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#include <mach/mach.h>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <IOKit/IOKitLib.h>
#if 0
set -e
sdk=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++ \
-Wall -fmessage-length=0 \
-arch armv6 -miphoneos-version-min=2.0 \
-isysroot "${sdk}" -I. -F"${sdk}"/System/Library/PrivateFrameworks \
-framework IOKit -framework IOMobileFramebuffer \
-o iomfsetgamma iomfsetgamma.c
ldid iomfsetgamma
exit 0
#endif
typedef void *IOMobileFramebufferRef;
kern_return_t IOMobileFramebufferOpen(io_service_t, mach_port_t, void *, IOMobileFramebufferRef *);
kern_return_t IOMobileFramebufferSetGammaTable(IOMobileFramebufferRef, void *);
kern_return_t (*$IOMobileFramebufferGetGammaTable)(IOMobileFramebufferRef, void *);
#define _assert(test) \
if (!(test)) { \
fprintf(stderr, "_assert(%s)\n", #test); \
exit(-1); \
}
int main(int argc, char *argv[]) {
if (argc != 4) {
fprintf(stderr, "usage: iomfsetgamma <red> <green> <blue>\n");
fprintf(stderr, " example: 1.00 0.78 0.64\n");
return 1;
}
unsigned rs = strtod(argv[1], NULL) * 0x100;
_assert(rs <= 0x100);
unsigned gs = strtod(argv[2], NULL) * 0x100;
_assert(gs <= 0x100);
unsigned bs = strtod(argv[3], NULL) * 0x100;
_assert(bs <= 0x100);
kern_return_t error;
mach_port_t self = mach_task_self();
io_service_t service = 0;
if (service == 0)
service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleCLCD"));
if (service == 0)
service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleH1CLCD"));
if (service == 0)
service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleM2CLCD"));
_assert(service != 0);
IOMobileFramebufferRef fb;
error = IOMobileFramebufferOpen(service, self, 0, &fb);
_assert(error == 0);
uint32_t data[0xc00 / sizeof(uint32_t)];
memset(data, 0, sizeof(data));
FILE *file = fopen("/tmp/.iomfgamma.dat", "rb");
if (file == NULL) {
$IOMobileFramebufferGetGammaTable = dlsym(RTLD_DEFAULT, "IOMobileFramebufferGetGammaTable");
_assert($IOMobileFramebufferGetGammaTable != NULL);
error = $IOMobileFramebufferGetGammaTable(fb, data);
_assert(error == 0);
file = fopen("/tmp/.iomfgamma.dat", "wb");
_assert(file != NULL);
fwrite(data, 1, sizeof(data), file);
fclose(file);
file = fopen("/tmp/.iomfgamma.dat", "rb");
_assert(file != NULL);
}
fread(data, 1, sizeof(data), file);
fclose(file);
size_t i;
for (i = 0; i != 256; ++i) {
int j = 255 - i;
int r = j * rs >> 8;
int g = j * gs >> 8;
int b = j * bs >> 8;
data[j + 0x000] = data[r + 0x000];
data[j + 0x100] = data[g + 0x100];
data[j + 0x200] = data[b + 0x200];
}
error = IOMobileFramebufferSetGammaTable(fb, data);
_assert(error == 0);
return 0;
}
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