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Merge branch 'stb_image_write_optimization' of https://github.com/jarnoh/stb into working

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This commit is contained in:
Sean Barrett 2019-02-07 08:11:38 -08:00
commit d27796b585
1 changed files with 12 additions and 0 deletions
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12
stb_image_write.h
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@ -973,6 +973,9 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
static unsigned int stbiw__crc32(unsigned char *buffer, int len)
{
#ifdef STBIW_CRC32
return STBIW_CRC32(buffer, len);
#else
static unsigned int crc_table[256] =
{
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
@ -1014,6 +1017,7 @@ static unsigned int stbiw__crc32(unsigned char *buffer, int len)
for (i=0; i < len; ++i)
crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)];
return ~crc;
#endif
}
#define stbiw__wpng4(o,a,b,c,d) ((o)[0]=STBIW_UCHAR(a),(o)[1]=STBIW_UCHAR(b),(o)[2]=STBIW_UCHAR(c),(o)[3]=STBIW_UCHAR(d),(o)+=4)
@ -1044,6 +1048,14 @@ static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int
int type = mymap[filter_type];
unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y);
int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes;
// sorry for not optimizing the other paths
if(type==0)
{
memcpy(line_buffer, z, width*n);
return;
}
for (i = 0; i < n; ++i) {
switch (type) {
case 0: line_buffer[i] = z[i]; break;