request physical desktop resolution

windows-snapshot-tool/src/ShellScalingApi.h

@@ -0,0 +1,80 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+
+#ifndef _SHELLSCALINGAPI_H_
+#define _SHELLSCALINGAPI_H_
+
+#include <shtypes.h>
+#include <winapifamily.h>
+
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+
+#ifndef SCALING_ENUMS_DECLARED
+typedef enum {
+  SCF_VALUE_NONE = 0x00,
+  SCF_SCALE = 0x01,
+  SCF_PHYSICAL = 0x02
+} SCALE_CHANGE_FLAGS;
+DEFINE_ENUM_FLAG_OPERATORS(SCALE_CHANGE_FLAGS);
+
+typedef enum {
+  DEVICE_PRIMARY = 0,
+  DEVICE_IMMERSIVE = 1
+} DISPLAY_DEVICE_TYPE;
+
+#define SCALING_ENUMS_DECLARED
+#endif /* SCALING_ENUMS_DECLARED */
+
+#if NTDDI_VERSION >= NTDDI_WIN8
+STDAPI_(DEVICE_SCALE_FACTOR) GetScaleFactorForDevice(DISPLAY_DEVICE_TYPE deviceType);
+STDAPI RegisterScaleChangeNotifications(DISPLAY_DEVICE_TYPE displayDevice, HWND hwndNotify, UINT uMsgNotify,
+  DWORD *pdwCookie);
+STDAPI RevokeScaleChangeNotifications(DISPLAY_DEVICE_TYPE displayDevice, DWORD dwCookie);
+#endif /* NTDDI_VERSION >= NTDDI_WIN8 */
+
+#ifndef DPI_ENUMS_DECLARED
+typedef enum MONITOR_DPI_TYPE {
+  MDT_EFFECTIVE_DPI = 0,
+  MDT_ANGULAR_DPI = 1,
+  MDT_RAW_DPI = 2,
+  MDT_DEFAULT = MDT_EFFECTIVE_DPI
+} MONITOR_DPI_TYPE;
+
+typedef enum PROCESS_DPI_AWARENESS {
+  PROCESS_DPI_UNAWARE = 0,
+  PROCESS_SYSTEM_DPI_AWARE = 1,
+  PROCESS_PER_MONITOR_DPI_AWARE = 2
+} PROCESS_DPI_AWARENESS;
+
+#define DPI_ENUMS_DECLARED
+#endif /* DPI_ENUMS_DECLARED */
+
+#if NTDDI_VERSION >= NTDDI_WINBLUE
+STDAPI GetScaleFactorForMonitor(HMONITOR hMon, DEVICE_SCALE_FACTOR *pScale);
+STDAPI RegisterScaleChangeEvent(HANDLE hEvent, DWORD_PTR *pdwCookie);
+STDAPI UnregisterScaleChangeEvent(DWORD_PTR dwCookie);
+
+STDAPI GetDpiForMonitor(HMONITOR hmonitor, MONITOR_DPI_TYPE dpiType, UINT *dpiX, UINT *dpiY);
+STDAPI GetProcessDpiAwareness(HANDLE hprocess, PROCESS_DPI_AWARENESS *value);
+STDAPI SetProcessDpiAwareness(PROCESS_DPI_AWARENESS value);
+#endif /* NTDDI_VERSION >= NTDDI_WINBLUE */
+
+#if NTDDI_VERSION >= NTDDI_WINTHRESHOLD
+#ifndef SHELL_UI_COMPONENT_ENUMS_DECLARED
+typedef enum {
+  SHELL_UI_COMPONENT_TASKBARS = 0,
+  SHELL_UI_COMPONENT_NOTIFICATIONAREA = 1,
+  SHELL_UI_COMPONENT_DESKBAND = 2
+} SHELL_UI_COMPONENT;
+
+#define SHELL_UI_COMPONENT_ENUMS_DECLARED
+#endif /* SHELL_UI_COMPONENT_ENUMS_DECLARED */
+
+UINT WINAPI GetDpiForShellUIComponent(SHELL_UI_COMPONENT component);
+#endif /* NTDDI_VERSION >= NTDDI_WINTHRESHOLD */
+
+#endif /* WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) */
+#endif /* _SHELLSCALINGAPI_H_ */

windows-snapshot-tool/src/main.cpp

@@ -1,4 +1,7 @@
+//#define WIN32_LEAN_AND_MEAN  // Exclude rarely-used stuff from Windows headers
+//#include <windows.h>
 #include "resource.h"
+//#include <ShellScalingApi.h>
 #include <gdiplus.h>
 //#include "LimitSingleInstance.h"
 
@@ -30,6 +33,9 @@ int WINAPI WinMain (HINSTANCE hThisInstance,
                     LPSTR lpszArgument,
                     int nCmdShow)
 {
+//    SetProcessDPIAware();
+//    SetProcessDPIAwareness();
+
     // kill other already running instances
     HWND existingApp = FindWindow(0, szClassName);
     if (existingApp)
@@ -38,6 +44,12 @@ int WINAPI WinMain (HINSTANCE hThisInstance,
         Sleep(2000); // give the other App some time to clean up and close
     }
 
+    HDC screen = GetDC(0);
+    FLOAT dpiX, dpiY;
+    dpiX = static_cast<FLOAT>(GetDeviceCaps(screen, LOGPIXELSX));
+    dpiY = static_cast<FLOAT>(GetDeviceCaps(screen, LOGPIXELSY));
+    ReleaseDC(NULL,screen);
+
     /* This is the handle for our window */
     MSG messages;            /* Here messages to the application are saved */
     WNDCLASSEX wincl;        /* Data structure for the windowclass */
@@ -69,8 +81,8 @@ int WINAPI WinMain (HINSTANCE hThisInstance,
                WS_OVERLAPPEDWINDOW, /* default window */
                CW_USEDEFAULT,       /* Windows decides the position */
                CW_USEDEFAULT,       /* where the window ends up on the screen */
-               544,                 /* The programs width */
-               375,                 /* and height in pixels */
+               static_cast<INT>(dpiX * 544.f / 96.f),                 /* The programs width */
+               static_cast<INT>(dpiY * 375.f / 96.f),                 /* and height in pixels */
                HWND_DESKTOP,        /* The window is a child-window to desktop */
                NULL,                /* No menu */
                hThisInstance,       /* Program Instance handler */
@@ -348,6 +360,8 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
     HBITMAP hbmScreen = NULL;
     BITMAP bmpScreen;
 
+    SetProcessDPIAware();
+
     // Retrieve the handle to a display device context for the client 
     // area of the window. 
     hdcScreen = GetDC(NULL);
@@ -402,10 +416,18 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
         return -1;
     }
 
-    int width = GetDeviceCaps(hdcScreen, HORZRES);
-    int height = GetDeviceCaps(hdcScreen, VERTRES);
+    //int width = GetDeviceCaps(hdcScreen, HORZRES);
+    //int height = GetDeviceCaps(hdcScreen, VERTRES);
+    //int width_factor = GetDeviceCaps(hdcScreen, SCALINGFACTORX);
+    //int height_factor = GetDeviceCaps(hdcScreen, SCALINGFACTORY);
+    int desktop_width = GetDeviceCaps(hdcScreen, DESKTOPHORZRES);
+    int desktop_height = GetDeviceCaps(hdcScreen, DESKTOPVERTRES);
+
+    //wchar_t res_info[200];
+    //swprintf (res_info, 200-1, L"HORZRES: %d\nVERTRES: %d\nSCALINGFACTORX: %d\nSCALINGFACTORY: %d\nDESKTOPHORZRES: %d\nDESKTOPVERTZRES: %d\n", width, height, width_factor, height_factor, desktop_width, desktop_height);
+    //MessageBox(hWnd, res_info,L"Resolution info", MB_OK);
 
-    HBITMAP hBmp = CreateCompatibleBitmap(hdcScreen, width, height);
+    HBITMAP hBmp = CreateCompatibleBitmap(hdcScreen, desktop_width, desktop_height);
 
     // Select the compatible bitmap into the compatible memory DC.
     SelectObject(hdcMemDC,hBmp);
@@ -413,7 +435,7 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
     // Bit block transfer into our compatible memory DC.
     if(!BitBlt(hdcMemDC, 
                0,0,
-               width, height,
+               desktop_width, desktop_height,
                hdcScreen,
                0,0,
                SRCCOPY))