - bottomRight.width(), outerRect.bottom() - bottomRight.height(), 0.0, 0.0);
bottomRightQuad[ 1 ] = WindowVertex(outerRect.right(), outerRect.bottom() - bottomRight.height(), 1.0, 0.0);
bottomRightQuad[ 2 ] = WindowVertex(outerRect.right(), outerRect.bottom(), 1.0, 1.0);
bottomRightQuad[ 3 ] = WindowVertex(outerRect.right() - bottomRight.width(), outerRect.bottom(), 0.0, 1.0);
m_shadowQuads.append(bottomRightQuad);
WindowQuad bottomQuad(WindowQuadShadowBottom);
bottomQuad[ 0 ] = WindowVertex(outerRect.x() + bottomLeft.width(), outerRect.bottom() - bottom.height(), 0.0, 0.0);
bottomQuad[ 1 ] = WindowVertex(outerRect.right() - bottomRight.width(), outerRect.bottom() - bottom.height(), 1.0, 0.0);
bottomQuad[ 2 ] = WindowVertex(outerRect.right() - bottomRight.width(), outerRect.bottom(), 1.0, 1.0);
bottomQuad[ 3 ] = WindowVertex(outerRect.x() + bottomLeft.width(), outerRect.bottom(), 0.0, 1.0);
m_shadowQuads.append(bottomQuad);
WindowQuad bottomLeftQuad(WindowQuadShadowBottomLeft);
bottomLeftQuad[ 0 ] = WindowVertex(outerRect.x(), outerRect.bottom() - bottomLeft.height(), 0.0, 0.0);
bottomLeftQuad[ 1 ] = WindowVertex(outerRect.x() + bottomLeft.width(), outerRect.bottom() - bottomLeft.height(), 1.0, 0.0);
bottomLeftQuad[ 2 ] = WindowVertex(outerRect.x() + bottomLeft.width(), outerRect.bottom(), 1.0, 1.0);
bottomLeftQuad[ 3 ] = WindowVertex(outerRect.x(), outerRect.bottom(), 0.0, 1.0);
m_shadowQuads.append(bottomLeftQuad);
WindowQuad leftQuad(WindowQuadShadowLeft);
leftQuad[ 0 ] = WindowVertex(outerRect.x(), outerRect.y() + topLeft.height(), 0.0, 0.0);
leftQuad[ 1 ] = WindowVertex(outerRect.x() + left.width(), outerRect.y() + topLeft.height(), 1.0, 0.0);
leftQuad[ 2 ] = WindowVertex(outerRect.x() + left.width(), outerRect.bottom() - bottomLeft.height(), 1.0, 1.0);
leftQuad[ 3 ] = WindowVertex(outerRect.x(), outerRect.bottom() - bottomLeft.height(), 0.0, 1.0);
m_shadowQuads.append(leftQuad);
}
bool Shadow::updateShadow()
{
auto data = Shadow::readX11ShadowProperty(m_topLevel->window());
if (data.isEmpty()) {
if (m_topLevel && m_topLevel->effectWindow() && m_topLevel->effectWindow()->sceneWindow() &&
m_topLevel->effectWindow()->sceneWindow()->shadow()) {
m_topLevel->effectWindow()->sceneWindow()->updateShadow(0);
m_topLevel->effectWindow()->buildQuads(true);
}
deleteLater();
return false;
}
init(data);
if (m_topLevel && m_topLevel->effectWindow())
m_topLevel->effectWindow()->buildQuads(true);
return true;
}
void Shadow::setToplevel(Toplevel *topLevel)
{
m_topLevel = topLevel;
connect(m_topLevel, SIGNAL(geometryChanged()), SLOT(geometryChanged()));
}
void Shadow::geometryChanged()
{
if (m_cachedSize == m_topLevel->geometry().size()) {
return;
}
m_cachedSize = m_topLevel->geometry().size();
updateShadowRegion();
buildQuads();
}
} // namespace