Comments on: How to implement a basic bitmap brush http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/ making matt mullenweg regret his role as an enabler Thu, 24 Jul 2008 04:12:24 +0000 http://wordpress.org/?v=2.5 By: Robert Collins http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-36188 Robert Collins Thu, 10 Jul 2008 22:50:15 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-36188 Thanks a lot for sharing this ! Trying to code a little sketch program. Using a wacom for drawing I add modifications to handle tablet pressure for opacity (via NSEvent pressure) but I never found a way to handle smooth curve drawing (I mean drawing stamps along a curve interpolating between mouse locations) Thanks, Robert Thanks a lot for sharing this ! Trying to code a little sketch program.
Using a wacom for drawing I add modifications to handle tablet pressure for opacity (via NSEvent pressure) but I never found a way to handle smooth curve drawing (I mean drawing stamps along a curve interpolating between mouse locations)

Thanks,
Robert

]]> By: Pixeled http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-23402 Pixeled Tue, 04 Sep 2007 04:53:09 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-23402 > The past tense of ‘drag’ is ‘dragged’, not ‘drug’. bzzt. .thanks for playing. drug 2 [druhg] Pronunciation Key - Show IPA Pronunciation –verb Chiefly Midland and Southern U.S. Nonstandard. a pt. and pp. of drag. and who the hell comments (incorrectly) about grammar in a programming blog. get a fricken life. > The past tense of ‘drag’ is ‘dragged’, not ‘drug’.

bzzt. .thanks for playing.

drug 2 [druhg] Pronunciation Key - Show IPA Pronunciation
–verb Chiefly Midland and Southern U.S. Nonstandard.
a pt. and pp. of drag.

and who the hell comments (incorrectly) about grammar in a programming blog. get a fricken life.

]]> By: Pieter Omvlee http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-23282 Pieter Omvlee Sat, 01 Sep 2007 09:51:47 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-23282 Just when I was about to implement a brush in my own application... Perfect timing. A few things were new for me, thank you very much. Just when I was about to implement a brush in my own application…
Perfect timing.
A few things were new for me, thank you very much.

]]> By: Thomas C. http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-23004 Thomas C. Sat, 25 Aug 2007 01:34:40 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-23004 Very well done. Thank you for posting the link on the Quartz mailing list. Very well done. Thank you for posting the link on the Quartz mailing list.

]]> By: Andy http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22993 Andy Fri, 24 Aug 2007 19:19:25 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22993 > What is the difference between this implementation and using NSImage and the associated compositing methods? Probably not much. NSImage is probably heavier than a CGImageRef, but other than that, after creating the brush image, stamping is just compositing. The truth is I was already in CG land with the graphics and just decided to stay there (instead of switching to NSImage). However, I will point out that drawing the brush image into a CGLayerRef (instead of a CGBitmapContext), and then using the CGLayerRef to stamp would give a performance improvement over the current implementation. > What is the difference between this implementation and using NSImage and the associated compositing methods?

Probably not much. NSImage is probably heavier than a CGImageRef, but other than that, after creating the brush image, stamping is just compositing. The truth is I was already in CG land with the graphics and just decided to stay there (instead of switching to NSImage).

However, I will point out that drawing the brush image into a CGLayerRef (instead of a CGBitmapContext), and then using the CGLayerRef to stamp would give a performance improvement over the current implementation.

]]> By: Brian G. http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22969 Brian G. Fri, 24 Aug 2007 03:31:23 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22969 What is the difference between this implementation and using NSImage and the associated compositing methods? What is the difference between this implementation and using NSImage and the associated compositing methods?

]]> By: Michael Tsai - Blog - How to Implement a Basic Bitmap Brush http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22947 Michael Tsai - Blog - How to Implement a Basic Bitmap Brush Thu, 23 Aug 2007 14:20:25 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22947 [...] Andy Finnell: [...] […] Andy Finnell: […]

]]> By: sweetie http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22854 sweetie Tue, 21 Aug 2007 18:31:24 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22854 I think you tried to explain it to me, and I sat there and nodded dumbly for about thirty seconds before I realized I was waaaaaay out of my element. I'd always wanted to take a graphics class, and now I'm marrying someone who knows way more than I ever wanted to know. I think that's almost as good, don't you think? I know what you think of perl, but I'll stick to that. :) I think you tried to explain it to me, and I sat there and nodded dumbly for about thirty seconds before I realized I was waaaaaay out of my element.

I’d always wanted to take a graphics class, and now I’m marrying someone who knows way more than I ever wanted to know. I think that’s almost as good, don’t you think?

I know what you think of perl, but I’ll stick to that. :)

]]> By: Andy http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22813 Andy Mon, 20 Aug 2007 18:44:48 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22813 > Now how could one implement a paint bucket ? heh. That's actually the next thing I'm working on (sort of). I'm working on implementing a magic wand tool, which would use the same basic flood fill algorithm as a paint bucket. It's more in depth that a comment on a post could cover. I'm still investigating, but it looks like I'll have to drop down to manipulating the pixel data manually in order to implement it. This sort of makes sense because CoreGraphics doesn't really know about pixels, which is required to implement a flood fill algorithm. > Now how could one implement a paint bucket ?

heh. That’s actually the next thing I’m working on (sort of). I’m working on implementing a magic wand tool, which would use the same basic flood fill algorithm as a paint bucket. It’s more in depth that a comment on a post could cover.

I’m still investigating, but it looks like I’ll have to drop down to manipulating the pixel data manually in order to implement it. This sort of makes sense because CoreGraphics doesn’t really know about pixels, which is required to implement a flood fill algorithm.

]]> By: Andy http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22812 Andy Mon, 20 Aug 2007 18:38:46 +0000 http://www.losingfight.com/blog/2007/08/18/how-to-implement-a-basic-bitmap-brush/#comment-22812 > I think it’s worth pointing out that this kind of thing is far easier to do with a Quartz Composer view. I'm afraid I'm not all that familiar with Quartz Composer view. In what way would this be easier? > I think it’s worth pointing out that this kind of thing is far easier to do with a Quartz Composer view.

I’m afraid I’m not all that familiar with Quartz Composer view. In what way would this be easier?

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