/
Window.C
1061 lines (861 loc) · 24 KB
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Window.C
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/*
This file is part of memview, a real-time memory trace visualization
application.
Copyright (C) 2013 Andrew Clinton
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "Window.h"
#include "Color.h"
#include "MemoryState.h"
#include "Loader.h"
#include <fstream>
#include <sys/ptrace.h>
#include <sys/wait.h>
#define USE_PBUFFER
static const QSize theDefaultSize(800, 600);
Window::Window(int argc, char *argv[])
{
myScrollArea = new MemViewScroll(this);
setStatusBar(statusBar());
myMemView = new MemViewWidget(argc, argv,
myScrollArea,
myScrollArea->verticalScrollBar(),
myScrollArea->horizontalScrollBar(),
statusBar());
myQuit = new QAction(tr("&Quit"), this);
connect(myQuit, SIGNAL(triggered()), qApp, SLOT(quit()));
myFileMenu = menuBar()->addMenu(tr("&File"));
myFileMenu->addSeparator();
myFileMenu->addAction(myQuit);
myLayoutMenu = menuBar()->addMenu(tr("&Layout"));
static const char *theVisNames[theVisCount] = {
"&Hilbert Curve",
"&Recursive Block",
"&Linear",
};
myVisGroup = createActionGroup(
myLayoutMenu, theVisNames, myVis, theVisCount, 0);
myLayoutMenu->addSeparator();
static const char *theLayoutNames[theLayoutCount] = {
"&Compact",
"&Full Size",
};
myLayoutGroup = createActionGroup(
myLayoutMenu, theLayoutNames, myLayout, theLayoutCount, 0);
connect(myVis[0], SIGNAL(triggered()), myMemView, SLOT(hilbert()));
connect(myVis[1], SIGNAL(triggered()), myMemView, SLOT(block()));
connect(myVis[2], SIGNAL(triggered()), myMemView, SLOT(linear()));
connect(myLayout[0], SIGNAL(triggered()), myMemView, SLOT(compact()));
connect(myLayout[1], SIGNAL(triggered()), myMemView, SLOT(full()));
static const char *theDisplayNames[theDisplayCount] = {
"&Read/Write",
"&Thread Id",
"&Data Type",
};
myDisplayMenu = menuBar()->addMenu(tr("&Display"));
myDisplayGroup = createActionGroup(
myDisplayMenu, theDisplayNames, myDisplay, theDisplayCount, 0);
myDisplayMenu->addSeparator();
myDisplayStack = new QAction(tr("&Inspect Stacks"), this);
myDisplayStack->setCheckable(true);
myDisplayMenu->addAction(myDisplayStack);
connect(myDisplayGroup, SIGNAL(triggered(QAction *)),
myMemView, SLOT(display(QAction *)));
connect(myDisplayStack, SIGNAL(triggered()),
myMemView, SLOT(stackdisplay()));
// This menu should be ordered the same as the MV_Data* defines in
// mv_ipc.h
static const char *theDataTypeNames[theDataTypeCount] = {
"&Auto-Detect Types",
"&32-bit Integer",
"&64-bit Integer",
"&32-bit Float",
"&64-bit Float",
};
myDataTypeMenu = menuBar()->addMenu(tr("&Data Type"));
myDataTypeGroup = createActionGroup(
myDataTypeMenu, theDataTypeNames, myDataType, theDataTypeCount, 0);
connect(myDataTypeGroup, SIGNAL(triggered(QAction *)),
myMemView, SLOT(datatype(QAction *)));
setWindowTitle("Memview");
myScrollArea->setViewport(myMemView);
setCentralWidget(myScrollArea);
resize(theDefaultSize);
}
Window::~Window()
{
}
QActionGroup *
Window::createActionGroup(
QMenu *menu,
const char *names[],
QAction *actions[],
int count,
int def_action)
{
QActionGroup *group = new QActionGroup(this);
for (int i = 0; i < count; i++)
{
actions[i] = new QAction(tr(names[i]), group);
actions[i]->setCheckable(true);
menu->addAction(actions[i]);
}
actions[def_action]->setChecked(true);
return group;
}
//
// MemViewWidget
//
MemViewWidget::MemViewWidget(int argc, char *argv[],
QWidget *parent,
QScrollBar *vscrollbar,
QScrollBar *hscrollbar,
QStatusBar *status)
: QGLWidget(QGLFormat(QGL::NoDepthBuffer), parent)
, myVScrollBar(vscrollbar)
, myHScrollBar(hscrollbar)
, myStatusBar(status)
, myTexture(0)
, myColorTexture(0)
, myPixelBuffer(0)
, myPrevEvents(0)
, myZoom(0)
, myDisplayMode(0)
, myDisplayStack(0)
, myDataType(-1)
, myStopWatch(false)
, myPaintInterval(false)
, myEventTimer(false)
, myDragging(false)
{
// Extract the path to the executable
myPath = argv[0];
size_t pos = myPath.rfind('/');
if (pos != std::string::npos)
myPath.resize(pos+1);
else
myPath = "";
// Skip the program name
argc -= 1;
argv += 1;
// We need mouse events even when no buttons are held down, for status
// bar updates
setMouseTracking(true);
// Use a fixed-width font for the status bar
QFont font("Monospace");
font.setStyleHint(QFont::TypeWriter);
myStatusBar->setFont(font);
const char *ignore = extractOption(argc, argv, "--ignore-bits=");
int ignorebits = ignore ? atoi(ignore) : 2;
myState = new MemoryState(ignorebits);
myZoomState = myState;
myStackTrace = new StackTraceMap;
myMMapMap = new MMapMap;
myLoader = new Loader(myState, myStackTrace, myMMapMap);
if (myLoader->openPipe(argc, argv))
{
// Start loading data in a new thread
myLoader->start();
}
myFastTimer = startTimer(30);
mySlowTimer = startTimer(500);
myPaintInterval.start();
myEventTimer.start();
}
MemViewWidget::~MemViewWidget()
{
delete myLoader;
delete myState;
delete myStackTrace;
delete myMMapMap;
}
void
MemViewWidget::linear()
{
myDisplay.setVisualization(DisplayLayout::LINEAR);
update();
}
void
MemViewWidget::block()
{
myDisplay.setVisualization(DisplayLayout::BLOCK);
changeZoom(myZoom);
update();
}
void
MemViewWidget::hilbert()
{
myDisplay.setVisualization(DisplayLayout::HILBERT);
changeZoom(myZoom);
update();
}
void
MemViewWidget::compact()
{
myDisplay.setCompact(true);
changeZoom(myZoom);
update();
}
void
MemViewWidget::full()
{
myDisplay.setCompact(false);
changeZoom(myZoom);
update();
}
void MemViewWidget::display(QAction *action)
{
myDisplayMode = action->actionGroup()->actions().indexOf(action);
}
void MemViewWidget::stackdisplay() { myDisplayStack = !myDisplayStack; }
void MemViewWidget::datatype(QAction *action)
{
// Subtract 1 so that auto-detect types is -1
myDataType = action->actionGroup()->actions().indexOf(action) - 1;
}
// Load a file into a buffer. The buffer is owned by the caller, and
// should be freed with delete[].
static char *
loadTextFile(const char *filename)
{
std::ifstream is(filename);
if (!is.good())
return 0;
is.seekg(0, std::ios::end);
long length = is.tellg();
is.seekg(0, std::ios::beg);
if (!length)
return 0;
char *buffer = new char[length+1];
is.read(buffer, length);
buffer[length] = '\0';
return buffer;
}
// 512 size texture to accomodate the 500 possible threads supported by
// valgrind.
static const int theColorBits = 9;
static const int theColorSize = (1 << theColorBits);
static int
rinverse(int val)
{
// Radical inverse specialized for 16 bits
int tmp = val;
tmp = ((tmp & 0xAAAA) >> 1) | ((tmp & 0x5555) << 1);
tmp = ((tmp & 0xCCCC) >> 2) | ((tmp & 0x3333) << 2);
tmp = ((tmp & 0xF0F0) >> 4) | ((tmp & 0x0F0F) << 4);
tmp = ((tmp & 0xFF00) >> 8) | ((tmp & 0x00FF) << 8);
return tmp >> (16-theColorBits);
}
static void
fillThreadColors(GLImage<uint32> &colors)
{
const int width = theColorSize;
const float s = 0.75;
const float v = 1;
Color clr;
colors.resize(width, 1);
for (int i = 0; i < width; i++)
{
int idx = rinverse(i);
float h = idx / (float)(width-1);
clr.fromHSV(h, s, v);
colors.setPixel(i, 0, clr.toInt32());
}
}
void
MemViewWidget::initializeGL()
{
// We're doing our own dithering. Though having this enabled didn't
// seem to produce any dithering.
glDisable(GL_DITHER);
const GLuint type = GL_NEAREST;
// Build a texture to store colors used by the shader
glActiveTexture(GL_TEXTURE1);
glGenTextures(1, &myColorTexture);
glBindTexture(GL_TEXTURE_1D, myColorTexture);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, type);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, type);
GLImage<uint32> colors;
fillThreadColors(colors);
glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA,
colors.width(), 0, GL_RGBA,
GL_UNSIGNED_BYTE, colors.data());
// Create the memory state texture
glGenBuffers(1, &myPixelBuffer);
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &myTexture);
glBindTexture(GL_TEXTURE_RECTANGLE, myTexture);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, type);
glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, type);
std::string shader_path;
QGLShader *vshader = new QGLShader(QGLShader::Vertex, this);
shader_path = myPath + "shader.vert";
const char *vsrc = loadTextFile(shader_path.c_str());
vshader->compileSourceCode(vsrc);
delete [] vsrc;
QGLShader *fshader = new QGLShader(QGLShader::Fragment, this);
shader_path = myPath + "shader.frag";
const char *fsrc = loadTextFile(shader_path.c_str());
fshader->compileSourceCode(fsrc);
delete [] fsrc;
myProgram = new QGLShaderProgram(this);
myProgram->addShader(vshader);
myProgram->addShader(fshader);
myProgram->link();
}
void
MemViewWidget::resizeGL(int width, int height)
{
glViewport(0, 0, (GLint)width, (GLint)height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
resizeImage(myZoom);
}
void
MemViewWidget::resizeImage(int zoom)
{
int w = width();
int h = height();
if (zoom < 0)
{
w >>= (-zoom) >> 1; w = SYSmax(w, 1);
h >>= (-zoom) >> 1; h = SYSmax(h, 1);
}
myVScrollBar->setPageStep(h);
myHScrollBar->setPageStep(w);
#ifdef USE_PBUFFER
myImage.setSize(w, h);
#else
myImage.resize(w, h);
#endif
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, myPixelBuffer);
glBufferData(GL_PIXEL_UNPACK_BUFFER, myImage.bytes(), 0, GL_STREAM_DRAW);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}
static void
setScrollMax(QScrollBar *scroll, int64 size, bool with_margin = true)
{
int64 margin = with_margin ? (scroll->pageStep() >> 1) : 0;
int64 nmax = SYSmax(size - scroll->pageStep() + margin, 0ll);
scroll->setMaximum(SYSclamp32(nmax));
scroll->setMinimum(SYSclamp32(-margin));
}
void
MemViewWidget::paintGL()
{
#if 0
StopWatch timer;
fprintf(stderr, "interval %f time ", myPaintInterval.lap());
#endif
#ifdef USE_PBUFFER
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, myPixelBuffer);
myImage.setData((uint32 *)
glMapBufferARB(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY));
#endif
myDisplay.update(*myState, myImage.width(), SYSmax(myZoom, 0));
myDisplay.fillImage(myImage, StateSource(*myZoomState),
myHScrollBar->value(),
myVScrollBar->value());
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_RECTANGLE, myTexture);
#ifdef USE_PBUFFER
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_R32UI,
myImage.width(), myImage.height(), 0, GL_RED_INTEGER,
GL_UNSIGNED_INT, 0 /* offset in PBO */);
#else
glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_R32UI,
myImage.width(), myImage.height(), 0, GL_RED_INTEGER,
GL_UNSIGNED_INT, myImage.data());
#endif
// Unbind the buffer - this is required for text rendering to work
// correctly.
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
myProgram->bind();
myProgram->setUniformValue("theState", 0);
myProgram->setUniformValue("theColors", 1);
myProgram->setUniformValue("theStale", MemoryState::theStale);
myProgram->setUniformValue("theHalfLife", MemoryState::theHalfLife);
myProgram->setUniformValue("theDisplayMode", myDisplayMode);
myProgram->setUniformValue("theDisplayStack", myDisplayStack);
myProgram->setUniformValue("theTime", myState->getTime());
myProgram->setUniformValue("theImageResX", width());
myProgram->setUniformValue("theImageResY", height());
setScrollMax(myVScrollBar, myDisplay.height());
setScrollMax(myHScrollBar, myDisplay.width(),
myDisplay.getVisualization() != DisplayLayout::LINEAR);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0); glVertex3i(-1, -1, -1);
glTexCoord2f(1.0, 0.0); glVertex3i(1, -1, -1);
glTexCoord2f(1.0, 1.0); glVertex3i(1, 1, -1);
glTexCoord2f(0.0, 1.0); glVertex3i(-1, 1, -1);
glEnd();
myProgram->release();
// Render memory contents as text if we're at a sufficient zoom level
paintText();
update();
}
static inline bool
isFloatType(int datatype)
{
switch (datatype)
{
case MV_DataFlt32:
case MV_DataFlt64:
return true;
}
return false;
}
static inline int
getAlignBits(int datatype)
{
switch (datatype)
{
case MV_DataInt64:
case MV_DataFlt64:
return 3;
}
return 2;
}
template <typename FT, typename IT>
static inline FT
intToFloat(IT val)
{
union {
FT fval;
IT ival;
} uval;
uval.ival = val;
return uval.fval;
}
// Peek at a 64-bit value in the tracee
static bool
peekData(pid_t pid, uint64 qaddr, uint64 &buf64)
{
long peekval = ptrace(PTRACE_PEEKDATA,
pid, (void *)qaddr, NULL);
if (peekval == -1)
return false;
buf64 = (uint64)peekval;
if (sizeof(long) == 4)
{
// long is a different size on 32-bit platforms...
peekval = ptrace(PTRACE_PEEKDATA,
pid, (void *)(qaddr + 4), NULL);
if (peekval == -1)
return false;
buf64 |= (uint64)peekval << 32;
}
return true;
}
struct Text {
int x;
int y;
QString str;
};
void
MemViewWidget::paintText()
{
const int xmargin = 4;
int pwidth = width() / myImage.width();
int pheight = height() / myImage.height();
QFont font;
QFontMetrics metrics(font);
if (pheight < 2*metrics.height())
return;
// Use ptrace to stop the process and inspect data
pid_t pid = myLoader->getChild();
if (ptrace(PTRACE_ATTACH, pid, NULL, NULL))
return;
// Wait for the process to stop on a signal
waitpid(pid, 0, 0);
std::vector<Text> text_list;
for (int i = 0; i < myImage.height(); i++)
{
for (int j = 0; j < myImage.width(); j++)
{
uint64 qaddr = myDisplay.queryPixelAddress(*myState,
myHScrollBar->value() + j,
myVScrollBar->value() + i);
if (!qaddr)
continue;
// Either use the specified data type or if it's -1, get the
// type from the value
int datatype = myDataType;
if (datatype < 0)
{
uint64 off;
auto page = myState->getPage(qaddr, off);
if (page.exists())
datatype = page.state(off).dtype();
else
datatype = MV_DataInt32;
}
const uint64 min_align_bits = getAlignBits(datatype);
const uint64 min_align = 1 << min_align_bits;
qaddr <<= myState->getIgnoreBits();
if (qaddr & (min_align-1))
continue;
// Get the value. If the address wasn't mapped, peekData()
// will return false.
uint64 val;
if (!peekData(pid, qaddr, val))
continue;
int x = (j*width())/myImage.width() + xmargin;
int y = (i*height())/myImage.height() +
(pheight + metrics.height())/2;
QString str;
if (min_align_bits == 2)
{
if (qaddr & min_align)
val >>= 32;
else
val &= 0xFFFFFFFF;
if (isFloatType(datatype))
str.sprintf("%f", intToFloat<float>((uint32)val));
else
str.sprintf("%x", (uint32)val);
}
else
{
if (isFloatType(datatype))
str.sprintf("%g", intToFloat<double>(val));
else
str.sprintf("%llx", val);
}
// Shorten the text so that it fits within the desired width.
// This will add the "..." if it's too long.
str = metrics.elidedText(
str, Qt::ElideRight, pwidth - 2*xmargin);
text_list.push_back(Text{x, y, str});
}
}
// Detach - this will restart the process
ptrace(PTRACE_DETACH, pid, NULL, NULL);
// Render text after restarting the process so that we're only slowing
// down draw time (not execution)
for (auto it = text_list.begin(); it != text_list.end(); ++it)
renderText(it->x, it->y, it->str, font);
}
bool
MemViewWidget::event(QEvent *event)
{
if (event->type() == QEvent::ToolTip)
{
QHelpEvent *helpEvent = static_cast<QHelpEvent *>(event);
QPoint pos = zoomPos(helpEvent->pos(), myZoom);
uint64 qaddr = myDisplay.queryPixelAddress(*myZoomState,
myHScrollBar->value() + pos.x(),
myVScrollBar->value() + pos.y());
uint64 off;
auto page = myZoomState->getPage(qaddr, off);
if (qaddr && page.exists() && page.state(off).time())
{
qaddr <<= myZoomState->getIgnoreBits();
std::string trace = myStackTrace->findClosest(qaddr);
if (!trace.empty())
QToolTip::showText(helpEvent->globalPos(), trace.c_str());
else
QToolTip::hideText();
}
else
QToolTip::hideText();
return true;
}
return QWidget::event(event);
}
void
MemViewWidget::resizeEvent(QResizeEvent *event)
{
QGLWidget::resizeEvent(event);
update();
}
QPoint
MemViewWidget::zoomPos(QPoint pos, int zoom) const
{
if (zoom < 0)
{
pos.rx() *= myImage.width();
pos.rx() /= width();
pos.ry() *= myImage.height();
pos.ry() /= height();
}
return pos;
}
void
MemViewWidget::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
{
myStopWatch.start();
myDragging = true;
myDragRemainder = QPoint(0, 0);
myVelocity = std::queue<Velocity>();
}
myMousePos = event->pos();
}
void
MemViewWidget::mouseMoveEvent(QMouseEvent *event)
{
if (event->buttons() & Qt::LeftButton)
{
double time = myStopWatch.elapsed();
QPoint dir = myMousePos - event->pos();
panBy(dir);
if (myVelocity.size() >= 5)
myVelocity.pop();
myVelocity.push(Velocity(dir.x(), dir.y(), time));
}
myMousePos = event->pos();
update();
}
static const double theDragDelay = 0.1;
void
MemViewWidget::mouseReleaseEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton)
{
myDragging = false;
// Compute the average velocity. We'll require at least 2 samples
// to avoid spikes. Only consider samples within a specified time
// interval.
int size = myVelocity.size();
double time = myStopWatch.elapsed() - theDragDelay;
Velocity vel(0, 0, 0);
while (myVelocity.size())
{
if (myVelocity.front().time > time)
vel += myVelocity.front();
else
size--;
myVelocity.pop();
}
if (size > 1)
{
vel *= 1.0 / theDragDelay;
myVelocity.push(vel);
}
myStopWatch.start();
}
}
void
MemViewWidget::wheelEvent(QWheelEvent *event)
{
const bool linear = myDisplay.getVisualization() == DisplayLayout::LINEAR;
const int inc = linear ? 1 : 2;
int zoom = myZoom;
if (event->delta() < 0)
{
if (zoom < 0)
zoom += 2;
else
zoom += inc;
}
else if (event->delta() > 0)
{
if (zoom <= 0)
zoom -= 2;
else
zoom -= inc;
}
changeZoom(zoom);
}
static void
minScroll(QScrollBar *scroll, int64 x, int64 size, bool zoomout)
{
int64 ox = x;
x += scroll->value();
if (zoomout)
{
x += 1;
x >>= 1;
}
else
{
x <<= 1;
size <<= 1;
}
x -= ox;
setScrollMax(scroll, size);
scroll->setValue(SYSclamp32(x));
}
static void
magScroll(QScrollBar *scroll, int64 x, int64 size, bool zoomout,
int64 winsize, int64 psize, int64 nsize)
{
if (zoomout)
{
x = (x*(psize+1)) / winsize;
x = scroll->value() - x;
}
else
{
x = (x*(nsize+1)) / winsize;
x += scroll->value();
}
setScrollMax(scroll, size);
scroll->setValue(SYSclamp32(x));
}
static void
magScrollLinear(QScrollBar *scroll, int64 x,
int64 winheight, int64 size,
int64 pwidth, int64 pheight,
int64 nwidth, int64 nheight)
{
x = (((x*pheight)/winheight + scroll->value())*pwidth)/nwidth -
(x*nheight)/winheight;
size = (size * pheight) / nheight;
setScrollMax(scroll, size);
scroll->setValue(SYSclamp32(x));
}
void
MemViewWidget::changeZoom(int zoom)
{
const bool linear = myDisplay.getVisualization() == DisplayLayout::LINEAR;
// Zoom in increments of 2 for block display
if (!linear)
zoom &= ~1;
// Zoom in increments of 2 for magnification
if (zoom < 0)
zoom = -((-zoom) & ~1);
zoom = SYSclamp(zoom, -16, 30);
if (zoom != myZoom)
{
if (zoom > 0)
{
myZoomState = new MemoryState(myState->getIgnoreBits()+zoom);
myLoader->setZoomState(myZoomState);
}
else
{
myLoader->clearZoomState();
myZoomState = myState;
}
const bool zoomout = zoom > myZoom;
QPoint zpos = myMousePos;
if (zoom < 0 || myZoom < 0)
{
int64 pwidth = myImage.width();
int64 pheight = myImage.height();
// This makes a GL call
resizeImage(zoom);
if (!linear)
{
magScroll(myHScrollBar, zpos.x(), myDisplay.width(), zoomout,
width(), pwidth, myImage.width());
magScroll(myVScrollBar, zpos.y(), myDisplay.width(), zoomout,
height(), pheight, myImage.height());
}
else
{
magScrollLinear(myVScrollBar,
zpos.y(), height(), myDisplay.height(),
pwidth, pheight, myImage.width(), myImage.height());
}
}
else
{
if (!linear)
minScroll(myHScrollBar, zpos.x(), myDisplay.width(), zoomout);
minScroll(myVScrollBar, zpos.y(), myDisplay.height(), zoomout);
}
myZoom = zoom;
}
}
void
shortenDrag(double &val, double delta)
{
delta *= 2.0;
if (val > 0)
{
val -= delta*val;
val = SYSmax(val, 0.0);
}
else if (val < 0)
{
val -= delta*val;
val = SYSmin(val, 0.0);
}
}
void
MemViewWidget::timerEvent(QTimerEvent *event)
{
// Fast timer
if (event->timerId() == myFastTimer)
{
if (!myDragging && myVelocity.size())
{
Velocity &vel = myVelocity.front();
double time = myStopWatch.lap();
QPoint dir((int)(vel.x * time + 0.5F),
(int)(vel.y * time + 0.5F));
if (panBy(dir))
{
update();
}
shortenDrag(vel.x, time);
shortenDrag(vel.y, time);
}
}
else if (event->timerId() == mySlowTimer)
{
uint64 total_events = myLoader->getTotalEvents();
myEventInfo.sprintf("%lld events", total_events);