DisplayScalingMode
Demonstrates how to obtain the display scaling mode when programming with ADLX and perform related operations.
Command Prompts
| Command Prompt | Description |
|---|---|
| 1 | Display scaling mode support. |
| 2 | Get scaling mode state. |
| 3 | Set current scaling mode to PRESERVE_ASPECT_RATIO. |
| 4 | Set current scaling mode to FULL_PANEL. |
| 5 | Set current scaling mode to CENTERED. |
| M/m | Display the command prompt menu. |
| Q/q | Terminate the application. |
Sample Path
/Samples/C/Display/DisplayScalingMode
Code
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//
// Copyright (c) 2021 - 2025 Advanced Micro Devices, Inc. All rights reserved.
//
//-------------------------------------------------------------------------------------------------
#include "SDK/ADLXHelper/Windows/C/ADLXHelper.h"
#include "SDK/Include/IDisplaySettings.h"
#include "SDK/Include/IDisplays.h"
// Display displayScalingMode support
void ShowDisplayScalingModeSupport(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay);
// Display current displayScalingMode state
void GetScalingModeState(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay);
// Set displayScalingMode
void SetScalingModeState(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay, const int key);
// Main menu
void MainMenu();
// Menu action control
void MenuControl(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay);
// Wait for exit with error message
int WaitAndExit(const char* msg, const int retCode);
int main()
{
// Define return code
ADLX_RESULT res = ADLX_FAIL ;
// Initialize ADLX
res = ADLXHelper_Initialize();
if (ADLX_SUCCEEDED (res))
{
// Get system service
IADLXSystem* sys = ADLXHelper_GetSystemServices();
// Get display service
IADLXDisplayServices* displayService = NULL;
res = sys->pVtbl->GetDisplaysServices(sys, &displayService);
if (ADLX_SUCCEEDED (res))
{
// Get display list
IADLXDisplayList* displayList = NULL;
res = displayService->pVtbl->GetDisplays(displayService, &displayList);
if (ADLX_SUCCEEDED (res))
{
// Inspect for the first display in the list
adlx_uint it = 0;
IADLXDisplay* display = NULL;
res = displayList->pVtbl->At_DisplayList(displayList, it, &display);
if (ADLX_SUCCEEDED (res))
{
// Display main menu options
MainMenu();
// Get and execute the choice
MenuControl(displayService, display);
}
// Release the display interface
if (NULL != display)
{
display->pVtbl->Release(display);
display = NULL;
}
}
// Release the displayList interface
if (NULL != displayList)
{
displayList->pVtbl->Release(displayList);
displayList = NULL;
}
}
// Release the displayService interface
if (NULL != displayService)
{
displayService->pVtbl->Release(displayService);
displayService = NULL;
}
}
else
{
return WaitAndExit("ADLX initialization failed", 0);
}
// Destroy ADLX
res = ADLXHelper_Terminate();
printf("Destroy ADLX result: %d\\n", res);
// Pause to see the print out
system("pause");
return 0;
}
void ShowDisplayScalingModeSupport(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay)
{
IADLXDisplayScalingMode* pDisplayScalingMode = NULL;
ADLX_RESULT res = pDisplayService->pVtbl->GetScalingMode(pDisplayService, pDisplay, &pDisplayScalingMode);
if (ADLX_SUCCEEDED (res))
{
printf(" === Get scaling mode supported ===\\n");
adlx_bool supported = false;
res = pDisplayScalingMode->pVtbl->IsSupported(pDisplayScalingMode, &supported);
printf("\\tScaling mode is supported on the display: %s , return code: %d (0 means success)\\n", supported ? "true" : "false", res);
pDisplayScalingMode->pVtbl->Release(pDisplayScalingMode);
}
}
void GetScalingModeState(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay)
{
IADLXDisplayScalingMode* pDisplayScalingMode = NULL;
ADLX_RESULT res = pDisplayService->pVtbl->GetScalingMode(pDisplayService, pDisplay, &pDisplayScalingMode);
if (ADLX_SUCCEEDED (res))
{
printf(" === Get scaling-mode mode ===\\n");
ADLX_SCALE_MODE sm = PRESERVE_ASPECT_RATIO ;
res = pDisplayScalingMode->pVtbl->GetMode(pDisplayScalingMode, &sm);
char* smStr = "Unknown";
switch (sm)
{
case PRESERVE_ASPECT_RATIO :
smStr = "PRESERVE_ASPECT_RATIO";
break;
case FULL_PANEL :
smStr = "FULL_PANEL";
break;
case CENTERED :
smStr = "CENTERED";
break;
}
printf("\\tThe scaling mode on the display is %s , return code: %d (0 means success)\\n", smStr, res);
pDisplayScalingMode->pVtbl->Release(pDisplayScalingMode);
}
}
void SetScalingModeState(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay, const int key)
{
IADLXDisplayScalingMode* pDisplayScalingMode = NULL;
ADLX_RESULT res = pDisplayService->pVtbl->GetScalingMode(pDisplayService, pDisplay, &pDisplayScalingMode);
if (ADLX_SUCCEEDED (res))
{
ADLX_RESULT res = ADLX_FAIL ;
switch (key)
{
// Set scaling mode to PRESERVE_ASPECT_RATIO
case 0:
printf(" === Set scaling mode to PRESERVE_ASPECT_RATIO ===\\n");
res = pDisplayScalingMode->pVtbl->SetMode(pDisplayScalingMode, PRESERVE_ASPECT_RATIO );
break;
// Set scaling mode to FULL_PANEL
case 1:
printf(" === Set scaling mode to FULL_PANEL ===\\n");
res = pDisplayScalingMode->pVtbl->SetMode(pDisplayScalingMode, FULL_PANEL );
break;
// set ScalingMode CENTERED
case 2:
printf(" === Set scaling mode to CENTERED ===\\n");
res = pDisplayScalingMode->pVtbl->SetMode(pDisplayScalingMode, CENTERED );
break;
default:
break;
}
printf("\\treturn code is: %d (0 means success)\\n", res);
pDisplayScalingMode->pVtbl->Release(pDisplayScalingMode);
}
}
void MainMenu()
{
printf("\\tChoose from the following options:\\n");
printf("\\t->Press 1 to Display scaling mode support\\n");
printf("\\t->Press 2 to get scaling mode state\\n");
printf("\\t->Press 3 to set current scaling mode to PRESERVE_ASPECT_RATIO\\n");
printf("\\t->Press 4 to set current scaling mode to FULL_PANEL\\n");
printf("\\t->Press 5 to set current scaling mode to CENTERED\\n");
printf("\\t->Press Q/q to terminate the application\\n");
printf("\\t->Press M/m to display the main menu options\\n");
}
// Menu action control
void MenuControl(IADLXDisplayServices* pDisplayService, IADLXDisplay* pDisplay)
{
int num = 0;
while ((num = getchar()) != 'q' && num != 'Q')
{
switch (num)
{
// Display displayScalingMode support
case '1':
ShowDisplayScalingModeSupport(pDisplayService, pDisplay);
break;
// Display current displayScalingMode state
case '2':
GetScalingModeState(pDisplayService, pDisplay);
break;
// Set displayScalingMode
case '3':
case '4':
case '5':
SetScalingModeState(pDisplayService, pDisplay, num - '3');
break;
// Display main menu options
case 'm':
case 'M':
MainMenu();
break;
default:
break;
}
}
}
// Wait for exit with error message
int WaitAndExit(const char* msg, const int retCode)
{
// Printout the message and pause to see it before returning the desired code
if (NULL != msg)
printf("%s\\n", msg);
system("pause");
return retCode;
}
