[93] | 1 |
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| 2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers)
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| 3 | *
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| 4 | * Last changed in libpng 1.2.13 November 13, 2006
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| 5 | * For conditions of distribution and use, see copyright notice in png.h
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| 6 | * Copyright (c) 1998-2006 Glenn Randers-Pehrson
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| 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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| 9 | */
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| 10 |
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| 11 | #define PNG_INTERNAL
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| 12 | #include "png.h"
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| 13 |
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| 14 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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| 15 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
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| 16 | /* turn on BGR-to-RGB mapping */
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| 17 | void PNGAPI
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| 18 | png_set_bgr(png_structp png_ptr)
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| 19 | {
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| 20 | png_debug(1, "in png_set_bgr\n");
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| 21 | if(png_ptr == NULL) return;
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| 22 | png_ptr->transformations |= PNG_BGR;
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| 23 | }
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| 24 | #endif
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| 25 |
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| 26 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
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| 27 | /* turn on 16 bit byte swapping */
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| 28 | void PNGAPI
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| 29 | png_set_swap(png_structp png_ptr)
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| 30 | {
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| 31 | png_debug(1, "in png_set_swap\n");
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| 32 | if(png_ptr == NULL) return;
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| 33 | if (png_ptr->bit_depth == 16)
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| 34 | png_ptr->transformations |= PNG_SWAP_BYTES;
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| 35 | }
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| 36 | #endif
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| 37 |
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| 38 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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| 39 | /* turn on pixel packing */
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| 40 | void PNGAPI
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| 41 | png_set_packing(png_structp png_ptr)
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| 42 | {
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| 43 | png_debug(1, "in png_set_packing\n");
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| 44 | if(png_ptr == NULL) return;
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| 45 | if (png_ptr->bit_depth < 8)
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| 46 | {
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| 47 | png_ptr->transformations |= PNG_PACK;
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| 48 | png_ptr->usr_bit_depth = 8;
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| 49 | }
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| 50 | }
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| 51 | #endif
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| 52 |
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| 53 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
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| 54 | /* turn on packed pixel swapping */
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| 55 | void PNGAPI
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| 56 | png_set_packswap(png_structp png_ptr)
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| 57 | {
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| 58 | png_debug(1, "in png_set_packswap\n");
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| 59 | if(png_ptr == NULL) return;
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| 60 | if (png_ptr->bit_depth < 8)
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| 61 | png_ptr->transformations |= PNG_PACKSWAP;
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| 62 | }
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| 63 | #endif
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| 64 |
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| 65 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
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| 66 | void PNGAPI
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| 67 | png_set_shift(png_structp png_ptr, png_color_8p true_bits)
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| 68 | {
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| 69 | png_debug(1, "in png_set_shift\n");
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| 70 | if(png_ptr == NULL) return;
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| 71 | png_ptr->transformations |= PNG_SHIFT;
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| 72 | png_ptr->shift = *true_bits;
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| 73 | }
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| 74 | #endif
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| 75 |
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| 76 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
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| 77 | defined(PNG_WRITE_INTERLACING_SUPPORTED)
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| 78 | int PNGAPI
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| 79 | png_set_interlace_handling(png_structp png_ptr)
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| 80 | {
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| 81 | png_debug(1, "in png_set_interlace handling\n");
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| 82 | if (png_ptr && png_ptr->interlaced)
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| 83 | {
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| 84 | png_ptr->transformations |= PNG_INTERLACE;
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| 85 | return (7);
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| 86 | }
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| 87 |
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| 88 | return (1);
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| 89 | }
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| 90 | #endif
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| 91 |
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| 92 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
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| 93 | /* Add a filler byte on read, or remove a filler or alpha byte on write.
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| 94 | * The filler type has changed in v0.95 to allow future 2-byte fillers
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| 95 | * for 48-bit input data, as well as to avoid problems with some compilers
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| 96 | * that don't like bytes as parameters.
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| 97 | */
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| 98 | void PNGAPI
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| 99 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
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| 100 | {
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| 101 | png_debug(1, "in png_set_filler\n");
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| 102 | if(png_ptr == NULL) return;
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| 103 | png_ptr->transformations |= PNG_FILLER;
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| 104 | png_ptr->filler = (png_byte)filler;
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| 105 | if (filler_loc == PNG_FILLER_AFTER)
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| 106 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
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| 107 | else
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| 108 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
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| 109 |
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| 110 | /* This should probably go in the "do_read_filler" routine.
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| 111 | * I attempted to do that in libpng-1.0.1a but that caused problems
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| 112 | * so I restored it in libpng-1.0.2a
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| 113 | */
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| 114 |
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| 115 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
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| 116 | {
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| 117 | png_ptr->usr_channels = 4;
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| 118 | }
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| 119 |
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| 120 | /* Also I added this in libpng-1.0.2a (what happens when we expand
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| 121 | * a less-than-8-bit grayscale to GA? */
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| 122 |
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| 123 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
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| 124 | {
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| 125 | png_ptr->usr_channels = 2;
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| 126 | }
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| 127 | }
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| 128 |
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| 129 | #if !defined(PNG_1_0_X)
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| 130 | /* Added to libpng-1.2.7 */
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| 131 | void PNGAPI
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| 132 | png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
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| 133 | {
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| 134 | png_debug(1, "in png_set_add_alpha\n");
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| 135 | if(png_ptr == NULL) return;
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| 136 | png_set_filler(png_ptr, filler, filler_loc);
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| 137 | png_ptr->transformations |= PNG_ADD_ALPHA;
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| 138 | }
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| 139 | #endif
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| 140 |
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| 141 | #endif
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| 142 |
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| 143 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
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| 144 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
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| 145 | void PNGAPI
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| 146 | png_set_swap_alpha(png_structp png_ptr)
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| 147 | {
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| 148 | png_debug(1, "in png_set_swap_alpha\n");
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| 149 | if(png_ptr == NULL) return;
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| 150 | png_ptr->transformations |= PNG_SWAP_ALPHA;
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| 151 | }
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| 152 | #endif
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| 153 |
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| 154 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
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| 155 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
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| 156 | void PNGAPI
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| 157 | png_set_invert_alpha(png_structp png_ptr)
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| 158 | {
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| 159 | png_debug(1, "in png_set_invert_alpha\n");
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| 160 | if(png_ptr == NULL) return;
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| 161 | png_ptr->transformations |= PNG_INVERT_ALPHA;
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| 162 | }
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| 163 | #endif
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| 164 |
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| 165 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
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| 166 | void PNGAPI
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| 167 | png_set_invert_mono(png_structp png_ptr)
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| 168 | {
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| 169 | png_debug(1, "in png_set_invert_mono\n");
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| 170 | if(png_ptr == NULL) return;
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| 171 | png_ptr->transformations |= PNG_INVERT_MONO;
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| 172 | }
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| 173 |
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| 174 | /* invert monochrome grayscale data */
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| 175 | void /* PRIVATE */
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| 176 | png_do_invert(png_row_infop row_info, png_bytep row)
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| 177 | {
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| 178 | png_debug(1, "in png_do_invert\n");
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| 179 | /* This test removed from libpng version 1.0.13 and 1.2.0:
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| 180 | * if (row_info->bit_depth == 1 &&
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| 181 | */
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| 182 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
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| 183 | if (row == NULL || row_info == NULL)
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| 184 | return;
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| 185 | #endif
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| 186 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
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| 187 | {
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| 188 | png_bytep rp = row;
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| 189 | png_uint_32 i;
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| 190 | png_uint_32 istop = row_info->rowbytes;
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| 191 |
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| 192 | for (i = 0; i < istop; i++)
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| 193 | {
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| 194 | *rp = (png_byte)(~(*rp));
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| 195 | rp++;
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| 196 | }
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| 197 | }
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| 198 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
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| 199 | row_info->bit_depth == 8)
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| 200 | {
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| 201 | png_bytep rp = row;
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| 202 | png_uint_32 i;
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| 203 | png_uint_32 istop = row_info->rowbytes;
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| 204 |
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| 205 | for (i = 0; i < istop; i+=2)
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| 206 | {
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| 207 | *rp = (png_byte)(~(*rp));
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| 208 | rp+=2;
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| 209 | }
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| 210 | }
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| 211 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
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| 212 | row_info->bit_depth == 16)
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| 213 | {
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| 214 | png_bytep rp = row;
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| 215 | png_uint_32 i;
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| 216 | png_uint_32 istop = row_info->rowbytes;
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| 217 |
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| 218 | for (i = 0; i < istop; i+=4)
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| 219 | {
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| 220 | *rp = (png_byte)(~(*rp));
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| 221 | *(rp+1) = (png_byte)(~(*(rp+1)));
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| 222 | rp+=4;
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| 223 | }
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| 224 | }
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| 225 | }
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| 226 | #endif
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| 227 |
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| 228 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
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| 229 | /* swaps byte order on 16 bit depth images */
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| 230 | void /* PRIVATE */
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| 231 | png_do_swap(png_row_infop row_info, png_bytep row)
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| 232 | {
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| 233 | png_debug(1, "in png_do_swap\n");
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| 234 | if (
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| 235 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
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| 236 | row != NULL && row_info != NULL &&
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| 237 | #endif
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| 238 | row_info->bit_depth == 16)
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| 239 | {
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| 240 | png_bytep rp = row;
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| 241 | png_uint_32 i;
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| 242 | png_uint_32 istop= row_info->width * row_info->channels;
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| 243 |
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| 244 | for (i = 0; i < istop; i++, rp += 2)
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| 245 | {
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| 246 | png_byte t = *rp;
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| 247 | *rp = *(rp + 1);
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| 248 | *(rp + 1) = t;
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| 249 | }
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| 250 | }
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| 251 | }
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| 252 | #endif
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| 253 |
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| 254 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
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| 255 | // BT: removed PNG_CONST, since const was already present
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| 256 | const static png_byte onebppswaptable[256] = {
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| 257 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
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| 258 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
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| 259 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
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| 260 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
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| 261 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
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| 262 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
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| 263 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
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| 264 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
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| 265 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
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| 266 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
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| 267 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
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| 268 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
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| 269 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
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| 270 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
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| 271 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
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| 272 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
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| 273 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
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| 274 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
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| 275 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
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| 276 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
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| 277 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
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| 278 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
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| 279 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
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| 280 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
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| 281 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
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| 282 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
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| 283 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
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| 284 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
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| 285 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
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| 286 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
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| 287 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
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| 288 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
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| 289 | };
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| 290 |
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| 291 | // BT: removed PNG_CONST, since const was already present
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| 292 | const static png_byte twobppswaptable[256] = {
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| 293 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
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| 294 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
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| 295 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
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| 296 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,
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| 297 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,
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| 298 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,
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| 299 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,
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| 300 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,
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| 301 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,
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| 302 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,
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| 303 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,
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| 304 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,
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| 305 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,
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| 306 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,
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| 307 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,
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| 308 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,
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| 309 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,
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| 310 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,
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| 311 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,
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| 312 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,
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| 313 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,
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| 314 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,
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| 315 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,
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| 316 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,
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| 317 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,
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| 318 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,
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| 319 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,
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| 320 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,
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| 321 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,
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| 322 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,
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| 323 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,
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| 324 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
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| 325 | };
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| 326 |
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| 327 | // BT: removed PNG_CONST, since const was already present
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| 328 | const static png_byte fourbppswaptable[256] = {
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| 329 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
|
---|
| 330 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
|
---|
| 331 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
|
---|
| 332 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,
|
---|
| 333 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,
|
---|
| 334 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,
|
---|
| 335 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,
|
---|
| 336 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,
|
---|
| 337 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,
|
---|
| 338 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,
|
---|
| 339 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,
|
---|
| 340 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,
|
---|
| 341 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,
|
---|
| 342 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,
|
---|
| 343 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,
|
---|
| 344 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,
|
---|
| 345 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,
|
---|
| 346 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,
|
---|
| 347 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,
|
---|
| 348 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,
|
---|
| 349 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,
|
---|
| 350 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,
|
---|
| 351 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,
|
---|
| 352 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,
|
---|
| 353 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,
|
---|
| 354 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,
|
---|
| 355 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,
|
---|
| 356 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,
|
---|
| 357 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,
|
---|
| 358 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,
|
---|
| 359 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,
|
---|
| 360 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
|
---|
| 361 | };
|
---|
| 362 |
|
---|
| 363 | /* swaps pixel packing order within bytes */
|
---|
| 364 | void /* PRIVATE */
|
---|
| 365 | png_do_packswap(png_row_infop row_info, png_bytep row)
|
---|
| 366 | {
|
---|
| 367 | png_debug(1, "in png_do_packswap\n");
|
---|
| 368 | if (
|
---|
| 369 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
|
---|
| 370 | row != NULL && row_info != NULL &&
|
---|
| 371 | #endif
|
---|
| 372 | row_info->bit_depth < 8)
|
---|
| 373 | {
|
---|
| 374 | png_bytep rp, end, table;
|
---|
| 375 |
|
---|
| 376 | end = row + row_info->rowbytes;
|
---|
| 377 |
|
---|
| 378 | if (row_info->bit_depth == 1)
|
---|
| 379 | table = (png_bytep)onebppswaptable;
|
---|
| 380 | else if (row_info->bit_depth == 2)
|
---|
| 381 | table = (png_bytep)twobppswaptable;
|
---|
| 382 | else if (row_info->bit_depth == 4)
|
---|
| 383 | table = (png_bytep)fourbppswaptable;
|
---|
| 384 | else
|
---|
| 385 | return;
|
---|
| 386 |
|
---|
| 387 | for (rp = row; rp < end; rp++)
|
---|
| 388 | *rp = table[*rp];
|
---|
| 389 | }
|
---|
| 390 | }
|
---|
| 391 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */
|
---|
| 392 |
|
---|
| 393 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
---|
| 394 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
---|
| 395 | /* remove filler or alpha byte(s) */
|
---|
| 396 | void /* PRIVATE */
|
---|
| 397 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
|
---|
| 398 | {
|
---|
| 399 | png_debug(1, "in png_do_strip_filler\n");
|
---|
| 400 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
|
---|
| 401 | if (row != NULL && row_info != NULL)
|
---|
| 402 | #endif
|
---|
| 403 | {
|
---|
| 404 | png_bytep sp=row;
|
---|
| 405 | png_bytep dp=row;
|
---|
| 406 | png_uint_32 row_width=row_info->width;
|
---|
| 407 | png_uint_32 i;
|
---|
| 408 |
|
---|
| 409 | if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
|
---|
| 410 | (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
|
---|
| 411 | (flags & PNG_FLAG_STRIP_ALPHA))) &&
|
---|
| 412 | row_info->channels == 4)
|
---|
| 413 | {
|
---|
| 414 | if (row_info->bit_depth == 8)
|
---|
| 415 | {
|
---|
| 416 | /* This converts from RGBX or RGBA to RGB */
|
---|
| 417 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
| 418 | {
|
---|
| 419 | dp+=3; sp+=4;
|
---|
| 420 | for (i = 1; i < row_width; i++)
|
---|
| 421 | {
|
---|
| 422 | *dp++ = *sp++;
|
---|
| 423 | *dp++ = *sp++;
|
---|
| 424 | *dp++ = *sp++;
|
---|
| 425 | sp++;
|
---|
| 426 | }
|
---|
| 427 | }
|
---|
| 428 | /* This converts from XRGB or ARGB to RGB */
|
---|
| 429 | else
|
---|
| 430 | {
|
---|
| 431 | for (i = 0; i < row_width; i++)
|
---|
| 432 | {
|
---|
| 433 | sp++;
|
---|
| 434 | *dp++ = *sp++;
|
---|
| 435 | *dp++ = *sp++;
|
---|
| 436 | *dp++ = *sp++;
|
---|
| 437 | }
|
---|
| 438 | }
|
---|
| 439 | row_info->pixel_depth = 24;
|
---|
| 440 | row_info->rowbytes = row_width * 3;
|
---|
| 441 | }
|
---|
| 442 | else /* if (row_info->bit_depth == 16) */
|
---|
| 443 | {
|
---|
| 444 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
| 445 | {
|
---|
| 446 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
|
---|
| 447 | sp += 8; dp += 6;
|
---|
| 448 | for (i = 1; i < row_width; i++)
|
---|
| 449 | {
|
---|
| 450 | /* This could be (although png_memcpy is probably slower):
|
---|
| 451 | png_memcpy(dp, sp, 6);
|
---|
| 452 | sp += 8;
|
---|
| 453 | dp += 6;
|
---|
| 454 | */
|
---|
| 455 |
|
---|
| 456 | *dp++ = *sp++;
|
---|
| 457 | *dp++ = *sp++;
|
---|
| 458 | *dp++ = *sp++;
|
---|
| 459 | *dp++ = *sp++;
|
---|
| 460 | *dp++ = *sp++;
|
---|
| 461 | *dp++ = *sp++;
|
---|
| 462 | sp += 2;
|
---|
| 463 | }
|
---|
| 464 | }
|
---|
| 465 | else
|
---|
| 466 | {
|
---|
| 467 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
|
---|
| 468 | for (i = 0; i < row_width; i++)
|
---|
| 469 | {
|
---|
| 470 | /* This could be (although png_memcpy is probably slower):
|
---|
| 471 | png_memcpy(dp, sp, 6);
|
---|
| 472 | sp += 8;
|
---|
| 473 | dp += 6;
|
---|
| 474 | */
|
---|
| 475 |
|
---|
| 476 | sp+=2;
|
---|
| 477 | *dp++ = *sp++;
|
---|
| 478 | *dp++ = *sp++;
|
---|
| 479 | *dp++ = *sp++;
|
---|
| 480 | *dp++ = *sp++;
|
---|
| 481 | *dp++ = *sp++;
|
---|
| 482 | *dp++ = *sp++;
|
---|
| 483 | }
|
---|
| 484 | }
|
---|
| 485 | row_info->pixel_depth = 48;
|
---|
| 486 | row_info->rowbytes = row_width * 6;
|
---|
| 487 | }
|
---|
| 488 | row_info->channels = 3;
|
---|
| 489 | }
|
---|
| 490 | else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||
|
---|
| 491 | (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
|
---|
| 492 | (flags & PNG_FLAG_STRIP_ALPHA))) &&
|
---|
| 493 | row_info->channels == 2)
|
---|
| 494 | {
|
---|
| 495 | if (row_info->bit_depth == 8)
|
---|
| 496 | {
|
---|
| 497 | /* This converts from GX or GA to G */
|
---|
| 498 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
| 499 | {
|
---|
| 500 | for (i = 0; i < row_width; i++)
|
---|
| 501 | {
|
---|
| 502 | *dp++ = *sp++;
|
---|
| 503 | sp++;
|
---|
| 504 | }
|
---|
| 505 | }
|
---|
| 506 | /* This converts from XG or AG to G */
|
---|
| 507 | else
|
---|
| 508 | {
|
---|
| 509 | for (i = 0; i < row_width; i++)
|
---|
| 510 | {
|
---|
| 511 | sp++;
|
---|
| 512 | *dp++ = *sp++;
|
---|
| 513 | }
|
---|
| 514 | }
|
---|
| 515 | row_info->pixel_depth = 8;
|
---|
| 516 | row_info->rowbytes = row_width;
|
---|
| 517 | }
|
---|
| 518 | else /* if (row_info->bit_depth == 16) */
|
---|
| 519 | {
|
---|
| 520 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
| 521 | {
|
---|
| 522 | /* This converts from GGXX or GGAA to GG */
|
---|
| 523 | sp += 4; dp += 2;
|
---|
| 524 | for (i = 1; i < row_width; i++)
|
---|
| 525 | {
|
---|
| 526 | *dp++ = *sp++;
|
---|
| 527 | *dp++ = *sp++;
|
---|
| 528 | sp += 2;
|
---|
| 529 | }
|
---|
| 530 | }
|
---|
| 531 | else
|
---|
| 532 | {
|
---|
| 533 | /* This converts from XXGG or AAGG to GG */
|
---|
| 534 | for (i = 0; i < row_width; i++)
|
---|
| 535 | {
|
---|
| 536 | sp += 2;
|
---|
| 537 | *dp++ = *sp++;
|
---|
| 538 | *dp++ = *sp++;
|
---|
| 539 | }
|
---|
| 540 | }
|
---|
| 541 | row_info->pixel_depth = 16;
|
---|
| 542 | row_info->rowbytes = row_width * 2;
|
---|
| 543 | }
|
---|
| 544 | row_info->channels = 1;
|
---|
| 545 | }
|
---|
| 546 | if (flags & PNG_FLAG_STRIP_ALPHA)
|
---|
| 547 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
|
---|
| 548 | }
|
---|
| 549 | }
|
---|
| 550 | #endif
|
---|
| 551 |
|
---|
| 552 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
---|
| 553 | /* swaps red and blue bytes within a pixel */
|
---|
| 554 | void /* PRIVATE */
|
---|
| 555 | png_do_bgr(png_row_infop row_info, png_bytep row)
|
---|
| 556 | {
|
---|
| 557 | png_debug(1, "in png_do_bgr\n");
|
---|
| 558 | if (
|
---|
| 559 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
|
---|
| 560 | row != NULL && row_info != NULL &&
|
---|
| 561 | #endif
|
---|
| 562 | (row_info->color_type & PNG_COLOR_MASK_COLOR))
|
---|
| 563 | {
|
---|
| 564 | png_uint_32 row_width = row_info->width;
|
---|
| 565 | if (row_info->bit_depth == 8)
|
---|
| 566 | {
|
---|
| 567 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
---|
| 568 | {
|
---|
| 569 | png_bytep rp;
|
---|
| 570 | png_uint_32 i;
|
---|
| 571 |
|
---|
| 572 | for (i = 0, rp = row; i < row_width; i++, rp += 3)
|
---|
| 573 | {
|
---|
| 574 | png_byte save = *rp;
|
---|
| 575 | *rp = *(rp + 2);
|
---|
| 576 | *(rp + 2) = save;
|
---|
| 577 | }
|
---|
| 578 | }
|
---|
| 579 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
---|
| 580 | {
|
---|
| 581 | png_bytep rp;
|
---|
| 582 | png_uint_32 i;
|
---|
| 583 |
|
---|
| 584 | for (i = 0, rp = row; i < row_width; i++, rp += 4)
|
---|
| 585 | {
|
---|
| 586 | png_byte save = *rp;
|
---|
| 587 | *rp = *(rp + 2);
|
---|
| 588 | *(rp + 2) = save;
|
---|
| 589 | }
|
---|
| 590 | }
|
---|
| 591 | }
|
---|
| 592 | else if (row_info->bit_depth == 16)
|
---|
| 593 | {
|
---|
| 594 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
---|
| 595 | {
|
---|
| 596 | png_bytep rp;
|
---|
| 597 | png_uint_32 i;
|
---|
| 598 |
|
---|
| 599 | for (i = 0, rp = row; i < row_width; i++, rp += 6)
|
---|
| 600 | {
|
---|
| 601 | png_byte save = *rp;
|
---|
| 602 | *rp = *(rp + 4);
|
---|
| 603 | *(rp + 4) = save;
|
---|
| 604 | save = *(rp + 1);
|
---|
| 605 | *(rp + 1) = *(rp + 5);
|
---|
| 606 | *(rp + 5) = save;
|
---|
| 607 | }
|
---|
| 608 | }
|
---|
| 609 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
---|
| 610 | {
|
---|
| 611 | png_bytep rp;
|
---|
| 612 | png_uint_32 i;
|
---|
| 613 |
|
---|
| 614 | for (i = 0, rp = row; i < row_width; i++, rp += 8)
|
---|
| 615 | {
|
---|
| 616 | png_byte save = *rp;
|
---|
| 617 | *rp = *(rp + 4);
|
---|
| 618 | *(rp + 4) = save;
|
---|
| 619 | save = *(rp + 1);
|
---|
| 620 | *(rp + 1) = *(rp + 5);
|
---|
| 621 | *(rp + 5) = save;
|
---|
| 622 | }
|
---|
| 623 | }
|
---|
| 624 | }
|
---|
| 625 | }
|
---|
| 626 | }
|
---|
| 627 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
|
---|
| 628 |
|
---|
| 629 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
---|
| 630 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
---|
| 631 | defined(PNG_LEGACY_SUPPORTED)
|
---|
| 632 | void PNGAPI
|
---|
| 633 | png_set_user_transform_info(png_structp png_ptr, png_voidp
|
---|
| 634 | user_transform_ptr, int user_transform_depth, int user_transform_channels)
|
---|
| 635 | {
|
---|
| 636 | png_debug(1, "in png_set_user_transform_info\n");
|
---|
| 637 | if(png_ptr == NULL) return;
|
---|
| 638 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
---|
| 639 | png_ptr->user_transform_ptr = user_transform_ptr;
|
---|
| 640 | png_ptr->user_transform_depth = (png_byte)user_transform_depth;
|
---|
| 641 | png_ptr->user_transform_channels = (png_byte)user_transform_channels;
|
---|
| 642 | #else
|
---|
| 643 | if(user_transform_ptr || user_transform_depth || user_transform_channels)
|
---|
| 644 | png_warning(png_ptr,
|
---|
| 645 | "This version of libpng does not support user transform info");
|
---|
| 646 | #endif
|
---|
| 647 | }
|
---|
| 648 | #endif
|
---|
| 649 |
|
---|
| 650 | /* This function returns a pointer to the user_transform_ptr associated with
|
---|
| 651 | * the user transform functions. The application should free any memory
|
---|
| 652 | * associated with this pointer before png_write_destroy and png_read_destroy
|
---|
| 653 | * are called.
|
---|
| 654 | */
|
---|
| 655 | png_voidp PNGAPI
|
---|
| 656 | png_get_user_transform_ptr(png_structp png_ptr)
|
---|
| 657 | {
|
---|
| 658 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
---|
| 659 | if (png_ptr == NULL) return (NULL);
|
---|
| 660 | return ((png_voidp)png_ptr->user_transform_ptr);
|
---|
| 661 | #else
|
---|
| 662 | return (NULL);
|
---|
| 663 | #endif
|
---|
| 664 | }
|
---|
| 665 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
|
---|