| |
| /* pngget.c - retrieval of values from info struct |
| * |
| * libpng 1.00 |
| * 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 |
| * Copyright (c) 1998, Glenn Randers-Pehrson |
| * March 7, 1998 |
| */ |
| |
| #define PNG_INTERNAL |
| #include "png.h" |
| |
| png_uint_32 |
| png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| return(info_ptr->valid & flag); |
| else |
| return(0); |
| } |
| |
| png_uint_32 |
| png_get_rowbytes(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| return(info_ptr->rowbytes); |
| else |
| return(0); |
| } |
| |
| #ifdef PNG_EASY_ACCESS_SUPPORTED |
| /* easy access to info, added in libpng-0.99 */ |
| png_uint_32 |
| png_get_image_width(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->width; |
| } |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_image_height(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->height; |
| } |
| return (0); |
| } |
| |
| png_byte |
| png_get_bit_depth(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->bit_depth; |
| } |
| return (0); |
| } |
| |
| png_byte |
| png_get_color_type(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->color_type; |
| } |
| return (0); |
| } |
| |
| png_byte |
| png_get_filter_type(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->filter_type; |
| } |
| return (0); |
| } |
| |
| png_byte |
| png_get_interlace_type(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->interlace_type; |
| } |
| return (0); |
| } |
| |
| png_byte |
| png_get_compression_type(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| { |
| return info_ptr->compression_type; |
| } |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter"); |
| if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER) |
| return (0); |
| else return (info_ptr->x_pixels_per_unit); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter"); |
| if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER) |
| return (0); |
| else return (info_ptr->y_pixels_per_unit); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter"); |
| if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER || |
| info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit) |
| return (0); |
| else return (info_ptr->x_pixels_per_unit); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| float |
| png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio"); |
| if (info_ptr->x_pixels_per_unit == 0) |
| return ((float)0.0); |
| else |
| return ((float)info_ptr->y_pixels_per_unit |
| /(float)info_ptr->x_pixels_per_unit); |
| } |
| else |
| #endif |
| return ((float)0.0); |
| } |
| |
| png_uint_32 |
| png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns"); |
| if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) |
| return (0); |
| else return (info_ptr->x_offset); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns"); |
| if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) |
| return (0); |
| else return (info_ptr->y_offset); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns"); |
| if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) |
| return (0); |
| else return (info_ptr->x_offset); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 |
| png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr) |
| { |
| #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns"); |
| if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) |
| return (0); |
| else return (info_ptr->y_offset); |
| } |
| else |
| #endif |
| return (0); |
| } |
| |
| #ifdef PNG_INCH_CONVERSIONS |
| png_uint_32 |
| png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
| { |
| return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr) |
| *.03937 +.5) |
| } |
| |
| png_uint_32 |
| png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
| { |
| return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr) |
| *.03937 +.5) |
| } |
| |
| png_uint_32 |
| png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
| { |
| return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr) |
| *.03937 +.5) |
| } |
| |
| float |
| png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr) |
| { |
| return ((float)png_get_x_offset_microns(png_ptr, info_ptr) |
| *.03937/1000000. +.5) |
| } |
| |
| float |
| png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr) |
| { |
| return ((float)png_get_y_offset_microns(png_ptr, info_ptr) |
| *.03937/1000000. +.5) |
| } |
| |
| #if defined(PNG_READ_pHYs_SUPPORTED) |
| png_uint_32 |
| png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
| { |
| png_uint_32 retval = 0; |
| |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs) |
| { |
| png_debug1(1, "in %s retrieval function\n", "pHYs"); |
| if (res_x != NULL) |
| { |
| *res_x = info_ptr->x_pixels_per_unit; |
| retval |= PNG_INFO_pHYs; |
| } |
| if (res_y != NULL) |
| { |
| *res_y = info_ptr->y_pixels_per_unit; |
| retval |= PNG_INFO_pHYs; |
| } |
| if (unit_type != NULL) |
| { |
| *unit_type = (int)info_ptr->phys_unit_type; |
| retval |= PNG_INFO_pHYs; |
| if(unit_type == 1) |
| { |
| if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50); |
| if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50); |
| } |
| } |
| } |
| return (retval); |
| } |
| #endif |
| |
| #endif /* PNG_INCH_CONVERSIONS */ |
| |
| /* png_get_channels really belongs in here, too, but it's been around longer */ |
| #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| |
| png_byte |
| png_get_channels(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| return(info_ptr->channels); |
| else |
| return (0); |
| } |
| |
| png_bytep |
| png_get_signature(png_structp png_ptr, png_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| return(info_ptr->signature); |
| else |
| return (NULL); |
| } |
| |
| #if defined(PNG_READ_bKGD_SUPPORTED) |
| png_uint_32 |
| png_get_bKGD(png_structp png_ptr, png_infop info_ptr, |
| png_color_16p *background) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) |
| && background != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "bKGD"); |
| *background = &(info_ptr->background); |
| return (PNG_INFO_bKGD); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_cHRM_SUPPORTED) |
| png_uint_32 |
| png_get_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) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) |
| { |
| png_debug1(1, "in %s retrieval function\n", "cHRM"); |
| if (white_x != NULL) |
| *white_x = (double)info_ptr->x_white; |
| if (white_y != NULL) |
| *white_y = (double)info_ptr->y_white; |
| if (red_x != NULL) |
| *red_x = (double)info_ptr->x_red; |
| if (red_y != NULL) |
| *red_y = (double)info_ptr->y_red; |
| if (green_x != NULL) |
| *green_x = (double)info_ptr->x_green; |
| if (green_y != NULL) |
| *green_y = (double)info_ptr->y_green; |
| if (blue_x != NULL) |
| *blue_x = (double)info_ptr->x_blue; |
| if (blue_y != NULL) |
| *blue_y = (double)info_ptr->y_blue; |
| return (PNG_INFO_cHRM); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_gAMA_SUPPORTED) |
| png_uint_32 |
| png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
| && file_gamma != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "gAMA"); |
| *file_gamma = (double)info_ptr->gamma; |
| return (PNG_INFO_gAMA); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_sRGB_SUPPORTED) |
| png_uint_32 |
| png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB) |
| && file_srgb_intent != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "sRGB"); |
| *file_srgb_intent = (int)info_ptr->srgb_intent; |
| return (PNG_INFO_sRGB); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_hIST_SUPPORTED) |
| png_uint_32 |
| png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) |
| && hist != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "hIST"); |
| *hist = info_ptr->hist; |
| return (PNG_INFO_hIST); |
| } |
| return (0); |
| } |
| #endif |
| |
| png_uint_32 |
| png_get_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) |
| |
| { |
| if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL && |
| bit_depth != NULL && color_type != NULL) |
| { |
| int pixel_depth, channels; |
| png_uint_32 rowbytes_per_pixel; |
| |
| png_debug1(1, "in %s retrieval function\n", "IHDR"); |
| *width = info_ptr->width; |
| *height = info_ptr->height; |
| *bit_depth = info_ptr->bit_depth; |
| *color_type = info_ptr->color_type; |
| if (compression_type != NULL) |
| *compression_type = info_ptr->compression_type; |
| if (filter_type != NULL) |
| *filter_type = info_ptr->filter_type; |
| if (interlace_type != NULL) |
| *interlace_type = info_ptr->interlace_type; |
| |
| /* check for potential overflow of rowbytes */ |
| if (*color_type == PNG_COLOR_TYPE_PALETTE) |
| channels = 1; |
| else if (*color_type & PNG_COLOR_MASK_COLOR) |
| channels = 3; |
| else |
| channels = 1; |
| if (*color_type & PNG_COLOR_MASK_ALPHA) |
| channels++; |
| pixel_depth = *bit_depth * channels; |
| rowbytes_per_pixel = (pixel_depth + 7) >> 3; |
| if ((*width > (png_uint_32)2147483647L/rowbytes_per_pixel)) |
| { |
| png_warning(png_ptr, |
| "Width too large for libpng to process image data."); |
| } |
| return (1); |
| } |
| return (0); |
| } |
| |
| #if defined(PNG_READ_oFFs_SUPPORTED) |
| png_uint_32 |
| png_get_oFFs(png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) |
| && offset_x != NULL && offset_y != NULL && unit_type != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "oFFs"); |
| *offset_x = info_ptr->x_offset; |
| *offset_y = info_ptr->y_offset; |
| *unit_type = (int)info_ptr->offset_unit_type; |
| return (PNG_INFO_oFFs); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_pCAL_SUPPORTED) |
| png_uint_32 |
| png_get_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) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL && |
| purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && |
| nparams != NULL && units != NULL && params != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "pCAL"); |
| *purpose = info_ptr->pcal_purpose; |
| *X0 = info_ptr->pcal_X0; |
| *X1 = info_ptr->pcal_X1; |
| *type = (int)info_ptr->pcal_type; |
| *nparams = (int)info_ptr->pcal_nparams; |
| *units = info_ptr->pcal_units; |
| *params = info_ptr->pcal_params; |
| return (PNG_INFO_pCAL); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_pHYs_SUPPORTED) |
| png_uint_32 |
| png_get_pHYs(png_structp png_ptr, png_infop info_ptr, |
| png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
| { |
| png_uint_32 retval = 0; |
| |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs) |
| { |
| png_debug1(1, "in %s retrieval function\n", "pHYs"); |
| if (res_x != NULL) |
| { |
| *res_x = info_ptr->x_pixels_per_unit; |
| retval |= PNG_INFO_pHYs; |
| } |
| if (res_y != NULL) |
| { |
| *res_y = info_ptr->y_pixels_per_unit; |
| retval |= PNG_INFO_pHYs; |
| } |
| if (unit_type != NULL) |
| { |
| *unit_type = (int)info_ptr->phys_unit_type; |
| retval |= PNG_INFO_pHYs; |
| } |
| } |
| return (retval); |
| } |
| #endif |
| |
| png_uint_32 |
| png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette, |
| int *num_palette) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE && |
| palette != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "PLTE"); |
| *palette = info_ptr->palette; |
| *num_palette = info_ptr->num_palette; |
| png_debug1(3, "num_palette = %d\n", *num_palette); |
| return (PNG_INFO_PLTE); |
| } |
| return (0); |
| } |
| |
| #if defined(PNG_READ_sBIT_SUPPORTED) |
| png_uint_32 |
| png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT && |
| sig_bit != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "sBIT"); |
| *sig_bit = &(info_ptr->sig_bit); |
| return (PNG_INFO_sBIT); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) |
| png_uint_32 |
| png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr, |
| int *num_text) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) |
| { |
| png_debug1(1, "in %s retrieval function\n", |
| (png_ptr->chunk_name[0] == '\0' ? "text" |
| : (png_const_charp)png_ptr->chunk_name)); |
| if (text_ptr != NULL) |
| *text_ptr = info_ptr->text; |
| if (num_text != NULL) |
| *num_text = info_ptr->num_text; |
| return ((png_uint_32)info_ptr->num_text); |
| } |
| return(0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_tIME_SUPPORTED) |
| png_uint_32 |
| png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME && |
| mod_time != NULL) |
| { |
| png_debug1(1, "in %s retrieval function\n", "tIME"); |
| *mod_time = &(info_ptr->mod_time); |
| return (PNG_INFO_tIME); |
| } |
| return (0); |
| } |
| #endif |
| |
| #if defined(PNG_READ_tRNS_SUPPORTED) |
| png_uint_32 |
| png_get_tRNS(png_structp png_ptr, png_infop info_ptr, |
| png_bytep *trans, int *num_trans, png_color_16p *trans_values) |
| { |
| png_uint_32 retval = 0; |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS) |
| { |
| png_debug1(1, "in %s retrieval function\n", "tRNS"); |
| if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| { |
| if (trans != NULL) |
| { |
| *trans = info_ptr->trans; |
| retval |= PNG_INFO_tRNS; |
| } |
| if (trans_values != NULL) |
| *trans_values = &(info_ptr->trans_values); |
| } |
| else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */ |
| { |
| if (trans_values != NULL) |
| { |
| *trans_values = &(info_ptr->trans_values); |
| retval |= PNG_INFO_tRNS; |
| } |
| if(trans != NULL) |
| *trans = NULL; |
| } |
| if(num_trans != NULL) |
| { |
| *num_trans = info_ptr->num_trans; |
| retval |= PNG_INFO_tRNS; |
| } |
| } |
| return (retval); |
| } |
| #endif |
| |