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win32: Explain the purpose of the surface extents

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It wasn't immediately obvious to me what the purpose of having
extents instead of just a size was.
This commit is contained in:
Jeff Muizelaar 2011-04-21 17:53:21 -04:00
parent 9f92901b09
commit bf75c9542d
1 changed files with 9 additions and 0 deletions
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src/cairo-win32-private.h
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@ -72,6 +72,15 @@ typedef struct _cairo_win32_surface {
cairo_surface_t *image;
/* We use the x and y parts of extents for situations where
* we're not supposed to draw to the entire surface.
* For example, during a paint event a program will get
* a DC that has been clipped to the dirty region.
* A cairo surface constructed for that DC will have extents
* that match bounds of the clipped region.
*
* jrmuizel: I'm not sure if storing these extents instead
* of just using the size is better... */
cairo_rectangle_int_t extents;
/* Initial clip bits