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Brightness (macOS): fix crashing when no external display connected

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This commit is contained in:
李通洲
2023-07-09 19:32:29 +08:00
parent da6dafe49a
commit 98079f583c
1 changed files with 26 additions and 18 deletions
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src/detection/brightness/brightness_apple.c
+26 -18
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@@ -53,33 +53,41 @@ const char* ffDetectBrightness(FFlist* result)
}
}
if (!instance.config.allowSlowOperations)
if (!instance.config.allowSlowOperations || displayServer->displays.length <= result->length)
return NULL;
// https://github.com/waydabber/m1ddc
// This only works for Apple Silicon and USB-C adapter connection ( but not HTMI )
FF_CFTYPE_AUTO_RELEASE IOAVServiceRef service = IOAVServiceCreate(kCFAllocatorDefault);
uint8_t i2cData[12] = { 0x82, 0x01, 0x00 };
i2cData[3] = 0x6e ^ i2cData[0] ^ i2cData[1] ^ i2cData[2] ^ i2cData[3];
for (uint32_t i = 0; i < 3; ++i)
if (service)
{
IOAVServiceWriteI2C(service, 0x37, 0x51, i2cData, 4);
usleep(10000);
}
uint8_t i2cData[12] = { 0x82, 0x01, 0x00 };
i2cData[3] = 0x6e ^ i2cData[0] ^ i2cData[1] ^ i2cData[2] ^ i2cData[3];
memset(i2cData, 0, sizeof(i2cData));
if (IOAVServiceReadI2C(service, 0x37, 0x51, i2cData, sizeof(i2cData)) == KERN_SUCCESS)
{
uint8_t current = i2cData[9], max = i2cData[7];
for (uint32_t i = 0; i < 3; ++i)
{
IOAVServiceWriteI2C(service, 0x37, 0x51, i2cData, 4);
usleep(10000);
}
FFBrightnessResult* brightness = (FFBrightnessResult*) ffListAdd(result);
brightness->value = (float) current * 100.f / max;
ffStrbufInit(&brightness->name);
memset(i2cData, 0, sizeof(i2cData));
if (IOAVServiceReadI2C(service, 0x37, 0x51, i2cData, sizeof(i2cData)) == KERN_SUCCESS)
{
if (i2cData[2] != 0x02 || i2cData[3] != 0x00)
return NULL;
uint8_t edid[128] = {};
if (IOAVServiceReadI2C(service, 0x50, 0x00, edid, sizeof(edid)) == KERN_SUCCESS)
getNameFromEdid(edid, &brightness->name);
uint32_t mh = i2cData[6], ml = i2cData[7], sh = i2cData[8], sl = i2cData[9];
uint32_t current = (mh << 8u) + ml;
uint32_t max = (sh << 8u) + sl;
FFBrightnessResult* brightness = (FFBrightnessResult*) ffListAdd(result);
brightness->value = (float) current * 100.f / max;
ffStrbufInit(&brightness->name);
uint8_t edid[128] = {};
if (IOAVServiceReadI2C(service, 0x50, 0x00, edid, sizeof(edid)) == KERN_SUCCESS)
getNameFromEdid(edid, &brightness->name);
}
}
return NULL;