[reactos] 01/01: [DESK] Find best display settings (#6288)

[Katayama Hirofumi MZ]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=8d7a8f0ec106d5e6780cf…

commit 8d7a8f0ec106d5e6780cfd3ae974894027883a0a
Author:     Katayama Hirofumi MZ <katayama.hirofumi.mz(a)gmail.com>
AuthorDate: Sat Jan 6 10:59:05 2024 +0900
Commit:     GitHub <noreply(a)github.com>
CommitDate: Sat Jan 6 10:59:05 2024 +0900

    [DESK] Find best display settings (#6288)
    
    Based on KRosUser's desk.patch.
    JIRA issue: CORE-18187, CORE-16878
    - Add FindBestElement helper function.
    - Use FindBestElement to find the best
      display settings.
---
 dll/cpl/desk/settings.c | 51 ++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 13 deletions(-)

diff --git a/dll/cpl/desk/settings.c b/dll/cpl/desk/settings.c
index 602df32800b..aefaa9f6d6b 100644
--- a/dll/cpl/desk/settings.c
+++ b/dll/cpl/desk/settings.c
@@ -842,6 +842,34 @@ SwitchDisplayMode(HWND hwndDlg, PWSTR DeviceName, PSETTINGS_ENTRY
seInit, PSETTI
     }
 }
 
+static
+PSETTINGS_ENTRY
+FindBestElement(
+    _In_ PDISPLAY_DEVICE_ENTRY pDevice)
+{
+    PSETTINGS_ENTRY Request = &pDevice->InitialSettings, BestEntry = NULL,
Current;
+    LONG Distance, NearestDistance = MAXLONG;
+
+    /* Find the best entry in the list */
+    for (Current = pDevice->Settings; Current; Current = Current->Flink)
+    {
+        Distance = 0x100000 * labs(Current->dmBitsPerPel       -
Request->dmBitsPerPel      ) +
+                      0x100 * labs(Current->dmPelsWidth        -
Request->dmPelsWidth       ) +
+                      0x100 * labs(Current->dmPelsHeight       -
Request->dmPelsHeight      ) +
+                              labs(Current->dmDisplayFrequency -
Request->dmDisplayFrequency);
+        if (Distance == 0)
+            return Current;
+
+        if (Distance < NearestDistance)
+        {
+            BestEntry = Current;
+            NearestDistance = Distance;
+        }
+    }
+
+    return BestEntry;
+}
+
 static VOID
 ApplyDisplaySettings(HWND hwndDlg, PSETTINGS_DATA pData)
 {
@@ -866,10 +894,7 @@ ApplyDisplaySettings(HWND hwndDlg, PSETTINGS_DATA pData)
     }
     else
     {
-        pData->CurrentDisplayDevice->CurrentSettings->dmPelsWidth =
pData->CurrentDisplayDevice->InitialSettings.dmPelsWidth;
-        pData->CurrentDisplayDevice->CurrentSettings->dmPelsHeight =
pData->CurrentDisplayDevice->InitialSettings.dmPelsHeight;
-        pData->CurrentDisplayDevice->CurrentSettings->dmBitsPerPel =
pData->CurrentDisplayDevice->InitialSettings.dmBitsPerPel;
-        pData->CurrentDisplayDevice->CurrentSettings->dmDisplayFrequency =
pData->CurrentDisplayDevice->InitialSettings.dmDisplayFrequency;
+        pData->CurrentDisplayDevice->CurrentSettings =
FindBestElement(pData->CurrentDisplayDevice);
         UpdateDisplay(hwndDlg, pData, TRUE);
     }
 }
@@ -921,16 +946,16 @@ SettingsPageProc(IN HWND hwndDlg, IN UINT uMsg, IN WPARAM wParam, IN
LPARAM lPar
                     DEVMODE devmode;
                     ZeroMemory(&devmode, sizeof(devmode));
                     devmode.dmSize = (WORD)sizeof(devmode);
-                    if
(EnumDisplaySettingsExW(pData->CurrentDisplayDevice->DeviceName,
ENUM_CURRENT_SETTINGS, &devmode, 0))
+                    if
(EnumDisplaySettingsExW(pData->CurrentDisplayDevice->DeviceName,
+                                               ENUM_CURRENT_SETTINGS, &devmode, 0))
                     {
-                        pData->CurrentDisplayDevice->InitialSettings.dmPelsWidth =
devmode.dmPelsWidth;
-                        pData->CurrentDisplayDevice->InitialSettings.dmPelsHeight =
devmode.dmPelsHeight;
-                        pData->CurrentDisplayDevice->InitialSettings.dmBitsPerPel =
devmode.dmBitsPerPel;
-                       
pData->CurrentDisplayDevice->InitialSettings.dmDisplayFrequency =
devmode.dmDisplayFrequency;
-                       
pData->CurrentDisplayDevice->CurrentSettings->dmPelsWidth =
pData->CurrentDisplayDevice->InitialSettings.dmPelsWidth;
-                       
pData->CurrentDisplayDevice->CurrentSettings->dmPelsHeight =
pData->CurrentDisplayDevice->InitialSettings.dmPelsHeight;
-                       
pData->CurrentDisplayDevice->CurrentSettings->dmBitsPerPel =
pData->CurrentDisplayDevice->InitialSettings.dmBitsPerPel;
-                       
pData->CurrentDisplayDevice->CurrentSettings->dmDisplayFrequency =
pData->CurrentDisplayDevice->InitialSettings.dmDisplayFrequency;
+                        PSETTINGS_ENTRY pInitialSettings =
&pData->CurrentDisplayDevice->InitialSettings;
+                        pInitialSettings->dmPelsWidth = devmode.dmPelsWidth;
+                        pInitialSettings->dmPelsHeight = devmode.dmPelsHeight;
+                        pInitialSettings->dmBitsPerPel = devmode.dmBitsPerPel;
+                        pInitialSettings->dmDisplayFrequency =
devmode.dmDisplayFrequency;
+                        pData->CurrentDisplayDevice->CurrentSettings =
+                            FindBestElement(pData->CurrentDisplayDevice);
                         UpdateDisplay(hwndDlg, pData, TRUE);
                     }
                 }