fix: update sbdf file

1 files changed, 44 insertions, 10 deletions

diff --git a/src/sbdf.h b/src/sbdf.h
index ba6d413..f812208 100644
--- a/src/sbdf.h
+++ b/src/sbdf.h
@@ -1,6 +1,6 @@
 /*
   BDF simple reader and printer (ASCII Support only)
-  include stdio.h stddef.h stdlib.h string.h
+  include stdio.h stdlib.h string.h
   Should define SBDF_IMPLEMENTATION in only one .c file
 */
 
@@ -8,6 +8,7 @@ typedef struct SBDF_Font SBDF_Font;
 
 SBDF_Font*   SBDF_FontLoad(const char *);
 void         SBDF_FontDestroy(SBDF_Font *);
+void         SBDF_GetSize(const SBDF_Font *, const char *, int *, int *, int *, int *);
 #ifdef SBDF_USESDL
 void         SBDF_SDLPrint(const SDL_Renderer *, const SBDF_Font *, const char *, int, int);
 #endif
@@ -24,7 +25,7 @@ struct SBDF_Font {
 	unsigned char *data;
 };
 
-struct SBDF_Font*
+static struct SBDF_Font*
 SBDF_FontInit(size_t sz) {
 	struct SBDF_Font *res;
 	int i;
@@ -36,8 +37,15 @@ SBDF_FontInit(size_t sz) {
 		free(res);
 		return NULL;
 	}
-	for (i = 0; i < 256; i++)
+	for (i = 0; i < 256; i++) {
+		res->g[i].dx = 0;
+		res->g[i].dy = 0;
+		res->g[i].bx = 0;
+		res->g[i].by = 0;
+		res->g[i].bw = 0;
+		res->g[i].bh = 0;
 		res->g[i].s = -1;
+	}
 	return res;
 }
 
@@ -187,6 +195,32 @@ SBDF_FontLoad_defer:
 	return NULL;
 }
 
+void
+SBDF_GetSize(const struct SBDF_Font *f, const char *text, int *tx, int *ty, int *w, int *h) {
+	char *u;
+	int minw, minh, maxw, maxh, x, y;
+	x = y = minw = minh = maxw = maxh = 0;
+
+	u = text;
+	while (*u != '\0') {
+		x += f->g[(unsigned char)*u].bx;
+		y += f->g[(unsigned char)*u].by;
+		minw = (minw < x) ? minw : x;
+		minh = (minh < y) ? minh : y;
+		maxw = (maxw > x + f->g[(unsigned char)*u].bw) ? maxw : (x + f->g[(unsigned char)*u].bw);
+		maxh = (maxh > y + f->g[(unsigned char)*u].bh) ? maxh : (y + f->g[(unsigned char)*u].bh);
+
+		x += f->g[(unsigned char)*u].dx - f->g[(unsigned char)*u].bx;
+		y += f->g[(unsigned char)*u].dy - f->g[(unsigned char)*u].by;
+		u++;
+	}
+
+	if (tx != NULL) *tx = minw;
+	if (ty != NULL) *ty = minh;
+	if (w  != NULL) *w = maxw;
+	if (h  != NULL) *h = maxh;
+}
+
 #ifdef SBDF_USESDL
 void
 SBDF_SDLPrint(const SDL_Renderer *r, const struct SBDF_Font *f, const char *text, int x, int y) {
@@ -195,18 +229,18 @@ SBDF_SDLPrint(const SDL_Renderer *r, const struct SBDF_Font *f, const char *text
 	int i, j;
 	u = text;
 	while (*u != '\0') {
-		v = &f->data[f->g[*u].s];
-		x += f->g[*u].bx;
-		y += f->g[*u].by;
-		for (i = 0; i < f->g[*u].bh; i++) {
-			for (j = 0; j < f->g[*u].bw; j++) {
+		v = &f->data[f->g[(unsigned char)*u].s];
+		x += f->g[(unsigned char)*u].bx;
+		y -= f->g[(unsigned char)*u].by + f->g[(unsigned char)*u].bh;
+		for (i = 0; i < f->g[(unsigned char)*u].bh; i++) {
+			for (j = 0; j < f->g[(unsigned char)*u].bw; j++) {
 				if (v[j/8]>>(7-(j%8))&1)
 					SDL_RenderDrawPoint(r, x+j, y+i);
 			}
 			v += (j + 7) / 8;
 		}
-		x += f->g[*u].dx - f->g[*u].bx;
-		y += f->g[*u].dy - f->g[*u].by;
+		x += f->g[(unsigned char)*u].dx - f->g[(unsigned char)*u].bx;
+		y += f->g[(unsigned char)*u].dy + f->g[(unsigned char)*u].by + f->g[(unsigned char)*u].bh;
 		u++;
 	}
 }