/**
* 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
/* 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. */
#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 restrict 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 restrict lpRamp)
{
(void) hDC;
(void) lpRamp;
return TRUE;
}
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx */
HDC CreateDC(LPCTSTR restrict lpszDriver, LPCTSTR restrict lpszDevice,
void* restrict lpszOutput, void* restrict 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, restrict DWORD iDevNum,
PDISPLAY_DEVICE restrict 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* restrict connection = NULL;
static size_t dc_count = 0;
static ssize_t crtc_count = -1;
static xcb_randr_crtc_t* restrict crtcs = NULL;
static xcb_randr_get_screen_resources_current_reply_t* restrict 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;
}
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Waggregate-return"
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx */
BOOL SetDeviceGammaRamp(HDC hDC, LPVOID restrict 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 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;
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 restrict lpszDriver, LPCTSTR restrict lpszDevice,
void* restrict lpszOutput, void* restrict 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;
}
# pragma GCC diagnostic pop
/* 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)
{
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
