Add a chart at the bottom 10% of the screen where each
bar represents the time the frame took to be painted. The
red line represents the maximum time to draw. For example,
if you are on a 60Hz monitor, the red line means 16.6667
miliseconds.
This covers both layout time (green) and paint time (blue).
shaped-texture: Use draw_rectangle() for full paints
This reverts a change introduced in edfe5cc3 to use `paint_clipped_rectangle()`
instead of `cogl_framebuffer_draw_rectangle()` for full paints as it
contained logic necessary for viewport src-rects. This is not longer the case.
shaped-texture: Use CoglMatrix for viewport src-rect
This brings the viewport src-rect code in line with how we handle
transforms, by applying a `CoglMatrix` to the pipeline instead of
changing the paint logic.
It also fixes not-y-inverted textures in combination with
transforms.
