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#include "brightness.h"
#include "detection/displayserver/displayserver.h"
#include "common/debug.h"
#include "common/library.h"
#include "common/mallocHelper.h"
#include "common/windows/wmi.h"
#include "common/windows/unicode.h"
#include <inttypes.h>
#include <winternl.h>
#include <windows.h>
NTSYSAPI NTSTATUS WINAPI GetPhysicalMonitors(
_In_ UNICODE_STRING* pstrDeviceName,
_In_ DWORD dwPhysicalMonitorArraySize,
_Out_ DWORD* pdwNumPhysicalMonitorHandlesInArray,
_Out_ HANDLE* phPhysicalMonitorArray);
typedef enum _MC_VCP_CODE_TYPE {
MC_MOMENTARY,
MC_SET_PARAMETER
} MC_VCP_CODE_TYPE,
*LPMC_VCP_CODE_TYPE;
NTSYSAPI NTSTATUS WINAPI DDCCIGetVCPFeature(
_In_ HANDLE hMonitor,
_In_ DWORD dwVCPCode,
_Out_opt_ LPMC_VCP_CODE_TYPE pvct,
_Out_ DWORD* pdwCurrentValue,
_Out_opt_ DWORD* pdwMaximumValue);
NTSYSAPI NTSTATUS WINAPI DestroyPhysicalMonitorInternal(
_In_ HANDLE hMonitor);
NTSTATUS WINAPI GetPhysicalMonitorDescription(
_In_ HANDLE hMonitor,
_In_ DWORD dwPhysicalMonitorDescriptionSizeInChars,
_Out_ LPWSTR szPhysicalMonitorDescription);
static const char* detectWithWmi(FFlist* result) {
FF_DEBUG("WMI: start detection");
// https://github.com/tpn/winsdk-10/blob/master/Include/10.0.16299.0/km/wmicore.mof#L21200
const GUID WmiMonitorBrightnessGuid = {
0xd43412ac, 0x67f9, 0x4fbb, { 0xa0, 0x81, 0x17, 0x52, 0xa2, 0xc3, 0x3e, 0x84 }
};
FF_AUTO_CLOSE_WMI_BLOCK HANDLE hBlock = NULL;
ULONG status = WmiOpenBlock(&WmiMonitorBrightnessGuid, WMIGUID_QUERY, &hBlock);
if (status != 0) {
FF_DEBUG("WMI: WmiOpenBlock failed: %s", ffDebugWin32Error(status));
return "WmiOpenBlock() failed";
}
ULONG bufferSize = 0;
status = WmiQueryAllDataW(hBlock, &bufferSize, NULL);
if (status != ERROR_SUCCESS && status != ERROR_INSUFFICIENT_BUFFER) {
FF_DEBUG("WMI: first WmiQueryAllDataW failed, bufferSize=%lu: %s", bufferSize, ffDebugWin32Error(status));
return "WmiQueryAllDataW() failed";
}
FF_DEBUG("WMI: initial query bufferSize=%lu", bufferSize);
if (bufferSize == 0) {
FF_DEBUG("WMI: WmiQueryAllDataW returned empty buffer");
return "WmiQueryAllDataW() returned no data";
}
FF_AUTO_FREE PWNODE_ALL_DATA pAllData = (PWNODE_ALL_DATA) malloc(bufferSize);
status = WmiQueryAllDataW(hBlock, &bufferSize, pAllData);
if (status != ERROR_SUCCESS) {
FF_DEBUG("WMI: second WmiQueryAllDataW failed, bufferSize=%lu: %s", bufferSize, ffDebugWin32Error(status));
return "WmiQueryAllDataW() failed";
}
if (bufferSize < sizeof(WNODE_ALL_DATA)) {
FF_DEBUG("WMI: insufficient buffer for WNODE_ALL_DATA, bufferSize=%lu", bufferSize);
return "WmiQueryAllDataW() returned insufficient data for WNODE_ALL_DATA";
}
FF_DEBUG("WMI: instanceCount=%lu, flags=0x%lX", pAllData->InstanceCount, pAllData->WnodeHeader.Flags);
PULONG pNameOffsets = (PULONG) ((PUCHAR) pAllData + pAllData->OffsetInstanceNameOffsets);
for (ULONG i = 0; i < pAllData->InstanceCount; i++) {
ULONG dataOffset = 0;
ULONG dataLength = 0;
if (pAllData->WnodeHeader.Flags & WNODE_FLAG_FIXED_INSTANCE_SIZE) {
dataLength = pAllData->FixedInstanceSize;
dataOffset = pAllData->DataBlockOffset + i * dataLength;
} else {
dataOffset = pAllData->OffsetInstanceDataAndLength[i].OffsetInstanceData;
dataLength = pAllData->OffsetInstanceDataAndLength[i].LengthInstanceData;
}
if (dataLength == 0 || dataOffset >= bufferSize || dataLength > bufferSize - dataOffset) {
FF_DEBUG("WMI: skip invalid instance %lu (dataOffset=%lu, dataLength=%lu, bufferSize=%lu)", i, dataOffset, dataLength, bufferSize);
continue;
}
USHORT nameCharsCount = *(PUSHORT) ((PUCHAR) pAllData + pNameOffsets[i]) / sizeof(WCHAR);
PCWSTR pNameChars = (PCWSTR) ((PUCHAR) pAllData + (pNameOffsets[i] + sizeof(USHORT)));
PUCHAR pDataBlock = (PUCHAR) pAllData + dataOffset;
UCHAR currentBrightness = pDataBlock[0];
FFBrightnessResult* brightness = FF_LIST_ADD(FFBrightnessResult, *result);
brightness->max = 100;
brightness->min = 0;
brightness->current = currentBrightness;
brightness->builtin = true;
ffStrbufInitNWS(&brightness->name, nameCharsCount, pNameChars);
ffStrbufSubstrAfterFirstC(&brightness->name, '\\');
ffStrbufSubstrBeforeFirstC(&brightness->name, '\\');
FF_DEBUG("WMI: detected builtin display '%s', current=%u", brightness->name.chars, (unsigned) currentBrightness);
}
FF_DEBUG("WMI: finished detection, total results=%u", result->length);
return NULL;
}
static const char* detectWithDdcci(const FFDisplayServerResult* displayServer, FFlist* result) {
FF_DEBUG("DDC/CI: start detection, displayCount=%u", displayServer->displays.length);
void* gdi32 = ffLibraryGetModule(L"gdi32.dll");
if (!gdi32) {
FF_DEBUG("DDC/CI: failed to load gdi32.dll");
return "ffLibraryGetModule(gdi32.dll) failed";
}
FF_LIBRARY_LOAD_SYMBOL_MESSAGE(gdi32, GetPhysicalMonitors)
FF_LIBRARY_LOAD_SYMBOL_MESSAGE(gdi32, DDCCIGetVCPFeature)
FF_LIBRARY_LOAD_SYMBOL_MESSAGE(gdi32, DestroyPhysicalMonitorInternal)
FF_LIST_FOR_EACH (FFDisplayResult, display, displayServer->displays) {
if (display->type == FF_DISPLAY_TYPE_BUILTIN) {
FF_DEBUG("DDC/CI: skip builtin display id=%" PRIu64, display->id);
continue;
}
MONITORINFOEXW mi;
mi.cbSize = sizeof(mi);
if (!GetMonitorInfoW((HMONITOR) (uintptr_t) display->id, (LPMONITORINFO) &mi)) {
FF_DEBUG("DDC/CI: GetMonitorInfoW failed for display id=%" PRIu64 ": %s", display->id, ffDebugWin32Error(GetLastError()));
continue;
}
UNICODE_STRING deviceName = {
.Length = (USHORT) (wcslen(mi.szDevice) * sizeof(wchar_t)),
.MaximumLength = 0,
.Buffer = mi.szDevice,
};
HANDLE physicalMonitor;
DWORD monitorCount = 0;
NTSTATUS monitorStatus = ffGetPhysicalMonitors(&deviceName, 1, &monitorCount, &physicalMonitor);
if (NT_SUCCESS(monitorStatus) && monitorCount >= 1) {
DWORD curr = 0, max = 0;
if (NT_SUCCESS(ffDDCCIGetVCPFeature(physicalMonitor, FF_DDC_CI_LUMINANCE_OPCODE, NULL, &curr, &max))) {
FFBrightnessResult* brightness = FF_LIST_ADD(FFBrightnessResult, *result);
if (display->name.length > 0) {
ffStrbufInitCopy(&brightness->name, &display->name);
} else {
FF_LIBRARY_LOAD_SYMBOL_LAZY(gdi32, GetPhysicalMonitorDescription)
if (ffGetPhysicalMonitorDescription) {
wchar_t description[128 /*MUST be PHYSICAL_MONITOR_DESCRIPTION_SIZE*/];
if (NT_SUCCESS(ffGetPhysicalMonitorDescription(physicalMonitor, ARRAY_SIZE(description), description))) {
ffStrbufInitWS(&brightness->name, description);
}
}
if (brightness->name.length == 0) {
ffStrbufSetNWS(&brightness->name, deviceName.Length / 2, deviceName.Buffer);
}
}
brightness->max = max;
brightness->min = 0;
brightness->current = curr;
brightness->builtin = false;
FF_DEBUG("DDC/CI: detected external display '%s', current=%u, max=%u", brightness->name.chars, (unsigned) curr, (unsigned) max);
} else {
FF_DEBUG("DDC/CI: DDCCIGetVCPFeature failed for monitor '%ls': %s", deviceName.Buffer, ffDebugWin32Error(GetLastError()));
}
ffDestroyPhysicalMonitorInternal(physicalMonitor);
} else {
FF_DEBUG("DDC/CI: GetPhysicalMonitors failed for '%ls', status=0x%08X, monitorCount=%lu, error=%s", deviceName.Buffer, (unsigned) monitorStatus, monitorCount, ffDebugWin32Error(GetLastError()));
}
}
FF_DEBUG("DDC/CI: finished detection, total results=%u", result->length);
return NULL;
}
static bool hasBuiltinDisplay(const FFDisplayServerResult* displayServer) {
FF_LIST_FOR_EACH (FFDisplayResult, display, displayServer->displays) {
if (display->type == FF_DISPLAY_TYPE_BUILTIN || display->type == FF_DISPLAY_TYPE_UNKNOWN) {
return true;
}
}
return false;
}
const char* ffDetectBrightness(FF_A_UNUSED FFBrightnessOptions* options, FFlist* result) {
const FFDisplayServerResult* displayServer = ffConnectDisplayServer();
FF_DEBUG("start, displayCount=%u", displayServer->displays.length);
if (hasBuiltinDisplay(displayServer)) {
FF_DEBUG("builtin display detected, trying WMI");
detectWithWmi(result);
}
if (options->ddcciSleep != FF_BRIGHTNESS_DDCCI_SLEEP_SKIP && result->length < displayServer->displays.length) {
FF_DEBUG("resultCount=%u < displayCount=%u, trying DDC/CI", result->length, displayServer->displays.length);
detectWithDdcci(displayServer, result);
}
FF_DEBUG("finished, resultCount=%u", result->length);
return NULL;
}
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