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| 1 /* ply-gamma.c - plymouth gamma setup via KMS |
| 2 * |
| 3 * Copyright (C) 2011, The Chromium OS Authors. |
| 4 * |
| 5 * This program is free software; you can redistribute it and/or modify |
| 6 * it under the terms of the GNU General Public License as published by |
| 7 * the Free Software Foundation; either version 2, or (at your option) |
| 8 * any later version. |
| 9 * |
| 10 * This program is distributed in the hope that it will be useful, |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 * GNU General Public License for more details. |
| 14 * |
| 15 * You should have received a copy of the GNU General Public License |
| 16 * along with this program; if not, write to the Free Software |
| 17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 18 * 02111-1307, USA. |
| 19 * |
| 20 */ |
| 21 |
| 22 #include "ply-gamma.h" |
| 23 |
| 24 #include <stdint.h> |
| 25 #include <stdio.h> |
| 26 #include <stdlib.h> |
| 27 #include <xf86drm.h> |
| 28 #include <xf86drmMode.h> |
| 29 |
| 30 static const int kInternalPanel = 1; |
| 31 |
| 32 typedef struct { |
| 33 uint16_t *red; |
| 34 uint16_t *green; |
| 35 uint16_t *blue; |
| 36 } GammaRamp; |
| 37 |
| 38 static GammaRamp* load_gamma_ramp(const char* file) { |
| 39 const int kGammaSize = 256; |
| 40 int i, r = 0; |
| 41 |
| 42 FILE* f = fopen(file, "rb"); |
| 43 if (!f) |
| 44 return NULL; |
| 45 |
| 46 unsigned char red[kGammaSize], green[kGammaSize], blue[kGammaSize]; |
| 47 |
| 48 r += fread(red, sizeof(red), 1, f); |
| 49 r += fread(green, sizeof(green), 1, f); |
| 50 r += fread(blue, sizeof(blue), 1, f); |
| 51 fclose(f); |
| 52 |
| 53 if (r != 3) |
| 54 return NULL; |
| 55 |
| 56 GammaRamp* ramp = (GammaRamp*)malloc(sizeof(GammaRamp)); |
| 57 ramp->red = (uint16_t*)malloc(sizeof(uint16_t) * kGammaSize); |
| 58 ramp->green = (uint16_t*)malloc(sizeof(uint16_t) * kGammaSize); |
| 59 ramp->blue = (uint16_t*)malloc(sizeof(uint16_t) * kGammaSize); |
| 60 |
| 61 for(i = 0; i < kGammaSize; ++i) { |
| 62 ramp->red[i] = (uint16_t)red[i] * 257; |
| 63 ramp->green[i] = (uint16_t)green[i] * 257; |
| 64 ramp->blue[i] = (uint16_t)blue[i] * 257; |
| 65 } |
| 66 |
| 67 return ramp; |
| 68 } |
| 69 |
| 70 static void free_gamma_ramp(GammaRamp* ramp) { |
| 71 free(ramp->red); |
| 72 free(ramp->green); |
| 73 free(ramp->blue); |
| 74 free(ramp); |
| 75 } |
| 76 |
| 77 bool ply_gamma_set(const char* file) { |
| 78 int r; |
| 79 drmModeCrtcPtr mode; |
| 80 GammaRamp* ramp; |
| 81 |
| 82 ramp = load_gamma_ramp(file); |
| 83 |
| 84 if (!ramp) { |
| 85 fprintf(stderr, "Unable to load gamma ramp\n"); |
| 86 return false; |
| 87 } |
| 88 |
| 89 int fd = drmOpen("i915", NULL); |
| 90 if (fd < 0) { |
| 91 fprintf(stderr, "Unable to open i915 drm\n"); |
| 92 return false; |
| 93 } |
| 94 |
| 95 drmModeRes *resources = drmModeGetResources(fd); |
| 96 if (!resources) { |
| 97 fprintf(stderr, "Unable to get mode resources\n"); |
| 98 drmClose(fd); |
| 99 return false; |
| 100 } |
| 101 |
| 102 mode = drmModeGetCrtc(fd, resources->crtcs[kInternalPanel]); |
| 103 r = drmModeCrtcSetGamma(fd, |
| 104 mode->crtc_id, |
| 105 mode->gamma_size, |
| 106 ramp->red, |
| 107 ramp->green, |
| 108 ramp->blue); |
| 109 |
| 110 drmModeFreeResources(resources); |
| 111 drmClose(fd); |
| 112 free_gamma_ramp(ramp); |
| 113 return r >= 0; |
| 114 } |
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