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Merge 5807e28456 into 423298e071

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gasparitiago 2017-07-17 13:29:42 +00:00 committed by GitHub
commit 13462f1b2e
1 changed files with 41 additions and 3 deletions

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stb_image_write.h
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@ -1,5 +1,5 @@
/* stb_image_write - v1.05 - public domain - http://nothings.org/stb/stb_image_write.h
writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010-2015
writes out PNG/BMP/TGA/PGM images to C stdio - Sean Barrett 2010-2015
no warranty implied; use at your own risk
Before #including,
@ -29,20 +29,22 @@ BUILDING:
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_pgm(char const *filename, int w, int h, const unsigned char *data);
There are also four equivalent functions that use an arbitrary write function. You are
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);
int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
int stbi_write_pgm_to_func(stbi_write_func *func, void *context, int w, int h, const unsigned char *data);
where the callback is:
void stbi_write_func(void *context, void *data, int size);
@ -80,10 +82,15 @@ USAGE:
TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed
data, set the global variable 'stbi_write_tga_with_rle' to 0.
PGM supports only 8-bit grayscale images so the 'comp' parameter is not used.
The PGM format expects linear unsigned char data.
CREDITS:
PNG/BMP/TGA
Sean Barrett
PGM
Tiago De Gaspari
HDR
Baldur Karlsson
TGA monochrome:
@ -131,6 +138,7 @@ STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const
STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
STBIWDEF int stbi_write_pgm(char const *filename, int w, int h, const unsigned char *data);
#endif
typedef void stbi_write_func(void *context, void *data, int size);
@ -139,6 +147,7 @@ STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w,
STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
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_pgm_to_func(stbi_write_func *func, void *context, int w, int h, const unsigned char *data);
#ifdef __cplusplus
}
@ -1013,6 +1022,35 @@ STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x,
return 1;
}
//////////////////////////////////////////////////////////////////////////////
//
// PGM writer
// by Tiago De Gaspari
#ifndef STBI_WRITE_NO_STDIO
STBIWDEF int stbi_write_pgm(char const *filename, int x, int y, const unsigned char *data)
{
FILE *f;
int len = x * y;
int maxValue = 255;
if (data == NULL) return 0;
f = fopen(filename, "wb");
if (!f) { return 0; }
fprintf(f, "P5\n%d %d\n%d\n", x, y, maxValue);
fwrite(data, 1, len, f);
fclose(f);
return 1;
}
#endif
STBIWDEF int stbi_write_pgm_to_func(stbi_write_func *func, void *context, int x, int y, const unsigned char *data)
{
int len = x * y;
if (data == NULL) return 0;
func(context, const_cast<unsigned char*>(data), len);
return 1;
}
#endif // STB_IMAGE_WRITE_IMPLEMENTATION
/* Revision history