Support multiple scales for dfpaths.

Support multiple scales for dfpaths.

Adds miplevel as part of dfpath key, and scale factor so we know
how much to adjust to fit desired scale.

BUG=skia:2935
Committed: https://skia.googlesource.com/skia/+/b61283f9c7cbec4236d6ce6ce9d0376d3dd81207

[jvanverth1, 2014-10-29 18:32:03]

jvanverth@google.com changed reviewers:
+ robertphillips@google.com

[robertphillips, 2014-10-29 19:55:03]

lgtm + some dox suggestions

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
File src/gpu/GrAADistanceFieldPathRenderer.cpp (right):

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
src/gpu/GrAADistanceFieldPathRenderer.cpp:24: #define PLOT_WIDTH  256
Double plot height too ?

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
src/gpu/GrAADistanceFieldPathRenderer.cpp:87: // only support paths smaller than
64x64, scaled to less than 256x256
// The goal is to accelerate rendering of lots of small paths that may be
scaling.

?

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
File src/gpu/GrAADistanceFieldPathRenderer.h (right):

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
src/gpu/GrAADistanceFieldPathRenderer.h:45: uint32_t   fGenID;
// fMipLevel is the scaling applied to this path when it was generated. This
determines the range for which it can be used to draw.

?

[jvanverth1, 2014-10-30 12:48:29]

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
File src/gpu/GrAADistanceFieldPathRenderer.cpp (right):

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
src/gpu/GrAADistanceFieldPathRenderer.cpp:24: #define PLOT_WIDTH  256
On 2014/10/29 19:55:02, robertphillips wrote:
> Double plot height too ?

No, they can stay 256x256. I'm just trying to double the number of plots.

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
src/gpu/GrAADistanceFieldPathRenderer.cpp:87: // only support paths smaller than
64x64, scaled to less than 256x256
On 2014/10/29 19:55:02, robertphillips wrote:
> // The goal is to accelerate rendering of lots of small paths that may be
> scaling.
> 
> ?

Done.

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
File src/gpu/GrAADistanceFieldPathRenderer.h (right):

https://codereview.chromium.org/687283002/diff/20001/src/gpu/GrAADistanceFiel...
src/gpu/GrAADistanceFieldPathRenderer.h:45: uint32_t   fGenID;
On 2014/10/29 19:55:02, robertphillips wrote:
> // fMipLevel is the scaling applied to this path when it was generated. This
> determines the range for which it can be used to draw.
> 
> ?

Done.

[jvanverth1, 2014-10-30 12:48:38]

The CQ bit was checked by jvanverth@google.com

[commit-bot: I haz the power, 2014-10-30 12:49:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/687283002/40001

[commit-bot: I haz the power, 2014-10-30 12:57:25]

Committed patchset #3 (id:40001) as b61283f9c7cbec4236d6ce6ce9d0376d3dd81207