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[libpng17] Use a user warning handler in contrib/gregbook/readpng2.c instead

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of default, so warnings will be put on stderr even if libpng has CONSOLE_IO
disabled.
This commit is contained in:
Glenn Randers-Pehrson
2014-02-23 10:08:50 -06:00
parent 0c5acfa19e
commit 4526f546ba
3 changed files with 14 additions and 5 deletions
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9
contrib/gregbook/readpng2.c
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@@ -69,6 +69,7 @@ static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass);
static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);
static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
static void readpng2_warning_handler(png_structp png_ptr, png_const_charp msg);
@@ -104,7 +105,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
/* could also replace libpng warning-handler (final NULL), but no need: */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
readpng2_error_handler, NULL);
readpng2_error_handler, readpng2_warning_handler);
if (!png_ptr)
return 4; /* out of memory */
@@ -467,7 +468,11 @@ void readpng2_cleanup(mainprog_info *mainprog_ptr)
}
static void readpng2_warning_handler(png_structp png_ptr, png_const_charp msg)
{
fprintf(stderr, "readpng2 libpng warning: %s\n", msg);
fflush(stderr);
}
static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)