diff options
Diffstat (limited to 'src/lib/fake-w32-gdi.c')
| -rw-r--r-- | src/lib/fake-w32-gdi.c | 593 |
1 files changed, 289 insertions, 304 deletions
diff --git a/src/lib/fake-w32-gdi.c b/src/lib/fake-w32-gdi.c index 1489073..68847ca 100644 --- a/src/lib/fake-w32-gdi.c +++ b/src/lib/fake-w32-gdi.c @@ -1,20 +1,4 @@ -/** - * libgamma -- Display server abstraction layer for gamma ramp adjustments - * Copyright (C) 2014, 2015 Mattias Andrée (maandree@member.fsf.org) - * - * This library is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this library. If not, see <http://www.gnu.org/licenses/>. - */ +/* See LICENSE file for copyright and license details. */ #ifndef HAVE_LIBGAMMA_METHOD_W32_GDI # error Compiling fake-w32-gdi.c without FAKE_LIBGAMMA_METHOD_W32_GDI #endif @@ -34,93 +18,98 @@ #ifndef HAVE_LIBGAMMA_METHOD_X_RANDR -/* Use dummy translation. */ +/* Use dummy translation */ /** - * Get the device context for a window or the entire screen. + * Get the device context for a window or the entire screen * - * @param hWnd The windows, `NULL` for the entire screen. - * @return The device context. + * @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) +HDC +GetDC(HWND hWnd) { - /* Just a non-NULL value. */ - (void) hWnd; - return (HDC*)16; + /* Just a non-NULL value */ + (void) hWnd; + return (HDC *)16; } /** - * Free a device context. + * 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. + * @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) +int +ReleaseDC(HWND hWnd, HDC hDC) { - /* Always successful. */ - (void) hWnd; - (void) hDC; - return 1; + /* Always successful */ + (void) hWnd; + (void) hDC; + return 1; } /** - * Get information (capabilities) for a device context. + * Get information (capabilities) for a device context * - * @param hDC The device context. - * @param nIndex The information to retrieve, may be `COLORMGMTCAPS`. + * @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`. + * 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) +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; + /* 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. + * 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. + * @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) +BOOL +SetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) { - /* Always successful. */ - (void) hDC; - (void) lpRamp; - return TRUE; + /* Always successful */ + (void) hDC; + (void) lpRamp; + return TRUE; } /** - * Get the current gamma ramps for a device. + * 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. + * @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) +BOOL +GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) { - /* Always successful. */ - (void) hDC; - (void) lpRamp; - return TRUE; + /* Always successful */ + (void) hDC; + (void) lpRamp; + return TRUE; } @@ -128,68 +117,66 @@ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) /** * Get the context for a device * - * @param lpszDriver The driver or a display device, use "DISPLAY" if you want a display. + * @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 - - * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx + * `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) +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") ? NULL : (HDC*)16; + /* `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. + * 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. + * @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) +BOOL +EnumDisplayDevices(LPCTSTR lpDevice, restrict DWORD iDevNum, PDISPLAY_DEVICE restrict lpDisplayDevice, DWORD dwFlags) { - (void) dwFlags; - /* Check correctness of `lpDevice`. */ - if (lpDevice != NULL) - { - 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; + (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. */ +/* Use translation to X RandR */ #include <xcb/xcb.h> @@ -198,162 +185,168 @@ BOOL EnumDisplayDevices(LPCTSTR lpDevice, restrict DWORD iDevNum, /** * The gamma ramp size that devices will - * always have in Windows GDI. + * always have in Windows GDI */ -#define GAMMA_RAMP_SIZE 256 +#define GAMMA_RAMP_SIZE 256 /** - * Connection to the X RandR display. + * Connection to the X RandR display */ -static xcb_connection_t* restrict connection = NULL; +static xcb_connection_t *restrict connection = NULL; /** - * Resouces for the screen. - * We only have one screen, again this is a very sloppy compatibility layer. + * 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; +static xcb_randr_get_screen_resources_current_reply_t *restrict res_reply = NULL; /** - * The number of available CRTC:s, -1 if not known yet. + * The number of available CRTC:s, -1 if not known yet */ static ssize_t crtc_count = -1; /** - * List of X RandR CRTC:s. + * List of X RandR CRTC:s */ -static xcb_randr_crtc_t* restrict crtcs = NULL; +static xcb_randr_crtc_t *restrict crtcs = NULL; /** - * The number of opened CRTC:s. + * The number of opened CRTC:s */ static size_t dc_count = 0; /** - * Get the device context for a window or the entire screen. + * Get the device context for a window or the entire screen * - * @param hWnd The windows, `NULL` for the entire screen. - * @return The device context. + * @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) +HDC +GetDC(HWND hWnd) { - /* Return the primary CRTC. */ - (void) hWnd; - return CreateDC(TEXT("DISPLAY"), "0", NULL, NULL); + /* Return the primary CRTC */ + (void) hWnd; + return CreateDC(TEXT("DISPLAY"), "0", NULL, NULL); } /** - * Free a device context. + * 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. + * @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) +int +ReleaseDC(HWND hWnd, HDC hDC) { - /* Disconnect from the RandR display when all monitors have been closed. */ - (void) hWnd; - (void) hDC; - dc_count--; - if (dc_count == 0) - { - if (connection != NULL) - xcb_disconnect(connection); - connection = NULL; - free(res_reply); - res_reply = NULL; - } - return 1; + /* 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. + * Get information (capabilities) for a device context * - * @param hDC The device context. - * @param nIndex The information to retrieve, may be `COLORMGMTCAPS`. + * @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`. + * 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) +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; + /* 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 __GCC__ +/* 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. + * 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. + * @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) +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.) */ - xcb_void_cookie_t gamma_cookie = - xcb_randr_set_crtc_gamma_checked(connection, *(xcb_randr_crtc_t*)hDC, GAMMA_RAMP_SIZE, - ((uint16_t*)lpRamp) + 0 * GAMMA_RAMP_SIZE, - ((uint16_t*)lpRamp) + 1 * GAMMA_RAMP_SIZE, - ((uint16_t*)lpRamp) + 2 * GAMMA_RAMP_SIZE); - xcb_generic_error_t* error = xcb_request_check(connection, gamma_cookie); - return error == NULL ? TRUE : FALSE; + /* We assume that our gamma ramps are of the same size + * as used by Windows GDI (we are so sloppy) */ + xcb_void_cookie_t gamma_cookie = + xcb_randr_set_crtc_gamma_checked(connection, *(xcb_randr_crtc_t *)hDC, GAMMA_RAMP_SIZE, + &((uint16_t *)lpRamp)[0 * GAMMA_RAMP_SIZE], + &((uint16_t *)lpRamp)[1 * GAMMA_RAMP_SIZE], + &((uint16_t *)lpRamp)[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. + * 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. + * @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) +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; - - /* 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; - -#define DEST_RAMP(I) (((uint16_t*)lpRamp) + (I) * GAMMA_RAMP_SIZE) + xcb_randr_get_crtc_gamma_cookie_t gamma_cookie; + xcb_randr_get_crtc_gamma_reply_t *restrict gamma_reply; + xcb_generic_error_t *error; + + /* 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; + +#define DEST_RAMP(I) (&((uint16_t *)lpRamp)[(I) * GAMMA_RAMP_SIZE]) #define SRC_RAMP(C) (xcb_randr_get_crtc_gamma_##C(gamma_reply)) - - /* Copy the ramps into the output parameter. (coalesced) */ - memcpy(DEST_RAMP(0), SRC_RAMP(red), GAMMA_RAMP_SIZE * sizeof(uint16_t)); - memcpy(DEST_RAMP(1), SRC_RAMP(green), GAMMA_RAMP_SIZE * sizeof(uint16_t)); - memcpy(DEST_RAMP(2), SRC_RAMP(blue), GAMMA_RAMP_SIZE * sizeof(uint16_t)); - + + /* Copy the ramps into the output parameter (coalesced) */ + memcpy(DEST_RAMP(0), SRC_RAMP(red), GAMMA_RAMP_SIZE * sizeof(uint16_t)); + memcpy(DEST_RAMP(1), SRC_RAMP(green), GAMMA_RAMP_SIZE * sizeof(uint16_t)); + memcpy(DEST_RAMP(2), SRC_RAMP(blue), GAMMA_RAMP_SIZE * sizeof(uint16_t)); + #undef SRC_RAMP #undef DEST_RAMP - - free(gamma_reply); - return TRUE; + + free(gamma_reply); + return TRUE; } @@ -361,134 +354,126 @@ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp) /** * Get the context for a device * - * @param lpszDriver The driver or a display device, use "DISPLAY" if you want a display. + * @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 - - * @see http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx + * `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) +HDC +CreateDC(LPCTSTR restrict lpszDriver, LPCTSTR restrict lpszDevice, LPCTSTR restrict lpszOutput, const void *restrict lpInitData) { - int crtc_index = atoi(lpszDevice); - - (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 == 0) - { - xcb_generic_error_t* error; - xcb_screen_iterator_t iter; - xcb_randr_get_screen_resources_current_cookie_t res_cookie; - - /* 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; + 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); } - - /* 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 == 0) - { - xcb_disconnect(connection); - free(res_reply); - res_reply = NULL; - crtc_count = -1; + + /* 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; } - return NULL; - } - - /* We have opened a new CRTC. */ - dc_count++; - /* Return the ID of the CRTC. */ - return crtcs + crtc_index; + + /* We have opened a new CRTC */ + dc_count++; + /* Return the ID of the CRTC */ + return &crtcs[crtc_index]; } -#ifdef __GCC__ +#ifdef __GNUC__ # pragma GCC diagnostic pop #endif /** - * Get a display device by its name or index. + * 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. + * @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) +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 != NULL) - { - 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) == 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, "%i", iDevNum); - /* The connector that the CRTC belongs to is enabled. */ - lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE; - return TRUE; + 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, "%i", iDevNum); + /* The connector that the CRTC belongs to is enabled */ + lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE; + return TRUE; } #endif - |