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diff -r 4917a4242fc0 -r 50395430a371 coders/png.c
--- a/coders/png.c Fri May 01 13:49:13 2020 -0500
+++ b/coders/png.c Sat May 30 10:18:16 2020 -0500
@@ -5304,7 +5304,7 @@
if (logging)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
"MAGN chunk (%lu bytes): "
- "First_magnified_object_id=%u, Last_magnified_object_id=%u, "
+ "First_magnified_object_id=%u, Las t_magnified_object_id=%u, "
"MB=%u, ML=%u, MR=%u, MT=%u, MX=%u, MY=%u, "
"X_method=%u, Y_method=%u",
length,
@@ -5679,6 +5679,8 @@
/*
If magnifying and a supported method is requested then
magnify the image.
+
+ http://www.libpng.org/pub/mng/spec/mng-1.0-20010209-pdg.html#mng-MAGN
*/
if (((mng_info->magn_methx > 0) && (mng_info->magn_methx <= 5)) &&
((mng_info->magn_methy > 0) && (mng_info->magn_methy <= 5)))
@@ -5689,7 +5691,28 @@
if (logging)
(void) LogMagickEvent(CoderEvent,GetMagickModule(),
- " Processing MNG MAGN chunk");
+ " Processing MNG MAGN chunk: MB=%u, ML=%u,"
+ " MR=%u, MT=%u, MX=%u, MY=%u,"
+ " X_method=%u, Y_method=%u",
+ mng_info->magn_mb,mng_info->magn_ml,
+ mng_info->magn_mr,mng_info->magn_mt,
+ mng_info->magn_mx,mng_info->magn_my,
+ mng_info->magn_methx,
+ mng_info->magn_methy);
+
+ /*
+ If the image width is 1, then X magnification is done
+ by simple pixel replication.
+ */
+ if (image->columns == 1)
+ mng_info->magn_methx = 1;
+
+ /*
+ If the image height is 1, then Y magnification is done
+ by simple pixel replication.
+ */
+ if (image->rows == 1)
+ mng_info->magn_methy = 1;
if (mng_info->magn_methx == 1)
{
@@ -5734,12 +5757,10 @@
Image
*large_image;
- int
- yy;
-
long
m,
- y;
+ y,
+ yy;
register long
x;
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