The uaccess.h header is no longer required for any code that touches
external ("user") memory, since such memory accesses are now performed
through pointer dereferences. Reduce the number of files including
this header.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Scrolling currently involves redrawing every character cell, which can
be frustratingly slow on large framebuffer consoles. Accelerate this
operation by skipping the redraw for any unchanged character cells.
In the common case that large areas of the screen contain whitespace,
this optimises away the vast majority of the redrawing operations.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Simplify the framebuffer console drivers by assuming that the raw
framebuffer, character cell array, background picture, and glyph data
are all directly accessible via pointer dereferences.
In particular, this avoids the need to copy each glyph during drawing:
the VESA framebuffer driver can simply return a pointer to the glyph
data stored in the video ROM.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Remove the intermediate concept of a user pointer from physical
address conversions, leaving virt_to_phys() and phys_to_virt() as the
directly implemented functions.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The memcpy_user(), memmove_user(), memcmp_user(), memset_user(), and
strlen_user() functions are now just straightforward wrappers around
the corresponding standard library functions.
Remove these redundant wrappers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Accumulate UTF-8 characters in fbcon_putchar(), and require the frame
buffer console's .glyph() method to accept Unicode character values.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Centre the background picture on the console, to give a more
consistent result when the aspect ratio does not match the requested
width and height.
Once drawn for the first time, nothing should ever overwrite the
margins of the display. We can therefore eliminate the logic used to
redraw only the margin areas, and use much simpler code to draw the
complete initial background image.
Simplify the redrawing logic further by making the background picture
buffer equal in size to the frame buffer. In the common case of a
background picture which is designed to fill the screen, this wastes
no extra memory, and the combined code simplifications reduce the size
of fbcon.o by approximately 15%.
Redefine the concept of "margin" to match the intuitive definition
(i.e. the size of the gap, rather than the position of the boundary
line).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
