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pngcp minimal configuration changes

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Corrections for the pngcp minimal configuration in libpng 1.7 and corrections to
the libpng 1.7 code to fix bugs revealed by the reduced configuration.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2016-07-01 22:39:13 -07:00
parent eaf7abfdc3
commit 6a574a84bd
8 changed files with 61 additions and 40 deletions
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8
pngwutil.c
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@@ -3689,7 +3689,6 @@ void /* PRIVATE */
png_write_start_IDAT(png_structrp png_ptr)
{
png_zlib_statep ps = get_zlib_state(png_ptr);
int png_level;
/* Set up the IDAT compression state. Expect the state to have been released
* by the previous owner, but it doesn't much matter if there was an error.
@@ -3700,12 +3699,13 @@ png_write_start_IDAT(png_structrp png_ptr)
/* This sets the buffer limits and write_row_size, which is used below. */
png_zlib_state_set_buffer_limits(png_ptr, ps);
/* Now default the filter mask if it hasn't been set already: */
png_level = pz_get(ps, IDAT, png_level, PNG_DEFAULT_COMPRESSION_LEVEL);
if (ps->filter_mask == 0)
{
# ifdef PNG_SELECT_FILTER_SUPPORTED
/* Now default the filter mask if it hasn't been set already: */
int png_level =
pz_get(ps, IDAT, png_level, PNG_DEFAULT_COMPRESSION_LEVEL);
/* If the bit depth is less than 8, so pixels are not byte aligned, PNG
* filtering hardly ever helps because there is no correlation between
* the bytes on which the filter works and the actual pixel values.