Initial commit.

Makefile

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+all:
+	g++ -o test_tinyexr tinyexr.cc test.cc

README.md

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+# Tiny OpenEXR image loader.
+
+![Example](https://github.com/syoyo/tinyexr/blob/master/asakusa.png?raw=true)
+
+`tinyexr` is a small library to load OpenEXR(.exr) image.
+TO use `tinyexr`, simply copy `tinyexr.cc` and `tinyexr.h` into your project.
+
+`tinyexr` currently supports:
+
+* OpenEXR version 1.x.
+* RGB(A) channel.
+* Scanline format.
+* ZIP compression.
+* Half pixel type.
+* Litte endian machine.
+
+## TODO
+
+* Tile format.
+* Support for various compression type.
+* Multi-channel.
+* Pixel order.
+* EXR 2.0(deep image).
+* Big endian machine.
+
+## License
+
+3-clause BSD
+
+`tinyexr` uses miniz, which is developed by Rich Geldreich <[email protected]>, and licensed under public domain.
+
+## Author(s)
+
+Syoyo Fujita([email protected])

test.cc

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+#include <cstdlib>
+#include <cstdio>
+#include <vector>
+
+#include "tinyexr.h"
+
+void
+SaveAsPFM(const char* filename, int width, int height, float* data)
+{
+  FILE* fp = fopen(filename, "wb");
+  if (!fp) {
+    fprintf(stderr, "failed to write a PFM file.\n");
+    return;
+  }
+
+  fprintf(fp, "PF\n");
+  fprintf(fp, "%d %d\n", width, height);
+  fprintf(fp, "-1\n"); // -1: little endian, 1: big endian
+
+  // RGBA -> RGB
+  std::vector<float> rgb(width*height*3);
+
+  for (size_t i = 0; i < width * height; i++) {
+    rgb[3*i+0] = data[4*i+0];
+    rgb[3*i+1] = data[4*i+1];
+    rgb[3*i+2] = data[4*i+2];
+  }
+
+  fwrite(&rgb.at(0), sizeof(float), width * height * 3, fp);
+
+  fclose(fp);
+}
+
+int
+main(int argc, char** argv)
+{
+  float* out;
+  int width;
+  int height;
+  const char* err;
+
+  if (argc < 2) {
+    fprintf(stderr, "Needs input.exr.\n");
+    exit(-1);
+  }
+
+  int ret = LoadEXR(&out, &width, &height, argv[1], &err);
+  if (ret != 0) {
+    fprintf(stderr, "Load EXR err.\n");
+    return ret;
+  }
+
+  printf("EXR: %d x %d\n", width, height);
+
+  SaveAsPFM("output.pfm", width, height, out);
+
+  printf("Saved pfm file.\n");
+
+  free(out);
+
+  return ret;
+}

tinyexr.h

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+#ifndef __TINYEXR_H__
+#define __TINYEXR_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Application must free image data as returned by `out_rgba`
+// Result image format is: float x RGBA x width x hight
+// returns error string in `err` when there's an error
+extern int LoadEXR(float** out_rgba, int* width, int* height, const char* filename, const char** err);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __TINYEXR_H__