src/png/pngset.c

   1
   2 /* pngset.c - storage of image information into info struct
   3  *
   4  * libpng 1.0.1
   5  * For conditions of distribution and use, see copyright notice in png.h
   6  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
   7  * Copyright (c) 1996, 1997 Andreas Dilger
   8  * Copyright (c) 1998, Glenn Randers-Pehrson
   9  * March 15, 1998
  10  *
  11  * The functions here are used during reads to store data from the file
  12  * into the info struct, and during writes to store application data
  13  * into the info struct for writing into the file.  This abstracts the
  14  * info struct and allows us to change the structure in the future.
  15  */
  16
  17 #define PNG_INTERNAL
  18 #include "png.h"
  19
  20 #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
  21 void
  22 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
  23 {
  24    png_debug1(1, "in %s storage function\n", "bKGD");
  25    if (png_ptr == NULL || info_ptr == NULL)
  26       return;
  27
  28    png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
  29    info_ptr->valid |= PNG_INFO_bKGD;
  30 }
  31 #endif
  32
  33 #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
  34 void
  35 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
  36    double white_x, double white_y, double red_x, double red_y,
  37    double green_x, double green_y, double blue_x, double blue_y)
  38 {
  39    png_debug1(1, "in %s storage function\n", "cHRM");
  40    if (png_ptr == NULL || info_ptr == NULL)
  41       return;
  42
  43    info_ptr->x_white = (float)white_x;
  44    info_ptr->y_white = (float)white_y;
  45    info_ptr->x_red   = (float)red_x;
  46    info_ptr->y_red   = (float)red_y;
  47    info_ptr->x_green = (float)green_x;
  48    info_ptr->y_green = (float)green_y;
  49    info_ptr->x_blue  = (float)blue_x;
  50    info_ptr->y_blue  = (float)blue_y;
  51    info_ptr->valid |= PNG_INFO_cHRM;
  52 }
  53 #endif
  54
  55 #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
  56 void
  57 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
  58 {
  59    png_debug1(1, "in %s storage function\n", "gAMA");
  60    if (png_ptr == NULL || info_ptr == NULL)
  61       return;
  62
  63    info_ptr->gamma = (float)file_gamma;
  64    info_ptr->valid |= PNG_INFO_gAMA;
  65 }
  66 #endif
  67
  68 #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
  69 void
  70 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
  71 {
  72    png_debug1(1, "in %s storage function\n", "hIST");
  73    if (png_ptr == NULL || info_ptr == NULL)
  74       return;
  75
  76    info_ptr->hist = hist;
  77    info_ptr->valid |= PNG_INFO_hIST;
  78 }
  79 #endif
  80
  81 void
  82 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
  83    png_uint_32 width, png_uint_32 height, int bit_depth,
  84    int color_type, int interlace_type, int compression_type,
  85    int filter_type)
  86 {
  87    int rowbytes_per_pixel;
  88    png_debug1(1, "in %s storage function\n", "IHDR");
  89    if (png_ptr == NULL || info_ptr == NULL)
  90       return;
  91
  92    info_ptr->width = width;
  93    info_ptr->height = height;
  94    info_ptr->bit_depth = (png_byte)bit_depth;
  95    info_ptr->color_type =(png_byte) color_type;
  96    info_ptr->compression_type = (png_byte)compression_type;
  97    info_ptr->filter_type = (png_byte)filter_type;
  98    info_ptr->interlace_type = (png_byte)interlace_type;
  99    if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
 100       info_ptr->channels = 1;
 101    else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
 102       info_ptr->channels = 3;
 103    else
 104       info_ptr->channels = 1;
 105    if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
 106       info_ptr->channels++;
 107    info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
 108
 109    /* check for overflow */
 110    rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
 111    info_ptr->rowbytes = info_ptr->width * rowbytes_per_pixel;
 112    if (( width > (png_uint_32)2147483647L/rowbytes_per_pixel))
 113    {
 114       png_warning(png_ptr,
 115          "Width too large to process image data; rowbytes will overflow.");
 116       info_ptr->rowbytes = (png_size_t)0;
 117    }
 118 }
 119
 120 #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
 121 void
 122 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
 123    png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
 124 {
 125    png_debug1(1, "in %s storage function\n", "oFFs");
 126    if (png_ptr == NULL || info_ptr == NULL)
 127       return;
 128
 129    info_ptr->x_offset = offset_x;
 130    info_ptr->y_offset = offset_y;
 131    info_ptr->offset_unit_type = (png_byte)unit_type;
 132    info_ptr->valid |= PNG_INFO_oFFs;
 133 }
 134 #endif
 135
 136 #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
 137 void
 138 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
 139    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
 140    png_charp units, png_charpp params)
 141 {
 142    png_uint_32 length;
 143    int i;
 144
 145    png_debug1(1, "in %s storage function\n", "pCAL");
 146    if (png_ptr == NULL || info_ptr == NULL)
 147       return;
 148
 149    length = png_strlen(purpose) + 1;
 150    png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
 151    info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
 152    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
 153
 154    png_debug(3, "storing X0, X1, type, and nparams in info\n");
 155    info_ptr->pcal_X0 = X0;
 156    info_ptr->pcal_X1 = X1;
 157    info_ptr->pcal_type = (png_byte)type;
 158    info_ptr->pcal_nparams = (png_byte)nparams;
 159
 160    length = png_strlen(units) + 1;
 161    png_debug1(3, "allocating units for info (%d bytes)\n", length);
 162    info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
 163    png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 164
 165    info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
 166       (png_uint_32)((nparams + 1) * sizeof(png_charp)));
 167    info_ptr->pcal_params[nparams] = NULL;
 168
 169    for (i = 0; i < nparams; i++)
 170    {
 171       length = png_strlen(params[i]) + 1;
 172       png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
 173       info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
 174       png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
 175    }
 176
 177    info_ptr->valid |= PNG_INFO_pCAL;
 178 }
 179 #endif
 180
 181 #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
 182 void
 183 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
 184    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
 185 {
 186    png_debug1(1, "in %s storage function\n", "pHYs");
 187    if (png_ptr == NULL || info_ptr == NULL)
 188       return;
 189
 190    info_ptr->x_pixels_per_unit = res_x;
 191    info_ptr->y_pixels_per_unit = res_y;
 192    info_ptr->phys_unit_type = (png_byte)unit_type;
 193    info_ptr->valid |= PNG_INFO_pHYs;
 194 }
 195 #endif
 196
 197 void
 198 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
 199    png_colorp palette, int num_palette)
 200 {
 201    png_debug1(1, "in %s storage function\n", "PLTE");
 202    if (png_ptr == NULL || info_ptr == NULL)
 203       return;
 204
 205    info_ptr->palette = palette;
 206    info_ptr->num_palette = (png_uint_16)num_palette;
 207    info_ptr->valid |= PNG_INFO_PLTE;
 208 }
 209
 210 #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
 211 void
 212 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
 213    png_color_8p sig_bit)
 214 {
 215    png_debug1(1, "in %s storage function\n", "sBIT");
 216    if (png_ptr == NULL || info_ptr == NULL)
 217       return;
 218
 219    png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
 220    info_ptr->valid |= PNG_INFO_sBIT;
 221 }
 222 #endif
 223
 224 #if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
 225 void
 226 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
 227 {
 228    png_debug1(1, "in %s storage function\n", "sRGB");
 229    if (png_ptr == NULL || info_ptr == NULL)
 230       return;
 231
 232    info_ptr->srgb_intent = (png_byte)intent;
 233    info_ptr->valid |= PNG_INFO_sRGB;
 234 }
 235 void
 236 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
 237    int intent)
 238 {
 239 #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
 240    float file_gamma;
 241 #endif
 242 #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
 243    float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
 244 #endif
 245    png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
 246    if (png_ptr == NULL || info_ptr == NULL)
 247       return;
 248
 249    png_set_sRGB(png_ptr, info_ptr, intent);
 250
 251 #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
 252    file_gamma = (float).45;
 253    png_set_gAMA(png_ptr, info_ptr, file_gamma);
 254 #endif
 255
 256 #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
 257    white_x = (float).3127;
 258    white_y = (float).3290;
 259    red_x   = (float).64;
 260    red_y   = (float).33;
 261    green_x = (float).30;
 262    green_y = (float).60;
 263    blue_x  = (float).15;
 264    blue_y  = (float).06;
 265
 266    png_set_cHRM(png_ptr, info_ptr,
 267       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
 268
 269 #endif
 270 }
 271 #endif
 272
 273 #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
 274     defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
 275 void
 276 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 277    int num_text)
 278 {
 279    int i;
 280
 281    png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
 282       "text" : (png_const_charp)png_ptr->chunk_name));
 283
 284    if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
 285       return;
 286
 287    /* Make sure we have enough space in the "text" array in info_struct
 288     * to hold all of the incoming text_ptr objects.
 289     */
 290    if (info_ptr->num_text + num_text > info_ptr->max_text)
 291    {
 292       if (info_ptr->text != NULL)
 293       {
 294          png_textp old_text;
 295          int old_max;
 296
 297          old_max = info_ptr->max_text;
 298          info_ptr->max_text = info_ptr->num_text + num_text + 8;
 299          old_text = info_ptr->text;
 300          info_ptr->text = (png_textp)png_malloc(png_ptr,
 301             (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
 302          png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
 303             sizeof(png_text)));
 304          png_free(png_ptr, old_text);
 305       }
 306       else
 307       {
 308          info_ptr->max_text = num_text + 8;
 309          info_ptr->num_text = 0;
 310          info_ptr->text = (png_textp)png_malloc(png_ptr,
 311             (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
 312       }
 313       png_debug1(3, "allocated %d entries for info_ptr->text\n",
 314          info_ptr->max_text);
 315    }
 316
 317    for (i = 0; i < num_text; i++)
 318    {
 319       png_textp textp = &(info_ptr->text[info_ptr->num_text]);
 320
 321       if (text_ptr[i].text == NULL)
 322          text_ptr[i].text = (png_charp)"";
 323
 324       if (text_ptr[i].text[0] == '\0')
 325       {
 326          textp->text_length = 0;
 327          textp->compression = PNG_TEXT_COMPRESSION_NONE;
 328       }
 329       else
 330       {
 331          textp->text_length = png_strlen(text_ptr[i].text);
 332          textp->compression = text_ptr[i].compression;
 333       }
 334       textp->text = text_ptr[i].text;
 335       textp->key = text_ptr[i].key;
 336       info_ptr->num_text++;
 337       png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
 338    }
 339 }
 340 #endif
 341
 342 #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
 343 void
 344 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 345 {
 346    png_debug1(1, "in %s storage function\n", "tIME");
 347    if (png_ptr == NULL || info_ptr == NULL)
 348       return;
 349
 350    png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
 351    info_ptr->valid |= PNG_INFO_tIME;
 352 }
 353 #endif
 354
 355 #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
 356 void
 357 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
 358    png_bytep trans, int num_trans, png_color_16p trans_values)
 359 {
 360    png_debug1(1, "in %s storage function\n", "tRNS");
 361    if (png_ptr == NULL || info_ptr == NULL)
 362       return;
 363
 364    if (trans != NULL)
 365    {
 366       info_ptr->trans = trans;
 367    }
 368
 369    if (trans_values != NULL)
 370    {
 371       png_memcpy(&(info_ptr->trans_values), trans_values,
 372          sizeof(png_color_16));
 373       if (num_trans == 0)
 374         num_trans = 1;
 375    }
 376    info_ptr->num_trans = (png_uint_16)num_trans;
 377    info_ptr->valid |= PNG_INFO_tRNS;
 378 }
 379 #endif
 380