| | |
| | | /* 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 |
| | | |
| | | /* stb_image_write - v1.07 - 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 |
| | | |
| | | Before #including, |
| | | |
| | |
| | | |
| | | 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 simplicitly, not optimal image file size |
| | | for source code compactness and simplicity, not optimal image file size |
| | | or run-time performance. |
| | | |
| | | BUILDING: |
| | |
| | | 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 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); |
| | | |
| | | There are also four 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_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); |
| | | |
| | | where the callback is: |
| | | void stbi_write_func(void *context, void *data, int size); |
| | | |
| | | 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. |
| | | |
| | | Each function returns 0 on failure and non-0 on success. |
| | | |
| | |
| | | data, alpha (if provided) is discarded, and for monochrome data it is |
| | | replicated across all three channels. |
| | | |
| | | 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. |
| | | |
| | | JPEG does ignore alpha channels in input data; quality is between 1 and 100. |
| | | Higher quality looks better but results in a bigger image. |
| | | JPEG baseline (no JPEG progressive). |
| | | |
| | | CREDITS: |
| | | |
| | | PNG/BMP/TGA |
| | |
| | | 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 |
| | | bugfixes: |
| | | github:Chribba |
| | | Guillaume Chereau |
| | | github:jry2 |
| | | github:romigrou |
| | | Sergio Gonzalez |
| | | Jonas Karlsson |
| | | Filip Wasil |
| | | Thatcher Ulrich |
| | | github:poppolopoppo |
| | | Patrick Boettcher |
| | | |
| | | LICENSE |
| | | |
| | | See end of file for license information. |
| | | |
| | | */ |
| | | |
| | | #ifndef INCLUDE_STB_IMAGE_WRITE_H |
| | |
| | | extern "C" { |
| | | #endif |
| | | |
| | | 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); |
| | | extern int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); |
| | | #ifdef STB_IMAGE_WRITE_STATIC |
| | | #define STBIWDEF static |
| | | #else |
| | | #define STBIWDEF extern |
| | | extern int stbi_write_tga_with_rle; |
| | | #endif |
| | | |
| | | #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); |
| | | 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_jpg(char const *filename, int x, int y, int comp, const void *data, int quality); |
| | | #endif |
| | | |
| | | typedef void stbi_write_func(void *context, void *data, int size); |
| | | |
| | | STBIWDEF 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); |
| | | 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_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); |
| | | |
| | | #ifdef __cplusplus |
| | | } |
| | |
| | | |
| | | #ifdef STB_IMAGE_WRITE_IMPLEMENTATION |
| | | |
| | | #ifdef _WIN32 |
| | | #ifndef _CRT_SECURE_NO_WARNINGS |
| | | #define _CRT_SECURE_NO_WARNINGS |
| | | #endif |
| | | #ifndef _CRT_NONSTDC_NO_DEPRECATE |
| | | #define _CRT_NONSTDC_NO_DEPRECATE |
| | | #endif |
| | | #endif |
| | | |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | #include <stdio.h> |
| | | #endif // STBI_WRITE_NO_STDIO |
| | | |
| | | #include <stdarg.h> |
| | | #include <stdlib.h> |
| | | #include <stdio.h> |
| | | #include <string.h> |
| | | #include <math.h> |
| | | |
| | | #if defined(STBIW_MALLOC) && defined(STBIW_FREE) && defined(STBIW_REALLOC) |
| | | #if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) |
| | | // ok |
| | | #elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) |
| | | #elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) |
| | | // ok |
| | | #else |
| | | #error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC." |
| | | #error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." |
| | | #endif |
| | | |
| | | #ifndef STBIW_MALLOC |
| | | #define STBIW_MALLOC(sz) malloc(sz) |
| | | #define STBIW_REALLOC(p,sz) realloc(p,sz) |
| | | #define STBIW_FREE(p) free(p) |
| | | #define STBIW_MALLOC(sz) malloc(sz) |
| | | #define STBIW_REALLOC(p,newsz) realloc(p,newsz) |
| | | #define STBIW_FREE(p) free(p) |
| | | #endif |
| | | |
| | | #ifndef STBIW_REALLOC_SIZED |
| | | #define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) |
| | | #endif |
| | | |
| | | |
| | | #ifndef STBIW_MEMMOVE |
| | | #define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) |
| | | #endif |
| | |
| | | #define STBIW_ASSERT(x) assert(x) |
| | | #endif |
| | | |
| | | #define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) |
| | | |
| | | typedef struct |
| | | { |
| | | stbi_write_func *func; |
| | | void *context; |
| | | } stbi__write_context; |
| | | |
| | | // initialize a callback-based context |
| | | static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) |
| | | { |
| | | s->func = c; |
| | | s->context = context; |
| | | } |
| | | |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | |
| | | static void stbi__stdio_write(void *context, void *data, int size) |
| | | { |
| | | fwrite(data,1,size,(FILE*) context); |
| | | } |
| | | |
| | | static int stbi__start_write_file(stbi__write_context *s, const char *filename) |
| | | { |
| | | FILE *f = fopen(filename, "wb"); |
| | | stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); |
| | | return f != NULL; |
| | | } |
| | | |
| | | static void stbi__end_write_file(stbi__write_context *s) |
| | | { |
| | | fclose((FILE *)s->context); |
| | | } |
| | | |
| | | #endif // !STBI_WRITE_NO_STDIO |
| | | |
| | | typedef unsigned int stbiw_uint32; |
| | | typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; |
| | | |
| | | static void writefv(FILE *f, const char *fmt, va_list v) |
| | | #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) { |
| | | switch (*fmt++) { |
| | | case ' ': break; |
| | | case '1': { unsigned char x = (unsigned char) va_arg(v, int); fputc(x,f); break; } |
| | | case '2': { int x = va_arg(v,int); unsigned char b[2]; |
| | | b[0] = (unsigned char) x; b[1] = (unsigned char) (x>>8); |
| | | fwrite(b,2,1,f); break; } |
| | | case '4': { stbiw_uint32 x = va_arg(v,int); unsigned char b[4]; |
| | | b[0]=(unsigned char)x; b[1]=(unsigned char)(x>>8); |
| | | b[2]=(unsigned char)(x>>16); b[3]=(unsigned char)(x>>24); |
| | | fwrite(b,4,1,f); break; } |
| | | case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); |
| | | s->func(s->context,&x,1); |
| | | break; } |
| | | case '2': { int x = va_arg(v,int); |
| | | unsigned char b[2]; |
| | | b[0] = STBIW_UCHAR(x); |
| | | b[1] = STBIW_UCHAR(x>>8); |
| | | s->func(s->context,b,2); |
| | | break; } |
| | | case '4': { stbiw_uint32 x = va_arg(v,int); |
| | | unsigned char b[4]; |
| | | b[0]=STBIW_UCHAR(x); |
| | | b[1]=STBIW_UCHAR(x>>8); |
| | | b[2]=STBIW_UCHAR(x>>16); |
| | | b[3]=STBIW_UCHAR(x>>24); |
| | | s->func(s->context,b,4); |
| | | break; } |
| | | default: |
| | | STBIW_ASSERT(0); |
| | | return; |
| | |
| | | } |
| | | } |
| | | |
| | | static void write3(FILE *f, unsigned char a, unsigned char b, unsigned char c) |
| | | static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) |
| | | { |
| | | va_list v; |
| | | va_start(v, fmt); |
| | | stbiw__writefv(s, fmt, v); |
| | | va_end(v); |
| | | } |
| | | |
| | | static void stbiw__putc(stbi__write_context *s, unsigned char c) |
| | | { |
| | | s->func(s->context, &c, 1); |
| | | } |
| | | |
| | | static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) |
| | | { |
| | | unsigned char arr[3]; |
| | | arr[0] = a, arr[1] = b, arr[2] = c; |
| | | fwrite(arr, 3, 1, f); |
| | | s->func(s->context, arr, 3); |
| | | } |
| | | |
| | | static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono) |
| | | static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) |
| | | { |
| | | unsigned char bg[3] = { 255, 0, 255}, px[3]; |
| | | int k; |
| | | |
| | | if (write_alpha < 0) |
| | | s->func(s->context, &d[comp - 1], 1); |
| | | |
| | | switch (comp) { |
| | | case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case |
| | | case 1: |
| | | if (expand_mono) |
| | | stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp |
| | | else |
| | | s->func(s->context, d, 1); // monochrome TGA |
| | | break; |
| | | case 4: |
| | | if (!write_alpha) { |
| | | // composite against pink background |
| | | for (k = 0; k < 3; ++k) |
| | | px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; |
| | | stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); |
| | | break; |
| | | } |
| | | /* FALLTHROUGH */ |
| | | case 3: |
| | | stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); |
| | | break; |
| | | } |
| | | if (write_alpha > 0) |
| | | s->func(s->context, &d[comp - 1], 1); |
| | | } |
| | | |
| | | static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono) |
| | | { |
| | | stbiw_uint32 zero = 0; |
| | | int i,j,k, j_end; |
| | | int i,j, j_end; |
| | | |
| | | if (y <= 0) |
| | | return; |
| | |
| | | for (; j != j_end; j += vdir) { |
| | | for (i=0; i < x; ++i) { |
| | | unsigned char *d = (unsigned char *) data + (j*x+i)*comp; |
| | | if (write_alpha < 0) |
| | | fwrite(&d[comp-1], 1, 1, f); |
| | | switch (comp) { |
| | | case 1: fwrite(d, 1, 1, f); |
| | | break; |
| | | case 2: if (expand_mono) |
| | | write3(f, d[0],d[0],d[0]); // monochrome bmp |
| | | else |
| | | fwrite(d, 1, 1, f); // monochrome TGA |
| | | break; |
| | | case 4: |
| | | if (!write_alpha) { |
| | | // composite against pink background |
| | | for (k=0; k < 3; ++k) |
| | | px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255; |
| | | write3(f, px[1-rgb_dir],px[1],px[1+rgb_dir]); |
| | | break; |
| | | } |
| | | /* FALLTHROUGH */ |
| | | case 3: |
| | | write3(f, d[1-rgb_dir],d[1],d[1+rgb_dir]); |
| | | break; |
| | | } |
| | | if (write_alpha > 0) |
| | | fwrite(&d[comp-1], 1, 1, f); |
| | | stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); |
| | | } |
| | | fwrite(&zero,scanline_pad,1,f); |
| | | s->func(s->context, &zero, scanline_pad); |
| | | } |
| | | } |
| | | |
| | | static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...) |
| | | static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...) |
| | | { |
| | | FILE *f; |
| | | if (y < 0 || x < 0) return 0; |
| | | f = fopen(filename, "wb"); |
| | | if (f) { |
| | | if (y < 0 || x < 0) { |
| | | return 0; |
| | | } else { |
| | | va_list v; |
| | | va_start(v, fmt); |
| | | writefv(f, fmt, v); |
| | | stbiw__writefv(s, fmt, v); |
| | | va_end(v); |
| | | write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad,expand_mono); |
| | | fclose(f); |
| | | stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); |
| | | return 1; |
| | | } |
| | | return f != NULL; |
| | | } |
| | | |
| | | int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) |
| | | static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) |
| | | { |
| | | int pad = (-x*3) & 3; |
| | | return outfile(filename,-1,-1,x,y,comp,1,(void *) data,0,pad, |
| | | return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, |
| | | "11 4 22 4" "4 44 22 444444", |
| | | 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header |
| | | 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header |
| | | } |
| | | |
| | | int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) |
| | | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) |
| | | { |
| | | stbi__write_context s; |
| | | stbi__start_write_callbacks(&s, func, context); |
| | | return stbi_write_bmp_core(&s, x, y, comp, data); |
| | | } |
| | | |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) |
| | | { |
| | | stbi__write_context s; |
| | | if (stbi__start_write_file(&s,filename)) { |
| | | int r = stbi_write_bmp_core(&s, x, y, comp, data); |
| | | stbi__end_write_file(&s); |
| | | return r; |
| | | } else |
| | | return 0; |
| | | } |
| | | #endif //!STBI_WRITE_NO_STDIO |
| | | |
| | | static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) |
| | | { |
| | | int has_alpha = (comp == 2 || comp == 4); |
| | | int colorbytes = has_alpha ? comp-1 : comp; |
| | | int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 |
| | | return outfile(filename, -1,-1, x, y, comp, 0, (void *) data, has_alpha, 0, |
| | | "111 221 2222 11", 0,0,format, 0,0,0, 0,0,x,y, (colorbytes+has_alpha)*8, has_alpha*8); |
| | | |
| | | if (y < 0 || x < 0) |
| | | return 0; |
| | | |
| | | if (!stbi_write_tga_with_rle) { |
| | | return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, |
| | | "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; |
| | | |
| | | 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; |
| | | int len; |
| | | |
| | | for (i = 0; i < x; i += len) { |
| | | unsigned char *begin = row + i * comp; |
| | | int diff = 1; |
| | | len = 1; |
| | | |
| | | if (i < x - 1) { |
| | | ++len; |
| | | diff = memcmp(begin, row + (i + 1) * comp, comp); |
| | | if (diff) { |
| | | const unsigned char *prev = begin; |
| | | for (k = i + 2; k < x && len < 128; ++k) { |
| | | if (memcmp(prev, row + k * comp, comp)) { |
| | | prev += comp; |
| | | ++len; |
| | | } else { |
| | | --len; |
| | | break; |
| | | } |
| | | } |
| | | } else { |
| | | for (k = i + 2; k < x && len < 128; ++k) { |
| | | if (!memcmp(begin, row + k * comp, comp)) { |
| | | ++len; |
| | | } else { |
| | | break; |
| | | } |
| | | } |
| | | } |
| | | } |
| | | |
| | | if (diff) { |
| | | unsigned char header = STBIW_UCHAR(len - 1); |
| | | s->func(s->context, &header, 1); |
| | | for (k = 0; k < len; ++k) { |
| | | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); |
| | | } |
| | | } else { |
| | | unsigned char header = STBIW_UCHAR(len - 129); |
| | | s->func(s->context, &header, 1); |
| | | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); |
| | | } |
| | | } |
| | | } |
| | | } |
| | | return 1; |
| | | } |
| | | |
| | | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) |
| | | { |
| | | stbi__write_context s; |
| | | stbi__start_write_callbacks(&s, func, context); |
| | | return stbi_write_tga_core(&s, x, y, comp, (void *) data); |
| | | } |
| | | |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) |
| | | { |
| | | stbi__write_context s; |
| | | if (stbi__start_write_file(&s,filename)) { |
| | | int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); |
| | | stbi__end_write_file(&s); |
| | | return r; |
| | | } else |
| | | return 0; |
| | | } |
| | | #endif |
| | | |
| | | // ************************************************************************************************* |
| | | // Radiance RGBE HDR writer |
| | | // by Baldur Karlsson |
| | | |
| | | #define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) |
| | | |
| | | void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) |
| | |
| | | int exponent; |
| | | float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); |
| | | |
| | | if (maxcomp < 1e-32) { |
| | | if (maxcomp < 1e-32f) { |
| | | rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; |
| | | } else { |
| | | float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; |
| | |
| | | } |
| | | } |
| | | |
| | | void stbiw__write_run_data(FILE *f, int length, unsigned char databyte) |
| | | void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) |
| | | { |
| | | unsigned char lengthbyte = (unsigned char) (length+128); |
| | | unsigned char lengthbyte = STBIW_UCHAR(length+128); |
| | | STBIW_ASSERT(length+128 <= 255); |
| | | fwrite(&lengthbyte, 1, 1, f); |
| | | fwrite(&databyte, 1, 1, f); |
| | | s->func(s->context, &lengthbyte, 1); |
| | | s->func(s->context, &databyte, 1); |
| | | } |
| | | |
| | | void stbiw__write_dump_data(FILE *f, int length, unsigned char *data) |
| | | void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) |
| | | { |
| | | unsigned char lengthbyte = (unsigned char )(length & 0xff); |
| | | unsigned char lengthbyte = STBIW_UCHAR(length); |
| | | STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code |
| | | fwrite(&lengthbyte, 1, 1, f); |
| | | fwrite(data, length, 1, f); |
| | | s->func(s->context, &lengthbyte, 1); |
| | | s->func(s->context, data, length); |
| | | } |
| | | |
| | | void stbiw__write_hdr_scanline(FILE *f, int width, int comp, unsigned char *scratch, const float *scanline) |
| | | void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) |
| | | { |
| | | unsigned char scanlineheader[4] = { 2, 2, 0, 0 }; |
| | | unsigned char rgbe[4]; |
| | |
| | | /* skip RLE for images too small or large */ |
| | | if (width < 8 || width >= 32768) { |
| | | for (x=0; x < width; x++) { |
| | | switch (comp) { |
| | | switch (ncomp) { |
| | | case 4: /* fallthrough */ |
| | | case 3: linear[2] = scanline[x*comp + 2]; |
| | | linear[1] = scanline[x*comp + 1]; |
| | | linear[0] = scanline[x*comp + 0]; |
| | | case 3: linear[2] = scanline[x*ncomp + 2]; |
| | | linear[1] = scanline[x*ncomp + 1]; |
| | | linear[0] = scanline[x*ncomp + 0]; |
| | | break; |
| | | case 2: /* fallthrough */ |
| | | case 1: linear[0] = linear[1] = linear[2] = scanline[x*comp + 0]; |
| | | default: |
| | | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; |
| | | break; |
| | | } |
| | | stbiw__linear_to_rgbe(rgbe, linear); |
| | | fwrite(rgbe, 4, 1, f); |
| | | s->func(s->context, rgbe, 4); |
| | | } |
| | | } else { |
| | | int c,r; |
| | | /* encode into scratch buffer */ |
| | | for (x=0; x < width; x++) { |
| | | switch(comp) { |
| | | switch(ncomp) { |
| | | case 4: /* fallthrough */ |
| | | case 3: linear[2] = scanline[x*comp + 2]; |
| | | linear[1] = scanline[x*comp + 1]; |
| | | linear[0] = scanline[x*comp + 0]; |
| | | case 3: linear[2] = scanline[x*ncomp + 2]; |
| | | linear[1] = scanline[x*ncomp + 1]; |
| | | linear[0] = scanline[x*ncomp + 0]; |
| | | break; |
| | | case 2: /* fallthrough */ |
| | | case 1: linear[0] = linear[1] = linear[2] = scanline[x*comp + 0]; |
| | | default: |
| | | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; |
| | | break; |
| | | } |
| | | stbiw__linear_to_rgbe(rgbe, linear); |
| | |
| | | scratch[x + width*3] = rgbe[3]; |
| | | } |
| | | |
| | | fwrite(scanlineheader, 4, 1, f); |
| | | s->func(s->context, scanlineheader, 4); |
| | | |
| | | /* RLE each component separately */ |
| | | for (c=0; c < 4; c++) { |
| | |
| | | while (x < r) { |
| | | int len = r-x; |
| | | if (len > 128) len = 128; |
| | | stbiw__write_dump_data(f, len, &comp[x]); |
| | | stbiw__write_dump_data(s, len, &comp[x]); |
| | | x += len; |
| | | } |
| | | // if there's a run, output it |
| | |
| | | while (x < r) { |
| | | int len = r-x; |
| | | if (len > 127) len = 127; |
| | | stbiw__write_run_data(f, len, comp[x]); |
| | | stbiw__write_run_data(s, len, comp[x]); |
| | | x += len; |
| | | } |
| | | } |
| | |
| | | } |
| | | } |
| | | |
| | | int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) |
| | | static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) |
| | | { |
| | | int i; |
| | | FILE *f; |
| | | if (y <= 0 || x <= 0 || data == NULL) return 0; |
| | | f = fopen(filename, "wb"); |
| | | if (f) { |
| | | /* Each component is stored separately. Allocate scratch space for full output scanline. */ |
| | | if (y <= 0 || x <= 0 || data == NULL) |
| | | return 0; |
| | | else { |
| | | // Each component is stored separately. Allocate scratch space for full output scanline. |
| | | unsigned char *scratch = (unsigned char *) STBIW_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); |
| | | int i, len; |
| | | char buffer[128]; |
| | | char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n"; |
| | | s->func(s->context, header, sizeof(header)-1); |
| | | |
| | | len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); |
| | | s->func(s->context, buffer, len); |
| | | |
| | | for(i=0; i < y; i++) |
| | | stbiw__write_hdr_scanline(f, x, comp, scratch, data + comp*i*x); |
| | | stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*i*x); |
| | | STBIW_FREE(scratch); |
| | | fclose(f); |
| | | return 1; |
| | | } |
| | | return f != NULL; |
| | | } |
| | | |
| | | ///////////////////////////////////////////////////////// |
| | | // PNG |
| | | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) |
| | | { |
| | | stbi__write_context s; |
| | | stbi__start_write_callbacks(&s, func, context); |
| | | return stbi_write_hdr_core(&s, x, y, comp, (float *) data); |
| | | } |
| | | |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) |
| | | { |
| | | stbi__write_context s; |
| | | if (stbi__start_write_file(&s,filename)) { |
| | | int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); |
| | | stbi__end_write_file(&s); |
| | | return r; |
| | | } else |
| | | return 0; |
| | | } |
| | | #endif // STBI_WRITE_NO_STDIO |
| | | |
| | | |
| | | ////////////////////////////////////////////////////////////////////////////// |
| | | // |
| | | // PNG writer |
| | | // |
| | | |
| | | // stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() |
| | | #define stbiw__sbraw(a) ((int *) (a) - 2) |
| | |
| | | static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) |
| | | { |
| | | int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; |
| | | void *p = STBIW_REALLOC(*arr ? stbiw__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2); |
| | | void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); |
| | | STBIW_ASSERT(p); |
| | | if (p) { |
| | | if (!*arr) ((int *) p)[1] = 0; |
| | |
| | | static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) |
| | | { |
| | | while (*bitcount >= 8) { |
| | | stbiw__sbpush(data, (unsigned char) *bitbuffer); |
| | | stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); |
| | | *bitbuffer >>= 8; |
| | | *bitcount -= 8; |
| | | } |
| | |
| | | unsigned int bitbuf=0; |
| | | int i,j, bitcount=0; |
| | | unsigned char *out = NULL; |
| | | unsigned char **hash_table[stbiw__ZHASH]; // 64KB on the stack! |
| | | unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(char**)); |
| | | if (quality < 5) quality = 5; |
| | | |
| | | stbiw__sbpush(out, 0x78); // DEFLATE 32K window |
| | |
| | | |
| | | for (i=0; i < stbiw__ZHASH; ++i) |
| | | (void) stbiw__sbfree(hash_table[i]); |
| | | STBIW_FREE(hash_table); |
| | | |
| | | { |
| | | // compute adler32 on input |
| | | unsigned int i=0, s1=1, s2=0, blocklen = data_len % 5552; |
| | | int j=0; |
| | | unsigned int s1=1, s2=0; |
| | | int blocklen = (int) (data_len % 5552); |
| | | j=0; |
| | | while (j < data_len) { |
| | | for (i=0; i < blocklen; ++i) s1 += data[j+i], s2 += s1; |
| | | s1 %= 65521, s2 %= 65521; |
| | | j += blocklen; |
| | | blocklen = 5552; |
| | | } |
| | | 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); |
| | | stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); |
| | | stbiw__sbpush(out, STBIW_UCHAR(s2)); |
| | | stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); |
| | | stbiw__sbpush(out, STBIW_UCHAR(s1)); |
| | | } |
| | | *out_len = stbiw__sbn(out); |
| | | // make returned pointer freeable |
| | |
| | | return (unsigned char *) stbiw__sbraw(out); |
| | | } |
| | | |
| | | unsigned int stbiw__crc32(unsigned char *buffer, int len) |
| | | static unsigned int stbiw__crc32(unsigned char *buffer, int len) |
| | | { |
| | | static unsigned int crc_table[256]; |
| | | static unsigned int crc_table[256] = |
| | | { |
| | | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, |
| | | 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, |
| | | 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, |
| | | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, |
| | | 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, |
| | | 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, |
| | | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, |
| | | 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, |
| | | 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, |
| | | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, |
| | | 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, |
| | | 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, |
| | | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, |
| | | 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, |
| | | 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, |
| | | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, |
| | | 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, |
| | | 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, |
| | | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, |
| | | 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, |
| | | 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, |
| | | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, |
| | | 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, |
| | | 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, |
| | | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, |
| | | 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, |
| | | 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, |
| | | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, |
| | | 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, |
| | | 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, |
| | | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, |
| | | 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D |
| | | }; |
| | | |
| | | unsigned int crc = ~0u; |
| | | int i,j; |
| | | if (crc_table[1] == 0) |
| | | for(i=0; i < 256; i++) |
| | | for (crc_table[i]=i, j=0; j < 8; ++j) |
| | | crc_table[i] = (crc_table[i] >> 1) ^ (crc_table[i] & 1 ? 0xedb88320 : 0); |
| | | int i; |
| | | for (i=0; i < len; ++i) |
| | | crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; |
| | | return ~crc; |
| | | } |
| | | |
| | | #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__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) |
| | | #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 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; |
| | | if (pb <= pc) return (unsigned char) b; |
| | | return (unsigned char) c; |
| | | if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); |
| | | if (pb <= pc) return STBIW_UCHAR(b); |
| | | return STBIW_UCHAR(c); |
| | | } |
| | | |
| | | // @OPTIMIZE: provide an option that always forces left-predict or paeth predict |
| | | unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) |
| | | { |
| | | int ctype[5] = { -1, 0, 4, 2, 6 }; |
| | |
| | | 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 ? mapping : firstmap; |
| | | 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) { |
| | | 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) |
| | |
| | | stbiw__wp32(o, x); |
| | | stbiw__wp32(o, y); |
| | | *o++ = 8; |
| | | *o++ = (unsigned char) ctype[n]; |
| | | *o++ = STBIW_UCHAR(ctype[n]); |
| | | *o++ = 0; |
| | | *o++ = 0; |
| | | *o++ = 0; |
| | |
| | | return out; |
| | | } |
| | | |
| | | int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) |
| | | { |
| | | FILE *f; |
| | | int len; |
| | | unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len); |
| | | if (!png) return 0; |
| | | if (png == NULL) return 0; |
| | | f = fopen(filename, "wb"); |
| | | if (!f) { STBIW_FREE(png); return 0; } |
| | | fwrite(png, 1, len, f); |
| | |
| | | STBIW_FREE(png); |
| | | return 1; |
| | | } |
| | | #endif |
| | | |
| | | STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int stride_bytes) |
| | | { |
| | | int len; |
| | | unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len); |
| | | if (png == NULL) return 0; |
| | | func(context, png, len); |
| | | STBIW_FREE(png); |
| | | return 1; |
| | | } |
| | | |
| | | |
| | | /* *************************************************************************** |
| | | * |
| | | * JPEG writer |
| | | * |
| | | * This is based on Jon Olick's jo_jpeg.cpp: |
| | | * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html |
| | | */ |
| | | |
| | | static const unsigned char stbiw__jpg_ZigZag[] = { 0,1,5,6,14,15,27,28,2,4,7,13,16,26,29,42,3,8,12,17,25,30,41,43,9,11,18, |
| | | 24,31,40,44,53,10,19,23,32,39,45,52,54,20,22,33,38,46,51,55,60,21,34,37,47,50,56,59,61,35,36,48,49,57,58,62,63 }; |
| | | |
| | | static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) { |
| | | int bitBuf = *bitBufP, bitCnt = *bitCntP; |
| | | bitCnt += bs[1]; |
| | | bitBuf |= bs[0] << (24 - bitCnt); |
| | | while(bitCnt >= 8) { |
| | | unsigned char c = (bitBuf >> 16) & 255; |
| | | stbiw__putc(s, c); |
| | | if(c == 255) { |
| | | stbiw__putc(s, 0); |
| | | } |
| | | bitBuf <<= 8; |
| | | bitCnt -= 8; |
| | | } |
| | | *bitBufP = bitBuf; |
| | | *bitCntP = bitCnt; |
| | | } |
| | | |
| | | static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) { |
| | | float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p; |
| | | float z1, z2, z3, z4, z5, z11, z13; |
| | | |
| | | float tmp0 = d0 + d7; |
| | | float tmp7 = d0 - d7; |
| | | float tmp1 = d1 + d6; |
| | | float tmp6 = d1 - d6; |
| | | float tmp2 = d2 + d5; |
| | | float tmp5 = d2 - d5; |
| | | float tmp3 = d3 + d4; |
| | | float tmp4 = d3 - d4; |
| | | |
| | | // Even part |
| | | float tmp10 = tmp0 + tmp3; // phase 2 |
| | | float tmp13 = tmp0 - tmp3; |
| | | float tmp11 = tmp1 + tmp2; |
| | | float tmp12 = tmp1 - tmp2; |
| | | |
| | | d0 = tmp10 + tmp11; // phase 3 |
| | | d4 = tmp10 - tmp11; |
| | | |
| | | z1 = (tmp12 + tmp13) * 0.707106781f; // c4 |
| | | d2 = tmp13 + z1; // phase 5 |
| | | d6 = tmp13 - z1; |
| | | |
| | | // Odd part |
| | | tmp10 = tmp4 + tmp5; // phase 2 |
| | | tmp11 = tmp5 + tmp6; |
| | | tmp12 = tmp6 + tmp7; |
| | | |
| | | // The rotator is modified from fig 4-8 to avoid extra negations. |
| | | z5 = (tmp10 - tmp12) * 0.382683433f; // c6 |
| | | z2 = tmp10 * 0.541196100f + z5; // c2-c6 |
| | | z4 = tmp12 * 1.306562965f + z5; // c2+c6 |
| | | z3 = tmp11 * 0.707106781f; // c4 |
| | | |
| | | z11 = tmp7 + z3; // phase 5 |
| | | z13 = tmp7 - z3; |
| | | |
| | | *d5p = z13 + z2; // phase 6 |
| | | *d3p = z13 - z2; |
| | | *d1p = z11 + z4; |
| | | *d7p = z11 - z4; |
| | | |
| | | *d0p = d0; *d2p = d2; *d4p = d4; *d6p = d6; |
| | | } |
| | | |
| | | static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) { |
| | | int tmp1 = val < 0 ? -val : val; |
| | | val = val < 0 ? val-1 : val; |
| | | bits[1] = 1; |
| | | while(tmp1 >>= 1) { |
| | | ++bits[1]; |
| | | } |
| | | bits[0] = val & ((1<<bits[1])-1); |
| | | } |
| | | |
| | | static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf, int *bitCnt, float *CDU, float *fdtbl, int DC, const unsigned short HTDC[256][2], const unsigned short HTAC[256][2]) { |
| | | const unsigned short EOB[2] = { HTAC[0x00][0], HTAC[0x00][1] }; |
| | | const unsigned short M16zeroes[2] = { HTAC[0xF0][0], HTAC[0xF0][1] }; |
| | | int dataOff, i, diff, end0pos; |
| | | int DU[64]; |
| | | |
| | | // DCT rows |
| | | for(dataOff=0; dataOff<64; dataOff+=8) { |
| | | stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+1], &CDU[dataOff+2], &CDU[dataOff+3], &CDU[dataOff+4], &CDU[dataOff+5], &CDU[dataOff+6], &CDU[dataOff+7]); |
| | | } |
| | | // DCT columns |
| | | for(dataOff=0; dataOff<8; ++dataOff) { |
| | | stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+8], &CDU[dataOff+16], &CDU[dataOff+24], &CDU[dataOff+32], &CDU[dataOff+40], &CDU[dataOff+48], &CDU[dataOff+56]); |
| | | } |
| | | // Quantize/descale/zigzag the coefficients |
| | | for(i=0; i<64; ++i) { |
| | | float v = CDU[i]*fdtbl[i]; |
| | | // DU[stbiw__jpg_ZigZag[i]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v + 0.5f)); |
| | | // ceilf() and floorf() are C99, not C89, but I /think/ they're not needed here anyway? |
| | | DU[stbiw__jpg_ZigZag[i]] = (int)(v < 0 ? v - 0.5f : v + 0.5f); |
| | | } |
| | | |
| | | // Encode DC |
| | | diff = DU[0] - DC; |
| | | if (diff == 0) { |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]); |
| | | } else { |
| | | unsigned short bits[2]; |
| | | stbiw__jpg_calcBits(diff, bits); |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]); |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); |
| | | } |
| | | // Encode ACs |
| | | end0pos = 63; |
| | | for(; (end0pos>0)&&(DU[end0pos]==0); --end0pos) { |
| | | } |
| | | // end0pos = first element in reverse order !=0 |
| | | if(end0pos == 0) { |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); |
| | | return DU[0]; |
| | | } |
| | | for(i = 1; i <= end0pos; ++i) { |
| | | int startpos = i; |
| | | int nrzeroes; |
| | | unsigned short bits[2]; |
| | | for (; DU[i]==0 && i<=end0pos; ++i) { |
| | | } |
| | | nrzeroes = i-startpos; |
| | | if ( nrzeroes >= 16 ) { |
| | | int lng = nrzeroes>>4; |
| | | int nrmarker; |
| | | for (nrmarker=1; nrmarker <= lng; ++nrmarker) |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes); |
| | | nrzeroes &= 15; |
| | | } |
| | | stbiw__jpg_calcBits(DU[i], bits); |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes<<4)+bits[1]]); |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); |
| | | } |
| | | if(end0pos != 63) { |
| | | stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); |
| | | } |
| | | return DU[0]; |
| | | } |
| | | |
| | | static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void* data, int quality) { |
| | | // Constants that don't pollute global namespace |
| | | static const unsigned char std_dc_luminance_nrcodes[] = {0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0}; |
| | | static const unsigned char std_dc_luminance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; |
| | | static const unsigned char std_ac_luminance_nrcodes[] = {0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d}; |
| | | static const unsigned char std_ac_luminance_values[] = { |
| | | 0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08, |
| | | 0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28, |
| | | 0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59, |
| | | 0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89, |
| | | 0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6, |
| | | 0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2, |
| | | 0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa |
| | | }; |
| | | static const unsigned char std_dc_chrominance_nrcodes[] = {0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0}; |
| | | static const unsigned char std_dc_chrominance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; |
| | | static const unsigned char std_ac_chrominance_nrcodes[] = {0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77}; |
| | | static const unsigned char std_ac_chrominance_values[] = { |
| | | 0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91, |
| | | 0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26, |
| | | 0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58, |
| | | 0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87, |
| | | 0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4, |
| | | 0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda, |
| | | 0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa |
| | | }; |
| | | // Huffman tables |
| | | static const unsigned short YDC_HT[256][2] = { {0,2},{2,3},{3,3},{4,3},{5,3},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9}}; |
| | | static const unsigned short UVDC_HT[256][2] = { {0,2},{1,2},{2,2},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9},{1022,10},{2046,11}}; |
| | | static const unsigned short YAC_HT[256][2] = { |
| | | {10,4},{0,2},{1,2},{4,3},{11,4},{26,5},{120,7},{248,8},{1014,10},{65410,16},{65411,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {12,4},{27,5},{121,7},{502,9},{2038,11},{65412,16},{65413,16},{65414,16},{65415,16},{65416,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {28,5},{249,8},{1015,10},{4084,12},{65417,16},{65418,16},{65419,16},{65420,16},{65421,16},{65422,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {58,6},{503,9},{4085,12},{65423,16},{65424,16},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {59,6},{1016,10},{65430,16},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {122,7},{2039,11},{65438,16},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {123,7},{4086,12},{65446,16},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {250,8},{4087,12},{65454,16},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {504,9},{32704,15},{65462,16},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {505,9},{65470,16},{65471,16},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {506,9},{65479,16},{65480,16},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {1017,10},{65488,16},{65489,16},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {1018,10},{65497,16},{65498,16},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {2040,11},{65506,16},{65507,16},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {65515,16},{65516,16},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {2041,11},{65525,16},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0} |
| | | }; |
| | | static const unsigned short UVAC_HT[256][2] = { |
| | | {0,2},{1,2},{4,3},{10,4},{24,5},{25,5},{56,6},{120,7},{500,9},{1014,10},{4084,12},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {11,4},{57,6},{246,8},{501,9},{2038,11},{4085,12},{65416,16},{65417,16},{65418,16},{65419,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {26,5},{247,8},{1015,10},{4086,12},{32706,15},{65420,16},{65421,16},{65422,16},{65423,16},{65424,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {27,5},{248,8},{1016,10},{4087,12},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{65430,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {58,6},{502,9},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{65438,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {59,6},{1017,10},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{65446,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {121,7},{2039,11},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{65454,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {122,7},{2040,11},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{65462,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {249,8},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{65470,16},{65471,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {503,9},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{65479,16},{65480,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {504,9},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{65488,16},{65489,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {505,9},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{65497,16},{65498,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {506,9},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{65506,16},{65507,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {2041,11},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{65515,16},{65516,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {16352,14},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{65525,16},{0,0},{0,0},{0,0},{0,0},{0,0}, |
| | | {1018,10},{32707,15},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0} |
| | | }; |
| | | static const int YQT[] = {16,11,10,16,24,40,51,61,12,12,14,19,26,58,60,55,14,13,16,24,40,57,69,56,14,17,22,29,51,87,80,62,18,22, |
| | | 37,56,68,109,103,77,24,35,55,64,81,104,113,92,49,64,78,87,103,121,120,101,72,92,95,98,112,100,103,99}; |
| | | static const int UVQT[] = {17,18,24,47,99,99,99,99,18,21,26,66,99,99,99,99,24,26,56,99,99,99,99,99,47,66,99,99,99,99,99,99, |
| | | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99}; |
| | | static const float aasf[] = { 1.0f * 2.828427125f, 1.387039845f * 2.828427125f, 1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f, |
| | | 1.0f * 2.828427125f, 0.785694958f * 2.828427125f, 0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f }; |
| | | |
| | | int row, col, i, k; |
| | | float fdtbl_Y[64], fdtbl_UV[64]; |
| | | unsigned char YTable[64], UVTable[64]; |
| | | |
| | | if(!data || !width || !height || comp > 4 || comp < 1) { |
| | | return 0; |
| | | } |
| | | |
| | | quality = quality ? quality : 90; |
| | | quality = quality < 1 ? 1 : quality > 100 ? 100 : quality; |
| | | quality = quality < 50 ? 5000 / quality : 200 - quality * 2; |
| | | |
| | | for(i = 0; i < 64; ++i) { |
| | | int uvti, yti = (YQT[i]*quality+50)/100; |
| | | YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti); |
| | | uvti = (UVQT[i]*quality+50)/100; |
| | | UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti); |
| | | } |
| | | |
| | | for(row = 0, k = 0; row < 8; ++row) { |
| | | for(col = 0; col < 8; ++col, ++k) { |
| | | fdtbl_Y[k] = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); |
| | | fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); |
| | | } |
| | | } |
| | | |
| | | // Write Headers |
| | | { |
| | | static const unsigned char head0[] = { 0xFF,0xD8,0xFF,0xE0,0,0x10,'J','F','I','F',0,1,1,0,0,1,0,1,0,0,0xFF,0xDB,0,0x84,0 }; |
| | | static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 }; |
| | | const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width), |
| | | 3,1,0x11,0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 }; |
| | | s->func(s->context, (void*)head0, sizeof(head0)); |
| | | s->func(s->context, (void*)YTable, sizeof(YTable)); |
| | | stbiw__putc(s, 1); |
| | | s->func(s->context, UVTable, sizeof(UVTable)); |
| | | s->func(s->context, (void*)head1, sizeof(head1)); |
| | | s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1); |
| | | s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values)); |
| | | stbiw__putc(s, 0x10); // HTYACinfo |
| | | s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1); |
| | | s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values)); |
| | | stbiw__putc(s, 1); // HTUDCinfo |
| | | s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1); |
| | | s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values)); |
| | | stbiw__putc(s, 0x11); // HTUACinfo |
| | | s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1); |
| | | s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values)); |
| | | s->func(s->context, (void*)head2, sizeof(head2)); |
| | | } |
| | | |
| | | // Encode 8x8 macroblocks |
| | | { |
| | | static const unsigned short fillBits[] = {0x7F, 7}; |
| | | const unsigned char *imageData = (const unsigned char *)data; |
| | | int DCY=0, DCU=0, DCV=0; |
| | | int bitBuf=0, bitCnt=0; |
| | | // comp == 2 is grey+alpha (alpha is ignored) |
| | | int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0; |
| | | int x, y, pos; |
| | | for(y = 0; y < height; y += 8) { |
| | | for(x = 0; x < width; x += 8) { |
| | | 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; |
| | | float r, g, b; |
| | | if(row >= height) { |
| | | p -= width*comp*(row+1 - height); |
| | | } |
| | | if(col >= width) { |
| | | p -= comp*(col+1 - width); |
| | | } |
| | | |
| | | r = imageData[p+0]; |
| | | g = imageData[p+ofsG]; |
| | | b = imageData[p+ofsB]; |
| | | YDU[pos]=+0.29900f*r+0.58700f*g+0.11400f*b-128; |
| | | UDU[pos]=-0.16874f*r-0.33126f*g+0.50000f*b; |
| | | VDU[pos]=+0.50000f*r-0.41869f*g-0.08131f*b; |
| | | } |
| | | } |
| | | |
| | | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT); |
| | | DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); |
| | | DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); |
| | | } |
| | | } |
| | | |
| | | // Do the bit alignment of the EOI marker |
| | | stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits); |
| | | } |
| | | |
| | | // EOI |
| | | stbiw__putc(s, 0xFF); |
| | | stbiw__putc(s, 0xD9); |
| | | |
| | | return 1; |
| | | } |
| | | |
| | | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality) |
| | | { |
| | | stbi__write_context s; |
| | | stbi__start_write_callbacks(&s, func, context); |
| | | return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality); |
| | | } |
| | | |
| | | |
| | | #ifndef STBI_WRITE_NO_STDIO |
| | | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality) |
| | | { |
| | | stbi__write_context s; |
| | | if (stbi__start_write_file(&s,filename)) { |
| | | int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); |
| | | stbi__end_write_file(&s); |
| | | return r; |
| | | } else |
| | | return 0; |
| | | } |
| | | #endif |
| | | |
| | | #endif // STB_IMAGE_WRITE_IMPLEMENTATION |
| | | |
| | | /* Revision history |
| | | 1.07 (2017-07-24) |
| | | doc fix |
| | | 1.06 (2017-07-23) |
| | | writing JPEG (using Jon Olick's code) |
| | | 1.05 ??? |
| | | 1.04 (2017-03-03) |
| | | monochrome BMP expansion |
| | | 1.03 ??? |
| | | 1.02 (2016-04-02) |
| | | avoid allocating large structures on the stack |
| | | 1.01 (2016-01-16) |
| | | STBIW_REALLOC_SIZED: support allocators with no realloc support |
| | | avoid race-condition in crc initialization |
| | | minor compile issues |
| | | 1.00 (2015-09-14) |
| | | installable file IO function |
| | | 0.99 (2015-09-13) |
| | | warning fixes; TGA rle support |
| | | 0.98 (2015-04-08) |
| | | added STBIW_MALLOC, STBIW_ASSERT etc |
| | | 0.97 (2015-01-18) |
| | |
| | | first public release |
| | | 0.90 first internal release |
| | | */ |
| | | |
| | | /* |
| | | ------------------------------------------------------------------------------ |
| | | This software is available under 2 licenses -- choose whichever you prefer. |
| | | ------------------------------------------------------------------------------ |
| | | ALTERNATIVE A - MIT License |
| | | Copyright (c) 2017 Sean Barrett |
| | | Permission is hereby granted, free of charge, to any person obtaining a copy of |
| | | this software and associated documentation files (the "Software"), to deal in |
| | | the Software without restriction, including without limitation the rights to |
| | | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
| | | of the Software, and to permit persons to whom the Software is furnished to do |
| | | so, subject to the following conditions: |
| | | The above copyright notice and this permission notice shall be included in all |
| | | copies or substantial portions of the Software. |
| | | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| | | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| | | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| | | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| | | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| | | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| | | SOFTWARE. |
| | | ------------------------------------------------------------------------------ |
| | | ALTERNATIVE B - Public Domain (www.unlicense.org) |
| | | This is free and unencumbered software released into the public domain. |
| | | Anyone is free to copy, modify, publish, use, compile, sell, or distribute this |
| | | software, either in source code form or as a compiled binary, for any purpose, |
| | | commercial or non-commercial, and by any means. |
| | | In jurisdictions that recognize copyright laws, the author or authors of this |
| | | software dedicate any and all copyright interest in the software to the public |
| | | domain. We make this dedication for the benefit of the public at large and to |
| | | the detriment of our heirs and successors. We intend this dedication to be an |
| | | overt act of relinquishment in perpetuity of all present and future rights to |
| | | this software under copyright law. |
| | | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| | | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| | | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| | | AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| | | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| | | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| | | ------------------------------------------------------------------------------ |
| | | */ |