pke: glyph word-wrap on whitespace

1 files changed, 25 insertions, 1 deletions

diff --git a/src/font.cpp b/src/font.cpp
index e905da3..6357a1d 100644
--- a/src/font.cpp
+++ b/src/font.cpp
@@ -89,12 +89,27 @@ uint32_t utf8_to_unicode(const char* str, uint32_t &out) {
 	return i;
 }
 
+float FontType_Inner_LookAheadWordLength(const FontType *const ft, const FontRender *const fr, uint32_t index, float font_glyph_spacing) {
+	uint32_t i;
+	float ret = 0;
+	FontGlyphChar *fgc;
+	for (i = index; i < fr->n_glyphs; ++i) {
+		fgc = &ft->glyphs[fr->glyph_indices[i]];
+		if (fgc->is_whitespace == true) {
+			break;
+		}
+		ret += fgc->advance * font_glyph_spacing;
+	}
+	return ret;
+}
+
 void FontType_Inner_CalcTransforms(const FontType *ft, FontRender *fr, FontInstanceBufferItem *ptr_dst) {
 	assert(ft != nullptr);
 	assert(fr != nullptr);
 	assert(ptr_dst != nullptr);
 	FontGlyphChar *fgc;
 	FontInstanceBufferItem *buf_item;
+	bool new_word = true;
 	uint32_t i;
 	float font_glyph_spacing;
 	float cursor_head, line_index, line_height;
@@ -119,8 +134,17 @@ void FontType_Inner_CalcTransforms(const FontType *ft, FontRender *fr, FontInsta
 
 		if (fgc->is_whitespace == true) {
 			cursor_head += fgc->advance * font_glyph_spacing;
+			new_word = true;
 			continue;
 		}
+		if (new_word == true) {
+			float word_width = FontType_Inner_LookAheadWordLength(ft, fr, i, font_glyph_spacing);
+			if (cursor_head + word_width > fr->settings.surface_area_size.x) {
+				line_index += 1;
+				cursor_head = 0;
+			}
+			new_word = false;
+		}
 
 		// left, bottom, right, top
 		//    x,      y,     z,   w
@@ -151,7 +175,7 @@ void FontType_Inner_CalcTransforms(const FontType *ft, FontRender *fr, FontInsta
 		// box position
 		translate.y = fr->settings.surface_area_pos.y;
 		// baseline - current line (+1 to not draw above the box)
-		translate.y -= ((line_index + 1) * line_height);
+		translate.y += ((line_index + 1) * line_height);
 		// places the top line of the glyph on the baseline
 		translate.y += (font_glyph_spacing / 2.0) + (glyph_size.y / 2.0);
 		// move glyph to the height relative to the baseline (cursor)