I am using the DrawRescaled method of DrawBuf[1] of DLangUI To draw a PNG image to a CanvasWidget[2] subclass. It has a minor issue of the box bounds showing in area that shoud be transparent but otherwise works well.

My question is, does anybody know a way to draw that image backwards without making another PNG file to do so? I tried to pass a dstrect with negative width but that results in nothing being drawn.

1: http://buggins.github.io/dlangui/ddox/dlangui/graphics/drawbuf/DrawBuf.html
2: http://buggins.github.io/dlangui/ddox/dlangui/widgets/controls/CanvasWidget.html

On Tuesday, 21 November 2017 at 13:45:31 UTC, Dukc wrote:
> I am using the DrawRescaled method of DrawBuf[1] of DLangUI To draw a PNG image to a CanvasWidget[2] subclass. It has a minor issue of the box bounds showing in area that shoud be transparent but otherwise works well.
>
> My question is, does anybody know a way to draw that image backwards without making another PNG file to do so? I tried to pass a dstrect with negative width but that results in nothing being drawn.
>
> 1: http://buggins.github.io/dlangui/ddox/dlangui/graphics/drawbuf/DrawBuf.html
> 2: http://buggins.github.io/dlangui/ddox/dlangui/widgets/controls/CanvasWidget.html

There is no such feature currently, but it can be added easy.

On Thursday, 23 November 2017 at 13:31:23 UTC, Vadim Lopatin wrote:
>
> There is no such feature currently, but it can be added easy.

In the meantime I should call OpenGL (I think it's the backend in my case) directly, correct?

On Tuesday, 21 November 2017 at 13:45:31 UTC, Dukc wrote:
> My question is, does anybody know a way to draw that image backwards without making another PNG file to do so?

After a lot of code research, I believe the best way for me is to use DlangUI helpers in same way as in the new api of the opengl example[1], instead of using canvas and abstract drawable buffers. If I use orthogonal drawing instead of perspective, it should work for 2d icons as well as 3d. I still have to figure out how to use multiple textures in the same program through.

1: https://github.com/buggins/dlangui/tree/master/examples/opengl