Consolidate pixel conversion into the PixelFormat class and optimise the

common cases.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3636 3789f03b-4d11-0410-bbf8-ca57d06f2519

1 files changed, 92 insertions, 0 deletions

diff --git a/common/rfb/PixelFormat.inl b/common/rfb/PixelFormat.inl
new file mode 100644
index 00000000..faffc658
--- /dev/null
+++ b/common/rfb/PixelFormat.inl
@@ -0,0 +1,92 @@
+/* Copyright 2009 Pierre Ossman for Cendio AB
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+namespace rfb {
+
+
+inline Pixel PixelFormat::pixelFromBuffer(const rdr::U8* buffer) const
+{
+  Pixel p;
+
+  p = 0;
+
+  if (bigEndian) {
+    switch (bpp) {
+    case 32:
+      p |= ((Pixel)*(buffer++)) << 24;
+      p |= ((Pixel)*(buffer++)) << 16;
+    case 16:
+      p |= ((Pixel)*(buffer++)) << 8;
+    case 8:
+      p |= *buffer;
+    }
+  } else {
+    p |= buffer[0];
+    if (bpp >= 16) {
+      p |= ((Pixel)buffer[1]) << 8;
+      if (bpp == 32)
+        p |= ((Pixel)buffer[2]) << 16;
+    }
+  }
+
+  return p;
+}
+
+
+inline void PixelFormat::rgbFromPixel(Pixel p, ColourMap* cm, rdr::U16 *r, rdr::U16 *g, rdr::U16 *b) const
+{
+  if (trueColour) {
+    /* We don't need to mask since we shift out unwanted bits */
+    *r = (p >> redShift) << redConvShift;
+    *g = (p >> greenShift) << greenConvShift;
+    *b = (p >> blueShift) << blueConvShift;
+  } else if (cm) {
+    int ir, ig, ib;
+    cm->lookup(p, &ir, &ig, &ib);
+    *r = ir;
+    *g = ig;
+    *b = ib;
+  } else {
+    // XXX just return 0 for colour map?
+    *r = 0;
+    *g = 0;
+    *b = 0;
+  }
+}
+
+
+inline void PixelFormat::rgbFromPixel(Pixel p, ColourMap* cm, rdr::U8 *r, rdr::U8 *g, rdr::U8 *b) const
+{
+  if (trueColour) {
+    *r = (p >> redShift) << (redConvShift - 8);
+    *g = (p >> greenShift) << (greenConvShift - 8);
+    *b = (p >> blueShift) << (blueConvShift - 8);
+  } else {
+    rdr::U16 r2, g2, b2;
+
+    rgbFromPixel(p, cm, &r2, &g2, &b2);
+
+    *r = r2 >> 8;
+    *g = g2 >> 8;
+    *b = b2 >> 8;
+  }
+}
+
+
+}
+