RE: [ft] FreeType artefact

2007-10-09 Thread Buu Hao Tran
, October 05, 2007 2:09 PM To: Dave Williss Cc: freetype@nongnu.org Subject: Re: [ft] FreeType artefact there is no best value to distribute, because ideally, the opacity levels given in a FreeType pixmap must be interpreted as linear color space coefficients. which means that the distribution depends

Re: [ft] FreeType artefact

2007-10-05 Thread David Turner
there is no best value to distribute, because ideally, the opacity levels given in a FreeType pixmap must be interpreted as linear color space coefficients. which means that the distribution depends on the background and text colors you're going to use. To be more precise to do gamma-correct

Re: [ft] FreeType artefact

2007-09-28 Thread Dave Williss
That brings up a good question. It's been a while since I poked around in our code that uses FreeType, but as I recall, we render to grayscale bitmaps and use the gray levels as an alpha value to combine the requested color with the existing image. I've never been 100% happy with the way it

Re: [ft] FreeType artefact

2007-09-28 Thread Werner LEMBERG
I uploaded new image, so maybe it's easier to diagnose: http://66.232.119.162/img/fontbug.PNG Artefact appear only if draw text over background. If white background then no problems. Aah, we are getting nearer. It seems that the algorithm you use to draw on a coloured background needs some

Re: [ft] FreeType artefact

2007-09-27 Thread Werner LEMBERG
I call 2 functions to draw text: [...] For detailed studying I need something which compiles out of the box, and which doesn't use a graphics system. Please use the `example1.c' file from the FreeType tutorial as a template. Werner ___

[ft] FreeType artefact

2007-09-25 Thread Buu Hao Tran
Hi, I use FreeType in my application (Windows XP). It seems to work well at begining, but after few minutes of using the software text become very low quality. You can see bad and good text here: http://66.232.119.162/img/fontbug.PNG Please advice what's wrong? Same code produce different text

Re: [ft] FreeType artefact

2007-09-25 Thread Werner LEMBERG
I use FreeType in my application (Windows XP). It seems to work well at begining, but after few minutes of using the software text become very low quality. You can see bad and good text here: http://66.232.119.162/img/fontbug.PNG Please advice what's wrong? Same code produce different text

Re: [ft] FreeType artefact

2007-09-25 Thread Dave Williss
It looks to me like the text was rendered at the smaller size and then later zoomed up using a nearest-neighbor algorithm. I would look at the rescaling of the bitmap. Buu Hao Tran wrote: Hi, I use FreeType in my application (Windows XP). It seems to work well at begining, but after few