Added fl_create_deepmask() method for creating alpha blend masks.

Implemented Fl_RGB_Image alpha blending for MacOS X - others still
get 1-bit screen-door transparency...


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2083 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 23 insertions, 68 deletions

diff --git a/src/Fl_Image.cxx b/src/Fl_Image.cxx
index e1dfea76c..50e7c194d 100644
--- a/src/Fl_Image.cxx
+++ b/src/Fl_Image.cxx
@@ -1,5 +1,5 @@
 //
-// "$Id: Fl_Image.cxx,v 1.5.2.3.2.16 2002/04/11 11:52:41 easysw Exp $"
+// "$Id: Fl_Image.cxx,v 1.5.2.3.2.17 2002/04/14 21:26:06 easysw Exp $"
 //
 // Image drawing code for the Fast Light Tool Kit (FLTK).
 //
@@ -263,75 +263,12 @@ void Fl_RGB_Image::draw(int XP, int YP, int WP, int HP, int cx, int cy) {
   if (H <= 0) return;
   if (!id) {
     id = fl_create_offscreen(w(), h());
-    fl_begin_offscreen((Fl_Offscreen)id);
+    fl_begin_offscreen(id);
     fl_draw_image(array, 0, 0, w(), h(), d(), ld());
     fl_end_offscreen();
 
     if (d() == 2 || d() == 4) {
-      // Create alpha mask...
-      int bmw = (w() + 7) / 8;
-      uchar *bitmap = new uchar[bmw * h()];
-      uchar *bitptr, bit;
-      const uchar *dataptr;
-      int x, y;
-      static uchar dither[16][16] = { // Simple 16x16 Floyd dither
-	{ 0,   128, 32,  160, 8,   136, 40,  168,
-	  2,   130, 34,  162, 10,  138, 42,  170 },
-	{ 192, 64,  224, 96,  200, 72,  232, 104,
-	  194, 66,  226, 98,  202, 74,  234, 106 },
-	{ 48,  176, 16,  144, 56,  184, 24,  152,
-	  50,  178, 18,  146, 58,  186, 26,  154 },
-	{ 240, 112, 208, 80,  248, 120, 216, 88,
-	  242, 114, 210, 82,  250, 122, 218, 90 },
-	{ 12,  140, 44,  172, 4,   132, 36,  164,
-	  14,  142, 46,  174, 6,   134, 38,  166 },
-	{ 204, 76,  236, 108, 196, 68,  228, 100,
-	  206, 78,  238, 110, 198, 70,  230, 102 },
-	{ 60,  188, 28,  156, 52,  180, 20,  148,
-	  62,  190, 30,  158, 54,  182, 22,  150 },
-	{ 252, 124, 220, 92,  244, 116, 212, 84,
-	  254, 126, 222, 94,  246, 118, 214, 86 },
-	{ 3,   131, 35,  163, 11,  139, 43,  171,
-	  1,   129, 33,  161, 9,   137, 41,  169 },
-	{ 195, 67,  227, 99,  203, 75,  235, 107,
-	  193, 65,  225, 97,  201, 73,  233, 105 },
-	{ 51,  179, 19,  147, 59,  187, 27,  155,
-	  49,  177, 17,  145, 57,  185, 25,  153 },
-	{ 243, 115, 211, 83,  251, 123, 219, 91,
-	  241, 113, 209, 81,  249, 121, 217, 89 },
-	{ 15,  143, 47,  175, 7,   135, 39,  167,
-	  13,  141, 45,  173, 5,   133, 37,  165 },
-	{ 207, 79,  239, 111, 199, 71,  231, 103,
-	  205, 77,  237, 109, 197, 69,  229, 101 },
-	{ 63,  191, 31,  159, 55,  183, 23,  151,
-	  61,  189, 29,  157, 53,  181, 21,  149 },
-	{ 254, 127, 223, 95,  247, 119, 215, 87,
-	  253, 125, 221, 93,  245, 117, 213, 85 }
-      };
-
-      // Right now do a "screen door" alpha mask; not always pretty, but
-      // definitely fast...  In the future we should look at supporting
-      // the RENDER extension in XFree86, when available, to provide
-      // true RGBA-blended rendering.  See:
-      //
-      //     http://www.xfree86.org/~keithp/render/protocol.html
-      //
-      // for more info...
-      memset(bitmap, 0, bmw * h());
-
-      for (dataptr = array + d() - 1, y = 0; y < h(); y ++, dataptr += ld())
-        for (bitptr = bitmap + y * bmw, bit = 1, x = 0; x < w(); x ++, dataptr += d()) {
-	  if (*dataptr > dither[x & 15][y & 15])
-	    *bitptr |= bit;
-	  if (bit < 128) bit <<= 1;
-	  else {
-	    bit = 1;
-	    bitptr ++;
-	  }
-	}
-
-      mask = fl_create_bitmask(w(), h(), bitmap);
-      delete[] bitmap;
+      mask = fl_create_deepmask(w(), h(), d(), ld(), array);
     }
   }
 #ifdef WIN32
@@ -346,8 +283,26 @@ void Fl_RGB_Image::draw(int XP, int YP, int WP, int HP, int cx, int cy) {
     fl_copy_offscreen(X, Y, W, H, id, cx, cy);
   }
 #elif defined(__APPLE__)
-  // \todo Mac : alpha blending not yet implemented
   fl_copy_offscreen(X, Y, W, H, id, cx, cy);
+
+  if (mask) {
+    Rect src, dst;
+    src.left = 0; src.right = w();
+    src.top = 0; src.bottom = h();
+    dst.left = X; dst.right = X+w();
+    dst.top = Y; dst.bottom = Y+h();
+    RGBColor rgb;
+    rgb.red = 0xffff; rgb.green = 0xffff; rgb.blue = 0xffff;
+    RGBBackColor(&rgb);
+    rgb.red = 0x0000; rgb.green = 0x0000; rgb.blue = 0x0000;
+    RGBForeColor(&rgb);
+    CopyDeepMask(GetPortBitMapForCopyBits((GrafPtr)id),
+	         GetPortBitMapForCopyBits((GrafPtr)mask), 
+	         GetPortBitMapForCopyBits(GetWindowPort(fl_window)),
+                 &src, &src, &dst, blend, NULL);
+  } else {
+    fl_copy_offscreen(X, Y, W, H, id, cx, cy);
+  }
 #else
   if (mask) {
     // I can't figure out how to combine a mask with existing region,
@@ -379,5 +334,5 @@ void Fl_RGB_Image::label(Fl_Menu_Item* m) {
 
 
 //
-// End of "$Id: Fl_Image.cxx,v 1.5.2.3.2.16 2002/04/11 11:52:41 easysw Exp $".
+// End of "$Id: Fl_Image.cxx,v 1.5.2.3.2.17 2002/04/14 21:26:06 easysw Exp $".
 //