Added the get_line_height to font_renderer_driver_t and a first implementation of it in gl_raster (\n) and bitmapfont

gfx/drivers_font/gl_raster_font.c

@@ -172,7 +172,7 @@ static void gl_raster_font_draw_vertices(gl_t *gl, const gl_coords_t *coords)
    glDrawArrays(GL_TRIANGLES, 0, coords->vertices);
 }
 
-static void gl_raster_font_render_message(
+static void gl_raster_font_render_line(
       gl_raster_t *font, const char *msg, GLfloat scale,
       const GLfloat color[4], GLfloat pos_x, GLfloat pos_y,
       unsigned text_align)
@@ -262,6 +262,41 @@ static void gl_raster_font_render_message(
    }
 }
 
+//TODO Support scale
+//TODO Line height
+//TODO Adapt this to all drivers
+static void gl_raster_font_render_message(
+      gl_raster_t *font, const char *msg, GLfloat scale,
+      const GLfloat color[4], GLfloat pos_x, GLfloat pos_y,
+      unsigned text_align)
+{
+    //If the font height is not supported just draw like as usual
+    if (!font->font_driver->get_line_height)
+    {
+        gl_raster_font_render_line(font, msg, scale, color, pos_x, pos_y, text_align);
+        return;
+    }
+    
+    char* copy = strdup(msg);
+    
+    char* next_line = strtok(copy, "\n");
+    int lines = 0;
+    
+    float line_height = scale * 1/(float)font->font_driver->get_line_height(font->font_data);
+    
+    while (next_line != NULL) 
+    {
+        //Draw the line
+        gl_raster_font_render_line(font, next_line, scale, color, pos_x, pos_y - (float)lines*line_height, text_align);
+        
+        //Continue to split
+        next_line = strtok(NULL, "\n");
+        lines++;
+    }
+    
+    free(copy);
+}
+
 static void gl_raster_font_setup_viewport(gl_raster_t *font, bool full_screen)
 {
    unsigned width, height;

gfx/drivers_font_renderer/bitmapfont.c

@@ -128,6 +128,16 @@ static const char *font_renderer_bmp_get_default_font(void)
    return "";
 }
 
+static int font_renderer_bmp_get_line_height(void* data)
+{
+    bm_renderer_t *handle = (bm_renderer_t*)data;
+    
+    if (!handle)
+      return FONT_HEIGHT;
+      
+    return FONT_HEIGHT * handle->scale_factor;
+}
+
 font_renderer_driver_t bitmap_font_renderer = {
    font_renderer_bmp_init,
    font_renderer_bmp_get_atlas,
@@ -135,5 +145,6 @@ font_renderer_driver_t bitmap_font_renderer = {
    font_renderer_bmp_free,
    font_renderer_bmp_get_default_font,
    "bitmap",
+   font_renderer_bmp_get_line_height,
 };
 

gfx/drivers_font_renderer/coretext.c

@@ -293,4 +293,5 @@ font_renderer_driver_t coretext_font_renderer = {
   font_renderer_ct_free,
   font_renderer_ct_get_default_font,
   "coretext",
+  NULL, /*get_line_height*/
 };

gfx/drivers_font_renderer/freetype.c

@@ -226,6 +226,15 @@ static const char *font_renderer_ft_get_default_font(void)
    return NULL;
 }
 
+static int font_renderer_ft_get_line_height(void* data)
+{
+    ft_font_renderer_t *handle = (ft_font_renderer_t*)data;
+    if (!handle)
+      return 0;
+      
+    return handle->face->size->metrics->height;
+}
+
 font_renderer_driver_t freetype_font_renderer = {
    font_renderer_ft_init,
    font_renderer_ft_get_atlas,
@@ -233,4 +242,5 @@ font_renderer_driver_t freetype_font_renderer = {
    font_renderer_ft_free,
    font_renderer_ft_get_default_font,
    "freetype",
+   NULL, /*get_line_height*/
 };

gfx/font_renderer_driver.h

@@ -94,6 +94,8 @@ typedef struct font_renderer_driver
    const char *(*get_default_font)(void);
 
    const char *ident;
+   
+   int (*get_line_height)(void* data);
 } font_renderer_driver_t;
 
 extern font_renderer_driver_t freetype_font_renderer;