On 4 March 2013 23:41, Kolja Lubitz <pinguin...@gmail.com> wrote: > Hi
Hi Kolja, > I'm thinking for a while about adding some kind of vector support to > MaPaint. The main idea is a Paint program in which you don't have to care > about pixel. > > The main workflow should be open the program and you start with a white > surface and then you can start painting and only in the end if you press > save you decide in witch resolution you like to have your pic. > > On the technical side it is very simple. While painting we need to store all > input data and scale and brush. And on save the brushes will be rendering to > a png or so. I agree with your vision, users should not have to care about pixels most of the time. MyPaint already stores most of the input data. Check out the classes with names like Stroke in lib/stroke.py etc. At the moment it is used for the "change last stroke" feature that one can toggle on/off in the brush settings editor, and probably for the bezier curve lines. Previously it was used for undo/redo as well, but that was found to be too slow. That is probably going to be the main challenge: performance. In the traditional raster model, where one destructively update a set of tiled mipmapped raster surfaces as changes are made, rendering the document to screen or to a bitmap export is very fast as it only requires compositing the layers together (at the appropriate mipmap level) and blitting it to the screen/bitmap. I am not sure how to efficiently represent a document of MyPaint brush strokes as vector data that can be rendered as fast. To try out the idea, and as a first useful step, you could try to implement a "lossless resize document" feature? Use the existing stroke infrastructure to store all input information (probably needs some additions as well), and when invoking this function the user can choose to make the document say 2x bigger or smaller. MyPaint should then replay all the strokes onto different size surfaces, and the result should be as if one had been painting at that resolution all the time. That should give you a feeling for how feasible it would be performance wise, and let you understand how such things can be done inside the MyPaint code. -- Jon Nordby - www.jonnor.com _______________________________________________ Mypaint-discuss mailing list Mypaint-discuss@gna.org https://mail.gna.org/listinfo/mypaint-discuss
