[cogl] (18 commits) Created branch wip/pbo-read-pixels

[Neil Roberts <nroberts src gnome org>]

The branch 'wip/pbo-read-pixels' was created.

Summary of new commits:

  fab4ec8... Add a conformance test for reading back an RGBA texture as 
  1a2c6e2... Assert that we get a valid format in pixel_format_to_gl{,es
  9fc7caf... Avoid making up the format COGL_PIXEL_FORMAT_A_8_PRE
  8e2a42b... bitmap-fallback: Support converting all pixel format types
  c64b3d6... tests: Test reading all pixel formats
  06d8789... tests: Add a test which writes all pixel formats
  f8fef7f... bitmap: Remove the split between 'image library' and 'fallb
  089cb33... _cogl_bitmap_convert: Also handle premult conversions
  57bd124... bitmap: Add a function to convert into an existing buffer
  df6efe2... bitmap: Support pre/unpre-multiplying any format
  51c7a7e... cogl-buffer: Create the buffer store when bound
  91c85e1... Add a public cogl_framebuffer_read_pixels_into_bitmap
  4ffd1cf... Change API so that CoglPixelBuffer no longer knows its w/h/
  a47956b... Make _cogl_bitmap_get_{width,height,format,rowstride} publi
  7487777... Add the missing cast macros for some buffer objects
  c099a0f... cogl-bitmap: Add a public accessor for the underlying pixel
  b46424b... Port the test-pixel-buffer test
  91394ca... Fix point size