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Update C sources, add new functions

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This commit is contained in:
Milan Nikolic 2018-05-06 09:34:11 +02:00
parent e6a1abb290
commit a6d36a3699
98 changed files with 7964 additions and 2985 deletions
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243
raylib/external/stb_image_write.h vendored
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@ -1,4 +1,4 @@
/* stb_image_write - v1.07 - public domain - http://nothings.org/stb/stb_image_write.h
/* stb_image_write - v1.08 - 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
@ -10,34 +10,47 @@
Will probably not work correctly with strict-aliasing optimizations.
If using a modern Microsoft Compiler, non-safe versions of CRT calls may cause
compilation warnings or even errors. To avoid this, also before #including,
#define STBI_MSC_SECURE_CRT
ABOUT:
This header file is a library for writing images to C stdio. It could be
adapted to write to memory or a general streaming interface; let me know.
The PNG output is not optimal; it is 20-50% larger than the file
written by a decent optimizing implementation. This library is designed
for source code compactness and simplicity, not optimal image file size
or run-time performance.
written by a decent optimizing implementation; though providing a custom
zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that.
This library is designed for source code compactness and simplicity,
not optimal image file size or run-time performance.
BUILDING:
You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h.
You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace
malloc,realloc,free.
You can define STBIW_MEMMOVE() to replace memmove()
You can #define STBIW_MEMMOVE() to replace memmove()
You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function
for PNG compression (instead of the builtin one), it must have the following signature:
unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality);
The returned data will be freed with STBIW_FREE() (free() by default),
so it must be heap allocated with STBIW_MALLOC() (malloc() by default),
USAGE:
There are four functions, one for each image file format:
There are five functions, one for each image file format:
int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
int stbi_write_jpg(char const *filename, int w, int h, int comp, const float *data);
int stbi_write_jpg(char const *filename, int w, int h, int comp, const float *data, int quality);
There are also four equivalent functions that use an arbitrary write function. You are
void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically
There are also five equivalent functions that use an arbitrary write function. You are
expected to open/close your file-equivalent before and after calling these:
int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes);
@ -49,6 +62,12 @@ USAGE:
where the callback is:
void stbi_write_func(void *context, void *data, int size);
You can configure it with these global variables:
int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE
int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression
int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode
You can define STBI_WRITE_NO_STDIO to disable the file variant of these
functions, so the library will not use stdio.h at all. However, this will
also disable HDR writing, because it requires stdio for formatted output.
@ -75,6 +94,9 @@ USAGE:
writer, both because it is in BGR order and because it may have padding
at the end of the line.)
PNG allows you to set the deflate compression level by setting the global
variable 'stbi_write_png_level' (it defaults to 8).
HDR expects linear float data. Since the format is always 32-bit rgb(e)
data, alpha (if provided) is discarded, and for monochrome data it is
replicated across all three channels.
@ -88,21 +110,17 @@ USAGE:
CREDITS:
PNG/BMP/TGA
Sean Barrett
HDR
Baldur Karlsson
TGA monochrome:
Jean-Sebastien Guay
misc enhancements:
Tim Kelsey
TGA RLE
Alan Hickman
initial file IO callback implementation
Emmanuel Julien
JPEG
Jon Olick (original jo_jpeg.cpp code)
Daniel Gibson
Sean Barrett - PNG/BMP/TGA
Baldur Karlsson - HDR
Jean-Sebastien Guay - TGA monochrome
Tim Kelsey - misc enhancements
Alan Hickman - TGA RLE
Emmanuel Julien - initial file IO callback implementation
Jon Olick - original jo_jpeg.cpp code
Daniel Gibson - integrate JPEG, allow external zlib
Aarni Koskela - allow choosing PNG filter
bugfixes:
github:Chribba
Guillaume Chereau
@ -114,6 +132,7 @@ CREDITS:
Thatcher Ulrich
github:poppolopoppo
Patrick Boettcher
github:xeekworx
LICENSE
@ -132,9 +151,12 @@ extern "C" {
#define STBIWDEF static
#else
#define STBIWDEF extern
extern int stbi_write_tga_with_rle;
#endif
STBIWDEF int stbi_write_tga_with_rle;
STBIWDEF int stbi_write_png_comperssion_level;
STBIWDEF int stbi_write_force_png_filter;
#ifndef STBI_WRITE_NO_STDIO
STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
@ -151,6 +173,8 @@ STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w,
STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality);
STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
#ifdef __cplusplus
}
#endif
@ -208,6 +232,23 @@ STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x,
#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff)
#ifdef STB_IMAGE_WRITE_STATIC
static stbi__flip_vertically_on_write=0;
static int stbi_write_png_compression level = 8;
static int stbi_write_tga_with_rle = 1;
static int stbi_write_force_png_filter = -1;
#else
int stbi_write_png_compression_level = 8;
int stbi__flip_vertically_on_write=0;
int stbi_write_tga_with_rle = 1;
int stbi_write_force_png_filter = -1;
#endif
STBIWDEF void stbi_flip_vertically_on_write(int flag)
{
stbi__flip_vertically_on_write = flag;
}
typedef struct
{
stbi_write_func *func;
@ -230,7 +271,13 @@ static void stbi__stdio_write(void *context, void *data, int size)
static int stbi__start_write_file(stbi__write_context *s, const char *filename)
{
FILE *f = fopen(filename, "wb");
FILE *f;
#ifdef STBI_MSC_SECURE_CRT
if (fopen_s(&f, filename, "wb"))
f = NULL;
#else
f = fopen(filename, "wb");
#endif
stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f);
return f != NULL;
}
@ -245,12 +292,6 @@ static void stbi__end_write_file(stbi__write_context *s)
typedef unsigned int stbiw_uint32;
typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
#ifdef STB_IMAGE_WRITE_STATIC
static int stbi_write_tga_with_rle = 1;
#else
int stbi_write_tga_with_rle = 1;
#endif
static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v)
{
while (*fmt) {
@ -341,6 +382,9 @@ static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, i
if (y <= 0)
return;
if (stbi__flip_vertically_on_write)
vdir *= -1;
if (vdir < 0)
j_end = -1, j = y-1;
else
@ -412,11 +456,21 @@ static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, v
"111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8);
} else {
int i,j,k;
int jend, jdir;
stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8);
for (j = y - 1; j >= 0; --j) {
unsigned char *row = (unsigned char *) data + j * x * comp;
if (stbi__flip_vertically_on_write) {
j = 0;
jend = y;
jdir = 1;
} else {
j = y-1;
jend = -1;
jdir = -1;
}
for (; j != jend; j += jdir) {
unsigned char *row = (unsigned char *) data + j * x * comp;
int len;
for (i = 0; i < x; i += len) {
@ -626,11 +680,15 @@ static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, f
char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n";
s->func(s->context, header, sizeof(header)-1);
#ifdef STBI_MSC_SECURE_CRT
len = sprintf_s(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
#else
len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
#endif
s->func(s->context, buffer, len);
for(i=0; i < y; i++)
stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*i*x);
stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i)*x);
STBIW_FREE(scratch);
return 1;
}
@ -662,6 +720,7 @@ STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const
// PNG writer
//
#ifndef STBIW_ZLIB_COMPRESS
// 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]
@ -742,8 +801,14 @@ static unsigned int stbiw__zhash(unsigned char *data)
#define stbiw__ZHASH 16384
#endif // STBIW_ZLIB_COMPRESS
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 builtin
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 +817,8 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
int i,j, bitcount=0;
unsigned char *out = NULL;
unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(char**));
if (hash_table == NULL)
return NULL;
if (quality < 5) quality = 5;
stbiw__sbpush(out, 0x78); // DEFLATE 32K window
@ -845,6 +912,7 @@ 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)
@ -911,61 +979,87 @@ static unsigned char stbiw__paeth(int a, int b, int c)
}
// @OPTIMIZE: provide an option that always forces left-predict or paeth predict
static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int width, int height, int y, int n, int filter_type, signed char *line_buffer)
{
static int mapping[] = { 0,1,2,3,4 };
static int firstmap[] = { 0,1,0,5,6 };
int *mymap = (y != 0) ? mapping : firstmap;
int i;
int type = mymap[filter_type];
unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y);
for (i = 0; i < n; ++i) {
switch (type) {
case 0: line_buffer[i] = z[i]; break;
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] - 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;
}
}
for (i=n; i < width*n; ++i) {
switch (type) {
case 0: line_buffer[i] = z[i]; break;
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] - 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] - stbiw__paeth(z[i-n], 0,0); break;
}
}
}
unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len)
{
int force_filter = stbi_write_force_png_filter;
int ctype[5] = { -1, 0, 4, 2, 6 };
unsigned char sig[8] = { 137,80,78,71,13,10,26,10 };
unsigned char *out,*o, *filt, *zlib;
signed char *line_buffer;
int i,j,k,p,zlen;
int j,zlen;
if (stride_bytes == 0)
stride_bytes = x * n;
if (force_filter >= 5) {
force_filter = -1;
}
filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0;
line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_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 };
int *mymap = (j != 0) ? mapping : firstmap;
int best = 0, bestval = 0x7fffffff;
for (p=0; p < 2; ++p) {
for (k= p?best:0; k < 5; ++k) { // @TODO: clarity: rewrite this to go 0..5, and 'continue' the unwanted ones during 2nd pass
int type = mymap[k],est=0;
unsigned char *z = pixels + stride_bytes*j;
for (i=0; i < n; ++i)
switch (type) {
case 0: line_buffer[i] = z[i]; break;
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] - 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;
}
for (i=n; i < x*n; ++i) {
switch (type) {
case 0: line_buffer[i] = z[i]; break;
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] - 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] - stbiw__paeth(z[i-n], 0,0); break;
}
}
if (p) break;
for (i=0; i < x*n; ++i)
int filter_type;
if (force_filter > -1) {
filter_type = force_filter;
stbiw__encode_png_line(pixels, stride_bytes, x, y, j, n, force_filter, line_buffer);
} else { // Estimate the best filter by running through all of them:
int best_filter = 0, best_filter_val = 0x7fffffff, est, i;
for (filter_type = 0; filter_type < 5; filter_type++) {
stbiw__encode_png_line(pixels, stride_bytes, x, y, j, n, filter_type, line_buffer);
// Estimate the entropy of the line using this filter; the less, the better.
est = 0;
for (i = 0; i < x*n; ++i) {
est += abs((signed char) line_buffer[i]);
if (est < bestval) { bestval = est; best = k; }
}
if (est < best_filter_val) {
best_filter_val = est;
best_filter = filter_type;
}
}
if (filter_type != best_filter) { // If the last iteration already got us the best filter, don't redo it
stbiw__encode_png_line(pixels, stride_bytes, x, y, j, n, best_filter, line_buffer);
filter_type = best_filter;
}
}
// when we get here, best contains the filter type, and line_buffer contains the data
filt[j*(x*n+1)] = (unsigned char) best;
// when we get here, filter_type contains the filter type, and line_buffer contains the data
filt[j*(x*n+1)] = (unsigned char) filter_type;
STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n);
}
STBIW_FREE(line_buffer);
zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory
zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level);
STBIW_FREE(filt);
if (!zlib) return 0;
@ -1010,7 +1104,12 @@ STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const
int len;
unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len);
if (png == NULL) return 0;
#ifdef STBI_MSC_SECURE_CRT
if (fopen_s(&f, filename, "wb"))
f = NULL;
#else
f = fopen(filename, "wb");
#endif
if (!f) { STBIW_FREE(png); return 0; }
fwrite(png, 1, len, f);
fclose(f);
@ -1318,7 +1417,7 @@ static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, in
float YDU[64], UDU[64], VDU[64];
for(row = y, pos = 0; row < y+8; ++row) {
for(col = x; col < x+8; ++col, ++pos) {
int p = row*width*comp + col*comp;
int p = (stbi__flip_vertically_on_write ? height-1-row : row)*width*comp + col*comp;
float r, g, b;
if(row >= height) {
p -= width*comp*(row+1 - height);
@ -1377,6 +1476,8 @@ STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const
#endif // STB_IMAGE_WRITE_IMPLEMENTATION
/* Revision history
1.08 (2018-01-29)
add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter
1.07 (2017-07-24)
doc fix
1.06 (2017-07-23)