utility to extract C from font image

extractglyphs.cpp

@@ -0,0 +1,66 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#include <unistd.h>
+#include <cmath>
+
+#include <FreeImagePlus.h>
+
+using namespace std;
+
+// image_out and image_in have identical dimensions
+void extract_glyph(fipImage &image_in, int g, unsigned char glyph[8])
+{
+    int glyphs_across = image_in.getWidth() / 7;
+    int x = (g % glyphs_across) * 7;
+    int y = (g / glyphs_across) * 8; // XXX why invert in Y?
+    for(int j = 0; j < 8; j++) {
+        unsigned char byte = 0;
+        for(int i = 0; i < 7; i++) {
+            RGBQUAD result;
+            image_in.getPixelColor(x + i, image_in.getHeight() - 1 - (y + j), &result);
+            int pixel = (result.rgbRed > 127) ? 1 : 0;
+            byte = byte | (pixel << i);
+        }
+        glyph[j] = byte;
+    }
+}
+
+int main(int argc, char **argv)
+{
+    if(argc != 2) {
+	printf("usage: %s input\n", argv[0]);
+	exit(EXIT_FAILURE);
+    }
+
+    fipImage image_in;
+    bool success;
+
+    if (!(success = image_in.load(argv[1]))) {
+        cerr << "Failed to load image from " << argv[1] << endl;
+        exit(EXIT_FAILURE);
+    }
+
+    printf("int font_offset = 32;\n");
+    printf("unsigned char font_bytes[][8] = {\n");
+
+    static unsigned char font[96][8];
+    for(int i = 0; i <= 95; i++) {
+        extract_glyph(image_in, i, font[i]);
+        printf("    {");
+
+        for(int j = 0; j < 8; j++)
+            printf("0x%02X%s", font[i][j], (j < 7) ? ", " : "");
+
+        if(i < 95)
+            printf("},\n");
+        else
+            printf("}\n");
+    }
+
+    printf("};\n");
+
+    exit(EXIT_SUCCESS);
+}
+