freetype: text_size() so that users can retrieve the vertical size of a text too

vlib/freetype/freetype.v

@@ -46,10 +46,16 @@ pub const (
 )
 
 struct Character {
+	code i64
+	
 	texture_id u32
 	size       gg.Vec2
-	bearing    gg.Vec2
-	advance    u32
+	
+	horizontal_bearing_px gg.Vec2
+	horizontal_advance_px u32
+	
+	vertical_bearing_px   gg.Vec2
+	vertical_advance_px   u32
 }
 
 [typedef]
@@ -84,6 +90,19 @@ struct C.Bitmap {
 
 struct C.Advance {
 	x int
+	y int
+}
+
+[typedef]
+struct C.FT_Glyph_Metrics {
+	width        int
+	height       int
+	horiBearingX int
+	horiBearingY int
+	horiAdvance  int
+	vertBearingX int
+	vertBearingY int
+	vertAdvance  int
 }
 
 struct C.Glyph {
@@ -91,11 +110,14 @@ struct C.Glyph {
 	bitmap_left int
 	bitmap_top int
 	advance Advance
+	metrics FT_Glyph_Metrics 
 }
 
 [typedef]
 struct C.FT_Face {
 	glyph &Glyph
+	family_name charptr
+	style_name charptr
 }
 
 fn C.FT_Load_Char(voidptr, i64, int) int
@@ -104,12 +126,12 @@ fn ft_load_char(face C.FT_Face, code i64) Character {
 	//println('\nftload_char( code=$code)')
 	//C.printf('face=%p\n', face)
 	//C.printf('cobj=%p\n', _face.cobj)
-	ret := C.FT_Load_Char(face, code, C.FT_LOAD_RENDER)
+	ret := C.FT_Load_Char(face, code, C.FT_LOAD_RENDER|C.FT_LOAD_FORCE_AUTOHINT)
 	//println('ret=$ret')
 	if ret != 0 {
 		println('freetype: failed to load glyph (utf32 code=$code, ' +
 			'error code=$ret)')
-		return Character{}
+		return Character{code: code}
 	}
 	// Generate texture
 	mut texture := 0
@@ -124,14 +146,19 @@ fn ft_load_char(face C.FT_Face, code i64) Character {
 	C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_WRAP_T, C.GL_CLAMP_TO_EDGE)
 	C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, C.GL_LINEAR)
 	C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, C.GL_LINEAR)
-	fgleft := face.glyph.bitmap_left
-	fgtop := face.glyph.bitmap_top
 	// Create the character
 	return Character {
+		code: code
 		texture_id: u32(texture)
-		size:    gg.vec2(int(u32(fgwidth)), int(u32(fgrows)))
-		bearing: gg.vec2(int(u32(fgleft)), int(u32(fgtop)))
-		advance: (u32(face.glyph.advance.x))
+		size:    gg.vec2(fgwidth, fgrows)
+
+		// Note: advance is number of 1/64 pixels
+		// Bitshift by 6 to get value in pixels (2^6 = 64 (divide amount of 1/64th pixels by 64 to get amount of pixels))		
+		horizontal_bearing_px:  gg.vec2(face.glyph.metrics.horiBearingX >> 6, face.glyph.metrics.horiBearingY >> 6)
+		vertical_bearing_px:    gg.vec2(face.glyph.metrics.vertBearingX >> 6, face.glyph.metrics.vertBearingY >> 6) // not used for now
+		
+		horizontal_advance_px:  face.glyph.metrics.horiAdvance >> 6
+		vertical_advance_px:    face.glyph.metrics.vertAdvance >> 6
 	}
 }
 
@@ -316,8 +343,8 @@ fn (ctx mut FreeType) private_draw_text(_x, _y int, utext ustring, cfg gx.TextCf
 			//exit(1)
 			// continue
 		}
-		xpos := x + f32(ch.bearing.x) * 1
-		ypos := y - f32(ch.size.y - ch.bearing.y) * 1
+		xpos := x + f32(ch.horizontal_bearing_px.x) * 1
+		ypos := y - f32(ch.size.y - ch.horizontal_bearing_px.y) * 1
 		w := f32(ch.size.x) * 1
 		h := f32(ch.size.y) * 1
 		// Update VBO for each character
@@ -337,9 +364,7 @@ fn (ctx mut FreeType) private_draw_text(_x, _y int, utext ustring, cfg gx.TextCf
 		C.glBufferData(C.GL_ARRAY_BUFFER, 96, vertices.data, C.GL_DYNAMIC_DRAW)
 		// Render quad
 		gl.draw_arrays(C.GL_TRIANGLES, 0, 6)
-		// Now advance cursors for next glyph (note that advance is number of 1/64 pixels)
-		// Bitshift by 6 to get value in pixels (2^6 = 64 (divide amount of 1/64th pixels by 64 to get amount of pixels))
-		x += ch.advance >> u32(6)
+		x += f32(ch.horizontal_advance_px)
 	}
 	gl.bind_vao(u32(0))
 	C.glBindTexture(C.GL_TEXTURE_2D, 0)
@@ -355,12 +380,25 @@ pub fn (ctx mut FreeType) draw_text_def(x, y int, text string) {
 }
 
 pub fn (ctx mut FreeType) text_width(s string) int {
+	x, _ := ctx.text_size(s)
+	return x
+}
+
+pub fn (ctx mut FreeType) text_height(s string) int {
+	_, y := ctx.text_size(s)
+	return y
+}
+
+pub fn (ctx mut FreeType) text_size(s string) (int, int) {
 	//t := time.ticks()
 	utext := s.ustring()
-	mut x := f64(0)
+	mut x := u32(0)
+	mut maxy := u32(0)
+	mut _rune := ''
+	mut ch := Character{}
 	for i := 0; i < utext.len; i++ {
-		_rune := utext.at(i)
-		mut ch := Character{}
+		_rune = utext.at(i)
+		ch = Character{}		
 		mut found := false
 		if _rune.len == 1 {
 			idx := _rune[0]
@@ -387,10 +425,25 @@ pub fn (ctx mut FreeType) text_width(s string) int {
 			ctx.utf_runes << _rune
 			ctx.utf_chars << ch
 		}
-		x += ch.advance >> u32(6)
+		x += ch.horizontal_advance_px
+		if maxy < ch.vertical_advance_px {
+			maxy = ch.vertical_advance_px
+		}
 	}
 	//println('text width "$s" = ${time.ticks() - t} ms')
-	return  int(x) / ctx.scale
+	scaled_x := int(f64(x) / ctx.scale)
+	scaled_y := int(f64(maxy) / ctx.scale)
+	//println('text_size of "${s}" | x,y: $x,$maxy | scaled_x: ${scaled_x:3d} | scaled_y: ${scaled_y:3d} ')
+	return scaled_x, scaled_y
 }
 
-
+pub fn (f FT_Face) str() string {
+	return 'FT_Face{ style_name: ${ptr_str(f.style_name)} family_name: ${ptr_str(f.family_name)} }'
+}
+pub fn (ac []Character) str() string {
+	mut res := []string
+	for c in ac {
+		res << '  Character{ code: $c.code , texture_id: $c.texture_id }'
+	}
+	return '[\n' + res.join(',\n') + ']'
+}

vlib/gg/gg.v

@@ -17,6 +17,10 @@ pub:
 	y int
 }
 
+pub fn (v Vec2) str() string {
+	return 'Vec2{ x: $v.x y: $v.y }'
+}
+
 pub fn vec2(x, y int) Vec2 {
 	res := Vec2 {
 		x: x

vlib/gl/1shader.v

@@ -13,6 +13,9 @@ import glm
 pub struct Shader {
 	program_id int
 }
+pub fn (s Shader) str() string {
+	return 'Shader{ program_id: s.program_id }'
+}
 
 pub const (
 	TEXT_VERT   = '#version 330 core