/* See LICENSE file for copyright and license details. */ #define IN_LIBGAMMA_W32_GDI #include "common.h" /* This file very sloppily translates Windows GDI calls to X RandR calls. * It should by no means be used, without additional modification, as a * part of a compatibility layer. The purpose of this file is only to make * it possible to test for logical errors in Windows specific code on * a Linux system under X. */ #ifndef HAVE_LIBGAMMA_METHOD_X_RANDR /* Use dummy translation */ /** * Get the device context for a window or the entire screen * * @param hWnd The windows, `NULL` for the entire screen * @return The device context * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx */ HDC GetDC(HWND hWnd) { /* Just a non-NULL value */ (void) hWnd; return (HDC *)16; } /** * Free a device context * * @param hWnd The window whose device context is `hDC`, `NULL` for the entire screen * @param hDC The device context to free * @return Whether the call was successful * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx */ int ReleaseDC(HWND hWnd, HDC hDC) { /* Always successful */ (void) hWnd; (void) hDC; return 1; } /** * Get information (capabilities) for a device context * * @param hDC The device context * @param nIndex The information to retrieve, may be `COLORMGMTCAPS` * @return The details of the queried information, can return `CM_GAMMA_RAMP` * if `nIndex` is `COLORMGMTCAPS` * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx */ int GetDeviceCaps(HDC hDC, int nIndex) { /* We have gamma ramps if the user asks for colour management capabilities */ (void) hDC; return CM_GAMMA_RAMP + nIndex - COLORMGMTCAPS; } /** * Set the gamma ramps for a device * * @param hDC The device context * @param lpRamp The gamma ramps joined in the order: red, green, blue * This is a `WORD*` casted to `void*` * @return Whether the call was successful * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx */ BOOL SetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) { /* Always successful */ (void) hDC; (void) lpRamp; return TRUE; } /** * Get the current gamma ramps for a device * * @param hDC The device context * @param lpRamp The output for the gamma ramps joined in the order: red, green, blue * This is a `WORD *` casted to `void *` * @return Whether the call was successful * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd316946(v=vs.85).aspx */ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) { /* Always successful */ (void) hDC; (void) lpRamp; return TRUE; } /** * Get the context for a device * * @param lpszDriver The driver or a display device, use "DISPLAY" if you want a display * @param lpszDevice The name of the device. If you want a display use can use the member * name `DeviceName` in the third parameter, an output parameter, of * `EnumDisplayDevices` * @param lpszOutput We will always use `NULL` here * @param lpInitData We will always use `NULL` here; this should actually by a `const DEVMODE *` * @return The context for the device * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx */ HDC CreateDC(LPCTSTR restrict lpszDriver, LPCTSTR restrict lpszDevice, LPCTSTR restrict lpszOutput, const void *restrict lpInitData) { /* `NULL` if not asking for a CRTC, otherwise a non-NULL value */ (void) lpszOutput; (void) lpInitData; (void) lpszDevice; return !strcmp(lpszDriver, "DISPLAY") ? (HDC *)16 : NULL; } /** * Get a display device by its name or index * * @param lpDevice The name of the device, use `NULL` to base the call on `iDevNum` instead * @param iDevNum The index of the device * @param lpDisplayDevice Output for the found device * @param dwFlags Flags, we will always use zero * @return Whether the call was successful; zero is also returned if `iDevNum` * is greater than the largest device index on the system * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd162609(v=vs.85).aspx */ BOOL EnumDisplayDevices(LPCTSTR lpDevice, restrict DWORD iDevNum, PDISPLAY_DEVICE restrict lpDisplayDevice, DWORD dwFlags) { (void) dwFlags; /* Check correctness of `lpDevice` */ if (lpDevice) { fprintf(stderr, "lpDevice (argument 1) for EnumDisplayDevices should be NULL\n"); abort(); return FALSE; } /* Pretend that we have two CRTC:s */ if (iDevNum >= 2) return FALSE; /* Check correctness of `lpDisplayDevice` */ if (lpDisplayDevice->cb != sizeof(DISPLAY_DEVICE)) { fprintf(stderr, "lpDisplayDevice->cb for EnumDisplayDevices is not sizeof(DISPLAY_DEVICE)\n"); abort(); return FALSE; } /* Store an arbitrary name for the monitor */ strcmp(lpDisplayDevice->DeviceName, "some monitor"); /* The connector is always enabled */ lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE; return TRUE; } #else /* Use translation to X RandR */ #include #include /** * The gamma ramp size that devices will * always have in Windows GDI */ #define GAMMA_RAMP_SIZE 256 /** * Connection to the X RandR display */ static xcb_connection_t *restrict connection = NULL; /** * Resouces for the screen * * We only have one screen, again this * is a very sloppy compatibility layer */ static xcb_randr_get_screen_resources_current_reply_t *restrict res_reply = NULL; /** * The number of available CRTC:s, -1 if not known yet */ static ssize_t crtc_count = -1; /** * List of X RandR CRTC:s */ static xcb_randr_crtc_t *restrict crtcs = NULL; /** * The number of opened CRTC:s */ static size_t dc_count = 0; /** * Get the device context for a window or the entire screen * * @param hWnd The windows, `NULL` for the entire screen * @return The device context * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx */ HDC GetDC(HWND hWnd) { /* Return the primary CRTC */ (void) hWnd; return CreateDC(TEXT("DISPLAY"), "0", NULL, NULL); } /** * Free a device context * * @param hWnd The window whose device context is `hDC`, `NULL` for the entire screen * @param hDC The device context to free * @return Whether the call was successful * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx */ int ReleaseDC(HWND hWnd, HDC hDC) { /* Disconnect from the RandR display when all monitors have been closed */ (void) hWnd; (void) hDC; if (!dc_count--) { if (connection) { xcb_disconnect(connection); connection = NULL; } free(res_reply); res_reply = NULL; } return 1; } /** * Get information (capabilities) for a device context * * @param hDC The device context * @param nIndex The information to retrieve, may be `COLORMGMTCAPS` * @return The details of the queried information, can return `CM_GAMMA_RAMP` * if `nIndex` is `COLORMGMTCAPS` * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx */ int GetDeviceCaps(HDC hDC, int nIndex) { /* We have gamma ramps if the user asks for colour management capabilities */ (void) hDC; return CM_GAMMA_RAMP + nIndex - COLORMGMTCAPS; } /* xcb violates the rule to never return `struct`:s */ #ifdef __GNUC__ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Waggregate-return" #endif /** * Set the gamma ramps for a device * * @param hDC The device context * @param lpRamp The gamma ramps joined in the order: red, green, blue * This is a `WORD *` casted to `void *` * @return Whether the call was successful * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx */ BOOL SetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) { /* We assume that our gamma ramps are of the same size * as used by Windows GDI (we are so sloppy) */ uint16_t *ramp = lpRamp; xcb_void_cookie_t gamma_cookie = xcb_randr_set_crtc_gamma_checked(connection, *(xcb_randr_crtc_t *)hDC, GAMMA_RAMP_SIZE, &ramp[0 * GAMMA_RAMP_SIZE], &ramp[1 * GAMMA_RAMP_SIZE], &ramp[2 * GAMMA_RAMP_SIZE]); xcb_generic_error_t *error = xcb_request_check(connection, gamma_cookie); return !error ? TRUE : FALSE; } /** * Get the current gamma ramps for a device * * @param hDC The device context * @param lpRamp The output for the gamma ramps joined in the order: red, green, blue * This is a `WORD *` casted to `void *` * @return Whether the call was successful * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd316946(v=vs.85).aspx */ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) { xcb_randr_get_crtc_gamma_cookie_t gamma_cookie; xcb_randr_get_crtc_gamma_reply_t *restrict gamma_reply; xcb_generic_error_t *error; uint16_t *restrict ramp = lpRamp; /* Read current gamma ramps */ gamma_cookie = xcb_randr_get_crtc_gamma(connection, *(xcb_randr_crtc_t *)hDC); gamma_reply = xcb_randr_get_crtc_gamma_reply(connection, gamma_cookie, &error); if (error) return FALSE; /* Copy the ramps into the output parameter (coalesced) */ memcpy(&ramp[0 * GAMMA_RAMP_SIZE], xcb_randr_get_crtc_gamma_red(gamma_reply), GAMMA_RAMP_SIZE * sizeof(*ramp)); memcpy(&ramp[1 * GAMMA_RAMP_SIZE], xcb_randr_get_crtc_gamma_green(gamma_reply), GAMMA_RAMP_SIZE * sizeof(*ramp)); memcpy(&ramp[2 * GAMMA_RAMP_SIZE], xcb_randr_get_crtc_gamma_blue(gamma_reply), GAMMA_RAMP_SIZE * sizeof(*ramp)); free(gamma_reply); return TRUE; } /** * Get the context for a device * * @param lpszDriver The driver or a display device, use "DISPLAY" if you want a display * @param lpszDevice The name of the device. If you want a display use can use the member * name `DeviceName` in the third parameter, an output parameter, of * `EnumDisplayDevices` * @param lpszOutput We will always use `NULL` here * @param lpInitData We will always use `NULL` here; this should actually by a `const DEVMODE *` * @return The context for the device * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx */ HDC CreateDC(LPCTSTR restrict lpszDriver, LPCTSTR restrict lpszDevice, LPCTSTR restrict lpszOutput, const void *restrict lpInitData) { int crtc_index = atoi(lpszDevice); xcb_generic_error_t *error; xcb_screen_iterator_t iter; xcb_randr_get_screen_resources_current_cookie_t res_cookie; (void) lpszOutput; (void) lpInitData; /* Check correctness of input */ if (strcmp(lpszDriver, "DISPLAY")) return NULL; /* Connect to the display and get screen data if not already done so */ if (!dc_count) { /* Connect to the display */ connection = xcb_connect(NULL, NULL); /* Get the first screen */ iter = xcb_setup_roots_iterator(xcb_get_setup(connection)); /* Get the resources of the screen */ res_cookie = xcb_randr_get_screen_resources_current(connection, iter.data->root); res_reply = xcb_randr_get_screen_resources_current_reply(connection, res_cookie, &error); if (error) { fprintf(stderr, "Failed to open X connection\n"); xcb_disconnect(connection); crtc_count = -1; return NULL; } /* Get the number of CRTC:s */ crtc_count = res_reply->num_crtcs; /* Get the CRTC ID:s */ crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply); } /* Was the index too high */ if (crtc_index >= crtc_count) { /* Disconnect and release resouces and mark that * we do not know the number of available CRTC:s * if we have not opened any monitors yet */ if (!dc_count) { xcb_disconnect(connection); free(res_reply); res_reply = NULL; crtc_count = -1; } return NULL; } /* We have opened a new CRTC */ dc_count++; /* Return the ID of the CRTC */ return &crtcs[crtc_index]; } #ifdef __GNUC__ # pragma GCC diagnostic pop #endif /** * Get a display device by its name or index * * @param lpDevice The name of the device, use `NULL` to base the call on `iDevNum` instead * @param iDevNum The index of the device * @param lpDisplayDevice Output for the found device * @param dwFlags Flags, we will always use zero * @return Whether the call was successful; zero is also returned if `iDevNum` * is greater than the largest device index on the system * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd162609(v=vs.85).aspx */ BOOL EnumDisplayDevices(LPCTSTR restrict lpDevice, DWORD iDevNum, PDISPLAY_DEVICE restrict lpDisplayDevice, DWORD dwFlags) { size_t count = (size_t)crtc_count; (void) dwFlags; /* Check the correctness of the input */ if (lpDevice) { fprintf(stderr, "lpDevice (argument 1) for EnumDisplayDevices should be NULL\n"); abort(); return FALSE; } /* Do we know how many CRTC:s are available? */ if (crtc_count < 0) { /* If not open the first CRTC so that will be figured out */ if (!GetDC(NULL)) return FALSE; count = (size_t)crtc_count; /* Close the primary monitor that we just closed */ ReleaseDC(NULL, NULL); } /* Check that the request CRTC exists */ if (iDevNum >= count) return FALSE; /* Check the correctness of the input */ if (lpDisplayDevice->cb != sizeof(DISPLAY_DEVICE)) { fprintf(stderr, "lpDisplayDevice->cb for EnumDisplayDevices is not sizeof(DISPLAY_DEVICE)\n"); abort(); return FALSE; } /* Store name for the CRTC */ sprintf(lpDisplayDevice->DeviceName, "%lu", (unsigned long int)iDevNum); /* The connector that the CRTC belongs to is enabled */ lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE; return TRUE; } #endif