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kwin/effects/showfps/showfps.cpp
Vlad Zahorodnii 9f2cb0ae1b Provide expected presentation time to effects 
Effects are given the interval between two consecutive frames. The main
flaw of this approach is that if the Compositor transitions from the idle
state to "active" state, i.e. when there is something to repaint,
effects may see a very large interval between the last painted frame and
the current. In order to address this issue, the Scene invalidates the
timer that is used to measure time between consecutive frames before the
Compositor is about to become idle.

While this works perfectly fine with Xinerama-style rendering, with per
screen rendering, determining whether the compositor is about to idle is
rather a tedious task mostly because a single output can't be used for
the test.

Furthermore, since the Compositor schedules pointless repaints just to
ensure that it's idle, it might take several attempts to figure out
whether the scene timer must be invalidated if you use (true) per screen
rendering.

Ideally, all effects should use a timeline helper that is aware of the
underlying render loop and its timings. However, this option is off the
table because it will involve a lot of work to implement it.

Alternative and much simpler option is to pass the expected presentation
time to effects rather than time between consecutive frames. This means
that effects are responsible for determining how much animation timelines
have to be advanced. Typically, an effect would have to store the
presentation timestamp provided in either prePaint{Screen,Window} and
use it in the subsequent prePaint{Screen,Window} call to estimate the
amount of time passed between the next and the last frames.

Unfortunately, this is an API incompatible change. However, it shouldn't
take a lot of work to port third-party binary effects, which don't use the
AnimationEffect class, to the new API. On the bright side, we no longer
need to be concerned about the Compositor getting idle.

We do still try to determine whether the Compositor is about to idle,
primarily, because the OpenGL render backend swaps buffers on present,
but that will change with the ongoing compositing timing rework.
2020-12-10 07:14:42 +00:00

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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2006 Lubos Lunak <l.lunak@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "showfps.h"
// KConfigSkeleton
#include "showfpsconfig.h"
#include <kwinconfig.h>
#include <kwinglutils.h>
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
#include <kwinxrenderutils.h>
#include <xcb/render.h>
#endif
#include <KLocalizedString>
#include <QPainter>
#include <QVector2D>
#include <QPalette>
#include <cmath>
namespace KWin
{
const int FPS_WIDTH = 10;
const int MAX_TIME = 100;
ShowFpsEffect::ShowFpsEffect()
: paints_pos(0)
, frames_pos(0)
, m_noBenchmark(effects->effectFrame(EffectFrameUnstyled, false))
{
initConfig<ShowFpsConfig>();
for (int i = 0;
i < NUM_PAINTS;
++i) {
paints[ i ] = 0;
paint_size[ i ] = 0;
}
for (int i = 0;
i < MAX_FPS;
++i)
frames[ i ] = 0;
m_noBenchmark->setAlignment(Qt::AlignTop | Qt::AlignRight);
m_noBenchmark->setText(i18n("This effect is not a benchmark"));
reconfigure(ReconfigureAll);
}
void ShowFpsEffect::reconfigure(ReconfigureFlags)
{
ShowFpsConfig::self()->read();
alpha = ShowFpsConfig::alpha();
x = ShowFpsConfig::x();
y = ShowFpsConfig::y();
const QSize screenSize = effects->virtualScreenSize();
if (x == -10000) // there's no -0 :(
x = screenSize.width() - 2 * NUM_PAINTS - FPS_WIDTH;
else if (x < 0)
x = screenSize.width() - 2 * NUM_PAINTS - FPS_WIDTH - x;
if (y == -10000)
y = screenSize.height() - MAX_TIME;
else if (y < 0)
y = screenSize.height() - MAX_TIME - y;
fps_rect = QRect(x, y, FPS_WIDTH + 2 * NUM_PAINTS, MAX_TIME);
m_noBenchmark->setPosition(fps_rect.bottomRight() + QPoint(-6, 6));
int textPosition = ShowFpsConfig::textPosition();
textFont = ShowFpsConfig::textFont();
textColor = ShowFpsConfig::textColor();
double textAlpha = ShowFpsConfig::textAlpha();
if (!textColor.isValid())
textColor = QPalette().color(QPalette::Active, QPalette::WindowText);
textColor.setAlphaF(textAlpha);
switch(textPosition) {
case TOP_LEFT:
fpsTextRect = QRect(0, 0, 100, 100);
textAlign = Qt::AlignTop | Qt::AlignLeft;
break;
case TOP_RIGHT:
fpsTextRect = QRect(screenSize.width() - 100, 0, 100, 100);
textAlign = Qt::AlignTop | Qt::AlignRight;
break;
case BOTTOM_LEFT:
fpsTextRect = QRect(0, screenSize.height() - 100, 100, 100);
textAlign = Qt::AlignBottom | Qt::AlignLeft;
break;
case BOTTOM_RIGHT:
fpsTextRect = QRect(screenSize.width() - 100, screenSize.height() - 100, 100, 100);
textAlign = Qt::AlignBottom | Qt::AlignRight;
break;
case NOWHERE:
fpsTextRect = QRect();
break;
case INSIDE_GRAPH:
default:
fpsTextRect = QRect(x, y, FPS_WIDTH + NUM_PAINTS, MAX_TIME);
textAlign = Qt::AlignTop | Qt::AlignRight;
break;
}
}
void ShowFpsEffect::prePaintScreen(ScreenPrePaintData& data, std::chrono::milliseconds presentTime)
{
frames[ frames_pos ] = QDateTime::currentMSecsSinceEpoch();
if (++frames_pos == MAX_FPS)
frames_pos = 0;
effects->prePaintScreen(data, presentTime);
data.paint += fps_rect;
paint_size[ paints_pos ] = 0;
t.restart();
}
void ShowFpsEffect::paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data)
{
effects->paintWindow(w, mask, region, data);
// Take intersection of region and actual window's rect, minus the fps area
// (since we keep repainting it) and count the pixels.
QRegion r2 = region & QRect(w->x(), w->y(), w->width(), w->height());
r2 -= fps_rect;
int winsize = 0;
for (const QRect &r : r2) {
winsize += r.width() * r.height();
}
paint_size[ paints_pos ] += winsize;
}
void ShowFpsEffect::paintScreen(int mask, const QRegion &region, ScreenPaintData& data)
{
effects->paintScreen(mask, region, data);
int lastFrame = frames_pos - 1;
if (lastFrame < 0)
lastFrame = MAX_FPS - 1;
const qint64 lastTimestamp = frames[lastFrame];
int fps = 0;
for (int i = 0;
i < MAX_FPS;
++i)
if (abs(lastTimestamp - frames[ i ]) < 1000)
++fps; // count all frames in the last second
if (fps > MAX_TIME)
fps = MAX_TIME; // keep it the same height
if (effects->isOpenGLCompositing()) {
paintGL(fps, data.projectionMatrix());
glFinish(); // make sure all rendering is done
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (effects->compositingType() == XRenderCompositing) {
paintXrender(fps);
xcb_flush(xcbConnection()); // make sure all rendering is done
}
#endif
if (effects->compositingType() == QPainterCompositing) {
paintQPainter(fps);
}
m_noBenchmark->render(infiniteRegion(), 1.0, alpha);
}
void ShowFpsEffect::paintGL(int fps, const QMatrix4x4 &projectionMatrix)
{
int x = this->x;
int y = this->y;
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// TODO painting first the background white and then the contents
// means that the contents also blend with the background, I guess
ShaderBinder binder(ShaderTrait::UniformColor);
binder.shader()->setUniform(GLShader::ModelViewProjectionMatrix, projectionMatrix);
GLVertexBuffer *vbo = GLVertexBuffer::streamingBuffer();
vbo->reset();
QColor color(255, 255, 255);
color.setAlphaF(alpha);
vbo->setColor(color);
QVector<float> verts;
verts.reserve(12);
verts << x + 2 * NUM_PAINTS + FPS_WIDTH << y;
verts << x << y;
verts << x << y + MAX_TIME;
verts << x << y + MAX_TIME;
verts << x + 2 * NUM_PAINTS + FPS_WIDTH << y + MAX_TIME;
verts << x + 2 * NUM_PAINTS + FPS_WIDTH << y;
vbo->setData(6, 2, verts.constData(), nullptr);
vbo->render(GL_TRIANGLES);
y += MAX_TIME; // paint up from the bottom
color.setRed(0);
color.setGreen(0);
vbo->setColor(color);
verts.clear();
verts << x + FPS_WIDTH << y - fps;
verts << x << y - fps;
verts << x << y;
verts << x << y;
verts << x + FPS_WIDTH << y;
verts << x + FPS_WIDTH << y - fps;
vbo->setData(6, 2, verts.constData(), nullptr);
vbo->render(GL_TRIANGLES);
color.setBlue(0);
vbo->setColor(color);
QVector<float> vertices;
for (int i = 10;
i < MAX_TIME;
i += 10) {
vertices << x << y - i;
vertices << x + FPS_WIDTH << y - i;
}
vbo->setData(vertices.size() / 2, 2, vertices.constData(), nullptr);
vbo->render(GL_LINES);
x += FPS_WIDTH;
// Paint FPS graph
paintFPSGraph(x, y);
x += NUM_PAINTS;
// Paint amount of rendered pixels graph
paintDrawSizeGraph(x, y);
// Paint FPS numerical value
if (fpsTextRect.isValid()) {
fpsText.reset(new GLTexture(fpsTextImage(fps)));
fpsText->bind();
ShaderBinder binder(ShaderTrait::MapTexture);
QMatrix4x4 mvp = projectionMatrix;
mvp.translate(fpsTextRect.x(), fpsTextRect.y());
binder.shader()->setUniform(GLShader::ModelViewProjectionMatrix, mvp);
fpsText->render(QRegion(fpsTextRect), fpsTextRect);
fpsText->unbind();
effects->addRepaint(fpsTextRect);
}
// Paint paint sizes
glDisable(GL_BLEND);
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
/*
Differences between OpenGL and XRender:
- differently specified rectangles (X: width/height, O: x2,y2)
- XRender uses pre-multiplied alpha
*/
void ShowFpsEffect::paintXrender(int fps)
{
xcb_pixmap_t pixmap = xcb_generate_id(xcbConnection());
xcb_create_pixmap(xcbConnection(), 32, pixmap, x11RootWindow(), FPS_WIDTH, MAX_TIME);
XRenderPicture p(pixmap, 32);
xcb_free_pixmap(xcbConnection(), pixmap);
xcb_render_color_t col;
col.alpha = int(alpha * 0xffff);
col.red = int(alpha * 0xffff); // white
col.green = int(alpha * 0xffff);
col.blue = int(alpha * 0xffff);
xcb_rectangle_t rect = {0, 0, FPS_WIDTH, MAX_TIME};
xcb_render_fill_rectangles(xcbConnection(), XCB_RENDER_PICT_OP_SRC, p, col, 1, &rect);
col.red = 0; // blue
col.green = 0;
col.blue = int(alpha * 0xffff);
rect.y = MAX_TIME - fps;
rect.width = FPS_WIDTH;
rect.height = fps;
xcb_render_fill_rectangles(xcbConnection(), XCB_RENDER_PICT_OP_SRC, p, col, 1, &rect);
col.red = 0; // black
col.green = 0;
col.blue = 0;
QVector<xcb_rectangle_t> rects;
for (int i = 10;
i < MAX_TIME;
i += 10) {
xcb_rectangle_t rect = {0, int16_t(MAX_TIME - i), uint16_t(FPS_WIDTH), 1};
rects << rect;
}
xcb_render_fill_rectangles(xcbConnection(), XCB_RENDER_PICT_OP_SRC, p, col, rects.count(), rects.constData());
xcb_render_composite(xcbConnection(), alpha != 1.0 ? XCB_RENDER_PICT_OP_OVER : XCB_RENDER_PICT_OP_SRC, p, XCB_RENDER_PICTURE_NONE,
effects->xrenderBufferPicture(), 0, 0, 0, 0, x, y, FPS_WIDTH, MAX_TIME);
// Paint FPS graph
paintFPSGraph(x + FPS_WIDTH, y);
// Paint amount of rendered pixels graph
paintDrawSizeGraph(x + FPS_WIDTH + MAX_TIME, y);
// Paint FPS numerical value
if (fpsTextRect.isValid()) {
QImage textImg(fpsTextImage(fps));
XRenderPicture textPic(textImg);
xcb_render_composite(xcbConnection(), XCB_RENDER_PICT_OP_OVER, textPic, XCB_RENDER_PICTURE_NONE,
effects->xrenderBufferPicture(), 0, 0, 0, 0, fpsTextRect.x(), fpsTextRect.y(), textImg.width(), textImg.height());
effects->addRepaint(fpsTextRect);
}
}
#endif
void ShowFpsEffect::paintQPainter(int fps)
{
QPainter *painter = effects->scenePainter();
painter->save();
QColor color(255, 255, 255);
color.setAlphaF(alpha);
painter->setCompositionMode(QPainter::CompositionMode_SourceOver);
painter->fillRect(x, y, 2 * NUM_PAINTS + FPS_WIDTH, MAX_TIME, color);
color.setRed(0);
color.setGreen(0);
painter->fillRect(x, y + MAX_TIME - fps, FPS_WIDTH, fps, color);
color.setBlue(0);
for (int i = 10; i < MAX_TIME; i += 10) {
painter->setPen(color);
painter->drawLine(x, y + MAX_TIME - i, x + FPS_WIDTH, y + MAX_TIME - i);
}
// Paint FPS graph
paintFPSGraph(x + FPS_WIDTH, y + MAX_TIME - 1);
// Paint amount of rendered pixels graph
paintDrawSizeGraph(x + FPS_WIDTH + NUM_PAINTS, y + MAX_TIME - 1);
// Paint FPS numerical value
painter->setPen(Qt::black);
painter->drawText(fpsTextRect, textAlign, QString::number(fps));
painter->restore();
}
void ShowFpsEffect::paintFPSGraph(int x, int y)
{
// Paint FPS graph
QList<int> lines;
lines << 10 << 20 << 50;
QList<int> values;
for (int i = 0;
i < NUM_PAINTS;
++i) {
values.append(paints[(i + paints_pos) % NUM_PAINTS ]);
}
paintGraph(x, y, values, lines, true);
}
void ShowFpsEffect::paintDrawSizeGraph(int x, int y)
{
int max_drawsize = 0;
for (int i = 0; i < NUM_PAINTS; i++)
max_drawsize = qMax(max_drawsize, paint_size[ i ]);
// Log of min/max values shown on graph
const float max_pixels_log = 7.2f;
const float min_pixels_log = 2.0f;
const int minh = 5; // Minimum height of the bar when value > 0
float drawscale = (MAX_TIME - minh) / (max_pixels_log - min_pixels_log);
QList<int> drawlines;
for (int logh = (int)min_pixels_log; logh <= max_pixels_log; logh++)
drawlines.append((int)((logh - min_pixels_log) * drawscale) + minh);
QList<int> drawvalues;
for (int i = 0;
i < NUM_PAINTS;
++i) {
int value = paint_size[(i + paints_pos) % NUM_PAINTS ];
int h = 0;
if (value > 0) {
h = (int)((log10((double)value) - min_pixels_log) * drawscale);
h = qMin(qMax(0, h) + minh, MAX_TIME);
}
drawvalues.append(h);
}
paintGraph(x, y, drawvalues, drawlines, false);
}
void ShowFpsEffect::paintGraph(int x, int y, QList<int> values, QList<int> lines, bool colorize)
{
if (effects->isOpenGLCompositing()) {
QColor color(0, 0, 0);
color.setAlphaF(alpha);
GLVertexBuffer *vbo = GLVertexBuffer::streamingBuffer();
vbo->reset();
vbo->setColor(color);
QVector<float> verts;
// First draw the lines
foreach (int h, lines) {
verts << x << y - h;
verts << x + values.count() << y - h;
}
vbo->setData(verts.size() / 2, 2, verts.constData(), nullptr);
vbo->render(GL_LINES);
// Then the graph values
int lastValue = 0;
verts.clear();
for (int i = 0; i < values.count(); i++) {
int value = values[ i ];
if (colorize && value != lastValue) {
if (!verts.isEmpty()) {
vbo->setData(verts.size() / 2, 2, verts.constData(), nullptr);
vbo->render(GL_LINES);
}
verts.clear();
if (value <= 10) {
color = QColor(0, 255, 0);
} else if (value <= 20) {
color = QColor(255, 255, 0);
} else if (value <= 50) {
color = QColor(255, 0, 0);
} else {
color = QColor(0, 0, 0);
}
vbo->setColor(color);
}
verts << x + values.count() - i << y;
verts << x + values.count() - i << y - value;
lastValue = value;
}
if (!verts.isEmpty()) {
vbo->setData(verts.size() / 2, 2, verts.constData(), nullptr);
vbo->render(GL_LINES);
}
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (effects->compositingType() == XRenderCompositing) {
xcb_pixmap_t pixmap = xcb_generate_id(xcbConnection());
xcb_create_pixmap(xcbConnection(), 32, pixmap, x11RootWindow(), values.count(), MAX_TIME);
XRenderPicture p(pixmap, 32);
xcb_free_pixmap(xcbConnection(), pixmap);
xcb_render_color_t col;
col.alpha = int(alpha * 0xffff);
// Draw background
col.red = col.green = col.blue = int(alpha * 0xffff); // white
xcb_rectangle_t rect = {0, 0, uint16_t(values.count()), uint16_t(MAX_TIME)};
xcb_render_fill_rectangles(xcbConnection(), XCB_RENDER_PICT_OP_SRC, p, col, 1, &rect);
// Then the values
col.red = col.green = col.blue = int(alpha * 0x8000); // grey
for (int i = 0; i < values.count(); i++) {
int value = values[ i ];
if (colorize) {
if (value <= 10) {
// green
col.red = 0;
col.green = int(alpha * 0xffff);
col.blue = 0;
} else if (value <= 20) {
// yellow
col.red = int(alpha * 0xffff);
col.green = int(alpha * 0xffff);
col.blue = 0;
} else if (value <= 50) {
// red
col.red = int(alpha * 0xffff);
col.green = 0;
col.blue = 0;
} else {
// black
col.red = 0;
col.green = 0;
col.blue = 0;
}
}
xcb_rectangle_t rect = {int16_t(values.count() - i), int16_t(MAX_TIME - value), 1, uint16_t(value)};
xcb_render_fill_rectangles(xcbConnection(), XCB_RENDER_PICT_OP_SRC, p, col, 1, &rect);
}
// Then the lines
col.red = col.green = col.blue = 0; // black
QVector<xcb_rectangle_t> rects;
foreach (int h, lines) {
xcb_rectangle_t rect = {0, int16_t(MAX_TIME - h), uint16_t(values.count()), 1};
rects << rect;
}
xcb_render_fill_rectangles(xcbConnection(), XCB_RENDER_PICT_OP_SRC, p, col, rects.count(), rects.constData());
// Finally render the pixmap onto screen
xcb_render_composite(xcbConnection(), alpha != 1.0 ? XCB_RENDER_PICT_OP_OVER : XCB_RENDER_PICT_OP_SRC, p,
XCB_RENDER_PICTURE_NONE, effects->xrenderBufferPicture(), 0, 0, 0, 0, x, y, values.count(), MAX_TIME);
}
#endif
if (effects->compositingType() == QPainterCompositing) {
QPainter *painter = effects->scenePainter();
painter->setPen(Qt::black);
// First draw the lines
foreach (int h, lines) {
painter->drawLine(x, y - h, x + values.count(), y - h);
}
QColor color(0, 0, 0);
color.setAlphaF(alpha);
for (int i = 0; i < values.count(); i++) {
int value = values[ i ];
if (colorize) {
if (value <= 10) {
color = QColor(0, 255, 0);
} else if (value <= 20) {
color = QColor(255, 255, 0);
} else if (value <= 50) {
color = QColor(255, 0, 0);
} else {
color = QColor(0, 0, 0);
}
}
painter->setPen(color);
painter->drawLine(x + values.count() - i, y, x + values.count() - i, y - value);
}
}
}
void ShowFpsEffect::postPaintScreen()
{
effects->postPaintScreen();
paints[ paints_pos ] = t.elapsed();
if (++paints_pos == NUM_PAINTS)
paints_pos = 0;
effects->addRepaint(fps_rect);
}
QImage ShowFpsEffect::fpsTextImage(int fps)
{
QImage im(100, 100, QImage::Format_ARGB32);
im.fill(Qt::transparent);
QPainter painter(&im);
painter.setFont(textFont);
painter.setPen(textColor);
painter.drawText(QRect(0, 0, 100, 100), textAlign, QString::number(fps));
painter.end();
return im;
}
} // namespace
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