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, 9 insertions, 9 deletions

diff --git a/source/blender/blenkernel/intern/image_gen.c b/source/blender/blenkernel/intern/image_gen.c
index 4f9ed5f258d..303d0c6adfc 100644
--- a/source/blender/blenkernel/intern/image_gen.c
+++ b/source/blender/blenkernel/intern/image_gen.c
@@ -309,26 +309,26 @@ static void checker_board_text(unsigned char *rect, float *rect_float, int width
 			BLF_buffer_col(mono, 1.0, 1.0, 1.0, 1.0);
 
 			BLF_position(mono, pen_x - outline, pen_y, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 			BLF_position(mono, pen_x + outline, pen_y, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 			BLF_position(mono, pen_x, pen_y - outline, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 			BLF_position(mono, pen_x, pen_y + outline, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 
 			BLF_position(mono, pen_x - outline, pen_y - outline, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 			BLF_position(mono, pen_x + outline, pen_y + outline, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 			BLF_position(mono, pen_x - outline, pen_y + outline, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 			BLF_position(mono, pen_x + outline, pen_y - outline, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 
 			BLF_buffer_col(mono, 0.0, 0.0, 0.0, 1.0);
 			BLF_position(mono, pen_x, pen_y, 0.0);
-			BLF_draw_buffer(mono, text);
+			BLF_draw_buffer(mono, text, 2);
 
 			text[1]++;
 		}