mirrors/stb
1
0
Fork 0
mirror of https://github.com/nothings/stb synced 2024-12-15 04:22:35 +03:00
Code Issues Packages Projects Releases Wiki Activity

Merge branch 'stb-image-writer-memory' of https://github.com/callidus/stb into work2

Browse Source
This commit is contained in:
Sean Barrett 2015-04-13 11:48:26 -07:00
commit 019236a624
1 changed files with 57 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
stb_image_write.h
View File

@ -1,4 +1,4 @@
/* stb_image_write - v0.97 - public domain - http://nothings.org/stb/stb_image_write.h
/* stb_image_write - v0.98 - public domain - http://nothings.org/stb/stb_image_write.h
writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010
no warranty implied; use at your own risk
@ -9,6 +9,10 @@
in the file that you want to have the implementation.
You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
You can optionally define STBI_MEMMOVE and STBI_MEMCPY if the default semantics of
memmove and memcpy would be incompatible with your choice of malloc et al.
Will probably not work correctly with strict-aliasing optimizations.
@ -67,6 +71,8 @@ CREDITS:
Jean-Sebastien Guay
Bugfixes:
Chribba@github
STBI_MALLOC etc:
callidus@github
*/
#ifndef INCLUDE_STB_IMAGE_WRITE_H
@ -93,9 +99,29 @@ extern int stbi_write_hdr(char const *filename, int w, int h, int comp, const fl
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#if defined(STBI_MALLOC) && defined(STBI_FREE) && defined(STBI_REALLOC)
// ok
#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC)
// ok
#else
#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC."
#endif
#ifndef STBI_MALLOC
#define STBI_MALLOC(sz) malloc(sz)
#define STBI_REALLOC(p,sz) realloc(p,sz)
#define STBI_FREE(p) free(p)
#define STBI_MEMMOVE(a,b,sz) memmove(a,b,sz)
#define STBI_MEMCPY(a,b,sz) memcpy(a,b,sz)
#endif
#ifndef STBI_ASSERT
#include <assert.h>
#define STBI_ASSERT(x) assert(x)
#endif
typedef unsigned int stbiw_uint32;
typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
@ -113,7 +139,7 @@ static void writefv(FILE *f, const char *fmt, va_list v)
b[2]=(unsigned char)(x>>16); b[3]=(unsigned char)(x>>24);
fwrite(b,4,1,f); break; }
default:
assert(0);
STBI_ASSERT(0);
return;
}
}
@ -232,7 +258,7 @@ void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear)
void stbiw__write_run_data(FILE *f, int length, unsigned char databyte)
{
unsigned char lengthbyte = (unsigned char) (length+128);
assert(length+128 <= 255);
STBI_ASSERT(length+128 <= 255);
fwrite(&lengthbyte, 1, 1, f);
fwrite(&databyte, 1, 1, f);
}
@ -240,7 +266,7 @@ void stbiw__write_run_data(FILE *f, int length, unsigned char databyte)
void stbiw__write_dump_data(FILE *f, int length, unsigned char *data)
{
unsigned char lengthbyte = (unsigned char )(length & 0xff);
assert(length <= 128); // inconsistent with spec but consistent with official code
STBI_ASSERT(length <= 128); // inconsistent with spec but consistent with official code
fwrite(&lengthbyte, 1, 1, f);
fwrite(data, length, 1, f);
}
@ -342,12 +368,12 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
f = fopen(filename, "wb");
if (f) {
/* Each component is stored separately. Allocate scratch space for full output scanline. */
unsigned char *scratch = (unsigned char *) malloc(x*4);
unsigned char *scratch = (unsigned char *) STBI_MALLOC(x*4);
fprintf(f, "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n" );
fprintf(f, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n" , y, x);
for(i=0; i < y; i++)
stbiw__write_hdr_scanline(f, x, comp, scratch, data + comp*i*x);
free(scratch);
STBI_FREE(scratch);
fclose(f);
}
return f != NULL;
@ -367,13 +393,13 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v))
#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0)
#define stbiw__sbfree(a) ((a) ? free(stbiw__sbraw(a)),0 : 0)
#define stbiw__sbfree(a) ((a) ? STBI_FREE(stbiw__sbraw(a)),0 : 0)
static void *stbiw__sbgrowf(void **arr, int increment, int itemsize)
{
int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1;
void *p = realloc(*arr ? stbiw__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
assert(p);
void *p = STBI_REALLOC(*arr ? stbiw__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
STBI_ASSERT(p);
if (p) {
if (!*arr) ((int *) p)[1] = 0;
*arr = (void *) ((int *) p + 2);
@ -471,7 +497,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
}
// when hash table entry is too long, delete half the entries
if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) {
memcpy(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
STBI_MEMCPY(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
stbiw__sbn(hash_table[h]) = quality;
}
stbiw__sbpush(hash_table[h],data+i);
@ -494,7 +520,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
if (bestloc) {
int d = (int) (data+i - bestloc); // distance back
assert(d <= 32767 && best <= 258);
STBI_ASSERT(d <= 32767 && best <= 258);
for (j=0; best > lengthc[j+1]-1; ++j);
stbiw__zlib_huff(j+257);
if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
@ -535,7 +561,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
}
*out_len = stbiw__sbn(out);
// make returned pointer freeable
memmove(stbiw__sbraw(out), out, *out_len);
STBI_MEMMOVE(stbiw__sbraw(out), out, *out_len);
return (unsigned char *) stbiw__sbraw(out);
}
@ -582,8 +608,8 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
if (stride_bytes == 0)
stride_bytes = x * n;
filt = (unsigned char *) malloc((x*n+1) * y); if (!filt) return 0;
line_buffer = (signed char *) malloc(x * n); if (!line_buffer) { free(filt); return 0; }
filt = (unsigned char *) STBI_MALLOC((x*n+1) * y); if (!filt) return 0;
line_buffer = (signed char *) STBI_MALLOC(x * n); if (!line_buffer) { STBI_FREE(filt); return 0; }
for (j=0; j < y; ++j) {
static int mapping[] = { 0,1,2,3,4 };
static int firstmap[] = { 0,1,0,5,6 };
@ -622,20 +648,20 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
}
// when we get here, best contains the filter type, and line_buffer contains the data
filt[j*(x*n+1)] = (unsigned char) best;
memcpy(filt+j*(x*n+1)+1, line_buffer, x*n);
STBI_MEMCPY(filt+j*(x*n+1)+1, line_buffer, x*n);
}
free(line_buffer);
STBI_FREE(line_buffer);
zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory
free(filt);
STBI_FREE(filt);
if (!zlib) return 0;
// each tag requires 12 bytes of overhead
out = (unsigned char *) malloc(8 + 12+13 + 12+zlen + 12);
out = (unsigned char *) STBI_MALLOC(8 + 12+13 + 12+zlen + 12);
if (!out) return 0;
*out_len = 8 + 12+13 + 12+zlen + 12;
o=out;
memcpy(o,sig,8); o+= 8;
STBI_MEMCPY(o,sig,8); o+= 8;
stbiw__wp32(o, 13); // header length
stbiw__wptag(o, "IHDR");
stbiw__wp32(o, x);
@ -649,14 +675,14 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
stbiw__wp32(o, zlen);
stbiw__wptag(o, "IDAT");
memcpy(o, zlib, zlen); o += zlen; free(zlib);
STBI_MEMCPY(o, zlib, zlen); o += zlen; STBI_FREE(zlib);
stbiw__wpcrc(&o, zlen);
stbiw__wp32(o,0);
stbiw__wptag(o, "IEND");
stbiw__wpcrc(&o,0);
assert(o == out + *out_len);
STBI_ASSERT(o == out + *out_len);
return out;
}
@ -668,16 +694,17 @@ int stbi_write_png(char const *filename, int x, int y, int comp, const void *dat
unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len);
if (!png) return 0;
f = fopen(filename, "wb");
if (!f) { free(png); return 0; }
if (!f) { STBI_FREE(png); return 0; }
fwrite(png, 1, len, f);
fclose(f);
free(png);
STBI_FREE(png);
return 1;
}
#endif // STB_IMAGE_WRITE_IMPLEMENTATION
/* Revision history
0.98 (2015-04-08)
added STBI_MALLOC, STBI_ASSERT etc
0.97 (2015-01-18)
fixed HDR asserts, rewrote HDR rle logic
0.96 (2015-01-17)