diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/display/sp-canvas.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/display/sp-canvas.cpp b/src/display/sp-canvas.cpp index 88a457490..b042f0d68 100644 --- a/src/display/sp-canvas.cpp +++ b/src/display/sp-canvas.cpp @@ -1747,7 +1747,8 @@ faster. The default for now is the strips mode. */ if (bw < bh || bh < 2 * TILE_SIZE) { - int mid = (this_rect.x0 + this_rect.x1) / 2; + // to correctly calculate the mean of two ints, we need to sum them into a larger int type + int mid = ((long long) this_rect.x0 + (long long) this_rect.x1) / 2; // Make sure that mid lies on a tile boundary mid = (mid / TILE_SIZE) * TILE_SIZE; @@ -1763,7 +1764,8 @@ The default for now is the strips mode. && sp_canvas_paint_rect_internal(setup, lo); } } else { - int mid = (this_rect.y0 + this_rect.y1) / 2; + // to correctly calculate the mean of two ints, we need to sum them into a larger int type + int mid = ((long long) this_rect.y0 + (long long) this_rect.y1) / 2; // Make sure that mid lies on a tile boundary mid = (mid / TILE_SIZE) * TILE_SIZE; |