This is in anticipation of caching glyph images. Quantization means that cache
hits are more likely.

Also make NewFace take an *Options instead of an Options.

benchmark                 old ns/op     new ns/op     delta
BenchmarkDrawString-4     96914389      88683659      -8.49%

benchmark                 old allocs     new allocs     delta
BenchmarkDrawString-4     32287          0              -100.00%

benchmark                 old bytes     new bytes     delta
BenchmarkDrawString-4     1929619       156           -99.99%

These comments weren't updated when we went from 24.8 to 26.6.

Its implementation is mostly a copy/paste of the freetype.Context type.
Follow-up commits will make it more efficient.

Also add an example that uses a truetype.Face and the
golang.org/x/exp/shiny/font package to draw text.

This is in anticipation of removing the f26dot6 type entirely. Instead,
we will use the fixed.Int26_6 type from golang.org/x/image/math/fixed.

This is in anticipation of removing the Point type entirely. Instead, we will
use the fixed.Point26_6 type from golang.org/x/image/math/fixed.

We use git and github now, not hg and code.google.com.

Fixes issue 16.

LGTM=crawshaw
R=crawshaw
CC=golang-codereviews, philipz
https://codereview.appspot.com/209280043

This code dates from before Go 1.0.

LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://codereview.appspot.com/206860043

of standard fonts like Deja Vu Sans Oblique.

LGTM=bsiegert
R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/164660043

Fixes issue 12.
Fixes issue 13.

LGTM=bsiegert
R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/164650043

LGTM=bsiegert
R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/60380043

hide the Hinter implementation in the freetype/truetype package.

LGTM=bsiegert
R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/58940043

LGTM=bsiegert
R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/54730043

Also delete "q means that that opcode is not yet implemented", as all
valid opcodes are now implemented.

R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/53050044

R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/51760043

The logic is a little clunky, but as before, let's get it right first,
then get it clean once we have a full battery of tests.

R=bsiegert
CC=golang-codereviews
https://codereview.appspot.com/50910043

R=bsiegert
CC=golang-codereviews, remyoudompheng
https://codereview.appspot.com/39440045

See this thread for background:
https://groups.google.com/forum/#!topic/golang-dev/xG7vPi21r8g

R=golang-codereviews, r
CC=golang-codereviews
https://codereview.appspot.com/36380046

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/40690045

rounding.

Pass all the hinting tests. Hooray! Removing the hintingBrokenAt field
will be a follow-up CL.

R=bsiegert, remyoudompheng, jeremyjackins
CC=golang-dev
https://codereview.appspot.com/36880043

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/36300043

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/36220043

The very subtle pp1x versus phantomPoints[0].X distinction is pretty
ugly code, but let's get all the tests passing first, so that we can
refactor with confidence.

R=bsiegert
CC=golang-dev, remyoudompheng
https://codereview.appspot.com/35850043