IddCx Framework

// Source: GetIddCx/IddCxVersionQuery.cpp
std::map<DWORD, IddCxVersionInfo> versionMap = {
    {26100, {"Windows 11 24H2", "1.10", 0x1A80}},
    {22631, {"Windows 11 23H2", "1.10", 0x1A00}},
    {22621, {"Windows 11 22H2", "1.9", 0x1900}},
    {22000, {"Windows 11 21H2", "1.8", 0x1800}},
    {19041, {"Windows 10 20H1", "1.5", 0x1500}},
    // ... additional versions
};

#include <IddCx.h>  // Core IddCx framework

// Key callback events:
EVT_IDD_CX_ADAPTER_INIT_FINISHED
EVT_IDD_CX_ADAPTER_COMMIT_MODES
EVT_IDD_CX_MONITOR_QUERY_TARGET_MODES
EVT_IDD_CX_MONITOR_ASSIGN_SWAPCHAIN
EVT_IDD_CX_MONITOR_SET_DEFAULT_HDR_METADATA
EVT_IDD_CX_MONITOR_SET_GAMMA_RAMP

IDDCX_ADAPTER m_Adapter;

// Initialize adapter
IDDCX_ADAPTER_CAPS adapterCaps = {};
adapterCaps.Size = sizeof(adapterCaps);
adapterCaps.MaxMonitorsSupported = 5;  // Up to 5 virtual monitors
adapterCaps.EndPointDiagnostics.Size = sizeof(adapterCaps.EndPointDiagnostics);

IddCxAdapterInitAsync(&adapterInitIn, &adapterInitOut);

IDDCX_MONITOR m_Monitor;

// Create monitor with EDID
IDDCX_MONITOR_CREATE monitorCreate = {};
monitorCreate.pEdidBlock = edidData;
monitorCreate.EdidBlockSize = edidSize;

IddCxMonitorCreate(m_Adapter, &monitorCreate, &m_Monitor);

class SwapChainProcessor {
    IDDCX_SWAPCHAIN m_hSwapChain;
    
    void Run() {
        // Acquire frame from Windows compositor
        IddCxSwapChainReleaseAndAcquireBuffer(m_hSwapChain, &acquireBuffer);
        
        // Process the frame buffer
        ProcessFrame(acquireBuffer.pSurface);
        
        // Return buffer to IddCx
        IddCxSwapChainFinishedProcessingFrame(m_hSwapChain);
    }
};

EVT_IDD_CX_MONITOR_SET_DEFAULT_HDR_METADATA 
    VirtualDisplayDriverEvtIddCxMonitorSetDefaultHdrMetadata;

// HDR metadata structure
struct VddHdrMetadata {
    UINT16 display_primaries_x[3];  // RGB chromaticity
    UINT16 display_primaries_y[3];
    UINT16 white_point_x;
    UINT16 white_point_y;
    UINT32 max_display_mastering_luminance;  // 0.0001 cd/m² units
    UINT32 min_display_mastering_luminance;
    UINT16 max_content_light_level;
    UINT16 max_frame_avg_light_level;
};

EVT_IDD_CX_MONITOR_SET_GAMMA_RAMP 
    VirtualDisplayDriverEvtIddCxMonitorSetGammaRamp;

struct VddGammaRamp {
    FLOAT gamma;                    // Gamma value (e.g., 2.4)
    wstring colorSpace;             // sRGB, DCI-P3, Rec.2020
    FLOAT matrix[3][4];             // Color space transform
};

// Cursor capabilities
IDDCX_CURSOR_CAPS cursorCaps = {};
cursorCaps.AlphaCursorSupport = TRUE;
cursorCaps.MaxX = 128;
cursorCaps.MaxY = 128;
cursorCaps.XorCursorSupport = IDDCX_XOR_CURSOR_SUPPORT_FULL;

// From GetIddCx utility source
DWORD GetWindowsBuildNumber() {
    HMODULE hMod = GetModuleHandleW(L"ntdll.dll");
    RtlGetVersionPtr RtlGetVersion = 
        (RtlGetVersionPtr)GetProcAddress(hMod, "RtlGetVersion");
    
    RTL_OSVERSIONINFOW rovi = { 0 };
    rovi.dwOSVersionInfoSize = sizeof(rovi);
    RtlGetVersion(&rovi);
    
    return rovi.dwBuildNumber;
}

IddCxVersionInfo GetIddCxVersion(DWORD buildNumber) {
    // Maps build numbers to IddCx versions
    // Returns version capabilities
}