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TAChart: Fix false colors in TManhattanSeries. Issue #38759.

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git-svn-id: trunk@65002 -
This commit is contained in:
wp 2021-04-15 21:12:07 +00:00
parent 0a2e80cbc4
commit 87b1cb08ba
1 changed files with 20 additions and 3 deletions
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23
components/tachart/taseries.pas
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@ -917,10 +917,27 @@ var
rawImage: TRawImage;
r: TRect;
procedure PutPixel(const APoint: TPoint; AColor: TChartColor); inline;
{ Fix for issue #38759:
In TColor, the byte layout is - from low to high - "rgba". The rawimage
data block however must have the byte order "bgra". Therefore, we must
exchange r and b to avoid false colors.
Note: It does not work out to init the rawimage by Init_BPP32_R8G8B8A8_BIO_TTB
(rather than by Init_BPP32_B8G8R8A8_BIO_TTB) - no idea why... }
function FixColor(AColor: TChartColor): Cardinal; inline;
type
TQuad = packed array[0..3] of byte;
var
quad: TQuad absolute AColor;
begin
PCardinal(rawImage.Data)[APoint.Y * r.Right + APoint.X] :=
Cardinal(ColorDef(AColor, SeriesColor)) or $FF000000; // Opacity.
TQuad(Result)[0] := quad[2];
TQuad(Result)[1] := quad[1];
TQuad(Result)[2] := quad[0];
TQuad(Result)[3] := $FF; // Opacity
end;
procedure PutPixel(const APoint: TPoint; AColor: TChartColor);
begin
PCardinal(rawImage.Data)[APoint.Y * r.Right + APoint.X] := FixColor(ColorDef(AColor, SeriesColor));
cnt += 1;
end;