Add FontMgr to DirectWrite.

Add FontMgr to DirectWrite.

[bungeman-skia, 2013-04-26 19:48:28]

Adds a FontMgr implementation for DirectWrite. The SkTDArray.h changes are under
separate review at https://codereview.chromium.org/14502003/ . Including here to
demonstrate how it is being used.

[reed1, 2013-04-26 20:37:41]

lets try to land the SkTDArray change (plus some unittests) separately.

[bungeman-skia, 2013-04-29 21:44:34]

Patch Set 3 just moves to using a modified SkAutoSTMalloc instead of a new
SkSTDArray. This makes this change much simpler.

The change to SkAutoSTMalloc (get() returns NULL when the request is for 0) is
justified as malloc may return NULL (or some other value which can safely be
passed to free) when the requested size is 0. In any event, such a pointer
should never be dereferenced, and defining it to be NULL here makes my life
easier.

[bungeman-skia, 2013-04-29 22:59:06]

https://codereview.chromium.org/14314008/diff/12001/src/gpu/gl/GrGLCaps.cpp
File src/gpu/gl/GrGLCaps.cpp (right):

https://codereview.chromium.org/14314008/diff/12001/src/gpu/gl/GrGLCaps.cpp#n...
src/gpu/gl/GrGLCaps.cpp:222: if (numFormats) {
The 'debug' gl context sets numFormats to 0.

https://codereview.chromium.org/14314008/diff/12001/src/gpu/gl/GrGLCaps.cpp#n...
src/gpu/gl/GrGLCaps.cpp:223: SkAutoSTMalloc<10, GrGLint> formats(numFormats);
The new SkAutoSTMalloc fPtr is NULL when constructed with a count of 0.

https://codereview.chromium.org/14314008/diff/12001/src/gpu/gl/GrGLCaps.cpp#n...
src/gpu/gl/GrGLCaps.cpp:224: GR_GL_GetIntegerv(gli,
GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
The first thing GR_GL_GetIntegerv does is

*formats = 0

Which is an iffy thing to do when one has zero formats.

[bungeman-skia, 2013-04-30 17:02:36]

Adding bsalomon for the change to GrGLCaps.cpp.

I've reviewed existing uses of SkAutoSTMalloc, and aside from GrGLCaps.cpp which
is fixed here and discovering an issue with pdf (see
https://code.google.com/p/skia/issues/detail?id=1271 ) this looks good.

[reed1, 2013-04-30 20:00:35]

lgtm

[bsalomon, 2013-04-30 20:03:02]

On 2013/04/30 20:00:35, reed1 wrote:
> lgtm

lgtm

[bungeman-skia, 2013-05-01 14:22:25]

Committed revision 8934.