cleanup and refactoring

raytracer/nvpro_core/fileformats/bmp.hpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2019-2021, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2019-2021 NVIDIA CORPORATION
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/// @DOC_SKIP (keyword to exclude this file from automatic README.md generation)
+
+#pragma once
+
+#include <stdio.h>
+
+inline void saveBMP(const char* bmpfilename, int width, int height, const unsigned char* bgra)
+{
+#pragma pack(push, 1)
+  struct
+  {
+    unsigned short bfType;
+    unsigned int   bfSize;
+    unsigned int   bfReserved;
+    unsigned int   bfOffBits;
+
+    unsigned int   biSize;
+    signed int     biWidth;
+    signed int     biHeight;
+    unsigned short biPlanes;
+    unsigned short biBitCount;
+    unsigned int   biCompression;
+    unsigned int   biSizeImage;
+    signed int     biXPelsPerMeter;
+    signed int     biYPelsPerMeter;
+    unsigned int   biClrUsed;
+    unsigned int   biClrImportant;
+  } bmpinfo;
+#pragma pack(pop)
+
+  const unsigned int imageDataSize = width * height * 4 * static_cast<unsigned int>(sizeof(unsigned char));
+
+  bmpinfo.bfType     = 19778;
+  bmpinfo.bfSize     = static_cast<unsigned int>(sizeof(bmpinfo)) + imageDataSize;
+  bmpinfo.bfReserved = 0;
+  bmpinfo.bfOffBits  = 54;
+
+  bmpinfo.biSize          = 40;
+  bmpinfo.biWidth         = width;
+  bmpinfo.biHeight        = height;
+  bmpinfo.biPlanes        = 1;
+  bmpinfo.biBitCount      = 32;
+  bmpinfo.biCompression   = 0;
+  bmpinfo.biSizeImage     = 0;
+  bmpinfo.biXPelsPerMeter = 0;
+  bmpinfo.biYPelsPerMeter = 0;
+  bmpinfo.biClrUsed       = 0;
+  bmpinfo.biClrImportant  = 0;
+
+  FILE* bmpfile = fopen(bmpfilename, "wb");
+  fwrite(&bmpinfo, sizeof(bmpinfo), 1, bmpfile);
+  fwrite(bgra, sizeof(char), imageDataSize, bmpfile);
+  fclose(bmpfile);
+}