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On drivers that do not support glGetTexImage2D (i.e. on GLES), cogl_texture_get_data() has a "feature" that allows it to download texture data by rendering the texture on an intermediate framebuffer object and then reading back the data from there. However, this feature requires the user to have previously set an "active" framebuffer object in the context, which makes this very tricky because it is not clear to the developer that he needs to do that in order for some code to work on GLES (of course it works on desktop GL, so nobody notices...) and additionally the code actually crashes if an active fbo is not set! This patch basically removes this feature in order to prevent the crash and is in line with how this code has evolved in cogl-2.0: https://git.gnome.org/browse/cogl/commit/?id=6d6a277b8e9a63a8268046e5258877ba94a1da5b https://bugzilla.gnome.org/show_bug.cgi?id=789961