BLF: initial word-wrap support

- Adds support for word wrapping to Blender's BLF font library.
- Splits lines when width limit is reached or on explicit \n newlines.

Details:

- Word wrapping is used when `BLF_WORD_WRAP` flag is enabled.
- There is a single loop to handle line wrapping,
  this runs callback, passing in a substring,
  this way we can avoid code-duplication for all word-wrapped
  versions of functions... OR... avoid having to add support
  for word-wrapping directly into each function.
- The `ResultBLF` struct was added to be able to get the number
  of wrapped lines, when calling otherwise unrelated functions
  such as `BLF_draw/BLF_width/BLF_boundbox`,
  which can be passed as the last argument to `BLF_*_ex()` functions.
- The `ResultBLF` struct is used to store the result of drawing
  (currently only the number of lines wrapped, and the width).

1 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/blenfont/intern/blf_thumbs.c b/source/blender/blenfont/intern/blf_thumbs.c
index 4eea5d581d0..76479593b54 100644
--- a/source/blender/blenfont/intern/blf_thumbs.c
+++ b/source/blender/blenfont/intern/blf_thumbs.c
@@ -84,7 +84,7 @@ void BLF_thumb_preview(
 
 	/* Always create the image with a white font,
 	 * the caller can theme how it likes */
-	memcpy(font->buf_info.col, font_color, sizeof(font->buf_info.col));
+	memcpy(font->buf_info.col_init, font_color, sizeof(font->buf_info.col_init));
 	font->pos[1] = (float)h;
 
 	font_size_curr = font_size;
@@ -110,10 +110,10 @@ void BLF_thumb_preview(
 		if (blf_font_count_missing_chars(
 		        font, draw_str_i18n, draw_str_i18n_len, &draw_str_i18n_nbr) > (draw_str_i18n_nbr / 2))
 		{
-			blf_font_buffer(font, draw_str[i]);
+			blf_font_draw_buffer(font, draw_str[i], (size_t)draw_str_i18n_nbr, NULL);
 		}
 		else {
-			blf_font_buffer(font, draw_str_i18n);
+			blf_font_draw_buffer(font, draw_str_i18n, draw_str_i18n_len, NULL);
 		}
 	}