diff options
Diffstat (limited to 'src/detection/brightness/brightness_windows.c')
| -rw-r--r-- | src/detection/brightness/brightness_windows.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/detection/brightness/brightness_windows.c b/src/detection/brightness/brightness_windows.c new file mode 100644 index 0000000..70b7f01 --- /dev/null +++ b/src/detection/brightness/brightness_windows.c @@ -0,0 +1,223 @@ +#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; +} |