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stb_image_write.h: allow using custom zlib compress function 

the one from zlib compresses better than the builtin one and might even
be faster.
This commit is contained in:
Daniel Gibson 2017-03-12 22:34:46 +01:00
parent a1a634b95a
commit bbf36746c8
1 changed files with 21 additions and 0 deletions
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21
src/backends/generic/header/stb_image_write.h
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@ -1,3 +1,11 @@
/* !!! NOTE: this version of stb_image_write.h is modified !!!
* I added the following things:
* - JPEG support (maybe this gets upstream, we'll see: https://github.com/nothings/stb/pull/432
* - STBIW_ZLIB_COMPRESS to supply custom zlib compress()-like function for PNG
* - stbi_png_level to allow configuring PNG compression level
*/
/* stb_image_write - v1.05 - public domain - http://nothings.org/stb/stb_image_write.h
writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015
no warranty implied; use at your own risk
@ -664,6 +672,7 @@ STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const
//
// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
#ifndef STBIW_ZLIB_COMPRESS
#define stbiw__sbraw(a) ((int *) (a) - 2)
#define stbiw__sbm(a) stbiw__sbraw(a)[0]
#define stbiw__sbn(a) stbiw__sbraw(a)[1]
@ -743,8 +752,16 @@ static unsigned int stbiw__zhash(unsigned char *data)
#define stbiw__ZHASH 16384
#endif // STBIW_ZLIB_COMPRESS
#define MZ_MAX(a,b) (((a)>(b))?(a):(b))
unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
{
#ifdef STBIW_ZLIB_COMPRESS
// user provided a zlib compress implementation, use that
return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality);
#else // use our own
static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 };
static unsigned char lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 };
static unsigned short distc[] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 };
@ -752,6 +769,9 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
unsigned int bitbuf=0;
int i,j, bitcount=0;
unsigned char *out = NULL;
int guessedSize = MZ_MAX(128 + (data_len * 110) / 100, 128 + data_len + ((data_len / (31 * 1024)) + 1) * 5);
//stbiw__sbgrow(out, guessedSize);
unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(char**));
if (quality < 5) quality = 5;
@ -846,6 +866,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
// make returned pointer freeable
STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len);
return (unsigned char *) stbiw__sbraw(out);
#endif // !STBIW_ZLIB_COMPRESS
}
static unsigned int stbiw__crc32(unsigned char *buffer, int len)