First attempt to read images

imanox-chroma-matting/main.cpp

@@ -1,9 +1,70 @@
 #include <iostream>
+#include <jpeglib.h>
 
 using namespace std;
 
 int main()
 {
+    loadJpg("..\img\foregrounds\1.jpg")
     cout << "Hello world!" << endl;
     return 0;
 }
+
+int loadJpg(const char* Name) {
+  unsigned char a, r, g, b;
+  int width, height;
+  struct jpeg_decompress_struct cinfo;
+  struct jpeg_error_mgr jerr;
+
+  FILE * infile;        /* source file */
+  JSAMPARRAY pJpegBuffer;       /* Output row buffer */
+  int row_stride;       /* physical row width in output buffer */
+  if ((infile = fopen(Name, "rb")) == NULL) {
+    fprintf(stderr, "can't open %s\n", Name);
+    return 0;
+  }
+  cinfo.err = jpeg_std_error(&jerr);
+  jpeg_create_decompress(&cinfo);
+  jpeg_stdio_src(&cinfo, infile);
+  (void) jpeg_read_header(&cinfo, TRUE);
+  (void) jpeg_start_decompress(&cinfo);
+  width = cinfo.output_width;
+  height = cinfo.output_height;
+
+  unsigned char * pDummy = new unsigned char [width*height*4];
+  unsigned char * pTest = pDummy;
+  if (!pDummy) {
+    printf("NO MEM FOR JPEG CONVERT!\n");
+    return 0;
+  }
+  row_stride = width * cinfo.output_components;
+  pJpegBuffer = (*cinfo.mem->alloc_sarray)
+    ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+
+  while (cinfo.output_scanline < cinfo.output_height) {
+    (void) jpeg_read_scanlines(&cinfo, pJpegBuffer, 1);
+    for (int x = 0; x < width; x++) {
+      a = 0; // alpha value is not supported on jpg
+      r = pJpegBuffer[0][cinfo.output_components * x];
+      if (cinfo.output_components > 2) {
+        g = pJpegBuffer[0][cinfo.output_components * x + 1];
+        b = pJpegBuffer[0][cinfo.output_components * x + 2];
+      } else {
+        g = r;
+        b = r;
+      }
+      *(pDummy++) = b;
+      *(pDummy++) = g;
+      *(pDummy++) = r;
+      *(pDummy++) = a;
+    }
+  }
+  fclose(infile);
+  (void) jpeg_finish_decompress(&cinfo);
+  jpeg_destroy_decompress(&cinfo);
+
+  BMap = (int*)pTest;
+  Height = height;
+  Width = width;
+  Depth = 32;
+}