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Make png compression go faster

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This commit is contained in:
Robert Grant 2014-02-14 11:09:00 -08:00
parent dc1f86a039
commit f593921075
1 changed files with 5 additions and 2 deletions
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7
Onyx2D/O2Encoder_PNG.m
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@ -44,8 +44,11 @@ void O2PNGEncoderWriteImage(O2PNGEncoderRef self,O2ImageRef image,CFDictionaryRe
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
png_infop info_ptr = png_create_info_struct(png_ptr);
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
// Default options for png compression are quite slow.
// These settings speed it up a lot without sacrificing a lot of disk space
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);
png_set_compression_level(png_ptr, 3); // range is 0 (NONE) to 9 (BEST) - 3 is a reasonable compromise
if (setjmp(png_jmpbuf(png_ptr))) {
NSLog(@"Error initializing png encoder");