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freetype/truetype: fix IP rounding for negative numbers.

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Found in Adobe Source Sans Pro.

R=golang-dev, bsiegert, nigeltao
CC=golang-dev
https://codereview.appspot.com/15360043

Committer: Nigel Tao <nigeltao@golang.org>
This commit is contained in:
R?my Oudompheng 2013-10-22 17:13:52 +11:00
parent 3d51db0e38
commit e1f638ef1d
1 changed files with 11 additions and 3 deletions
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14
freetype/truetype/hint.go
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@ -472,7 +472,9 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
p = h.point(1, current, h.gs.rp[2])
curP := h.point(0, current, h.gs.rp[1])
curRange := dotProduct(f26dot6(p.X-curP.X), f26dot6(p.Y-curP.Y), h.gs.pv)
if oldRange < 0 {
oldRange, curRange = -oldRange, -curRange
}
for ; h.gs.loop != 0; h.gs.loop-- {
top--
i := h.stack[top]
@ -483,8 +485,14 @@ func (h *Hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point,
newDist := f26dot6(0)
if oldDist != 0 {
if oldRange != 0 {
newDist = f26dot6(
(int64(oldDist)*int64(curRange) + int64(oldRange/2)) / int64(oldRange))
// Compute and round oldDist * curRange / oldRange.
x := int64(oldDist) * int64(curRange)
if x < 0 {
x -= int64(oldRange) / 2
} else {
x += int64(oldRange) / 2
}
newDist = f26dot6(x / int64(oldRange))
} else {
newDist = -oldDist
}