[GSport-svn] SF.net SVN: gsport:[354] trunk/src/imagewriter.cpp

[<cgm...@us...>]

Revision: 354
          http://sourceforge.net/p/gsport/code/354
Author:   cgmason14
Date:     2015-02-04 05:39:25 +0000 (Wed, 04 Feb 2015)
Log Message:
-----------
Fix page margins in Windows once and for all. Clip the source bitmap by the equivalent amount given by the printer driver. Also set the default left margin of the emulated Imagewriter to 1/4 inch.

Modified Paths:
--------------
    trunk/src/imagewriter.cpp

Modified: trunk/src/imagewriter.cpp
===================================================================
--- trunk/src/imagewriter.cpp	2015-02-03 00:02:45 UTC (rev 353)
+++ trunk/src/imagewriter.cpp	2015-02-04 05:39:25 UTC (rev 354)
@@ -246,7 +246,7 @@
 		ESCCmd = 0;
 		numParam = neededParam = 0;
 		topMargin = 0.0;
-		leftMargin = 0.0;
+		leftMargin = 0.25; //Most all Apple II software including GS/OS assume a 1/4 inch margin on an Imagewriter
 		rightMargin = pageWidth = defaultPageWidth;
 		bottomMargin = pageHeight = defaultPageHeight;
 		lineSpacing = (Real64)1/6;
@@ -1628,21 +1628,16 @@
 
 		Bit16u physW = GetDeviceCaps(printerDC, PHYSICALWIDTH);
 		Bit16u physH = GetDeviceCaps(printerDC, PHYSICALHEIGHT);
-		Bit16u offsetW = GetDeviceCaps(printerDC, PHYSICALOFFSETX);
-		Bit16u offsetH = GetDeviceCaps(printerDC, PHYSICALOFFSETY);
-
-		Real64 scaleW, scaleH;
-
-		if (page->w > physW) 
-	        scaleW = (Real64)page->w / (Real64)physW;
-	    else 
-			scaleW = (Real64)physW / (Real64)page->w; 
- 
-		if (page->h > physH) 
-	        scaleH = (Real64)page->h / (Real64)physH;
-	    else 
-			scaleH = (Real64)physH / (Real64)page->h; 
-
+		Bit16u printeroffsetW = GetDeviceCaps(printerDC, PHYSICALOFFSETX);  //printer x offset in actual pixels
+		Bit16u printeroffsetH = GetDeviceCaps(printerDC, PHYSICALOFFSETY); //printer y offset in actual pixels
+		Bit16u deviceDPIW = GetDeviceCaps(printerDC, LOGPIXELSX);
+		Bit16u deviceDPIH = GetDeviceCaps(printerDC, LOGPIXELSY);
+		Real64 physoffsetW = (Real64)printeroffsetW/deviceDPIW; //printer x offset in inches
+		Real64 physoffsetH = (Real64)printeroffsetH/deviceDPIH; //printer y offset in inches
+		Bit16u dpiW = page->w/defaultPageWidth; //Get currently set DPI of the emulated printer in an indirect way
+		Bit16u dpiH = page->h/defaultPageHeight;
+		Real64 soffsetW = physoffsetW*dpiW; //virtual page x offset in actual pixels
+		Real64 soffsetH = physoffsetH*dpiH; //virtual page y offset in actual pixels
 		HDC memHDC = CreateCompatibleDC(printerDC);
 		BITMAPINFO *BitmapInfo;
 		HBITMAP bitmap;
@@ -1697,7 +1692,7 @@
             memcpy (Pixels, page->pixels,
 		    BitmapInfo->bmiHeader.biSizeImage);
             Prev = SelectObject (memHDC, bitmap);
-			StretchBlt(printerDC, -offsetW, -offsetH, physW, physH, memHDC, 0, 0, page->w, page->h, SRCCOPY);
+			StretchBlt(printerDC, 0, 0, physW, physH, memHDC, soffsetW, soffsetH, page->w, page->h, SRCCOPY);
             SelectObject (memHDC,Prev);
             DeleteObject (bitmap);
           }

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