diff options
Diffstat (limited to 'drivers/media/platform/vivid/vivid-tpg-colors.c')
| -rw-r--r-- | drivers/media/platform/vivid/vivid-tpg-colors.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/drivers/media/platform/vivid/vivid-tpg-colors.c b/drivers/media/platform/vivid/vivid-tpg-colors.c new file mode 100644 index 000000000000..2adddc0ca662 --- /dev/null +++ b/drivers/media/platform/vivid/vivid-tpg-colors.c @@ -0,0 +1,310 @@ +/* + * vivid-color.c - A table that converts colors to various colorspaces + * + * The test pattern generator uses the tpg_colors for its test patterns. + * For testing colorspaces the first 8 colors of that table need to be + * converted to their equivalent in the target colorspace. + * + * The tpg_csc_colors[] table is the result of that conversion and since + * it is precalculated the colorspace conversion is just a simple table + * lookup. + * + * This source also contains the code used to generate the tpg_csc_colors + * table. Run the following command to compile it: + * + * gcc vivid-colors.c -DCOMPILE_APP -o gen-colors -lm + * + * and run the utility. + * + * Note that the converted colors are in the range 0x000-0xff0 (so times 16) + * in order to preserve precision. + * + * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. + * + * This program is free software; you may redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * 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 + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * 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. + */ + +#include <linux/videodev2.h> + +#include "vivid-tpg-colors.h" + +/* sRGB colors with range [0-255] */ +const struct color tpg_colors[TPG_COLOR_MAX] = { + /* + * Colors to test colorspace conversion: converting these colors + * to other colorspaces will never lead to out-of-gamut colors. + */ + { 191, 191, 191 }, /* TPG_COLOR_CSC_WHITE */ + { 191, 191, 50 }, /* TPG_COLOR_CSC_YELLOW */ + { 50, 191, 191 }, /* TPG_COLOR_CSC_CYAN */ + { 50, 191, 50 }, /* TPG_COLOR_CSC_GREEN */ + { 191, 50, 191 }, /* TPG_COLOR_CSC_MAGENTA */ + { 191, 50, 50 }, /* TPG_COLOR_CSC_RED */ + { 50, 50, 191 }, /* TPG_COLOR_CSC_BLUE */ + { 50, 50, 50 }, /* TPG_COLOR_CSC_BLACK */ + + /* 75% colors */ + { 191, 191, 0 }, /* TPG_COLOR_75_YELLOW */ + { 0, 191, 191 }, /* TPG_COLOR_75_CYAN */ + { 0, 191, 0 }, /* TPG_COLOR_75_GREEN */ + { 191, 0, 191 }, /* TPG_COLOR_75_MAGENTA */ + { 191, 0, 0 }, /* TPG_COLOR_75_RED */ + { 0, 0, 191 }, /* TPG_COLOR_75_BLUE */ + + /* 100% colors */ + { 255, 255, 255 }, /* TPG_COLOR_100_WHITE */ + { 255, 255, 0 }, /* TPG_COLOR_100_YELLOW */ + { 0, 255, 255 }, /* TPG_COLOR_100_CYAN */ + { 0, 255, 0 }, /* TPG_COLOR_100_GREEN */ + { 255, 0, 255 }, /* TPG_COLOR_100_MAGENTA */ + { 255, 0, 0 }, /* TPG_COLOR_100_RED */ + { 0, 0, 255 }, /* TPG_COLOR_100_BLUE */ + { 0, 0, 0 }, /* TPG_COLOR_100_BLACK */ + + { 0, 0, 0 }, /* TPG_COLOR_RANDOM placeholder */ +}; + +#ifndef COMPILE_APP + +/* Generated table */ +const struct color16 tpg_csc_colors[V4L2_COLORSPACE_SRGB + 1][TPG_COLOR_CSC_BLACK + 1] = { + [V4L2_COLORSPACE_SMPTE170M][0] = { 2953, 2939, 2939 }, + [V4L2_COLORSPACE_SMPTE170M][1] = { 2954, 2963, 585 }, + [V4L2_COLORSPACE_SMPTE170M][2] = { 84, 2967, 2937 }, + [V4L2_COLORSPACE_SMPTE170M][3] = { 93, 2990, 575 }, + [V4L2_COLORSPACE_SMPTE170M][4] = { 3030, 259, 2933 }, + [V4L2_COLORSPACE_SMPTE170M][5] = { 3031, 406, 557 }, + [V4L2_COLORSPACE_SMPTE170M][6] = { 544, 428, 2931 }, + [V4L2_COLORSPACE_SMPTE170M][7] = { 551, 547, 547 }, + [V4L2_COLORSPACE_SMPTE240M][0] = { 2926, 2926, 2926 }, + [V4L2_COLORSPACE_SMPTE240M][1] = { 2926, 2926, 857 }, + [V4L2_COLORSPACE_SMPTE240M][2] = { 1594, 2901, 2901 }, + [V4L2_COLORSPACE_SMPTE240M][3] = { 1594, 2901, 774 }, + [V4L2_COLORSPACE_SMPTE240M][4] = { 2484, 618, 2858 }, + [V4L2_COLORSPACE_SMPTE240M][5] = { 2484, 618, 617 }, + [V4L2_COLORSPACE_SMPTE240M][6] = { 507, 507, 2832 }, + [V4L2_COLORSPACE_SMPTE240M][7] = { 507, 507, 507 }, + [V4L2_COLORSPACE_REC709][0] = { 2939, 2939, 2939 }, + [V4L2_COLORSPACE_REC709][1] = { 2939, 2939, 547 }, + [V4L2_COLORSPACE_REC709][2] = { 547, 2939, 2939 }, + [V4L2_COLORSPACE_REC709][3] = { 547, 2939, 547 }, + [V4L2_COLORSPACE_REC709][4] = { 2939, 547, 2939 }, + [V4L2_COLORSPACE_REC709][5] = { 2939, 547, 547 }, + [V4L2_COLORSPACE_REC709][6] = { 547, 547, 2939 }, + [V4L2_COLORSPACE_REC709][7] = { 547, 547, 547 }, + [V4L2_COLORSPACE_470_SYSTEM_M][0] = { 2894, 2988, 2808 }, + [V4L2_COLORSPACE_470_SYSTEM_M][1] = { 2847, 3070, 843 }, + [V4L2_COLORSPACE_470_SYSTEM_M][2] = { 1656, 2962, 2783 }, + [V4L2_COLORSPACE_470_SYSTEM_M][3] = { 1572, 3045, 763 }, + [V4L2_COLORSPACE_470_SYSTEM_M][4] = { 2477, 229, 2743 }, + [V4L2_COLORSPACE_470_SYSTEM_M][5] = { 2422, 672, 614 }, + [V4L2_COLORSPACE_470_SYSTEM_M][6] = { 725, 63, 2718 }, + [V4L2_COLORSPACE_470_SYSTEM_M][7] = { 534, 561, 509 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][0] = { 2939, 2939, 2939 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][1] = { 2939, 2939, 621 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][2] = { 786, 2939, 2939 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][3] = { 786, 2939, 621 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][4] = { 2879, 547, 2923 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][5] = { 2879, 547, 547 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][6] = { 547, 547, 2923 }, + [V4L2_COLORSPACE_470_SYSTEM_BG][7] = { 547, 547, 547 }, + [V4L2_COLORSPACE_SRGB][0] = { 3056, 3056, 3056 }, + [V4L2_COLORSPACE_SRGB][1] = { 3056, 3056, 800 }, + [V4L2_COLORSPACE_SRGB][2] = { 800, 3056, 3056 }, + [V4L2_COLORSPACE_SRGB][3] = { 800, 3056, 800 }, + [V4L2_COLORSPACE_SRGB][4] = { 3056, 800, 3056 }, + [V4L2_COLORSPACE_SRGB][5] = { 3056, 800, 800 }, + [V4L2_COLORSPACE_SRGB][6] = { 800, 800, 3056 }, + [V4L2_COLORSPACE_SRGB][7] = { 800, 800, 800 }, +}; + +#else + +/* This code generates the table above */ + +#include <math.h> +#include <stdio.h> +#include <stdlib.h> + +static const double rec709_to_ntsc1953[3][3] = { + { 0.6698, 0.2678, 0.0323 }, + { 0.0185, 1.0742, -0.0603 }, + { 0.0162, 0.0432, 0.8551 } +}; + +static const double rec709_to_ebu[3][3] = { + { 0.9578, 0.0422, 0 }, + { 0 , 1 , 0 }, + { 0 , 0.0118, 0.9882 } +}; + +static const double rec709_to_170m[3][3] = { + { 1.0654, -0.0554, -0.0010 }, + { -0.0196, 1.0364, -0.0167 }, + { 0.0016, 0.0044, 0.9940 } +}; + +static const double rec709_to_240m[3][3] = { + { 0.7151, 0.2849, 0 }, + { 0.0179, 0.9821, 0 }, + { 0.0177, 0.0472, 0.9350 } +}; + + +static void mult_matrix(double *r, double *g, double *b, const double m[3][3]) +{ + double ir, ig, ib; + + ir = m[0][0] * (*r) + m[0][1] * (*g) + m[0][2] * (*b); + ig = m[1][0] * (*r) + m[1][1] * (*g) + m[1][2] * (*b); + ib = m[2][0] * (*r) + m[2][1] * (*g) + m[2][2] * (*b); + *r = ir; + *g = ig; + *b = ib; +} + +static double transfer_srgb_to_rgb(double v) +{ + return (v <= 0.03928) ? v / 12.92 : pow((v + 0.055) / 1.055, 2.4); +} + +static double transfer_rgb_to_smpte240m(double v) +{ + return (v <= 0.0228) ? v * 4.0 : 1.1115 * pow(v, 0.45) - 0.1115; +} + +static double transfer_rgb_to_rec709(double v) +{ + return (v < 0.018) ? v * 4.5 : 1.099 * pow(v, 0.45) - 0.099; +} + +static double transfer_srgb_to_rec709(double v) +{ + return transfer_rgb_to_rec709(transfer_srgb_to_rgb(v)); +} + +static void csc(enum v4l2_colorspace colorspace, double *r, double *g, double *b) +{ + /* Convert the primaries of Rec. 709 Linear RGB */ + switch (colorspace) { + case V4L2_COLORSPACE_SMPTE240M: + *r = transfer_srgb_to_rgb(*r); + *g = transfer_srgb_to_rgb(*g); + *b = transfer_srgb_to_rgb(*b); + mult_matrix(r, g, b, rec709_to_240m); + break; + case V4L2_COLORSPACE_SMPTE170M: + *r = transfer_srgb_to_rgb(*r); + *g = transfer_srgb_to_rgb(*g); + *b = transfer_srgb_to_rgb(*b); + mult_matrix(r, g, b, rec709_to_170m); + break; + case V4L2_COLORSPACE_470_SYSTEM_BG: + *r = transfer_srgb_to_rgb(*r); + *g = transfer_srgb_to_rgb(*g); + *b = transfer_srgb_to_rgb(*b); + mult_matrix(r, g, b, rec709_to_ebu); + break; + case V4L2_COLORSPACE_470_SYSTEM_M: + *r = transfer_srgb_to_rgb(*r); + *g = transfer_srgb_to_rgb(*g); + *b = transfer_srgb_to_rgb(*b); + mult_matrix(r, g, b, rec709_to_ntsc1953); + break; + case V4L2_COLORSPACE_SRGB: + case V4L2_COLORSPACE_REC709: + default: + break; + } + + *r = ((*r) < 0) ? 0 : (((*r) > 1) ? 1 : (*r)); + *g = ((*g) < 0) ? 0 : (((*g) > 1) ? 1 : (*g)); + *b = ((*b) < 0) ? 0 : (((*b) > 1) ? 1 : (*b)); + + /* Encode to gamma corrected colorspace */ + switch (colorspace) { + case V4L2_COLORSPACE_SMPTE240M: + *r = transfer_rgb_to_smpte240m(*r); + *g = transfer_rgb_to_smpte240m(*g); + *b = transfer_rgb_to_smpte240m(*b); + break; + case V4L2_COLORSPACE_SMPTE170M: + case V4L2_COLORSPACE_470_SYSTEM_M: + case V4L2_COLORSPACE_470_SYSTEM_BG: + *r = transfer_rgb_to_rec709(*r); + *g = transfer_rgb_to_rec709(*g); + *b = transfer_rgb_to_rec709(*b); + break; + case V4L2_COLORSPACE_SRGB: + break; + case V4L2_COLORSPACE_REC709: + default: + *r = transfer_srgb_to_rec709(*r); + *g = transfer_srgb_to_rec709(*g); + *b = transfer_srgb_to_rec709(*b); + break; + } +} + +int main(int argc, char **argv) +{ + static const unsigned colorspaces[] = { + 0, + V4L2_COLORSPACE_SMPTE170M, + V4L2_COLORSPACE_SMPTE240M, + V4L2_COLORSPACE_REC709, + 0, + V4L2_COLORSPACE_470_SYSTEM_M, + V4L2_COLORSPACE_470_SYSTEM_BG, + 0, + V4L2_COLORSPACE_SRGB, + }; + static const char * const colorspace_names[] = { + "", + "V4L2_COLORSPACE_SMPTE170M", + "V4L2_COLORSPACE_SMPTE240M", + "V4L2_COLORSPACE_REC709", + "", + "V4L2_COLORSPACE_470_SYSTEM_M", + "V4L2_COLORSPACE_470_SYSTEM_BG", + "", + "V4L2_COLORSPACE_SRGB", + }; + int i; + int c; + + printf("/* Generated table */\n"); + printf("const struct color16 tpg_csc_colors[V4L2_COLORSPACE_SRGB + 1][TPG_COLOR_CSC_BLACK + 1] = {\n"); + for (c = 0; c <= V4L2_COLORSPACE_SRGB; c++) { + for (i = 0; i <= TPG_COLOR_CSC_BLACK; i++) { + double r, g, b; + + if (colorspaces[c] == 0) + continue; + + r = tpg_colors[i].r / 255.0; + g = tpg_colors[i].g / 255.0; + b = tpg_colors[i].b / 255.0; + + csc(c, &r, &g, &b); + + printf("\t[%s][%d] = { %d, %d, %d },\n", colorspace_names[c], i, + (int)(r * 4080), (int)(g * 4080), (int)(b * 4080)); + } + } + printf("};\n\n"); + return 0; +} + +#endif |