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Fixed the rounding on some transform math. r=kmkclusky

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This commit is contained in:
dcone%netscape.com 1999-10-22 13:28:22 +00:00
parent ba38058bd1
commit df6c11149c
1 changed files with 11 additions and 5 deletions
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16
gfx/src/nsTransform2D.cpp
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@ -407,8 +407,11 @@ void nsTransform2D :: TransformCoord(nscoord *ptX, nscoord *ptY)
break;
case MG_2DSCALE | MG_2DTRANSLATION:
*ptX = NSToCoordRound(*ptX * m00 + m20);
*ptY = NSToCoordRound(*ptY * m11 + m21);
// You need to round the translation seperatly than the scale
// The translation is added into the matrix as pixels (after the scale
// multiply, so taking out the numbers requires it to be on pixel boundries
*ptX = NSToCoordRound(*ptX * m00) + NSToCoordRound(m20);
*ptY = NSToCoordRound(*ptY * m11) + NSToCoordRound(m21);
break;
default:
@ -521,8 +524,11 @@ void nsTransform2D :: TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth,
break;
case MG_2DSCALE | MG_2DTRANSLATION:
*aX = NSToCoordRound(*aX * m00 + m20);
*aY = NSToCoordRound(*aY * m11 + m21);
// You need to round the translation seperatly than the scale
// The translation is added into the matrix as pixels (after the scale
// multiply, so taking out the numbers requires it to be on pixel boundries
*aX = NSToCoordRound(*aX * m00) + NSToCoordRound(m20);
*aY = NSToCoordRound(*aY * m11) + NSToCoordRound(m21);
*aWidth = NSToCoordRound(*aWidth * m00);
*aHeight = NSToCoordRound(*aHeight * m11);
break;
@ -531,7 +537,7 @@ void nsTransform2D :: TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth,
case MG_2DGENERAL | MG_2DTRANSLATION:
x = (float)*aX;
y = (float)*aY;
*aX = NSToCoordRound(x * m00 + y * m10 + m20);
*aY = NSToCoordRound(x * m01 + y * m11 + m21);