1371 lines
37 KiB
C
1371 lines
37 KiB
C
/* pngget.c - retrieval of values from info struct
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*
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* Copyright (c) 2018-2024 Cosmin Truta
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* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
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* Copyright (c) 1996-1997 Andreas Dilger
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* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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*/
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#include "pngpriv.h"
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#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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png_uint_32 PNGAPI
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png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
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png_uint_32 flag)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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{
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#ifdef PNG_READ_tRNS_SUPPORTED
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/* png_handle_PLTE() may have canceled a valid tRNS chunk but left the
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* 'valid' flag for the detection of duplicate chunks. Do not report a
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* valid tRNS chunk in this case.
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*/
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if (flag == PNG_INFO_tRNS && png_ptr->num_trans == 0)
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return 0;
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#endif
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return info_ptr->valid & flag;
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}
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return 0;
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}
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size_t PNGAPI
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png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->rowbytes;
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return 0;
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}
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#ifdef PNG_INFO_IMAGE_SUPPORTED
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png_bytepp PNGAPI
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png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->row_pointers;
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return 0;
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}
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#endif
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#ifdef PNG_EASY_ACCESS_SUPPORTED
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/* Easy access to info, added in libpng-0.99 */
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png_uint_32 PNGAPI
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png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->width;
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return 0;
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}
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png_uint_32 PNGAPI
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png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->height;
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return 0;
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}
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png_byte PNGAPI
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png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->bit_depth;
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return 0;
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}
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png_byte PNGAPI
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png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->color_type;
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return 0;
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}
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png_byte PNGAPI
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png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->filter_type;
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return 0;
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}
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png_byte PNGAPI
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png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->interlace_type;
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return 0;
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}
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png_byte PNGAPI
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png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->compression_type;
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return 0;
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}
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png_uint_32 PNGAPI
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png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
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info_ptr)
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{
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#ifdef PNG_pHYs_SUPPORTED
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png_debug(1, "in png_get_x_pixels_per_meter");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_pHYs) != 0)
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{
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if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
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return info_ptr->x_pixels_per_unit;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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png_uint_32 PNGAPI
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png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
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info_ptr)
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{
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#ifdef PNG_pHYs_SUPPORTED
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png_debug(1, "in png_get_y_pixels_per_meter");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_pHYs) != 0)
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{
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if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
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return info_ptr->y_pixels_per_unit;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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png_uint_32 PNGAPI
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png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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#ifdef PNG_pHYs_SUPPORTED
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png_debug(1, "in png_get_pixels_per_meter");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_pHYs) != 0)
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{
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if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
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info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
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return info_ptr->x_pixels_per_unit;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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float PNGAPI
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png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
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info_ptr)
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{
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#ifdef PNG_READ_pHYs_SUPPORTED
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png_debug(1, "in png_get_pixel_aspect_ratio");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_pHYs) != 0)
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{
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if (info_ptr->x_pixels_per_unit != 0)
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return (float)info_ptr->y_pixels_per_unit
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/ (float)info_ptr->x_pixels_per_unit;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return (float)0.0;
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}
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#endif
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#ifdef PNG_FIXED_POINT_SUPPORTED
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png_fixed_point PNGAPI
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png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
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png_const_inforp info_ptr)
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{
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#ifdef PNG_READ_pHYs_SUPPORTED
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png_debug(1, "in png_get_pixel_aspect_ratio_fixed");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_pHYs) != 0 &&
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info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&
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info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&
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info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
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{
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png_fixed_point res;
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/* The following casts work because a PNG 4 byte integer only has a valid
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* range of 0..2^31-1; otherwise the cast might overflow.
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*/
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if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
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(png_int_32)info_ptr->x_pixels_per_unit) != 0)
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return res;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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#endif
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png_int_32 PNGAPI
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png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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#ifdef PNG_oFFs_SUPPORTED
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png_debug(1, "in png_get_x_offset_microns");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_oFFs) != 0)
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{
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if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
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return info_ptr->x_offset;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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png_int_32 PNGAPI
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png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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#ifdef PNG_oFFs_SUPPORTED
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png_debug(1, "in png_get_y_offset_microns");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_oFFs) != 0)
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{
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if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
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return info_ptr->y_offset;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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png_int_32 PNGAPI
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png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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#ifdef PNG_oFFs_SUPPORTED
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png_debug(1, "in png_get_x_offset_pixels");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_oFFs) != 0)
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{
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if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
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return info_ptr->x_offset;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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png_int_32 PNGAPI
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png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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#ifdef PNG_oFFs_SUPPORTED
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png_debug(1, "in png_get_y_offset_pixels");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_oFFs) != 0)
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{
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if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
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return info_ptr->y_offset;
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}
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#else
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PNG_UNUSED(png_ptr)
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PNG_UNUSED(info_ptr)
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#endif
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return 0;
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}
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#ifdef PNG_INCH_CONVERSIONS_SUPPORTED
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static png_uint_32
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ppi_from_ppm(png_uint_32 ppm)
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{
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#if 0
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/* The conversion is *(2.54/100), in binary (32 digits):
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* .00000110100000001001110101001001
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*/
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png_uint_32 t1001, t1101;
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ppm >>= 1; /* .1 */
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t1001 = ppm + (ppm >> 3); /* .1001 */
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t1101 = t1001 + (ppm >> 1); /* .1101 */
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ppm >>= 20; /* .000000000000000000001 */
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t1101 += t1101 >> 15; /* .1101000000000001101 */
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t1001 >>= 11; /* .000000000001001 */
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t1001 += t1001 >> 12; /* .000000000001001000000001001 */
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ppm += t1001; /* .000000000001001000001001001 */
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ppm += t1101; /* .110100000001001110101001001 */
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return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
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#else
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/* The argument is a PNG unsigned integer, so it is not permitted
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* to be bigger than 2^31.
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*/
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png_fixed_point result;
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if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
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5000) != 0)
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return (png_uint_32)result;
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/* Overflow. */
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return 0;
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#endif
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}
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png_uint_32 PNGAPI
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png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
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}
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png_uint_32 PNGAPI
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png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
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}
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png_uint_32 PNGAPI
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png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
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}
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#ifdef PNG_FIXED_POINT_SUPPORTED
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static png_fixed_point
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png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
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{
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/* Convert from meters * 1,000,000 to inches * 100,000, meters to
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* inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
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* Notice that this can overflow - a warning is output and 0 is
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* returned.
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*/
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png_fixed_point result;
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if (png_muldiv(&result, microns, 500, 127) != 0)
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return result;
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png_warning(png_ptr, "fixed point overflow ignored");
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return 0;
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}
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png_fixed_point PNGAPI
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png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
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png_const_inforp info_ptr)
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{
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return png_fixed_inches_from_microns(png_ptr,
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png_get_x_offset_microns(png_ptr, info_ptr));
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}
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#endif /* FIXED_POINT */
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#ifdef PNG_FIXED_POINT_SUPPORTED
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png_fixed_point PNGAPI
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png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
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png_const_inforp info_ptr)
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{
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return png_fixed_inches_from_microns(png_ptr,
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png_get_y_offset_microns(png_ptr, info_ptr));
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}
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#endif
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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float PNGAPI
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png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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/* To avoid the overflow do the conversion directly in floating
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* point.
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*/
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return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
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}
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#endif
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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float PNGAPI
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png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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/* To avoid the overflow do the conversion directly in floating
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* point.
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*/
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return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
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}
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#endif
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#ifdef PNG_pHYs_SUPPORTED
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png_uint_32 PNGAPI
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png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
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png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
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{
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png_uint_32 retval = 0;
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png_debug1(1, "in %s retrieval function", "pHYs");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_pHYs) != 0)
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{
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if (res_x != NULL)
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{
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*res_x = info_ptr->x_pixels_per_unit;
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retval |= PNG_INFO_pHYs;
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}
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if (res_y != NULL)
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{
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*res_y = info_ptr->y_pixels_per_unit;
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retval |= PNG_INFO_pHYs;
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}
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if (unit_type != NULL)
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{
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*unit_type = (int)info_ptr->phys_unit_type;
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retval |= PNG_INFO_pHYs;
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if (*unit_type == 1)
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{
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if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
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if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
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}
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}
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}
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return retval;
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}
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#endif /* pHYs */
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#endif /* INCH_CONVERSIONS */
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/* png_get_channels really belongs in here, too, but it's been around longer */
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#endif /* EASY_ACCESS */
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png_byte PNGAPI
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png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->channels;
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return 0;
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}
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#ifdef PNG_READ_SUPPORTED
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png_const_bytep PNGAPI
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png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
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{
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if (png_ptr != NULL && info_ptr != NULL)
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return info_ptr->signature;
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return NULL;
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}
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#endif
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#ifdef PNG_bKGD_SUPPORTED
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png_uint_32 PNGAPI
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png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
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png_color_16p *background)
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{
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png_debug1(1, "in %s retrieval function", "bKGD");
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if (png_ptr != NULL && info_ptr != NULL &&
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(info_ptr->valid & PNG_INFO_bKGD) != 0 &&
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background != NULL)
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|
{
|
|
*background = &(info_ptr->background);
|
|
return PNG_INFO_bKGD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_cHRM_SUPPORTED
|
|
/* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
|
|
* same time to correct the rgb grayscale coefficient defaults obtained from the
|
|
* cHRM chunk in 1.5.4
|
|
*/
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
double *whitex, double *whitey, double *redx, double *redy,
|
|
double *greenx, double *greeny, double *bluex, double *bluey)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "cHRM");
|
|
|
|
/* PNGv3: this just returns the values store from the cHRM, if any. */
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cHRM) != 0)
|
|
{
|
|
if (whitex != NULL)
|
|
*whitex = png_float(png_ptr, info_ptr->cHRM.whitex, "cHRM wx");
|
|
if (whitey != NULL)
|
|
*whitey = png_float(png_ptr, info_ptr->cHRM.whitey, "cHRM wy");
|
|
if (redx != NULL)
|
|
*redx = png_float(png_ptr, info_ptr->cHRM.redx, "cHRM rx");
|
|
if (redy != NULL)
|
|
*redy = png_float(png_ptr, info_ptr->cHRM.redy, "cHRM ry");
|
|
if (greenx != NULL)
|
|
*greenx = png_float(png_ptr, info_ptr->cHRM.greenx, "cHRM gx");
|
|
if (greeny != NULL)
|
|
*greeny = png_float(png_ptr, info_ptr->cHRM.greeny, "cHRM gy");
|
|
if (bluex != NULL)
|
|
*bluex = png_float(png_ptr, info_ptr->cHRM.bluex, "cHRM bx");
|
|
if (bluey != NULL)
|
|
*bluey = png_float(png_ptr, info_ptr->cHRM.bluey, "cHRM by");
|
|
return PNG_INFO_cHRM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
double *red_X, double *red_Y, double *red_Z, double *green_X,
|
|
double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
|
|
double *blue_Z)
|
|
{
|
|
png_XYZ XYZ;
|
|
png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cHRM) != 0 &&
|
|
png_XYZ_from_xy(&XYZ, &info_ptr->cHRM) == 0)
|
|
{
|
|
if (red_X != NULL)
|
|
*red_X = png_float(png_ptr, XYZ.red_X, "cHRM red X");
|
|
if (red_Y != NULL)
|
|
*red_Y = png_float(png_ptr, XYZ.red_Y, "cHRM red Y");
|
|
if (red_Z != NULL)
|
|
*red_Z = png_float(png_ptr, XYZ.red_Z, "cHRM red Z");
|
|
if (green_X != NULL)
|
|
*green_X = png_float(png_ptr, XYZ.green_X, "cHRM green X");
|
|
if (green_Y != NULL)
|
|
*green_Y = png_float(png_ptr, XYZ.green_Y, "cHRM green Y");
|
|
if (green_Z != NULL)
|
|
*green_Z = png_float(png_ptr, XYZ.green_Z, "cHRM green Z");
|
|
if (blue_X != NULL)
|
|
*blue_X = png_float(png_ptr, XYZ.blue_X, "cHRM blue X");
|
|
if (blue_Y != NULL)
|
|
*blue_Y = png_float(png_ptr, XYZ.blue_Y, "cHRM blue Y");
|
|
if (blue_Z != NULL)
|
|
*blue_Z = png_float(png_ptr, XYZ.blue_Z, "cHRM blue Z");
|
|
return PNG_INFO_cHRM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
# ifdef PNG_FIXED_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
|
|
png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
|
|
png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
|
|
png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
|
|
png_fixed_point *int_blue_Z)
|
|
{
|
|
png_XYZ XYZ;
|
|
png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cHRM) != 0U &&
|
|
png_XYZ_from_xy(&XYZ, &info_ptr->cHRM) == 0)
|
|
{
|
|
if (int_red_X != NULL) *int_red_X = XYZ.red_X;
|
|
if (int_red_Y != NULL) *int_red_Y = XYZ.red_Y;
|
|
if (int_red_Z != NULL) *int_red_Z = XYZ.red_Z;
|
|
if (int_green_X != NULL) *int_green_X = XYZ.green_X;
|
|
if (int_green_Y != NULL) *int_green_Y = XYZ.green_Y;
|
|
if (int_green_Z != NULL) *int_green_Z = XYZ.green_Z;
|
|
if (int_blue_X != NULL) *int_blue_X = XYZ.blue_X;
|
|
if (int_blue_Y != NULL) *int_blue_Y = XYZ.blue_Y;
|
|
if (int_blue_Z != NULL) *int_blue_Z = XYZ.blue_Z;
|
|
return PNG_INFO_cHRM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_fixed_point *whitex, png_fixed_point *whitey, png_fixed_point *redx,
|
|
png_fixed_point *redy, png_fixed_point *greenx, png_fixed_point *greeny,
|
|
png_fixed_point *bluex, png_fixed_point *bluey)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "cHRM");
|
|
|
|
/* PNGv3: this just returns the values store from the cHRM, if any. */
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cHRM) != 0)
|
|
{
|
|
if (whitex != NULL) *whitex = info_ptr->cHRM.whitex;
|
|
if (whitey != NULL) *whitey = info_ptr->cHRM.whitey;
|
|
if (redx != NULL) *redx = info_ptr->cHRM.redx;
|
|
if (redy != NULL) *redy = info_ptr->cHRM.redy;
|
|
if (greenx != NULL) *greenx = info_ptr->cHRM.greenx;
|
|
if (greeny != NULL) *greeny = info_ptr->cHRM.greeny;
|
|
if (bluex != NULL) *bluex = info_ptr->cHRM.bluex;
|
|
if (bluey != NULL) *bluey = info_ptr->cHRM.bluey;
|
|
return PNG_INFO_cHRM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef PNG_gAMA_SUPPORTED
|
|
# ifdef PNG_FIXED_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_fixed_point *file_gamma)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "gAMA");
|
|
|
|
/* PNGv3 compatibility: only report gAMA if it is really present. */
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_gAMA) != 0)
|
|
{
|
|
if (file_gamma != NULL) *file_gamma = info_ptr->gamma;
|
|
return PNG_INFO_gAMA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
double *file_gamma)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "gAMA(float)");
|
|
|
|
/* PNGv3 compatibility: only report gAMA if it is really present. */
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_gAMA) != 0)
|
|
{
|
|
if (file_gamma != NULL)
|
|
*file_gamma = png_float(png_ptr, info_ptr->gamma, "gAMA");
|
|
|
|
return PNG_INFO_gAMA;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef PNG_sRGB_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
int *file_srgb_intent)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "sRGB");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_sRGB) != 0)
|
|
{
|
|
if (file_srgb_intent != NULL)
|
|
*file_srgb_intent = info_ptr->rendering_intent;
|
|
return PNG_INFO_sRGB;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_iCCP_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_charpp name, int *compression_type,
|
|
png_bytepp profile, png_uint_32 *proflen)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "iCCP");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_iCCP) != 0 &&
|
|
name != NULL && profile != NULL && proflen != NULL)
|
|
{
|
|
*name = info_ptr->iccp_name;
|
|
*profile = info_ptr->iccp_profile;
|
|
*proflen = png_get_uint_32(info_ptr->iccp_profile);
|
|
/* This is somewhat irrelevant since the profile data returned has
|
|
* actually been uncompressed.
|
|
*/
|
|
if (compression_type != NULL)
|
|
*compression_type = PNG_COMPRESSION_TYPE_BASE;
|
|
return PNG_INFO_iCCP;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_sPLT_SUPPORTED
|
|
int PNGAPI
|
|
png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_sPLT_tpp spalettes)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "sPLT");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
|
|
{
|
|
*spalettes = info_ptr->splt_palettes;
|
|
return info_ptr->splt_palettes_num;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_cICP_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_cICP(png_const_structrp png_ptr,
|
|
png_const_inforp info_ptr, png_bytep colour_primaries,
|
|
png_bytep transfer_function, png_bytep matrix_coefficients,
|
|
png_bytep video_full_range_flag)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "cICP");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cICP) != 0 &&
|
|
colour_primaries != NULL && transfer_function != NULL &&
|
|
matrix_coefficients != NULL && video_full_range_flag != NULL)
|
|
{
|
|
*colour_primaries = info_ptr->cicp_colour_primaries;
|
|
*transfer_function = info_ptr->cicp_transfer_function;
|
|
*matrix_coefficients = info_ptr->cicp_matrix_coefficients;
|
|
*video_full_range_flag = info_ptr->cicp_video_full_range_flag;
|
|
return (PNG_INFO_cICP);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_cLLI_SUPPORTED
|
|
# ifdef PNG_FIXED_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_cLLI_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_uint_32p maxCLL,
|
|
png_uint_32p maxFALL)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "cLLI");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cLLI) != 0)
|
|
{
|
|
if (maxCLL != NULL) *maxCLL = info_ptr->maxCLL;
|
|
if (maxFALL != NULL) *maxFALL = info_ptr->maxFALL;
|
|
return PNG_INFO_cLLI;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_cLLI(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
double *maxCLL, double *maxFALL)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "cLLI(float)");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_cLLI) != 0)
|
|
{
|
|
if (maxCLL != NULL) *maxCLL = info_ptr->maxCLL * .0001;
|
|
if (maxFALL != NULL) *maxFALL = info_ptr->maxFALL * .0001;
|
|
return PNG_INFO_cLLI;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
#endif /* cLLI */
|
|
|
|
#ifdef PNG_mDCV_SUPPORTED
|
|
# ifdef PNG_FIXED_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_mDCV_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_fixed_point *white_x, png_fixed_point *white_y,
|
|
png_fixed_point *red_x, png_fixed_point *red_y,
|
|
png_fixed_point *green_x, png_fixed_point *green_y,
|
|
png_fixed_point *blue_x, png_fixed_point *blue_y,
|
|
png_uint_32p mastering_maxDL, png_uint_32p mastering_minDL)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "mDCV");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_mDCV) != 0)
|
|
{
|
|
if (white_x != NULL) *white_x = info_ptr->mastering_white_x * 2;
|
|
if (white_y != NULL) *white_y = info_ptr->mastering_white_y * 2;
|
|
if (red_x != NULL) *red_x = info_ptr->mastering_red_x * 2;
|
|
if (red_y != NULL) *red_y = info_ptr->mastering_red_y * 2;
|
|
if (green_x != NULL) *green_x = info_ptr->mastering_green_x * 2;
|
|
if (green_y != NULL) *green_y = info_ptr->mastering_green_y * 2;
|
|
if (blue_x != NULL) *blue_x = info_ptr->mastering_blue_x * 2;
|
|
if (blue_y != NULL) *blue_y = info_ptr->mastering_blue_y * 2;
|
|
if (mastering_maxDL != NULL) *mastering_maxDL = info_ptr->mastering_maxDL;
|
|
if (mastering_minDL != NULL) *mastering_minDL = info_ptr->mastering_minDL;
|
|
return PNG_INFO_mDCV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif
|
|
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_mDCV(png_const_structrp png_ptr, png_const_inforp 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,
|
|
double *mastering_maxDL, double *mastering_minDL)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "mDCV(float)");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_mDCV) != 0)
|
|
{
|
|
if (white_x != NULL) *white_x = info_ptr->mastering_white_x * .00002;
|
|
if (white_y != NULL) *white_y = info_ptr->mastering_white_y * .00002;
|
|
if (red_x != NULL) *red_x = info_ptr->mastering_red_x * .00002;
|
|
if (red_y != NULL) *red_y = info_ptr->mastering_red_y * .00002;
|
|
if (green_x != NULL) *green_x = info_ptr->mastering_green_x * .00002;
|
|
if (green_y != NULL) *green_y = info_ptr->mastering_green_y * .00002;
|
|
if (blue_x != NULL) *blue_x = info_ptr->mastering_blue_x * .00002;
|
|
if (blue_y != NULL) *blue_y = info_ptr->mastering_blue_y * .00002;
|
|
if (mastering_maxDL != NULL)
|
|
*mastering_maxDL = info_ptr->mastering_maxDL * .0001;
|
|
if (mastering_minDL != NULL)
|
|
*mastering_minDL = info_ptr->mastering_minDL * .0001;
|
|
return PNG_INFO_mDCV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif /* FLOATING_POINT */
|
|
#endif /* mDCV */
|
|
|
|
#ifdef PNG_eXIf_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_bytep *exif)
|
|
{
|
|
png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");
|
|
PNG_UNUSED(info_ptr)
|
|
PNG_UNUSED(exif)
|
|
return 0;
|
|
}
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_uint_32 *num_exif, png_bytep *exif)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "eXIf");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)
|
|
{
|
|
*num_exif = info_ptr->num_exif;
|
|
*exif = info_ptr->exif;
|
|
return PNG_INFO_eXIf;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_hIST_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_uint_16p *hist)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "hIST");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)
|
|
{
|
|
*hist = info_ptr->hist;
|
|
return PNG_INFO_hIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_IHDR(png_const_structrp png_ptr, png_const_inforp 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 retrieval function", "IHDR");
|
|
|
|
if (png_ptr == NULL || info_ptr == NULL)
|
|
return 0;
|
|
|
|
if (width != NULL)
|
|
*width = info_ptr->width;
|
|
|
|
if (height != NULL)
|
|
*height = info_ptr->height;
|
|
|
|
if (bit_depth != NULL)
|
|
*bit_depth = info_ptr->bit_depth;
|
|
|
|
if (color_type != NULL)
|
|
*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;
|
|
|
|
/* This is redundant if we can be sure that the info_ptr values were all
|
|
* assigned in png_set_IHDR(). We do the check anyhow in case an
|
|
* application has ignored our advice not to mess with the members
|
|
* of info_ptr directly.
|
|
*/
|
|
png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
|
|
info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
|
|
info_ptr->compression_type, info_ptr->filter_type);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef PNG_oFFs_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "oFFs");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_oFFs) != 0 &&
|
|
offset_x != NULL && offset_y != NULL && unit_type != NULL)
|
|
{
|
|
*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
|
|
|
|
#ifdef PNG_pCAL_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
|
|
png_charp *units, png_charpp *params)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "pCAL");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_pCAL) != 0 &&
|
|
purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
|
|
nparams != NULL && units != NULL && params != NULL)
|
|
{
|
|
*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
|
|
|
|
#ifdef PNG_sCAL_SUPPORTED
|
|
# ifdef PNG_FIXED_POINT_SUPPORTED
|
|
# if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
|
|
defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
png_uint_32 PNGAPI
|
|
png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
int *unit, png_fixed_point *width, png_fixed_point *height)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "sCAL");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_sCAL) != 0)
|
|
{
|
|
*unit = info_ptr->scal_unit;
|
|
/*TODO: make this work without FP support; the API is currently eliminated
|
|
* if neither floating point APIs nor internal floating point arithmetic
|
|
* are enabled.
|
|
*/
|
|
*width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
|
|
*height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
|
|
"sCAL height");
|
|
return PNG_INFO_sCAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif /* FLOATING_ARITHMETIC */
|
|
# endif /* FIXED_POINT */
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
int *unit, double *width, double *height)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "sCAL(float)");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_sCAL) != 0)
|
|
{
|
|
*unit = info_ptr->scal_unit;
|
|
*width = atof(info_ptr->scal_s_width);
|
|
*height = atof(info_ptr->scal_s_height);
|
|
return PNG_INFO_sCAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
# endif /* FLOATING POINT */
|
|
png_uint_32 PNGAPI
|
|
png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
int *unit, png_charpp width, png_charpp height)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "sCAL(str)");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_sCAL) != 0)
|
|
{
|
|
*unit = info_ptr->scal_unit;
|
|
*width = info_ptr->scal_s_width;
|
|
*height = info_ptr->scal_s_height;
|
|
return PNG_INFO_sCAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* sCAL */
|
|
|
|
#ifdef PNG_pHYs_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
|
png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
|
|
{
|
|
png_uint_32 retval = 0;
|
|
|
|
png_debug1(1, "in %s retrieval function", "pHYs");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_pHYs) != 0)
|
|
{
|
|
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 /* pHYs */
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_colorp *palette, int *num_palette)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "PLTE");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)
|
|
{
|
|
*palette = info_ptr->palette;
|
|
*num_palette = info_ptr->num_palette;
|
|
png_debug1(3, "num_palette = %d", *num_palette);
|
|
return PNG_INFO_PLTE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef PNG_sBIT_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_color_8p *sig_bit)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "sBIT");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)
|
|
{
|
|
*sig_bit = &(info_ptr->sig_bit);
|
|
return PNG_INFO_sBIT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_TEXT_SUPPORTED
|
|
int PNGAPI
|
|
png_get_text(png_const_structrp png_ptr, png_inforp 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 text retrieval function, chunk typeid = 0x%lx",
|
|
(unsigned long)png_ptr->chunk_name);
|
|
|
|
if (text_ptr != NULL)
|
|
*text_ptr = info_ptr->text;
|
|
|
|
if (num_text != NULL)
|
|
*num_text = info_ptr->num_text;
|
|
|
|
return info_ptr->num_text;
|
|
}
|
|
|
|
if (num_text != NULL)
|
|
*num_text = 0;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_tIME_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_timep *mod_time)
|
|
{
|
|
png_debug1(1, "in %s retrieval function", "tIME");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)
|
|
{
|
|
*mod_time = &(info_ptr->mod_time);
|
|
return PNG_INFO_tIME;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_tRNS_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
|
|
{
|
|
png_uint_32 retval = 0;
|
|
|
|
png_debug1(1, "in %s retrieval function", "tRNS");
|
|
|
|
if (png_ptr != NULL && info_ptr != NULL &&
|
|
(info_ptr->valid & PNG_INFO_tRNS) != 0)
|
|
{
|
|
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
|
{
|
|
if (trans_alpha != NULL)
|
|
{
|
|
*trans_alpha = info_ptr->trans_alpha;
|
|
retval |= PNG_INFO_tRNS;
|
|
}
|
|
|
|
if (trans_color != NULL)
|
|
*trans_color = &(info_ptr->trans_color);
|
|
}
|
|
|
|
else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
|
|
{
|
|
if (trans_color != NULL)
|
|
{
|
|
*trans_color = &(info_ptr->trans_color);
|
|
retval |= PNG_INFO_tRNS;
|
|
}
|
|
|
|
if (trans_alpha != NULL)
|
|
*trans_alpha = NULL;
|
|
}
|
|
|
|
if (num_trans != NULL)
|
|
{
|
|
*num_trans = info_ptr->num_trans;
|
|
retval |= PNG_INFO_tRNS;
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
|
|
int PNGAPI
|
|
png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
|
|
png_unknown_chunkpp unknowns)
|
|
{
|
|
if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
|
|
{
|
|
*unknowns = info_ptr->unknown_chunks;
|
|
return info_ptr->unknown_chunks_num;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|
png_byte PNGAPI
|
|
png_get_rgb_to_gray_status(png_const_structrp png_ptr)
|
|
{
|
|
return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_USER_CHUNKS_SUPPORTED
|
|
png_voidp PNGAPI
|
|
png_get_user_chunk_ptr(png_const_structrp png_ptr)
|
|
{
|
|
return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
|
|
}
|
|
#endif
|
|
|
|
size_t PNGAPI
|
|
png_get_compression_buffer_size(png_const_structrp png_ptr)
|
|
{
|
|
if (png_ptr == NULL)
|
|
return 0;
|
|
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
|
|
#endif
|
|
{
|
|
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
return png_ptr->IDAT_read_size;
|
|
#else
|
|
return PNG_IDAT_READ_SIZE;
|
|
#endif
|
|
}
|
|
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
else
|
|
return png_ptr->zbuffer_size;
|
|
#endif
|
|
}
|
|
|
|
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
/* These functions were added to libpng 1.2.6 and were enabled
|
|
* by default in libpng-1.4.0 */
|
|
png_uint_32 PNGAPI
|
|
png_get_user_width_max(png_const_structrp png_ptr)
|
|
{
|
|
return (png_ptr ? png_ptr->user_width_max : 0);
|
|
}
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_user_height_max(png_const_structrp png_ptr)
|
|
{
|
|
return (png_ptr ? png_ptr->user_height_max : 0);
|
|
}
|
|
|
|
/* This function was added to libpng 1.4.0 */
|
|
png_uint_32 PNGAPI
|
|
png_get_chunk_cache_max(png_const_structrp png_ptr)
|
|
{
|
|
return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
|
|
}
|
|
|
|
/* This function was added to libpng 1.4.1 */
|
|
png_alloc_size_t PNGAPI
|
|
png_get_chunk_malloc_max(png_const_structrp png_ptr)
|
|
{
|
|
return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
|
|
}
|
|
#endif /* SET_USER_LIMITS */
|
|
|
|
/* These functions were added to libpng 1.4.0 */
|
|
#ifdef PNG_IO_STATE_SUPPORTED
|
|
png_uint_32 PNGAPI
|
|
png_get_io_state(png_const_structrp png_ptr)
|
|
{
|
|
return png_ptr->io_state;
|
|
}
|
|
|
|
png_uint_32 PNGAPI
|
|
png_get_io_chunk_type(png_const_structrp png_ptr)
|
|
{
|
|
return png_ptr->chunk_name;
|
|
}
|
|
#endif /* IO_STATE */
|
|
|
|
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
|
|
# ifdef PNG_GET_PALETTE_MAX_SUPPORTED
|
|
int PNGAPI
|
|
png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
|
|
{
|
|
if (png_ptr != NULL && info_ptr != NULL)
|
|
return png_ptr->num_palette_max;
|
|
|
|
return -1;
|
|
}
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* READ || WRITE */
|