Re: [Lazarus] Alpha transparency on GTK2 widgetset
Yeah, the "proper" approach would be to make a Cairo-based gtk2devicecontext implementation and it might still be a valid goal, depending on how long the gtk3 interface will be in development (after all it took years for the gtk2 interface to become the default in Linux). Also i think that with gtk2 and gtk3 being incompatible, we'll see gtk2 to remain around for a while, especially in non-GNOME-based desktop environments (such as MATE, the GNOME2 fork, XFCE, etc). But for the short term, this solves some common issues. Some of the stuff mentioned in the related bugs seem to require a more solid conversion to Cairo since currently there is a lot of information "lost" with the conversions between pixmaps and pixbufs. On Sun, Jan 5, 2014 at 3:56 PM, Marc Weustink wrote: > Nice job. > I had a different approach in mind, but that required a rewrite of > gtk2devicecontext and a lot of cairo stuff. This effectively would be > similar to gtk3 and take a lot of time. > After some initial rewrites, life changed and my time became limited. At the > same time I heard rumors about a start of a gtk3 interface. So the interest > of changing gtk2 dropped. > I'm glad you wrote this patch. > > Marc > > > > > On 4-1-2014 19:22, Kostas Michalopoulos wrote: >> >> I've made a patch that fixes the common cases (drawing an image with >> an alpha channel with optional scaling and flipping). It can be >> downloaded here: >> >> http://bugs.freepascal.org/view.php?id=25491 >> >> Here is also an image showing what this fixes: >> >> http://i.imgur.com/FH8wbX0.png >> >> The test program (attached on the bug report) shows the toolbar, >> image/icon and generated bitmap with TLazIntfImage/TRawImage. The >> latter is drawn normally, stretched, flipped and both stretched and >> flipped (as a side note the flipping doesn't seem to work under >> Windows but the API seems to support it and the unpatched GTK2 also >> supported that, so this is probably a bug in the Win32 widgetset). >> >> Also the watches toolbar in Lazarus is shown before and after the >> patch (notice the jaggies and missing pixels in the unpatched >> version). >> >> >> On Sat, Jan 4, 2014 at 4:38 PM, Juha Manninen >> wrote: >>> >>> On Sat, Jan 4, 2014 at 5:20 PM, Kostas Michalopoulos >>> wrote: Looking in the code, I think i see the problem. [...] >>> >>> >>> Impressive. I still mostly don't understand GTK2 bindings code. >>> >>> For now i'm looking into trying to use the pixbuf when an image operation is requested and see if that helps for solving the most glaring issues with toolbars having no transparency and converting between tbitmap to tlazintfimage and back losing the alpha channel. It wont solve the issue of other operations (f.e. drawing a line, arc, rectangle, etc over an image with alpha channel), but that would require a complete rewrite of the GTK2 graphics context code to use Cairo (which will be necessary for GTK3 anyway). >>> >>> >>> A patch for GTK2 bindings would surely be welcome. >>> Do you know that GTK3 bindings also exist. They have a different >>> architecture than GTK2 bindings. >>> Zeljan has started them but they are in alpha state now. >>> Contributions are welcome there, too. >>> >>> Juha >>> >>> -- >>> ___ >>> Lazarus mailing list >>> Lazarus@lists.lazarus.freepascal.org >>> http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus >> >> >> -- >> ___ >> Lazarus mailing list >> Lazarus@lists.lazarus.freepascal.org >> http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus >> > > > -- > ___ > Lazarus mailing list > Lazarus@lists.lazarus.freepascal.org > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
Nice job. I had a different approach in mind, but that required a rewrite of gtk2devicecontext and a lot of cairo stuff. This effectively would be similar to gtk3 and take a lot of time. After some initial rewrites, life changed and my time became limited. At the same time I heard rumors about a start of a gtk3 interface. So the interest of changing gtk2 dropped. I'm glad you wrote this patch. Marc On 4-1-2014 19:22, Kostas Michalopoulos wrote: I've made a patch that fixes the common cases (drawing an image with an alpha channel with optional scaling and flipping). It can be downloaded here: http://bugs.freepascal.org/view.php?id=25491 Here is also an image showing what this fixes: http://i.imgur.com/FH8wbX0.png The test program (attached on the bug report) shows the toolbar, image/icon and generated bitmap with TLazIntfImage/TRawImage. The latter is drawn normally, stretched, flipped and both stretched and flipped (as a side note the flipping doesn't seem to work under Windows but the API seems to support it and the unpatched GTK2 also supported that, so this is probably a bug in the Win32 widgetset). Also the watches toolbar in Lazarus is shown before and after the patch (notice the jaggies and missing pixels in the unpatched version). On Sat, Jan 4, 2014 at 4:38 PM, Juha Manninen wrote: On Sat, Jan 4, 2014 at 5:20 PM, Kostas Michalopoulos wrote: Looking in the code, I think i see the problem. [...] Impressive. I still mostly don't understand GTK2 bindings code. For now i'm looking into trying to use the pixbuf when an image operation is requested and see if that helps for solving the most glaring issues with toolbars having no transparency and converting between tbitmap to tlazintfimage and back losing the alpha channel. It wont solve the issue of other operations (f.e. drawing a line, arc, rectangle, etc over an image with alpha channel), but that would require a complete rewrite of the GTK2 graphics context code to use Cairo (which will be necessary for GTK3 anyway). A patch for GTK2 bindings would surely be welcome. Do you know that GTK3 bindings also exist. They have a different architecture than GTK2 bindings. Zeljan has started them but they are in alpha state now. Contributions are welcome there, too. Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On 01/05/2014 02:47 AM, Bart wrote: On 1/5/14, Michael Fuchs wrote: Will this patch go into the upcoming 1.2 Version? If you want to make sure it is at least considered, then add it to the merge requests on http://wiki.lazarus.freepascal.org/Lazarus_1.2_fixes_branch Commiter should add it there (Juha in this case). zeljko -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On Sun, Jan 5, 2014 at 3:47 AM, Bart wrote: > On 1/5/14, Michael Fuchs wrote: > >> Will this patch go into the upcoming 1.2 Version? > > If you want to make sure it is at least considered, then add it to the > merge requests on > http://wiki.lazarus.freepascal.org/Lazarus_1.2_fixes_branch I added it there right after committing. Now Martin has apparently merged all pending commits there. This was good timing. Lazarus 1.2 RC2 will come after a week. It will be the last RC version and not many changes should be merged any more after it. I will see if I can fix some more issues targeted for 1.2 before that. This GTK2 transparency fix was a major improvement. It affects also the IDE itself and resolves many reports. Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On 1/5/14, Michael Fuchs wrote: > Will this patch go into the upcoming 1.2 Version? If you want to make sure it is at least considered, then add it to the merge requests on http://wiki.lazarus.freepascal.org/Lazarus_1.2_fixes_branch Bart -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
Am 04.01.2014 19:22, schrieb Kostas Michalopoulos: > I've made a patch that fixes the common cases (drawing an image with > an alpha channel with optional scaling and flipping). Wow, thank you very much for this patch. This bug was a steady annoyance. Will this patch go into the upcoming 1.2 Version? Michael -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On Sat, Jan 4, 2014 at 8:22 PM, Kostas Michalopoulos wrote: > I've made a patch that fixes the common cases (drawing an image with > an alpha channel with optional scaling and flipping). It works well and I applied it. Thanks! I also attached many related bug reports to yours. Could you and maybe other graphics programmers look at them. I plan to resolve them all if they actually are resolved. Earlier mainly Marc and Felipe have taken care of graphics but they are busy with other things. Your contribution was very much needed. Many people have reported about the transparency issues but nobody provided a patch until you. Juha P.S. I added you to the contributor list. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On 2014-01-04 18:22, Kostas Michalopoulos wrote: > Here is also an image showing what this fixes: > > http://i.imgur.com/FH8wbX0.png The results look very nice. :-) The LCL-GTK2 interface REALLY needed such a fix ages ago. Nicely done. Regards, - Graeme - -- fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal http://fpgui.sourceforge.net/ -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
I've made a patch that fixes the common cases (drawing an image with an alpha channel with optional scaling and flipping). It can be downloaded here: http://bugs.freepascal.org/view.php?id=25491 Here is also an image showing what this fixes: http://i.imgur.com/FH8wbX0.png The test program (attached on the bug report) shows the toolbar, image/icon and generated bitmap with TLazIntfImage/TRawImage. The latter is drawn normally, stretched, flipped and both stretched and flipped (as a side note the flipping doesn't seem to work under Windows but the API seems to support it and the unpatched GTK2 also supported that, so this is probably a bug in the Win32 widgetset). Also the watches toolbar in Lazarus is shown before and after the patch (notice the jaggies and missing pixels in the unpatched version). On Sat, Jan 4, 2014 at 4:38 PM, Juha Manninen wrote: > On Sat, Jan 4, 2014 at 5:20 PM, Kostas Michalopoulos > wrote: >> Looking in the code, I think i see the problem. >> [...] > > Impressive. I still mostly don't understand GTK2 bindings code. > > >> For now i'm looking into trying to use the pixbuf when an image >> operation is requested and see if that helps for solving the most >> glaring issues with toolbars having no transparency and converting >> between tbitmap to tlazintfimage and back losing the alpha channel. It >> wont solve the issue of other operations (f.e. drawing a line, arc, >> rectangle, etc over an image with alpha channel), but that would >> require a complete rewrite of the GTK2 graphics context code to use >> Cairo (which will be necessary for GTK3 anyway). > > A patch for GTK2 bindings would surely be welcome. > Do you know that GTK3 bindings also exist. They have a different > architecture than GTK2 bindings. > Zeljan has started them but they are in alpha state now. > Contributions are welcome there, too. > > Juha > > -- > ___ > Lazarus mailing list > Lazarus@lists.lazarus.freepascal.org > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On Sat, Jan 4, 2014 at 5:20 PM, Kostas Michalopoulos wrote: > Looking in the code, I think i see the problem. > [...] Impressive. I still mostly don't understand GTK2 bindings code. > For now i'm looking into trying to use the pixbuf when an image > operation is requested and see if that helps for solving the most > glaring issues with toolbars having no transparency and converting > between tbitmap to tlazintfimage and back losing the alpha channel. It > wont solve the issue of other operations (f.e. drawing a line, arc, > rectangle, etc over an image with alpha channel), but that would > require a complete rewrite of the GTK2 graphics context code to use > Cairo (which will be necessary for GTK3 anyway). A patch for GTK2 bindings would surely be welcome. Do you know that GTK3 bindings also exist. They have a different architecture than GTK2 bindings. Zeljan has started them but they are in alpha state now. Contributions are welcome there, too. Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
Looking in the code, I think i see the problem. The graphics operations for GTK2 use GDK drawables which do not support alpha blending. The bitmaps can be stored in 32bit pixbufs, but those are not drawables and when a graphics operation is needed (drawing to a canvas or blitting from one image to another), the graphics context contains a generated pixmap (which only holds RGB data) and a mask (which is 1bit). So all drawing operations are limited to 1bit transparency. However GDK does offer functionality for drawing pixbufs to drawables but it is incompatible with the rest of the GDK graphics operations (f.e. you can't draw an arc to a pixbuf so pixbufs cannot be used for everything). For now i'm looking into trying to use the pixbuf when an image operation is requested and see if that helps for solving the most glaring issues with toolbars having no transparency and converting between tbitmap to tlazintfimage and back losing the alpha channel. It wont solve the issue of other operations (f.e. drawing a line, arc, rectangle, etc over an image with alpha channel), but that would require a complete rewrite of the GTK2 graphics context code to use Cairo (which will be necessary for GTK3 anyway). On Sat, Jan 4, 2014 at 2:24 PM, Juha Manninen wrote: > On Sat, Jan 4, 2014 at 3:00 PM, Kostas Michalopoulos > wrote: >> What is the problem with (full) transparency in GTK2? > > I have no idea. > >> Is anyone working on this? > > Unfortunately not. There are only few people who know the GTK2 > bindings code. We would need more contributors for it. > > Right now I am going through Mantis issues with target 1.2. There are >> 270 of them. Uhhh! > Most of them must be postponed but maybe we can make it down to 250 before > that. > Anybody who is interested, please look at the issues. > Find the ones already fixed and provide patches for the ones that are > not. Thanks. :) > > Juha > > -- > ___ > Lazarus mailing list > Lazarus@lists.lazarus.freepascal.org > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Alpha transparency on GTK2 widgetset
On Sat, Jan 4, 2014 at 3:00 PM, Kostas Michalopoulos wrote: > What is the problem with (full) transparency in GTK2? I have no idea. > Is anyone working on this? Unfortunately not. There are only few people who know the GTK2 bindings code. We would need more contributors for it. Right now I am going through Mantis issues with target 1.2. There are > 270 of them. Uhhh! Most of them must be postponed but maybe we can make it down to 250 before that. Anybody who is interested, please look at the issues. Find the ones already fixed and provide patches for the ones that are not. Thanks. :) Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Alpha transparency on GTK2 widgetset
Hello, I have a problem with the GTK2 widgetset: it doesn't seem to support alpha channel. I'm using TLazIntfImage and related classes/objects (TRawImage) to load and display images (converting from/to custom bitmap structure to "native" structures so i can use them with canvas for drawing, adding them to imagelists for use with icon views, tree views, comboboxes, menus, etc). This works fine in Win32 and from a quick test it seems to work in Qt4 too, but for the latter i'd like to avoid it since i'm not using a Qt-based desktop myself and i prefer GTK+. Also i would like to avoid the qt4pas dependency. By looking around the bugtracker it seems that other people encounter the same issue - some bugreports are old, like Graeme's one about missing transparency from 2012. What is the problem with (full) transparency in GTK2? Is anyone working on this? Kostas -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
