2f4a68c8c3
The order and way include macros were structured was chaotic, with no real common thread between files. Try to tidy up the mess with some common scheme, to make things look less messy.
542 lines
13 KiB
C
542 lines
13 KiB
C
/*
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* Copyright 2007 Red Hat, Inc.
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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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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* the 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 (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/* Author: Soren Sandmann <sandmann@redhat.com> */
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <glib.h>
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#include "backends/edid.h"
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static int
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get_bit (int in, int bit)
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{
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return (in & (1 << bit)) >> bit;
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}
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static int
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get_bits (int in, int begin, int end)
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{
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int mask = (1 << (end - begin + 1)) - 1;
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return (in >> begin) & mask;
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}
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static int
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decode_header (const uchar *edid)
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{
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if (memcmp (edid, "\x00\xff\xff\xff\xff\xff\xff\x00", 8) == 0)
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return TRUE;
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return FALSE;
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}
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static int
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decode_vendor_and_product_identification (const uchar *edid, MonitorInfo *info)
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{
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int is_model_year;
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/* Manufacturer Code */
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info->manufacturer_code[0] = get_bits (edid[0x08], 2, 6);
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info->manufacturer_code[1] = get_bits (edid[0x08], 0, 1) << 3;
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info->manufacturer_code[1] |= get_bits (edid[0x09], 5, 7);
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info->manufacturer_code[2] = get_bits (edid[0x09], 0, 4);
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info->manufacturer_code[3] = '\0';
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info->manufacturer_code[0] += 'A' - 1;
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info->manufacturer_code[1] += 'A' - 1;
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info->manufacturer_code[2] += 'A' - 1;
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/* Product Code */
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info->product_code = edid[0x0b] << 8 | edid[0x0a];
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/* Serial Number */
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info->serial_number =
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edid[0x0c] | edid[0x0d] << 8 | edid[0x0e] << 16 | edid[0x0f] << 24;
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/* Week and Year */
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is_model_year = FALSE;
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switch (edid[0x10])
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{
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case 0x00:
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info->production_week = -1;
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break;
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case 0xff:
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info->production_week = -1;
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is_model_year = TRUE;
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break;
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default:
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info->production_week = edid[0x10];
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break;
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}
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if (is_model_year)
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{
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info->production_year = -1;
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info->model_year = 1990 + edid[0x11];
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}
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else
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{
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info->production_year = 1990 + edid[0x11];
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info->model_year = -1;
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}
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return TRUE;
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}
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static int
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decode_edid_version (const uchar *edid, MonitorInfo *info)
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{
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info->major_version = edid[0x12];
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info->minor_version = edid[0x13];
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return TRUE;
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}
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static int
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decode_display_parameters (const uchar *edid, MonitorInfo *info)
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{
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/* Digital vs Analog */
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info->is_digital = get_bit (edid[0x14], 7);
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if (info->is_digital)
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{
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int bits;
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static const int bit_depth[8] =
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{
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-1, 6, 8, 10, 12, 14, 16, -1
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};
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static const Interface interfaces[6] =
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{
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UNDEFINED, DVI, HDMI_A, HDMI_B, MDDI, DISPLAY_PORT
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};
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bits = get_bits (edid[0x14], 4, 6);
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info->connector.digital.bits_per_primary = bit_depth[bits];
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bits = get_bits (edid[0x14], 0, 3);
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if (bits <= 5)
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info->connector.digital.interface = interfaces[bits];
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else
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info->connector.digital.interface = UNDEFINED;
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}
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else
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{
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int bits = get_bits (edid[0x14], 5, 6);
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static const double levels[][3] =
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{
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{ 0.7, 0.3, 1.0 },
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{ 0.714, 0.286, 1.0 },
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{ 1.0, 0.4, 1.4 },
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{ 0.7, 0.0, 0.7 },
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};
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info->connector.analog.video_signal_level = levels[bits][0];
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info->connector.analog.sync_signal_level = levels[bits][1];
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info->connector.analog.total_signal_level = levels[bits][2];
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info->connector.analog.blank_to_black = get_bit (edid[0x14], 4);
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info->connector.analog.separate_hv_sync = get_bit (edid[0x14], 3);
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info->connector.analog.composite_sync_on_h = get_bit (edid[0x14], 2);
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info->connector.analog.composite_sync_on_green = get_bit (edid[0x14], 1);
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info->connector.analog.serration_on_vsync = get_bit (edid[0x14], 0);
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}
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/* Screen Size / Aspect Ratio */
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if (edid[0x15] == 0 && edid[0x16] == 0)
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{
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info->width_mm = -1;
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info->height_mm = -1;
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info->aspect_ratio = -1.0;
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}
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else if (edid[0x16] == 0)
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{
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info->width_mm = -1;
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info->height_mm = -1;
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info->aspect_ratio = 100.0 / (edid[0x15] + 99);
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}
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else if (edid[0x15] == 0)
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{
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info->width_mm = -1;
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info->height_mm = -1;
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info->aspect_ratio = 100.0 / (edid[0x16] + 99);
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info->aspect_ratio = 1/info->aspect_ratio; /* portrait */
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}
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else
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{
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info->width_mm = 10 * edid[0x15];
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info->height_mm = 10 * edid[0x16];
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}
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/* Gamma */
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if (edid[0x17] == 0xFF)
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info->gamma = -1.0;
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else
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info->gamma = (edid[0x17] + 100.0) / 100.0;
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/* Features */
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info->standby = get_bit (edid[0x18], 7);
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info->suspend = get_bit (edid[0x18], 6);
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info->active_off = get_bit (edid[0x18], 5);
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if (info->is_digital)
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{
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info->connector.digital.rgb444 = TRUE;
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if (get_bit (edid[0x18], 3))
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info->connector.digital.ycrcb444 = 1;
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if (get_bit (edid[0x18], 4))
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info->connector.digital.ycrcb422 = 1;
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}
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else
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{
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int bits = get_bits (edid[0x18], 3, 4);
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ColorType color_type[4] =
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{
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MONOCHROME, RGB, OTHER_COLOR, UNDEFINED_COLOR
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};
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info->connector.analog.color_type = color_type[bits];
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}
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info->srgb_is_standard = get_bit (edid[0x18], 2);
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/* In 1.3 this is called "has preferred timing" */
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info->preferred_timing_includes_native = get_bit (edid[0x18], 1);
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/* FIXME: In 1.3 this indicates whether the monitor accepts GTF */
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info->continuous_frequency = get_bit (edid[0x18], 0);
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return TRUE;
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}
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static double
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decode_fraction (int high, int low)
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{
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double result = 0.0;
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int i;
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high = (high << 2) | low;
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for (i = 0; i < 10; ++i)
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result += get_bit (high, i) * pow (2, i - 10);
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return result;
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}
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static int
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decode_color_characteristics (const uchar *edid, MonitorInfo *info)
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{
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info->red_x = decode_fraction (edid[0x1b], get_bits (edid[0x19], 6, 7));
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info->red_y = decode_fraction (edid[0x1c], get_bits (edid[0x19], 5, 4));
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info->green_x = decode_fraction (edid[0x1d], get_bits (edid[0x19], 2, 3));
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info->green_y = decode_fraction (edid[0x1e], get_bits (edid[0x19], 0, 1));
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info->blue_x = decode_fraction (edid[0x1f], get_bits (edid[0x1a], 6, 7));
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info->blue_y = decode_fraction (edid[0x20], get_bits (edid[0x1a], 4, 5));
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info->white_x = decode_fraction (edid[0x21], get_bits (edid[0x1a], 2, 3));
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info->white_y = decode_fraction (edid[0x22], get_bits (edid[0x1a], 0, 1));
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return TRUE;
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}
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static int
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decode_established_timings (const uchar *edid, MonitorInfo *info)
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{
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static const Timing established[][8] =
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{
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{
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{ 800, 600, 60 },
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{ 800, 600, 56 },
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{ 640, 480, 75 },
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{ 640, 480, 72 },
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{ 640, 480, 67 },
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{ 640, 480, 60 },
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{ 720, 400, 88 },
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{ 720, 400, 70 }
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},
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{
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{ 1280, 1024, 75 },
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{ 1024, 768, 75 },
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{ 1024, 768, 70 },
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{ 1024, 768, 60 },
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{ 1024, 768, 87 },
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{ 832, 624, 75 },
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{ 800, 600, 75 },
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{ 800, 600, 72 }
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},
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{
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{ 0, 0, 0 },
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{ 0, 0, 0 },
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{ 0, 0, 0 },
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{ 0, 0, 0 },
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{ 0, 0, 0 },
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{ 0, 0, 0 },
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{ 0, 0, 0 },
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{ 1152, 870, 75 }
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},
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};
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int i, j, idx;
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idx = 0;
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for (i = 0; i < 3; ++i)
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{
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for (j = 0; j < 8; ++j)
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{
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int byte = edid[0x23 + i];
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if (get_bit (byte, j) && established[i][j].frequency != 0)
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info->established[idx++] = established[i][j];
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}
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}
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return TRUE;
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}
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static int
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decode_standard_timings (const uchar *edid, MonitorInfo *info)
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{
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int i;
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for (i = 0; i < 8; i++)
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{
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int first = edid[0x26 + 2 * i];
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int second = edid[0x27 + 2 * i];
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if (first != 0x01 && second != 0x01)
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{
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int w = 8 * (first + 31);
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int h = 0;
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switch (get_bits (second, 6, 7))
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{
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case 0x00: h = (w / 16) * 10; break;
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case 0x01: h = (w / 4) * 3; break;
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case 0x02: h = (w / 5) * 4; break;
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case 0x03: h = (w / 16) * 9; break;
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}
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info->standard[i].width = w;
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info->standard[i].height = h;
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info->standard[i].frequency = get_bits (second, 0, 5) + 60;
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}
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}
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return TRUE;
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}
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static void
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decode_lf_string (const uchar *s, int n_chars, char *result)
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{
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int i;
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for (i = 0; i < n_chars; ++i)
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{
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if (s[i] == 0x0a)
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{
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*result++ = '\0';
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break;
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}
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else if (s[i] == 0x00)
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{
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/* Convert embedded 0's to spaces */
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*result++ = ' ';
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}
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else
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{
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*result++ = s[i];
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}
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}
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}
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static void
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decode_display_descriptor (const uchar *desc,
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MonitorInfo *info)
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{
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switch (desc[0x03])
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{
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case 0xFC:
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decode_lf_string (desc + 5, 13, info->dsc_product_name);
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break;
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case 0xFF:
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decode_lf_string (desc + 5, 13, info->dsc_serial_number);
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break;
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case 0xFE:
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decode_lf_string (desc + 5, 13, info->dsc_string);
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break;
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case 0xFD:
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/* Range Limits */
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break;
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case 0xFB:
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/* Color Point */
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break;
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case 0xFA:
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/* Timing Identifications */
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break;
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case 0xF9:
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/* Color Management */
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break;
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case 0xF8:
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/* Timing Codes */
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break;
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case 0xF7:
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/* Established Timings */
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break;
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case 0x10:
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break;
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}
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}
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static void
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decode_detailed_timing (const uchar *timing,
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DetailedTiming *detailed)
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{
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int bits;
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StereoType stereo[] =
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{
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NO_STEREO, NO_STEREO, FIELD_RIGHT, FIELD_LEFT,
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TWO_WAY_RIGHT_ON_EVEN, TWO_WAY_LEFT_ON_EVEN,
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FOUR_WAY_INTERLEAVED, SIDE_BY_SIDE
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};
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detailed->pixel_clock = (timing[0x00] | timing[0x01] << 8) * 10000;
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detailed->h_addr = timing[0x02] | ((timing[0x04] & 0xf0) << 4);
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detailed->h_blank = timing[0x03] | ((timing[0x04] & 0x0f) << 8);
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detailed->v_addr = timing[0x05] | ((timing[0x07] & 0xf0) << 4);
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detailed->v_blank = timing[0x06] | ((timing[0x07] & 0x0f) << 8);
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detailed->h_front_porch = timing[0x08] | get_bits (timing[0x0b], 6, 7) << 8;
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detailed->h_sync = timing[0x09] | get_bits (timing[0x0b], 4, 5) << 8;
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detailed->v_front_porch =
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get_bits (timing[0x0a], 4, 7) | get_bits (timing[0x0b], 2, 3) << 4;
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detailed->v_sync =
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get_bits (timing[0x0a], 0, 3) | get_bits (timing[0x0b], 0, 1) << 4;
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detailed->width_mm = timing[0x0c] | get_bits (timing[0x0e], 4, 7) << 8;
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detailed->height_mm = timing[0x0d] | get_bits (timing[0x0e], 0, 3) << 8;
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detailed->right_border = timing[0x0f];
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detailed->top_border = timing[0x10];
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detailed->interlaced = get_bit (timing[0x11], 7);
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/* Stereo */
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bits = get_bits (timing[0x11], 5, 6) << 1 | get_bit (timing[0x11], 0);
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detailed->stereo = stereo[bits];
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/* Sync */
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bits = timing[0x11];
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detailed->digital_sync = get_bit (bits, 4);
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if (detailed->digital_sync)
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{
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detailed->connector.digital.composite = !get_bit (bits, 3);
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if (detailed->connector.digital.composite)
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{
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detailed->connector.digital.serrations = get_bit (bits, 2);
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detailed->connector.digital.negative_vsync = FALSE;
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}
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else
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{
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detailed->connector.digital.serrations = FALSE;
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detailed->connector.digital.negative_vsync = !get_bit (bits, 2);
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}
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detailed->connector.digital.negative_hsync = !get_bit (bits, 0);
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}
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else
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{
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detailed->connector.analog.bipolar = get_bit (bits, 3);
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detailed->connector.analog.serrations = get_bit (bits, 2);
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detailed->connector.analog.sync_on_green = !get_bit (bits, 1);
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}
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}
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static int
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decode_descriptors (const uchar *edid, MonitorInfo *info)
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{
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int i;
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int timing_idx;
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timing_idx = 0;
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for (i = 0; i < 4; ++i)
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{
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int index = 0x36 + i * 18;
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if (edid[index + 0] == 0x00 && edid[index + 1] == 0x00)
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{
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decode_display_descriptor (edid + index, info);
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}
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else
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{
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decode_detailed_timing (edid + index, &(info->detailed_timings[timing_idx++]));
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}
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}
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info->n_detailed_timings = timing_idx;
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return TRUE;
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}
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static void
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decode_check_sum (const uchar *edid,
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MonitorInfo *info)
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{
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int i;
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uchar check = 0;
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for (i = 0; i < 128; ++i)
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check += edid[i];
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|
|
info->checksum = check;
|
|
}
|
|
|
|
MonitorInfo *
|
|
decode_edid (const uchar *edid)
|
|
{
|
|
MonitorInfo *info = g_new0 (MonitorInfo, 1);
|
|
|
|
decode_check_sum (edid, info);
|
|
|
|
if (decode_header (edid)
|
|
&& decode_vendor_and_product_identification (edid, info)
|
|
&& decode_edid_version (edid, info)
|
|
&& decode_display_parameters (edid, info)
|
|
&& decode_color_characteristics (edid, info)
|
|
&& decode_established_timings (edid, info)
|
|
&& decode_standard_timings (edid, info)
|
|
&& decode_descriptors (edid, info))
|
|
{
|
|
return info;
|
|
}
|
|
else
|
|
{
|
|
g_free (info);
|
|
return NULL;
|
|
}
|
|
}
|