[cl-gd-devel] Re: Drawing anti-aliased text with transparent background

[Andrei Stebakov]

Ah, it looks like make-anti-aliased is only for brushes, for drawing
lines... I wonder what technique works for the text?

Thanks!
Andrew

On 3/17/07, Andrei Stebakov <lispercat at gmail.com> wrote:
>
> I tred to use the (make-anti-aliased) function:
>     (draw-freetype-string 0 0
>                   text
>                   :anti-aliased t
>                   :font-name font
>                   :angle 0
>                   :point-size font-size
>                   :color (make-anti-aliased (allocate-color 0 0 255)))
>
> But the lisp gives me the error:
>
> The value of CL-GD::COLOR is #S(CL-GD::ANTI-ALIASED-COLOR
>                                   :COLOR 255
>                                   :DO-NOT-BLEND NIL), which is not of type
> INTEGER.
>    [Condition of type SIMPLE-TYPE-ERROR]
>
> Restarts:
>  0: [STORE-VALUE] Supply a new value of CL-GD::COLOR.
>  1: [ABORT] Return to SLIME's top level.
>  2: [ABORT] Return to Top-Level.
>
> Backtrace:
>   0: (LISP::CHECK-TYPE-ERROR CL-GD::COLOR
>                              #S(CL-GD::ANTI-ALIASED-COLOR
>                                   :COLOR 255
>                                   :DO-NOT-BLEND NIL)
>                              INTEGER
>                              NIL)
>
> Thank you,
> Andrew
>
> On 3/17/07, Andrei Stebakov < lispercat at gmail.com> wrote:
> >
> > Here is what I've got:
> > http://www.greenpixeldesign.com/cphandler/tmp-img/test.png
> > I'd like to remove the black outline from the anti-aliased text (I need
> > RGB true color image). I know I am missing some stupid thing, but I
> > experimented with different backgrounds, just doesn't make it right. My
> > current setup is gdlib 2.0.33 on debian, and here is the code;
> >
> > (defun create-text-image (text font font-size file-name)
> >   (multiple-value-bind (width height horizont-shift vertical-shift)
> >       (get-bounding-rect text font font-size)
> >     (with-image* (width height t)
> >       (let* ((white (allocate-color 255 255 255))
> >          (black (allocate-color 0 0 0))
> >          (red (allocate-color 255 0 0))
> >          (green (allocate-color 0 255 0))
> >          (blue (allocate-color 0 0 255)))
> >     (setf (transparent-color) black)
> >     (draw-freetype-string (- 0 horizont-shift) (- height vertical-shift)
> >
> >                   text
> >                   :anti-aliased t
> >                   :font-name font
> >                   :angle 0
> >                   :point-size font-size
> >                   :color (allocate-color 0 0 255))
> >
> >     ;;(true-color-to-palette)
> >     (write-image-to-file file-name :if-exists :supersede)))))
> >
>
>
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