commit 93ff4483e3870c4418ca2428435a71d3c1610af3 parent 943b00d83ba561253e7921413b6fd146129ea75a Author: Michael Savage <mikejsavage@gmail.com> Date: Sat May 27 14:49:34 +0300 Update STB image/image_write/perlin Diffstat:
| stb_image.h | | | 582 | +++++++++++++++++++++++++++++++++++++++++++++---------------------------------- |
| stb_image_write.h | | | 64 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++---------- |
| stb_perlin.h | | | 164 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------- |
diff --git a/stb_image.h b/stb_image.h @@ -1,4 +1,4 @@ -/* stb_image - v2.13 - public domain image loader - http://nothings.org/stb_image.h +/* stb_image - v2.15 - public domain image loader - http://nothings.org/stb_image.h no warranty implied; use at your own risk Do this: @@ -21,7 +21,7 @@ avoid problematic images and only need the trivial interface JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib) - PNG 1/2/4/8-bit-per-channel (16 bpc not supported) + PNG 1/2/4/8/16-bit-per-channel TGA (not sure what subset, if a subset) BMP non-1bpp, non-RLE @@ -42,115 +42,19 @@ Full documentation under "DOCUMENTATION" below. - Revision 2.00 release notes: - - - Progressive JPEG is now supported. - - - PPM and PGM binary formats are now supported, thanks to Ken Miller. - - - x86 platforms now make use of SSE2 SIMD instructions for - JPEG decoding, and ARM platforms can use NEON SIMD if requested. - This work was done by Fabian "ryg" Giesen. SSE2 is used by - default, but NEON must be enabled explicitly; see docs. - - With other JPEG optimizations included in this version, we see - 2x speedup on a JPEG on an x86 machine, and a 1.5x speedup - on a JPEG on an ARM machine, relative to previous versions of this - library. The same results will not obtain for all JPGs and for all - x86/ARM machines. (Note that progressive JPEGs are significantly - slower to decode than regular JPEGs.) This doesn't mean that this - is the fastest JPEG decoder in the land; rather, it brings it - closer to parity with standard libraries. If you want the fastest - decode, look elsewhere. (See "Philosophy" section of docs below.) - - See final bullet items below for more info on SIMD. - - - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing - the memory allocator. Unlike other STBI libraries, these macros don't - support a context parameter, so if you need to pass a context in to - the allocator, you'll have to store it in a global or a thread-local - variable. - - - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and - STBI_NO_LINEAR. - STBI_NO_HDR: suppress implementation of .hdr reader format - STBI_NO_LINEAR: suppress high-dynamic-range light-linear float API - - - You can suppress implementation of any of the decoders to reduce - your code footprint by #defining one or more of the following - symbols before creating the implementation. - - STBI_NO_JPEG - STBI_NO_PNG - STBI_NO_BMP - STBI_NO_PSD - STBI_NO_TGA - STBI_NO_GIF - STBI_NO_HDR - STBI_NO_PIC - STBI_NO_PNM (.ppm and .pgm) - - - You can request *only* certain decoders and suppress all other ones - (this will be more forward-compatible, as addition of new decoders - doesn't require you to disable them explicitly): - - STBI_ONLY_JPEG - STBI_ONLY_PNG - STBI_ONLY_BMP - STBI_ONLY_PSD - STBI_ONLY_TGA - STBI_ONLY_GIF - STBI_ONLY_HDR - STBI_ONLY_PIC - STBI_ONLY_PNM (.ppm and .pgm) - - Note that you can define multiples of these, and you will get all - of them ("only x" and "only y" is interpreted to mean "only x&y"). - - - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still - want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB - - - Compilation of all SIMD code can be suppressed with - #define STBI_NO_SIMD - It should not be necessary to disable SIMD unless you have issues - compiling (e.g. using an x86 compiler which doesn't support SSE - intrinsics or that doesn't support the method used to detect - SSE2 support at run-time), and even those can be reported as - bugs so I can refine the built-in compile-time checking to be - smarter. - - - The old STBI_SIMD system which allowed installing a user-defined - IDCT etc. has been removed. If you need this, don't upgrade. My - assumption is that almost nobody was doing this, and those who - were will find the built-in SIMD more satisfactory anyway. - - - RGB values computed for JPEG images are slightly different from - previous versions of stb_image. (This is due to using less - integer precision in SIMD.) The C code has been adjusted so - that the same RGB values will be computed regardless of whether - SIMD support is available, so your app should always produce - consistent results. But these results are slightly different from - previous versions. (Specifically, about 3% of available YCbCr values - will compute different RGB results from pre-1.49 versions by +-1; - most of the deviating values are one smaller in the G channel.) - - - If you must produce consistent results with previous versions of - stb_image, #define STBI_JPEG_OLD and you will get the same results - you used to; however, you will not get the SIMD speedups for - the YCbCr-to-RGB conversion step (although you should still see - significant JPEG speedup from the other changes). - - Please note that STBI_JPEG_OLD is a temporary feature; it will be - removed in future versions of the library. It is only intended for - near-term back-compatibility use. - - - Latest revision history: +LICENSE + + See end of file for license information. + +RECENT REVISION HISTORY: + + 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 RGB-format JPEG; remove white matting in PSD; - allocate large structures on the stack; + allocate large structures on the stack; correct channel count for PNG & BMP 2.10 (2016-01-22) avoid warning introduced in 2.09 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED @@ -172,34 +76,28 @@ Tom Seddon (pic) Omar Cornut (1/2/4-bit PNG) Thatcher Ulrich (psd) Nicolas Guillemot (vertical flip) Ken Miller (pgm, ppm) Richard Mitton (16-bit PSD) - urraka@github (animated gif) Junggon Kim (PNM comments) + github:urraka (animated gif) Junggon Kim (PNM comments) Daniel Gibson (16-bit TGA) - + socks-the-fox (16-bit PNG) + Jeremy Sawicki (handle all ImageNet JPGs) Optimizations & bugfixes Fabian "ryg" Giesen Arseny Kapoulkine Bug & warning fixes Marc LeBlanc David Woo Guillaume George Martins Mozeiko - Christpher Lloyd Martin Golini Jerry Jansson Joseph Thomson - Dave Moore Roy Eltham Hayaki Saito Phil Jordan - Won Chun Luke Graham Johan Duparc Nathan Reed - the Horde3D community Thomas Ruf Ronny Chevalier Nick Verigakis - Janez Zemva John Bartholomew Michal Cichon svdijk@github - Jonathan Blow Ken Hamada Tero Hanninen Baldur Karlsson - Laurent Gomila Cort Stratton Sergio Gonzalez romigrou@github - Aruelien Pocheville Thibault Reuille Cass Everitt Matthew Gregan - Ryamond Barbiero Paul Du Bois Engin Manap snagar@github - Michaelangel007@github Oriol Ferrer Mesia socks-the-fox Zelex@github - Philipp Wiesemann Josh Tobin rlyeh@github grim210@github - Blazej Dariusz Roszkowski - - -LICENSE - -This software is dual-licensed to the public domain and under the following -license: you are granted a perpetual, irrevocable license to copy, modify, -publish, and distribute this file as you see fit. + Christpher Lloyd Jerry Jansson Joseph Thomson Phil Jordan + Dave Moore Roy Eltham Hayaki Saito Nathan Reed + Won Chun Luke Graham Johan Duparc Nick Verigakis + the Horde3D community Thomas Ruf Ronny Chevalier Baldur Karlsson + Janez Zemva John Bartholomew Michal Cichon github:rlyeh + Jonathan Blow Ken Hamada Tero Hanninen github:romigrou + Laurent Gomila Cort Stratton Sergio Gonzalez github:svdijk + Aruelien Pocheville Thibault Reuille Cass Everitt github:snagar + Ryamond Barbiero Paul Du Bois Engin Manap github:Zelex + Michaelangel007@github Philipp Wiesemann Dale Weiler github:grim210 + Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:sammyhw + Blazej Dariusz Roszkowski Gregory Mullen github:phprus */ @@ -274,13 +172,13 @@ publish, and distribute this file as you see fit. // and for best performance I may provide less-easy-to-use APIs that give higher // performance, in addition to the easy to use ones. Nevertheless, it's important // to keep in mind that from the standpoint of you, a client of this library, -// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all. +// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all. // // Some secondary priorities arise directly from the first two, some of which // make more explicit reasons why performance can't be emphasized. // // - Portable ("ease of use") -// - Small footprint ("easy to maintain") +// - Small source code footprint ("easy to maintain") // - No dependencies ("ease of use") // // =========================================================================== @@ -312,13 +210,6 @@ publish, and distribute this file as you see fit. // (at least this is true for iOS and Android). Therefore, the NEON support is // toggled by a build flag: define STBI_NEON to get NEON loops. // -// The output of the JPEG decoder is slightly different from versions where -// SIMD support was introduced (that is, for versions before 1.49). The -// difference is only +-1 in the 8-bit RGB channels, and only on a small -// fraction of pixels. You can force the pre-1.49 behavior by defining -// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path -// and hence cost some performance. -// // If for some reason you do not want to use any of SIMD code, or if // you have issues compiling it, you can disable it entirely by // defining STBI_NO_SIMD. @@ -374,6 +265,41 @@ publish, and distribute this file as you see fit. // says there's premultiplied data (currently only happens in iPhone images, // and only if iPhone convert-to-rgb processing is on). // +// =========================================================================== +// +// ADDITIONAL CONFIGURATION +// +// - You can suppress implementation of any of the decoders to reduce +// your code footprint by #defining one or more of the following +// symbols before creating the implementation. +// +// STBI_NO_JPEG +// STBI_NO_PNG +// STBI_NO_BMP +// STBI_NO_PSD +// STBI_NO_TGA +// STBI_NO_GIF +// STBI_NO_HDR +// STBI_NO_PIC +// STBI_NO_PNM (.ppm and .pgm) +// +// - You can request *only* certain decoders and suppress all other ones +// (this will be more forward-compatible, as addition of new decoders +// doesn't require you to disable them explicitly): +// +// STBI_ONLY_JPEG +// STBI_ONLY_PNG +// STBI_ONLY_BMP +// STBI_ONLY_PSD +// STBI_ONLY_TGA +// STBI_ONLY_GIF +// STBI_ONLY_HDR +// STBI_ONLY_PIC +// STBI_ONLY_PNM (.ppm and .pgm) +// +// - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still +// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB +// #ifndef STBI_NO_STDIO @@ -658,12 +584,14 @@ typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1]; #define STBI__X86_TARGET #endif -#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) -// NOTE: not clear do we actually need this for the 64-bit path? +#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD) // gcc doesn't support sse2 intrinsics unless you compile with -msse2, -// (but compiling with -msse2 allows the compiler to use SSE2 everywhere; -// this is just broken and gcc are jerks for not fixing it properly -// http://www.virtualdub.org/blog/pivot/entry.php?id=363 ) +// which in turn means it gets to use SSE2 everywhere. This is unfortunate, +// but previous attempts to provide the SSE2 functions with runtime +// detection caused numerous issues. The way architecture extensions are +// exposed in GCC/Clang is, sadly, not really suited for one-file libs. +// New behavior: if compiled with -msse2, we use SSE2 without any +// detection; if not, we don't use it at all. #define STBI_NO_SIMD #endif @@ -721,14 +649,10 @@ static int stbi__sse2_available() static int stbi__sse2_available() { -#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later - // GCC 4.8+ has a nice way to do this - return __builtin_cpu_supports("sse2"); -#else - // portable way to do this, preferably without using GCC inline ASM? - // just bail for now. - return 0; -#endif + // If we're even attempting to compile this on GCC/Clang, that means + // -msse2 is on, which means the compiler is allowed to use SSE2 + // instructions at will, and so are we. + return 1; } #endif #endif @@ -1730,7 +1654,7 @@ typedef struct stbi__context *s; stbi__huffman huff_dc[4]; stbi__huffman huff_ac[4]; - stbi_uc dequant[4][64]; + stbi__uint16 dequant[4][64]; stbi__int16 fast_ac[4][1 << FAST_BITS]; // sizes for components, interleaved MCUs @@ -1766,6 +1690,8 @@ typedef struct int succ_high; int succ_low; int eob_run; + int jfif; + int app14_color_transform; // Adobe APP14 tag int rgb; int scan_n, order[4]; @@ -1836,7 +1762,7 @@ static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h) // magnitude code followed by receive_extend code int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits); int m = 1 << (magbits - 1); - if (k < m) k += (-1 << magbits) + 1; + if (k < m) k += (~0U << magbits) + 1; // if the result is small enough, we can fit it in fast_ac table if (k >= -128 && k <= 127) fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits)); @@ -1851,6 +1777,7 @@ static void stbi__grow_buffer_unsafe(stbi__jpeg *j) int b = j->nomore ? 0 : stbi__get8(j->s); if (b == 0xff) { int c = stbi__get8(j->s); + while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes if (c != 0) { j->marker = (unsigned char) c; j->nomore = 1; @@ -1975,7 +1902,7 @@ static stbi_uc stbi__jpeg_dezigzag[64+15] = }; // decode one 64-entry block-- -static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant) +static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant) { int diff,dc,k; int t; @@ -2684,7 +2611,7 @@ static stbi_uc stbi__get_marker(stbi__jpeg *j) x = stbi__get8(j->s); if (x != 0xff) return STBI__MARKER_none; while (x == 0xff) - x = stbi__get8(j->s); + x = stbi__get8(j->s); // consume repeated 0xff fill bytes return x; } @@ -2699,7 +2626,7 @@ static void stbi__jpeg_reset(stbi__jpeg *j) j->code_bits = 0; j->code_buffer = 0; j->nomore = 0; - j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; + j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0; j->marker = STBI__MARKER_none; j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; j->eob_run = 0; @@ -2831,7 +2758,7 @@ static int stbi__parse_entropy_coded_data(stbi__jpeg *z) } } -static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant) +static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant) { int i; for (i=0; i < 64; ++i) @@ -2873,13 +2800,14 @@ static int stbi__process_marker(stbi__jpeg *z, int m) L = stbi__get16be(z->s)-2; while (L > 0) { int q = stbi__get8(z->s); - int p = q >> 4; + int p = q >> 4, sixteen = (p != 0); int t = q & 15,i; - if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG"); + if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG"); if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG"); + for (i=0; i < 64; ++i) - z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s); - L -= 65; + z->dequant[t][stbi__jpeg_dezigzag[i]] = sixteen ? stbi__get16be(z->s) : stbi__get8(z->s); + L -= (sixteen ? 129 : 65); } return L==0; @@ -2912,12 +2840,50 @@ static int stbi__process_marker(stbi__jpeg *z, int m) } return L==0; } + // check for comment block or APP blocks if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) { - stbi__skip(z->s, stbi__get16be(z->s)-2); + L = stbi__get16be(z->s); + if (L < 2) { + if (m == 0xFE) + return stbi__err("bad COM len","Corrupt JPEG"); + else + return stbi__err("bad APP len","Corrupt JPEG"); + } + L -= 2; + + if (m == 0xE0 && L >= 5) { // JFIF APP0 segment + static const unsigned char tag[5] = {'J','F','I','F','\0'}; + int ok = 1; + int i; + for (i=0; i < 5; ++i) + if (stbi__get8(z->s) != tag[i]) + ok = 0; + L -= 5; + if (ok) + z->jfif = 1; + } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment + static const unsigned char tag[6] = {'A','d','o','b','e','\0'}; + int ok = 1; + int i; + for (i=0; i < 6; ++i) + if (stbi__get8(z->s) != tag[i]) + ok = 0; + L -= 6; + if (ok) { + stbi__get8(z->s); // version + stbi__get16be(z->s); // flags0 + stbi__get16be(z->s); // flags1 + z->app14_color_transform = stbi__get8(z->s); // color transform + L -= 6; + } + } + + stbi__skip(z->s, L); return 1; } - return 0; + + return stbi__err("unknown marker","Corrupt JPEG"); } // after we see SOS @@ -2991,7 +2957,7 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan) s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires c = stbi__get8(s); - if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG"); // JFIF requires + if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG"); s->img_n = c; for (i=0; i < c; ++i) { z->img_comp[i].data = NULL; @@ -3004,13 +2970,8 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan) for (i=0; i < s->img_n; ++i) { static unsigned char rgb[3] = { 'R', 'G', 'B' }; z->img_comp[i].id = stbi__get8(s); - if (z->img_comp[i].id != i+1) // JFIF requires - if (z->img_comp[i].id != i) { // some version of jpegtran outputs non-JFIF-compliant files! - // somethings output this (see http://fileformats.archiveteam.org/wiki/JPEG#Color_format) - if (z->img_comp[i].id != rgb[i]) - return stbi__err("bad component ID","Corrupt JPEG"); - ++z->rgb; - } + if (s->img_n == 3 && z->img_comp[i].id == rgb[i]) + ++z->rgb; q = stbi__get8(s); z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG"); z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG"); @@ -3082,6 +3043,8 @@ static int stbi__process_frame_header(stbi__jpeg *z, int scan) static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan) { int m; + z->jfif = 0; + z->app14_color_transform = -1; // valid values are 0,1,2 z->marker = STBI__MARKER_none; // initialize cached marker to empty m = stbi__get_marker(z); if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG"); @@ -3123,12 +3086,15 @@ static int stbi__decode_jpeg_image(stbi__jpeg *j) if (x == 255) { j->marker = stbi__get8(j->s); break; - } else if (x != 0) { - return stbi__err("junk before marker", "Corrupt JPEG"); } } // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0 } + } else if (stbi__DNL(m)) { + int Ld = stbi__get16be(j->s); + stbi__uint32 NL = stbi__get16be(j->s); + if (Ld != 4) stbi__err("bad DNL len", "Corrupt JPEG"); + if (NL != j->s->img_y) stbi__err("bad DNL height", "Corrupt JPEG"); } else { if (!stbi__process_marker(j, m)) return 0; } @@ -3347,38 +3313,9 @@ static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_ return out; } -#ifdef STBI_JPEG_OLD -// this is the same YCbCr-to-RGB calculation that stb_image has used -// historically before the algorithm changes in 1.49 -#define float2fixed(x) ((int) ((x) * 65536 + 0.5)) -static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) -{ - int i; - for (i=0; i < count; ++i) { - int y_fixed = (y[i] << 16) + 32768; // rounding - int r,g,b; - int cr = pcr[i] - 128; - int cb = pcb[i] - 128; - r = y_fixed + cr*float2fixed(1.40200f); - g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); - b = y_fixed + cb*float2fixed(1.77200f); - r >>= 16; - g >>= 16; - b >>= 16; - if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } - if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } - if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } - out[0] = (stbi_uc)r; - out[1] = (stbi_uc)g; - out[2] = (stbi_uc)b; - out[3] = 255; - out += step; - } -} -#else // this is a reduced-precision calculation of YCbCr-to-RGB introduced // to make sure the code produces the same results in both SIMD and scalar -#define float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) +#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8) static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step) { int i; @@ -3387,9 +3324,9 @@ static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc int r,g,b; int cr = pcr[i] - 128; int cb = pcb[i] - 128; - r = y_fixed + cr* float2fixed(1.40200f); - g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); - b = y_fixed + cb* float2fixed(1.77200f); + r = y_fixed + cr* stbi__float2fixed(1.40200f); + g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* stbi__float2fixed(1.77200f); r >>= 20; g >>= 20; b >>= 20; @@ -3403,7 +3340,6 @@ static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc out += step; } } -#endif #if defined(STBI_SSE2) || defined(STBI_NEON) static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step) @@ -3522,9 +3458,9 @@ static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc cons int r,g,b; int cr = pcr[i] - 128; int cb = pcb[i] - 128; - r = y_fixed + cr* float2fixed(1.40200f); - g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000); - b = y_fixed + cb* float2fixed(1.77200f); + r = y_fixed + cr* stbi__float2fixed(1.40200f); + g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000); + b = y_fixed + cb* stbi__float2fixed(1.77200f); r >>= 20; g >>= 20; b >>= 20; @@ -3550,18 +3486,14 @@ static void stbi__setup_jpeg(stbi__jpeg *j) #ifdef STBI_SSE2 if (stbi__sse2_available()) { j->idct_block_kernel = stbi__idct_simd; - #ifndef STBI_JPEG_OLD j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; - #endif j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; } #endif #ifdef STBI_NEON j->idct_block_kernel = stbi__idct_simd; - #ifndef STBI_JPEG_OLD j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd; - #endif j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd; #endif } @@ -3582,9 +3514,16 @@ typedef struct int ypos; // which pre-expansion row we're on } stbi__resample; +// fast 0..255 * 0..255 => 0..255 rounded multiplication +static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y) +{ + unsigned int t = x*y + 128; + return (stbi_uc) ((t + (t >>8)) >> 8); +} + static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) { - int n, decode_n; + int n, decode_n, is_rgb; z->s->img_n = 0; // make stbi__cleanup_jpeg safe // validate req_comp @@ -3594,9 +3533,11 @@ static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; } // determine actual number of components to generate - n = req_comp ? req_comp : z->s->img_n; + n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1; + + is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif)); - if (z->s->img_n == 3 && n < 3) + if (z->s->img_n == 3 && n < 3 && !is_rgb) decode_n = 1; else decode_n = z->s->img_n; @@ -3656,7 +3597,7 @@ static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp if (n >= 3) { stbi_uc *y = coutput[0]; if (z->s->img_n == 3) { - if (z->rgb == 3) { + if (is_rgb) { for (i=0; i < z->s->img_x; ++i) { out[0] = y[i]; out[1] = coutput[1][i]; @@ -3667,6 +3608,28 @@ static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp } else { z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); } + } else if (z->s->img_n == 4) { + if (z->app14_color_transform == 0) { // CMYK + for (i=0; i < z->s->img_x; ++i) { + stbi_uc k = coutput[3][i]; + out[0] = stbi__blinn_8x8(coutput[0][i], k); + out[1] = stbi__blinn_8x8(coutput[1][i], k); + out[2] = stbi__blinn_8x8(coutput[2][i], k); + out[3] = 255; + out += n; + } + } else if (z->app14_color_transform == 2) { // YCCK + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + for (i=0; i < z->s->img_x; ++i) { + stbi_uc k = coutput[3][i]; + out[0] = stbi__blinn_8x8(255 - out[0], k); + out[1] = stbi__blinn_8x8(255 - out[1], k); + out[2] = stbi__blinn_8x8(255 - out[2], k); + out += n; + } + } else { // YCbCr + alpha? Ignore the fourth channel for now + z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n); + } } else for (i=0; i < z->s->img_x; ++i) { out[0] = out[1] = out[2] = y[i]; @@ -3674,17 +3637,45 @@ static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp out += n; } } else { - stbi_uc *y = coutput[0]; - if (n == 1) - for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; - else - for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255; + if (is_rgb) { + if (n == 1) + for (i=0; i < z->s->img_x; ++i) + *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); + else { + for (i=0; i < z->s->img_x; ++i, out += 2) { + out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]); + out[1] = 255; + } + } + } else if (z->s->img_n == 4 && z->app14_color_transform == 0) { + for (i=0; i < z->s->img_x; ++i) { + stbi_uc k = coutput[3][i]; + stbi_uc r = stbi__blinn_8x8(coutput[0][i], k); + stbi_uc g = stbi__blinn_8x8(coutput[1][i], k); + stbi_uc b = stbi__blinn_8x8(coutput[2][i], k); + out[0] = stbi__compute_y(r, g, b); + out[1] = 255; + out += n; + } + } else if (z->s->img_n == 4 && z->app14_color_transform == 2) { + for (i=0; i < z->s->img_x; ++i) { + out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]); + out[1] = 255; + out += n; + } + } else { + stbi_uc *y = coutput[0]; + if (n == 1) + for (i=0; i < z->s->img_x; ++i) out[i] = y[i]; + else + for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255; + } } } stbi__cleanup_jpeg(z); *out_x = z->s->img_x; *out_y = z->s->img_y; - if (comp) *comp = z->s->img_n; // report original components, not output + if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output return output; } } @@ -3693,6 +3684,7 @@ static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int re { unsigned char* result; stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg)); + STBI_NOTUSED(ri); j->s = s; stbi__setup_jpeg(j); result = load_jpeg_image(j, x,y,comp,req_comp); @@ -3703,11 +3695,12 @@ static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int re static int stbi__jpeg_test(stbi__context *s) { int r; - stbi__jpeg j; - j.s = s; - stbi__setup_jpeg(&j); - r = stbi__decode_jpeg_header(&j, STBI__SCAN_type); + stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg)); + j->s = s; + stbi__setup_jpeg(j); + r = stbi__decode_jpeg_header(j, STBI__SCAN_type); stbi__rewind(s); + STBI_FREE(j); return r; } @@ -3719,7 +3712,7 @@ static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp) } if (x) *x = j->s->img_x; if (y) *y = j->s->img_y; - if (comp) *comp = j->s->img_n; + if (comp) *comp = j->s->img_n >= 3 ? 3 : 1; return 1; } @@ -3776,7 +3769,7 @@ stbi_inline static int stbi__bit_reverse(int v, int bits) return stbi__bitreverse16(v) >> (16-bits); } -static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num) +static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num) { int i,k=0; int code, next_code[16], sizes[17]; @@ -4066,9 +4059,24 @@ static int stbi__parse_zlib_header(stbi__zbuf *a) return 1; } -// @TODO: should statically initialize these for optimal thread safety -static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32]; -static void stbi__init_zdefaults(void) +static const stbi_uc stbi__zdefault_length[288] = +{ + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8 +}; +static const stbi_uc stbi__zdefault_distance[32] = +{ + 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5 +}; +/* +Init algorithm: { int i; // use <= to match clearly with spec for (i=0; i <= 143; ++i) stbi__zdefault_length[i] = 8; @@ -4078,6 +4086,7 @@ static void stbi__init_zdefaults(void) for (i=0; i <= 31; ++i) stbi__zdefault_distance[i] = 5; } +*/ static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) { @@ -4096,7 +4105,6 @@ static int stbi__parse_zlib(stbi__zbuf *a, int parse_header) } else { if (type == 1) { // use fixed code lengths - if (!stbi__zdefault_distance[31]) stbi__init_zdefaults(); if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0; if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0; } else { @@ -4297,7 +4305,7 @@ static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 r for (j=0; j < y; ++j) { stbi_uc *cur = a->out + stride*j; - stbi_uc *prior = cur - stride; + stbi_uc *prior; int filter = *raw++; if (filter > 4) @@ -4309,6 +4317,7 @@ static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 r filter_bytes = 1; width = img_width_bytes; } + prior = cur - stride; // bugfix: need to compute this after 'cur +=' computation above // if first row, use special filter that doesn't sample previous row if (j == 0) filter = first_row_filter[filter]; @@ -4701,7 +4710,7 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)"); z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only"); color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG"); - if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG"); + if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG"); if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG"); comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG"); filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG"); @@ -4842,7 +4851,10 @@ static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, st void *result=NULL; if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error"); if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) { - ri->bits_per_channel = p->depth; + if (p->depth < 8) + ri->bits_per_channel = 8; + else + ri->bits_per_channel = p->depth; result = p->out; p->out = NULL; if (req_comp && req_comp != p->s->img_out_n) { @@ -4981,7 +4993,7 @@ static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info) info->offset = stbi__get32le(s); info->hsz = hsz = stbi__get32le(s); info->mr = info->mg = info->mb = info->ma = 0; - + if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown"); if (hsz == 12) { s->img_x = stbi__get16le(s); @@ -5066,7 +5078,7 @@ static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req stbi__bmp_data info; STBI_NOTUSED(ri); - info.all_a = 255; + info.all_a = 255; if (stbi__bmp_parse_header(s, &info) == NULL) return NULL; // error code already set @@ -5185,7 +5197,7 @@ static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req stbi__skip(s, pad); } } - + // if alpha channel is all 0s, replace with all 255s if (target == 4 && all_a == 0) for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4) @@ -5372,7 +5384,7 @@ static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req unsigned char *tga_data; unsigned char *tga_palette = NULL; int i, j; - unsigned char raw_data[4]; + unsigned char raw_data[4] = {0}; int RLE_count = 0; int RLE_repeating = 0; int read_next_pixel = 1; @@ -5719,7 +5731,7 @@ static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req // Fill this channel with default data. if (bitdepth == 16 && bpc == 16) { stbi__uint16 *q = ((stbi__uint16 *) out) + channel; - stbi_uc val = channel == 3 ? 65535 : 0; + stbi__uint16 val = channel == 3 ? 65535 : 0; for (i = 0; i < pixelCount; i++, q += 4) *q = val; } else { @@ -5968,9 +5980,11 @@ static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *c static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri) { stbi_uc *result; - int i, x,y; + int i, x,y, internal_comp; STBI_NOTUSED(ri); + if (!comp) comp = &internal_comp; + for (i=0; i<92; ++i) stbi__get8(s); @@ -6589,6 +6603,11 @@ static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp) char buffer[STBI__HDR_BUFLEN]; char *token; int valid = 0; + int dummy; + + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; if (stbi__hdr_test(s) == 0) { stbi__rewind( s ); @@ -6630,14 +6649,14 @@ static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) void *p; stbi__bmp_data info; - info.all_a = 255; + info.all_a = 255; p = stbi__bmp_parse_header(s, &info); stbi__rewind( s ); if (p == NULL) return 0; - *x = s->img_x; - *y = s->img_y; - *comp = info.ma ? 4 : 3; + if (x) *x = s->img_x; + if (y) *y = s->img_y; + if (comp) *comp = info.ma ? 4 : 3; return 1; } #endif @@ -6645,7 +6664,10 @@ static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp) #ifndef STBI_NO_PSD static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) { - int channelCount; + int channelCount, dummy; + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; if (stbi__get32be(s) != 0x38425053) { stbi__rewind( s ); return 0; @@ -6678,9 +6700,13 @@ static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp) #ifndef STBI_NO_PIC static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp) { - int act_comp=0,num_packets=0,chained; + int act_comp=0,num_packets=0,chained,dummy; stbi__pic_packet packets[10]; + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) { stbi__rewind(s); return 0; @@ -6766,7 +6792,7 @@ static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req *x = s->img_x; *y = s->img_y; - *comp = s->img_n; + if (comp) *comp = s->img_n; if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0)) return stbi__errpuc("too large", "PNM too large"); @@ -6820,16 +6846,20 @@ static int stbi__pnm_getinteger(stbi__context *s, char *c) static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp) { - int maxv; + int maxv, dummy; char c, p, t; - stbi__rewind( s ); + if (!x) x = &dummy; + if (!y) y = &dummy; + if (!comp) comp = &dummy; + + stbi__rewind(s); // Get identifier p = (char) stbi__get8(s); t = (char) stbi__get8(s); if (p != 'P' || (t != '5' && t != '6')) { - stbi__rewind( s ); + stbi__rewind(s); return 0; } @@ -6936,6 +6966,11 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int /* revision history: + 2.15 (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode; + warning fixes; disable run-time SSE detection on gcc; + uniform handling of optional "return" values; + thread-safe initialization of zlib tables + 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11 (2016-04-02) allocate large structures on the stack @@ -7097,3 +7132,46 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int 0.50 (2006-11-19) first released version */ + + +/* +------------------------------------------------------------------------------ +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. +------------------------------------------------------------------------------ +*/ diff --git a/stb_image_write.h b/stb_image_write.h @@ -1,4 +1,4 @@ -/* stb_image_write - v1.02 - public domain - http://nothings.org/stb/stb_image_write.h +/* 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 no warranty implied; use at your own risk @@ -103,12 +103,12 @@ CREDITS: Jonas Karlsson Filip Wasil Thatcher Ulrich + github:poppolopoppo + Patrick Boettcher LICENSE -This software is dual-licensed to the public domain and under the following -license: you are granted a perpetual, irrevocable license to copy, modify, -publish, and distribute this file as you see fit. + See end of file for license information. */ @@ -293,10 +293,8 @@ static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, in 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: - s->func(s->context,d,1); - break; - case 2: if (expand_mono) stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp else @@ -475,7 +473,6 @@ int stbi_write_tga(char const *filename, int x, int y, int comp, const void *dat // ************************************************************************************************* // Radiance RGBE HDR writer // by Baldur Karlsson -#ifndef STBI_WRITE_NO_STDIO #define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) @@ -630,6 +627,7 @@ int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, i return stbi_write_hdr_core(&s, x, y, comp, (float *) data); } +#ifndef STBI_WRITE_NO_STDIO int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) { stbi__write_context s; @@ -896,6 +894,7 @@ static unsigned char stbiw__paeth(int a, int b, int c) 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 }; @@ -912,10 +911,10 @@ unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, in 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) @@ -1017,6 +1016,9 @@ STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, #endif // STB_IMAGE_WRITE_IMPLEMENTATION /* Revision history + 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) @@ -1046,3 +1048,45 @@ STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, 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. +------------------------------------------------------------------------------ +*/ diff --git a/stb_perlin.h b/stb_perlin.h @@ -1,18 +1,16 @@ -// stb_perlin.h - v0.2 - perlin noise +// stb_perlin.h - v0.3 - perlin noise // public domain single-file C implementation by Sean Barrett // // LICENSE // -// This software is dual-licensed to the public domain and under the following -// license: you are granted a perpetual, irrevocable license to copy, modify, -// publish, and distribute this file as you see fit. +// See end of file. // // // to create the implementation, // #define STB_PERLIN_IMPLEMENTATION // in *one* C/CPP file that includes this file. - - +// +// // Documentation: // // float stb_perlin_noise3( float x, @@ -33,22 +31,55 @@ // 0 to mean "don't care". (The noise always wraps every 256 due // details of the implementation, even if you ask for larger or no // wrapping.) +// +// Fractal Noise: +// +// Three common fractal noise functions are included, which produce +// a wide variety of nice effects depending on the parameters +// provided. Note that each function will call stb_perlin_noise3 +// 'octaves' times, so this parameter will affect runtime. +// +// float stb_perlin_ridge_noise3(float x, float y, float z, +// float lacunarity, float gain, float offset, int octaves, +// int x_wrap, int y_wrap, int z_wrap); +// +// float stb_perlin_fbm_noise3(float x, float y, float z, +// float lacunarity, float gain, int octaves, +// int x_wrap, int y_wrap, int z_wrap); +// +// float stb_perlin_turbulence_noise3(float x, float y, float z, +// float lacunarity, float gain,int octaves, +// int x_wrap, int y_wrap, int z_wrap); +// +// Typical values to start playing with: +// octaves = 6 -- number of "octaves" of noise3() to sum +// lacunarity = ~ 2.0 -- spacing between successive octaves (use exactly 2.0 for wrapping output) +// gain = 0.5 -- relative weighting applied to each successive octave +// offset = 1.0? -- used to invert the ridges, may need to be larger, not sure +// +// +// Contributors: +// Jack Mott - additional noise functions +// #ifdef __cplusplus -extern "C" float stb_perlin_noise3(float x, float y, float z, int x_wrap=0, int y_wrap=0, int z_wrap=0); -#else +extern "C" { +#endif extern float stb_perlin_noise3(float x, float y, float z, int x_wrap, int y_wrap, int z_wrap); +extern float stb_perlin_ridge_noise3(float x, float y, float z,float lacunarity, float gain, float offset, int octaves,int x_wrap, int y_wrap, int z_wrap); +extern float stb_perlin_fbm_noise3(float x, float y, float z,float lacunarity, float gain, int octaves,int x_wrap, int y_wrap, int z_wrap); +extern float stb_perlin_turbulence_noise3(float x, float y, float z, float lacunarity, float gain, int octaves,int x_wrap, int y_wrap, int z_wrap); +#ifdef __cplusplus +} #endif #ifdef STB_PERLIN_IMPLEMENTATION -#include <math.h> // floor() - // not same permutation table as Perlin's reference to avoid copyright issues; // Perlin's table can be found at http://mrl.nyu.edu/~perlin/noise/ // @OPTIMIZE: should this be unsigned char instead of int for cache? -static int stb__perlin_randtab[512] = +static unsigned char stb__perlin_randtab[512] = { 23, 125, 161, 52, 103, 117, 70, 37, 247, 101, 203, 169, 124, 126, 44, 123, 152, 238, 145, 45, 171, 114, 253, 10, 192, 136, 4, 157, 249, 30, 35, 72, @@ -91,6 +122,12 @@ static float stb__perlin_lerp(float a, float b, float t) return a + (b-a) * t; } +static int stb__perlin_fastfloor(float a) +{ + int ai = (int) a; + return (a < ai) ? ai-1 : ai; +} + // different grad function from Perlin's, but easy to modify to match reference static float stb__perlin_grad(int hash, float x, float y, float z) { @@ -112,7 +149,7 @@ static float stb__perlin_grad(int hash, float x, float y, float z) // perlin's gradient has 12 cases so some get used 1/16th of the time // and some 2/16ths. We reduce bias by changing those fractions - // to 5/16ths and 6/16ths, and the same 4 cases get the extra weight. + // to 5/64ths and 6/64ths, and the same 4 cases get the extra weight. static unsigned char indices[64] = { 0,1,2,3,4,5,6,7,8,9,10,11, @@ -124,6 +161,7 @@ static float stb__perlin_grad(int hash, float x, float y, float z) }; // if you use reference permutation table, change 63 below to 15 to match reference + // (this is why the ordering of the table above is funky) float *grad = basis[indices[hash & 63]]; return grad[0]*x + grad[1]*y + grad[2]*z; } @@ -138,9 +176,9 @@ float stb_perlin_noise3(float x, float y, float z, int x_wrap, int y_wrap, int z unsigned int x_mask = (x_wrap-1) & 255; unsigned int y_mask = (y_wrap-1) & 255; unsigned int z_mask = (z_wrap-1) & 255; - int px = (int) floor(x); - int py = (int) floor(y); - int pz = (int) floor(z); + int px = stb__perlin_fastfloor(x); + int py = stb__perlin_fastfloor(y); + int pz = stb__perlin_fastfloor(z); int x0 = px & x_mask, x1 = (px+1) & x_mask; int y0 = py & y_mask, y1 = (py+1) & y_mask; int z0 = pz & z_mask, z1 = (pz+1) & z_mask; @@ -179,4 +217,100 @@ float stb_perlin_noise3(float x, float y, float z, int x_wrap, int y_wrap, int z return stb__perlin_lerp(n0,n1,u); } + +float stb_perlin_ridge_noise3(float x, float y, float z,float lacunarity, float gain, float offset, int octaves,int x_wrap, int y_wrap, int z_wrap) +{ + int i; + float frequency = 1.0f; + float prev = 1.0f; + float amplitude = 0.5f; + float sum = 0.0f; + + for (i = 0; i < octaves; i++) { + float r = (float)(stb_perlin_noise3(x*frequency,y*frequency,z*frequency,x_wrap,y_wrap,z_wrap)); + r = r<0 ? -r : r; // fabs() + r = offset - r; + r = r*r; + sum += r*amplitude*prev; + prev = r; + frequency *= lacunarity; + amplitude *= gain; + } + return sum; +} + +float stb_perlin_fbm_noise3(float x, float y, float z,float lacunarity, float gain, int octaves,int x_wrap, int y_wrap, int z_wrap) +{ + int i; + float frequency = 1.0f; + float amplitude = 1.0f; + float sum = 0.0f; + + for (i = 0; i < octaves; i++) { + sum += stb_perlin_noise3(x*frequency,y*frequency,z*frequency,x_wrap,y_wrap,z_wrap)*amplitude; + frequency *= lacunarity; + amplitude *= gain; + } + return sum; +} + +float stb_perlin_turbulence_noise3(float x, float y, float z, float lacunarity, float gain, int octaves,int x_wrap, int y_wrap, int z_wrap) +{ + int i; + float frequency = 1.0f; + float amplitude = 1.0f; + float sum = 0.0f; + + for (i = 0; i < octaves; i++) { + float r = stb_perlin_noise3(x*frequency,y*frequency,z*frequency,x_wrap,y_wrap,z_wrap)*amplitude; + r = r<0 ? -r : r; // fabs() + sum += r; + frequency *= lacunarity; + amplitude *= gain; + } + return sum; +} + #endif // STB_PERLIN_IMPLEMENTATION + +/* +------------------------------------------------------------------------------ +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. +------------------------------------------------------------------------------ +*/