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lightning-sunbird  0.9+nobinonly
pngset.c
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00001 
00002 /* pngset.c - storage of image information into info struct
00003  *
00004  * libpng 1.2.7 - September 12, 2004
00005  * For conditions of distribution and use, see copyright notice in png.h
00006  * Copyright (c) 1998-2004 Glenn Randers-Pehrson
00007  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
00008  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
00009  *
00010  * The functions here are used during reads to store data from the file
00011  * into the info struct, and during writes to store application data
00012  * into the info struct for writing into the file.  This abstracts the
00013  * info struct and allows us to change the structure in the future.
00014  */
00015 
00016 #define PNG_INTERNAL
00017 #include "png.h"
00018 
00019 #if defined(PNG_bKGD_SUPPORTED)
00020 void PNGAPI
00021 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
00022 {
00023    png_debug1(1, "in %s storage function\n", "bKGD");
00024    if (png_ptr == NULL || info_ptr == NULL)
00025       return;
00026 
00027    png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16));
00028    info_ptr->valid |= PNG_INFO_bKGD;
00029 }
00030 #endif
00031 
00032 #if defined(PNG_cHRM_SUPPORTED)
00033 #ifdef PNG_FLOATING_POINT_SUPPORTED
00034 void PNGAPI
00035 png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
00036    double white_x, double white_y, double red_x, double red_y,
00037    double green_x, double green_y, double blue_x, double blue_y)
00038 {
00039    png_debug1(1, "in %s storage function\n", "cHRM");
00040    if (png_ptr == NULL || info_ptr == NULL)
00041       return;
00042 
00043    if (white_x < 0.0 || white_y < 0.0 ||
00044          red_x < 0.0 ||   red_y < 0.0 ||
00045        green_x < 0.0 || green_y < 0.0 ||
00046         blue_x < 0.0 ||  blue_y < 0.0)
00047    {
00048       png_warning(png_ptr,
00049         "Ignoring attempt to set negative chromaticity value");
00050       return;
00051    }
00052    if (white_x > 21474.83 || white_y > 21474.83 ||
00053          red_x > 21474.83 ||   red_y > 21474.83 ||
00054        green_x > 21474.83 || green_y > 21474.83 ||
00055         blue_x > 21474.83 ||  blue_y > 21474.83)
00056    {
00057       png_warning(png_ptr,
00058         "Ignoring attempt to set chromaticity value exceeding 21474.83");
00059       return;
00060    }
00061 
00062    info_ptr->x_white = (float)white_x;
00063    info_ptr->y_white = (float)white_y;
00064    info_ptr->x_red   = (float)red_x;
00065    info_ptr->y_red   = (float)red_y;
00066    info_ptr->x_green = (float)green_x;
00067    info_ptr->y_green = (float)green_y;
00068    info_ptr->x_blue  = (float)blue_x;
00069    info_ptr->y_blue  = (float)blue_y;
00070 #ifdef PNG_FIXED_POINT_SUPPORTED
00071    info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
00072    info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
00073    info_ptr->int_x_red   = (png_fixed_point)(  red_x*100000.+0.5);
00074    info_ptr->int_y_red   = (png_fixed_point)(  red_y*100000.+0.5);
00075    info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
00076    info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
00077    info_ptr->int_x_blue  = (png_fixed_point)( blue_x*100000.+0.5);
00078    info_ptr->int_y_blue  = (png_fixed_point)( blue_y*100000.+0.5);
00079 #endif
00080    info_ptr->valid |= PNG_INFO_cHRM;
00081 }
00082 #endif
00083 #ifdef PNG_FIXED_POINT_SUPPORTED
00084 void PNGAPI
00085 png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
00086    png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
00087    png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
00088    png_fixed_point blue_x, png_fixed_point blue_y)
00089 {
00090    png_debug1(1, "in %s storage function\n", "cHRM");
00091    if (png_ptr == NULL || info_ptr == NULL)
00092       return;
00093 
00094    if (white_x < 0 || white_y < 0 ||
00095          red_x < 0 ||   red_y < 0 ||
00096        green_x < 0 || green_y < 0 ||
00097         blue_x < 0 ||  blue_y < 0)
00098    {
00099       png_warning(png_ptr,
00100         "Ignoring attempt to set negative chromaticity value");
00101       return;
00102    }
00103    if (white_x > (double) PNG_UINT_31_MAX ||
00104        white_y > (double) PNG_UINT_31_MAX ||
00105          red_x > (double) PNG_UINT_31_MAX ||
00106          red_y > (double) PNG_UINT_31_MAX ||
00107        green_x > (double) PNG_UINT_31_MAX ||
00108        green_y > (double) PNG_UINT_31_MAX ||
00109         blue_x > (double) PNG_UINT_31_MAX ||
00110         blue_y > (double) PNG_UINT_31_MAX)
00111    {
00112       png_warning(png_ptr,
00113         "Ignoring attempt to set chromaticity value exceeding 21474.83");
00114       return;
00115    }
00116    info_ptr->int_x_white = white_x;
00117    info_ptr->int_y_white = white_y;
00118    info_ptr->int_x_red   = red_x;
00119    info_ptr->int_y_red   = red_y;
00120    info_ptr->int_x_green = green_x;
00121    info_ptr->int_y_green = green_y;
00122    info_ptr->int_x_blue  = blue_x;
00123    info_ptr->int_y_blue  = blue_y;
00124 #ifdef PNG_FLOATING_POINT_SUPPORTED
00125    info_ptr->x_white = (float)(white_x/100000.);
00126    info_ptr->y_white = (float)(white_y/100000.);
00127    info_ptr->x_red   = (float)(  red_x/100000.);
00128    info_ptr->y_red   = (float)(  red_y/100000.);
00129    info_ptr->x_green = (float)(green_x/100000.);
00130    info_ptr->y_green = (float)(green_y/100000.);
00131    info_ptr->x_blue  = (float)( blue_x/100000.);
00132    info_ptr->y_blue  = (float)( blue_y/100000.);
00133 #endif
00134    info_ptr->valid |= PNG_INFO_cHRM;
00135 }
00136 #endif
00137 #endif
00138 
00139 #if defined(PNG_gAMA_SUPPORTED)
00140 #ifdef PNG_FLOATING_POINT_SUPPORTED
00141 void PNGAPI
00142 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
00143 {
00144    double gamma;
00145    png_debug1(1, "in %s storage function\n", "gAMA");
00146    if (png_ptr == NULL || info_ptr == NULL)
00147       return;
00148 
00149    /* Check for overflow */
00150    if (file_gamma > 21474.83)
00151    {
00152       png_warning(png_ptr, "Limiting gamma to 21474.83");
00153       gamma=21474.83;
00154    }
00155    else
00156       gamma=file_gamma;
00157    info_ptr->gamma = (float)gamma;
00158 #ifdef PNG_FIXED_POINT_SUPPORTED
00159    info_ptr->int_gamma = (int)(gamma*100000.+.5);
00160 #endif
00161    info_ptr->valid |= PNG_INFO_gAMA;
00162    if(gamma == 0.0)
00163       png_warning(png_ptr, "Setting gamma=0");
00164 }
00165 #endif
00166 void PNGAPI
00167 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
00168    int_gamma)
00169 {
00170    png_fixed_point gamma;
00171 
00172    png_debug1(1, "in %s storage function\n", "gAMA");
00173    if (png_ptr == NULL || info_ptr == NULL)
00174       return;
00175 
00176    if (int_gamma > (png_fixed_point) PNG_UINT_31_MAX)
00177    {
00178      png_warning(png_ptr, "Limiting gamma to 21474.83");
00179      gamma=PNG_UINT_31_MAX;
00180    }
00181    else
00182    {
00183      if (int_gamma < 0)
00184      {
00185        png_warning(png_ptr, "Setting negative gamma to zero");
00186        gamma=0;
00187      }
00188      else
00189        gamma=int_gamma;
00190    }
00191 #ifdef PNG_FLOATING_POINT_SUPPORTED
00192    info_ptr->gamma = (float)(gamma/100000.);
00193 #endif
00194 #ifdef PNG_FIXED_POINT_SUPPORTED
00195    info_ptr->int_gamma = gamma;
00196 #endif
00197    info_ptr->valid |= PNG_INFO_gAMA;
00198    if(gamma == 0)
00199       png_warning(png_ptr, "Setting gamma=0");
00200 }
00201 #endif
00202 
00203 #if defined(PNG_hIST_SUPPORTED)
00204 void PNGAPI
00205 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
00206 {
00207    int i;
00208 
00209    png_debug1(1, "in %s storage function\n", "hIST");
00210    if (png_ptr == NULL || info_ptr == NULL)
00211       return;
00212    if (info_ptr->num_palette == 0)
00213    {
00214        png_warning(png_ptr,
00215           "Palette size 0, hIST allocation skipped.");
00216        return;
00217    }
00218 
00219 #ifdef PNG_FREE_ME_SUPPORTED
00220    png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
00221 #endif
00222    /* Changed from info->num_palette to 256 in version 1.2.1 */
00223    png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
00224       (png_uint_32)(256 * png_sizeof (png_uint_16)));
00225    if (png_ptr->hist == NULL)
00226      {
00227        png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
00228        return;
00229      }
00230 
00231    for (i = 0; i < info_ptr->num_palette; i++)
00232        png_ptr->hist[i] = hist[i];
00233    info_ptr->hist = png_ptr->hist;
00234    info_ptr->valid |= PNG_INFO_hIST;
00235 
00236 #ifdef PNG_FREE_ME_SUPPORTED
00237    info_ptr->free_me |= PNG_FREE_HIST;
00238 #else
00239    png_ptr->flags |= PNG_FLAG_FREE_HIST;
00240 #endif
00241 }
00242 #endif
00243 
00244 void PNGAPI
00245 png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
00246    png_uint_32 width, png_uint_32 height, int bit_depth,
00247    int color_type, int interlace_type, int compression_type,
00248    int filter_type)
00249 {
00250    png_debug1(1, "in %s storage function\n", "IHDR");
00251    if (png_ptr == NULL || info_ptr == NULL)
00252       return;
00253 
00254    /* check for width and height valid values */
00255    if (width == 0 || height == 0)
00256       png_error(png_ptr, "Image width or height is zero in IHDR");
00257 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
00258    if (width > png_ptr->user_width_max || height > png_ptr->user_height_max)
00259       png_error(png_ptr, "image size exceeds user limits in IHDR");
00260 #else
00261    if (width > PNG_USER_WIDTH_MAX || height > PNG_USER_HEIGHT_MAX)
00262       png_error(png_ptr, "image size exceeds user limits in IHDR");
00263 #endif
00264    if (width > PNG_UINT_31_MAX || height > PNG_UINT_31_MAX)
00265       png_error(png_ptr, "Invalid image size in IHDR");
00266    if ( width > (PNG_UINT_32_MAX
00267                  >> 3)      /* 8-byte RGBA pixels */
00268                  - 64       /* bigrowbuf hack */
00269                  - 1        /* filter byte */
00270                  - 7*8      /* rounding of width to multiple of 8 pixels */
00271                  - 8)       /* extra max_pixel_depth pad */
00272       png_warning(png_ptr, "Width is too large for libpng to process pixels");
00273 
00274    /* check other values */
00275    if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
00276       bit_depth != 8 && bit_depth != 16)
00277       png_error(png_ptr, "Invalid bit depth in IHDR");
00278 
00279    if (color_type < 0 || color_type == 1 ||
00280       color_type == 5 || color_type > 6)
00281       png_error(png_ptr, "Invalid color type in IHDR");
00282 
00283    if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
00284        ((color_type == PNG_COLOR_TYPE_RGB ||
00285          color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
00286          color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
00287       png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
00288 
00289    if (interlace_type >= PNG_INTERLACE_LAST)
00290       png_error(png_ptr, "Unknown interlace method in IHDR");
00291 
00292    if (compression_type != PNG_COMPRESSION_TYPE_BASE)
00293       png_error(png_ptr, "Unknown compression method in IHDR");
00294 
00295 #if defined(PNG_MNG_FEATURES_SUPPORTED)
00296    /* Accept filter_method 64 (intrapixel differencing) only if
00297     * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
00298     * 2. Libpng did not read a PNG signature (this filter_method is only
00299     *    used in PNG datastreams that are embedded in MNG datastreams) and
00300     * 3. The application called png_permit_mng_features with a mask that
00301     *    included PNG_FLAG_MNG_FILTER_64 and
00302     * 4. The filter_method is 64 and
00303     * 5. The color_type is RGB or RGBA
00304     */
00305    if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
00306       png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
00307    if(filter_type != PNG_FILTER_TYPE_BASE)
00308    {
00309      if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
00310         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
00311         ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
00312         (color_type == PNG_COLOR_TYPE_RGB || 
00313          color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
00314         png_error(png_ptr, "Unknown filter method in IHDR");
00315      if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
00316         png_warning(png_ptr, "Invalid filter method in IHDR");
00317    }
00318 #else
00319    if(filter_type != PNG_FILTER_TYPE_BASE)
00320       png_error(png_ptr, "Unknown filter method in IHDR");
00321 #endif
00322 
00323    info_ptr->width = width;
00324    info_ptr->height = height;
00325    info_ptr->bit_depth = (png_byte)bit_depth;
00326    info_ptr->color_type =(png_byte) color_type;
00327    info_ptr->compression_type = (png_byte)compression_type;
00328    info_ptr->filter_type = (png_byte)filter_type;
00329    info_ptr->interlace_type = (png_byte)interlace_type;
00330    if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
00331       info_ptr->channels = 1;
00332    else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
00333       info_ptr->channels = 3;
00334    else
00335       info_ptr->channels = 1;
00336    if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
00337       info_ptr->channels++;
00338    info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
00339 
00340    /* check for potential overflow */
00341    if ( width > (PNG_UINT_32_MAX
00342                  >> 3)      /* 8-byte RGBA pixels */
00343                  - 64       /* bigrowbuf hack */
00344                  - 1        /* filter byte */
00345                  - 7*8      /* rounding of width to multiple of 8 pixels */
00346                  - 8)       /* extra max_pixel_depth pad */
00347       info_ptr->rowbytes = (png_size_t)0;
00348    else
00349       info_ptr->rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth,width);
00350 }
00351 
00352 #if defined(PNG_oFFs_SUPPORTED)
00353 void PNGAPI
00354 png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
00355    png_int_32 offset_x, png_int_32 offset_y, int unit_type)
00356 {
00357    png_debug1(1, "in %s storage function\n", "oFFs");
00358    if (png_ptr == NULL || info_ptr == NULL)
00359       return;
00360 
00361    info_ptr->x_offset = offset_x;
00362    info_ptr->y_offset = offset_y;
00363    info_ptr->offset_unit_type = (png_byte)unit_type;
00364    info_ptr->valid |= PNG_INFO_oFFs;
00365 }
00366 #endif
00367 
00368 #if defined(PNG_pCAL_SUPPORTED)
00369 void PNGAPI
00370 png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
00371    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
00372    png_charp units, png_charpp params)
00373 {
00374    png_uint_32 length;
00375    int i;
00376 
00377    png_debug1(1, "in %s storage function\n", "pCAL");
00378    if (png_ptr == NULL || info_ptr == NULL)
00379       return;
00380 
00381    length = png_strlen(purpose) + 1;
00382    png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
00383    info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
00384    if (info_ptr->pcal_purpose == NULL)
00385      {
00386        png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
00387        return;
00388      }
00389    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
00390 
00391    png_debug(3, "storing X0, X1, type, and nparams in info\n");
00392    info_ptr->pcal_X0 = X0;
00393    info_ptr->pcal_X1 = X1;
00394    info_ptr->pcal_type = (png_byte)type;
00395    info_ptr->pcal_nparams = (png_byte)nparams;
00396 
00397    length = png_strlen(units) + 1;
00398    png_debug1(3, "allocating units for info (%lu bytes)\n", length);
00399    info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
00400    if (info_ptr->pcal_units == NULL)
00401      {
00402        png_warning(png_ptr, "Insufficient memory for pCAL units.");
00403        return;
00404      }
00405    png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
00406 
00407    info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
00408       (png_uint_32)((nparams + 1) * png_sizeof(png_charp)));
00409    if (info_ptr->pcal_params == NULL)
00410      {
00411        png_warning(png_ptr, "Insufficient memory for pCAL params.");
00412        return;
00413      }
00414 
00415    info_ptr->pcal_params[nparams] = NULL;
00416 
00417    for (i = 0; i < nparams; i++)
00418    {
00419       length = png_strlen(params[i]) + 1;
00420       png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
00421       info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
00422       if (info_ptr->pcal_params[i] == NULL)
00423         {
00424           png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
00425           return;
00426         }
00427       png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
00428    }
00429 
00430    info_ptr->valid |= PNG_INFO_pCAL;
00431 #ifdef PNG_FREE_ME_SUPPORTED
00432    info_ptr->free_me |= PNG_FREE_PCAL;
00433 #endif
00434 }
00435 #endif
00436 
00437 #if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
00438 #ifdef PNG_FLOATING_POINT_SUPPORTED
00439 void PNGAPI
00440 png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
00441              int unit, double width, double height)
00442 {
00443    png_debug1(1, "in %s storage function\n", "sCAL");
00444    if (png_ptr == NULL || info_ptr == NULL)
00445       return;
00446 
00447    info_ptr->scal_unit = (png_byte)unit;
00448    info_ptr->scal_pixel_width = width;
00449    info_ptr->scal_pixel_height = height;
00450 
00451    info_ptr->valid |= PNG_INFO_sCAL;
00452 }
00453 #else
00454 #ifdef PNG_FIXED_POINT_SUPPORTED
00455 void PNGAPI
00456 png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
00457              int unit, png_charp swidth, png_charp sheight)
00458 {
00459    png_uint_32 length;
00460 
00461    png_debug1(1, "in %s storage function\n", "sCAL");
00462    if (png_ptr == NULL || info_ptr == NULL)
00463       return;
00464 
00465    info_ptr->scal_unit = (png_byte)unit;
00466 
00467    length = png_strlen(swidth) + 1;
00468    png_debug1(3, "allocating unit for info (%d bytes)\n", length);
00469    info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
00470    if (info_ptr->scal_s_width == NULL)
00471    {
00472       png_warning(png_ptr, "Memory allocation failed while processing sCAL.");
00473    }
00474    png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
00475 
00476    length = png_strlen(sheight) + 1;
00477    png_debug1(3, "allocating unit for info (%d bytes)\n", length);
00478    info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, length);
00479    if (info_ptr->scal_s_height == NULL)
00480    {
00481       png_free (png_ptr, info_ptr->scal_s_width);
00482       png_warning(png_ptr, "Memory allocation failed while processing sCAL.");
00483    }
00484    png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
00485 
00486    info_ptr->valid |= PNG_INFO_sCAL;
00487 #ifdef PNG_FREE_ME_SUPPORTED
00488    info_ptr->free_me |= PNG_FREE_SCAL;
00489 #endif
00490 }
00491 #endif
00492 #endif
00493 #endif
00494 
00495 #if defined(PNG_pHYs_SUPPORTED)
00496 void PNGAPI
00497 png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
00498    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
00499 {
00500    png_debug1(1, "in %s storage function\n", "pHYs");
00501    if (png_ptr == NULL || info_ptr == NULL)
00502       return;
00503 
00504    info_ptr->x_pixels_per_unit = res_x;
00505    info_ptr->y_pixels_per_unit = res_y;
00506    info_ptr->phys_unit_type = (png_byte)unit_type;
00507    info_ptr->valid |= PNG_INFO_pHYs;
00508 }
00509 #endif
00510 
00511 void PNGAPI
00512 png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
00513    png_colorp palette, int num_palette)
00514 {
00515 
00516    png_debug1(1, "in %s storage function\n", "PLTE");
00517    if (png_ptr == NULL || info_ptr == NULL)
00518       return;
00519 
00520    /*
00521     * It may not actually be necessary to set png_ptr->palette here;
00522     * we do it for backward compatibility with the way the png_handle_tRNS
00523     * function used to do the allocation.
00524     */
00525 #ifdef PNG_FREE_ME_SUPPORTED
00526    png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
00527 #endif
00528 
00529    /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
00530       in case of an invalid PNG file that has too-large sample values. */
00531    png_ptr->palette = (png_colorp)png_malloc(png_ptr,
00532       256 * png_sizeof(png_color));
00533    png_memset(png_ptr->palette, 0, 256 * png_sizeof(png_color));
00534    png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color));
00535    info_ptr->palette = png_ptr->palette;
00536    info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
00537 
00538 #ifdef PNG_FREE_ME_SUPPORTED
00539    info_ptr->free_me |= PNG_FREE_PLTE;
00540 #else
00541    png_ptr->flags |= PNG_FLAG_FREE_PLTE;
00542 #endif
00543 
00544    info_ptr->valid |= PNG_INFO_PLTE;
00545 }
00546 
00547 #if defined(PNG_sBIT_SUPPORTED)
00548 void PNGAPI
00549 png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
00550    png_color_8p sig_bit)
00551 {
00552    png_debug1(1, "in %s storage function\n", "sBIT");
00553    if (png_ptr == NULL || info_ptr == NULL)
00554       return;
00555 
00556    png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof (png_color_8));
00557    info_ptr->valid |= PNG_INFO_sBIT;
00558 }
00559 #endif
00560 
00561 #if defined(PNG_sRGB_SUPPORTED)
00562 void PNGAPI
00563 png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
00564 {
00565    png_debug1(1, "in %s storage function\n", "sRGB");
00566    if (png_ptr == NULL || info_ptr == NULL)
00567       return;
00568 
00569    info_ptr->srgb_intent = (png_byte)intent;
00570    info_ptr->valid |= PNG_INFO_sRGB;
00571 }
00572 
00573 void PNGAPI
00574 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
00575    int intent)
00576 {
00577 #if defined(PNG_gAMA_SUPPORTED)
00578 #ifdef PNG_FLOATING_POINT_SUPPORTED
00579    float file_gamma;
00580 #endif
00581 #ifdef PNG_FIXED_POINT_SUPPORTED
00582    png_fixed_point int_file_gamma;
00583 #endif
00584 #endif
00585 #if defined(PNG_cHRM_SUPPORTED)
00586 #ifdef PNG_FLOATING_POINT_SUPPORTED
00587    float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
00588 #endif
00589 #ifdef PNG_FIXED_POINT_SUPPORTED
00590    png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
00591       int_green_y, int_blue_x, int_blue_y;
00592 #endif
00593 #endif
00594    png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
00595    if (png_ptr == NULL || info_ptr == NULL)
00596       return;
00597 
00598    png_set_sRGB(png_ptr, info_ptr, intent);
00599 
00600 #if defined(PNG_gAMA_SUPPORTED)
00601 #ifdef PNG_FLOATING_POINT_SUPPORTED
00602    file_gamma = (float).45455;
00603    png_set_gAMA(png_ptr, info_ptr, file_gamma);
00604 #endif
00605 #ifdef PNG_FIXED_POINT_SUPPORTED
00606    int_file_gamma = 45455L;
00607    png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
00608 #endif
00609 #endif
00610 
00611 #if defined(PNG_cHRM_SUPPORTED)
00612 #ifdef PNG_FIXED_POINT_SUPPORTED
00613    int_white_x = 31270L;
00614    int_white_y = 32900L;
00615    int_red_x   = 64000L;
00616    int_red_y   = 33000L;
00617    int_green_x = 30000L;
00618    int_green_y = 60000L;
00619    int_blue_x  = 15000L;
00620    int_blue_y  =  6000L;
00621 
00622    png_set_cHRM_fixed(png_ptr, info_ptr,
00623       int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
00624       int_blue_x, int_blue_y);
00625 #endif
00626 #ifdef PNG_FLOATING_POINT_SUPPORTED
00627    white_x = (float).3127;
00628    white_y = (float).3290;
00629    red_x   = (float).64;
00630    red_y   = (float).33;
00631    green_x = (float).30;
00632    green_y = (float).60;
00633    blue_x  = (float).15;
00634    blue_y  = (float).06;
00635 
00636    png_set_cHRM(png_ptr, info_ptr,
00637       white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
00638 #endif
00639 #endif
00640 }
00641 #endif
00642 
00643 
00644 #if defined(PNG_iCCP_SUPPORTED)
00645 void PNGAPI
00646 png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
00647              png_charp name, int compression_type,
00648              png_charp profile, png_uint_32 proflen)
00649 {
00650    png_charp new_iccp_name;
00651    png_charp new_iccp_profile;
00652 
00653    png_debug1(1, "in %s storage function\n", "iCCP");
00654    if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
00655       return;
00656 
00657    new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1);
00658    if (new_iccp_name == NULL)
00659    {
00660       png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
00661       return;
00662    }
00663    png_strcpy(new_iccp_name, name);
00664    new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
00665    if (new_iccp_profile == NULL)
00666    {
00667       png_free (png_ptr, new_iccp_name);
00668       png_warning(png_ptr, "Insufficient memory to process iCCP profile.");
00669       return;
00670    }
00671    png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
00672 
00673    png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
00674 
00675    info_ptr->iccp_proflen = proflen;
00676    info_ptr->iccp_name = new_iccp_name;
00677    info_ptr->iccp_profile = new_iccp_profile;
00678    /* Compression is always zero but is here so the API and info structure
00679     * does not have to change if we introduce multiple compression types */
00680    info_ptr->iccp_compression = (png_byte)compression_type;
00681 #ifdef PNG_FREE_ME_SUPPORTED
00682    info_ptr->free_me |= PNG_FREE_ICCP;
00683 #endif
00684    info_ptr->valid |= PNG_INFO_iCCP;
00685 }
00686 #endif
00687 
00688 #if defined(PNG_TEXT_SUPPORTED)
00689 void PNGAPI
00690 png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
00691    int num_text)
00692 {
00693    int ret;
00694    ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
00695    if (ret)
00696      png_error(png_ptr, "Insufficient memory to store text");
00697 }
00698 
00699 int /* PRIVATE */
00700 png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
00701    int num_text)
00702 {
00703    int i;
00704 
00705    png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
00706       "text" : (png_const_charp)png_ptr->chunk_name));
00707 
00708    if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
00709       return(0);
00710 
00711    /* Make sure we have enough space in the "text" array in info_struct
00712     * to hold all of the incoming text_ptr objects.
00713     */
00714    if (info_ptr->num_text + num_text > info_ptr->max_text)
00715    {
00716       if (info_ptr->text != NULL)
00717       {
00718          png_textp old_text;
00719          int old_max;
00720 
00721          old_max = info_ptr->max_text;
00722          info_ptr->max_text = info_ptr->num_text + num_text + 8;
00723          old_text = info_ptr->text;
00724          info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
00725             (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
00726          if (info_ptr->text == NULL)
00727            {
00728              png_free(png_ptr, old_text);
00729              return(1);
00730            }
00731          png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
00732             png_sizeof(png_text)));
00733          png_free(png_ptr, old_text);
00734       }
00735       else
00736       {
00737          info_ptr->max_text = num_text + 8;
00738          info_ptr->num_text = 0;
00739          info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
00740             (png_uint_32)(info_ptr->max_text * png_sizeof (png_text)));
00741          if (info_ptr->text == NULL)
00742            return(1);
00743 #ifdef PNG_FREE_ME_SUPPORTED
00744          info_ptr->free_me |= PNG_FREE_TEXT;
00745 #endif
00746       }
00747       png_debug1(3, "allocated %d entries for info_ptr->text\n",
00748          info_ptr->max_text);
00749    }
00750    for (i = 0; i < num_text; i++)
00751    {
00752       png_size_t text_length,key_len;
00753       png_size_t lang_len,lang_key_len;
00754       png_textp textp = &(info_ptr->text[info_ptr->num_text]);
00755 
00756       if (text_ptr[i].key == NULL)
00757           continue;
00758 
00759       key_len = png_strlen(text_ptr[i].key);
00760 
00761       if(text_ptr[i].compression <= 0)
00762       {
00763         lang_len = 0;
00764         lang_key_len = 0;
00765       }
00766       else
00767 #ifdef PNG_iTXt_SUPPORTED
00768       {
00769         /* set iTXt data */
00770         if (text_ptr[i].lang != NULL)
00771           lang_len = png_strlen(text_ptr[i].lang);
00772         else
00773           lang_len = 0;
00774         if (text_ptr[i].lang_key != NULL)
00775           lang_key_len = png_strlen(text_ptr[i].lang_key);
00776         else
00777           lang_key_len = 0;
00778       }
00779 #else
00780       {
00781         png_warning(png_ptr, "iTXt chunk not supported.");
00782         continue;
00783       }
00784 #endif
00785 
00786       if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
00787       {
00788          text_length = 0;
00789 #ifdef PNG_iTXt_SUPPORTED
00790          if(text_ptr[i].compression > 0)
00791             textp->compression = PNG_ITXT_COMPRESSION_NONE;
00792          else
00793 #endif
00794             textp->compression = PNG_TEXT_COMPRESSION_NONE;
00795       }
00796       else
00797       {
00798          text_length = png_strlen(text_ptr[i].text);
00799          textp->compression = text_ptr[i].compression;
00800       }
00801 
00802       textp->key = (png_charp)png_malloc_warn(png_ptr,
00803          (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
00804       if (textp->key == NULL)
00805         return(1);
00806       png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
00807          (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
00808          (int)textp->key);
00809 
00810       png_memcpy(textp->key, text_ptr[i].key,
00811          (png_size_t)(key_len));
00812       *(textp->key+key_len) = '\0';
00813 #ifdef PNG_iTXt_SUPPORTED
00814       if (text_ptr[i].compression > 0)
00815       {
00816          textp->lang=textp->key + key_len + 1;
00817          png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
00818          *(textp->lang+lang_len) = '\0';
00819          textp->lang_key=textp->lang + lang_len + 1;
00820          png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
00821          *(textp->lang_key+lang_key_len) = '\0';
00822          textp->text=textp->lang_key + lang_key_len + 1;
00823       }
00824       else
00825 #endif
00826       {
00827 #ifdef PNG_iTXt_SUPPORTED
00828          textp->lang=NULL;
00829          textp->lang_key=NULL;
00830 #endif
00831          textp->text=textp->key + key_len + 1;
00832       }
00833       if(text_length)
00834          png_memcpy(textp->text, text_ptr[i].text,
00835             (png_size_t)(text_length));
00836       *(textp->text+text_length) = '\0';
00837 
00838 #ifdef PNG_iTXt_SUPPORTED
00839       if(textp->compression > 0)
00840       {
00841          textp->text_length = 0;
00842          textp->itxt_length = text_length;
00843       }
00844       else
00845 #endif
00846       {
00847          textp->text_length = text_length;
00848 #ifdef PNG_iTXt_SUPPORTED
00849          textp->itxt_length = 0;
00850 #endif
00851       }
00852       info_ptr->text[info_ptr->num_text]= *textp;
00853       info_ptr->num_text++;
00854       png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
00855    }
00856    return(0);
00857 }
00858 #endif
00859 
00860 #if defined(PNG_tIME_SUPPORTED)
00861 void PNGAPI
00862 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
00863 {
00864    png_debug1(1, "in %s storage function\n", "tIME");
00865    if (png_ptr == NULL || info_ptr == NULL ||
00866        (png_ptr->mode & PNG_WROTE_tIME))
00867       return;
00868 
00869    png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof (png_time));
00870    info_ptr->valid |= PNG_INFO_tIME;
00871 }
00872 #endif
00873 
00874 #if defined(PNG_tRNS_SUPPORTED)
00875 void PNGAPI
00876 png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
00877    png_bytep trans, int num_trans, png_color_16p trans_values)
00878 {
00879    png_debug1(1, "in %s storage function\n", "tRNS");
00880    if (png_ptr == NULL || info_ptr == NULL)
00881       return;
00882 
00883    if (trans != NULL)
00884    {
00885        /*
00886         * It may not actually be necessary to set png_ptr->trans here;
00887         * we do it for backward compatibility with the way the png_handle_tRNS
00888         * function used to do the allocation.
00889         */
00890 #ifdef PNG_FREE_ME_SUPPORTED
00891        png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
00892 #endif
00893        /* Changed from num_trans to 256 in version 1.2.1 */
00894        png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
00895            (png_uint_32)256);
00896        png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
00897 #ifdef PNG_FREE_ME_SUPPORTED
00898        info_ptr->free_me |= PNG_FREE_TRNS;
00899 #else
00900        png_ptr->flags |= PNG_FLAG_FREE_TRNS;
00901 #endif
00902    }
00903 
00904    if (trans_values != NULL)
00905    {
00906       png_memcpy(&(info_ptr->trans_values), trans_values,
00907          png_sizeof(png_color_16));
00908       if (num_trans == 0)
00909         num_trans = 1;
00910    }
00911    info_ptr->num_trans = (png_uint_16)num_trans;
00912    info_ptr->valid |= PNG_INFO_tRNS;
00913 }
00914 #endif
00915 
00916 #if defined(PNG_sPLT_SUPPORTED)
00917 void PNGAPI
00918 png_set_sPLT(png_structp png_ptr,
00919              png_infop info_ptr, png_sPLT_tp entries, int nentries)
00920 {
00921     png_sPLT_tp np;
00922     int i;
00923 
00924     np = (png_sPLT_tp)png_malloc_warn(png_ptr,
00925         (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t));
00926     if (np == NULL)
00927     {
00928       png_warning(png_ptr, "No memory for sPLT palettes.");
00929       return;
00930     }
00931 
00932     png_memcpy(np, info_ptr->splt_palettes,
00933            info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t));
00934     png_free(png_ptr, info_ptr->splt_palettes);
00935     info_ptr->splt_palettes=NULL;
00936 
00937     for (i = 0; i < nentries; i++)
00938     {
00939         png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
00940         png_sPLT_tp from = entries + i;
00941 
00942         to->name = (png_charp)png_malloc(png_ptr,
00943             png_strlen(from->name) + 1);
00944         /* TODO: use png_malloc_warn */
00945         png_strcpy(to->name, from->name);
00946         to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
00947             from->nentries * png_sizeof(png_sPLT_t));
00948         /* TODO: use png_malloc_warn */
00949         png_memcpy(to->entries, from->entries,
00950             from->nentries * png_sizeof(png_sPLT_t));
00951         to->nentries = from->nentries;
00952         to->depth = from->depth;
00953     }
00954 
00955     info_ptr->splt_palettes = np;
00956     info_ptr->splt_palettes_num += nentries;
00957     info_ptr->valid |= PNG_INFO_sPLT;
00958 #ifdef PNG_FREE_ME_SUPPORTED
00959     info_ptr->free_me |= PNG_FREE_SPLT;
00960 #endif
00961 }
00962 #endif /* PNG_sPLT_SUPPORTED */
00963 
00964 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
00965 void PNGAPI
00966 png_set_unknown_chunks(png_structp png_ptr,
00967    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
00968 {
00969     png_unknown_chunkp np;
00970     int i;
00971 
00972     if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
00973         return;
00974 
00975     np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
00976         (info_ptr->unknown_chunks_num + num_unknowns) *
00977         png_sizeof(png_unknown_chunk));
00978     if (np == NULL)
00979     {
00980        png_warning(png_ptr, "Out of memory while processing unknown chunk.");
00981        return;
00982     }
00983 
00984     png_memcpy(np, info_ptr->unknown_chunks,
00985            info_ptr->unknown_chunks_num * png_sizeof(png_unknown_chunk));
00986     png_free(png_ptr, info_ptr->unknown_chunks);
00987     info_ptr->unknown_chunks=NULL;
00988 
00989     for (i = 0; i < num_unknowns; i++)
00990     {
00991         png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
00992         png_unknown_chunkp from = unknowns + i;
00993 
00994         png_strncpy((png_charp)to->name, (png_charp)from->name, 5);
00995         to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
00996         if (to->data == NULL)
00997         {
00998            png_warning(png_ptr, "Out of memory processing unknown chunk.");
00999         }
01000         else
01001         {
01002            png_memcpy(to->data, from->data, from->size);
01003            to->size = from->size;
01004 
01005            /* note our location in the read or write sequence */
01006            to->location = (png_byte)(png_ptr->mode & 0xff);
01007         }
01008     }
01009 
01010     info_ptr->unknown_chunks = np;
01011     info_ptr->unknown_chunks_num += num_unknowns;
01012 #ifdef PNG_FREE_ME_SUPPORTED
01013     info_ptr->free_me |= PNG_FREE_UNKN;
01014 #endif
01015 }
01016 void PNGAPI
01017 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
01018    int chunk, int location)
01019 {
01020    if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
01021          (int)info_ptr->unknown_chunks_num)
01022       info_ptr->unknown_chunks[chunk].location = (png_byte)location;
01023 }
01024 #endif
01025 
01026 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
01027     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
01028 void PNGAPI
01029 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
01030 {
01031    /* This function is deprecated in favor of png_permit_mng_features()
01032       and will be removed from libpng-2.0.0 */
01033    png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
01034    if (png_ptr == NULL)
01035       return;
01036    png_ptr->mng_features_permitted = (png_byte)
01037      ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
01038      ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
01039 }
01040 #endif
01041 
01042 #if defined(PNG_MNG_FEATURES_SUPPORTED)
01043 png_uint_32 PNGAPI
01044 png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
01045 {
01046    png_debug(1, "in png_permit_mng_features\n");
01047    if (png_ptr == NULL)
01048       return (png_uint_32)0;
01049    png_ptr->mng_features_permitted =
01050      (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
01051    return (png_uint_32)png_ptr->mng_features_permitted;
01052 }
01053 #endif
01054 
01055 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
01056 void PNGAPI
01057 png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
01058    chunk_list, int num_chunks)
01059 {
01060     png_bytep new_list, p;
01061     int i, old_num_chunks;
01062     if (num_chunks == 0)
01063     {
01064       if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
01065         png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
01066       else
01067         png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
01068 
01069       if(keep == PNG_HANDLE_CHUNK_ALWAYS)
01070         png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
01071       else
01072         png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
01073       return;
01074     }
01075     if (chunk_list == NULL)
01076       return;
01077     old_num_chunks=png_ptr->num_chunk_list;
01078     new_list=(png_bytep)png_malloc(png_ptr,
01079        (png_uint_32)(5*(num_chunks+old_num_chunks)));
01080     if(png_ptr->chunk_list != NULL)
01081     {
01082        png_memcpy(new_list, png_ptr->chunk_list,
01083           (png_size_t)(5*old_num_chunks));
01084        png_free(png_ptr, png_ptr->chunk_list);
01085        png_ptr->chunk_list=NULL;
01086     }
01087     png_memcpy(new_list+5*old_num_chunks, chunk_list,
01088        (png_size_t)(5*num_chunks));
01089     for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
01090        *p=(png_byte)keep;
01091     png_ptr->num_chunk_list=old_num_chunks+num_chunks;
01092     png_ptr->chunk_list=new_list;
01093 #ifdef PNG_FREE_ME_SUPPORTED
01094     png_ptr->free_me |= PNG_FREE_LIST;
01095 #endif
01096 }
01097 #endif
01098 
01099 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
01100 void PNGAPI
01101 png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
01102    png_user_chunk_ptr read_user_chunk_fn)
01103 {
01104    png_debug(1, "in png_set_read_user_chunk_fn\n");
01105    png_ptr->read_user_chunk_fn = read_user_chunk_fn;
01106    png_ptr->user_chunk_ptr = user_chunk_ptr;
01107 }
01108 #endif
01109 
01110 #if defined(PNG_INFO_IMAGE_SUPPORTED)
01111 void PNGAPI
01112 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
01113 {
01114    png_debug1(1, "in %s storage function\n", "rows");
01115 
01116    if (png_ptr == NULL || info_ptr == NULL)
01117       return;
01118 
01119    if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
01120       png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
01121    info_ptr->row_pointers = row_pointers;
01122    if(row_pointers)
01123       info_ptr->valid |= PNG_INFO_IDAT;
01124 }
01125 #endif
01126 
01127 #ifdef PNG_WRITE_SUPPORTED
01128 void PNGAPI
01129 png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
01130 {
01131     if(png_ptr->zbuf)
01132        png_free(png_ptr, png_ptr->zbuf);
01133     png_ptr->zbuf_size = (png_size_t)size;
01134     png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
01135     png_ptr->zstream.next_out = png_ptr->zbuf;
01136     png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
01137 }
01138 #endif
01139 
01140 void PNGAPI
01141 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
01142 {
01143    if (png_ptr && info_ptr)
01144       info_ptr->valid &= ~(mask);
01145 }
01146 
01147 
01148 #ifndef PNG_1_0_X
01149 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
01150 /* this function was added to libpng 1.2.0 and should always exist by default */
01151 void PNGAPI
01152 png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
01153 {
01154     png_uint_32 settable_asm_flags;
01155     png_uint_32 settable_mmx_flags;
01156 
01157     settable_mmx_flags =
01158 #ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
01159                          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
01160 #endif
01161 #ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
01162                          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
01163 #endif
01164 #ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
01165                          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
01166                          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
01167                          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
01168                          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
01169 #endif
01170                          0;
01171 
01172     /* could be some non-MMX ones in the future, but not currently: */
01173     settable_asm_flags = settable_mmx_flags;
01174 
01175     if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
01176         !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
01177     {
01178         /* clear all MMX flags if MMX isn't supported */
01179         settable_asm_flags &= ~settable_mmx_flags;
01180         png_ptr->asm_flags &= ~settable_mmx_flags;
01181     }
01182 
01183     /* we're replacing the settable bits with those passed in by the user,
01184      * so first zero them out of the master copy, then logical-OR in the
01185      * allowed subset that was requested */
01186 
01187     png_ptr->asm_flags &= ~settable_asm_flags;               /* zero them */
01188     png_ptr->asm_flags |= (asm_flags & settable_asm_flags);  /* set them */
01189 }
01190 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
01191 
01192 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
01193 /* this function was added to libpng 1.2.0 */
01194 void PNGAPI
01195 png_set_mmx_thresholds (png_structp png_ptr,
01196                         png_byte mmx_bitdepth_threshold,
01197                         png_uint_32 mmx_rowbytes_threshold)
01198 {
01199     png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
01200     png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
01201 }
01202 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
01203 
01204 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
01205 /* this function was added to libpng 1.2.6 */
01206 void PNGAPI
01207 png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
01208     png_uint_32 user_height_max)
01209 {
01210     /* Images with dimensions larger than these limits will be
01211      * rejected by png_set_IHDR().  To accept any PNG datastream
01212      * regardless of dimensions, set both limits to 0x7ffffffL.
01213      */
01214     png_ptr->user_width_max = user_width_max;
01215     png_ptr->user_height_max = user_height_max;
01216 }
01217 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
01218 
01219 #endif /* ?PNG_1_0_X */