Wei Chang Shen / DMemWin

Dependencies:   emwin_lib

Fork of DMemWin by Embedded Artists

png/pngwtran.c@4:20387dbf7ecf, 2016-06-02 (annotated)

Committer:
destinyXfate
Date:
Thu Jun 02 04:55:08 2016 +0000
Revision:
4:20387dbf7ecf
Parent:
2:0e2ef1edf01b 
;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
destinyXfate 2:0e2ef1edf01b 1
destinyXfate 2:0e2ef1edf01b 2 /* pngwtran.c - transforms the data in a row for PNG writers
destinyXfate 2:0e2ef1edf01b 3 *
destinyXfate 2:0e2ef1edf01b 4 * Last changed in libpng 1.2.9 April 14, 2006
destinyXfate 2:0e2ef1edf01b 5 * For conditions of distribution and use, see copyright notice in png.h
destinyXfate 2:0e2ef1edf01b 6 * Copyright (c) 1998-2006 Glenn Randers-Pehrson
destinyXfate 2:0e2ef1edf01b 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
destinyXfate 2:0e2ef1edf01b 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
destinyXfate 2:0e2ef1edf01b 9 */
destinyXfate 2:0e2ef1edf01b 10
destinyXfate 2:0e2ef1edf01b 11 #define PNG_INTERNAL
destinyXfate 2:0e2ef1edf01b 12 #include "png.h"
destinyXfate 2:0e2ef1edf01b 13 #ifdef PNG_WRITE_SUPPORTED
destinyXfate 2:0e2ef1edf01b 14
destinyXfate 2:0e2ef1edf01b 15 /* Transform the data according to the user's wishes. The order of
destinyXfate 2:0e2ef1edf01b 16 * transformations is significant.
destinyXfate 2:0e2ef1edf01b 17 */
destinyXfate 2:0e2ef1edf01b 18 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 19 png_do_write_transformations(png_structp png_ptr)
destinyXfate 2:0e2ef1edf01b 20 {
destinyXfate 2:0e2ef1edf01b 21 png_debug(1, "in png_do_write_transformations\n");
destinyXfate 2:0e2ef1edf01b 22
destinyXfate 2:0e2ef1edf01b 23 if (png_ptr == NULL)
destinyXfate 2:0e2ef1edf01b 24 return;
destinyXfate 2:0e2ef1edf01b 25
destinyXfate 2:0e2ef1edf01b 26 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 27 if (png_ptr->transformations & PNG_USER_TRANSFORM)
destinyXfate 2:0e2ef1edf01b 28 if(png_ptr->write_user_transform_fn != NULL)
destinyXfate 2:0e2ef1edf01b 29 (*(png_ptr->write_user_transform_fn)) /* user write transform function */
destinyXfate 2:0e2ef1edf01b 30 (png_ptr, /* png_ptr */
destinyXfate 2:0e2ef1edf01b 31 &(png_ptr->row_info), /* row_info: */
destinyXfate 2:0e2ef1edf01b 32 /* png_uint_32 width; width of row */
destinyXfate 2:0e2ef1edf01b 33 /* png_uint_32 rowbytes; number of bytes in row */
destinyXfate 2:0e2ef1edf01b 34 /* png_byte color_type; color type of pixels */
destinyXfate 2:0e2ef1edf01b 35 /* png_byte bit_depth; bit depth of samples */
destinyXfate 2:0e2ef1edf01b 36 /* png_byte channels; number of channels (1-4) */
destinyXfate 2:0e2ef1edf01b 37 /* png_byte pixel_depth; bits per pixel (depth*channels) */
destinyXfate 2:0e2ef1edf01b 38 png_ptr->row_buf + 1); /* start of pixel data for row */
destinyXfate 2:0e2ef1edf01b 39 #endif
destinyXfate 2:0e2ef1edf01b 40 #if defined(PNG_WRITE_FILLER_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 41 if (png_ptr->transformations & PNG_FILLER)
destinyXfate 2:0e2ef1edf01b 42 png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
destinyXfate 2:0e2ef1edf01b 43 png_ptr->flags);
destinyXfate 2:0e2ef1edf01b 44 #endif
destinyXfate 2:0e2ef1edf01b 45 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 46 if (png_ptr->transformations & PNG_PACKSWAP)
destinyXfate 2:0e2ef1edf01b 47 png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
destinyXfate 2:0e2ef1edf01b 48 #endif
destinyXfate 2:0e2ef1edf01b 49 #if defined(PNG_WRITE_PACK_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 50 if (png_ptr->transformations & PNG_PACK)
destinyXfate 2:0e2ef1edf01b 51 png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
destinyXfate 2:0e2ef1edf01b 52 (png_uint_32)png_ptr->bit_depth);
destinyXfate 2:0e2ef1edf01b 53 #endif
destinyXfate 2:0e2ef1edf01b 54 #if defined(PNG_WRITE_SWAP_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 55 if (png_ptr->transformations & PNG_SWAP_BYTES)
destinyXfate 2:0e2ef1edf01b 56 png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
destinyXfate 2:0e2ef1edf01b 57 #endif
destinyXfate 2:0e2ef1edf01b 58 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 59 if (png_ptr->transformations & PNG_SHIFT)
destinyXfate 2:0e2ef1edf01b 60 png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
destinyXfate 2:0e2ef1edf01b 61 &(png_ptr->shift));
destinyXfate 2:0e2ef1edf01b 62 #endif
destinyXfate 2:0e2ef1edf01b 63 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 64 if (png_ptr->transformations & PNG_SWAP_ALPHA)
destinyXfate 2:0e2ef1edf01b 65 png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
destinyXfate 2:0e2ef1edf01b 66 #endif
destinyXfate 2:0e2ef1edf01b 67 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 68 if (png_ptr->transformations & PNG_INVERT_ALPHA)
destinyXfate 2:0e2ef1edf01b 69 png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
destinyXfate 2:0e2ef1edf01b 70 #endif
destinyXfate 2:0e2ef1edf01b 71 #if defined(PNG_WRITE_BGR_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 72 if (png_ptr->transformations & PNG_BGR)
destinyXfate 2:0e2ef1edf01b 73 png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
destinyXfate 2:0e2ef1edf01b 74 #endif
destinyXfate 2:0e2ef1edf01b 75 #if defined(PNG_WRITE_INVERT_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 76 if (png_ptr->transformations & PNG_INVERT_MONO)
destinyXfate 2:0e2ef1edf01b 77 png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
destinyXfate 2:0e2ef1edf01b 78 #endif
destinyXfate 2:0e2ef1edf01b 79 }
destinyXfate 2:0e2ef1edf01b 80
destinyXfate 2:0e2ef1edf01b 81 #if defined(PNG_WRITE_PACK_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 82 /* Pack pixels into bytes. Pass the true bit depth in bit_depth. The
destinyXfate 2:0e2ef1edf01b 83 * row_info bit depth should be 8 (one pixel per byte). The channels
destinyXfate 2:0e2ef1edf01b 84 * should be 1 (this only happens on grayscale and paletted images).
destinyXfate 2:0e2ef1edf01b 85 */
destinyXfate 2:0e2ef1edf01b 86 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 87 png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
destinyXfate 2:0e2ef1edf01b 88 {
destinyXfate 2:0e2ef1edf01b 89 png_debug(1, "in png_do_pack\n");
destinyXfate 2:0e2ef1edf01b 90 if (row_info->bit_depth == 8 &&
destinyXfate 2:0e2ef1edf01b 91 #if defined(PNG_USELESS_TESTS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 92 row != NULL && row_info != NULL &&
destinyXfate 2:0e2ef1edf01b 93 #endif
destinyXfate 2:0e2ef1edf01b 94 row_info->channels == 1)
destinyXfate 2:0e2ef1edf01b 95 {
destinyXfate 2:0e2ef1edf01b 96 switch ((int)bit_depth)
destinyXfate 2:0e2ef1edf01b 97 {
destinyXfate 2:0e2ef1edf01b 98 case 1:
destinyXfate 2:0e2ef1edf01b 99 {
destinyXfate 2:0e2ef1edf01b 100 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 101 int mask, v;
destinyXfate 2:0e2ef1edf01b 102 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 103 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 104
destinyXfate 2:0e2ef1edf01b 105 sp = row;
destinyXfate 2:0e2ef1edf01b 106 dp = row;
destinyXfate 2:0e2ef1edf01b 107 mask = 0x80;
destinyXfate 2:0e2ef1edf01b 108 v = 0;
destinyXfate 2:0e2ef1edf01b 109
destinyXfate 2:0e2ef1edf01b 110 for (i = 0; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 111 {
destinyXfate 2:0e2ef1edf01b 112 if (*sp != 0)
destinyXfate 2:0e2ef1edf01b 113 v |= mask;
destinyXfate 2:0e2ef1edf01b 114 sp++;
destinyXfate 2:0e2ef1edf01b 115 if (mask > 1)
destinyXfate 2:0e2ef1edf01b 116 mask >>= 1;
destinyXfate 2:0e2ef1edf01b 117 else
destinyXfate 2:0e2ef1edf01b 118 {
destinyXfate 2:0e2ef1edf01b 119 mask = 0x80;
destinyXfate 2:0e2ef1edf01b 120 *dp = (png_byte)v;
destinyXfate 2:0e2ef1edf01b 121 dp++;
destinyXfate 2:0e2ef1edf01b 122 v = 0;
destinyXfate 2:0e2ef1edf01b 123 }
destinyXfate 2:0e2ef1edf01b 124 }
destinyXfate 2:0e2ef1edf01b 125 if (mask != 0x80)
destinyXfate 2:0e2ef1edf01b 126 *dp = (png_byte)v;
destinyXfate 2:0e2ef1edf01b 127 break;
destinyXfate 2:0e2ef1edf01b 128 }
destinyXfate 2:0e2ef1edf01b 129 case 2:
destinyXfate 2:0e2ef1edf01b 130 {
destinyXfate 2:0e2ef1edf01b 131 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 132 int shift, v;
destinyXfate 2:0e2ef1edf01b 133 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 134 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 135
destinyXfate 2:0e2ef1edf01b 136 sp = row;
destinyXfate 2:0e2ef1edf01b 137 dp = row;
destinyXfate 2:0e2ef1edf01b 138 shift = 6;
destinyXfate 2:0e2ef1edf01b 139 v = 0;
destinyXfate 2:0e2ef1edf01b 140 for (i = 0; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 141 {
destinyXfate 2:0e2ef1edf01b 142 png_byte value;
destinyXfate 2:0e2ef1edf01b 143
destinyXfate 2:0e2ef1edf01b 144 value = (png_byte)(*sp & 0x03);
destinyXfate 2:0e2ef1edf01b 145 v |= (value << shift);
destinyXfate 2:0e2ef1edf01b 146 if (shift == 0)
destinyXfate 2:0e2ef1edf01b 147 {
destinyXfate 2:0e2ef1edf01b 148 shift = 6;
destinyXfate 2:0e2ef1edf01b 149 *dp = (png_byte)v;
destinyXfate 2:0e2ef1edf01b 150 dp++;
destinyXfate 2:0e2ef1edf01b 151 v = 0;
destinyXfate 2:0e2ef1edf01b 152 }
destinyXfate 2:0e2ef1edf01b 153 else
destinyXfate 2:0e2ef1edf01b 154 shift -= 2;
destinyXfate 2:0e2ef1edf01b 155 sp++;
destinyXfate 2:0e2ef1edf01b 156 }
destinyXfate 2:0e2ef1edf01b 157 if (shift != 6)
destinyXfate 2:0e2ef1edf01b 158 *dp = (png_byte)v;
destinyXfate 2:0e2ef1edf01b 159 break;
destinyXfate 2:0e2ef1edf01b 160 }
destinyXfate 2:0e2ef1edf01b 161 case 4:
destinyXfate 2:0e2ef1edf01b 162 {
destinyXfate 2:0e2ef1edf01b 163 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 164 int shift, v;
destinyXfate 2:0e2ef1edf01b 165 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 166 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 167
destinyXfate 2:0e2ef1edf01b 168 sp = row;
destinyXfate 2:0e2ef1edf01b 169 dp = row;
destinyXfate 2:0e2ef1edf01b 170 shift = 4;
destinyXfate 2:0e2ef1edf01b 171 v = 0;
destinyXfate 2:0e2ef1edf01b 172 for (i = 0; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 173 {
destinyXfate 2:0e2ef1edf01b 174 png_byte value;
destinyXfate 2:0e2ef1edf01b 175
destinyXfate 2:0e2ef1edf01b 176 value = (png_byte)(*sp & 0x0f);
destinyXfate 2:0e2ef1edf01b 177 v |= (value << shift);
destinyXfate 2:0e2ef1edf01b 178
destinyXfate 2:0e2ef1edf01b 179 if (shift == 0)
destinyXfate 2:0e2ef1edf01b 180 {
destinyXfate 2:0e2ef1edf01b 181 shift = 4;
destinyXfate 2:0e2ef1edf01b 182 *dp = (png_byte)v;
destinyXfate 2:0e2ef1edf01b 183 dp++;
destinyXfate 2:0e2ef1edf01b 184 v = 0;
destinyXfate 2:0e2ef1edf01b 185 }
destinyXfate 2:0e2ef1edf01b 186 else
destinyXfate 2:0e2ef1edf01b 187 shift -= 4;
destinyXfate 2:0e2ef1edf01b 188
destinyXfate 2:0e2ef1edf01b 189 sp++;
destinyXfate 2:0e2ef1edf01b 190 }
destinyXfate 2:0e2ef1edf01b 191 if (shift != 4)
destinyXfate 2:0e2ef1edf01b 192 *dp = (png_byte)v;
destinyXfate 2:0e2ef1edf01b 193 break;
destinyXfate 2:0e2ef1edf01b 194 }
destinyXfate 2:0e2ef1edf01b 195 }
destinyXfate 2:0e2ef1edf01b 196 row_info->bit_depth = (png_byte)bit_depth;
destinyXfate 2:0e2ef1edf01b 197 row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
destinyXfate 2:0e2ef1edf01b 198 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
destinyXfate 2:0e2ef1edf01b 199 row_info->width);
destinyXfate 2:0e2ef1edf01b 200 }
destinyXfate 2:0e2ef1edf01b 201 }
destinyXfate 2:0e2ef1edf01b 202 #endif
destinyXfate 2:0e2ef1edf01b 203
destinyXfate 2:0e2ef1edf01b 204 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 205 /* Shift pixel values to take advantage of whole range. Pass the
destinyXfate 2:0e2ef1edf01b 206 * true number of bits in bit_depth. The row should be packed
destinyXfate 2:0e2ef1edf01b 207 * according to row_info->bit_depth. Thus, if you had a row of
destinyXfate 2:0e2ef1edf01b 208 * bit depth 4, but the pixels only had values from 0 to 7, you
destinyXfate 2:0e2ef1edf01b 209 * would pass 3 as bit_depth, and this routine would translate the
destinyXfate 2:0e2ef1edf01b 210 * data to 0 to 15.
destinyXfate 2:0e2ef1edf01b 211 */
destinyXfate 2:0e2ef1edf01b 212 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 213 png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
destinyXfate 2:0e2ef1edf01b 214 {
destinyXfate 2:0e2ef1edf01b 215 png_debug(1, "in png_do_shift\n");
destinyXfate 2:0e2ef1edf01b 216 #if defined(PNG_USELESS_TESTS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 217 if (row != NULL && row_info != NULL &&
destinyXfate 2:0e2ef1edf01b 218 #else
destinyXfate 2:0e2ef1edf01b 219 if (
destinyXfate 2:0e2ef1edf01b 220 #endif
destinyXfate 2:0e2ef1edf01b 221 row_info->color_type != PNG_COLOR_TYPE_PALETTE)
destinyXfate 2:0e2ef1edf01b 222 {
destinyXfate 2:0e2ef1edf01b 223 int shift_start[4], shift_dec[4];
destinyXfate 2:0e2ef1edf01b 224 int channels = 0;
destinyXfate 2:0e2ef1edf01b 225
destinyXfate 2:0e2ef1edf01b 226 if (row_info->color_type & PNG_COLOR_MASK_COLOR)
destinyXfate 2:0e2ef1edf01b 227 {
destinyXfate 2:0e2ef1edf01b 228 shift_start[channels] = row_info->bit_depth - bit_depth->red;
destinyXfate 2:0e2ef1edf01b 229 shift_dec[channels] = bit_depth->red;
destinyXfate 2:0e2ef1edf01b 230 channels++;
destinyXfate 2:0e2ef1edf01b 231 shift_start[channels] = row_info->bit_depth - bit_depth->green;
destinyXfate 2:0e2ef1edf01b 232 shift_dec[channels] = bit_depth->green;
destinyXfate 2:0e2ef1edf01b 233 channels++;
destinyXfate 2:0e2ef1edf01b 234 shift_start[channels] = row_info->bit_depth - bit_depth->blue;
destinyXfate 2:0e2ef1edf01b 235 shift_dec[channels] = bit_depth->blue;
destinyXfate 2:0e2ef1edf01b 236 channels++;
destinyXfate 2:0e2ef1edf01b 237 }
destinyXfate 2:0e2ef1edf01b 238 else
destinyXfate 2:0e2ef1edf01b 239 {
destinyXfate 2:0e2ef1edf01b 240 shift_start[channels] = row_info->bit_depth - bit_depth->gray;
destinyXfate 2:0e2ef1edf01b 241 shift_dec[channels] = bit_depth->gray;
destinyXfate 2:0e2ef1edf01b 242 channels++;
destinyXfate 2:0e2ef1edf01b 243 }
destinyXfate 2:0e2ef1edf01b 244 if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
destinyXfate 2:0e2ef1edf01b 245 {
destinyXfate 2:0e2ef1edf01b 246 shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
destinyXfate 2:0e2ef1edf01b 247 shift_dec[channels] = bit_depth->alpha;
destinyXfate 2:0e2ef1edf01b 248 channels++;
destinyXfate 2:0e2ef1edf01b 249 }
destinyXfate 2:0e2ef1edf01b 250
destinyXfate 2:0e2ef1edf01b 251 /* with low row depths, could only be grayscale, so one channel */
destinyXfate 2:0e2ef1edf01b 252 if (row_info->bit_depth < 8)
destinyXfate 2:0e2ef1edf01b 253 {
destinyXfate 2:0e2ef1edf01b 254 png_bytep bp = row;
destinyXfate 2:0e2ef1edf01b 255 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 256 png_byte mask;
destinyXfate 2:0e2ef1edf01b 257 png_uint_32 row_bytes = row_info->rowbytes;
destinyXfate 2:0e2ef1edf01b 258
destinyXfate 2:0e2ef1edf01b 259 if (bit_depth->gray == 1 && row_info->bit_depth == 2)
destinyXfate 2:0e2ef1edf01b 260 mask = 0x55;
destinyXfate 2:0e2ef1edf01b 261 else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
destinyXfate 2:0e2ef1edf01b 262 mask = 0x11;
destinyXfate 2:0e2ef1edf01b 263 else
destinyXfate 2:0e2ef1edf01b 264 mask = 0xff;
destinyXfate 2:0e2ef1edf01b 265
destinyXfate 2:0e2ef1edf01b 266 for (i = 0; i < row_bytes; i++, bp++)
destinyXfate 2:0e2ef1edf01b 267 {
destinyXfate 2:0e2ef1edf01b 268 png_uint_16 v;
destinyXfate 2:0e2ef1edf01b 269 int j;
destinyXfate 2:0e2ef1edf01b 270
destinyXfate 2:0e2ef1edf01b 271 v = *bp;
destinyXfate 2:0e2ef1edf01b 272 *bp = 0;
destinyXfate 2:0e2ef1edf01b 273 for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
destinyXfate 2:0e2ef1edf01b 274 {
destinyXfate 2:0e2ef1edf01b 275 if (j > 0)
destinyXfate 2:0e2ef1edf01b 276 *bp |= (png_byte)((v << j) & 0xff);
destinyXfate 2:0e2ef1edf01b 277 else
destinyXfate 2:0e2ef1edf01b 278 *bp |= (png_byte)((v >> (-j)) & mask);
destinyXfate 2:0e2ef1edf01b 279 }
destinyXfate 2:0e2ef1edf01b 280 }
destinyXfate 2:0e2ef1edf01b 281 }
destinyXfate 2:0e2ef1edf01b 282 else if (row_info->bit_depth == 8)
destinyXfate 2:0e2ef1edf01b 283 {
destinyXfate 2:0e2ef1edf01b 284 png_bytep bp = row;
destinyXfate 2:0e2ef1edf01b 285 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 286 png_uint_32 istop = channels * row_info->width;
destinyXfate 2:0e2ef1edf01b 287
destinyXfate 2:0e2ef1edf01b 288 for (i = 0; i < istop; i++, bp++)
destinyXfate 2:0e2ef1edf01b 289 {
destinyXfate 2:0e2ef1edf01b 290
destinyXfate 2:0e2ef1edf01b 291 png_uint_16 v;
destinyXfate 2:0e2ef1edf01b 292 int j;
destinyXfate 2:0e2ef1edf01b 293 int c = (int)(i%channels);
destinyXfate 2:0e2ef1edf01b 294
destinyXfate 2:0e2ef1edf01b 295 v = *bp;
destinyXfate 2:0e2ef1edf01b 296 *bp = 0;
destinyXfate 2:0e2ef1edf01b 297 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
destinyXfate 2:0e2ef1edf01b 298 {
destinyXfate 2:0e2ef1edf01b 299 if (j > 0)
destinyXfate 2:0e2ef1edf01b 300 *bp |= (png_byte)((v << j) & 0xff);
destinyXfate 2:0e2ef1edf01b 301 else
destinyXfate 2:0e2ef1edf01b 302 *bp |= (png_byte)((v >> (-j)) & 0xff);
destinyXfate 2:0e2ef1edf01b 303 }
destinyXfate 2:0e2ef1edf01b 304 }
destinyXfate 2:0e2ef1edf01b 305 }
destinyXfate 2:0e2ef1edf01b 306 else
destinyXfate 2:0e2ef1edf01b 307 {
destinyXfate 2:0e2ef1edf01b 308 png_bytep bp;
destinyXfate 2:0e2ef1edf01b 309 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 310 png_uint_32 istop = channels * row_info->width;
destinyXfate 2:0e2ef1edf01b 311
destinyXfate 2:0e2ef1edf01b 312 for (bp = row, i = 0; i < istop; i++)
destinyXfate 2:0e2ef1edf01b 313 {
destinyXfate 2:0e2ef1edf01b 314 int c = (int)(i%channels);
destinyXfate 2:0e2ef1edf01b 315 png_uint_16 value, v;
destinyXfate 2:0e2ef1edf01b 316 int j;
destinyXfate 2:0e2ef1edf01b 317
destinyXfate 2:0e2ef1edf01b 318 v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
destinyXfate 2:0e2ef1edf01b 319 value = 0;
destinyXfate 2:0e2ef1edf01b 320 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
destinyXfate 2:0e2ef1edf01b 321 {
destinyXfate 2:0e2ef1edf01b 322 if (j > 0)
destinyXfate 2:0e2ef1edf01b 323 value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
destinyXfate 2:0e2ef1edf01b 324 else
destinyXfate 2:0e2ef1edf01b 325 value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
destinyXfate 2:0e2ef1edf01b 326 }
destinyXfate 2:0e2ef1edf01b 327 *bp++ = (png_byte)(value >> 8);
destinyXfate 2:0e2ef1edf01b 328 *bp++ = (png_byte)(value & 0xff);
destinyXfate 2:0e2ef1edf01b 329 }
destinyXfate 2:0e2ef1edf01b 330 }
destinyXfate 2:0e2ef1edf01b 331 }
destinyXfate 2:0e2ef1edf01b 332 }
destinyXfate 2:0e2ef1edf01b 333 #endif
destinyXfate 2:0e2ef1edf01b 334
destinyXfate 2:0e2ef1edf01b 335 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 336 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 337 png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
destinyXfate 2:0e2ef1edf01b 338 {
destinyXfate 2:0e2ef1edf01b 339 png_debug(1, "in png_do_write_swap_alpha\n");
destinyXfate 2:0e2ef1edf01b 340 #if defined(PNG_USELESS_TESTS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 341 if (row != NULL && row_info != NULL)
destinyXfate 2:0e2ef1edf01b 342 #endif
destinyXfate 2:0e2ef1edf01b 343 {
destinyXfate 2:0e2ef1edf01b 344 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
destinyXfate 2:0e2ef1edf01b 345 {
destinyXfate 2:0e2ef1edf01b 346 /* This converts from ARGB to RGBA */
destinyXfate 2:0e2ef1edf01b 347 if (row_info->bit_depth == 8)
destinyXfate 2:0e2ef1edf01b 348 {
destinyXfate 2:0e2ef1edf01b 349 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 350 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 351 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 352 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 353 {
destinyXfate 2:0e2ef1edf01b 354 png_byte save = *(sp++);
destinyXfate 2:0e2ef1edf01b 355 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 356 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 357 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 358 *(dp++) = save;
destinyXfate 2:0e2ef1edf01b 359 }
destinyXfate 2:0e2ef1edf01b 360 }
destinyXfate 2:0e2ef1edf01b 361 /* This converts from AARRGGBB to RRGGBBAA */
destinyXfate 2:0e2ef1edf01b 362 else
destinyXfate 2:0e2ef1edf01b 363 {
destinyXfate 2:0e2ef1edf01b 364 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 365 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 366 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 367
destinyXfate 2:0e2ef1edf01b 368 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 369 {
destinyXfate 2:0e2ef1edf01b 370 png_byte save[2];
destinyXfate 2:0e2ef1edf01b 371 save[0] = *(sp++);
destinyXfate 2:0e2ef1edf01b 372 save[1] = *(sp++);
destinyXfate 2:0e2ef1edf01b 373 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 374 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 375 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 376 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 377 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 378 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 379 *(dp++) = save[0];
destinyXfate 2:0e2ef1edf01b 380 *(dp++) = save[1];
destinyXfate 2:0e2ef1edf01b 381 }
destinyXfate 2:0e2ef1edf01b 382 }
destinyXfate 2:0e2ef1edf01b 383 }
destinyXfate 2:0e2ef1edf01b 384 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
destinyXfate 2:0e2ef1edf01b 385 {
destinyXfate 2:0e2ef1edf01b 386 /* This converts from AG to GA */
destinyXfate 2:0e2ef1edf01b 387 if (row_info->bit_depth == 8)
destinyXfate 2:0e2ef1edf01b 388 {
destinyXfate 2:0e2ef1edf01b 389 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 390 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 391 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 392
destinyXfate 2:0e2ef1edf01b 393 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 394 {
destinyXfate 2:0e2ef1edf01b 395 png_byte save = *(sp++);
destinyXfate 2:0e2ef1edf01b 396 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 397 *(dp++) = save;
destinyXfate 2:0e2ef1edf01b 398 }
destinyXfate 2:0e2ef1edf01b 399 }
destinyXfate 2:0e2ef1edf01b 400 /* This converts from AAGG to GGAA */
destinyXfate 2:0e2ef1edf01b 401 else
destinyXfate 2:0e2ef1edf01b 402 {
destinyXfate 2:0e2ef1edf01b 403 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 404 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 405 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 406
destinyXfate 2:0e2ef1edf01b 407 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 408 {
destinyXfate 2:0e2ef1edf01b 409 png_byte save[2];
destinyXfate 2:0e2ef1edf01b 410 save[0] = *(sp++);
destinyXfate 2:0e2ef1edf01b 411 save[1] = *(sp++);
destinyXfate 2:0e2ef1edf01b 412 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 413 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 414 *(dp++) = save[0];
destinyXfate 2:0e2ef1edf01b 415 *(dp++) = save[1];
destinyXfate 2:0e2ef1edf01b 416 }
destinyXfate 2:0e2ef1edf01b 417 }
destinyXfate 2:0e2ef1edf01b 418 }
destinyXfate 2:0e2ef1edf01b 419 }
destinyXfate 2:0e2ef1edf01b 420 }
destinyXfate 2:0e2ef1edf01b 421 #endif
destinyXfate 2:0e2ef1edf01b 422
destinyXfate 2:0e2ef1edf01b 423 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 424 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 425 png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
destinyXfate 2:0e2ef1edf01b 426 {
destinyXfate 2:0e2ef1edf01b 427 png_debug(1, "in png_do_write_invert_alpha\n");
destinyXfate 2:0e2ef1edf01b 428 #if defined(PNG_USELESS_TESTS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 429 if (row != NULL && row_info != NULL)
destinyXfate 2:0e2ef1edf01b 430 #endif
destinyXfate 2:0e2ef1edf01b 431 {
destinyXfate 2:0e2ef1edf01b 432 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
destinyXfate 2:0e2ef1edf01b 433 {
destinyXfate 2:0e2ef1edf01b 434 /* This inverts the alpha channel in RGBA */
destinyXfate 2:0e2ef1edf01b 435 if (row_info->bit_depth == 8)
destinyXfate 2:0e2ef1edf01b 436 {
destinyXfate 2:0e2ef1edf01b 437 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 438 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 439 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 440 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 441 {
destinyXfate 2:0e2ef1edf01b 442 /* does nothing
destinyXfate 2:0e2ef1edf01b 443 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 444 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 445 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 446 */
destinyXfate 2:0e2ef1edf01b 447 sp+=3; dp = sp;
destinyXfate 2:0e2ef1edf01b 448 *(dp++) = (png_byte)(255 - *(sp++));
destinyXfate 2:0e2ef1edf01b 449 }
destinyXfate 2:0e2ef1edf01b 450 }
destinyXfate 2:0e2ef1edf01b 451 /* This inverts the alpha channel in RRGGBBAA */
destinyXfate 2:0e2ef1edf01b 452 else
destinyXfate 2:0e2ef1edf01b 453 {
destinyXfate 2:0e2ef1edf01b 454 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 455 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 456 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 457
destinyXfate 2:0e2ef1edf01b 458 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 459 {
destinyXfate 2:0e2ef1edf01b 460 /* does nothing
destinyXfate 2:0e2ef1edf01b 461 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 462 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 463 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 464 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 465 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 466 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 467 */
destinyXfate 2:0e2ef1edf01b 468 sp+=6; dp = sp;
destinyXfate 2:0e2ef1edf01b 469 *(dp++) = (png_byte)(255 - *(sp++));
destinyXfate 2:0e2ef1edf01b 470 *(dp++) = (png_byte)(255 - *(sp++));
destinyXfate 2:0e2ef1edf01b 471 }
destinyXfate 2:0e2ef1edf01b 472 }
destinyXfate 2:0e2ef1edf01b 473 }
destinyXfate 2:0e2ef1edf01b 474 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
destinyXfate 2:0e2ef1edf01b 475 {
destinyXfate 2:0e2ef1edf01b 476 /* This inverts the alpha channel in GA */
destinyXfate 2:0e2ef1edf01b 477 if (row_info->bit_depth == 8)
destinyXfate 2:0e2ef1edf01b 478 {
destinyXfate 2:0e2ef1edf01b 479 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 480 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 481 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 482
destinyXfate 2:0e2ef1edf01b 483 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 484 {
destinyXfate 2:0e2ef1edf01b 485 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 486 *(dp++) = (png_byte)(255 - *(sp++));
destinyXfate 2:0e2ef1edf01b 487 }
destinyXfate 2:0e2ef1edf01b 488 }
destinyXfate 2:0e2ef1edf01b 489 /* This inverts the alpha channel in GGAA */
destinyXfate 2:0e2ef1edf01b 490 else
destinyXfate 2:0e2ef1edf01b 491 {
destinyXfate 2:0e2ef1edf01b 492 png_bytep sp, dp;
destinyXfate 2:0e2ef1edf01b 493 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 494 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 495
destinyXfate 2:0e2ef1edf01b 496 for (i = 0, sp = dp = row; i < row_width; i++)
destinyXfate 2:0e2ef1edf01b 497 {
destinyXfate 2:0e2ef1edf01b 498 /* does nothing
destinyXfate 2:0e2ef1edf01b 499 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 500 *(dp++) = *(sp++);
destinyXfate 2:0e2ef1edf01b 501 */
destinyXfate 2:0e2ef1edf01b 502 sp+=2; dp = sp;
destinyXfate 2:0e2ef1edf01b 503 *(dp++) = (png_byte)(255 - *(sp++));
destinyXfate 2:0e2ef1edf01b 504 *(dp++) = (png_byte)(255 - *(sp++));
destinyXfate 2:0e2ef1edf01b 505 }
destinyXfate 2:0e2ef1edf01b 506 }
destinyXfate 2:0e2ef1edf01b 507 }
destinyXfate 2:0e2ef1edf01b 508 }
destinyXfate 2:0e2ef1edf01b 509 }
destinyXfate 2:0e2ef1edf01b 510 #endif
destinyXfate 2:0e2ef1edf01b 511
destinyXfate 2:0e2ef1edf01b 512 #if defined(PNG_MNG_FEATURES_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 513 /* undoes intrapixel differencing */
destinyXfate 2:0e2ef1edf01b 514 void /* PRIVATE */
destinyXfate 2:0e2ef1edf01b 515 png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
destinyXfate 2:0e2ef1edf01b 516 {
destinyXfate 2:0e2ef1edf01b 517 png_debug(1, "in png_do_write_intrapixel\n");
destinyXfate 2:0e2ef1edf01b 518 if (
destinyXfate 2:0e2ef1edf01b 519 #if defined(PNG_USELESS_TESTS_SUPPORTED)
destinyXfate 2:0e2ef1edf01b 520 row != NULL && row_info != NULL &&
destinyXfate 2:0e2ef1edf01b 521 #endif
destinyXfate 2:0e2ef1edf01b 522 (row_info->color_type & PNG_COLOR_MASK_COLOR))
destinyXfate 2:0e2ef1edf01b 523 {
destinyXfate 2:0e2ef1edf01b 524 int bytes_per_pixel;
destinyXfate 2:0e2ef1edf01b 525 png_uint_32 row_width = row_info->width;
destinyXfate 2:0e2ef1edf01b 526 if (row_info->bit_depth == 8)
destinyXfate 2:0e2ef1edf01b 527 {
destinyXfate 2:0e2ef1edf01b 528 png_bytep rp;
destinyXfate 2:0e2ef1edf01b 529 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 530
destinyXfate 2:0e2ef1edf01b 531 if (row_info->color_type == PNG_COLOR_TYPE_RGB)
destinyXfate 2:0e2ef1edf01b 532 bytes_per_pixel = 3;
destinyXfate 2:0e2ef1edf01b 533 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
destinyXfate 2:0e2ef1edf01b 534 bytes_per_pixel = 4;
destinyXfate 2:0e2ef1edf01b 535 else
destinyXfate 2:0e2ef1edf01b 536 return;
destinyXfate 2:0e2ef1edf01b 537
destinyXfate 2:0e2ef1edf01b 538 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
destinyXfate 2:0e2ef1edf01b 539 {
destinyXfate 2:0e2ef1edf01b 540 *(rp) = (png_byte)((*rp - *(rp+1))&0xff);
destinyXfate 2:0e2ef1edf01b 541 *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
destinyXfate 2:0e2ef1edf01b 542 }
destinyXfate 2:0e2ef1edf01b 543 }
destinyXfate 2:0e2ef1edf01b 544 else if (row_info->bit_depth == 16)
destinyXfate 2:0e2ef1edf01b 545 {
destinyXfate 2:0e2ef1edf01b 546 png_bytep rp;
destinyXfate 2:0e2ef1edf01b 547 png_uint_32 i;
destinyXfate 2:0e2ef1edf01b 548
destinyXfate 2:0e2ef1edf01b 549 if (row_info->color_type == PNG_COLOR_TYPE_RGB)
destinyXfate 2:0e2ef1edf01b 550 bytes_per_pixel = 6;
destinyXfate 2:0e2ef1edf01b 551 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
destinyXfate 2:0e2ef1edf01b 552 bytes_per_pixel = 8;
destinyXfate 2:0e2ef1edf01b 553 else
destinyXfate 2:0e2ef1edf01b 554 return;
destinyXfate 2:0e2ef1edf01b 555
destinyXfate 2:0e2ef1edf01b 556 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
destinyXfate 2:0e2ef1edf01b 557 {
destinyXfate 2:0e2ef1edf01b 558 png_uint_32 s0 = (*(rp ) << 8) | *(rp+1);
destinyXfate 2:0e2ef1edf01b 559 png_uint_32 s1 = (*(rp+2) << 8) | *(rp+3);
destinyXfate 2:0e2ef1edf01b 560 png_uint_32 s2 = (*(rp+4) << 8) | *(rp+5);
destinyXfate 2:0e2ef1edf01b 561 png_uint_32 red = (png_uint_32)((s0-s1) & 0xffffL);
destinyXfate 2:0e2ef1edf01b 562 png_uint_32 blue = (png_uint_32)((s2-s1) & 0xffffL);
destinyXfate 2:0e2ef1edf01b 563 *(rp ) = (png_byte)((red >> 8) & 0xff);
destinyXfate 2:0e2ef1edf01b 564 *(rp+1) = (png_byte)(red & 0xff);
destinyXfate 2:0e2ef1edf01b 565 *(rp+4) = (png_byte)((blue >> 8) & 0xff);
destinyXfate 2:0e2ef1edf01b 566 *(rp+5) = (png_byte)(blue & 0xff);
destinyXfate 2:0e2ef1edf01b 567 }
destinyXfate 2:0e2ef1edf01b 568 }
destinyXfate 2:0e2ef1edf01b 569 }
destinyXfate 2:0e2ef1edf01b 570 }
destinyXfate 2:0e2ef1edf01b 571 #endif /* PNG_MNG_FEATURES_SUPPORTED */
destinyXfate 2:0e2ef1edf01b 572 #endif /* PNG_WRITE_SUPPORTED */
destinyXfate 2:0e2ef1edf01b 573