simple display (from: GUI library for D)

[Jacob Carlborg]

On 2011-04-10 23:39, KennyTM~ wrote:
> On Apr 9, 11 04:26, Adam D. Ruppe wrote:
>> We discussed this first in the GUI library thread, but since it
>> meandered so much, I decided to split off into a new subject. Much
>> of what I say here will be old to anyone who saw the previous thread.
>> There's some new stuff nearer to the bottom though.
>>
>> I, with input from others, have started writing a little module
>> for simple uses of a display. You can write to a bitmap, display it
>> to a window, and handle events all in an easy way. The basics are
>> cross platform, but you can use native function calls too.
>>
>> http://arsdnet.net/dcode/simpledisplay.d
>>
>> It's still very much in progress, but I think it's now at the point
>> where the direction I'm taking it is clear.
>>
> [snip]
>
> Thanks for the great work!
>
> Taking the version on that link, I have ported it to use the native
> Cocoa/Core Graphics in OS X, instead of X11. You can check out the diff
> in https://github.com/kennytm/simpledisplay.d/commit/a790.

When using objc_msgSend and friends you need to cast the function to the 
right signature, to the same signature as the method you're calling via 
objc_msgSend, before calling it. See 
http://www.dsource.org/projects/dstep/browser/dstep/objc/message.d#L74

If you start passing floats to objc_msgSend you'll soon notice that you 
get some weird behaviors if you don't cast it to the right signature.

You also need to use different versions of objc_msgSend depending on 
what the return type is and on that platform you're on. If you're 
returning a struct or an floating point number of some kind you need to 
use a different version of objc_msgSend. You can have a look at: 
http://www.dsource.org/projects/dstep/browser/dstep/objc/bridge/Bridge.d#L779 
. Also look the function being called: 
http://www.dsource.org/projects/dstep/browser/dstep/objc/message.d

> Only Snow Leopard (10.6) is supported.
>
> I have only tested that it works on the pendulum example and the HSL
> picker, so things like drawText and drawPixel may not work properly yet.
> The implementation part is quite messy right now due to Objective-C.
>
> Since dmd does not have "pragma(framework)", you'll need to supply the
> "-L-framework -LAppKit" options to dmd to link it.
>
> And a few things:
>
> 1. *Please use spaces instead of tabs.*
> 2. Color's constructor's arguments should better be "red" "green" "blue"
> "alpha" rather than "a" "b" "c" "d".
> 3. The unit of "pulseTimeout" should be documented (milliseconds).
> 4. In the function "fromHsl", there is a (h is real.nan). However, 'is'
> on primitives is reduced to '==' and (nan == nan) is false, so (h is
> real.nan) will always be false. You should use std.math.isNaN().
> 5. Why use the ANSI version (LoadIconA, etc.), not the Unicode version
> (LoadIconW, etc.) of API on Windows? I think the latter is preferred.


-- 
/Jacob Carlborg