[520] | 1 | // Copyright (C) 2015-2016 ChaosForge Ltd
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| 2 | // http://chaosforge.org/
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| 3 | //
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| 4 | // This file is part of Nova libraries.
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| 5 | // For conditions of distribution and use, see copying.txt file in root folder.
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| 6 |
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| 7 | #include "nv/image/png_writer.hh"
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| 8 |
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| 9 | #include "nv/image/miniz.hh"
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| 10 |
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| 11 | // TODO: remove
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| 12 | #include <stdarg.h>
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| 13 |
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[551] | 14 | //using namespace nv;
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[520] | 15 |
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| 16 | #if NV_COMPILER == NV_CLANG
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| 17 | #pragma clang diagnostic ignored "-Wunused-macros"
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| 18 | #pragma clang diagnostic ignored "-Wold-style-cast"
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| 19 | #pragma clang diagnostic ignored "-Wsign-conversion"
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| 20 | #pragma clang diagnostic ignored "-Wreserved-id-macro"
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| 21 | #pragma clang diagnostic ignored "-Wmissing-prototypes"
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| 22 | #define NULL 0
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| 23 | #endif
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| 24 |
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| 25 | enum
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| 26 | {
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| 27 | STBI_default = 0, // only used for req_comp
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| 28 |
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| 29 | STBI_grey = 1,
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| 30 | STBI_grey_alpha = 2,
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| 31 | STBI_rgb = 3,
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| 32 | STBI_rgb_alpha = 4
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| 33 | };
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| 34 |
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[551] | 35 | #define STBI_MALLOC(sz) nv::nvmalloc(sz)
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| 36 | #define STBI_REALLOC(p,sz) nv::nvrealloc(p,sz)
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| 37 | #define STBI_FREE(p) nv::nvfree(p)
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| 38 | #define STBI_MEMMOVE(d,s,c) nv::nvmemmove(d,s,c)
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[520] | 39 |
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| 40 | typedef void stbi_write_func( void *context, void *data, int size );
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| 41 |
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| 42 | typedef struct
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| 43 | {
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| 44 | stbi_write_func *func;
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| 45 | void *context;
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| 46 | } stbi__write_context;
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| 47 |
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| 48 | // initialize a callback-based context
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[529] | 49 | // static void stbi__start_write_callbacks( stbi__write_context *s, stbi_write_func *c, void *context )
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| 50 | // {
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| 51 | // s->func = c;
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| 52 | // s->context = context;
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| 53 | // }
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[520] | 54 |
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| 55 | typedef unsigned int stbiw_uint32;
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| 56 | typedef int stb_image_write_test[sizeof( stbiw_uint32 ) == 4 ? 1 : -1];
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| 57 |
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| 58 | template < typename T >
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[551] | 59 | inline nv::uchar8 byte_cast( T x )
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[520] | 60 | {
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[551] | 61 | return nv::uchar8( ( x ) & 255 );
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[520] | 62 | }
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| 63 |
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| 64 | #define stbi__err(x,y) 0
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| 65 | #define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
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| 66 |
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[529] | 67 | /*
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[520] | 68 | static void stbiw__writefv( stbi__write_context *s, const char *fmt, va_list v )
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| 69 | {
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| 70 | while ( *fmt )
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| 71 | {
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| 72 | switch ( *fmt++ )
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| 73 | {
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| 74 | case ' ': break;
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| 75 | case '1': { unsigned char x = byte_cast( va_arg( v, int ) );
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| 76 | s->func( s->context, &x, 1 );
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| 77 | break; }
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| 78 | case '2': { int x = va_arg( v, int );
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| 79 | unsigned char b[2];
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| 80 | b[0] = byte_cast( x );
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| 81 | b[1] = byte_cast( x >> 8 );
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| 82 | s->func( s->context, b, 2 );
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| 83 | break; }
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| 84 | case '4': { stbiw_uint32 x = va_arg( v, int );
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| 85 | unsigned char b[4];
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| 86 | b[0] = byte_cast( x );
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| 87 | b[1] = byte_cast( x >> 8 );
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| 88 | b[2] = byte_cast( x >> 16 );
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| 89 | b[3] = byte_cast( x >> 24 );
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| 90 | s->func( s->context, b, 4 );
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| 91 | break; }
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| 92 | default:
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| 93 | byte_cast( 0 );
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| 94 | return;
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| 95 | }
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| 96 | }
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| 97 | }
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| 98 |
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| 99 | static void stbiw__writef( stbi__write_context *s, const char *fmt, ... )
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| 100 | {
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| 101 | va_list v;
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| 102 | va_start( v, fmt );
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| 103 | stbiw__writefv( s, fmt, v );
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| 104 | va_end( v );
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| 105 | }
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| 106 |
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| 107 | static void stbiw__write3( stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c )
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| 108 | {
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| 109 | unsigned char arr[3];
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| 110 | arr[0] = a, arr[1] = b, arr[2] = c;
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| 111 | s->func( s->context, arr, 3 );
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| 112 | }
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| 113 |
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| 114 | static void stbiw__write_pixel( stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d )
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| 115 | {
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| 116 | unsigned char bg[3] = { 255, 0, 255 }, px[3];
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| 117 | int k;
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| 118 |
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| 119 | if ( write_alpha < 0 )
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| 120 | s->func( s->context, &d[comp - 1], 1 );
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| 121 |
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| 122 | switch ( comp )
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| 123 | {
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| 124 | case 1:
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| 125 | s->func( s->context, d, 1 );
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| 126 | break;
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| 127 | case 2:
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| 128 | if ( expand_mono )
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| 129 | stbiw__write3( s, d[0], d[0], d[0] ); // monochrome bmp
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| 130 | else
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| 131 | s->func( s->context, d, 1 ); // monochrome TGA
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| 132 | break;
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| 133 | case 4:
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| 134 | if ( !write_alpha )
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| 135 | {
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| 136 | // composite against pink background
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| 137 | for ( k = 0; k < 3; ++k )
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| 138 | px[k] = bg[k] + ( ( d[k] - bg[k] ) * d[3] ) / 255;
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| 139 | stbiw__write3( s, px[1 - rgb_dir], px[1], px[1 + rgb_dir] );
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| 140 | break;
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| 141 | }
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[529] | 142 | // FALLTHROUGH
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[520] | 143 | case 3:
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| 144 | stbiw__write3( s, d[1 - rgb_dir], d[1], d[1 + rgb_dir] );
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| 145 | break;
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| 146 | }
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| 147 | if ( write_alpha > 0 )
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| 148 | s->func( s->context, &d[comp - 1], 1 );
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| 149 | }
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| 150 |
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| 151 | 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 )
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| 152 | {
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| 153 | stbiw_uint32 zero = 0;
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| 154 | int i, j, j_end;
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| 155 |
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| 156 | if ( y <= 0 )
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| 157 | return;
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| 158 |
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| 159 | if ( vdir < 0 )
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| 160 | j_end = -1, j = y - 1;
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| 161 | else
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| 162 | j_end = y, j = 0;
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| 163 |
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| 164 | for ( ; j != j_end; j += vdir )
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| 165 | {
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| 166 | for ( i = 0; i < x; ++i )
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| 167 | {
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| 168 | unsigned char *d = (unsigned char *)data + ( j*x + i )*comp;
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| 169 | stbiw__write_pixel( s, rgb_dir, comp, write_alpha, expand_mono, d );
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| 170 | }
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| 171 | s->func( s->context, &zero, scanline_pad );
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| 172 | }
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| 173 | }
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| 174 |
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| 175 | 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, ... )
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| 176 | {
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| 177 | if ( y < 0 || x < 0 )
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| 178 | {
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| 179 | return 0;
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| 180 | }
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| 181 | else
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| 182 | {
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| 183 | va_list v;
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| 184 | va_start( v, fmt );
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| 185 | stbiw__writefv( s, fmt, v );
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| 186 | va_end( v );
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| 187 | stbiw__write_pixels( s, rgb_dir, vdir, x, y, comp, data, alpha, pad, expand_mono );
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| 188 | return 1;
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| 189 | }
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| 190 | }
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[529] | 191 | */
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[520] | 192 |
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| 193 | static unsigned int stbiw__crc32( unsigned char *buffer, int len )
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| 194 | {
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| 195 | static unsigned int crc_table[256] =
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| 196 | {
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| 197 | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
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| 198 | 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
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| 199 | 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
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| 200 | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
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| 201 | 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
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| 202 | 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
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| 203 | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
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| 204 | 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
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| 205 | 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
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| 206 | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
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| 207 | 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
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| 208 | 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
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| 209 | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
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| 210 | 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
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| 211 | 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
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| 212 | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
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| 213 | 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
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| 214 | 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
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| 215 | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
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| 216 | 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
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| 217 | 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
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| 218 | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
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| 219 | 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
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| 220 | 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
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| 221 | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
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| 222 | 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
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| 223 | 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
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| 224 | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
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| 225 | 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
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| 226 | 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
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| 227 | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
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| 228 | 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
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| 229 | };
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| 230 |
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| 231 | unsigned int crc = ~0u;
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| 232 | int i;
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| 233 | for ( i = 0; i < len; ++i )
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| 234 | crc = ( crc >> 8 ) ^ crc_table[buffer[i] ^ ( crc & 0xff )];
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| 235 | return ~crc;
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| 236 | }
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| 237 |
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| 238 | #define stbiw__wpng4(o,a,b,c,d) ((o)[0]=byte_cast(a),(o)[1]=byte_cast(b),(o)[2]=byte_cast(c),(o)[3]=byte_cast(d),(o)+=4)
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| 239 | #define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v));
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| 240 | #define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3])
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| 241 |
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| 242 | static void stbiw__wpcrc( unsigned char **data, int len )
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| 243 | {
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| 244 | unsigned int crc = stbiw__crc32( *data - len - 4, len + 4 );
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| 245 | stbiw__wp32( *data, crc );
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| 246 | }
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| 247 |
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[551] | 248 | static int iabs( int i )
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| 249 | {
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| 250 | return i >= 0 ? i : -i;
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| 251 | }
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| 252 |
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[520] | 253 | static unsigned char stbiw__paeth( int a, int b, int c )
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| 254 | {
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[551] | 255 | int p = a + b - c, pa = iabs( p - a ), pb = iabs( p - b ), pc = iabs( p - c );
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[520] | 256 | if ( pa <= pb && pa <= pc ) return byte_cast( a );
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| 257 | if ( pb <= pc ) return byte_cast( b );
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| 258 | return byte_cast( c );
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| 259 | }
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| 260 |
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[529] | 261 | unsigned char * stbi_zlib_compress( unsigned char *data, int data_len, int *out_len, int /*quality*/ )
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[520] | 262 | {
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| 263 | unsigned long expected = nv::miniz_bound( data_len );
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| 264 | unsigned char* result = (unsigned char *)STBI_MALLOC( expected );
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| 265 | unsigned long rlen = expected;
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| 266 | nv::miniz_compress( result, &rlen, data, data_len, 6 );
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| 267 | *out_len = rlen;
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| 268 | return result;
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| 269 | }
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| 270 |
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| 271 | unsigned char *stbi_write_png_to_mem( const unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len )
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| 272 | {
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| 273 | int ctype[5] = { -1, 0, 4, 2, 6 };
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| 274 | unsigned char sig[8] = { 137,80,78,71,13,10,26,10 };
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| 275 | unsigned char *out, *o, *filt, *zlib;
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| 276 | signed char *line_buffer;
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| 277 | int i, j, k, p, zlen;
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| 278 |
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| 279 | if ( stride_bytes == 0 )
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| 280 | stride_bytes = x * n;
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| 281 |
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| 282 | filt = (unsigned char *)STBI_MALLOC( ( x*n + 1 ) * y ); if ( !filt ) return 0;
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| 283 | line_buffer = (signed char *)STBI_MALLOC( x * n ); if ( !line_buffer ) { STBI_FREE( filt ); return 0; }
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| 284 |
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| 285 | bool flip_y = true;
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| 286 |
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| 287 | for ( j = 0; j < y; ++j )
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| 288 | {
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| 289 | int line = flip_y ? y - j - 1 : j;
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| 290 | int step = flip_y ? -stride_bytes : stride_bytes;
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| 291 | static int mapping[] = { 0,1,2,3,4 };
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| 292 | static int firstmap[] = { 0,1,0,5,6 };
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| 293 | int *mymap = j ? mapping : firstmap;
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| 294 | int best = 0, bestval = 0x7fffffff;
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| 295 | for ( p = 0; p < 2; ++p )
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| 296 | {
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| 297 | for ( k = p ? best : 0; k < 5; ++k )
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| 298 | {
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| 299 | int type = mymap[k], est = 0;
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| 300 | const unsigned char *z = pixels + stride_bytes*line;
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| 301 | for ( i = 0; i < n; ++i )
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| 302 | switch ( type )
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| 303 | {
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| 304 | case 0: line_buffer[i] = z[i]; break;
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| 305 | case 1: line_buffer[i] = z[i]; break;
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| 306 | case 2: line_buffer[i] = z[i] - z[i - step]; break;
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| 307 | case 3: line_buffer[i] = z[i] - ( z[i - step] >> 1 ); break;
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| 308 | case 4: line_buffer[i] = (signed char)( z[i] - stbiw__paeth( 0, z[i - step], 0 ) ); break;
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| 309 | case 5: line_buffer[i] = z[i]; break;
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| 310 | case 6: line_buffer[i] = z[i]; break;
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| 311 | }
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| 312 | for ( i = n; i < x*n; ++i )
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| 313 | {
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| 314 | switch ( type )
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| 315 | {
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| 316 | case 0: line_buffer[i] = z[i]; break;
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| 317 | case 1: line_buffer[i] = z[i] - z[i - n]; break;
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| 318 | case 2: line_buffer[i] = z[i] - z[i - step]; break;
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| 319 | case 3: line_buffer[i] = z[i] - ( ( z[i - n] + z[i - step] ) >> 1 ); break;
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| 320 | case 4: line_buffer[i] = z[i] - stbiw__paeth( z[i - n], z[i - step], z[i - step - n] ); break;
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| 321 | case 5: line_buffer[i] = z[i] - ( z[i - n] >> 1 ); break;
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| 322 | case 6: line_buffer[i] = z[i] - stbiw__paeth( z[i - n], 0, 0 ); break;
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| 323 | }
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| 324 | }
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| 325 | if ( p ) break;
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| 326 | for ( i = 0; i < x*n; ++i )
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[551] | 327 | est += iabs( (signed char)line_buffer[i] );
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[520] | 328 | if ( est < bestval ) { bestval = est; best = k; }
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| 329 | }
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| 330 | }
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| 331 | // when we get here, best contains the filter type, and line_buffer contains the data
|
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| 332 | //line = j;
|
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| 333 | filt[j*( x*n + 1 )] = (unsigned char)best;
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| 334 | STBI_MEMMOVE( filt + j*( x*n + 1 ) + 1, line_buffer, x*n );
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| 335 | }
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| 336 | STBI_FREE( line_buffer );
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| 337 | zlib = stbi_zlib_compress( filt, y*( x*n + 1 ), &zlen, 8 ); // increase 8 to get smaller but use more memory
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| 338 | STBI_FREE( filt );
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| 339 | if ( !zlib ) return 0;
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| 340 |
|
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| 341 | // each tag requires 12 bytes of overhead
|
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| 342 | out = (unsigned char *)STBI_MALLOC( 8 + 12 + 13 + 12 + zlen + 12 );
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| 343 | if ( !out ) return 0;
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| 344 | *out_len = 8 + 12 + 13 + 12 + zlen + 12;
|
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| 345 |
|
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| 346 | o = out;
|
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| 347 | STBI_MEMMOVE( o, sig, 8 ); o += 8;
|
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| 348 | stbiw__wp32( o, 13 ); // header length
|
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| 349 | stbiw__wptag( o, "IHDR" );
|
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| 350 | stbiw__wp32( o, x );
|
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| 351 | stbiw__wp32( o, y );
|
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| 352 | *o++ = 8;
|
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| 353 | *o++ = byte_cast( ctype[n] );
|
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| 354 | *o++ = 0;
|
---|
| 355 | *o++ = 0;
|
---|
| 356 | *o++ = 0;
|
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| 357 | stbiw__wpcrc( &o, 13 );
|
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| 358 |
|
---|
| 359 | stbiw__wp32( o, zlen );
|
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| 360 | stbiw__wptag( o, "IDAT" );
|
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| 361 | STBI_MEMMOVE( o, zlib, zlen );
|
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| 362 | o += zlen;
|
---|
| 363 | STBI_FREE( zlib );
|
---|
| 364 | stbiw__wpcrc( &o, zlen );
|
---|
| 365 |
|
---|
| 366 | stbiw__wp32( o, 0 );
|
---|
| 367 | stbiw__wptag( o, "IEND" );
|
---|
| 368 | stbiw__wpcrc( &o, 0 );
|
---|
| 369 |
|
---|
| 370 | NV_ASSERT( o == out + *out_len, "wrong output" );
|
---|
| 371 |
|
---|
| 372 | return out;
|
---|
| 373 | }
|
---|
| 374 |
|
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| 375 | bool nv::png_writer::save( stream& s, image_data* data )
|
---|
| 376 | {
|
---|
| 377 | ivec2 sz = data->get_size();
|
---|
| 378 | int len = 0;
|
---|
[534] | 379 | unsigned char* out = stbi_write_png_to_mem( data->get_data(), 0, sz.x, sz.y, (int)data->get_depth(), &len );
|
---|
[520] | 380 | if ( !out ) return false;
|
---|
| 381 | s.write( out, 1, len );
|
---|
| 382 | STBI_FREE( out );
|
---|
| 383 | return true;
|
---|
| 384 | }
|
---|