[cairo] Solid pattern caching revisited

[Chris Wilson]

A quick before/after count of X11 requests during cairo-perf:
CORE unknown                         12 12
CORE GetProperty                     12 12
CORE GetInputFocus                   15 24
CORE CreatePixmap                 78490 54410
CORE FreePixmap                   78490 54410
CORE CreateGC                     37142 36
CORE FreeGC                       37142 36
CORE CopyArea                       252 252
CORE PutImage                     38388 38388
CORE GetImage                      9368 9368
CORE QueryExtension                  36 36
RENDER RenderQueryVersion            12 12
RENDER RenderQueryPictFormats        12 12
RENDER RenderCreatePicture       119839 71679
RENDER RenderChangePicture       102732 28
RENDER RenderFreePicture         119839 71679
RENDER RenderComposite            50820 50820
RENDER RenderTrapezoids            2520 2520
RENDER RenderCreateGlyphSet           3 3
RENDER RenderFreeGlyphSet             3 3
RENDER RenderAddGlyphs               84 84
RENDER RenderCompositeGlyphs8     15960 15960
RENDER RenderFillRectangles       41584 17504
RENDER RenderSetPictureTransform 102732 0
RENDER RenderSetPictureFilter    102732 54398
BIG-REQUESTS BigReqEnable            12 12
--
Chris Wilson