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Re: GerbView GAL


although I am not a maintainer I took the liberty to test the code.
I am not sure if this is appropriate but since I am using kicad-master on a
daily basis a merge into master would directly affect me.

Just in case you do not already know there seem to be some issues with the
gerbview_gal branch:

1. Layer context menu entries "Hide all layers but active" and "Always hide
all layers but active" do not seem to work. All layers are initially hidden
and "always" is a NOP.
2. NPTH drills are not displayed correctly or no drills are displayed at

I have attached a zip file with two examples. Test1 is a NPTH drill file
that is not displayed correctly. Test2 files are not displayed at all
(black screen).
There a two screenshots for test1.

Tested under Linux with NVidia drivers.

 - Michael

Application: gerbview
Version: (2017-09-09 revision 61b588353)-gerbview_gal, release build
    wxWidgets 3.0.2
    libcurl/7.47.0 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.32 librtmp/2.3
Platform: Linux 4.10.0-33-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.58.0
    Curl: 7.47.0
    Compiler: GCC 5.4.0 with C++ ABI 1009

Build settings:

On Mon, Sep 11, 2017 at 9:26 PM, Jon Evans <jon@xxxxxxxxxxxxx> wrote:

> Thanks JP.
> For #2, it is a matter of the difference between OpenGL and Cairo
> implementation of transparency and occlusion in our GAL.  Cairo also has
> the issue that each draw item is composited with transparency, even on a
> single layer. (maybe that is what is wanted with transparent items
> sometimes, but it is an inconsistency between OpenGL and Cairo that needs
> to be resolved).
> I think one solution could be to interpret negative items at the geometry
> creation stage rather than at the rendering stage.  That is, if you have a
> negative item on a layer, do a boolean subtraction from the existing
> positive geometry.  Then just pass the resulting geometry to the GAL to
> draw, rather than trying to add support to GAL for drawing "subtractively"
> like was done in wxDC.
> -Jon
> On Mon, Sep 11, 2017 at 2:44 PM, jp charras <jp.charras@xxxxxxxxxx> wrote:
>> Le 10/09/2017 à 02:42, Jon Evans a écrit :
>> > Hi all,
>> >
>> > I've finally had time in the last few weeks to make more progress on
>> GerbView GAL.
>> >
>> > While it's not perfect, I think it is far enough along to propose
>> merging into the main repo, so
>> > that more people can start testing it and hopefully we can fix any bugs
>> and perhaps get more people
>> > working on the remaining features.
>> >
>> > There are two big missing features:
>> > 1) Printing (still uses the wx canvas)
>> > 2) Negative images
>> >
>> > The first one probably involves porting the print engine from wxDC to
>> Cairo, and the second one
>> > probably can be implemented by doing transformations of the negative
>> geometry into positive geometry
>> > for rendering (negative images are implemented using the wxDC
>> compositing mode which GAL doesn't
>> > support right now).
>> >
>> > Other than those things, everything I have tried is working (all of the
>> test files in the source
>> > tree and a number of my own boards).
>> >
>> > I'd like some input from the maintainers about whether or not this is
>> in an acceptable state to
>> > merge into master, and if not, what changes I should make first.  If
>> everything looks okay, I will
>> > format my branch into a series of patches and send to the list.
>> >
>> > You can view the source here:
>> > https://github.com/craftyjon/kicad/tree/gerbview_gal
>> > or clone
>> > git@xxxxxxxxxx:craftyjon/kicad.git
>> > and checkout gerbview_gal
>> >
>> > Best,
>> > Jon
>> Thanks Jon for all this (great) work.
>> I tested you branch and it is very acceptable to me.
>> And I know maintaining a branch during a long time when it has a lot of
>> changes is really not easy.
>> I saw a few (minor) issues, but nothing blocking. They can be fixed later.
>> My remarks:
>> * "1) Printing (still uses the wx canvas)":
>> This is also true for Pcbnew. this is not specific to Gerbview.
>> * I noticed negative objects are well drawn in Opengl canvas, but not in
>> Cairo canvas.
>> Just an idea: Gerbv uses Cairo canvas, so perhaps having a look at Gerbv
>> could help.
>> * "2) Negative images": I cannot not help you about that:
>> my knowledge of Opengl or Cairo is very basic.
>> Perhaps CERN guys can help you.
>> --
>> Jean-Pierre CHARRAS
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Attachment: gbView_1.zip
Description: Zip archive

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