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Bug 820061 - Clamp layer scale factors to inverse powers of 2 as well. r=roc

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This commit is contained in:
Matt Woodrow 2012-12-17 17:30:51 +13:00
parent 45eaffd444
commit aac3d85f58
1 changed files with 13 additions and 1 deletions
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14
gfx/thebes/gfxUtils.cpp
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@ -555,6 +555,12 @@ gfxUtils::ClampToScaleFactor(gfxFloat aVal)
aVal = -aVal;
}
bool inverse = false;
if (aVal < 1.0) {
inverse = true;
aVal = 1 / aVal;
}
gfxFloat power = log(aVal)/log(kScaleResolution);
// If power is within 1e-6 of an integer, round to nearest to
@ -562,13 +568,19 @@ gfxUtils::ClampToScaleFactor(gfxFloat aVal)
// next integer value.
if (fabs(power - NS_round(power)) < 1e-6) {
power = NS_round(power);
} else if (inverse) {
power = floor(power);
} else {
power = ceil(power);
}
gfxFloat scale = pow(kScaleResolution, power);
return NS_MAX(scale, 1.0);
if (inverse) {
scale = 1 / scale;
}
return scale;
}