1 files changed, 65 insertions, 0 deletions
diff --git a/src/rgbfilt/ftrgbgn2.h b/src/rgbfilt/ftrgbgn2.h
new file mode 100644
index 000000000..b3d9365cb
--- /dev/null
+++ b/src/rgbfilt/ftrgbgn2.h
@@ -0,0 +1,65 @@
+/* this file contains a template for the in-place RGB color filter algorithm
+ * it is included several times by "ftrgb.c"
+ */
+#ifndef OFF_R
+#error "OFF_R must be defined as the offset of the red channel"
+#endif
+
+#ifndef OFF_G
+#error "OFF_G must be defiend as the offset of the green channel"
+#endif
+
+#ifndef OFF_B
+#error "OFF_B must be defined as the offset of the blue channel"
+#endif
+
+#ifndef HMUL
+#error "HMUL must be defined as the horizontal multiplier, either 1 or 3"
+#endif
+
+#ifndef VMUL
+#error "VMUL must be defined as the vertical multipler, either 1 or 3"
+#endif
+
+
+  int        hh        = oper->height;
+  FT_Byte*   in_line   = oper->in_line;
+  FT_Long    in_pitch  = oper->in_pitch;
+  FT_Fixed*  mults     = oper->factors;
+
+  for ( ; hh > 0; hh--, in_line += in_pitch*VMUL )
+  {
+    int         ww    = oper->width;
+    FT_Byte*    pix  = in_line;
+
+    for ( ; ww > 0; ww--, pix += HMUL )
+    {
+      FT_UInt    rr, gg, bb;
+      FT_UInt    val;
+
+      val = pix[OFF_R];
+      rr  = mults[0]*val;
+      gg  = mults[3]*val;
+      bb  = mults[6]*val;
+
+      val = pix[OFF_G];
+      rr += mults[1]*val;
+      gg += mults[4]*val;
+      bb += mults[7]*val;
+
+      val = pix[OFF_B];
+      rr += mults[2]*val;
+      gg += mults[5]*val;
+      bb += mults[8]*val;
+
+      pix[OFF_R] = (FT_Byte)(rr >> 16);
+      pix[OFF_G] = (FT_Byte)(gg >> 16);
+      pix[OFF_B] = (FT_Byte)(bb >> 16);
+    }
+  }
+
+#undef  OFF_R
+#undef  OFF_G
+#undef  OFF_B
+#undef  HMUL
+#undef  VMUL