Font preview for file browser

D1002 by @plasmasolutions, with own refactoring.

Note, needed to do a bad-level call here (IMB -> BLF)
Also can't use the BLF API directly because its not thread-safe.
So keep the function isolated (blf_thumbs.c).

2 files changed, 17 insertions, 7 deletions

diff --git a/source/blender/editors/space_file/file_draw.c b/source/blender/editors/space_file/file_draw.c
index 98c7ddeff77..a6f3a73841e 100644
--- a/source/blender/editors/space_file/file_draw.c
+++ b/source/blender/editors/space_file/file_draw.c
@@ -323,7 +323,7 @@ void file_calc_previews(const bContext *C, ARegion *ar)
 	UI_view2d_totRect_set(v2d, sfile->layout->width, sfile->layout->height);
 }
 
-static void file_draw_preview(uiBlock *block, struct direntry *file, int sx, int sy, ImBuf *imb, FileLayout *layout, bool dropshadow, bool drag)
+static void file_draw_preview(uiBlock *block, struct direntry *file, int sx, int sy, ImBuf *imb, FileLayout *layout, bool is_icon, bool drag)
 {
 	uiBut *but;
 	float fx, fy;
@@ -332,6 +332,7 @@ static void file_draw_preview(uiBlock *block, struct direntry *file, int sx, int
 	float scaledx, scaledy;
 	float scale;
 	int ex, ey;
+	bool use_dropshadow = !is_icon && (file->flags & FILE_TYPE_IMAGE);
 
 	BLI_assert(imb != NULL);
 
@@ -367,17 +368,23 @@ static void file_draw_preview(uiBlock *block, struct direntry *file, int sx, int
 	glBlendFunc(GL_SRC_ALPHA,  GL_ONE_MINUS_SRC_ALPHA);
 
 	/* shadow */
-	if (dropshadow)
+	if (use_dropshadow) {
 		UI_draw_box_shadow(220, (float)xco, (float)yco, (float)(xco + ex), (float)(yco + ey));
+	}
 
 	glEnable(GL_BLEND);
 
 	/* the image */
-	glColor4f(1.0, 1.0, 1.0, 1.0);
+	if (!is_icon && file->flags & FILE_TYPE_FTFONT) {
+		UI_ThemeColor(TH_TEXT);
+	}
+	else {
+		glColor4f(1.0, 1.0, 1.0, 1.0);
+	}
 	glaDrawPixelsTexScaled((float)xco, (float)yco, imb->x, imb->y, GL_RGBA, GL_UNSIGNED_BYTE, GL_NEAREST, imb->rect, scale, scale);
 
 	/* border */
-	if (dropshadow) {
+	if (use_dropshadow) {
 		glColor4f(0.0f, 0.0f, 0.0f, 0.4f);
 		fdrawbox((float)xco, (float)yco, (float)(xco + ex), (float)(yco + ey));
 	}
@@ -549,7 +556,7 @@ void file_draw_list(const bContext *C, ARegion *ar)
 				is_icon = 1;
 			}
 
-			file_draw_preview(block, file, sx, sy, imb, layout, !is_icon && (file->flags & FILE_TYPE_IMAGE), do_drag);
+			file_draw_preview(block, file, sx, sy, imb, layout, is_icon, do_drag);
 		}
 		else {
 			file_draw_icon(block, file->path, sx, sy - (UI_UNIT_Y / 6), get_file_icon(file), ICON_DEFAULT_WIDTH_SCALE, ICON_DEFAULT_HEIGHT_SCALE, do_drag);
diff --git a/source/blender/editors/space_file/filelist.c b/source/blender/editors/space_file/filelist.c
index 66acd7d05e3..5214b611fb9 100644
--- a/source/blender/editors/space_file/filelist.c
+++ b/source/blender/editors/space_file/filelist.c
@@ -1348,6 +1348,9 @@ static void thumbnails_startjob(void *tjv, short *stop, short *do_update, float
 				limg->flags |= FILE_TYPE_MOVIE_ICON;
 			}
 		}
+		else if (limg->flags & FILE_TYPE_FTFONT) {
+			limg->img = IMB_thumb_manage(limg->path, THB_NORMAL, THB_SOURCE_FONT);
+		}
 		*do_update = true;
 		PIL_sleep_ms(10);
 		limg = limg->next;
@@ -1363,7 +1366,7 @@ static void thumbnails_update(void *tjv)
 		while (limg) {
 			if (!limg->done && limg->img) {
 				tj->filelist->filelist[limg->index].image = IMB_dupImBuf(limg->img);
-				/* update flag for movie files where thumbnail can't be created */
+				/* update flag for movie and font files where thumbnail can't be created */
 				if (limg->flags & FILE_TYPE_MOVIE_ICON) {
 					tj->filelist->filelist[limg->index].flags &= ~FILE_TYPE_MOVIE;
 					tj->filelist->filelist[limg->index].flags |= FILE_TYPE_MOVIE_ICON;
@@ -1408,7 +1411,7 @@ void thumbnails_start(FileList *filelist, const bContext *C)
 			continue;
 		}
 		if (!filelist->filelist[idx].image) {
-			if (filelist->filelist[idx].flags & (FILE_TYPE_IMAGE | FILE_TYPE_MOVIE |
+			if (filelist->filelist[idx].flags & (FILE_TYPE_IMAGE | FILE_TYPE_MOVIE | FILE_TYPE_FTFONT |
 			                                     FILE_TYPE_BLENDER | FILE_TYPE_BLENDER_BACKUP))
 			{
 				FileImage *limg = MEM_callocN(sizeof(*limg), __func__);