e573d4ca03
If texture can be uploaded to GL using glTexImage2D normally, but cannot be read back using glReadPixels, we still can accelerate it, but we cannot create pixmap with FBO using this texture type. So, add a flag to avoid such creations. This allow us to accelerate 8-bit glyph masks on GL ES 2.0, because those masks are used only as textures, and in next stages are rendered on RGBA surfaces normally, so, we do not need to call glReadPixels on them. This is needed for correctly working fonts on GL ES 2.0, due to inability to use GL_RED and texture swizzle. We should use GL_ALPHA there, and with this format we cannot have a complete framebuffer. But completed framebuffer, according to testing, is not required for fonts anyway. Also it fixes all 8-bit formats for GLES2. Fixes #1362 Fixes #1411 Signed-off-by: Konstantin Pugin <ria.freelander@gmail.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Acked-by: Michel Dänzer <mdaenzer@redhat.com> Acked-by: Martin Roukala <martin.roukala@mupuf.org>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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