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

1 files changed, 45 insertions, 0 deletions

diff --git a/src/drivers/Cocoa/Fl_Cocoa_Screen_Driver.cxx b/src/drivers/Cocoa/Fl_Cocoa_Screen_Driver.cxx
index 2c9f693fc..c23046e30 100644
--- a/src/drivers/Cocoa/Fl_Cocoa_Screen_Driver.cxx
+++ b/src/drivers/Cocoa/Fl_Cocoa_Screen_Driver.cxx
@@ -325,6 +325,51 @@ void Fl_Screen_Driver::font_name(int num, const char *name) {
   s->first = 0;
 }
 
+uchar *                                                 // O - Pixel buffer or NULL if failed
+Fl_Cocoa_Screen_Driver::read_image(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)
+{
+  uchar *base;
+  int rowBytes, delta;
+  if (fl_window == NULL) { // reading from an offscreen buffer
+    CGContextRef src = (CGContextRef)Fl_Surface_Device::surface()->driver()->gc();  // get bitmap context
+    base = (uchar *)CGBitmapContextGetData(src);  // get data
+    if(!base) return NULL;
+    int sw = CGBitmapContextGetWidth(src);
+    int sh = CGBitmapContextGetHeight(src);
+    rowBytes = CGBitmapContextGetBytesPerRow(src);
+    delta = CGBitmapContextGetBitsPerPixel(src)/8;
+    if( (sw - x < w) || (sh - y < h) )  return NULL;
+  }
+  else { // reading from current window
+    base = Fl_X::bitmap_from_window_rect(Fl_Window::current(),x,y,w,h,&delta);
+    if (!base) return NULL;
+    rowBytes = delta*w;
+    x = y = 0;
+  }
+  // Allocate the image data array as needed...
+  int 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);
+  // Copy the image from the off-screen buffer to the memory buffer.
+  int           idx, idy;	// Current X & Y in image
+  uchar *pdst, *psrc;
+  for (idy = y, pdst = p; idy < h + y; idy ++) {
+    for (idx = 0, psrc = base + idy * rowBytes + x * delta; idx < w; idx ++, psrc += delta, pdst += d) {
+      pdst[0] = psrc[0];  // R
+      pdst[1] = psrc[1];  // G
+      pdst[2] = psrc[2];  // B
+    }
+  }
+  if(fl_window != NULL) delete[] base;
+  return p;
+}
+
 //
 // End of "$Id$".
 //