95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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sortix-vga.h
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Provides access to the VGA framebuffer under Sortix. This is highly
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unportable and is very likely to be removed or changed radically.
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******************************************************************************/
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#ifndef LIBMAXSI_SORTIX_VGA_H
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#define LIBMAXSI_SORTIX_VGA_H
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namespace System
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{
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namespace VGA
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{
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// TODO: Move these to a better place
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#define COLOR8_BLACK 0
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#define COLOR8_BLUE 1
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#define COLOR8_GREEN 2
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#define COLOR8_CYAN 3
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#define COLOR8_RED 4
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#define COLOR8_MAGENTA 5
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#define COLOR8_BROWN 6
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#define COLOR8_LIGHT_GREY 7
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#define COLOR8_DARK_GREY 8
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#define COLOR8_LIGHT_BLUE 9
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#define COLOR8_LIGHT_GREEN 10
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#define COLOR8_LIGHT_CYAN 11
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#define COLOR8_LIGHT_RED 12
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#define COLOR8_LIGHT_MAGENTA 13
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#define COLOR8_LIGHT_BROWN 14
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#define COLOR8_WHITE 15
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// This is the contents of a VGA framebuffer used in text mode. The
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// lower 8 lower bits correspond to an ASCII character, the next 4 bits
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// is the text color, and the upper 4 bits are the background color.
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struct Frame
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{
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public:
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// The width of each line in characters.
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const static size_t width = 80;
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// The number of lines.
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const static size_t height = 25;
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// The data containing the frame.
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uint16_t text[width * height];
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// An opaque file descriptor that defines this frame. Used to change
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// the current frame or deleting frames.
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int fd;
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// Beware: The kernel may or may keep more hidden data here. You may
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// not depend on the usage of this area.
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private:
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// Only the kernel may create an instance of this structure.
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Frame() { }
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};
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// Allocates a framebuffer able to store VGA data. This buffer is not
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// relocatable and must remain at this position.
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Frame* CreateFrame();
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// Sets the process' current VGA frame. If the process currently have
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// focus, then this is the frame shown on the screen. Any edits done
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// on this frame while it is active will be shown instantly on the
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// screen if the process have focus.
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int ChangeFrame(int fd);
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// Deletes a frame. This is equivalent to IO::Close(fd).
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int DeleteFrame(int fd);
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}
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}
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#endif
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