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1 //=============================================================================
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2 //
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3 // multimon.h -- Stub module that fakes multiple monitor apis on Win32 OSes
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4 // without them.
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5 //
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6 // By using this header your code will get back default values from
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7 // GetSystemMetrics() for new metrics, and the new multimonitor APIs
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8 // will act like only one display is present on a Win32 OS without
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9 // multimonitor APIs.
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10 //
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11 // Exactly one source must include this with COMPILE_MULTIMON_STUBS defined.
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12 //
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13 // Copyright (c) Microsoft Corporation. All rights reserved.
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14 //
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15 //=============================================================================
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16
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17 #ifdef __cplusplus
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18 extern "C" { // Assume C declarations for C++
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19 #endif // __cplusplus
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20
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21 //
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22 // If we are building with Win95/NT4 headers, we need to declare
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23 // the multimonitor-related metrics and APIs ourselves.
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24 //
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25 #ifndef SM_CMONITORS
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26
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27 #define SM_XVIRTUALSCREEN 76
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28 #define SM_YVIRTUALSCREEN 77
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29 #define SM_CXVIRTUALSCREEN 78
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30 #define SM_CYVIRTUALSCREEN 79
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31 #define SM_CMONITORS 80
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32 #define SM_SAMEDISPLAYFORMAT 81
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33
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34 // HMONITOR is already declared if WINVER >= 0x0500 in windef.h
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35 // This is for components built with an older version number.
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36 //
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37 #if !defined(HMONITOR_DECLARED) && (WINVER < 0x0500)
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38 DECLARE_HANDLE(HMONITOR);
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39 #define HMONITOR_DECLARED
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40 #endif
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41
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42 #define MONITOR_DEFAULTTONULL 0x00000000
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43 #define MONITOR_DEFAULTTOPRIMARY 0x00000001
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44 #define MONITOR_DEFAULTTONEAREST 0x00000002
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45
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46 #define MONITORINFOF_PRIMARY 0x00000001
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47
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48 typedef struct tagMONITORINFO
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49 {
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50 DWORD cbSize;
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51 RECT rcMonitor;
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52 RECT rcWork;
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53 DWORD dwFlags;
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54 } MONITORINFO, *LPMONITORINFO;
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55
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56 #ifndef CCHDEVICENAME
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57 #define CCHDEVICENAME 32
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58 #endif
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59
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60 #ifdef __cplusplus
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61 typedef struct tagMONITORINFOEXA : public tagMONITORINFO
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62 {
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63 CHAR szDevice[CCHDEVICENAME];
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64 } MONITORINFOEXA, *LPMONITORINFOEXA;
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65 typedef struct tagMONITORINFOEXW : public tagMONITORINFO
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66 {
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67 WCHAR szDevice[CCHDEVICENAME];
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68 } MONITORINFOEXW, *LPMONITORINFOEXW;
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69 #ifdef UNICODE
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70 typedef MONITORINFOEXW MONITORINFOEX;
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71 typedef LPMONITORINFOEXW LPMONITORINFOEX;
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72 #else
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73 typedef MONITORINFOEXA MONITORINFOEX;
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74 typedef LPMONITORINFOEXA LPMONITORINFOEX;
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75 #endif // UNICODE
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76 #else // ndef __cplusplus
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77 typedef struct tagMONITORINFOEXA
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78 {
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79 MONITORINFO;
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80 CHAR szDevice[CCHDEVICENAME];
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81 } MONITORINFOEXA, *LPMONITORINFOEXA;
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82 typedef struct tagMONITORINFOEXW
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83 {
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84 MONITORINFO;
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85 WCHAR szDevice[CCHDEVICENAME];
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86 } MONITORINFOEXW, *LPMONITORINFOEXW;
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87 #ifdef UNICODE
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88 typedef MONITORINFOEXW MONITORINFOEX;
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89 typedef LPMONITORINFOEXW LPMONITORINFOEX;
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90 #else
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91 typedef MONITORINFOEXA MONITORINFOEX;
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92 typedef LPMONITORINFOEXA LPMONITORINFOEX;
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93 #endif // UNICODE
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94 #endif
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95
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96 typedef BOOL (CALLBACK* MONITORENUMPROC)(HMONITOR, HDC, LPRECT, LPARAM);
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97
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98 #ifndef DISPLAY_DEVICE_ATTACHED_TO_DESKTOP
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99 typedef struct _DISPLAY_DEVICEA {
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100 DWORD cb;
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101 CHAR DeviceName[32];
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102 CHAR DeviceString[128];
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103 DWORD StateFlags;
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104 CHAR DeviceID[128];
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105 CHAR DeviceKey[128];
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106 } DISPLAY_DEVICEA, *PDISPLAY_DEVICEA, *LPDISPLAY_DEVICEA;
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107 typedef struct _DISPLAY_DEVICEW {
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108 DWORD cb;
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109 WCHAR DeviceName[32];
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110 WCHAR DeviceString[128];
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111 DWORD StateFlags;
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112 WCHAR DeviceID[128];
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113 WCHAR DeviceKey[128];
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114 } DISPLAY_DEVICEW, *PDISPLAY_DEVICEW, *LPDISPLAY_DEVICEW;
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115 #ifdef UNICODE
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116 typedef DISPLAY_DEVICEW DISPLAY_DEVICE;
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117 typedef PDISPLAY_DEVICEW PDISPLAY_DEVICE;
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118 typedef LPDISPLAY_DEVICEW LPDISPLAY_DEVICE;
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119 #else
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120 typedef DISPLAY_DEVICEA DISPLAY_DEVICE;
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121 typedef PDISPLAY_DEVICEA PDISPLAY_DEVICE;
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122 typedef LPDISPLAY_DEVICEA LPDISPLAY_DEVICE;
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123 #endif // UNICODE
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124
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125 #define DISPLAY_DEVICE_ATTACHED_TO_DESKTOP 0x00000001
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126 #define DISPLAY_DEVICE_MULTI_DRIVER 0x00000002
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127 #define DISPLAY_DEVICE_PRIMARY_DEVICE 0x00000004
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128 #define DISPLAY_DEVICE_MIRRORING_DRIVER 0x00000008
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129 #define DISPLAY_DEVICE_VGA_COMPATIBLE 0x00000010
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130 #endif
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131
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132 #endif // SM_CMONITORS
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133
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134 #undef GetMonitorInfo
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135 #undef GetSystemMetrics
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136 #undef MonitorFromWindow
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137 #undef MonitorFromRect
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138 #undef MonitorFromPoint
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139 #undef EnumDisplayMonitors
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140 #undef EnumDisplayDevices
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141
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142 //
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143 // Define COMPILE_MULTIMON_STUBS to compile the stubs;
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144 // otherwise, you get the declarations.
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145 //
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146 #ifdef COMPILE_MULTIMON_STUBS
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147
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148 //-----------------------------------------------------------------------------
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149 //
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150 // Implement the API stubs.
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151 //
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152 //-----------------------------------------------------------------------------
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153
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154 #ifndef MULTIMON_FNS_DEFINED
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155
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156 int (WINAPI* g_pfnGetSystemMetrics)(int) = NULL;
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157 HMONITOR (WINAPI* g_pfnMonitorFromWindow)(HWND, DWORD) = NULL;
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158 HMONITOR (WINAPI* g_pfnMonitorFromRect)(LPCRECT, DWORD) = NULL;
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159 HMONITOR (WINAPI* g_pfnMonitorFromPoint)(POINT, DWORD) = NULL;
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160 BOOL (WINAPI* g_pfnGetMonitorInfo)(HMONITOR, LPMONITORINFO) = NULL;
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161 BOOL (WINAPI* g_pfnEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM) = NULL;
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162 BOOL (WINAPI* g_pfnEnumDisplayDevices)(PVOID, DWORD, PDISPLAY_DEVICE,DWORD) = NULL;
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163 BOOL g_fMultiMonInitDone = FALSE;
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164 BOOL g_fMultimonPlatformNT = FALSE;
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165
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166 #endif
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167
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168 BOOL IsPlatformNT()
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169 {
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170 OSVERSIONINFOA osvi = {0};
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171 osvi.dwOSVersionInfoSize = sizeof(osvi);
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172 GetVersionExA((OSVERSIONINFOA*)&osvi);
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173 return (VER_PLATFORM_WIN32_NT == osvi.dwPlatformId);
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174 }
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175
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176 BOOL InitMultipleMonitorStubs(void)
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177 {
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178 HMODULE hUser32;
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179 if (g_fMultiMonInitDone)
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180 {
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181 return g_pfnGetMonitorInfo != NULL;
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182 }
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183
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184 g_fMultimonPlatformNT = IsPlatformNT();
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185 hUser32 = GetModuleHandle(TEXT("USER32"));
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186 if (hUser32 &&
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187 (*(FARPROC*)&g_pfnGetSystemMetrics = GetProcAddress(hUser32,"GetSystemMetrics")) != NULL &&
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188 (*(FARPROC*)&g_pfnMonitorFromWindow = GetProcAddress(hUser32,"MonitorFromWindow")) != NULL &&
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189 (*(FARPROC*)&g_pfnMonitorFromRect = GetProcAddress(hUser32,"MonitorFromRect")) != NULL &&
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190 (*(FARPROC*)&g_pfnMonitorFromPoint = GetProcAddress(hUser32,"MonitorFromPoint")) != NULL &&
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191 (*(FARPROC*)&g_pfnEnumDisplayMonitors = GetProcAddress(hUser32,"EnumDisplayMonitors")) != NULL &&
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192 #ifdef UNICODE
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193 (*(FARPROC*)&g_pfnEnumDisplayDevices = GetProcAddress(hUser32,"EnumDisplayDevicesW")) != NULL &&
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194 (*(FARPROC*)&g_pfnGetMonitorInfo = g_fMultimonPlatformNT ? GetProcAddress(hUser32,"GetMonitorInfoW") :
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195 GetProcAddress(hUser32,"GetMonitorInfoA")) != NULL
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196 #else
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197 (*(FARPROC*)&g_pfnGetMonitorInfo = GetProcAddress(hUser32,"GetMonitorInfoA")) != NULL &&
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198 (*(FARPROC*)&g_pfnEnumDisplayDevices = GetProcAddress(hUser32,"EnumDisplayDevicesA")) != NULL
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199 #endif
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200 ) {
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201 g_fMultiMonInitDone = TRUE;
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202 return TRUE;
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203 }
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204 else
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205 {
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206 g_pfnGetSystemMetrics = NULL;
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207 g_pfnMonitorFromWindow = NULL;
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208 g_pfnMonitorFromRect = NULL;
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209 g_pfnMonitorFromPoint = NULL;
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210 g_pfnGetMonitorInfo = NULL;
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211 g_pfnEnumDisplayMonitors = NULL;
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212 g_pfnEnumDisplayDevices = NULL;
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213
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214 g_fMultiMonInitDone = TRUE;
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215 return FALSE;
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216 }
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217 }
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218
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219 //-----------------------------------------------------------------------------
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220 //
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221 // fake implementations of Monitor APIs that work with the primary display
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222 // no special parameter validation is made since these run in client code
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223 //
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224 //-----------------------------------------------------------------------------
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225
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226 int WINAPI
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227 xGetSystemMetrics(int nIndex)
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228 {
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229 if (InitMultipleMonitorStubs())
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230 return g_pfnGetSystemMetrics(nIndex);
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231
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232 switch (nIndex)
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233 {
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234 case SM_CMONITORS:
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235 case SM_SAMEDISPLAYFORMAT:
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236 return 1;
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237
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238 case SM_XVIRTUALSCREEN:
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239 case SM_YVIRTUALSCREEN:
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240 return 0;
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241
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242 case SM_CXVIRTUALSCREEN:
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243 nIndex = SM_CXSCREEN;
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244 break;
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245
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246 case SM_CYVIRTUALSCREEN:
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247 nIndex = SM_CYSCREEN;
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248 break;
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249 }
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250
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251 return GetSystemMetrics(nIndex);
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252 }
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253
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254 #define xPRIMARY_MONITOR ((HMONITOR)0x12340042)
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255
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256 HMONITOR WINAPI
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257 xMonitorFromPoint(POINT ptScreenCoords, DWORD dwFlags)
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258 {
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259 if (InitMultipleMonitorStubs())
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260 return g_pfnMonitorFromPoint(ptScreenCoords, dwFlags);
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261
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262 if ((dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
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263 ((ptScreenCoords.x >= 0) &&
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264 (ptScreenCoords.x < GetSystemMetrics(SM_CXSCREEN)) &&
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265 (ptScreenCoords.y >= 0) &&
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266 (ptScreenCoords.y < GetSystemMetrics(SM_CYSCREEN))))
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267 {
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268 return xPRIMARY_MONITOR;
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269 }
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270
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271 return NULL;
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272 }
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273
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274 HMONITOR WINAPI
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275 xMonitorFromRect(LPCRECT lprcScreenCoords, DWORD dwFlags)
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276 {
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277 if (InitMultipleMonitorStubs())
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278 return g_pfnMonitorFromRect(lprcScreenCoords, dwFlags);
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279
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280 if ((dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
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281 ((lprcScreenCoords->right > 0) &&
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282 (lprcScreenCoords->bottom > 0) &&
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283 (lprcScreenCoords->left < GetSystemMetrics(SM_CXSCREEN)) &&
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284 (lprcScreenCoords->top < GetSystemMetrics(SM_CYSCREEN))))
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285 {
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286 return xPRIMARY_MONITOR;
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287 }
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288
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289 return NULL;
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290 }
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291
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292 HMONITOR WINAPI
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293 xMonitorFromWindow(HWND hWnd, DWORD dwFlags)
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294 {
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295 WINDOWPLACEMENT wp;
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296
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297 if (InitMultipleMonitorStubs())
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298 return g_pfnMonitorFromWindow(hWnd, dwFlags);
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299
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300 if (dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST))
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301 return xPRIMARY_MONITOR;
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302
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303 if (IsIconic(hWnd) ?
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304 GetWindowPlacement(hWnd, &wp) :
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305 GetWindowRect(hWnd, &wp.rcNormalPosition)) {
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306
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307 return xMonitorFromRect(&wp.rcNormalPosition, dwFlags);
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308 }
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309
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310 return NULL;
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311 }
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312
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313 BOOL WINAPI
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314 xGetMonitorInfo(HMONITOR hMonitor, LPMONITORINFO lpMonitorInfo)
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315 {
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316 RECT rcWork;
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317
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318 if (InitMultipleMonitorStubs())
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319 {
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320 BOOL f = g_pfnGetMonitorInfo(hMonitor, lpMonitorInfo);
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321 #ifdef UNICODE
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322 if (f && !g_fMultimonPlatformNT && (lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX)))
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323 {
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324 MultiByteToWideChar(CP_ACP, 0,
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325 (LPSTR)((MONITORINFOEX*)lpMonitorInfo)->szDevice, -1,
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326 ((MONITORINFOEX*)lpMonitorInfo)->szDevice, (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
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327 }
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328 #endif
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329 return f;
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330 }
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331
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332 if ((hMonitor == xPRIMARY_MONITOR) &&
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333 lpMonitorInfo &&
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334 (lpMonitorInfo->cbSize >= sizeof(MONITORINFO)) &&
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335 SystemParametersInfoA(SPI_GETWORKAREA, 0, &rcWork, 0))
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336 {
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337 lpMonitorInfo->rcMonitor.left = 0;
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338 lpMonitorInfo->rcMonitor.top = 0;
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339 lpMonitorInfo->rcMonitor.right = GetSystemMetrics(SM_CXSCREEN);
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340 lpMonitorInfo->rcMonitor.bottom = GetSystemMetrics(SM_CYSCREEN);
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341 lpMonitorInfo->rcWork = rcWork;
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342 lpMonitorInfo->dwFlags = MONITORINFOF_PRIMARY;
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343
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344 if (lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX))
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345 {
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346 #ifdef UNICODE
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347 MultiByteToWideChar(CP_ACP, 0, "DISPLAY", -1, ((MONITORINFOEX*)lpMonitorInfo)->szDevice, (sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
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348 #else // UNICODE
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349 lstrcpy(((MONITORINFOEX*)lpMonitorInfo)->szDevice, TEXT("DISPLAY"));
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350 #endif // UNICODE
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351 }
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352
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353 return TRUE;
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354 }
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355
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356 return FALSE;
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357 }
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358
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359 BOOL WINAPI
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360 xEnumDisplayMonitors(
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361 HDC hdcOptionalForPainting,
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362 LPCRECT lprcEnumMonitorsThatIntersect,
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363 MONITORENUMPROC lpfnEnumProc,
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364 LPARAM dwData)
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365 {
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366 RECT rcLimit;
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367
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368 if (InitMultipleMonitorStubs()) {
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369 return g_pfnEnumDisplayMonitors(
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370 hdcOptionalForPainting,
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371 lprcEnumMonitorsThatIntersect,
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372 lpfnEnumProc,
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373 dwData);
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374 }
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375
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376 if (!lpfnEnumProc)
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377 return FALSE;
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378
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379 rcLimit.left = 0;
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380 rcLimit.top = 0;
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381 rcLimit.right = GetSystemMetrics(SM_CXSCREEN);
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382 rcLimit.bottom = GetSystemMetrics(SM_CYSCREEN);
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383
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384 if (hdcOptionalForPainting)
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385 {
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386 RECT rcClip;
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387 POINT ptOrg;
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388
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389 switch (GetClipBox(hdcOptionalForPainting, &rcClip))
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390 {
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391 default:
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392 if (!GetDCOrgEx(hdcOptionalForPainting, &ptOrg))
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393 return FALSE;
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394
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395 OffsetRect(&rcLimit, -ptOrg.x, -ptOrg.y);
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396 if (IntersectRect(&rcLimit, &rcLimit, &rcClip) &&
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397 (!lprcEnumMonitorsThatIntersect ||
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398 IntersectRect(&rcLimit, &rcLimit, lprcEnumMonitorsThatIntersect))) {
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399
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400 break;
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401 }
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402 //fall thru
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403 case NULLREGION:
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404 return TRUE;
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405 case ERROR:
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406 return FALSE;
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407 }
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408 } else {
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409 if ( lprcEnumMonitorsThatIntersect &&
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410 !IntersectRect(&rcLimit, &rcLimit, lprcEnumMonitorsThatIntersect)) {
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411
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412 return TRUE;
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413 }
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414 }
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415
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416 return lpfnEnumProc(
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417 xPRIMARY_MONITOR,
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418 hdcOptionalForPainting,
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419 &rcLimit,
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420 dwData);
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421 }
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422
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423 BOOL WINAPI
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424 xEnumDisplayDevices(
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425 PVOID Unused,
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426 DWORD iDevNum,
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427 PDISPLAY_DEVICE lpDisplayDevice,
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428 DWORD dwFlags)
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429 {
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430 if (InitMultipleMonitorStubs())
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431 return g_pfnEnumDisplayDevices(Unused, iDevNum, lpDisplayDevice, dwFlags);
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432
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433 if (Unused != NULL)
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434 return FALSE;
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435
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436 if (iDevNum != 0)
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437 return FALSE;
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|
|
438
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|
|
439 if (lpDisplayDevice == NULL || lpDisplayDevice->cb < sizeof(DISPLAY_DEVICE))
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|
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440 return FALSE;
|
|
|
441
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|
|
442 #ifdef UNICODE
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443 MultiByteToWideChar(CP_ACP, 0, "DISPLAY", -1, lpDisplayDevice->DeviceName, (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)));
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444 MultiByteToWideChar(CP_ACP, 0, "DISPLAY", -1, lpDisplayDevice->DeviceString, (sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)));
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445 #else // UNICODE
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|
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446 lstrcpy((LPTSTR)lpDisplayDevice->DeviceName, TEXT("DISPLAY"));
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|
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447 lstrcpy((LPTSTR)lpDisplayDevice->DeviceString, TEXT("DISPLAY"));
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|
|
448 #endif // UNICODE
|
|
|
449
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|
|
450 lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ATTACHED_TO_DESKTOP | DISPLAY_DEVICE_PRIMARY_DEVICE;
|
|
|
451
|
|
|
452 return TRUE;
|
|
|
453 }
|
|
|
454
|
|
|
455 #undef xPRIMARY_MONITOR
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|
|
456 #undef COMPILE_MULTIMON_STUBS
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|
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457
|
|
|
458 #else // COMPILE_MULTIMON_STUBS
|
|
|
459
|
|
|
460 extern int WINAPI xGetSystemMetrics(int);
|
|
|
461 extern HMONITOR WINAPI xMonitorFromWindow(HWND, DWORD);
|
|
|
462 extern HMONITOR WINAPI xMonitorFromRect(LPCRECT, DWORD);
|
|
|
463 extern HMONITOR WINAPI xMonitorFromPoint(POINT, DWORD);
|
|
|
464 extern BOOL WINAPI xGetMonitorInfo(HMONITOR, LPMONITORINFO);
|
|
|
465 extern BOOL WINAPI xEnumDisplayMonitors(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
|
|
|
466 extern BOOL WINAPI xEnumDisplayDevices(PVOID, DWORD, PDISPLAY_DEVICE, DWORD);
|
|
|
467
|
|
|
468 #endif // COMPILE_MULTIMON_STUBS
|
|
|
469
|
|
|
470 //
|
|
|
471 // build defines that replace the regular APIs with our versions
|
|
|
472 //
|
|
|
473 #define GetSystemMetrics xGetSystemMetrics
|
|
|
474 #define MonitorFromWindow xMonitorFromWindow
|
|
|
475 #define MonitorFromRect xMonitorFromRect
|
|
|
476 #define MonitorFromPoint xMonitorFromPoint
|
|
|
477 #define GetMonitorInfo xGetMonitorInfo
|
|
|
478 #define EnumDisplayMonitors xEnumDisplayMonitors
|
|
|
479 #define EnumDisplayDevices xEnumDisplayDevices
|
|
|
480
|
|
|
481 #ifdef __cplusplus
|
|
|
482 }
|
|
|
483 #endif // __cplusplus
|
|
|
484
|
