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-rw-r--r--3rdParty/EDID/edid.cpp446
1 files changed, 446 insertions, 0 deletions
diff --git a/3rdParty/EDID/edid.cpp b/3rdParty/EDID/edid.cpp
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+/*
+ * Copyright 2007 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* Author: Soren Sandmann <[email protected]> */
+#include "edid.h"
+#include <stdint.h>
+#include <math.h>
+#include <memory.h>
+#include <X11/Xatom.h>
+
+
+static int get_bit(int in, int bit) {
+ return (in & (1 << bit)) >> bit;
+}
+
+static int get_bits(int in, int begin, int end) {
+ int mask = (1 << (end - begin + 1)) - 1;
+
+ return (in >> begin) & mask;
+}
+
+static bool decode_header(const uint8_t *edid) {
+ if (memcmp(edid, "\x00\xff\xff\xff\xff\xff\xff\x00", 8) == 0)
+ return true;
+ return false;
+}
+
+static int decode_vendor_and_product_identification(const uint8_t *edid, MonitorInfo *info) {
+
+ /* Manufacturer Code */
+ info->manufacturer_code[0] = get_bits(edid[0x08], 2, 6);
+ info->manufacturer_code[1] = get_bits(edid[0x08], 0, 1) << 3;
+ info->manufacturer_code[1] |= get_bits(edid[0x09], 5, 7);
+ info->manufacturer_code[2] = get_bits(edid[0x09], 0, 4);
+ info->manufacturer_code[3] = '\0';
+
+ info->manufacturer_code[0] += 'A' - 1;
+ info->manufacturer_code[1] += 'A' - 1;
+ info->manufacturer_code[2] += 'A' - 1;
+
+ /* Product Code */
+ info->product_code = edid[0x0b] << 8 | edid[0x0a];
+
+ /* Serial Number */
+ info->serial_number = edid[0x0c] | edid[0x0d] << 8 | edid[0x0e] << 16 | edid[0x0f] << 24;
+
+ /* Week and Year */
+ bool is_model_year = false;
+ switch (edid[0x10]) {
+ case 0x00:
+ info->production_week = -1;
+ break;
+
+ case 0xff:
+ info->production_week = -1;
+ is_model_year = true;
+ break;
+
+ default:
+ info->production_week = edid[0x10];
+ break;
+ }
+
+ if (is_model_year) {
+ info->production_year = -1;
+ info->model_year = 1990 + edid[0x11];
+ } else {
+ info->production_year = 1990 + edid[0x11];
+ info->model_year = -1;
+ }
+
+ return true;
+}
+
+static bool decode_edid_version(const uint8_t *edid, MonitorInfo *info) {
+ info->major_version = edid[0x12];
+ info->minor_version = edid[0x13];
+ return true;
+}
+
+static bool decode_display_parameters(const uint8_t *edid, MonitorInfo *info) {
+ /* Digital vs Analog */
+ info->is_digital = get_bit(edid[0x14], 7);
+
+ if (info->is_digital) {
+ static const int bit_depth[8] = { -1, 6, 8, 10, 12, 14, 16, -1 };
+ static const Interface interfaces[6] = { UNDEFINED, DVI, HDMI_A, HDMI_B, MDDI, DISPLAY_PORT };
+
+ int bits = get_bits(edid[0x14], 4, 6);
+ info->connector.digital.bits_per_primary = bit_depth[bits];
+
+ bits = get_bits(edid[0x14], 0, 3);
+ if (bits <= 5)
+ info->connector.digital.interface = interfaces[bits];
+ else
+ info->connector.digital.interface = UNDEFINED;
+ } else {
+ int bits = get_bits(edid[0x14], 5, 6);
+ static const double levels[][3] = { //
+ { 0.7, 0.3, 1.0 }, //
+ { 0.714, 0.286, 1.0 }, //
+ { 1.0, 0.4, 1.4 }, //
+ { 0.7, 0.0, 0.7 }, //
+ };
+
+ info->connector.analog.video_signal_level = levels[bits][0];
+ info->connector.analog.sync_signal_level = levels[bits][1];
+ info->connector.analog.total_signal_level = levels[bits][2];
+ info->connector.analog.blank_to_black = get_bit(edid[0x14], 4);
+ info->connector.analog.separate_hv_sync = get_bit(edid[0x14], 3);
+ info->connector.analog.composite_sync_on_h = get_bit(edid[0x14], 2);
+ info->connector.analog.composite_sync_on_green = get_bit(edid[0x14], 1);
+ info->connector.analog.serration_on_vsync = get_bit(edid[0x14], 0);
+ }
+
+ /* Screen Size / Aspect Ratio */
+ if (edid[0x15] == 0 && edid[0x16] == 0) {
+ info->width_mm = -1;
+ info->height_mm = -1;
+ info->aspect_ratio = -1.0;
+ } else if (edid[0x16] == 0) {
+ info->width_mm = -1;
+ info->height_mm = -1;
+ info->aspect_ratio = 100.0 / (edid[0x15] + 99);
+ } else if (edid[0x15] == 0) {
+ info->width_mm = -1;
+ info->height_mm = -1;
+ info->aspect_ratio = 100.0 / (edid[0x16] + 99);
+ info->aspect_ratio = 1 / info->aspect_ratio; /* portrait */
+ } else {
+ info->width_mm = 10 * edid[0x15];
+ info->height_mm = 10 * edid[0x16];
+ }
+
+ /* Gamma */
+ if (edid[0x17] == 0xFF)
+ info->gamma = -1.0;
+ else
+ info->gamma = (edid[0x17] + 100.0) / 100.0;
+
+ /* Features */
+ info->standby = get_bit(edid[0x18], 7);
+ info->suspend = get_bit(edid[0x18], 6);
+ info->active_off = get_bit(edid[0x18], 5);
+
+ if (info->is_digital) {
+ info->connector.digital.rgb444 = 1;
+ if (get_bit(edid[0x18], 3))
+ info->connector.digital.ycrcb444 = 1;
+ if (get_bit(edid[0x18], 4))
+ info->connector.digital.ycrcb422 = 1;
+ } else {
+ int bits = get_bits(edid[0x18], 3, 4);
+ ColorType color_type[4] = { MONOCHROME, RGB, OTHER_COLOR, UNDEFINED_COLOR };
+
+ info->connector.analog.color_type = color_type[bits];
+ }
+
+ info->srgb_is_standard = get_bit(edid[0x18], 2);
+
+ /* In 1.3 this is called "has preferred timing" */
+ info->preferred_timing_includes_native = get_bit(edid[0x18], 1);
+
+ /* FIXME: In 1.3 this indicates whether the monitor accepts GTF */
+ info->continuous_frequency = get_bit(edid[0x18], 0);
+ return true;
+}
+
+static double decode_fraction(int high, int low) {
+ double result = 0.0;
+ high = (high << 2) | low;
+ for (int i = 0; i < 10; ++i)
+ result += get_bit(high, i) * pow(2, i - 10);
+ return result;
+}
+
+static bool decode_color_characteristics(const uint8_t *edid, MonitorInfo *info) {
+ info->red_x = decode_fraction(edid[0x1b], get_bits(edid[0x19], 6, 7));
+ info->red_y = decode_fraction(edid[0x1c], get_bits(edid[0x19], 5, 4));
+ info->green_x = decode_fraction(edid[0x1d], get_bits(edid[0x19], 2, 3));
+ info->green_y = decode_fraction(edid[0x1e], get_bits(edid[0x19], 0, 1));
+ info->blue_x = decode_fraction(edid[0x1f], get_bits(edid[0x1a], 6, 7));
+ info->blue_y = decode_fraction(edid[0x20], get_bits(edid[0x1a], 4, 5));
+ info->white_x = decode_fraction(edid[0x21], get_bits(edid[0x1a], 2, 3));
+ info->white_y = decode_fraction(edid[0x22], get_bits(edid[0x1a], 0, 1));
+
+ return true;
+}
+
+static bool decode_established_timings(const uint8_t *edid, MonitorInfo *info) {
+ static const Timing established[][8] = { //
+ { { 800, 600, 60 }, { 800, 600, 56 }, //
+ { 640, 480, 75 }, { 640, 480, 72 }, //
+ { 640, 480, 67 }, { 640, 480, 60 }, //
+ { 720, 400, 88 }, { 720, 400, 70 } }, //
+ { { 1280, 1024, 75 }, { 1024, 768, 75 }, //
+ { 1024, 768, 70 }, { 1024, 768, 60 }, //
+ { 1024, 768, 87 }, { 832, 624, 75 }, //
+ { 800, 600, 75 }, { 800, 600, 72 } }, //
+ { { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, //
+ { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 1152, 870, 75 } }, //
+ };
+
+ int idx = 0;
+ for (int i = 0; i < 3; ++i) {
+ for (int j = 0; j < 8; ++j) {
+ int byte = edid[0x23 + i];
+
+ if (get_bit(byte, j) && established[i][j].frequency != 0)
+ info->established[idx++] = established[i][j];
+ }
+ }
+ return true;
+}
+
+static bool decode_standard_timings(const uint8_t *edid, MonitorInfo *info) {
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ int first = edid[0x26 + 2 * i];
+ int second = edid[0x27 + 2 * i];
+
+ if (first != 0x01 && second != 0x01) {
+ int w = 8 * (first + 31);
+ int h = 0;
+
+ switch (get_bits(second, 6, 7)) {
+ case 0x00:
+ h = (w / 16) * 10;
+ break;
+ case 0x01:
+ h = (w / 4) * 3;
+ break;
+ case 0x02:
+ h = (w / 5) * 4;
+ break;
+ case 0x03:
+ h = (w / 16) * 9;
+ break;
+ }
+
+ info->standard[i].width = w;
+ info->standard[i].height = h;
+ info->standard[i].frequency = get_bits(second, 0, 5) + 60;
+ }
+ }
+
+ return true;
+}
+
+static void decode_lf_string(const uint8_t *s, int n_chars, char *result) {
+ int i;
+ for (i = 0; i < n_chars; ++i) {
+ if (s[i] == 0x0a) {
+ *result++ = '\0';
+ break;
+ } else if (s[i] == 0x00) {
+ /* Convert embedded 0's to spaces */
+ *result++ = ' ';
+ } else {
+ *result++ = s[i];
+ }
+ }
+}
+
+static void decode_display_descriptor(const uint8_t *desc, MonitorInfo *info) {
+ switch (desc[0x03]) {
+ case 0xFC:
+ decode_lf_string(desc + 5, 13, info->dsc_product_name);
+ break;
+ case 0xFF:
+ decode_lf_string(desc + 5, 13, info->dsc_serial_number);
+ break;
+ case 0xFE:
+ decode_lf_string(desc + 5, 13, info->dsc_string);
+ break;
+ case 0xFD:
+ /* Range Limits */
+ break;
+ case 0xFB:
+ /* Color Point */
+ break;
+ case 0xFA:
+ /* Timing Identifications */
+ break;
+ case 0xF9:
+ /* Color Management */
+ break;
+ case 0xF8:
+ /* Timing Codes */
+ break;
+ case 0xF7:
+ /* Established Timings */
+ break;
+ case 0x10:
+ break;
+ }
+}
+
+static void decode_detailed_timing(const uint8_t *timing, DetailedTiming *detailed) {
+ int bits;
+ StereoType stereo[] = { //
+ NO_STEREO, NO_STEREO, //
+ FIELD_RIGHT, FIELD_LEFT, //
+ TWO_WAY_RIGHT_ON_EVEN, TWO_WAY_LEFT_ON_EVEN, //
+ FOUR_WAY_INTERLEAVED, //
+ SIDE_BY_SIDE //
+ };
+
+ detailed->pixel_clock = (timing[0x00] | timing[0x01] << 8) * 10000;
+ detailed->h_addr = timing[0x02] | ((timing[0x04] & 0xf0) << 4);
+ detailed->h_blank = timing[0x03] | ((timing[0x04] & 0x0f) << 8);
+ detailed->v_addr = timing[0x05] | ((timing[0x07] & 0xf0) << 4);
+ detailed->v_blank = timing[0x06] | ((timing[0x07] & 0x0f) << 8);
+ detailed->h_front_porch = timing[0x08] | get_bits(timing[0x0b], 6, 7) << 8;
+ detailed->h_sync = timing[0x09] | get_bits(timing[0x0b], 4, 5) << 8;
+ detailed->v_front_porch = get_bits(timing[0x0a], 4, 7) | get_bits(timing[0x0b], 2, 3) << 4;
+ detailed->v_sync = get_bits(timing[0x0a], 0, 3) | get_bits(timing[0x0b], 0, 1) << 4;
+ detailed->width_mm = timing[0x0c] | get_bits(timing[0x0e], 4, 7) << 8;
+ detailed->height_mm = timing[0x0d] | get_bits(timing[0x0e], 0, 3) << 8;
+ detailed->right_border = timing[0x0f];
+ detailed->top_border = timing[0x10];
+ detailed->interlaced = get_bit(timing[0x11], 7);
+
+ /* Stereo */
+ bits = get_bits(timing[0x11], 5, 6) << 1 | get_bit(timing[0x11], 0);
+ detailed->stereo = stereo[bits];
+
+ /* Sync */
+ bits = timing[0x11];
+
+ detailed->digital_sync = get_bit(bits, 4);
+ if (detailed->digital_sync) {
+ detailed->connector.digital.composite = !get_bit(bits, 3);
+ if (detailed->connector.digital.composite) {
+ detailed->connector.digital.serrations = get_bit(bits, 2);
+ detailed->connector.digital.negative_vsync = 0;
+ } else {
+ detailed->connector.digital.serrations = 0;
+ detailed->connector.digital.negative_vsync = !get_bit(bits, 2);
+ }
+ detailed->connector.digital.negative_hsync = !get_bit(bits, 0);
+ } else {
+ detailed->connector.analog.bipolar = get_bit(bits, 3);
+ detailed->connector.analog.serrations = get_bit(bits, 2);
+ detailed->connector.analog.sync_on_green = !get_bit(bits, 1);
+ }
+}
+
+static bool decode_descriptors(const uint8_t *edid, MonitorInfo *info) {
+ int timing_idx = 0;
+ for (int i = 0; i < 4; ++i) {
+ int index = 0x36 + i * 18;
+ if (edid[index + 0] == 0x00 && edid[index + 1] == 0x00) {
+ decode_display_descriptor(edid + index, info);
+ } else {
+ decode_detailed_timing(edid + index, &(info->detailed_timings[timing_idx++]));
+ }
+ }
+ info->n_detailed_timings = timing_idx;
+ return true;
+}
+
+static void decode_check_sum(const uint8_t *edid, MonitorInfo *info) {
+ uint8_t check = 0;
+ for (int i = 0; i < 128; ++i)
+ check += edid[i];
+ info->checksum = check;
+}
+
+MonitorInfo * decode_edid(const uint8_t *edid) {
+ MonitorInfo *info = new MonitorInfo();
+ 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 {
+ delete info;
+ return 0;
+ }
+}
+
+static uint8_t * get_property(Display *dpy, RROutput output, Atom atom, int *len) {
+ unsigned char *prop;
+ int actual_format;
+ unsigned long nitems, bytes_after;
+ Atom actual_type;
+ uint8_t *result = NULL;
+
+ XRRGetOutputProperty(dpy, output, atom, 0, 100, False, False,
+ AnyPropertyType, &actual_type, &actual_format, &nitems, &bytes_after, &prop);
+
+ if (actual_type == XA_INTEGER && actual_format == 8) {
+ result = new uint8_t[nitems];
+ memcpy(result, prop, nitems);
+ if (len)
+ *len = nitems;
+ }
+ XFree(prop);
+ return result;
+}
+
+MonitorInfo * read_edid_data(Display * disp, RROutput id) {
+ int len;
+ Atom edid_atom = XInternAtom(disp, "EDID", false);
+ uint8_t *edid = get_property(disp, id, edid_atom, &len);
+ if (!edid) {
+ edid_atom = XInternAtom(disp, "EDID_DATA", false);
+ edid = get_property(disp, id, edid_atom, &len);
+ }
+
+ MonitorInfo * result = 0;
+ if (edid) {
+ if (len % 128 == 0) {
+ result = decode_edid(edid);
+ }
+ delete[] edid;
+ }
+
+ return result;
+}
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