in an idat chunk, each scanline is a multiple of 8 bits, unlike the lodepng output buffer, and in addition has one extra byte per line: the filter byt

Helpers

calculate bits per pixel out of colortype and bitdepth*/

NOTE: when realloc returns NULL, it leaves the original memory untouched */

Call IncludeItemByIndex() or IncludeItemsByIndex() *BEFORE* first call to Step() if you need a range of items to not be clipped, regardless of their v

Inputs FIXME: Eventually we should aim to move e.g. IsActiveIdUsingKey() into IsKeyXXX functions.

returns 1 if success, 0 if failure ==> nothing done*/

p_min = upper-left, p_max = lower-right

We should in theory be using fseeko()/ftello() with off_t and _fseeki64()/_ftelli64() with __int64, waiting for the PR that does that in a very portab

FIXME: Should rework API toward allowing multiple in-flight temp buffers (easier and safer for caller) by making the caller acquire a temp buffer toke

It is the map we need iterate to find valid items, since we don't have "alive" storage anywhere