Add implementation for fl_read_image() on OSX (STR #161)

Update changelog and announcement.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@3096 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 82 insertions, 3 deletions

diff --git a/src/fl_read_image_mac.cxx b/src/fl_read_image_mac.cxx
index 551a6688d..b00dc1964 100644
--- a/src/fl_read_image_mac.cxx
+++ b/src/fl_read_image_mac.cxx
@@ -1,5 +1,5 @@
 //
-// "$Id: fl_read_image_mac.cxx,v 1.1.2.2 2003/01/30 21:44:03 easysw Exp $"
+// "$Id: fl_read_image_mac.cxx,v 1.1.2.3 2003/09/08 17:30:06 easysw Exp $"
 //
 // WIN32 image reading routines for the Fast Light Tool Kit (FLTK).
 //
@@ -34,10 +34,89 @@ fl_read_image(uchar *p,		// I - Pixel buffer or NULL to allocate
 	      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)
-  return 0;
+  Rect		src,		// Source rectangle
+		dst;		// Destination rectangle
+  Fl_Offscreen	osbuffer;	// Temporary off-screen buffer for copy
+  GrafPtr	srcPort,	// Source port
+		dstPort;	// Destination port
+  RGBColor	rgb;		// RGB colors for copy mask...
+  PixMapHandle	pm;		// Pixmap handle for off-screen buffer
+  uchar		*base,		// Base address of off-screen buffer
+		*psrc,		// Pointer into off-screen buffer
+		*pdst;		// Pointer into pixel buffer
+  int           x, y;		// Current X & Y in image
+  int		d;		// Depth of image
+  int		rowBytes;	// Number of bytes per row...
+
+
+  // Get an off-screen buffer for copying the image...
+  osbuffer = fl_create_offscreen(w,h);
+
+  if (!osbuffer) return 0;
+
+  // Set the source and destination rectangles...
+  src.top    = y;
+  src.left   = x;
+  src.bottom = y + h;
+  src.right  = x + w;
+
+  dst.top    = 0;
+  dst.left   = 0;
+  dst.bottom = h;
+  dst.right  = w;
+
+  // Get the source port...
+  GetPort(&srcPort);
+
+  // Set the RGB copy mask via the foreground/background colors...
+  rgb.red   = 0xffff;
+  rgb.green = 0xffff;
+  rgb.blue  = 0xffff;
+  RGBBackColor(&rgb);
+
+  rgb.red   = 0x0000;
+  rgb.green = 0x0000;
+  rgb.blue  = 0x0000;
+  RGBForeColor(&rgb);
+
+  // Copy the screen image to the off-screen buffer...
+  CopyBits(GetPortBitMapForCopyBits(srcPort),
+           GetPortBitMapForCopyBits(osbuffer), &src, &dst, srcCopy, 0L);
+
+  // 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);
+
+  // Set the correct port for the off-screen buffer and lock the buffer
+  SetGWorld(osbuffer, 0);
+
+  pm = GetGWorldPixMap(osbuffer);
+  LockPixels(pm);
+
+  base     = (uchar *)GetPixBaseAddr(pm);
+  rowBytes = (*pm)->rowBytes & 0x3fff;
+
+  // Copy the image from the off-screen buffer to the memory buffer.
+  for (y = 0, pdst = p; y < h; y ++)
+    for (x = 0, psrc = base + y * rowBytes + 1; x < w; x ++, psrc += 4, pdst += d) {
+      pdst[0] = psrc[0];
+      pdst[1] = psrc[1];
+      pdst[2] = psrc[2];
+    }
+  }
+
+  // Unlock and delete the off-screen buffer, then return...
+  UnlockPixels(pm);
+  fl_delete_offscreen(osbuffer);
+
+  return p;
 }
 
 
 //
-// End of "$Id: fl_read_image_mac.cxx,v 1.1.2.2 2003/01/30 21:44:03 easysw Exp $".
+// End of "$Id: fl_read_image_mac.cxx,v 1.1.2.3 2003/09/08 17:30:06 easysw Exp $".
 //