I found some blurring code at http://incubator.quasimondo.com/processing/stackblur.pde. Any ideas how to feed it, and get back, a UIImage or CGImageRef or something usable on the iPhone?
I'm not sure what format their BImage file is (Bitmap?) and what corresponds to it in Cocoa Touch.
Thanks.
That code is in JVM-based Processing language. There are some attempts to port Processing on iPhone, but, I guess, at this stage, you'll either have to port that code by hands, digging in the entrails of the Processing implementation, or have to find yourself some another reference.
Update: On the second glance, they seem to be working with the plain low-level RGB data. So the code should be straightforward to port. Processing is close enough to Java, Java is close enough to C++, and you may compile C++ code as Objective C (just use .mm extension). Just copy-paste the code, fix syntax errors, and run it on your RGB data. Chances are good that you'll be able to get away with just that.
Dig into CGImage docs for information on how to get raw RGB data.
Update 2: The code you've linked to appears to be the stack blur. Author's page says there is a MIT-licensed C++ port of it in the Fog library (search here for Fog::Raster_C - StackBlur).
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basically the title says it all. I'm working on a model that needs (there is no way around it) to load data from a website, parse it and pass it onto another block. I thought I could use an S-Function written in C++, which didn't properly work, then I tried to use webread()
which also didn't work in Simulink because I can't use extrinsic functions on the device this will run on.
I thought I could work around it by downloading the file externally and then reading it through fscanfbut it turned out that Matlab CODER doesn't support that as well.
After putting 2 1/2 days into this now, I'm asking myself whether it is even possible to do something like an HTTP Request through a Simulink block. That's why I went here to ask that question. Thanks for every answer!
I figured out a way to do it with a C++ S-Function by now.
I also created a GitHub Repo for it. If you're stuck with the same problem as I was, try to take a look at this. I'm pretty sure it will help you.
I am currently trying to make some modifications to the incoming WebRTC video stream in the AppRTC app for iOS in Swift (which in turn is based on this Objective-C version). To do so, I need access to the data which is stored in the frame objects of class RTCI420Frame (which is a basic class for the Objective-C implementation of libWebRTC). In particular, I need an array of bytes: [UInt8] and Size of the frames. This data is to be used for further processing & addition of some filters.
The problem is, all the operations on RTCVideoTrack / RTCEAGLVideoView are done under the hood of pre-compiled libWebRTC.a, it is compiled from the official WebRTC repository linked above and it's fairly complicated to get a custom build of it, so I'd prefer to go with the build available in the example iOS project; in my understanding it's supposed to have all the available functionality in it.
I was looking into RTCVideoChatViewController class and in particular, remoteView / remoteVideoTrack, but had no success in accessing the frames themselves, spent a lot of time researching the libWebRTC sources in official repo but still can't wrap my head around the problem of accessing the frames data for own manipulations with it. Would be glad for any help!
Just after posting the question I had a luck in finding the sneaky data!
You have to add the following property to RTCEAGLVideoView.h file:
#property(atomic, strong) RTCI420Frame* i420Frame;
In the original implementation file there is the i420Frame property but it wasn't exposed in the iOS project's header file for the class. Adding the property allows you to get view's current frame.
I'm still in search of a more elegant way of getting the stream data directly, without the need to look into remoteView contents, will update the answer once I find it.
Last days I search for best and shortest way to convert html files to pdf. Since I create my html files with C program and see them through gtkwebkit which uses cairo it should be some efficient and direct way to convert content of showed page to html with C (I think).
But can't find any example or direction to go on the net.
Until now, among different virtual printers, I find only commandline tools which are maded in perl or which depends on qt what is not wanted.
Please for any suggestion, example or advice to get this functionality from gtkwebkit and if not, maybe something with some tiny C library.
As far as I can tell from reading the documentation (haven't tried it out myself):
Get the main frame with webkit_web_view_get_main_frame().
Create a GtkPrintOperation with gtk_print_operation_new().
Set the export-file property on your print operation to be the name of the PDF you want to export to.
Print the frame with webkit_web_frame_print_full(). Make sure to pass GTK_PRINT_OPERATION_ACTION_EXPORT as the 'action' parameter.
I once wrote some code, to accomplish that without opening a window. But then I ran into a problem with using that code from multiple threads (in a webserver e.g.). I made some research and I figured out that gtk itself is single threaded. So I made my code thread safe, by queuing the print operations to the main thread. Anyway, if it helps, check it out... https://github.com/gnudles/wkgtkprinter
Is there any API/SDK to support tts (text to speech) in Marmalade?
I've had some success porting Flite (http://www.speech.cs.cmu.edu/flite/) to the Marmalade environment. It produces wave files and raw, in-memory buffers (which can then be played using s3eSound directly) fine.
The s3eSound adapter (which plays the text directly from within flite) is a work in progress, so, while it does produce something close to recognisable speech, it is also obviously bugged. For my purposes, the raw buffers are more useful anyway, but feel free to try to fix it up.
You can see what I've done here https://github.com/madmaw/marmalade-flite
There is no specific API provided by Marmalade however you may be able to use the EDK if native APIs provide this functionality on iOS or Android.
https://www.madewithmarmalade.com/devnet/docs#/main/extensions.html
I am getting really desperate here. I working with Xcode, trying to implement some OpenGL stuff on the iPhone. I have to write a Shader for Phong-Lighting. I got as far as declaring my geometry (vertices, indices, calculating etc.) and passing the respective arguments as attributes to the shader (written in GLSL). Using these attributes works fine, some really basic shader programs compile correctly and give the expected output.
Now I'm trying to start with some more advanced calculations, for which I need to use some of the built-in attributes of GLSL, namely i.e. the "gl_NormalMatrix", but whenever I try that, the program crashes and I get an "ERROR: 0:3: Use of undeclared identifier 'gl_NormalMatrix'".
It happens identically whenever use any of the built-in attributes such as gl_Vertex, gl_Normal etc.
Are these attributes not available in GLSL on the iPhone or am I missing something? Maybe I haven't fully understood how this works. As mentioned, passing my own vertex attributes into the shader works fine, and I am also wondering how the program should "know" the correct values "on its own" - so the whole concept of built-in attributes is still a bit confusing to me. But whenever I try to run some shaders I found online to see if something happens, I get these errors thrown, even though everyone else seems to use built-in attributes extensively when writing shaders.
I really hope someone here can shed some light on this. Thousand thanks in advance!
Julia
Those attributes aren't available in GL ES, whether on the iPhone or elsewhere. And the same goes for WebGL. You need to write your own matrix code, or use GLKit if you're supporting only iOS 5+, and supply attributes for yourself. See Kronos' reference card for an incredibly concise summary of what made it into ES 2.0 — amongst other things it lists all the available built-in special variables as:
gl_Position
gl_PointSize
gl_FragCoord
gl_FrontFacing
gl_PointCoord
gl_FragColor
gl_FragData[n]
GLKit's maths stuff is really good because it inlines and uses the ARM's NEON SIMD unit. I consider it a sufficient reason to specify iOS 5 as a minimum in all new GL projects.