cairo | Sources and windows binaries | Graphics library

Declare %builtins output at the top of your code so that the compiler will know that you use an implicit argument (output_ptr) in your main function and expect it. The Cairo compiler is able to process implicit arguments only if you declare that you are going to use them. See here.

Okay, I eventually made it work, after stumbling onto gtk-rs: how to update view from another thread . The key is to stash window in a thread-local global (TBH I don't really understand what that means but it works), and then access it through a static function.

I had to modify the linked answer a bit because of scope disagreements between my channel and my window. Eventually I just decided to deal with them separately.

I strongly suspect this is not the right way to do this, but at least it runs.

I eventually figured out a way (asking Rust: Why can't I move a value twice? ) along the way. Describing what I learned:

• rx must be moved into a closure that uses it, if the closure might outlive the original scope in which rx was created. (This happens twice in the code in the question).
• This code has two nested closures, with rx created outside of each. You can "give" rx to the outer closure, but it cannot then give it to the inner one, because the outer one might be called repeatedly (for all rust knows). If it gives away its only copy, it might not have one for second calls, which would be unsafe.

My solution has been to define the connect_draw enclosure outside of the connect_activate closure. Note that this solution still isn't perfect as I haven't figure dout how to trigger connect_draw on a timer like a grown up, but the channel issue seems to be solved:

Your pre input data is Object data. { "value": 1 , "text": "Amsterdam" , "continent": "Europe" }

When you type in the input, it's String value, not Object type. In the case of having itemValue option in tagsinput, it doesn't accept String data. You can use onchange event to get the text you typed in and can add data what you are looking by using add method.

I wrote my example code for you here.

Here are some leading questions that can help you reach the answer. Answers to the questions after a break:

1. Where does the jmp rel -1 instruction jump to?
2. What does the target instruction do? What happens after it?
3. How did this instruction end up in the program section of the memory?

1. jmp rel -1 is encoded in the memory at addresses 5-6. When it is executed, we have pc = 5, thus after the jump we will execute the instruction at pc = 4, which is 0x48307fff7fff8000.
2. This bytecode encodes the instruction [ap] = [ap - 1] + [ap - 1]; ap++ (to check, you can manually decode the flags and offsets, or simply write a cairo program with this instruction and see what it compiles to). After it is executed, pc is increased by 1, so we again execute jmp rel -1, and so on in an infinite loop. It should be clear why this fills the memory with powers of 2 (the first 2, at address 10, was written by the [fp + 1] = 2; ap++ instruction).
3. The instruction [fp] = 5201798304953761792; ap++ has an immediate argument (the right hand side, 5201798304953761792). Instructions with immediate arguments are encoded as two field elements in the memory, the first encoding the general instruction (e.g. [fp] = imm; ap++), and the second being the immediate value itself. This immediate value is thus written in address 4, and indeed 5201798304953761792 is the same as 0x48307fff7fff8000. Similarly, the 2 at address 2 is the immediate argument of the instruction [fp + 1] = 2, and the -1 at address 6 is the immediate of jmp rel -1.

To summarize, this strange behavior is due to the relative jump moving to an address of an immediate value and parsing it as a standalone instruction. Normally this wouldn't occur, since pc is incremented by 2 after executing an instruction with an immediate value, and by 1 when executing an instruction without one, so it always continues to the next compiled instruction. The unlabeled jump was necessary here to reach this unexpected program counter.

Mimicking the C API closely means that functions take simple arguments. As an example, the move_to function/method looks like this:

Random guess: You need some CMake-equivalent for the following line (because you are using a static library for cairo):

quartz_deps = dependency('appleframeworks', modules : ['CoreFoundation', 'ApplicationServices'], required: get_option('quartz'))

https://gitlab.freedesktop.org/cairo/cairo/-/blob/master/meson.build#L452

Just from the name of the function, CFDataGetBytes sounds like it could belong to CoreFoundation.

Related StackOverflow answer seems to be https://stackoverflow.com/a/18330634/436275

Per the accepted answer of the question above, you can apparently also use find_library to "get" frameworks.

Try this:

Probably the most easy way is surprisingly to implement yourself the diffimg algorithm. Looking at the source of diffimg shows the comparison algoritm is about 20 lines of code: