Initial commit.

Framework/external/embree/tutorials/common/image/exr.cpp

@@ -0,0 +1,70 @@
+// Copyright 2009-2021 Intel Corporation
+// SPDX-License-Identifier: Apache-2.0
+
+#include "image.h"
+
+#include <iostream>
+#include <cstring>
+#include <cstdio>
+
+#define TINYEXR_USE_MINIZ 0
+//#include "zlib.h"
+//Or, if your project uses `stb_image[_write].h`, use their
+//zlib implementation:
+#define TINYEXR_USE_STB_ZLIB 1
+#define TINYEXR_IMPLEMENTATION
+#include "tinyexr.h"
+
+namespace embree
+{
+  /*! read PFM file from disk */
+  Ref<Image> loadEXR(const FileName& fileName)
+  {
+    float* rgba; // width * height * RGBA
+    int width;
+    int height;
+    const char* err = NULL; // or nullptr in C++11
+
+    int ret = LoadEXR(&rgba, &width, &height, fileName.str().c_str(), &err);
+    if (ret != TINYEXR_SUCCESS) {
+      if (err) {
+        std::cerr << "ERR: " << err;
+        FreeEXRErrorMessage(err);
+      }
+      THROW_RUNTIME_ERROR("Could not load image " + fileName.str())
+    }
+
+    /* create image and fill with data */
+    Ref<Image> img = new Image4f(width,height,fileName);
+
+    for (ssize_t y=0; y<height; y++) {
+      for (ssize_t x=0; x<width; x++) {
+        float* pix = rgba + (y * width + x) * 4;
+        img->set(x,y,Color4(pix[0],pix[1],pix[2],1.0f));
+      }
+    }
+    free(rgba);
+    return img;
+  }
+
+  /*! store PFM file to disk */
+  void storeEXR(const Ref<Image>& img, const FileName& fileName)
+  {
+    std::vector<Col3f> rgb(img->width * img->height);
+    for (size_t y=0; y<img->height; ++y) {
+        for (size_t x=0; x<img->width; ++x) {
+            Color4 c = img->get(x, y);
+            rgb[y * img->width + x] = Col3f(c.r, c.g, c.b);
+        }
+    }
+    const char* err = NULL;
+    int ret = SaveEXR((float*)rgb.data(), img->width, img->height, 3, 0, fileName.str().c_str(), &err);
+    if (ret != TINYEXR_SUCCESS) {
+      if (err) {
+        std::cerr << "ERR: " << err;
+        FreeEXRErrorMessage(err);
+      }
+      THROW_RUNTIME_ERROR("Could not save image " + fileName.str())
+    }
+  }
+}