Pipette and "On Preview Widgets" branch. See issue 227

The pipette part is already working quite nice but need to be finished. The widgets part needs more work...

rtengine/alignedbuffer.h

@@ -0,0 +1,148 @@
+/*
+ *  This file is part of RawTherapee.
+ *
+*  Copyright (c) 2004-2012 Gabor Horvath <hgabor@rawtherapee.com>, Oliver Duis <oduis@oliverduis.de>
+ *
+ *  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/>.
+ */
+#ifndef _ALIGNEDBUFFER_
+#define _ALIGNEDBUFFER_
+#include <stdint.h>
+#include <cstdlib>
+#include <vector>
+#include <glibmm.h>
+#include "../rtgui/threadutils.h"
+
+// Aligned buffer that should be faster
+template <class T> class AlignedBuffer {
+
+private:
+    void* real ;
+    char alignment;
+    size_t allocatedSize;
+
+public:
+    T* data ;
+    bool inUse;
+
+    /* size is the number of elements of size T, i.e. allocated size will be sizeof(T)*size ; set it to 0 if you want to defer the allocation
+     * align is expressed in bytes; SSE instructions need 128 bits alignment, which mean 16 bytes, which is the default value
+     */
+    AlignedBuffer (size_t size=0, size_t align=16) : real(NULL), alignment(align), allocatedSize(0), data(NULL), inUse(false) {
+        if (size)
+            resize(size);
+    }
+
+    ~AlignedBuffer () {
+        if (real) free(real);
+    }
+
+    /* Allocate the the "size" amount of elements of "structSize" length each
+     * params:
+     * @size: number of elements to allocate
+     * @structSize: if non null, will let you override the default struct's size (unit: byte)
+     */
+    bool resize(size_t size, int structSize=0) {
+        if (allocatedSize != size) {
+            if (!size) {
+                // The user want to free the memory
+                if (real) free(real);
+                real = NULL;
+                data = NULL;
+                inUse = false;
+            }
+            else {
+                int sSize = structSize ? structSize : sizeof(T);
+                allocatedSize = size*sSize;
+                real = realloc(real, allocatedSize+alignment);
+                if (real) {
+                    //data = (T*)( (uintptr_t)real + (alignment-((uintptr_t)real)%alignment) );
+                    data = (T*)( ( uintptr_t(real) + uintptr_t(alignment-1)) / alignment * alignment);
+                    inUse = true;
+                }
+                else {
+                    allocatedSize = 0;
+                    data = NULL;
+                    inUse = false;
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    void swap(AlignedBuffer<T> &other) {
+        void *tmpReal = other.real;
+        other.real = real;
+        real = tmpReal;
+
+        char tmpAlignt = other.alignment;
+        other.alignment = alignment;
+        alignment = tmpAlignt;
+
+        size_t tmpAllocSize = other.allocatedSize;
+        other.allocatedSize = allocatedSize;
+        allocatedSize = tmpAllocSize;
+
+        T* tmpData = other.data;
+        other.data = data;
+        data = tmpData;
+
+        bool tmpInUse = other.inUse;
+        other.inUse = inUse;
+        inUse = tmpInUse;
+    }
+};
+
+// Multi processor version, use with OpenMP
+template <class T> class AlignedBufferMP {
+private:
+    MyMutex mtx;
+    std::vector<AlignedBuffer<T>*> buffers;
+    size_t size;
+
+public:
+    AlignedBufferMP(size_t sizeP) {
+        size=sizeP;
+    }
+
+    ~AlignedBufferMP() {
+        for (int i=0;i<buffers.size();i++) delete buffers[i];
+    }
+
+    AlignedBuffer<T>* acquire() {
+        MyMutex::MyLock lock(mtx);
+
+        // Find available buffer
+        for (int i;i<buffers.size();i++) {
+            if (!buffers[i]->inUse) {
+                buffers[i]->inUse=true;
+                return buffers[i];
+            }
+        }
+
+        // Add new buffer if nothing is free
+        AlignedBuffer<T>* buffer=new AlignedBuffer<T>(size);
+        buffers.push_back(buffer);
+
+        return buffer;
+    }
+
+    void release(AlignedBuffer<T>* buffer) {
+    	MyMutex::MyLock lock(mtx);
+
+        buffer->inUse=false;
+    }
+};
+#endif