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Diffstat (limited to '')
| -rw-r--r-- | src/fake_w32gdi.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/src/fake_w32gdi.c b/src/fake_w32gdi.c new file mode 100644 index 0000000..df8fe7e --- /dev/null +++ b/src/fake_w32gdi.c @@ -0,0 +1,202 @@ +/** + * 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); + xcb_generic_error_t* error = xcb_request_check(conn, gamma_cookie); + return error == 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) +{ + (void) lpszOutput; + (void) lpInitData; + + if (strcmp(lpszDriver, "DISPLAY")) + return NULL; + + int 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) +{ + (void) dwFlags; + + size_t count = (size_t)crtc_count; + 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; +} + |