From f1ffe2f1fee001ffb3c9327c6c09f5e5d9dc91de Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sun, 3 Apr 2016 06:51:09 +0000
Subject: Rewrite fl_read_image.cxx under the driver model.

Files fl_read_image_mac.cxx and fl_read_image_win32.cxx are no longer used;
their content is now in Fl_XXX_Screen_Driver.cxx

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11516 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx | 100 +++++++++++++++++++++++++
 1 file changed, 100 insertions(+)

(limited to 'src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx')

diff --git a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
index 7dd7df843..bf49eebd8 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
@@ -553,6 +553,106 @@ void Fl_Screen_Driver::font_name(int num, const char *name) {
   s->first = 0;
 }
 
+
+uchar *				// O - Pixel buffer or NULL if failed
+Fl_WinAPI_Screen_Driver::read_win_rectangle(uchar *p,		// I - Pixel buffer or NULL to allocate
+                                            int   X,		// I - Left position
+                                            int   Y,		// I - Top position
+                                            int   w,		// I - Width of area to read
+                                            int   h,		// I - Height of area to read
+                                            int   alpha) 	// I - Alpha value for image (0 for none)
+{
+  int	d;			// Depth of image
+  
+  // Allocate the image data array as needed...
+  d = alpha ? 4 : 3;
+  
+  if (!p) p = new uchar[w * h * d];
+  
+  // Initialize the default colors/alpha in the whole image...
+  memset(p, alpha, w * h * d);
+  
+  // Grab all of the pixels in the image...
+  
+  // Assure that we are not trying to read non-existing data. If it is so, the
+  // function should still work, but the out-of-bounds part of the image is
+  // untouched (initialized with the alpha value or 0 (black), resp.).
+  
+  int ww = w; // We need the original width for output data line size
+  
+  int shift_x = 0; // X target shift if X modified
+  int shift_y = 0; // Y target shift if X modified
+  
+  if (X < 0) {
+    shift_x = -X;
+    w += X;
+    X = 0;
+  }
+  if (Y < 0) {
+    shift_y = -Y;
+    h += Y;
+    Y = 0;
+  }
+  
+  if (h < 1 || w < 1) return p;		// nothing to copy
+  
+  int line_size = ((3*w+3)/4) * 4;	// each line is aligned on a DWORD (4 bytes)
+  uchar *dib = new uchar[line_size*h];	// create temporary buffer to read DIB
+  
+  // fill in bitmap info for GetDIBits
+  
+  BITMAPINFO   bi;
+  bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+  bi.bmiHeader.biWidth = w;
+  bi.bmiHeader.biHeight = -h;		// negative => top-down DIB
+  bi.bmiHeader.biPlanes = 1;
+  bi.bmiHeader.biBitCount = 24;		// 24 bits RGB
+  bi.bmiHeader.biCompression = BI_RGB;
+  bi.bmiHeader.biSizeImage = 0;
+  bi.bmiHeader.biXPelsPerMeter = 0;
+  bi.bmiHeader.biYPelsPerMeter = 0;
+  bi.bmiHeader.biClrUsed = 0;
+  bi.bmiHeader.biClrImportant = 0;
+  
+  // copy bitmap from original DC (Window, Fl_Offscreen, ...)
+  HDC gc = (HDC)fl_graphics_driver->gc();
+  HDC hdc = CreateCompatibleDC(gc);
+  HBITMAP hbm = CreateCompatibleBitmap(gc,w,h);
+  
+  int save_dc = SaveDC(hdc);			// save context for cleanup
+  SelectObject(hdc,hbm);			// select bitmap
+  BitBlt(hdc,0,0,w,h,gc,X,Y,SRCCOPY);	// copy image section to DDB
+  
+  // copy RGB image data to the allocated DIB
+  
+  GetDIBits(hdc, hbm, 0, h, dib, (BITMAPINFO *)&bi, DIB_RGB_COLORS);
+  
+  // finally copy the image data to the user buffer
+  
+  for (int j = 0; j<h; j++) {
+    const uchar *src = dib + j * line_size;			// source line
+    uchar *tg = p + (j + shift_y) * d * ww + shift_x * d;	// target line
+    for (int i = 0; i<w; i++) {
+      uchar b = *src++;
+      uchar g = *src++;
+      *tg++ = *src++;	// R
+      *tg++ = g;	// G
+      *tg++ = b;	// B
+      if (alpha)
+        *tg++ = alpha;	// alpha
+    }
+  }
+  
+  // free used GDI and other structures
+  
+  RestoreDC(hdc,save_dc);	// reset DC
+  DeleteDC(hdc);
+  DeleteObject(hbm);
+  delete[] dib;		// delete DIB temporary buffer
+  
+  return p;
+}
+
 //
 // End of "$Id$".
 //
\ No newline at end of file
-- 
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