cogl-pango-render: Add the base texture to the display list
cogl-pango-render: Add the base texture to the display list

When rendering a glyph from a texture, instead of adding the glyph's
texture handle to the display list it now retrieves the base texture
using _cogl_texture_foreach_subtexture_in_region and adds that
instead. That way the display can recognise that glyphs in the global
atlas are sharing the same texture and combine them into one VBO.

Distrotech/cogl,djdeath/cogl-android,Distrotech/cogl,djdeath/cogl,djdeath/cogl,gcampax/cogl,djdeath/cogl-android,Distrotech/cogl,gcampax/cogl,spatulasnout/cogl,collects/cogl,Distrotech/cogl,collects/cogl,djdeath/cogl-android,djdeath/cogl,gcampax/cogl,spatulasnout/cogl,gcampax/cogl