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-rw-r--r--src/fake-w32-gdi.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/src/fake-w32-gdi.c b/src/fake-w32-gdi.c
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+++ b/src/fake-w32-gdi.c
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+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014 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/>.
+ */
+#ifndef HAVE_GAMMA_METHOD_W32_GDI
+# error Compiling fake-w32-gdi.c without FAKE_GAMMA_METHOD_W32_GDI
+#endif
+
+
+#include "fake-w32-gdi.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+#ifndef HAVE_GAMMA_METHOD_X_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;
+ (void) lpszDevice;
+ if (strcmp(lpszDriver, "DISPLAY"))
+ return NULL;
+ 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\n");
+ 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)\n");
+ 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* connection = 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 (connection != NULL)
+ xcb_disconnect(connection);
+ connection = 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(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;
+}
+
+
+/* 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(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))
+
+ 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 = atoi(lpszDevice);
+
+ (void) lpszOutput;
+ (void) lpInitData;
+
+ if (strcmp(lpszDriver, "DISPLAY"))
+ return NULL;
+
+ if (dc_count == 0) {
+ xcb_generic_error_t* error;
+ xcb_screen_iterator_t iter;
+ xcb_randr_get_screen_resources_current_cookie_t res_cookie;
+
+ connection = xcb_connect(NULL, NULL);
+
+ iter = xcb_setup_roots_iterator(xcb_get_setup(connection));
+ 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)
+ {
+ xcb_disconnect(connection);
+ 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(connection);
+ 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;
+}
+
+
+#endif
+
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-29 02:03:45 +0000