kwin/src/shadowitem.cpp

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/*
SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "shadowitem.h"
#include "deleted.h"
#include "shadow.h"
namespace KWin
{
ShadowItem::ShadowItem(Shadow *shadow, Toplevel *window, Item *parent)
: Item(parent)
, m_window(window)
, m_shadow(shadow)
{
connect(window, &Toplevel::windowClosed, this, &ShadowItem::handleWindowClosed);
connect(shadow, &Shadow::offsetChanged, this, &ShadowItem::updateGeometry);
connect(shadow, &Shadow::rectChanged, this, &ShadowItem::updateGeometry);
connect(shadow, &Shadow::textureChanged, this, &ShadowItem::handleTextureChanged);
updateGeometry();
handleTextureChanged();
}
ShadowItem::~ShadowItem()
{
}
Shadow *ShadowItem::shadow() const
{
return m_shadow.data();
}
void ShadowItem::updateGeometry()
{
const QRect rect = m_shadow->rect() + m_shadow->offset();
setPosition(rect.topLeft());
setSize(rect.size());
discardQuads();
}
void ShadowItem::handleTextureChanged()
{
scheduleRepaint(rect());
discardQuads();
}
void ShadowItem::handleWindowClosed(Toplevel *original, Deleted *deleted)
{
Q_UNUSED(original)
m_window = deleted;
}
static inline void distributeHorizontally(QRectF &leftRect, QRectF &rightRect)
{
if (leftRect.right() > rightRect.left()) {
const qreal boundedRight = std::min(leftRect.right(), rightRect.right());
const qreal boundedLeft = std::max(leftRect.left(), rightRect.left());
const qreal halfOverlap = (boundedRight - boundedLeft) / 2.0;
leftRect.setRight(boundedRight - halfOverlap);
rightRect.setLeft(boundedLeft + halfOverlap);
}
}
static inline void distributeVertically(QRectF &topRect, QRectF &bottomRect)
{
if (topRect.bottom() > bottomRect.top()) {
const qreal boundedBottom = std::min(topRect.bottom(), bottomRect.bottom());
const qreal boundedTop = std::max(topRect.top(), bottomRect.top());
const qreal halfOverlap = (boundedBottom - boundedTop) / 2.0;
topRect.setBottom(boundedBottom - halfOverlap);
bottomRect.setTop(boundedTop + halfOverlap);
}
}
WindowQuadList ShadowItem::buildQuads() const
{
// Do not draw shadows if window width or window height is less than 5 px. 5 is an arbitrary choice.
if (!m_window->wantsShadowToBeRendered() || m_window->width() < 5 || m_window->height() < 5) {
return WindowQuadList();
}
const QSizeF top(m_shadow->elementSize(Shadow::ShadowElementTop));
const QSizeF topRight(m_shadow->elementSize(Shadow::ShadowElementTopRight));
const QSizeF right(m_shadow->elementSize(Shadow::ShadowElementRight));
const QSizeF bottomRight(m_shadow->elementSize(Shadow::ShadowElementBottomRight));
const QSizeF bottom(m_shadow->elementSize(Shadow::ShadowElementBottom));
const QSizeF bottomLeft(m_shadow->elementSize(Shadow::ShadowElementBottomLeft));
const QSizeF left(m_shadow->elementSize(Shadow::ShadowElementLeft));
const QSizeF topLeft(m_shadow->elementSize(Shadow::ShadowElementTopLeft));
const QMarginsF shadowMargins(
std::max({topLeft.width(), left.width(), bottomLeft.width()}),
std::max({topLeft.height(), top.height(), topRight.height()}),
std::max({topRight.width(), right.width(), bottomRight.width()}),
std::max({bottomRight.height(), bottom.height(), bottomLeft.height()}));
const QRectF outerRect = rect();
const int width = shadowMargins.left() + std::max(top.width(), bottom.width()) + shadowMargins.right();
const int height = shadowMargins.top() + std::max(left.height(), right.height()) + shadowMargins.bottom();
QRectF topLeftRect;
if (!topLeft.isEmpty()) {
topLeftRect = QRectF(outerRect.topLeft(), topLeft);
} else {
topLeftRect = QRectF(outerRect.left() + shadowMargins.left(),
outerRect.top() + shadowMargins.top(), 0, 0);
}
QRectF topRightRect;
if (!topRight.isEmpty()) {
topRightRect = QRectF(outerRect.right() - topRight.width(), outerRect.top(),
topRight.width(), topRight.height());
} else {
topRightRect = QRectF(outerRect.right() - shadowMargins.right(),
outerRect.top() + shadowMargins.top(), 0, 0);
}
QRectF bottomRightRect;
if (!bottomRight.isEmpty()) {
bottomRightRect = QRectF(outerRect.right() - bottomRight.width(),
outerRect.bottom() - bottomRight.height(),
bottomRight.width(), bottomRight.height());
} else {
bottomRightRect = QRectF(outerRect.right() - shadowMargins.right(),
outerRect.bottom() - shadowMargins.bottom(), 0, 0);
}
QRectF bottomLeftRect;
if (!bottomLeft.isEmpty()) {
bottomLeftRect = QRectF(outerRect.left(), outerRect.bottom() - bottomLeft.height(),
bottomLeft.width(), bottomLeft.height());
} else {
bottomLeftRect = QRectF(outerRect.left() + shadowMargins.left(),
outerRect.bottom() - shadowMargins.bottom(), 0, 0);
}
// Re-distribute the corner tiles so no one of them is overlapping with others.
// By doing this, we assume that shadow's corner tiles are symmetric
// and it is OK to not draw top/right/bottom/left tile between corners.
// For example, let's say top-left and top-right tiles are overlapping.
// In that case, the right side of the top-left tile will be shifted to left,
// the left side of the top-right tile will shifted to right, and the top
// tile won't be rendered.
distributeHorizontally(topLeftRect, topRightRect);
distributeHorizontally(bottomLeftRect, bottomRightRect);
distributeVertically(topLeftRect, bottomLeftRect);
distributeVertically(topRightRect, bottomRightRect);
qreal tx1 = 0.0,
tx2 = 0.0,
ty1 = 0.0,
ty2 = 0.0;
WindowQuadList quads;
quads.reserve(8);
if (topLeftRect.isValid()) {
tx1 = 0.0;
ty1 = 0.0;
tx2 = topLeftRect.width();
ty2 = topLeftRect.height();
WindowQuad topLeftQuad;
topLeftQuad[0] = WindowVertex(topLeftRect.left(), topLeftRect.top(), tx1, ty1);
topLeftQuad[1] = WindowVertex(topLeftRect.right(), topLeftRect.top(), tx2, ty1);
topLeftQuad[2] = WindowVertex(topLeftRect.right(), topLeftRect.bottom(), tx2, ty2);
topLeftQuad[3] = WindowVertex(topLeftRect.left(), topLeftRect.bottom(), tx1, ty2);
quads.append(topLeftQuad);
}
if (topRightRect.isValid()) {
tx1 = width - topRightRect.width();
ty1 = 0.0;
tx2 = width;
ty2 = topRightRect.height();
WindowQuad topRightQuad;
topRightQuad[0] = WindowVertex(topRightRect.left(), topRightRect.top(), tx1, ty1);
topRightQuad[1] = WindowVertex(topRightRect.right(), topRightRect.top(), tx2, ty1);
topRightQuad[2] = WindowVertex(topRightRect.right(), topRightRect.bottom(), tx2, ty2);
topRightQuad[3] = WindowVertex(topRightRect.left(), topRightRect.bottom(), tx1, ty2);
quads.append(topRightQuad);
}
if (bottomRightRect.isValid()) {
tx1 = width - bottomRightRect.width();
tx2 = width;
ty1 = height - bottomRightRect.height();
ty2 = height;
WindowQuad bottomRightQuad;
bottomRightQuad[0] = WindowVertex(bottomRightRect.left(), bottomRightRect.top(), tx1, ty1);
bottomRightQuad[1] = WindowVertex(bottomRightRect.right(), bottomRightRect.top(), tx2, ty1);
bottomRightQuad[2] = WindowVertex(bottomRightRect.right(), bottomRightRect.bottom(), tx2, ty2);
bottomRightQuad[3] = WindowVertex(bottomRightRect.left(), bottomRightRect.bottom(), tx1, ty2);
quads.append(bottomRightQuad);
}
if (bottomLeftRect.isValid()) {
tx1 = 0.0;
tx2 = bottomLeftRect.width();
ty1 = height - bottomLeftRect.height();
ty2 = height;
WindowQuad bottomLeftQuad;
bottomLeftQuad[0] = WindowVertex(bottomLeftRect.left(), bottomLeftRect.top(), tx1, ty1);
bottomLeftQuad[1] = WindowVertex(bottomLeftRect.right(), bottomLeftRect.top(), tx2, ty1);
bottomLeftQuad[2] = WindowVertex(bottomLeftRect.right(), bottomLeftRect.bottom(), tx2, ty2);
bottomLeftQuad[3] = WindowVertex(bottomLeftRect.left(), bottomLeftRect.bottom(), tx1, ty2);
quads.append(bottomLeftQuad);
}
QRectF topRect(QPointF(topLeftRect.right(), outerRect.top()),
QPointF(topRightRect.left(), outerRect.top() + top.height()));
QRectF rightRect(QPointF(outerRect.right() - right.width(), topRightRect.bottom()),
QPointF(outerRect.right(), bottomRightRect.top()));
QRectF bottomRect(QPointF(bottomLeftRect.right(), outerRect.bottom() - bottom.height()),
QPointF(bottomRightRect.left(), outerRect.bottom()));
QRectF leftRect(QPointF(outerRect.left(), topLeftRect.bottom()),
QPointF(outerRect.left() + left.width(), bottomLeftRect.top()));
// Re-distribute left/right and top/bottom shadow tiles so they don't
// overlap when the window is too small. Please notice that we don't
// fix overlaps between left/top(left/bottom, right/top, and so on)
// corner tiles because corresponding counter parts won't be valid when
// the window is too small, which means they won't be rendered.
distributeHorizontally(leftRect, rightRect);
distributeVertically(topRect, bottomRect);
if (topRect.isValid()) {
tx1 = shadowMargins.left();
ty1 = 0.0;
tx2 = tx1 + top.width();
ty2 = topRect.height();
WindowQuad topQuad;
topQuad[0] = WindowVertex(topRect.left(), topRect.top(), tx1, ty1);
topQuad[1] = WindowVertex(topRect.right(), topRect.top(), tx2, ty1);
topQuad[2] = WindowVertex(topRect.right(), topRect.bottom(), tx2, ty2);
topQuad[3] = WindowVertex(topRect.left(), topRect.bottom(), tx1, ty2);
quads.append(topQuad);
}
if (rightRect.isValid()) {
tx1 = width - rightRect.width();
ty1 = shadowMargins.top();
tx2 = width;
ty2 = ty1 + right.height();
WindowQuad rightQuad;
rightQuad[0] = WindowVertex(rightRect.left(), rightRect.top(), tx1, ty1);
rightQuad[1] = WindowVertex(rightRect.right(), rightRect.top(), tx2, ty1);
rightQuad[2] = WindowVertex(rightRect.right(), rightRect.bottom(), tx2, ty2);
rightQuad[3] = WindowVertex(rightRect.left(), rightRect.bottom(), tx1, ty2);
quads.append(rightQuad);
}
if (bottomRect.isValid()) {
tx1 = shadowMargins.left();
ty1 = height - bottomRect.height();
tx2 = tx1 + bottom.width();
ty2 = height;
WindowQuad bottomQuad;
bottomQuad[0] = WindowVertex(bottomRect.left(), bottomRect.top(), tx1, ty1);
bottomQuad[1] = WindowVertex(bottomRect.right(), bottomRect.top(), tx2, ty1);
bottomQuad[2] = WindowVertex(bottomRect.right(), bottomRect.bottom(), tx2, ty2);
bottomQuad[3] = WindowVertex(bottomRect.left(), bottomRect.bottom(), tx1, ty2);
quads.append(bottomQuad);
}
if (leftRect.isValid()) {
tx1 = 0.0;
ty1 = shadowMargins.top();
tx2 = leftRect.width();
ty2 = ty1 + left.height();
WindowQuad leftQuad;
leftQuad[0] = WindowVertex(leftRect.left(), leftRect.top(), tx1, ty1);
leftQuad[1] = WindowVertex(leftRect.right(), leftRect.top(), tx2, ty1);
leftQuad[2] = WindowVertex(leftRect.right(), leftRect.bottom(), tx2, ty2);
leftQuad[3] = WindowVertex(leftRect.left(), leftRect.bottom(), tx1, ty2);
quads.append(leftQuad);
}
return quads;
}
} // namespace KWin