dibs | Docker Image Build System
kandi X-RAY | dibs Summary
kandi X-RAY | dibs Summary
Dibs makes it simple to turn code into Docker images. To some extent, it can be seen as an alternative to using a Dockerfile, with the difference that dibs provides finer control over the different phases and makes it easier to land on a trimmed image.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of dibs
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QUESTION
I have the following code
...ANSWER
Answered 2022-Jan-28 at 16:00It's certainly possible (permissible) in terms of the specification of API that each time you call LockBits, the memory aperture you get could be presented differently. You have no access to the bits whatsoever until you lock them, so it's totally up to the implementation how to present those bits to you after you lock them. The API permits a signed Stride, so the implementation could take advantage of that to the extent it wants to. When you unlock the bits and then lock them again, the API is permitted to present the bits to you at a different address, with a different stride.
So you should probably be prepared for the eventuality that the stride is different between different calls to LockBits of the same bitmap. (Write your code in a way that supports positive and negative strides.) Honestly, I can't see the advantage of assuming that the memory is arranged with the same stride sign on subsequent LockBits calls.
As for whether or not that actually happens in the field with a particular implementation is less interesting a question to me. Even if it doesn't happen right now, it could happen with an update that arrives tomorrow because, like I said, it's up to the implementation. But having said that, typically once the original bitmap memory layout is determined, it will likely stay the same for reasons of efficiency. Changing the row order would involve, minimally, copying the bits to a different region of memory, so it's more efficient to leave it alone if possible.
Here's a case where you can observe different strides on the same bitmap. Suppose you have a bitmap stored in a bottom-up format natively on disk. After being read from disk, but being locked in a non-native format, the implementation flips it around after transcoding it to a different (e.g. wider) pixel format. Locking pixels in PixelFormat.Format16bppRgb555 natively might give you bottom up, but then locking them in PixelFormat.Format32bppRgb might flip the row order and present a buffer with positive stride because that's the way the internal transcoder might work: to always allocate a top-down destination for the new format even if the source format is bottom-up.
See this source code as evidence that this can happen in practice, where it always chooses a positive stride for bitmaps locked in non-native formats even if the source format had a negative stride.
As another example, an implementation may choose to perform a copy/transcode when the locked rectangle doesn't meet some criteria (e.g. multiple of 4 bytes width) resulting in the stride of the buffer allocated for the copied bits, which is potentially different from the original.
QUESTION
I have created a consumable COM Class Library.
The class library gets the image of a camera. It's of type Image / Bitmap.
I consume the class library in VB6, and I need to show this image in VB6.
How could I convert this System.Drawing.Image to something that VB6 can display?
Can I use a DIB (using CreateDIBSection, etc.)?
If yes, how exactely can a System.Drawing.Image be converted to a DIB?
Thank you!
...ANSWER
Answered 2020-Apr-22 at 20:03Here's what I've done in the past. First, a couple prerequisites:
- you get a Byte() from the COM Class Library
- you set a reference to Microsoft Windows Image Aquisition Library
With these in place, the code is pretty simple. Camera is a COM Class Library where the Retrieve method returns a Byte() that gets loaded into an Image control:
QUESTION
In a camera application bitmap pixel arrays are retrieved from a streaming camera. The pixel arrays are captured by writing them to a named pipe, where on the other end of the pipe, ffmpeg retrieves them and creates an AVI file.
I will need to create one custom frame (with custom text on), and pipe its pixels as the first frame in the resulting movie.
The question is how can I use a TBitmap (for convenience) to
Create a X by Y monochrome (8 bit) bitmap from scratch, with custom text on. I want the background to be white, and the text to be black. (Mostly figured this step out, see below.)
Retrieve the pixel array that I can send/write to the pipe
Step 1: The following code creates a TBitmap and writes text on it:
...ANSWER
Answered 2020-Jan-16 at 01:20TBitmap has a PixelFormat property to set the bit depth.
TBitmap has a HandleType property to control whether a DDB or a DIB is created. DIB is the default.
Since you are passing BMPs around between different systems, you really should be using DIBs instead of DDBs, to avoid any corruption/misinterpretation of the pixel data.
Also, this line of code:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install dibs
.git indicates that the whole project is tracked with ŋit;
app.pl is a Perl program;
cpanfile details the module dependencies of the Perl program;
dibs.yml is `dibs’s configuration file;
prereqs is a directory for storing pre-requirements files
alpine.build and alpine.bundle are two programs that, when executed inside a container, make sure to install the OS packages needed by app.pl or any of the modules that will be installed by cpanfile. Each program installs the requirements for a specific phase, in this case build and bundle represent the build phase (where artifacts are generated) and the bundle phase (where the artifacts are put in place along with the runtime environment).
the name is used for temporary images
it’s possible to define named packs and refer to them later
an action named default is what is executed… by default
this is the specification of a stroke, based on the basic pack.
this is the specification of a sketch (because it contains a list of actions)
enviles are similar to environment variables, but less invasive
this is equivalent to FROM in a Dockerfile
this "calls" the `prereqs' stroke defined elsewhere (above in this case)
this is a stroke where a name is assigned explicitly, so that it will be shown when executed
this is an immediate pack that is saved as a script and then executed inside the container
adding a commit sets additional traits of the image layer, e.g. entrypoint, cmd, user, …
this is a frame, i.e. the actual saving of an image
installation of pre-requisites (calling the prereqs stroke defined above). The script that install pre-requisites uses the variable DIBS_PREREQS to select the right prerequisites script, which will be prereqs/alpine.build in this case.
"compilation" of the Perl code. This reduces to the installation of modules as specified in file cpanfile
save of app.pl (main program) and local (where installed modules are placed) inside the cache directory (in particular, in the app sub-directory)
starts from the same base image alpine:3.6
install pre-requisites. In this case DIBS_PREREQS is set to bundle, so the prerequisites program that will be run is prereqs/alpine.bundle. This is an example of reuse, because the same script (prereqs in the basic pack) is used to obtain different results in different conditions;
artifacts are copied from the cache to the final target destination (in /app). This is the last "layer" that is added to the image, so there is also the specification of a commit section to set the entrypoint and the cmd to be executed by default.
the last action of the sketch is a frame that saves the final container as an image with two tags: exadev:latest and exadev:0.3.
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