AuroraMiddleware/skia2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
8fe24272fa
skia2/site/user/api/index.md
Mike Reed 36015ab796 remove SkXfermode from api dox -- it is gone 
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=16868
Bug: skia:1312
Change-Id: I28aafb80bcad0f3a810ca0b08caa15b70707b4a1
Reviewed-on: https://skia-review.googlesource.com/16868
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2017-05-15 14:24:02 +00:00

7.4 KiB
Raw Blame History

API Overview & Doxygen Docs

Skia is organized around the SkCanvas object. It is the host for the "draw" calls: drawRect, drawPath, drawText, etc. Each of these has two components: the primitive being drawn (SkRect, SkPath, etc.) and color/style attributes (SkPaint).

canvas->drawRect(rect, paint);

The paint holds much of the state describing how the rectangle (in this case) is drawn: what color it is, if it is filled or stroked, how it should blend with what was previously drawn.

The canvas holds relatively little state. It points to the actual pixels being drawn, and it maintains a stack of matrices and clips. Thus in the above call, the canvas' current matrix may transform the coordinates of the rectangle (translation, rotation, skewing, perspective), and the canvas' current clip may restrict where on the canvas the rectangle will be drawn, but all other stylistic attributes of the drawing are controlled by the paint.

Using the SkCanvas API:

  1. SkCanvas - the drawing context.
  2. SkPaint - color, stroke, font, effects
  3. SkRect - rectangles
  4. SkRegion - set operations with rectangles and paths

Appendix:

  1. Creating SkCanvas Objects

Autogenerated Doxygen Documentaion

Here's a partial list of the more important Skia classes: