83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*
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* Copyright 2005-2006 Luc Verhaegen.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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#include "xf86.h"
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#include "xf86Modes.h"
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#include <string.h>
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#include <libxcvt/libxcvt.h>
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/*
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* Generate a CVT standard mode from HDisplay, VDisplay and VRefresh.
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*
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* These calculations are stolen from the CVT calculation spreadsheet written
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* by Graham Loveridge. He seems to be claiming no copyright and there seems to
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* be no license attached to this. He apparently just wants to see his name
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* mentioned.
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*
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* This file can be found at http://www.vesa.org/Public/CVT/CVTd6r1.xls
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*
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* Comments and structure corresponds to the comments and structure of the xls.
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* This should ease importing of future changes to the standard (not very
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* likely though).
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*
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* About margins; i'm sure that they are to be the bit between HDisplay and
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* HBlankStart, HBlankEnd and HTotal, VDisplay and VBlankStart, VBlankEnd and
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* VTotal, where the overscan colour is shown. FB seems to call _all_ blanking
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* outside sync "margin" for some reason. Since we prefer seeing proper
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* blanking instead of the overscan colour, and since the Crtc* values will
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* probably get altered after us, we will disable margins altogether. With
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* these calculations, Margins will plainly expand H/VDisplay, and we don't
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* want that. -- libv
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*
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*/
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DisplayModePtr
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xf86CVTMode(int HDisplay, int VDisplay, float VRefresh, Bool Reduced,
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Bool Interlaced)
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{
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struct libxcvt_mode_info *libxcvt_mode_info;
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DisplayModeRec *Mode = xnfcalloc(1, sizeof(DisplayModeRec));
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libxcvt_mode_info =
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libxcvt_gen_mode_info(HDisplay, VDisplay, VRefresh, Reduced, Interlaced);
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Mode->VDisplay = libxcvt_mode_info->vdisplay;
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Mode->HDisplay = libxcvt_mode_info->hdisplay;
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Mode->Clock = libxcvt_mode_info->dot_clock;
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Mode->HSyncStart = libxcvt_mode_info->hsync_start;
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Mode->HSyncEnd = libxcvt_mode_info->hsync_end;
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Mode->HTotal = libxcvt_mode_info->htotal;
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Mode->VSyncStart = libxcvt_mode_info->vsync_start;
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Mode->VSyncEnd = libxcvt_mode_info->vsync_end;
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Mode->VTotal = libxcvt_mode_info->vtotal;
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Mode->VRefresh = libxcvt_mode_info->vrefresh;
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Mode->Flags = libxcvt_mode_info->mode_flags;
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free(libxcvt_mode_info);
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return Mode;
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}
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