/** * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) * * This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>. */ #include "fake_w32gdi.h" #include <stdio.h> #include <stdlib.h> #include <string.h> #include <xcb/xcb.h> #include <xcb/randr.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 GNU/Linux system under X. */ #define GAMMA_RAMP_SIZE 256 static xcb_connection_t* conn = NULL; static size_t dc_count = 0; static ssize_t crtc_count = -1; static xcb_randr_crtc_t* crtcs = NULL; static xcb_randr_get_screen_resources_current_reply_t* res_reply = NULL; /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx */ HDC GetDC(HWND hWnd) { (void) hWnd; return CreateDC(TEXT("DISPLAY"), "0", NULL, NULL); } /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx */ int ReleaseDC(HWND hWnd, HDC hDC) { (void) hWnd; (void) hDC; dc_count--; if (dc_count == 0) { if (conn != NULL) xcb_disconnect(conn); conn = NULL; if (res_reply != NULL) free(res_reply); res_reply = NULL; } return 1; } /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx */ int GetDeviceCaps(HDC hDC, int nIndex) { (void) hDC; return CM_GAMMA_RAMP + nIndex - COLORMGMTCAPS; } /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx */ BOOL SetDeviceGammaRamp(HDC hDC, LPVOID lpRamp) { xcb_void_cookie_t gamma_cookie = xcb_randr_set_crtc_gamma_checked(conn, *(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); return xcb_request_check(conn, gamma_cookie) == NULL ? TRUE : FALSE; } /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd316946(v=vs.85).aspx */ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID lpRamp) { xcb_randr_get_crtc_gamma_cookie_t gamma_cookie; xcb_randr_get_crtc_gamma_reply_t* gamma_reply; xcb_generic_error_t* error; gamma_cookie = xcb_randr_get_crtc_gamma(conn, *(xcb_randr_crtc_t*)hDC); gamma_reply = xcb_randr_get_crtc_gamma_reply(conn, 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)) 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; } /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx */ HDC CreateDC(LPCTSTR lpszDriver, LPCTSTR lpszDevice, void* lpszOutput, void* lpInitData) { int crtc_index; (void) lpszOutput; (void) lpInitData; if (strcmp(lpszDriver, "DISPLAY")) return NULL; crtc_index = atoi(lpszDevice); if (dc_count == 0) { xcb_generic_error_t* error; xcb_screen_iterator_t iter; xcb_randr_get_screen_resources_current_cookie_t res_cookie; conn = xcb_connect(NULL, NULL); iter = xcb_setup_roots_iterator(xcb_get_setup(conn)); res_cookie = xcb_randr_get_screen_resources_current(conn, iter.data->root); res_reply = xcb_randr_get_screen_resources_current_reply(conn, res_cookie, &error); if (error) { xcb_disconnect(conn); crtc_count = -1; return NULL; } crtc_count = res_reply->num_crtcs; crtcs = xcb_randr_get_screen_resources_current_crtcs(res_reply); } if (crtc_index >= crtc_count) { if (dc_count == 0) { xcb_disconnect(conn); crtc_count = -1; } return NULL; } dc_count++; return crtcs + crtc_index; } /* http://msdn.microsoft.com/en-us/library/windows/desktop/dd162609(v=vs.85).aspx */ BOOL EnumDisplayDevices(LPCTSTR lpDevice, DWORD iDevNum, PDISPLAY_DEVICE lpDisplayDevice, DWORD dwFlags) { size_t count = (size_t)crtc_count; (void) dwFlags; if (lpDevice != NULL) { fprintf(stderr, "lpDevice (argument 1) for EnumDisplayDevices should be NULL\n"); abort(); return FALSE; } if (crtc_count < 0) { if (GetDC(NULL) == NULL) return FALSE; dc_count = 0; count = (size_t)crtc_count; ReleaseDC(NULL, NULL); } if (iDevNum >= count) return FALSE; if (lpDisplayDevice->cb != sizeof(DISPLAY_DEVICE)) { fprintf(stderr, "lpDisplayDevice->cb for EnumDisplayDevices is not sizeof(DISPLAY_DEVICE)\n"); abort(); return FALSE; } sprintf(lpDisplayDevice->DeviceName, "%i", iDevNum); lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE; return TRUE; }