1 | /* gcc -std=c99 -o brightness -framework Cocoa -framework DisplayServices -F/System/Library/PrivateFrameworks brightness.m */ |
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2 | |
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3 | #import <Foundation/Foundation.h> |
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4 | #include <crt_externs.h> |
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5 | |
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6 | @interface O3Manager : NSObject |
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7 | + (void)initialize; |
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8 | + (id)engineOfClass:(NSString *)cls forDisplayID:(CGDirectDisplayID)fp12; |
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9 | @end |
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10 | |
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11 | @protocol O3EngineWireProtocol |
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12 | @end |
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13 | |
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14 | @protocol BrightnessEngineWireProtocol <O3EngineWireProtocol> |
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15 | - (float)brightness; |
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16 | - (BOOL)setBrightness:(float)fp8; |
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17 | - (void)bumpBrightnessUp; |
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18 | - (void)bumpBrightnessDown; |
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19 | @end |
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20 | |
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21 | const int kMaxDisplays = 16; |
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22 | |
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23 | #define APP_NAME *(_NSGetProgname()) |
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24 | |
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25 | void errexit(const char *fmt, ...) { |
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26 | va_list ap; |
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27 | va_start(ap, fmt); |
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28 | fprintf(stderr, "%s: ", APP_NAME); |
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29 | vfprintf(stderr, fmt, ap); |
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30 | fprintf(stderr, "\n"); |
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31 | exit(1); |
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32 | } |
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33 | |
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34 | void usage() { |
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35 | fprintf(stderr, "usage: %s [-m|-d display] [-v] <brightness>\n", APP_NAME); |
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36 | fprintf(stderr, " or: %s -l [-v]\n", APP_NAME); |
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37 | exit(1); |
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38 | } |
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39 | |
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40 | int main(int argc, char * const argv[]) { |
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41 | if (argc == 1) |
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42 | usage(); |
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43 | |
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44 | BOOL verbose = NO; |
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45 | unsigned long displayToSet = 0; |
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46 | enum { ACTION_LIST, ACTION_SET_ALL, ACTION_SET_ONE } action = ACTION_SET_ALL; |
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47 | extern char *optarg; |
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48 | extern int optind; |
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49 | int ch; |
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50 | |
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51 | while ( (ch = getopt(argc, argv, "lmvd:")) != -1) { |
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52 | switch (ch) { |
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53 | case 'l': |
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54 | if (action == ACTION_SET_ONE) usage(); |
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55 | action = ACTION_LIST; |
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56 | break; |
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57 | case 'v': |
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58 | verbose = YES; |
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59 | break; |
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60 | case 'm': |
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61 | if (action != ACTION_SET_ALL) usage(); |
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62 | action = ACTION_SET_ONE; |
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63 | displayToSet = (unsigned long)CGMainDisplayID(); |
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64 | break; |
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65 | case 'd': |
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66 | if (action != ACTION_SET_ALL) usage(); |
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67 | action = ACTION_SET_ONE; |
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68 | errno = 0; |
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69 | displayToSet = strtoul(optarg, NULL, 0); |
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70 | if (errno == EINVAL || errno == ERANGE) |
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71 | errexit("display must be an integer index (0) or a hexadecimal ID (0x4270a80)"); |
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72 | break; |
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73 | default: usage(); |
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74 | } |
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75 | } |
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76 | |
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77 | argc -= optind; |
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78 | argv += optind; |
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79 | |
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80 | float brightness; |
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81 | if (action == ACTION_LIST) { |
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82 | if (argc > 0) usage(); |
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83 | } else { |
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84 | if (argc != 1) usage(); |
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85 | |
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86 | errno = 0; |
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87 | brightness = strtof(argv[0], NULL); |
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88 | if (errno == ERANGE) |
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89 | usage(); |
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90 | if (brightness < 0 || brightness > 1) |
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91 | errexit("brightness must be between 0 and 1"); |
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92 | } |
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93 | |
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94 | [[NSAutoreleasePool alloc] init]; |
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95 | [O3Manager initialize]; |
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96 | |
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97 | CGDirectDisplayID display[kMaxDisplays]; |
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98 | CGDisplayCount numDisplays; |
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99 | CGDisplayErr err; |
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100 | err = CGGetActiveDisplayList(kMaxDisplays, display, &numDisplays); |
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101 | if (err != CGDisplayNoErr) |
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102 | errexit("cannot get list of displays (error %d)\n", err); |
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103 | |
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104 | for (CGDisplayCount i = 0; i < numDisplays; ++i) { |
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105 | CGDirectDisplayID dspy = display[i]; |
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106 | CFDictionaryRef originalMode = CGDisplayCurrentMode(dspy); |
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107 | if (originalMode == NULL) |
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108 | continue; |
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109 | |
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110 | if (action == ACTION_LIST) { |
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111 | printf("display %d: ", i); |
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112 | if (CGMainDisplayID() == dspy) |
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113 | printf("main display, "); |
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114 | printf("ID 0x%x\n", (unsigned int)dspy); |
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115 | if (verbose) { |
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116 | puts([[(NSDictionary *)originalMode description] UTF8String]); |
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117 | } |
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118 | } |
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119 | |
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120 | if ([[(NSDictionary *)originalMode objectForKey: @"RefreshRate"] intValue] != 0) |
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121 | continue; |
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122 | |
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123 | id<BrightnessEngineWireProtocol> engine = |
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124 | [O3Manager engineOfClass: @"BrightnessEngine" forDisplayID: dspy]; |
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125 | |
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126 | switch (action) { |
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127 | case ACTION_SET_ONE: |
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128 | if ((CGDirectDisplayID)displayToSet != dspy && displayToSet != i) |
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129 | continue; |
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130 | case ACTION_SET_ALL: |
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131 | [engine setBrightness: brightness]; |
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132 | if (!verbose) continue; |
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133 | case ACTION_LIST: |
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134 | printf("display %d: brightness %f\n", i, [engine brightness]); |
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135 | } |
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136 | } |
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137 | return 0; |
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138 | } |
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