Fake Windows [For testing]

configure.ac

@@ -102,13 +102,28 @@ AS_IF([test "x$enable_vidmode" != xno], [
 ])
 AM_CONDITIONAL([ENABLE_VIDMODE], [test "x$enable_vidmode" = xyes])
 
+# Check for fake Windows GDI
+AC_MSG_CHECKING([whether to enable fake WinGDI])
+AC_ARG_ENABLE([fakegdi], [AC_HELP_STRING([--enable-fakegdi],
+	[enable fake WinGDI])],
+        [enable_fakegdi=$enableval],[enable_fakegdi=no])
+AS_IF([test "x$enable_fakegdi" != xno], [
+	AC_DEFINE([FAKE_W32GDI], 1,
+		[Define to 1 to enable WinGDI method])
+        AC_MSG_RESULT([yes])
+	enable_fakegdi=yes
+], [
+        AC_MSG_RESULT([no])
+])
+AM_CONDITIONAL([FAKE_W32GDI], [test "x$enable_fakegdi" != xno])
+
 # Check Windows GDI method 
 AC_MSG_CHECKING([whether to enable WinGDI method])
 AC_ARG_ENABLE([wingdi], [AC_HELP_STRING([--enable-wingdi],
 	[enable WinGDI method])],
 	[enable_wingdi=$enableval],[enable_wingdi=maybe])
 AS_IF([test "x$enable_wingdi" != xno], [
-	AS_IF([test $have_windows_h = yes], [
+	AS_IF([test $have_windows_h = yes -o $enable_fakegdi = yes], [
 		AC_DEFINE([ENABLE_WINGDI], 1,
 			[Define to 1 to enable WinGDI method])
 		AC_MSG_RESULT([yes])

src/Makefile.am

@@ -22,6 +22,7 @@ EXTRA_redshift_SOURCES = \
 	gamma-randr.c gamma-randr.h \
 	gamma-vidmode.c gamma-vidmode.h \
 	gamma-w32gdi.c gamma-w32gdi.h \
+	fake-w32gdi.c fake-w32gdi.h \
 	location-geoclue.c location-geoclue.h
 
 AM_CFLAGS =
@@ -53,8 +54,12 @@ endif
 
 if ENABLE_WINGDI
 redshift_SOURCES += gamma-w32gdi.c gamma-w32gdi.h
+if FAKE_W32GDI
+redshift_SOURCES += fake-w32gdi.c fake-w32gdi.h
+else
 redshift_LDADD += -lgdi32
 endif
+endif
 
 
 if ENABLE_GEOCLUE

src/fake-w32gdi.c

@@ -0,0 +1,275 @@
+/* fake-w32gdi.h -- Fake Windows library headers
+   This file is part of Redshift.
+
+   Redshift 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.
+
+   Redshift 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 Redshift.  If not, see <http://www.gnu.org/licenses/>.
+
+   Copyright (c) 2014  Mattias Andrée <maandree@member.fsf.org>
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "fake-w32gdi.h"
+
+
+#ifndef ENABLE_RANDR
+
+/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx */
+HDC GetDC(HWND hWnd)
+{
+	(void) hWnd;
+	return (HDC*)16;
+}
+
+/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx */
+int ReleaseDC(HWND hWnd, HDC hDC)
+{
+	(void) hWnd;
+	(void) hDC;
+	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)
+{
+	(void) hDC;
+	(void) lpRamp;
+	return TRUE;
+}
+
+/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd316946(v=vs.85).aspx */
+BOOL GetDeviceGammaRamp(HDC hDC, LPVOID lpRamp)
+{
+	(void) hDC;
+	(void) lpRamp;
+	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;
+	(void) lpszDevice;
+	return (HDC*)16;
+}
+
+
+/* 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;
+	if (lpDevice != NULL) {
+		fprintf(stderr, "lpDevice (argument 1) for EnumDisplayDevices should be NULL");
+		abort();
+		return FALSE;
+	}
+	if (iDevNum >= 2)
+		return FALSE;
+	if (lpDisplayDevice->cb != sizeof(DISPLAY_DEVICE)) {
+		fprintf(stderr,
+			"lpDisplayDevice->cb for EnumDisplayDevices is not sizeof(DISPLAY_DEVICE)");
+		abort();
+		return FALSE;
+	}
+	strcmp(lpDisplayDevice->DeviceName, "some monitor");
+	lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE;
+	return TRUE;
+}
+
+#else
+
+
+#include <xcb/xcb.h>
+#include <xcb/randr.h>
+
+
+#define GAMMA_RAMP_SIZE  256
+
+
+static xcb_connection_t *conn = NULL;
+static int dc_count = 0;
+static int 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;
+	int count = crtc_count;
+	if (lpDevice != NULL) {
+		fprintf(stderr, "lpDevice (argument 1) for EnumDisplayDevices should be NULL");
+		abort();
+		return FALSE;
+	}
+	if (crtc_count < 0) {
+		if (GetDC(NULL) == NULL)
+			return FALSE;
+		dc_count = 0;
+		count = 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)");
+		abort();
+		return FALSE;
+	}
+	sprintf(lpDisplayDevice->DeviceName, "%i", iDevNum);
+	lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE;
+	return TRUE;
+}
+
+
+#endif