Changes to black compression and saturation controls. Black compression from 0-50 acts the same as 0-100 on the previous version, compressing dark tones without crushing blacks. 50-100 then starts crushing blacks until by 100 on the slider, all tones up to the set black point are sent to zero. In the new saturation control, negative values of the slider set a linear curve rather than an inverted S curve, and smoothly decrease saturation to zero across the board.

rtengine/image8.cc

@@ -0,0 +1,108 @@
+/*
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
+ *
+ *  RawTherapee 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 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <image8.h>
+#include <rtengine.h>
+
+using namespace rtengine;
+
+
+Image8::Image8 () 
+  : data(NULL), width(-1), height(-1) {
+}
+
+Image8::Image8 (int w, int h) 
+  : data(NULL), width(w), height (h) {
+  
+    allocate (w, h);
+}
+
+void Image8::allocate (int width, int height) {
+
+    if (data!=NULL) 
+        delete [] data;
+  
+    data = new unsigned char [width * height * 3];
+    this->width = width;
+    this->height = height;
+}
+
+Image8::~Image8 () {
+  
+    if (data!=NULL) 
+        delete [] data;
+}
+
+void Image8::getScanline (int row, unsigned char* buffer, int bps) {
+
+    if (data==NULL)
+        return;
+
+    if (bps==8)
+        memcpy (buffer, data + row*width*3, width*3);
+    else if (bps==16) {
+        unsigned short* sbuffer = (unsigned short*) buffer;
+        for (int i=0, ix = row*width*3; i<width*3; i++, ix++)
+         sbuffer[i] =  data[ix] << 8;
+    }
+}
+
+void Image8::setScanline (int row, unsigned char* buffer, int bps) {
+
+    if (data==NULL)
+        return;
+
+    if (bps==8)
+        memcpy (data + row*width*3, buffer, width*3);
+    else if (bps==16) {
+        unsigned short* sbuffer = (unsigned short*) buffer;
+        for (int i=0, ix = row*width*3; i<width*3; i++, ix++)
+          data[ix] = sbuffer[i] >> 8;
+    }
+}
+
+unsigned char Image8::r (int row, int col) {
+
+    return data[3*(row*width+col)];
+}
+
+unsigned char Image8::g (int row, int col) {
+
+    return data[3*(row*width+col)+1];
+}
+
+unsigned char Image8::b (int row, int col) {
+
+    return data[3*(row*width+col)+2];
+}
+
+void Image8::r (int row, int col, unsigned char val) {
+
+    data[3*(row*width+col)] = val;
+}
+
+void Image8::g (int row, int col, unsigned char val) {
+
+    data[3*(row*width+col)+1] = val;
+}
+
+void Image8::b (int row, int col, unsigned char val) {
+
+    data[3*(row*width+col)+2] = val;
+}
+