Creating .bmp image files to test algorithm.

mlaa.cpp

@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <iostream>
+#include <stdlib.h>
+
+void writeImg(int *pix, int w, int h) {
+
+    int filesize = 54 + 3*w*h;
+    unsigned char *img = new unsigned char[3*w*h];
+    int ind = 0;
+
+    for (int i=0; i<w; i++) {
+        for (int j=0; j<h; j++) {
+            ind = i + ((h-1)-j)*w;
+            img[ind*3+2] = (unsigned char)(pix[ind]); // r
+            img[ind*3+1] = (unsigned char)(pix[ind]); // g
+            img[ind*3+0] = (unsigned char)(pix[ind]); // b
+        }
+    }
+
+    // Magic header mumbo-jumbo
+    unsigned char bmpfileheader[14] = {'B','M',0,0,0,0,0,0,0,0,54,0,0,0};
+    unsigned char bmpinfoheader[40] = {40,0,0,0,0,0,0,0,0,0,0,0,1,0,24,0};
+    unsigned char bmppad[3] = {0,0,0};
+
+    bmpfileheader[ 2] = (unsigned char)(filesize    );
+    bmpfileheader[ 3] = (unsigned char)(filesize>> 8);
+    bmpfileheader[ 4] = (unsigned char)(filesize>>16);
+    bmpfileheader[ 5] = (unsigned char)(filesize>>24);
+
+    bmpinfoheader[ 4] = (unsigned char)(       w    );
+    bmpinfoheader[ 5] = (unsigned char)(       w>> 8);
+    bmpinfoheader[ 6] = (unsigned char)(       w>>16);
+    bmpinfoheader[ 7] = (unsigned char)(       w>>24);
+    bmpinfoheader[ 8] = (unsigned char)(       h    );
+    bmpinfoheader[ 9] = (unsigned char)(       h>> 8);
+    bmpinfoheader[10] = (unsigned char)(       h>>16);
+    bmpinfoheader[11] = (unsigned char)(       h>>24);
+
+    FILE *f;
+
+    f = fopen("img.bmp","wb");
+    fwrite(bmpfileheader,1,14,f);
+    fwrite(bmpinfoheader,1,40,f);
+    for (int i=0; i<h; i++) {
+        fwrite(img+(w*(h-i-1)*3),3,w,f);
+        fwrite(bmppad,1,(4-(w*3)%4)%4,f);
+    }
+
+    free(img);
+    fclose(f);
+}
+
+int main (int argc, char *argv[]) {
+
+    int w = 500;
+    int h = 300;
+    int ind = 0;
+
+    int *pix = new int[w*h];
+
+    // Create an image with some features
+    for (int i=0; i<w; i++) {
+        for (int j=0; j<h; j++) {
+            ind = i + ((h-1)-j)*w;
+            pix[ind] = 255; // Make sure we fill a color;
+            if (    i       < w/4) pix[ind] = 127;
+            if (j           < h/4) pix[ind] =  63;
+            if (j  +i - h/4 < h  ) pix[ind] =  31;
+            if (j-2*i + 4*h < w  ) pix[ind] =   0;
+        }
+    }
+
+    writeImg(pix,w,h);
+
+    return 0;
+}