From a85157254bb42b4a1423d18d0509d763e3ee0cb4 Mon Sep 17 00:00:00 2001 From: June McEnroe Date: Tue, 20 Feb 2018 11:34:02 -0500 Subject: Always use None filter for indexed or bit depth < 8 --- bin/pngo.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/bin/pngo.c b/bin/pngo.c index 90ebeea8..588eaccf 100644 --- a/bin/pngo.c +++ b/bin/pngo.c @@ -402,11 +402,19 @@ static void reconData(void) { static void filterData(void) { for (uint32_t y = header.height - 1; y < header.height; --y) { + if (header.color == INDEXED || header.depth < 8) { + *lines[y].type = NONE; + for (size_t i = lineSize() - 1; i < lineSize(); --i) { + lines[y].data[i] = filt(NONE, origBytes(y, i)); + } + continue; + } + uint8_t filter[FILTER_COUNT][lineSize()]; uint32_t heuristic[FILTER_COUNT] = { 0 }; enum Filter minType = NONE; for (enum Filter type = NONE; type < FILTER_COUNT; ++type) { - for (uint32_t i = 0; i < lineSize(); ++i) { + for (size_t i = 0; i < lineSize(); ++i) { filter[type][i] = filt(type, origBytes(y, i)); heuristic[type] += abs((int8_t)filter[type][i]); } -- cgit 1.4.1