I want to make an annotation in a gif image using ImageMagick and specifically Magick++, the code is quite simple, but the output image has artifacts in the text, if the gif does not move, then the artifacts do not appear, here:
here is the code itself, very simple:
int main()
{
InitializeMagick(nullptr);
list<Image> *imageList = new list<Image>();
try {
readImages(imageList, "source.gif" );
}
catch( exception &error_ )
{
cout << "Caught exception: " << error_.what() << endl;
return 1;
}
for(Image &i : *imageList) {
i.fontPointsize(36);
i.font("helvetica-bold");
i.fillColor(Color("white"));
i.fontStyle(MagickCore::ObliqueStyle);
i.annotate("why are you lagging", SouthGravity);
}
writeImages(imageList->begin(), imageList->end(), "/home/deymos/GifnText/n.gif");
return 0;
I tried to save the list of images as png and this is what I saw when the movement on the gif started:
is it possible to fix it, or is it a bug?
If this cannot be fixed, maybe there are similar tools with which I can implement text on gifs? or at least a library that can disassemble gifs into images and fold, I can do the rest with qt, tnx.
I am attempting to load a wxIcon in Windows by loading from a system DLL (as the mime system told me that the icon for such a file type was in the DLL), eg.
wxIcon icon;
icon.LoadFile("C:\\WINDOWS\\system32\\zipfldr.dll", wxICON_DEFAULT_TYPE);
This fails but I was wondering if there was any way in the codebase of loading this, other than resorting to native Win32 functions.
Also, if there are native Win32 functions, does anyone know what they are?
EDIT: I have tried the following with no success:
::wxInitAllImageHandlers();
wxMimeTypesManager manager;
wxFileType* type = manager.GetFileTypeFromExtension("sys");
wxIconLocation location;
if (type->GetIcon(&location))
{
// location is something like C:\WINDOWS\system32\imageres.dll
wxIcon icon;
if (!icon.LoadFile(location.GetFileName(), wxBITMAP_TYPE_ICON /*I have tried wxICON_DEFAULT_TYPE too*/))
{
// Failed!
}
}
EDIT 2: In response to VZ, I have tried the following with no success sadly:
::wxInitAllImageHandlers();
wxMimeTypesManager manager;
wxFileType* type = manager.GetFileTypeFromExtension("sys");
wxIconLocation location;
if (type->GetIcon(&location))
{
// location is something like C:\WINDOWS\system32\imageres.dll,
//with an appropriate index as retrieved by location.GetIndex(), which is -67.
wxIcon icon(location);
if (!icon.IsOk())
{
BREAK;
// Failed!
}
}
EDIT 3:
Thanks for everyone's help - works fine if I use wxBITMAP_TYPE_ICO instead of wxBITMAP_TYPE_ICON (notice the N), and also I was putting my test code in my app's constructor instead of in ::OnInit. It worked in OnInit but not in the constructor so that's a lesson learned!
Thanks everyone for the help and speedy responses, much appreciated as always.
It should work if you specify type wxBITMAP_TYPE_ICO.
The first argument to LoadFile() must specify the icon resource ID when using wxBITMAP_TYPE_ICO (which is indeed what you need to use when loading icons from files, and not resources of the current module), i.e. you're also missing the ;N part at the end, where N is the value returned by wxFileTypeInfo::GetIconIndex().
But to avoid dealing with this explicitly, you should just use wxFileType::GetIcon() and construct wxIcon from the wxIconLocation filled in by it.
For example, this:
diff --git a/samples/minimal/minimal.cpp b/samples/minimal/minimal.cpp
index 0d91f7fc75..3623aacc56 100644
--- a/samples/minimal/minimal.cpp
+++ b/samples/minimal/minimal.cpp
## -123,6 +123,12 ## bool MyApp::OnInit()
if ( !wxApp::OnInit() )
return false;
+ wxIcon icon(wxIconLocation(R"(c:\Windows\system32\imageres.dll)", -67));
+ if ( icon.IsOk() )
+ {
+ wxLogMessage("Loaded icon of size %d*%d", icon.GetWidth(), icon.GetHeight());
+ }
+
// create the main application window
MyFrame *frame = new MyFrame("Minimal wxWidgets App");
shows the expected message about loading the icon of size 32 by 32.
I'm converting an app that was written in Silverlight, and so far I've succeeded in solving all of the problems, except for one:
For some reason, the emulator refuses to play any audio files of the app, and it doesn't even throw an exception. I've checked, and in the ringtone category it can make sounds.
The original code was :
<Grid x:Name="sharedFullScreenFilePathContainer"
Tag="{Binding StringFormat=\{0\},Converter={StaticResource fullScreenImageConverter}}">
<Image x:Name="fullScreenImage" Stretch="Fill"
Source="{Binding ElementName=sharedFullScreenFilePathContainer,Path=Tag, StringFormat=../Assets/images/\{0\}.jpg}"
ImageFailed="onFullScreenImageFailedToLoad" MouseLeftButtonDown="onPressedOnFullScreenImage" />
<MediaElement x:Name="mediaPlayer" AutoPlay="True"
Source="{Binding ElementName=sharedFullScreenFilePathContainer,Path=Tag, StringFormat=../Assets/sounds/\{0\}.wma}" />
</Grid>
so, the image that I set to this item's context is really shown, but the sound that really exists on the path I set to it doesn't play (I've checked in the "Bin" folder).
I've tried to use code instead of xaml, but I still have the same problem.
I've tried this (though it's usually used for background music):
AudioTrack audioTrack = new AudioTrack(new Uri("../Assets/sounds/" + fileToOpen, UriKind.Relative), "", "", "", null);
BackgroundAudioPlayer player = BackgroundAudioPlayer.Instance;
player.Track = audioTrack;
player.Play();
It didn't play anything, and also didn't throw any exception.
I've also tried the next code, but it throws an exception (file not found exception) probably because I don't call it right:
Stream stream = TitleContainer.OpenStream("#Assets/sounds/" + fileToOpen);
SoundEffect effect = SoundEffect.FromStream(stream);
FrameworkDispatcher.Update();
effect.Play();
I've also tried using wma files but it also didn't work.
I also tried to play with the "copy to output directory" parameter of the mp3 files (to "always" and "only if new" ) and with the "build action" parameter (to "none" and "content" ). Nothing helps.
Can anyone please help me? I didn't develop for Silverlight/WP for a very long time and I can't find out how to fix it .
Btw, since later I need to know when the sound has finished playing (and also to be able to stop it), I would like to use code anyway. I would be happy if you could also tell me how to do it too (I can ask it on a new post if needed).
EDIT:
ok , i've found out the problem : i kept getting a weird exception when using the MediaPlayer.Play() method , and after checking out about the exception , i've found out that it's a known issue , and that i need to call FrameworkDispatcher.Update(); right before i call the Play() method .
so the solution would be to do something like this:
Song song = Song.FromUri(...);
MediaPlayer.Stop();
FrameworkDispatcher.Update();
MediaPlayer.Play(song);
the exception is:
'System.InvalidOperationException' occurred in System.Windows.ni.dll"
i've found the solution here .
Now the question is why , and how come I didn't find anything related to it in the demos of windows phone ? Also , i would like to know what this function does .
ok , since nobody gave me an answer to both questions , and I still wish to give the bounty , I will ask another question :
If there is really no solution other than using the MediaPlayer class for windows phone , how do i capture the event of finishing playing an audio file ? Even getting the audio file duration doesn't work (keeps returning 0 length , no matter which class i've tried to use) ...
The BackgroundAudioPlayer can play files only from isolated storage or from a remote URI, that is why you can here anything!
If you have your file as resources in your app, you must first copy them to the isolated store, and then make a reference to the file in the isolated store to your BackgroundAudioPlayer.
private void CopyToIsolatedStorage()
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
string[] files = new string[]
{ "Kalimba.mp3",
"Maid with the Flaxen Hair.mp3",
"Sleep Away.mp3" };
foreach (var _fileName in files)
{
if (!storage.FileExists(_fileName))
{
string _filePath = "Audio/" + _fileName;
StreamResourceInfo resource = Application.GetResourceStream(new Uri(_filePath, UriKind.Relative));
using (IsolatedStorageFileStream file = storage.CreateFile(_fileName))
{
int chunkSize = 4096;
byte[] bytes = new byte[chunkSize];
int byteCount;
while ((byteCount = resource.Stream.Read(bytes, 0, chunkSize)) > 0)
{
file.Write(bytes, 0, byteCount);
}
}
}
}
}
}
And then you can make a list of your songs
private static List<AudioTrack> _playList = new List<AudioTrack>
{
new AudioTrack(new Uri("Kalimba.mp3", UriKind.Relative),
"Kalimba",
"Mr. Scruff",
"Ninja Tuna",
null),
new AudioTrack(new Uri("Maid with the Flaxen Hair.mp3", UriKind.Relative),
"Maid with the Flaxen Hair",
"Richard Stoltzman",
"Fine Music, Vol. 1",
null),
new AudioTrack(new Uri("Sleep Away.mp3", UriKind.Relative),
"Sleep Away",
"Bob Acri",
"Bob Acri",
null),
// A remote URI
new AudioTrack(new Uri("http://traffic.libsyn.com/wpradio/WPRadio_29.mp3", UriKind.Absolute),
"Episode 29",
"Windows Phone Radio",
"Windows Phone Radio Podcast",
null)
};
And play your tracks!
private void PlayNextTrack(BackgroundAudioPlayer player)
{
if (++currentTrackNumber >= _playList.Count)
{
currentTrackNumber = 0;
}
PlayTrack(player);
}
private void PlayPreviousTrack(BackgroundAudioPlayer player)
{
if (--currentTrackNumber < 0)
{
currentTrackNumber = _playList.Count - 1;
}
PlayTrack(player);
}
private void PlayTrack(BackgroundAudioPlayer player)
{
// Sets the track to play. When the TrackReady state is received,
// playback begins from the OnPlayStateChanged handler.
player.Track = _playList[currentTrackNumber];
}
If you want the MediaElement to work from your code you can do something like this!
MediaElement me = new MediaElement();
// Must add the MediaElement to some UI container on
// your page or some UI-control, otherwise it will not play!
this.LayoutRoot.Children.Add(me);
me.Source = new Uri("Assets/AwesomeMusic.mp3", UriKind.RelativeOrAbsolute);
me.Play();
Use the MediaElement instead, this can play media files stored in your application, but stops playing when the application stops (you can make some advance chance to your app so it keep running, but it will not work very well)
In your XAML:
<Button x:Name="PlayFile"
Click="PlayFile_Click_1"
Content="Play mp3" />
In your Code behind:
MediaElement MyMedia = new MediaElement();
// Constructor
public MainPage()
{
InitializeComponent();
this.LayoutRoot.Children.Add(MyMedia);
MyMedia.CurrentStateChanged += MyMedia_CurrentStateChanged;
MyMedia.MediaEnded += MyMedia_MediaEnded;
}
void MyMedia_MediaEnded(object sender, RoutedEventArgs e)
{
System.Diagnostics.Debug.WriteLine("Ended event " + MyMedia.CurrentState.ToString());
// Set the source to null, force a Close event in current state
MyMedia.Source = null;
}
void MyMedia_CurrentStateChanged(object sender, RoutedEventArgs e)
{
switch (MyMedia.CurrentState)
{
case System.Windows.Media.MediaElementState.AcquiringLicense:
break;
case System.Windows.Media.MediaElementState.Buffering:
break;
case System.Windows.Media.MediaElementState.Closed:
break;
case System.Windows.Media.MediaElementState.Individualizing:
break;
case System.Windows.Media.MediaElementState.Opening:
break;
case System.Windows.Media.MediaElementState.Paused:
break;
case System.Windows.Media.MediaElementState.Playing:
break;
case System.Windows.Media.MediaElementState.Stopped:
break;
default:
break;
}
System.Diagnostics.Debug.WriteLine("CurrentState event " + MyMedia.CurrentState.ToString());
}
private void PlayFile_Click_1(object sender, RoutedEventArgs e)
{
// Play Awesome music file, stored as content in the Assets folder in your app
MyMedia.Source = new Uri("Assets/AwesomeMusic.mp3", UriKind.RelativeOrAbsolute);
MyMedia.Play();
}
Audio track plays audio files stored in isolated storage or streamed over the internet.
Playing audio files stored within the application package works fine for me. I got files named like "Alarm01.wma" in project folder Resources\Alarms. I then play these sounds like this:
using Microsoft.Xna.Framework.Media;
...
Song s = Song.FromUri("alarm", new Uri(#"Resources/Alarms/Alarm01.wma", UriKind.Relative));
MediaPlayer.Play(s);
Also don't forget to reference Microsoft.Xna.Framework library.
I guess it should work fine for mp3 files and files stored in IsolatedStorage as well.
I'm writing simple pomodoro application, which is basically countdown timer. Right now, I've got countdown working, but the weird thing is that when I add another attribute to my class (arbitrary), I get Sedmentation fault error.
Using gdb, the problem should be here:
void Status::showPomodoroTime() {
QTime time = pomodoroTime->addSecs(elapsed);
activeTime->display(time.toString("mm:ss"));
}
where activeTime is QLCDNumber widget and elapsed is int.
More context:
void Status::createDefaultIntervals()
{
pomodoroInterval = new QTime(0, 25);
pomodoroBreak = new QTime(0, 5);
pomodoroLongBreak = new QTime(0, 15);
}
void Status::run()
{
if (pomodoroActive == STOP) {
pomodoroTime = pomodoroInterval;
showPomodoroTime();
}
pomodoroActive = RUN;
updateStatusArea();
timerTick();
}
CreateDefaultInterval definitely runs before showPomodoroTime.
What bugs me, that whole application works fine. Just when I add another attribute, it starts to throw sedfault.
How can variable declaration in *.h file cause segfault in *.cpp?
If you want more code, I can put it anywhere. I just don't know, what place is persistent enough. Don't want to post it here (about 300 lines of code).
check if(pomodoro!= NULL) and then do addSecs().
pomodoroTime is probably uninitialized or deleted
Can someone provide an example of how to load a .svg file and display it using C/C++ and any library? I'm wondering if you will use SDL, cairo, or what.
Helltone,
check out http://cairographics.org/cairomm/
Might make things a little easier.
As Pavel put it, QtSvg is the way to go i believe. It is easier to use but in our team we have faced performance issues with QtSvg especially on Linux. So we decided to directly parse the SVG file XML by hand and render it using Qt itself. This turned out to be much faster.
pseudocode:-
// Read the SVG file using XML parser (SAX)
void SvgReader::readFile()
{
QFile file(<some svg filename>);
if (!file.open(QFile::ReadOnly | QFile::Text)) {
qWarning("Cannot open file");
return;
}
QString localName;
QXmlStreamAttributes attributes;
pXml = new QXmlStreamReader(&file);
pXml->setNamespaceProcessing(false);
while (!pXml->atEnd()) {
switch (pXml->readNext()) {
case QXmlStreamReader::StartElement:
localName = pXml->name().toString();
if (localName.compare(<some element path>) == 0) {
attributes = pXml->attributes();
QStringRef data = attributes.value(<some attribute name>);
// parse/use your data;
}
// similarly other case statements
}
}
}
QtSvg module might be helpful.
you may try boost.svg_plot
You can try lunasvg.
#include <lunasvg/document.h>
int main()
{
auto document = Document::loadFromFile("example.svg");
auto bitmap = document->renderToBitmap();
// do something useful with bitmap here.
}