jcgregorio 942262fcb5 First set of minimal docs for the new Markdown server, which will eventually replace https://sites.google.com/site/skiadocs/.

Design of the new Markdown server is documented here:

  https://github.com/google/skia-buildbot/blob/master/doc/README.md

  You can see the server up and running here: http://skiadocs.com:8000/

  This is *reed because it adds a new top level directory to the skia repo.

BUG=skia:

Review URL: https://codereview.chromium.org/835083003

2015-01-05 11:17:27 -08:00

1.5 KiB

Raw Blame History

Tips & FAQ

Tips and Tricks

Bitmap Subsetting

Taking a subset of a bitmap is effectively free - no pixels are copied or memory is allocated. This allows Skia to offer an API that typically operates on entire bitmaps; clients who want to operate on a subset of a bitmap can use the following pattern, here being used to magnify a portion of an image with drawBitmapNine():

SkBitmap subset;
bitmap.extractSubset(&subset, rect);
canvas->drawBitmapNine(subset, ...);

FAQ

Does Skia support HW acceleration?

There are two ways Skia can take advantage of HW.

Subclass SkCanvas

Since all drawing calls go through SkCanvas, those calls can be redirected to a different graphics API. SkGLCanvas has been written to direct its drawing calls to OpenGL. See src/gl/

Custom bottleneck routines

There are sets of bottleneck routines inside the blits of Skia that can be replace on a platform in order to take advantage of specific CPU features. One such example is the NEON SIMD instructions on ARM v7 devices. See src/opts/

Does Skia support Font hinting?

Skia has a built-in font cache, but it does not know how to actual render font files like TrueType? into its cache. For that it relies on the platform to supply an instance of SkScalerContext?. This is Skia's abstract interface for communicating with a font scaler engine. In src/ports you can see support files for FreeType?, Mac OS X, and Windows GDI font engines. Other font engines can easily be supported in a like manner.

1.5 KiB Raw Blame History