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-rw-r--r--src/lib/fake-w32-gdi.c62
1 files changed, 54 insertions, 8 deletions
diff --git a/src/lib/fake-w32-gdi.c b/src/lib/fake-w32-gdi.c
index 541b3c8..ba72dce 100644
--- a/src/lib/fake-w32-gdi.c
+++ b/src/lib/fake-w32-gdi.c
@@ -34,10 +34,13 @@
#ifndef HAVE_LIBGAMMA_METHOD_X_RANDR
+/* Use dummy translation. */
+
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx */
HDC GetDC(HWND hWnd)
{
+ /* Just a non-NULL value. */
(void) hWnd;
return (HDC*)16;
}
@@ -45,6 +48,7 @@ HDC GetDC(HWND hWnd)
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx */
int ReleaseDC(HWND hWnd, HDC hDC)
{
+ /* Always successful. */
(void) hWnd;
(void) hDC;
return 1;
@@ -54,6 +58,7 @@ int ReleaseDC(HWND hWnd, HDC hDC)
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx */
int GetDeviceCaps(HDC hDC, int nIndex)
{
+ /* We have gamma ramps if the user asks for colour management capabilities. */
(void) hDC;
return CM_GAMMA_RAMP + nIndex - COLORMGMTCAPS;
}
@@ -61,6 +66,7 @@ int GetDeviceCaps(HDC hDC, int nIndex)
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd372194(v=vs.85).aspx */
BOOL SetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp)
{
+ /* Always successful. */
(void) hDC;
(void) lpRamp;
return TRUE;
@@ -69,6 +75,7 @@ BOOL SetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp)
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd316946(v=vs.85).aspx */
BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp)
{
+ /* Always successful. */
(void) hDC;
(void) lpRamp;
return TRUE;
@@ -79,12 +86,11 @@ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp)
HDC CreateDC(LPCTSTR restrict lpszDriver, LPCTSTR restrict lpszDevice,
void* restrict lpszOutput, void* restrict lpInitData)
{
+ /* `NULL` if not asking for a CRTC, otherwise a non-NULL value. */
(void) lpszOutput;
(void) lpInitData;
(void) lpszDevice;
- if (strcmp(lpszDriver, "DISPLAY"))
- return NULL;
- return (HDC*)16;
+ return strcmp(lpszDriver, "DISPLAY") ? NULL : (HDC*)16;
}
@@ -93,46 +99,78 @@ BOOL EnumDisplayDevices(LPCTSTR lpDevice, restrict DWORD iDevNum,
PDISPLAY_DEVICE restrict lpDisplayDevice, DWORD dwFlags)
{
(void) dwFlags;
+ /* Check correctness of `lpDevice`. */
if (lpDevice != NULL)
{
fprintf(stderr, "lpDevice (argument 1) for EnumDisplayDevices should be NULL\n");
abort();
return FALSE;
}
+ /* Pretend that we have two CRTC:s. */
if (iDevNum >= 2)
return FALSE;
+ /* Check correctness of `lpDisplayDevice`. */
if (lpDisplayDevice->cb != sizeof(DISPLAY_DEVICE))
{
- fprintf(stderr,
- "lpDisplayDevice->cb for EnumDisplayDevices is not sizeof(DISPLAY_DEVICE)\n");
+ fprintf(stderr, "lpDisplayDevice->cb for EnumDisplayDevices is not sizeof(DISPLAY_DEVICE)\n");
abort();
return FALSE;
}
+ /* Store an arbitrary name for the monitor. */
strcmp(lpDisplayDevice->DeviceName, "some monitor");
+ /* The connector is always enabled. */
lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ACTIVE;
return TRUE;
}
+
#else
+/* Use translation to X RandR. */
#include <xcb/xcb.h>
#include <xcb/randr.h>
+/**
+ * The gamma ramp size that devices will
+ * always have in Windows GDI.
+ */
#define GAMMA_RAMP_SIZE 256
+/**
+ * Connection to the X RandR display.
+ */
static xcb_connection_t* restrict connection = NULL;
-static size_t dc_count = 0;
+
+/**
+ * Resouces for the screen.
+ * We only have one screen, again this is a very sloppy compatibility layer.
+ */
+static xcb_randr_get_screen_resources_current_reply_t* restrict res_reply = NULL;
+
+/**
+ * The number of available CRTC:s, -1 if not known yet.
+ */
static ssize_t crtc_count = -1;
+
+/**
+ * List of X RandR CRTC:s.
+ */
static xcb_randr_crtc_t* restrict crtcs = NULL;
-static xcb_randr_get_screen_resources_current_reply_t* restrict res_reply = NULL;
+
+/**
+ * The number of opened CRTC:s.
+ */
+static size_t dc_count = 0;
+
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144871(v=vs.85).aspx */
HDC GetDC(HWND hWnd)
{
+ /* Return the primary CRTC. */
(void) hWnd;
return CreateDC(TEXT("DISPLAY"), "0", NULL, NULL);
}
@@ -141,6 +179,7 @@ HDC GetDC(HWND hWnd)
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd162920(v=vs.85).aspx */
int ReleaseDC(HWND hWnd, HDC hDC)
{
+ /* Disconnect from the RandR display when all monitors have been closed. */
(void) hWnd;
(void) hDC;
dc_count--;
@@ -159,17 +198,22 @@ int ReleaseDC(HWND hWnd, HDC hDC)
/* http://msdn.microsoft.com/en-us/library/windows/desktop/dd144877(v=vs.85).aspx */
int GetDeviceCaps(HDC hDC, int nIndex)
{
+ /* We have gamma ramps if the user asks for colour management capabilities. */
(void) hDC;
return CM_GAMMA_RAMP + nIndex - COLORMGMTCAPS;
}
+/* xcb violates the rule to never return struct:s. */
# 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)
{
+ /* We assume that our gamma ramps are of the same size
+ as used by Windows GDI (we are so sloppy.) */
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,
@@ -187,15 +231,16 @@ BOOL GetDeviceGammaRamp(HDC hDC, LPVOID restrict lpRamp)
xcb_randr_get_crtc_gamma_reply_t* restrict gamma_reply;
xcb_generic_error_t* error;
+ /* Read current gamma ramps. */
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))
+ /* Copy the ramps into the output parameter. (coalesced) */
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));
@@ -256,6 +301,7 @@ HDC CreateDC(LPCTSTR restrict lpszDriver, LPCTSTR restrict lpszDevice,
return crtcs + crtc_index;
}
+
# pragma GCC diagnostic pop
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-10 15:43:12 +0000