Merge branch 'stb_image_write' into release-0.22

converters/sixel2png.c

@@ -57,6 +57,8 @@
 #include <sixel.h>
 #include "stb_image_write.h"
 
+unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len);
+
 #if !defined(O_BINARY) && defined(_O_BINARY)
 # define O_BINARY _O_BINARY
 #endif  /* !defined(O_BINARY) && !defined(_O_BINARY) */
@@ -142,6 +144,7 @@ sixel_to_png(const char *input, const char *output)
         fprintf(stderr, "LibSixel_SixelToLSImage failed.\n");
         return (-1);
     }
+
     png_data = stbi_write_png_to_mem(im->pixels, im->sx * 3,
                                      im->sx, im->sy, STBI_rgb, &png_len);
     LSImage_destroy(im);

converters/stb_image_write.h

@@ -1,4 +1,4 @@
-/* stbiw-0.92 - public domain - http://nothings.org/stb/stb_image_write.h
+/* stb_image_write - v0.94 - 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 +9,8 @@ Before including,
 
 in the file that you want to have the implementation.
 
+Will probably not work correctly with strict-aliasing optimizations.
+
 
 ABOUT:
 
@@ -61,7 +63,6 @@ extern "C" {
 extern int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
 extern int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
 extern int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
-unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len);
 
 #ifdef __cplusplus
 }
@@ -182,43 +183,43 @@ int stbi_write_tga(char const *filename, int x, int y, int comp, const void *dat
                   "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha);
 }
 
-// stretchy buffer; stbi__sbpush() == vector<>::push_back() -- stbi__sbcount() == vector<>::size()
-#define stbi__sbraw(a) ((int *) (a) - 2)
-#define stbi__sbm(a)   stbi__sbraw(a)[0]
-#define stbi__sbn(a)   stbi__sbraw(a)[1]
+// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
+#define stbiw__sbraw(a) ((int *) (a) - 2)
+#define stbiw__sbm(a)   stbiw__sbraw(a)[0]
+#define stbiw__sbn(a)   stbiw__sbraw(a)[1]
 
-#define stbi__sbneedgrow(a,n)  ((a)==0 || stbi__sbn(a)+n >= stbi__sbm(a))
-#define stbi__sbmaybegrow(a,n) (stbi__sbneedgrow(a,(n)) ? stbi__sbgrow(a,n) : 0)
-#define stbi__sbgrow(a,n)  stbi__sbgrowf((void **) &(a), (n), sizeof(*(a)))
+#define stbiw__sbneedgrow(a,n)  ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a))
+#define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0)
+#define stbiw__sbgrow(a,n)  stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a)))
 
-#define stbi__sbpush(a, v)      (stbi__sbmaybegrow(a,1), (a)[stbi__sbn(a)++] = (v))
-#define stbi__sbcount(a)        ((a) ? stbi__sbn(a) : 0)
-#define stbi__sbfree(a)         ((a) ? free(stbi__sbraw(a)),0 : 0)
+#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)
 
-static void *stbi__sbgrowf(void **arr, int increment, int itemsize)
+static void *stbiw__sbgrowf(void **arr, int increment, int itemsize)
 {
-   int m = *arr ? 2*stbi__sbm(*arr)+increment : increment+1;
-   void *p = realloc(*arr ? stbi__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
+   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);
    if (p) {
       if (!*arr) ((int *) p)[1] = 0;
       *arr = (void *) ((int *) p + 2);
-      stbi__sbm(*arr) = m;
+      stbiw__sbm(*arr) = m;
    }
    return *arr;
 }
 
-static unsigned char *stbi__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount)
+static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount)
 {
    while (*bitcount >= 8) {
-      stbi__sbpush(data, (unsigned char) *bitbuffer);
+      stbiw__sbpush(data, (unsigned char) *bitbuffer);
       *bitbuffer >>= 8;
       *bitcount -= 8;
    }
    return data;
 }
 
-static int stbi__zlib_bitrev(int code, int codebits)
+static int stbiw__zlib_bitrev(int code, int codebits)
 {
    int res=0;
    while (codebits--) {
@@ -228,15 +229,15 @@ static int stbi__zlib_bitrev(int code, int codebits)
    return res;
 }
 
-static unsigned int stbi__zlib_countm(unsigned char *a, unsigned char *b, int limit)
+static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit)
 {
    int i;
    for (i=0; i < limit && i < 258; ++i)
       if (a[i] != b[i]) break;
    return i;
 }
 
-static unsigned int stbi__zhash(unsigned char *data)
+static unsigned int stbiw__zhash(unsigned char *data)
 {
    stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16);
    hash ^= hash << 3;
@@ -248,19 +249,19 @@ static unsigned int stbi__zhash(unsigned char *data)
    return hash;
 }
 
-#define stbi__zlib_flush() (out = stbi__zlib_flushf(out, &bitbuf, &bitcount))
-#define stbi__zlib_add(code,codebits) \
-      (bitbuf |= (code) << bitcount, bitcount += (codebits), stbi__zlib_flush())
-#define stbi__zlib_huffa(b,c)  stbi__zlib_add(stbi__zlib_bitrev(b,c),c)
+#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount))
+#define stbiw__zlib_add(code,codebits) \
+      (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush())
+#define stbiw__zlib_huffa(b,c)  stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c)
 // default huffman tables
-#define stbi__zlib_huff1(n)  stbi__zlib_huffa(0x30 + (n), 8)
-#define stbi__zlib_huff2(n)  stbi__zlib_huffa(0x190 + (n)-144, 9)
-#define stbi__zlib_huff3(n)  stbi__zlib_huffa(0 + (n)-256,7)
-#define stbi__zlib_huff4(n)  stbi__zlib_huffa(0xc0 + (n)-280,8)
-#define stbi__zlib_huff(n)  ((n) <= 143 ? stbi__zlib_huff1(n) : (n) <= 255 ? stbi__zlib_huff2(n) : (n) <= 279 ? stbi__zlib_huff3(n) : stbi__zlib_huff4(n))
-#define stbi__zlib_huffb(n) ((n) <= 143 ? stbi__zlib_huff1(n) : stbi__zlib_huff2(n))
+#define stbiw__zlib_huff1(n)  stbiw__zlib_huffa(0x30 + (n), 8)
+#define stbiw__zlib_huff2(n)  stbiw__zlib_huffa(0x190 + (n)-144, 9)
+#define stbiw__zlib_huff3(n)  stbiw__zlib_huffa(0 + (n)-256,7)
+#define stbiw__zlib_huff4(n)  stbiw__zlib_huffa(0xc0 + (n)-280,8)
+#define stbiw__zlib_huff(n)  ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n))
+#define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n))
 
-#define stbi__ZHASH   16384
+#define stbiw__ZHASH   16384
 
 unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
 {
@@ -271,45 +272,45 @@ 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;
-   unsigned char **hash_table[stbi__ZHASH]; // 64KB on the stack!
+   unsigned char **hash_table[stbiw__ZHASH]; // 64KB on the stack!
    if (quality < 5) quality = 5;
 
-   stbi__sbpush(out, 0x78);   // DEFLATE 32K window
-   stbi__sbpush(out, 0x5e);   // FLEVEL = 1
-   stbi__zlib_add(1,1);  // BFINAL = 1
-   stbi__zlib_add(1,2);  // BTYPE = 1 -- fixed huffman
+   stbiw__sbpush(out, 0x78);   // DEFLATE 32K window
+   stbiw__sbpush(out, 0x5e);   // FLEVEL = 1
+   stbiw__zlib_add(1,1);  // BFINAL = 1
+   stbiw__zlib_add(1,2);  // BTYPE = 1 -- fixed huffman
 
-   for (i=0; i < stbi__ZHASH; ++i)
+   for (i=0; i < stbiw__ZHASH; ++i)
       hash_table[i] = NULL;
 
    i=0;
    while (i < data_len-3) {
       // hash next 3 bytes of data to be compressed
-      int h = stbi__zhash(data+i)&(stbi__ZHASH-1), best=3;
+      int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3;
       unsigned char *bestloc = 0;
       unsigned char **hlist = hash_table[h];
-      int n = stbi__sbcount(hlist);
+      int n = stbiw__sbcount(hlist);
       for (j=0; j < n; ++j) {
          if (hlist[j]-data > i-32768) { // if entry lies within window
-            int d = stbi__zlib_countm(hlist[j], data+i, data_len-i);
+            int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i);
             if (d >= best) best=d,bestloc=hlist[j];
          }
       }
       // when hash table entry is too long, delete half the entries
-      if (hash_table[h] && stbi__sbn(hash_table[h]) == 2*quality) {
+      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__sbn(hash_table[h]) = quality;
+         stbiw__sbn(hash_table[h]) = quality;
       }
-      stbi__sbpush(hash_table[h],data+i);
+      stbiw__sbpush(hash_table[h],data+i);
 
       if (bestloc) {
          // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal
-         h = stbi__zhash(data+i+1)&(stbi__ZHASH-1);
+         h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1);
          hlist = hash_table[h];
-         n = stbi__sbcount(hlist);
+         n = stbiw__sbcount(hlist);
          for (j=0; j < n; ++j) {
             if (hlist[j]-data > i-32767) {
-               int e = stbi__zlib_countm(hlist[j], data+i+1, data_len-i-1);
+               int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1);
                if (e > best) { // if next match is better, bail on current match
                   bestloc = NULL;
                   break;
@@ -319,30 +320,30 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
       }
 
       if (bestloc) {
-         int d = data+i - bestloc; // distance back
+         int d = (int) (data+i - bestloc); // distance back
          assert(d <= 32767 && best <= 258);
          for (j=0; best > lengthc[j+1]-1; ++j);
-         stbi__zlib_huff(j+257);
-         if (lengtheb[j]) stbi__zlib_add(best - lengthc[j], lengtheb[j]);
+         stbiw__zlib_huff(j+257);
+         if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
          for (j=0; d > distc[j+1]-1; ++j);
-         stbi__zlib_add(stbi__zlib_bitrev(j,5),5);
-         if (disteb[j]) stbi__zlib_add(d - distc[j], disteb[j]);
+         stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5);
+         if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]);
          i += best;
       } else {
-         stbi__zlib_huffb(data[i]);
+         stbiw__zlib_huffb(data[i]);
          ++i;
       }
    }
    // write out final bytes
    for (;i < data_len; ++i)
-      stbi__zlib_huffb(data[i]);
-   stbi__zlib_huff(256); // end of block
+      stbiw__zlib_huffb(data[i]);
+   stbiw__zlib_huff(256); // end of block
    // pad with 0 bits to byte boundary
    while (bitcount)
-      stbi__zlib_add(0,1);
+      stbiw__zlib_add(0,1);
 
-   for (i=0; i < stbi__ZHASH; ++i)
-      (void) stbi__sbfree(hash_table[i]);
+   for (i=0; i < stbiw__ZHASH; ++i)
+      (void) stbiw__sbfree(hash_table[i]);
 
    {
       // compute adler32 on input
@@ -354,18 +355,18 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
          j += blocklen;
          blocklen = 5552;
       }
-      stbi__sbpush(out, (unsigned char) (s2 >> 8));
-      stbi__sbpush(out, (unsigned char) s2);
-      stbi__sbpush(out, (unsigned char) (s1 >> 8));
-      stbi__sbpush(out, (unsigned char) s1);
+      stbiw__sbpush(out, (unsigned char) (s2 >> 8));
+      stbiw__sbpush(out, (unsigned char) s2);
+      stbiw__sbpush(out, (unsigned char) (s1 >> 8));
+      stbiw__sbpush(out, (unsigned char) s1);
    }
-   *out_len = stbi__sbn(out);
+   *out_len = stbiw__sbn(out);
    // make returned pointer freeable
-   memmove(stbi__sbraw(out), out, *out_len);
-   return (unsigned char *) stbi__sbraw(out);
+   memmove(stbiw__sbraw(out), out, *out_len);
+   return (unsigned char *) stbiw__sbraw(out);
 }
 
-unsigned int stbi__crc32(unsigned char *buffer, int len)
+unsigned int stbiw__crc32(unsigned char *buffer, int len)
 {
    static unsigned int crc_table[256];
    unsigned int crc = ~0u;
@@ -379,17 +380,17 @@ unsigned int stbi__crc32(unsigned char *buffer, int len)
    return ~crc;
 }
 
-#define stbi__wpng4(o,a,b,c,d) ((o)[0]=(unsigned char)(a),(o)[1]=(unsigned char)(b),(o)[2]=(unsigned char)(c),(o)[3]=(unsigned char)(d),(o)+=4)
-#define stbi__wp32(data,v) stbi__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v));
-#define stbi__wptag(data,s) stbi__wpng4(data, s[0],s[1],s[2],s[3])
+#define stbiw__wpng4(o,a,b,c,d) ((o)[0]=(unsigned char)(a),(o)[1]=(unsigned char)(b),(o)[2]=(unsigned char)(c),(o)[3]=(unsigned char)(d),(o)+=4)
+#define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v));
+#define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3])
 
-static void stbi__wpcrc(unsigned char **data, int len)
+static void stbiw__wpcrc(unsigned char **data, int len)
 {
-   unsigned int crc = stbi__crc32(*data - len - 4, len+4);
-   stbi__wp32(*data, crc);
+   unsigned int crc = stbiw__crc32(*data - len - 4, len+4);
+   stbiw__wp32(*data, crc);
 }
 
-static unsigned char stbi__paeth(int a, int b, int c)
+static unsigned char stbiw__paeth(int a, int b, int c)
 {
    int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c);
    if (pa <= pb && pa <= pc) return (unsigned char) a;
@@ -425,7 +426,7 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
                   case 1: line_buffer[i] = z[i]; break;
                   case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
                   case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break;
-                  case 4: line_buffer[i] = (signed char) (z[i] - stbi__paeth(0,z[i-stride_bytes],0)); break;
+                  case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break;
                   case 5: line_buffer[i] = z[i]; break;
                   case 6: line_buffer[i] = z[i]; break;
                }
@@ -435,9 +436,9 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
                   case 1: line_buffer[i] = z[i] - z[i-n]; break;
                   case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
                   case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break;
-                  case 4: line_buffer[i] = z[i] - stbi__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
+                  case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
                   case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break;
-                  case 6: line_buffer[i] = z[i] - stbi__paeth(z[i-n], 0,0); break;
+                  case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break;
                }
             }
             if (p) break;
@@ -462,25 +463,25 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in
 
    o=out;
    memcpy(o,sig,8); o+= 8;
-   stbi__wp32(o, 13); // header length
-   stbi__wptag(o, "IHDR");
-   stbi__wp32(o, x);
-   stbi__wp32(o, y);
+   stbiw__wp32(o, 13); // header length
+   stbiw__wptag(o, "IHDR");
+   stbiw__wp32(o, x);
+   stbiw__wp32(o, y);
    *o++ = 8;
    *o++ = (unsigned char) ctype[n];
    *o++ = 0;
    *o++ = 0;
    *o++ = 0;
-   stbi__wpcrc(&o,13);
+   stbiw__wpcrc(&o,13);
 
-   stbi__wp32(o, zlen);
-   stbi__wptag(o, "IDAT");
+   stbiw__wp32(o, zlen);
+   stbiw__wptag(o, "IDAT");
    memcpy(o, zlib, zlen); o += zlen; free(zlib);
-   stbi__wpcrc(&o, zlen);
+   stbiw__wpcrc(&o, zlen);
 
-   stbi__wp32(o,0);
-   stbi__wptag(o, "IEND");
-   stbi__wpcrc(&o,0);
+   stbiw__wp32(o,0);
+   stbiw__wptag(o, "IEND");
+   stbiw__wpcrc(&o,0);
 
    assert(o == out + *out_len);
 
@@ -504,6 +505,10 @@ int stbi_write_png(char const *filename, int x, int y, int comp, const void *dat
 
 /* Revision history
 
+      0.94 (2014-05-31)
+             rename private functions to avoid conflicts with stb_image.h
+      0.93 (2014-05-27)
+             warning fixes
       0.92 (2010-08-01)
              casts to unsigned char to fix warnings
       0.91 (2010-07-17)