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authorMattias Andrée <maandree@operamail.com>2014-05-31 07:32:09 +0200
committerMattias Andrée <maandree@operamail.com>2014-05-31 07:32:09 +0200
commitbdeb7f77f16b1e482904866ff21e43f8bfc01bb0 (patch)
treee5587a577db53a58ea52fd2579fa0cbb89007491 /src/edid.c
parentsplit out error identification for failure of open from libgamma_linux_drm_partition_initialise (diff)
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/edid.c')
-rw-r--r--src/edid.c79
1 files changed, 0 insertions, 79 deletions
diff --git a/src/edid.c b/src/edid.c
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--- a/src/edid.c
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@@ -1,79 +0,0 @@
-/**
- * libgamma — Display server abstraction layer for gamma ramp adjustments
- * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
- *
- * This library is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this library. If not, see <http://www.gnu.org/licenses/>.
- */
-#include "edid.h"
-
-#include "libgamma-method.h"
-#include "libgamma-error.h"
-
-#include <stdint.h>
-
-
-/**
- * Parse the EDID of a monitor.
- *
- * @param this Instance of a data structure to fill with the information about the EDID.
- * It must contain the EDID and its length.
- * @param feilds OR:ed identifiers for the information about the EDID that should be parsed.
- * Fields that do not have to do with EDID are ignored.
- * @return Non-zero on error.
- */
-int libgamma_parse_edid(libgamma_crtc_information_t* restrict this, int32_t fields)
-{
-#define __test_version(edid, major, minor) (((edid)[18] == major) && ((edid)[19] == minor))
-
- int error = 0;
- int checksum = 0;
- size_t i;
-
- if (this->edid_length != 128)
- error = LIBGAMMA_EDID_LENGTH_UNSUPPORTED;
- else if ((this->edid[0] != 0x00) || (this->edid[1] != 0xFF) || (this->edid[2] != 0xFF) || (this->edid[3] != 0xFF) ||
- (this->edid[4] != 0xFF) || (this->edid[5] != 0xFF) || (this->edid[6] != 0xFF) || (this->edid[7] != 0x00))
- error = LIBGAMMA_EDID_WRONG_MAGIC_NUMBER;
- else if (__test_version(this->edid, 1, 3) == 0)
- error = LIBGAMMA_EDID_REVISION_UNSUPPORTED;
-
- this->width_mm_edid_error = this->height_mm_edid_error = this->gamma_error = error;
-
- this->width_mm_edid = (size_t)(this->edid[21]) * 10;
- this->height_mm_edid = (size_t)(this->edid[22]) * 10;
-
- if ((fields & LIBGAMMA_CRTC_INFO_GAMMA) && (error == 0))
- {
- if (this->edid[23] == 0xFF)
- this->gamma_error = LIBGAMMA_GAMMA_NOT_SPECIFIED;
- else
- this->gamma_red = this->gamma_green = this->gamma_blue = (float)((int)(this->edid[23]) + 100) / 100.f;
- }
-
- if (error == 0)
- for (i = 0; i < this->edid_length; i++)
- checksum += (int)(this->edid[i]);
- if ((checksum & 255))
- {
- error = LIBGAMMA_EDID_CHECKSUM_ERROR;
- this->edid_error = this->width_mm_edid_error = this->height_mm_edid_error = error;
- this->gamma_error = this->gamma_error == LIBGAMMA_GAMMA_NOT_SPECIFIED
- ? LIBGAMMA_GAMMA_NOT_SPECIFIED_AND_EDID_CHECKSUM_ERROR : 0;
- }
-
- return error | this->gamma_error;
-
-#undef __test_version
-}
-