path: root/fake-w32-gdi.h

/* See LICENSE file for copyright and license details. */
#ifndef LIBGAMMA_FAKE_W32_GDI_H
#define LIBGAMMA_FAKE_W32_GDI_H

#ifndef FAKE_LIBGAMMA_METHOD_W32_GDI
# error Including fake-w32-gdi.h without FAKE_LIBGAMMA_METHOD_W32_GDI
#endif


#ifndef __GNUC__
# define __attribute__(x)
#endif

#include <stdint.h>


/**
 * One of the Windows `typedef`:s for unsigned 16-bit integer
 * This is the one used in these functions
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#WORD
 */
typedef uint16_t WORD;

/**
 * One of the Windows `typedef`:s for unsigned 32-bit integer
 * This is the one used in these functions
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#DWORD
 */
typedef uint32_t DWORD;

/**
 * One of the Windows `typedef` for booleanic values, the `int` variant
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#BOOL
 */
typedef int BOOL;

/**
 * Windows `typedef` for a device context (the 'h' stands for 'handle')
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#HDC
 */
typedef void *HDC;

/**
 * Windows `typedef` for a window (the 'h' stands for 'handle')
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#HWND
 */
typedef void *HWND;

/**
 * One of the Windows `typedef`:s for `void *`, a generic pointer
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#LPVOID
 */
typedef void *LPVOID;

/**
 * A silly Windows `typedef` for a `const char *`, a constant string
 * 
 * It is also defined as NUL-terminated, but so are all C-strings
 * and it makes no difference. However if `UNICODE` were to be defined
 * it would be `const wchar_t *`.
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#LPCTSTR
 */
typedef const char *LPCTSTR;

/**
 * Even more silly. A Windows `typedef` for either `wchar_t` or
 * `char`, depending on whether `UNICODE` is defined (we will
 * assume `UNICODE` is not definied because that is just silly)
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#TCHAR
 */
typedef char TCHAR;

/**
 * Apperently we need `TRUE` to be defined to understand code,
 * at least in Windows...
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#BOOL
 */
#define TRUE 1

/**
 * Apperently we need `FALSE` to be defined to understand code,
 * at least in Windows...
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/aa383751(v=vs.85).aspx#BOOL
 */
#define FALSE 0



/**
 * Get the device context for a window or the entire screen
 * 
 * @param   hWnd  The window, `NULL` for the entire screen
 * @return        The device context
 * @see           http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx
 */
HDC GetDC(HWND);

/**
 * Free a device context
 * 
 * @param   hWnd  The window whose device context is `hDC`, `NULL` for the entire screen
 * @param   hDC   The device context to free
 * @return        Whether the call was successful
 * @see           http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx
 */
int ReleaseDC(HWND, HDC);


/**
 * Get information (capabilities) for a device context
 * 
 * @param   hDC     The device context
 * @param   nIndex  The information to retrieve, may be `COLORMGMTCAPS`
 * @return          The details of the queried information, can return `CM_GAMMA_RAMP`
 *                  if `nIndex` is `COLORMGMTCAPS`
 * @see             http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx
 */
int GetDeviceCaps(HDC, int) __attribute__((const));

/**
 * Colour management capabilities
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx
 */
#define COLORMGMTCAPS 1

/**
 * Colour management capabilities: has gamma ramps
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx
 */
#define CM_GAMMA_RAMP 1


/**
 * Set the gamma ramps for a device
 * 
 * @param   hDC     The device context
 * @param   lpRamp  The gamma ramps joined in the order: red, green, blue;
 *                  this is a `WORD *` casted to `void *`
 * @return          Whether the call was successful
 * @see             http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx
 */
BOOL SetDeviceGammaRamp(HDC, LPVOID restrict);

/**
 * Get the current gamma ramps for a device
 * 
 * @param   hDC     The device context
 * @param   lpRamp  The output for the gamma ramps joined in the order: red, green, blue
 *                  This is a `WORD *` casted to `void *`
 * @return          Whether the call was successful
 * @see             http://msdn.microsoft.com/en-us/library/windows/desktop/dd316946(v=vs.85).aspx
 */
BOOL GetDeviceGammaRamp(HDC, LPVOID restrict);


/**
 * Get the context for a device
 * 
 * @param   lpszDriver  The driver or a display device, use "DISPLAY" if you want a display
 * @param   lpszDevice  The name of the device. If you want a display use can use the member
 *                      name `DeviceName` in the third parameter, an output parameter, of
 *                      `EnumDisplayDevices`.
 * @param   lpszOutput  We will always use `NULL` here
 * @param   lpInitData  We will always use `NULL` here; this should actually by a `const DEVMODE *`
 * @return              The context for the device
 * @see                 http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx
 */
HDC CreateDC(LPCTSTR restrict, LPCTSTR restrict, LPCTSTR restrict, const void *restrict);

/**
 * This macro does not seem to have an official documentation that is correct
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd183490(v=vs.85).aspx
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd374074(v=vs.85).aspx
 */
#define TEXT(X) ((LPCTSTR)(X))


/**
 * Information about a display device
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd183569(v=vs.85).aspx
 */
typedef struct {
	/**
	 * Set this to `sizeof(DISPLAY_DEVICE)`
	 */
	DWORD cb;

	/**
	 * The name of the device
	 */
	TCHAR DeviceName[32];

	/**
	 * The status of the device, can include `DISPLAY_DEVICE_ACTIVE`
	 */
	DWORD StateFlags;

} DISPLAY_DEVICE;

/**
 * Appearently we are incapable of putting asterisks at the
 * end of types names, so istead we preprend them with 'P'
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd183569(v=vs.85).aspx
 */
typedef DISPLAY_DEVICE *PDISPLAY_DEVICE;

/**
 * The monitor is "on"
 * 
 * @see  http://msdn.microsoft.com/en-us/library/windows/desktop/dd183569(v=vs.85).aspx
 */
#define DISPLAY_DEVICE_ACTIVE 1

/**
 * Get a display device by its name or index
 * 
 * @param   lpDevice         The name of the device, use `NULL` to base the call on `iDevNum` instead
 * @param   iDevNum          The index of the device
 * @param   lpDisplayDevice  Output for the found device
 * @param   dwFlags          Flags, we will always use zero
 * @return                   Whether the call was successful; zero is also returned if `iDevNum`
 *                           is greater than the largest device index on the system
 * @see                      http://msdn.microsoft.com/en-us/library/windows/desktop/dd162609(v=vs.85).aspx
 */
BOOL EnumDisplayDevices(LPCTSTR restrict, DWORD, PDISPLAY_DEVICE restrict, DWORD)



#ifndef __GNUC__
# undef __attribute__
#endif

#endif