diff options
Diffstat (limited to 'base/gxscanc.c')
| -rw-r--r-- | base/gxscanc.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/base/gxscanc.c b/base/gxscanc.c index 7776d486..9842b2c3 100644 --- a/base/gxscanc.c +++ b/base/gxscanc.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2001-2020 Artifex Software, Inc. +/* Copyright (C) 2001-2021 Artifex Software, Inc. All Rights Reserved. This software is provided AS-IS with no warranty, either express or @@ -3627,7 +3627,9 @@ no_merge: } else if (sx < ex) { /* Lines increasing in x. (Rightwards, rising) */ int phase1_x_steps, phase3_x_steps; - fixed x_steps = ex - sx; + /* Use unsigned int here, to allow for extreme cases like + * ex = 0x7fffffff, sx = 0x80000000 */ + unsigned int x_steps = ex - sx; /* Phase 1: */ if (phase1_y_steps) { @@ -3693,7 +3695,9 @@ no_merge: } else { /* Lines decreasing in x. (Leftwards, rising) */ int phase1_x_steps, phase3_x_steps; - fixed x_steps = sx - ex; + /* Use unsigned int here, to allow for extreme cases like + * sx = 0x7fffffff, ex = 0x80000000 */ + unsigned int x_steps = sx - ex; /* Phase 1: */ if (phase1_y_steps) { @@ -3813,7 +3817,9 @@ endFallingLeftOnEdgeOfPixel: } else if (sx < ex) { /* Lines increasing in x. (Rightwards, falling) */ int phase1_x_steps, phase3_x_steps; - fixed x_steps = ex - sx; + /* Use unsigned int here, to allow for extreme cases like + * ex = 0x7fffffff, sx = 0x80000000 */ + unsigned int x_steps = ex - sx; /* Phase 1: */ if (phase1_y_steps) { @@ -3878,7 +3884,9 @@ endFallingRightOnEdgeOfPixel: } else { /* Lines decreasing in x. (Falling) */ int phase1_x_steps, phase3_x_steps; - fixed x_steps = sx - ex; + /* Use unsigned int here, to allow for extreme cases like + * sx = 0x7fffffff, ex = 0x80000000 */ + unsigned int x_steps = sx - ex; /* Phase 1: */ if (phase1_y_steps) { |