From 56d22457e320df0bdcdcfd8d7af5e1958ddb201f Mon Sep 17 00:00:00 2001 From: Sergey Sharybin Date: Thu, 3 May 2012 10:40:04 +0000 Subject: [PATCH] Fix #31266: Track preview is shifted by half a pixel --- source/blender/editors/interface/interface_draw.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/source/blender/editors/interface/interface_draw.c b/source/blender/editors/interface/interface_draw.c index 91d3c890df3..d90d8286db9 100644 --- a/source/blender/editors/interface/interface_draw.c +++ b/source/blender/editors/interface/interface_draw.c @@ -1469,8 +1469,11 @@ static ImBuf *scale_trackpreview_ibuf(ImBuf *ibuf, float track_pos[2], int width ImBuf *scaleibuf; const float scalex = ((float)ibuf->x - 2 * margin) / width; const float scaley = ((float)ibuf->y - 2 * margin) / height; - float off_x = (int)track_pos[0] - track_pos[0] + 0.5f; - float off_y = (int)track_pos[1] - track_pos[1] + 0.5f; + /* NOTE: 1.0f = 0.5f for integer coordinate coorrection (center of pixel vs. left bottom corner of bixel) + * and 0.5f for centering image in preview (cross is draving at exact center of widget so image + * should be shifted by half of pixel for correct centering) - sergey */ + float off_x = (int)track_pos[0] - track_pos[0] + 1.0f; + float off_y = (int)track_pos[1] - track_pos[1] + 1.0f; int x, y; scaleibuf = IMB_allocImBuf(width, height, 32, IB_rect);