Support for OpenType Font Variations on Windows

Enable support for variable fonts on Windows through using
SkFontMgr_Custom_Empty, a FreeType backed font-blob only SkTypeface
factory (no access to system fonts). We will use a hybrid DirectWrite
and FreeType font stack on Windows for at least as long as most of
Windows versions we support with Chrome still do not have native support
for font variations.

Thanks to Ben Wagner for the help with enabling and prototyping this.

BUG=700926

Review-Url: https://codereview.chromium.org/2780133002
Cr-Original-Commit-Position: refs/heads/master@{#460895}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5265e65e5ea1ae3987c27f76914c9dd9a41506cd
1 file changed
tree: 27a3ab1daa70d8b5997ee7aacc41d1290a6b5ebd
  1. build.gni
  2. gtest.gni
  3. OWNERS
  4. pdfium.gni
  5. README.md
  6. webrtc.gni
README.md

Build overrides in GN

This directory is used to allow different products to customize settings for repos that are DEPS'ed in or shared.

For example: V8 could be built on its own (in a “standalone” configuration), and it could be built as part of Chromium. V8 might define a top-level target, //v8:d8 (a simple executable), that should only be built in the standalone configuration. To figure out whether or not it should be in a standalone configuration, v8 can create a file, build_overrides/v8.gni, that contains a variable, build_standalone_d8 = true. and import it (as import(“//build_overrides/v8.gni”) from its top-level BUILD.gn file.

Chromium, on the other hand, might not need to build d8, and so it would create its own build_overrides/v8.gni file, and in it set build_standalone_d8 = false.

The two files should define the same set of variables, but the values can vary as appropriate to the needs of the two different builds.

The build.gni file provides a way for projects to override defaults for variables used in //build itself (which we want to be shareable between projects).

TODO(crbug.com/588513): Ideally //build_overrides and, in particular, //build_overrides/build.gni should go away completely in favor of some mechanism that can re-use other required files like //.gn, so that we don't have to keep requiring projects to create a bunch of different files to use GN.