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william |
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/* pngtrans.c - transforms the data in a row (used by both readers and writers) |
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* |
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* Last changed in libpng 1.2.36 [May 14, 2009] |
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson |
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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* |
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* This code is released under the libpng license. |
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* For conditions of distribution and use, see the disclaimer |
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* and license in png.h |
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*/ |
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#define PNG_INTERNAL |
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#include "png.h" |
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
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#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
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/* Turn on BGR-to-RGB mapping */ |
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void PNGAPI |
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png_set_bgr(png_structp png_ptr) |
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{ |
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png_debug(1, "in png_set_bgr"); |
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if (png_ptr == NULL) |
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return; |
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png_ptr->transformations |= PNG_BGR; |
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} |
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#endif |
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#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
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/* Turn on 16 bit byte swapping */ |
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void PNGAPI |
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png_set_swap(png_structp png_ptr) |
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{ |
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png_debug(1, "in png_set_swap"); |
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if (png_ptr == NULL) |
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return; |
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if (png_ptr->bit_depth == 16) |
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png_ptr->transformations |= PNG_SWAP_BYTES; |
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} |
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#endif |
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#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
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/* Turn on pixel packing */ |
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void PNGAPI |
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png_set_packing(png_structp png_ptr) |
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{ |
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png_debug(1, "in png_set_packing"); |
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if (png_ptr == NULL) |
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return; |
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if (png_ptr->bit_depth < 8) |
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{ |
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png_ptr->transformations |= PNG_PACK; |
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png_ptr->usr_bit_depth = 8; |
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} |
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} |
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#endif |
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#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
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/* Turn on packed pixel swapping */ |
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void PNGAPI |
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png_set_packswap(png_structp png_ptr) |
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{ |
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png_debug(1, "in png_set_packswap"); |
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if (png_ptr == NULL) |
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return; |
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if (png_ptr->bit_depth < 8) |
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png_ptr->transformations |= PNG_PACKSWAP; |
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} |
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#endif |
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#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
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void PNGAPI |
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png_set_shift(png_structp png_ptr, png_color_8p true_bits) |
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{ |
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png_debug(1, "in png_set_shift"); |
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if (png_ptr == NULL) |
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return; |
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png_ptr->transformations |= PNG_SHIFT; |
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png_ptr->shift = *true_bits; |
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} |
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#endif |
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#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
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defined(PNG_WRITE_INTERLACING_SUPPORTED) |
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int PNGAPI |
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png_set_interlace_handling(png_structp png_ptr) |
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{ |
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png_debug(1, "in png_set_interlace handling"); |
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if (png_ptr && png_ptr->interlaced) |
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{ |
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png_ptr->transformations |= PNG_INTERLACE; |
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return (7); |
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} |
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return (1); |
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} |
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#endif |
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#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
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/* Add a filler byte on read, or remove a filler or alpha byte on write. |
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* The filler type has changed in v0.95 to allow future 2-byte fillers |
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* for 48-bit input data, as well as to avoid problems with some compilers |
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* that don't like bytes as parameters. |
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*/ |
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void PNGAPI |
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png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) |
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{ |
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png_debug(1, "in png_set_filler"); |
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if (png_ptr == NULL) |
| 111 |
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return; |
| 112 |
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png_ptr->transformations |= PNG_FILLER; |
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png_ptr->filler = (png_byte)filler; |
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if (filler_loc == PNG_FILLER_AFTER) |
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png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
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else |
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png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
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| 119 |
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/* This should probably go in the "do_read_filler" routine. |
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* I attempted to do that in libpng-1.0.1a but that caused problems |
| 121 |
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* so I restored it in libpng-1.0.2a |
| 122 |
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*/ |
| 123 |
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| 124 |
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if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
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{ |
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png_ptr->usr_channels = 4; |
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} |
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/* Also I added this in libpng-1.0.2a (what happens when we expand |
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* a less-than-8-bit grayscale to GA? */ |
| 131 |
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if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8) |
| 133 |
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{ |
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png_ptr->usr_channels = 2; |
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} |
| 136 |
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} |
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#if !defined(PNG_1_0_X) |
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/* Added to libpng-1.2.7 */ |
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void PNGAPI |
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png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc) |
| 142 |
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{ |
| 143 |
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png_debug(1, "in png_set_add_alpha"); |
| 144 |
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if (png_ptr == NULL) |
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return; |
| 146 |
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png_set_filler(png_ptr, filler, filler_loc); |
| 147 |
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png_ptr->transformations |= PNG_ADD_ALPHA; |
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} |
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#endif |
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#endif |
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#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
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defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 155 |
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void PNGAPI |
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png_set_swap_alpha(png_structp png_ptr) |
| 157 |
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{ |
| 158 |
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png_debug(1, "in png_set_swap_alpha"); |
| 159 |
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if (png_ptr == NULL) |
| 160 |
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return; |
| 161 |
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png_ptr->transformations |= PNG_SWAP_ALPHA; |
| 162 |
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} |
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#endif |
| 164 |
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| 165 |
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#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 166 |
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defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 167 |
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void PNGAPI |
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png_set_invert_alpha(png_structp png_ptr) |
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{ |
| 170 |
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png_debug(1, "in png_set_invert_alpha"); |
| 171 |
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if (png_ptr == NULL) |
| 172 |
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return; |
| 173 |
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png_ptr->transformations |= PNG_INVERT_ALPHA; |
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} |
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#endif |
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#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
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void PNGAPI |
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png_set_invert_mono(png_structp png_ptr) |
| 180 |
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{ |
| 181 |
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png_debug(1, "in png_set_invert_mono"); |
| 182 |
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if (png_ptr == NULL) |
| 183 |
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return; |
| 184 |
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png_ptr->transformations |= PNG_INVERT_MONO; |
| 185 |
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} |
| 186 |
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/* Invert monochrome grayscale data */ |
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void /* PRIVATE */ |
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png_do_invert(png_row_infop row_info, png_bytep row) |
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{ |
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png_debug(1, "in png_do_invert"); |
| 192 |
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/* This test removed from libpng version 1.0.13 and 1.2.0: |
| 193 |
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* if (row_info->bit_depth == 1 && |
| 194 |
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*/ |
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#if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 196 |
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if (row == NULL || row_info == NULL) |
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return; |
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#endif |
| 199 |
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if (row_info->color_type == PNG_COLOR_TYPE_GRAY) |
| 200 |
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{ |
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png_bytep rp = row; |
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png_uint_32 i; |
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png_uint_32 istop = row_info->rowbytes; |
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for (i = 0; i < istop; i++) |
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{ |
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*rp = (png_byte)(~(*rp)); |
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rp++; |
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} |
| 210 |
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} |
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else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 212 |
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row_info->bit_depth == 8) |
| 213 |
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{ |
| 214 |
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png_bytep rp = row; |
| 215 |
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png_uint_32 i; |
| 216 |
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png_uint_32 istop = row_info->rowbytes; |
| 217 |
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| 218 |
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for (i = 0; i < istop; i+=2) |
| 219 |
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{ |
| 220 |
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*rp = (png_byte)(~(*rp)); |
| 221 |
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rp+=2; |
| 222 |
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} |
| 223 |
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} |
| 224 |
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else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 225 |
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row_info->bit_depth == 16) |
| 226 |
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{ |
| 227 |
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png_bytep rp = row; |
| 228 |
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png_uint_32 i; |
| 229 |
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png_uint_32 istop = row_info->rowbytes; |
| 230 |
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| 231 |
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for (i = 0; i < istop; i+=4) |
| 232 |
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{ |
| 233 |
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*rp = (png_byte)(~(*rp)); |
| 234 |
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*(rp+1) = (png_byte)(~(*(rp+1))); |
| 235 |
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rp+=4; |
| 236 |
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} |
| 237 |
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} |
| 238 |
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} |
| 239 |
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#endif |
| 240 |
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| 241 |
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#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| 242 |
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/* Swaps byte order on 16 bit depth images */ |
| 243 |
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void /* PRIVATE */ |
| 244 |
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png_do_swap(png_row_infop row_info, png_bytep row) |
| 245 |
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{ |
| 246 |
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png_debug(1, "in png_do_swap"); |
| 247 |
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if ( |
| 248 |
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#if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 249 |
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row != NULL && row_info != NULL && |
| 250 |
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#endif |
| 251 |
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row_info->bit_depth == 16) |
| 252 |
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{ |
| 253 |
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png_bytep rp = row; |
| 254 |
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png_uint_32 i; |
| 255 |
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png_uint_32 istop= row_info->width * row_info->channels; |
| 256 |
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| 257 |
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for (i = 0; i < istop; i++, rp += 2) |
| 258 |
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{ |
| 259 |
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png_byte t = *rp; |
| 260 |
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*rp = *(rp + 1); |
| 261 |
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*(rp + 1) = t; |
| 262 |
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} |
| 263 |
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} |
| 264 |
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} |
| 265 |
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#endif |
| 266 |
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| 267 |
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#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 268 |
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static PNG_CONST png_byte onebppswaptable[256] = { |
| 269 |
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0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
| 270 |
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0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
| 271 |
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0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
| 272 |
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0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
| 273 |
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0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
| 274 |
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0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
| 275 |
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0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
| 276 |
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0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
| 277 |
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0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
| 278 |
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0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
| 279 |
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0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
| 280 |
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0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
| 281 |
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0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
| 282 |
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0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
| 283 |
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0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
| 284 |
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0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
| 285 |
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0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
| 286 |
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0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
| 287 |
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0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
| 288 |
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0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
| 289 |
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0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
| 290 |
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0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
| 291 |
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0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
| 292 |
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0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
| 293 |
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0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
| 294 |
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0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
| 295 |
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0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
| 296 |
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0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
| 297 |
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0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
| 298 |
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0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
| 299 |
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0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
| 300 |
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0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
| 301 |
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}; |
| 302 |
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| 303 |
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static PNG_CONST png_byte twobppswaptable[256] = { |
| 304 |
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0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
| 305 |
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0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
| 306 |
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0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
| 307 |
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0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
| 308 |
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0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
| 309 |
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0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
| 310 |
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0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
| 311 |
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0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
| 312 |
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0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
| 313 |
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0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
| 314 |
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0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
| 315 |
|
|
0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
| 316 |
|
|
0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
| 317 |
|
|
0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
| 318 |
|
|
0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
| 319 |
|
|
0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
| 320 |
|
|
0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
| 321 |
|
|
0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
| 322 |
|
|
0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
| 323 |
|
|
0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
| 324 |
|
|
0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
| 325 |
|
|
0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
| 326 |
|
|
0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
| 327 |
|
|
0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
| 328 |
|
|
0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
| 329 |
|
|
0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
| 330 |
|
|
0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
| 331 |
|
|
0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
| 332 |
|
|
0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
| 333 |
|
|
0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
| 334 |
|
|
0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
| 335 |
|
|
0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
| 336 |
|
|
}; |
| 337 |
|
|
|
| 338 |
|
|
static PNG_CONST png_byte fourbppswaptable[256] = { |
| 339 |
|
|
0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
| 340 |
|
|
0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
| 341 |
|
|
0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
| 342 |
|
|
0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
| 343 |
|
|
0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
| 344 |
|
|
0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
| 345 |
|
|
0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
| 346 |
|
|
0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
| 347 |
|
|
0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
| 348 |
|
|
0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
| 349 |
|
|
0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
| 350 |
|
|
0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
| 351 |
|
|
0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
| 352 |
|
|
0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
| 353 |
|
|
0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
| 354 |
|
|
0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
| 355 |
|
|
0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
| 356 |
|
|
0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
| 357 |
|
|
0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
| 358 |
|
|
0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
| 359 |
|
|
0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
| 360 |
|
|
0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
| 361 |
|
|
0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
| 362 |
|
|
0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
| 363 |
|
|
0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
| 364 |
|
|
0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
| 365 |
|
|
0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
| 366 |
|
|
0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
| 367 |
|
|
0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
| 368 |
|
|
0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
| 369 |
|
|
0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
| 370 |
|
|
0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
| 371 |
|
|
}; |
| 372 |
|
|
|
| 373 |
|
|
/* Swaps pixel packing order within bytes */ |
| 374 |
|
|
void /* PRIVATE */ |
| 375 |
|
|
png_do_packswap(png_row_infop row_info, png_bytep row) |
| 376 |
|
|
{ |
| 377 |
|
|
png_debug(1, "in png_do_packswap"); |
| 378 |
|
|
if ( |
| 379 |
|
|
#if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 380 |
|
|
row != NULL && row_info != NULL && |
| 381 |
|
|
#endif |
| 382 |
|
|
row_info->bit_depth < 8) |
| 383 |
|
|
{ |
| 384 |
|
|
png_bytep rp, end, table; |
| 385 |
|
|
|
| 386 |
|
|
end = row + row_info->rowbytes; |
| 387 |
|
|
|
| 388 |
|
|
if (row_info->bit_depth == 1) |
| 389 |
|
|
table = (png_bytep)onebppswaptable; |
| 390 |
|
|
else if (row_info->bit_depth == 2) |
| 391 |
|
|
table = (png_bytep)twobppswaptable; |
| 392 |
|
|
else if (row_info->bit_depth == 4) |
| 393 |
|
|
table = (png_bytep)fourbppswaptable; |
| 394 |
|
|
else |
| 395 |
|
|
return; |
| 396 |
|
|
|
| 397 |
|
|
for (rp = row; rp < end; rp++) |
| 398 |
|
|
*rp = table[*rp]; |
| 399 |
|
|
} |
| 400 |
|
|
} |
| 401 |
|
|
#endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
| 402 |
|
|
|
| 403 |
|
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 404 |
|
|
defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 405 |
|
|
/* Remove filler or alpha byte(s) */ |
| 406 |
|
|
void /* PRIVATE */ |
| 407 |
|
|
png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) |
| 408 |
|
|
{ |
| 409 |
|
|
png_debug(1, "in png_do_strip_filler"); |
| 410 |
|
|
#if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 411 |
|
|
if (row != NULL && row_info != NULL) |
| 412 |
|
|
#endif |
| 413 |
|
|
{ |
| 414 |
|
|
png_bytep sp=row; |
| 415 |
|
|
png_bytep dp=row; |
| 416 |
|
|
png_uint_32 row_width=row_info->width; |
| 417 |
|
|
png_uint_32 i; |
| 418 |
|
|
|
| 419 |
|
|
if ((row_info->color_type == PNG_COLOR_TYPE_RGB || |
| 420 |
|
|
(row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && |
| 421 |
|
|
(flags & PNG_FLAG_STRIP_ALPHA))) && |
| 422 |
|
|
row_info->channels == 4) |
| 423 |
|
|
{ |
| 424 |
|
|
if (row_info->bit_depth == 8) |
| 425 |
|
|
{ |
| 426 |
|
|
/* This converts from RGBX or RGBA to RGB */ |
| 427 |
|
|
if (flags & PNG_FLAG_FILLER_AFTER) |
| 428 |
|
|
{ |
| 429 |
|
|
dp+=3; sp+=4; |
| 430 |
|
|
for (i = 1; i < row_width; i++) |
| 431 |
|
|
{ |
| 432 |
|
|
*dp++ = *sp++; |
| 433 |
|
|
*dp++ = *sp++; |
| 434 |
|
|
*dp++ = *sp++; |
| 435 |
|
|
sp++; |
| 436 |
|
|
} |
| 437 |
|
|
} |
| 438 |
|
|
/* This converts from XRGB or ARGB to RGB */ |
| 439 |
|
|
else |
| 440 |
|
|
{ |
| 441 |
|
|
for (i = 0; i < row_width; i++) |
| 442 |
|
|
{ |
| 443 |
|
|
sp++; |
| 444 |
|
|
*dp++ = *sp++; |
| 445 |
|
|
*dp++ = *sp++; |
| 446 |
|
|
*dp++ = *sp++; |
| 447 |
|
|
} |
| 448 |
|
|
} |
| 449 |
|
|
row_info->pixel_depth = 24; |
| 450 |
|
|
row_info->rowbytes = row_width * 3; |
| 451 |
|
|
} |
| 452 |
|
|
else /* if (row_info->bit_depth == 16) */ |
| 453 |
|
|
{ |
| 454 |
|
|
if (flags & PNG_FLAG_FILLER_AFTER) |
| 455 |
|
|
{ |
| 456 |
|
|
/* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ |
| 457 |
|
|
sp += 8; dp += 6; |
| 458 |
|
|
for (i = 1; i < row_width; i++) |
| 459 |
|
|
{ |
| 460 |
|
|
/* This could be (although png_memcpy is probably slower): |
| 461 |
|
|
png_memcpy(dp, sp, 6); |
| 462 |
|
|
sp += 8; |
| 463 |
|
|
dp += 6; |
| 464 |
|
|
*/ |
| 465 |
|
|
|
| 466 |
|
|
*dp++ = *sp++; |
| 467 |
|
|
*dp++ = *sp++; |
| 468 |
|
|
*dp++ = *sp++; |
| 469 |
|
|
*dp++ = *sp++; |
| 470 |
|
|
*dp++ = *sp++; |
| 471 |
|
|
*dp++ = *sp++; |
| 472 |
|
|
sp += 2; |
| 473 |
|
|
} |
| 474 |
|
|
} |
| 475 |
|
|
else |
| 476 |
|
|
{ |
| 477 |
|
|
/* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ |
| 478 |
|
|
for (i = 0; i < row_width; i++) |
| 479 |
|
|
{ |
| 480 |
|
|
/* This could be (although png_memcpy is probably slower): |
| 481 |
|
|
png_memcpy(dp, sp, 6); |
| 482 |
|
|
sp += 8; |
| 483 |
|
|
dp += 6; |
| 484 |
|
|
*/ |
| 485 |
|
|
|
| 486 |
|
|
sp+=2; |
| 487 |
|
|
*dp++ = *sp++; |
| 488 |
|
|
*dp++ = *sp++; |
| 489 |
|
|
*dp++ = *sp++; |
| 490 |
|
|
*dp++ = *sp++; |
| 491 |
|
|
*dp++ = *sp++; |
| 492 |
|
|
*dp++ = *sp++; |
| 493 |
|
|
} |
| 494 |
|
|
} |
| 495 |
|
|
row_info->pixel_depth = 48; |
| 496 |
|
|
row_info->rowbytes = row_width * 6; |
| 497 |
|
|
} |
| 498 |
|
|
row_info->channels = 3; |
| 499 |
|
|
} |
| 500 |
|
|
else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY || |
| 501 |
|
|
(row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 502 |
|
|
(flags & PNG_FLAG_STRIP_ALPHA))) && |
| 503 |
|
|
row_info->channels == 2) |
| 504 |
|
|
{ |
| 505 |
|
|
if (row_info->bit_depth == 8) |
| 506 |
|
|
{ |
| 507 |
|
|
/* This converts from GX or GA to G */ |
| 508 |
|
|
if (flags & PNG_FLAG_FILLER_AFTER) |
| 509 |
|
|
{ |
| 510 |
|
|
for (i = 0; i < row_width; i++) |
| 511 |
|
|
{ |
| 512 |
|
|
*dp++ = *sp++; |
| 513 |
|
|
sp++; |
| 514 |
|
|
} |
| 515 |
|
|
} |
| 516 |
|
|
/* This converts from XG or AG to G */ |
| 517 |
|
|
else |
| 518 |
|
|
{ |
| 519 |
|
|
for (i = 0; i < row_width; i++) |
| 520 |
|
|
{ |
| 521 |
|
|
sp++; |
| 522 |
|
|
*dp++ = *sp++; |
| 523 |
|
|
} |
| 524 |
|
|
} |
| 525 |
|
|
row_info->pixel_depth = 8; |
| 526 |
|
|
row_info->rowbytes = row_width; |
| 527 |
|
|
} |
| 528 |
|
|
else /* if (row_info->bit_depth == 16) */ |
| 529 |
|
|
{ |
| 530 |
|
|
if (flags & PNG_FLAG_FILLER_AFTER) |
| 531 |
|
|
{ |
| 532 |
|
|
/* This converts from GGXX or GGAA to GG */ |
| 533 |
|
|
sp += 4; dp += 2; |
| 534 |
|
|
for (i = 1; i < row_width; i++) |
| 535 |
|
|
{ |
| 536 |
|
|
*dp++ = *sp++; |
| 537 |
|
|
*dp++ = *sp++; |
| 538 |
|
|
sp += 2; |
| 539 |
|
|
} |
| 540 |
|
|
} |
| 541 |
|
|
else |
| 542 |
|
|
{ |
| 543 |
|
|
/* This converts from XXGG or AAGG to GG */ |
| 544 |
|
|
for (i = 0; i < row_width; i++) |
| 545 |
|
|
{ |
| 546 |
|
|
sp += 2; |
| 547 |
|
|
*dp++ = *sp++; |
| 548 |
|
|
*dp++ = *sp++; |
| 549 |
|
|
} |
| 550 |
|
|
} |
| 551 |
|
|
row_info->pixel_depth = 16; |
| 552 |
|
|
row_info->rowbytes = row_width * 2; |
| 553 |
|
|
} |
| 554 |
|
|
row_info->channels = 1; |
| 555 |
|
|
} |
| 556 |
|
|
if (flags & PNG_FLAG_STRIP_ALPHA) |
| 557 |
|
|
row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; |
| 558 |
|
|
} |
| 559 |
|
|
} |
| 560 |
|
|
#endif |
| 561 |
|
|
|
| 562 |
|
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 563 |
|
|
/* Swaps red and blue bytes within a pixel */ |
| 564 |
|
|
void /* PRIVATE */ |
| 565 |
|
|
png_do_bgr(png_row_infop row_info, png_bytep row) |
| 566 |
|
|
{ |
| 567 |
|
|
png_debug(1, "in png_do_bgr"); |
| 568 |
|
|
if ( |
| 569 |
|
|
#if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 570 |
|
|
row != NULL && row_info != NULL && |
| 571 |
|
|
#endif |
| 572 |
|
|
(row_info->color_type & PNG_COLOR_MASK_COLOR)) |
| 573 |
|
|
{ |
| 574 |
|
|
png_uint_32 row_width = row_info->width; |
| 575 |
|
|
if (row_info->bit_depth == 8) |
| 576 |
|
|
{ |
| 577 |
|
|
if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 578 |
|
|
{ |
| 579 |
|
|
png_bytep rp; |
| 580 |
|
|
png_uint_32 i; |
| 581 |
|
|
|
| 582 |
|
|
for (i = 0, rp = row; i < row_width; i++, rp += 3) |
| 583 |
|
|
{ |
| 584 |
|
|
png_byte save = *rp; |
| 585 |
|
|
*rp = *(rp + 2); |
| 586 |
|
|
*(rp + 2) = save; |
| 587 |
|
|
} |
| 588 |
|
|
} |
| 589 |
|
|
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 590 |
|
|
{ |
| 591 |
|
|
png_bytep rp; |
| 592 |
|
|
png_uint_32 i; |
| 593 |
|
|
|
| 594 |
|
|
for (i = 0, rp = row; i < row_width; i++, rp += 4) |
| 595 |
|
|
{ |
| 596 |
|
|
png_byte save = *rp; |
| 597 |
|
|
*rp = *(rp + 2); |
| 598 |
|
|
*(rp + 2) = save; |
| 599 |
|
|
} |
| 600 |
|
|
} |
| 601 |
|
|
} |
| 602 |
|
|
else if (row_info->bit_depth == 16) |
| 603 |
|
|
{ |
| 604 |
|
|
if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 605 |
|
|
{ |
| 606 |
|
|
png_bytep rp; |
| 607 |
|
|
png_uint_32 i; |
| 608 |
|
|
|
| 609 |
|
|
for (i = 0, rp = row; i < row_width; i++, rp += 6) |
| 610 |
|
|
{ |
| 611 |
|
|
png_byte save = *rp; |
| 612 |
|
|
*rp = *(rp + 4); |
| 613 |
|
|
*(rp + 4) = save; |
| 614 |
|
|
save = *(rp + 1); |
| 615 |
|
|
*(rp + 1) = *(rp + 5); |
| 616 |
|
|
*(rp + 5) = save; |
| 617 |
|
|
} |
| 618 |
|
|
} |
| 619 |
|
|
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 620 |
|
|
{ |
| 621 |
|
|
png_bytep rp; |
| 622 |
|
|
png_uint_32 i; |
| 623 |
|
|
|
| 624 |
|
|
for (i = 0, rp = row; i < row_width; i++, rp += 8) |
| 625 |
|
|
{ |
| 626 |
|
|
png_byte save = *rp; |
| 627 |
|
|
*rp = *(rp + 4); |
| 628 |
|
|
*(rp + 4) = save; |
| 629 |
|
|
save = *(rp + 1); |
| 630 |
|
|
*(rp + 1) = *(rp + 5); |
| 631 |
|
|
*(rp + 5) = save; |
| 632 |
|
|
} |
| 633 |
|
|
} |
| 634 |
|
|
} |
| 635 |
|
|
} |
| 636 |
|
|
} |
| 637 |
|
|
#endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
| 638 |
|
|
|
| 639 |
|
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 640 |
|
|
defined(PNG_LEGACY_SUPPORTED) || \ |
| 641 |
|
|
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 642 |
|
|
void PNGAPI |
| 643 |
|
|
png_set_user_transform_info(png_structp png_ptr, png_voidp |
| 644 |
|
|
user_transform_ptr, int user_transform_depth, int user_transform_channels) |
| 645 |
|
|
{ |
| 646 |
|
|
png_debug(1, "in png_set_user_transform_info"); |
| 647 |
|
|
if (png_ptr == NULL) |
| 648 |
|
|
return; |
| 649 |
|
|
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
| 650 |
|
|
png_ptr->user_transform_ptr = user_transform_ptr; |
| 651 |
|
|
png_ptr->user_transform_depth = (png_byte)user_transform_depth; |
| 652 |
|
|
png_ptr->user_transform_channels = (png_byte)user_transform_channels; |
| 653 |
|
|
#else |
| 654 |
|
|
if (user_transform_ptr || user_transform_depth || user_transform_channels) |
| 655 |
|
|
png_warning(png_ptr, |
| 656 |
|
|
"This version of libpng does not support user transform info"); |
| 657 |
|
|
#endif |
| 658 |
|
|
} |
| 659 |
|
|
#endif |
| 660 |
|
|
|
| 661 |
|
|
/* This function returns a pointer to the user_transform_ptr associated with |
| 662 |
|
|
* the user transform functions. The application should free any memory |
| 663 |
|
|
* associated with this pointer before png_write_destroy and png_read_destroy |
| 664 |
|
|
* are called. |
| 665 |
|
|
*/ |
| 666 |
|
|
png_voidp PNGAPI |
| 667 |
|
|
png_get_user_transform_ptr(png_structp png_ptr) |
| 668 |
|
|
{ |
| 669 |
|
|
if (png_ptr == NULL) |
| 670 |
|
|
return (NULL); |
| 671 |
|
|
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
| 672 |
|
|
return ((png_voidp)png_ptr->user_transform_ptr); |
| 673 |
|
|
#else |
| 674 |
|
|
return (NULL); |
| 675 |
|
|
#endif |
| 676 |
|
|
} |
| 677 |
|
|
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |
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