[Lazarus] TFPImageCanvas and TFreeTypeFont colors

Leonardo M. Ramé l.rame at griensu.com
Fri May 10 21:59:32 CEST 2013

On 2013-05-10 21:53:21 +0200, Michael Van Canneyt wrote:
> On Fri, 10 May 2013, Leonardo M. Ramé wrote:
> >On 2013-05-10 21:29:48 +0200, Michael Van Canneyt wrote:
> >>
> >>Can you produce a bitmap with just the text and see what that looks like ?
> >>
> >
> >I've tried that, and the result is the same.
> Well. Normally TFPImage does not perform any transformation on the
> bitmaps that the freetype engine produces: it just copies the result
> to the bitmap it is treating. So if that bitmap is empty, you get
> what FreeType produced.
> So this is rather strange to hear. Unfortunately, I do not know what to advise, except debugging :(

Well, maybe this can help. The background image is created from an RGBA
8bit pixel array, assigned to a TFPMemoryImage this way:

FCanvasImage.Colors[lXPos, lYPos] :=
    lBlue shl 8 + lBlue,
    lGreen shl 8 + lGreen,
    lRed shl 8 + lRed,
    $ff shl 8 + $ff);

lRed, lGreen and lBlue are of type byte, while FPColor needs word,
that's why I have to do the calcs. Maybe the calcs are wrong.

Leonardo M. Ramé

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