DPI scale from Blitz3D-NG

ZiYueCommentary · Dec 2, 2023 · 204bd15 · 204bd15
1 parent 27ec797
commit 204bd15
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Showing 4 changed files with 28 additions and 0 deletions.
diff --git a/bbruntime/bbgraphics.cpp b/bbruntime/bbgraphics.cpp
@@ -333,6 +333,16 @@ int  bbWindowed3D()
 	return (tc & gxRuntime::GFXMODECAPS_3D) ? 1 : 0;
 }
 
+float bbDPIScaleX() {
+	gx_runtime->calculateDPI();
+	return gx_runtime->scale_x;
+}
+
+float bbDPIScaleY() {
+	gx_runtime->calculateDPI();
+	return gx_runtime->scale_y;
+}
+
 int  bbTotalVidMem()
 {
 	return gx_graphics->getTotalVidmem();
@@ -1429,6 +1439,9 @@ void graphics_link(void (*rtSym)(const char* sym, void* pc))
 	rtSym("%AvailVidMem", bbAvailVidMem);
 	rtSym("%TotalVidMem", bbTotalVidMem);
 
+	rtSym("#DPIScaleX", bbDPIScaleX);
+	rtSym("#DPIScaleY", bbDPIScaleY);
+
 	rtSym("%GfxDriver3D%driver", bbGfxDriver3D);
 	rtSym("%CountGfxModes3D", bbCountGfxModes3D);
 	rtSym("%GfxMode3DExists%width%height%depth", bbGfxMode3DExists);

diff --git a/bbruntime/bbgraphics.h b/bbruntime/bbgraphics.h
@@ -24,6 +24,8 @@ int		 bbGraphicsHeight();
 int		 bbGraphicsDepth();
 int		 bbAvailVidMem();
 int		 bbTotalVidMem();
+float    bbDPIScaleX();
+float    bbDPIScaleY();
 
 //mode functions
 void	 bbGraphics(int w, int h, int d, int mode);

diff --git a/gxruntime/gxruntime.cpp b/gxruntime/gxruntime.cpp
@@ -1297,6 +1297,15 @@ std::string gxRuntime::systemProperty(const std::string& p) {
 	return "";
 }
 
+void gxRuntime::calculateDPI() {
+	if ((this->scale_x == .0f) && (this->scale_y == .0f)) {
+		HDC hdc = GetDC(GetDesktopWindow());
+		this->scale_x = GetDeviceCaps(hdc, LOGPIXELSX) / 96.0f;
+		this->scale_y = GetDeviceCaps(hdc, LOGPIXELSY) / 96.0f;
+		ReleaseDC(GetDesktopWindow(), hdc);
+	}
+}
+
 void gxRuntime::enableDirectInput(bool enable) {
 	if(use_di = enable) {
 		acquireInput();

diff --git a/gxruntime/gxruntime.h b/gxruntime/gxruntime.h
@@ -26,6 +26,8 @@ class gxRuntime {
 	gxGraphics* graphics;
 	gxFileSystem* fileSystem;
 
+	float scale_x = .0f, scale_y = .0f;
+
 	void flip(bool vwait);
 	void moveMouse(int x, int y);
 
@@ -142,6 +144,8 @@ class gxRuntime {
 	gxTimer* createTimer(int hertz);
 	void freeTimer(gxTimer* timer);
 
+	void calculateDPI();
+
 	void enableDirectInput(bool use);
 	int  directInputEnabled() { return use_di; }