kwin/src/decorationitem.cpp

274 lines
7.8 KiB
C++
Raw Normal View History

/*
SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "decorationitem.h"
#include "abstract_client.h"
#include "abstract_output.h"
#include "composite.h"
#include "decorations/decoratedclient.h"
#include "deleted.h"
#include "scene.h"
2022-01-18 08:35:52 +00:00
#include "utils/common.h"
#include <cmath>
#include <KDecoration2/Decoration>
#include <KDecoration2/DecoratedClient>
#include <QPainter>
namespace KWin
{
DecorationRenderer::DecorationRenderer(Decoration::DecoratedClientImpl *client)
: m_client(client)
, m_imageSizesDirty(true)
{
connect(client->decoration(), &KDecoration2::Decoration::damaged,
this, &DecorationRenderer::addDamage);
connect(client->decoration(), &KDecoration2::Decoration::bordersChanged,
this, &DecorationRenderer::invalidate);
connect(client->decoratedClient(), &KDecoration2::DecoratedClient::sizeChanged,
this, &DecorationRenderer::invalidate);
invalidate();
}
Decoration::DecoratedClientImpl *DecorationRenderer::client() const
{
return m_client;
}
void DecorationRenderer::invalidate()
{
if (m_client) {
addDamage(m_client->client()->rect());
}
m_imageSizesDirty = true;
}
QRegion DecorationRenderer::damage() const
{
return m_damage;
}
void DecorationRenderer::addDamage(const QRegion &region)
{
m_damage += region;
Q_EMIT damaged(region);
}
void DecorationRenderer::resetDamage()
{
m_damage = QRegion();
}
qreal DecorationRenderer::effectiveDevicePixelRatio() const
{
// QPainter won't let paint with a device pixel ratio less than 1.
return std::max(qreal(1.0), devicePixelRatio());
}
qreal DecorationRenderer::devicePixelRatio() const
{
return m_devicePixelRatio;
}
void DecorationRenderer::setDevicePixelRatio(qreal dpr)
{
if (m_devicePixelRatio != dpr) {
m_devicePixelRatio = dpr;
invalidate();
}
}
QImage DecorationRenderer::renderToImage(const QRect &geo)
{
Q_ASSERT(m_client);
// Guess the pixel format of the X pixmap into which the QImage will be copied.
QImage::Format format;
const int depth = client()->client()->depth();
switch (depth) {
case 30:
format = QImage::Format_A2RGB30_Premultiplied;
break;
case 24:
case 32:
format = QImage::Format_ARGB32_Premultiplied;
break;
default:
qCCritical(KWIN_CORE) << "Unsupported client depth" << depth;
format = QImage::Format_ARGB32_Premultiplied;
break;
};
QImage image(geo.width() * m_devicePixelRatio, geo.height() * m_devicePixelRatio, format);
image.setDevicePixelRatio(m_devicePixelRatio);
image.fill(Qt::transparent);
QPainter p(&image);
p.setRenderHint(QPainter::Antialiasing);
p.setWindow(QRect(geo.topLeft(), geo.size() * effectiveDevicePixelRatio()));
p.setClipRect(geo);
renderToPainter(&p, geo);
return image;
}
void DecorationRenderer::renderToPainter(QPainter *painter, const QRect &rect)
{
client()->decoration()->paint(painter, rect);
}
DecorationItem::DecorationItem(KDecoration2::Decoration *decoration, AbstractClient *window, Item *parent)
: Item(parent)
, m_window(window)
{
m_renderer.reset(Compositor::self()->scene()->createDecorationRenderer(window->decoratedClient()));
connect(window, &Toplevel::frameGeometryChanged,
this, &DecorationItem::handleFrameGeometryChanged);
connect(window, &Toplevel::windowClosed,
this, &DecorationItem::handleWindowClosed);
connect(window, &Toplevel::screenChanged,
this, &DecorationItem::handleOutputChanged);
connect(decoration, &KDecoration2::Decoration::bordersChanged,
this, &DecorationItem::discardQuads);
connect(renderer(), &DecorationRenderer::damaged,
this, &DecorationItem::scheduleRepaint);
setSize(window->size());
handleOutputChanged();
}
void DecorationItem::preprocess()
{
const QRegion damage = m_renderer->damage();
if (!damage.isEmpty()) {
m_renderer->render(damage);
m_renderer->resetDamage();
}
}
void DecorationItem::handleOutputChanged()
{
if (m_output) {
disconnect(m_output, &AbstractOutput::scaleChanged, this, &DecorationItem::handleOutputScaleChanged);
}
m_output = m_window->output();
if (m_output) {
handleOutputScaleChanged();
connect(m_output, &AbstractOutput::scaleChanged, this, &DecorationItem::handleOutputScaleChanged);
}
}
void DecorationItem::handleOutputScaleChanged()
{
const qreal dpr = m_output->scale();
if (m_renderer->devicePixelRatio() != dpr) {
m_renderer->setDevicePixelRatio(dpr);
discardQuads();
}
}
void DecorationItem::handleFrameGeometryChanged()
{
setSize(m_window->size());
}
void DecorationItem::handleWindowClosed(Toplevel *original, Deleted *deleted)
{
Q_UNUSED(original)
m_window = deleted;
// If the decoration is about to be destroyed, render the decoration for the last time.
preprocess();
}
DecorationRenderer *DecorationItem::renderer() const
{
return m_renderer.data();
}
WindowQuad buildQuad(const QRect &partRect, const QPoint &textureOffset,
const qreal devicePixelRatio, bool rotated)
{
const QRect &r = partRect;
const int p = DecorationRenderer::TexturePad;
const int x0 = r.x();
const int y0 = r.y();
const int x1 = r.x() + r.width();
const int y1 = r.y() + r.height();
int u0 = textureOffset.x() + p;
int v0 = textureOffset.y() + p;
int u1 = textureOffset.x() + p + (r.width() * devicePixelRatio);
int v1 = textureOffset.y() + p + (r.height() * devicePixelRatio);
if (rotated) {
u0 = textureOffset.x() + p;
v0 = textureOffset.y() + p + (r.width() * devicePixelRatio);
u1 = textureOffset.x() + p + (r.height() * devicePixelRatio);
v1 = textureOffset.y() + p;
}
WindowQuad quad;
quad[0] = WindowVertex(x0, y0, u0, v0); // Top-left
quad[1] = WindowVertex(x1, y0, u1, v0); // Top-right
quad[2] = WindowVertex(x1, y1, u1, v1); // Bottom-right
quad[3] = WindowVertex(x0, y1, u0, v1); // Bottom-left
return quad;
}
WindowQuadList DecorationItem::buildQuads() const
{
if (m_window->frameMargins().isNull()) {
return WindowQuadList();
}
QRect left, top, right, bottom;
const qreal devicePixelRatio = m_renderer->effectiveDevicePixelRatio();
const int texturePad = DecorationRenderer::TexturePad;
if (const AbstractClient *client = qobject_cast<const AbstractClient *>(m_window)) {
client->layoutDecorationRects(left, top, right, bottom);
} else if (const Deleted *deleted = qobject_cast<const Deleted *>(m_window)) {
deleted->layoutDecorationRects(left, top, right, bottom);
}
const int topHeight = std::ceil(top.height() * devicePixelRatio);
const int bottomHeight = std::ceil(bottom.height() * devicePixelRatio);
const int leftWidth = std::ceil(left.width() * devicePixelRatio);
const QPoint topPosition(0, 0);
const QPoint bottomPosition(0, topPosition.y() + topHeight + (2 * texturePad));
const QPoint leftPosition(0, bottomPosition.y() + bottomHeight + (2 * texturePad));
const QPoint rightPosition(0, leftPosition.y() + leftWidth + (2 * texturePad));
WindowQuadList list;
if (left.isValid()) {
list.append(buildQuad(left, leftPosition, devicePixelRatio, true));
}
if (top.isValid()) {
list.append(buildQuad(top, topPosition, devicePixelRatio, false));
}
if (right.isValid()) {
list.append(buildQuad(right, rightPosition, devicePixelRatio, true));
}
if (bottom.isValid()) {
list.append(buildQuad(bottom, bottomPosition, devicePixelRatio, false));
}
return list;
}
} // namespace KWin