Add resizable debug text with ctrl plus and minus

1 files changed, 25 insertions, 0 deletions

diff --git a/kon/konfont.h b/kon/konfont.h
index 822e1f3..a75c502 100644
--- a/kon/konfont.h
+++ b/kon/konfont.h
@@ -45,6 +45,10 @@ void kon_freeFont(kon_font_t *font);
 
 kon_image *kon_fontGetAtlas(kon_font_t *font);
 
+/* the ttf data has to stay alive for as long as the font, resizing bakes from it again */
+float kon_fontPixelHeight(const kon_font_t *font);
+int kon_fontResize(kon_font_t *font, float pixelHeight);
+
 /*** text draw declarations ***/
 
 void kon_drawText(kon_framebuffer_t *fb, kon_font_t *font, int x, int y, const char *text, uint32_t color);
@@ -57,6 +61,7 @@ void kon_measureText(kon_font_t *font, const char *text, int *outWidth, int *out
 #include "stb_truetype.h"
 
 struct kon_font {
+	const uint8_t *ttf;
 	stbtt_bakedchar chardata[KON_FONT_NUM_CHARS];
 	uint8_t *atlasPixels;
 	int atlasSize;
@@ -98,6 +103,7 @@ kon_font_t *kon_loadFont(const uint8_t *ttf_data, size_t size, float pixelHeight
 	kon_font_t *font = malloc(sizeof(kon_font_t));
 	if (!font) return NULL;
 
+	font->ttf = ttf_data;
 	font->atlasPixels = NULL;
 	font->pixelHeight = pixelHeight;
 
@@ -116,6 +122,25 @@ void kon_freeFont(kon_font_t *font) {
 	free(font);
 }
 
+float kon_fontPixelHeight(const kon_font_t *font) {
+	return font ? font->pixelHeight : 0.0f;
+}
+
+int kon_fontResize(kon_font_t *font, float pixelHeight) {
+	kon_font_t next;
+
+	if (!font || pixelHeight <= 0.0f) return 0;
+
+	next = *font;
+	next.atlasPixels = NULL;
+	if (!kon_fontBakeAtlas(&next, font->ttf, pixelHeight)) return 0;
+
+	free(font->atlasPixels);
+	next.pixelHeight = pixelHeight;
+	*font = next;
+	return 1;
+}
+
 kon_image *kon_fontGetAtlas(kon_font_t *font) {
 	if (!font) return NULL;