--- /dev/null
+// This program was used to encode the data for stb_simple_font.h
+
+#define STB_DEFINE
+#include "stb.h"
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+int w,h;
+uint8 *data;
+
+int last_x[2], last_y[2];
+int num_seg[2], non_empty;
+#if 0
+typedef struct
+{
+ unsigned short first_segment;
+ unsigned char advance;
+} chardata;
+
+typedef struct
+{
+ unsigned char x:4;
+ unsigned char y:4;
+ unsigned char len:3;
+ unsigned char dir:1;
+} segment;
+
+segment *segments;
+
+void add_seg(int x, int y, int len, int horizontal)
+{
+ segment s;
+ s.x = x;
+ s.y = y;
+ s.len = len;
+ s.dir = horizontal;
+ assert(s.x == x);
+ assert(s.y == y);
+ assert(s.len == len);
+ stb_arr_push(segments, s);
+}
+#else
+typedef struct
+{
+ unsigned char first_segment:8;
+ unsigned char first_v_segment:8;
+ unsigned char advance:5;
+ unsigned char voff:1;
+} chardata;
+
+#define X_LIMIT 1
+#define LEN_LIMIT 7
+
+typedef struct
+{
+ unsigned char dx:1;
+ unsigned char y:4;
+ unsigned char len:3;
+} segment;
+
+segment *segments;
+segment *vsegments;
+
+void add_seg(int x, int y, int len, int horizontal)
+{
+ segment s;
+
+ while (x - last_x[horizontal] > X_LIMIT) {
+ add_seg(last_x[horizontal] + X_LIMIT, 0, 0, horizontal);
+ }
+ while (len > LEN_LIMIT) {
+ add_seg(x, y, LEN_LIMIT, horizontal);
+ len -= LEN_LIMIT;
+ x += LEN_LIMIT*horizontal;
+ y += LEN_LIMIT*!horizontal;
+ }
+
+ s.dx = x - last_x[horizontal];
+ s.y = y;
+ s.len = len;
+ non_empty += len != 0;
+ //assert(s.x == x);
+ assert(s.y == y);
+ assert(s.len == len);
+ ++num_seg[horizontal];
+ if (horizontal)
+ stb_arr_push(segments, s);
+ else
+ stb_arr_push(vsegments, s);
+ last_x[horizontal] = x;
+}
+
+void print_segments(segment *s)
+{
+ int i, hpos;
+ printf(" ");
+ hpos = 4;
+ for (i=0; i < stb_arr_len(s); ++i) {
+ // repack for portability
+ unsigned char seg = s[i].len + s[i].dx*8 + s[i].y*16;
+ hpos += printf("%d,", seg);
+ if (hpos > 72 && i+1 < stb_arr_len(s)) {
+ hpos = 4;
+ printf("\n ");
+ }
+ }
+ printf("\n");
+}
+
+#endif
+
+chardata charinfo[128];
+
+int parse_char(int x, chardata *c, int offset)
+{
+ int start_x = x, end_x, top_y = 0, y;
+
+ c->first_segment = stb_arr_len(segments);
+ c->first_v_segment = stb_arr_len(vsegments) - offset;
+ assert(c->first_segment == stb_arr_len(segments));
+ assert(c->first_v_segment + offset == stb_arr_len(vsegments));
+
+ // find advance distance
+ end_x = x+1;
+ while (data[end_x*3] == 255)
+ ++end_x;
+ c->advance = end_x - start_x + 1;
+
+ last_x[0] = last_x[1] = 0;
+ last_y[0] = last_y[1] = 0;
+
+ for (y=2; y < h; ++y) {
+ for (x=start_x; x < end_x; ++x) {
+ if (data[y*3*w+x*3+1] < 255) {
+ top_y = y;
+ break;
+ }
+ }
+ if (top_y)
+ break;
+ }
+ c->voff = top_y > 2;
+ if (top_y > 2)
+ top_y = 3;
+
+ for (x=start_x; x < end_x; ++x) {
+ int y;
+ for (y=2; y < h; ++y) {
+ if (data[y*3*w+x*3+1] < 255) {
+ if (data[y*3*w+x*3+0] == 255) { // red
+ int len=0;
+ while (y+len < h && data[(y+len)*3*w+x*3+0] == 255 && data[(y+len)*3*w+x*3+1] == 0) {
+ data[(y+len)*3*w+x*3+0] = 0;
+ ++len;
+ }
+ add_seg(x-start_x,y-top_y,len,0);
+ }
+ if (data[y*3*w+x*3+2] == 255) { // blue
+ int len=0;
+ while (x+len < end_x && data[y*3*w+(x+len)*3+2] == 255 && data[y*3*w+(x+len)*3+1] == 0) {
+ data[y*3*w+(x+len)*3+2] = 0;
+ ++len;
+ }
+ add_seg(x-start_x,y-top_y,len,1);
+ }
+ }
+ }
+ }
+ return end_x;
+}
+
+
+int main(int argc, char **argv)
+{
+ int c, x=0;
+ data = stbi_load("easy_font_raw.png", &w, &h, 0, 3);
+ for (c=32; c < 127; ++c) {
+ x = parse_char(x, &charinfo[c], 0);
+ printf("%3d -- %3d %3d\n", c, charinfo[c].first_segment, charinfo[c].first_v_segment);
+ }
+ printf("===\n");
+ printf("%d %d %d\n", num_seg[0], num_seg[1], non_empty);
+ printf("%d\n", sizeof(segments[0]) * stb_arr_len(segments));
+ printf("%d\n", sizeof(segments[0]) * stb_arr_len(segments) + sizeof(segments[0]) * stb_arr_len(vsegments) + sizeof(charinfo[32])*95);
+
+ printf("struct {\n"
+ " unsigned char advance;\n"
+ " unsigned char h_seg;\n"
+ " unsigned char v_seg;\n"
+ "} stb_easy_font_charinfo[96] = {\n");
+ charinfo[c].first_segment = stb_arr_len(segments);
+ charinfo[c].first_v_segment = stb_arr_len(vsegments);
+ for (c=32; c < 128; ++c) {
+ if ((c & 3) == 0) printf(" ");
+ printf("{ %2d,%3d,%3d },",
+ charinfo[c].advance + 16*charinfo[c].voff,
+ charinfo[c].first_segment,
+ charinfo[c].first_v_segment);
+ if ((c & 3) == 3) printf("\n"); else printf(" ");
+ }
+ printf("};\n\n");
+
+ printf("unsigned char stb_easy_font_hseg[%d] = {\n", stb_arr_len(segments));
+ print_segments(segments);
+ printf("};\n\n");
+
+ printf("unsigned char stb_easy_font_vseg[%d] = {\n", stb_arr_len(vsegments));
+ print_segments(vsegments);
+ printf("};\n");
+ return 0;
+}