diff options
Diffstat (limited to 'vendor/github.com/golang/freetype/truetype/hint.go')
| -rw-r--r-- | vendor/github.com/golang/freetype/truetype/hint.go | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/vendor/github.com/golang/freetype/truetype/hint.go b/vendor/github.com/golang/freetype/truetype/hint.go index 0315de511..13f785bc3 100644 --- a/vendor/github.com/golang/freetype/truetype/hint.go +++ b/vendor/github.com/golang/freetype/truetype/hint.go @@ -341,7 +341,14 @@ func (h *hinter) run(program []byte, pCurrent, pUnhinted, pInFontUnits []Point, case opSLOOP: top-- - if h.stack[top] <= 0 { + // https://developer.apple.com/fonts/TrueType-Reference-Manual/RM05/Chap5.html#SLOOP + // says that "Setting the loop variable to zero is an error". In + // theory, the inequality on the next line should be "<=" instead + // of "<". In practice, some font files' bytecode, such as the '2' + // glyph in the DejaVuSansMono.ttf that comes with Ubuntu 14.04, + // issue SLOOP with a zero on top of the stack. Just like the C + // Freetype code, we allow the zero. + if h.stack[top] < 0 { return errors.New("truetype: hinting: invalid data") } h.gs.loop = h.stack[top] |