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-
- /* pngset.c - storage of image information into info struct
-
- libpng 1.0 beta 6 - version 0.96
- For conditions of distribution and use, see copyright notice in png.h
- Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- Copyright (c) 1996, 1997 Andreas Dilger
- May 12, 1997
- */
-
- #define PNG_INTERNAL
- #include "png.h"
-
- #if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
- void
- png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
- {
- png_debug1(1, "in %s storage function\n", "bKGD");
- if (info_ptr == NULL)
- return;
-
- png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
- info_ptr->valid |= PNG_INFO_bKGD;
- }
- #endif
-
- #if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
- void
- png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
- double white_x, double white_y, double red_x, double red_y,
- double green_x, double green_y, double blue_x, double blue_y)
- {
- png_debug1(1, "in %s storage function\n", "cHRM");
- if (info_ptr == NULL)
- return;
-
- info_ptr->x_white = (float)white_x;
- info_ptr->y_white = (float)white_y;
- info_ptr->x_red = (float)red_x;
- info_ptr->y_red = (float)red_y;
- info_ptr->x_green = (float)green_x;
- info_ptr->y_green = (float)green_y;
- info_ptr->x_blue = (float)blue_x;
- info_ptr->y_blue = (float)blue_y;
- info_ptr->valid |= PNG_INFO_cHRM;
- }
- #endif
-
- #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
- void
- png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
- {
- png_debug1(1, "in %s storage function\n", "gAMA");
- if (info_ptr == NULL)
- return;
-
- info_ptr->gamma = (float)file_gamma;
- info_ptr->valid |= PNG_INFO_gAMA;
- }
- #endif
-
- #if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
- void
- png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
- {
- png_debug1(1, "in %s storage function\n", "hIST");
- if (info_ptr == NULL)
- return;
-
- info_ptr->hist = hist;
- info_ptr->valid |= PNG_INFO_hIST;
- }
- #endif
-
- void
- png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
- png_uint_32 width, png_uint_32 height, int bit_depth,
- int color_type, int interlace_type, int compression_type,
- int filter_type)
- {
- png_debug1(1, "in %s storage function\n", "IHDR");
- if (info_ptr == NULL)
- return;
-
- info_ptr->width = width;
- info_ptr->height = height;
- info_ptr->bit_depth = (png_byte)bit_depth;
- info_ptr->color_type =(png_byte) color_type;
- info_ptr->compression_type = (png_byte)compression_type;
- info_ptr->filter_type = (png_byte)filter_type;
- info_ptr->interlace_type = (png_byte)interlace_type;
- if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
- info_ptr->channels = 1;
- else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
- info_ptr->channels = 3;
- else
- info_ptr->channels = 1;
- if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
- info_ptr->channels++;
- info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
- info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
- }
-
- #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
- void
- png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
- png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
- {
- png_debug1(1, "in %s storage function\n", "oFFs");
- if (info_ptr == NULL)
- return;
-
- info_ptr->x_offset = offset_x;
- info_ptr->y_offset = offset_y;
- info_ptr->offset_unit_type = (png_byte)unit_type;
- info_ptr->valid |= PNG_INFO_oFFs;
- }
- #endif
-
- #if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
- void
- png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
- png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
- png_charp units, png_charpp params)
- {
- png_size_t length;
- int i;
-
- png_debug1(1, "in %s storage function\n", "pCAL");
- if (info_ptr == NULL)
- return;
-
- length = png_strlen(purpose) + 1;
- png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
- info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
- png_memcpy(info_ptr->pcal_purpose, purpose, length);
-
- png_debug(3, "storing X0, X1, type, and nparams in info\n");
- info_ptr->pcal_X0 = X0;
- info_ptr->pcal_X1 = X1;
- info_ptr->pcal_type = (png_byte)type;
- info_ptr->pcal_nparams = (png_byte)nparams;
-
- length = png_strlen(units) + 1;
- png_debug1(3, "allocating units for info (%d bytes)\n", length);
- info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
- png_memcpy(info_ptr->pcal_units, units, length);
-
- info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
- (nparams + 1) * sizeof(png_charp));
- info_ptr->pcal_params[nparams] = NULL;
-
- for (i = 0; i < nparams; i++)
- {
- length = png_strlen(params[i]) + 1;
- png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
- info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
- png_memcpy(info_ptr->pcal_params[i], params[i], length);
- }
-
- info_ptr->valid |= PNG_INFO_pCAL;
- }
- #endif
-
- #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
- void
- png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
- png_uint_32 res_x, png_uint_32 res_y, int unit_type)
- {
- png_debug1(1, "in %s storage function\n", "pHYs");
- if (info_ptr == NULL)
- return;
-
- info_ptr->x_pixels_per_unit = res_x;
- info_ptr->y_pixels_per_unit = res_y;
- info_ptr->phys_unit_type = (png_byte)unit_type;
- info_ptr->valid |= PNG_INFO_pHYs;
- }
- #endif
-
- void
- png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
- png_colorp palette, int num_palette)
- {
- png_debug1(1, "in %s storage function\n", "PLTE");
- if (info_ptr == NULL)
- return;
-
- info_ptr->palette = palette;
- info_ptr->num_palette = (png_uint_16)num_palette;
- info_ptr->valid |= PNG_INFO_PLTE;
- }
-
- #if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
- void
- png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
- png_color_8p sig_bit)
- {
- png_debug1(1, "in %s storage function\n", "sBIT");
- if (info_ptr == NULL)
- return;
-
- png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
- info_ptr->valid |= PNG_INFO_sBIT;
- }
- #endif
-
- #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
- defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
- void
- png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
- int num_text)
- {
- int i;
-
- png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
- "text" : png_ptr->chunk_name));
-
- if (info_ptr == NULL || num_text == 0)
- return;
-
- /* Make sure we have enough space in the "text" array in info_struct
- * to hold all of the incoming text_ptr objects.
- */
- if (info_ptr->num_text + num_text > info_ptr->max_text)
- {
- if (info_ptr->text != NULL)
- {
- png_textp old_text;
- int old_max;
-
- old_max = info_ptr->max_text;
- info_ptr->max_text = info_ptr->num_text + num_text + 8;
- old_text = info_ptr->text;
- info_ptr->text = (png_textp)png_malloc(png_ptr,
- info_ptr->max_text * sizeof (png_text));
- png_memcpy(info_ptr->text, old_text, old_max * sizeof(png_text));
- png_free(png_ptr, old_text);
- }
- else
- {
- info_ptr->max_text = num_text + 8;
- info_ptr->num_text = 0;
- info_ptr->text = (png_textp)png_malloc(png_ptr,
- info_ptr->max_text * sizeof (png_text));
- }
- png_debug1(3, "allocated %d entries for info_ptr->text\n",
- info_ptr->max_text);
- }
-
- for (i = 0; i < num_text; i++)
- {
- png_textp textp = &(info_ptr->text[info_ptr->num_text]);
-
- if (text_ptr[i].text == NULL)
- text_ptr[i].text = "";
-
- if (text_ptr[i].text[0] == '\0')
- {
- textp->text_length = 0;
- textp->compression = PNG_TEXT_COMPRESSION_NONE;
- }
- else
- {
- textp->text_length = png_strlen(text_ptr[i].text);
- textp->compression = text_ptr[i].compression;
- }
- textp->text = text_ptr[i].text;
- textp->key = text_ptr[i].key;
- info_ptr->num_text++;
- png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
- }
- }
- #endif
-
- #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
- void
- png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
- {
- png_debug1(1, "in %s storage function\n", "tIME");
- if (info_ptr == NULL)
- return;
-
- png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
- info_ptr->valid |= PNG_INFO_tIME;
- }
- #endif
-
- #if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
- void
- png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
- png_bytep trans, int num_trans, png_color_16p trans_values)
- {
- png_debug1(1, "in %s storage function\n", "tRNS");
- if (info_ptr == NULL)
- return;
-
- if (trans != NULL)
- {
- info_ptr->trans = trans;
- }
-
- if (trans_values != NULL)
- {
- png_memcpy(&(info_ptr->trans_values), trans_values,
- sizeof(png_color_16));
- }
- info_ptr->num_trans = (png_uint_16)num_trans;
- info_ptr->valid |= PNG_INFO_tRNS;
- }
- #endif
-
-