Support demosaiced floating point DNGs with LibRaw

rtengine/rawimage.cc

@@ -465,6 +465,7 @@ int RawImage::loadRaw(bool loadData, unsigned int imageNum, bool closeFile, Prog
 {
     ifname = filename.c_str();
     image = nullptr;
+    image_from_float.reset();
     verbose = settings->verbose;
     oprof = nullptr;
 
@@ -531,7 +532,7 @@ int RawImage::loadRaw(bool loadData, unsigned int imageNum, bool closeFile, Prog
         } else if (err != LIBRAW_SUCCESS) {
             decoder = Decoder::LIBRAW;
             return err;
-        } else if (libraw->is_floating_point() && libraw->imgdata.idata.dng_version) {
+        } else if (libraw->is_floating_point() && libraw->imgdata.idata.dng_version && libraw->imgdata.idata.filters) {
             return err;
         }
 
@@ -785,6 +786,7 @@ int RawImage::loadRaw(bool loadData, unsigned int imageNum, bool closeFile, Prog
             (this->*load_raw)();
         } else if (decoder == Decoder::LIBRAW) {
             libraw->imgdata.rawparams.shot_select = shot_select;
+            libraw->imgdata.rawparams.options &= ~LIBRAW_RAWOPTIONS_CONVERTFLOAT_TO_INT;
 
             int err = libraw->open_buffer(ifp->data, ifp->size);
             if (err) {
@@ -810,6 +812,24 @@ int RawImage::loadRaw(bool loadData, unsigned int imageNum, bool closeFile, Prog
                         float_raw_image[idx] = rd.float_image[idx];
                     }
                 }
+            } else if (rd.float3_image) {
+                const auto image_size = static_cast<unsigned int>(height) * static_cast<unsigned int>(width);
+                try {
+                    image_from_float.reset(new std::remove_pointer<dcrawImage_t>::type[image_size]);
+                } catch (const std::bad_alloc &e) {
+                    return 200;
+                }
+                std::fill(&image_from_float[0][0], &image_from_float[0][0] + image_size, 0);
+
+                float_raw_image = new float[3 * raw_width * raw_height];
+                for (int y = 0; y < raw_height; ++y) {
+                    for (int x = 0; x < raw_width; ++x) {
+                        const size_t idx = y * raw_width + x;
+                        for (int c = 0; c < 3; ++c) {
+                            float_raw_image[3 * idx + c] = rd.float3_image[idx][c];
+                        }
+                    }
+                }
             } else {
 #ifdef LIBRAW_USE_OPENMP
                 MyMutex::MyLock lock(*librawMutex);
@@ -1101,9 +1121,14 @@ int RawImage::loadRaw(bool loadData, unsigned int imageNum, bool closeFile, Prog
     return 0;
 }
 
+DCraw::dcrawImage_t RawImage::get_image()
+{
+    return image ? image : image_from_float.get();
+}
+
 float** RawImage::compress_image(unsigned int frameNum, bool freeImage)
 {
-    if (!image) {
+    if (!image && !image_from_float) {
         return nullptr;
     }
 
@@ -1139,7 +1164,7 @@ float** RawImage::compress_image(unsigned int frameNum, bool freeImage)
     }
 
     // copy pixel raw data: the compressed format earns space
-    if (float_raw_image) {
+    if (float_raw_image && filters) {
 #ifdef _OPENMP
         #pragma omp parallel for
 #endif
@@ -1149,6 +1174,20 @@ float** RawImage::compress_image(unsigned int frameNum, bool freeImage)
                 this->data[row][col] = float_raw_image[(row + top_margin) * raw_width + col + left_margin];
             }
 
+        delete [] float_raw_image;
+        float_raw_image = nullptr;
+    } else if (float_raw_image) {
+#ifdef _OPENMP
+        #pragma omp parallel for
+#endif
+
+        for (int row = 0; row < height; row++)
+            for (int col = 0; col < width; col++) {
+                for (int c = 0; c < 3; ++c) {
+                    this->data[row][3 * col + c] = float_raw_image[3 * ((row + top_margin) * raw_width + col + left_margin) + c];
+                }
+            }
+
         delete [] float_raw_image;
         float_raw_image = nullptr;
     } else if (merged_pixelshift.is_merged_pixelshift) {
@@ -1240,6 +1279,7 @@ float** RawImage::compress_image(unsigned int frameNum, bool freeImage)
             libraw->recycle();
         }
         image = nullptr;
+        image_from_float.reset();
     }
 
     return data;

rtengine/rawimage.h

@@ -54,10 +54,7 @@ public:
             filters &= ~((filters & 0x55555555) << 1);
         }
     }
-    dcrawImage_t get_image()
-    {
-        return image;
-    }
+    dcrawImage_t get_image();
     float** compress_image(unsigned int frameNum, bool freeImage = true); // revert to compressed pixels format and release image data
     float** data;             // holds pixel values, data[i][j] corresponds to the ith row and jth column
     unsigned prefilters;               // original filters saved ( used for 4 color processing )
@@ -78,6 +75,7 @@ protected:
     int maximum_c4[4];
     Decoder decoder{Decoder::DCRAW};
     std::unique_ptr<LibRaw> libraw;
+    std::unique_ptr<std::remove_pointer<dcrawImage_t>::type[]> image_from_float;
     bool isFoveon() const
     {
         return is_foveon;

rtengine/rtthumbnail.cc

@@ -237,13 +237,14 @@ void scale_colors (rtengine::RawImage *ri, float scale_mul[4], float cblack[4],
             }
         }
     } else if (isFloat) {
+        const auto colors = ri->get_colors();
 #ifdef _OPENMP
         #pragma omp parallel for if(multiThread)
 #endif
         for (int row = 0; row < height; ++row) {
             for (int col = 0; col < width; ++col) {
-                for (int i = 0; i < ri->get_colors(); ++i) {
-                    float val = float_raw_image[(row + top_margin) * raw_width + col + left_margin + i];
+                for (int i = 0; i < colors; ++i) {
+                    float val = float_raw_image[colors * ((row + top_margin) * raw_width + col + left_margin) + i];
                     val -= cblack[i];
                     val *= scale_mul[i];
                     image[row * width + col][i] = val;