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pngget.c
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/* pngget.c - retrieval of values from info struct
*
* Copyright (c) 2018-2024 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
*/
#include "pngpriv.h"
#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
png_uint_32 PNGAPI
png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
png_uint_32 flag)
{
if (png_ptr != NULL && info_ptr != NULL)
{
#ifdef PNG_READ_tRNS_SUPPORTED
/* png_handle_PLTE() may have canceled a valid tRNS chunk but left the
* 'valid' flag for the detection of duplicate chunks. Do not report a
* valid tRNS chunk in this case.
*/
if (flag == PNG_INFO_tRNS && png_ptr->num_trans == 0)
return 0;
#endif
return info_ptr->valid & flag;
}
return 0;
}
size_t PNGAPI
png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->rowbytes;
return 0;
}
#ifdef PNG_INFO_IMAGE_SUPPORTED
png_bytepp PNGAPI
png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->row_pointers;
return 0;
}
#endif
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* Easy access to info, added in libpng-0.99 */
png_uint_32 PNGAPI
png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->width;
return 0;
}
png_uint_32 PNGAPI
png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->height;
return 0;
}
png_byte PNGAPI
png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->bit_depth;
return 0;
}
png_byte PNGAPI
png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->color_type;
return 0;
}
png_byte PNGAPI
png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->filter_type;
return 0;
}
png_byte PNGAPI
png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->interlace_type;
return 0;
}
png_byte PNGAPI
png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->compression_type;
return 0;
}
png_uint_32 PNGAPI
png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
info_ptr)
{
#ifdef PNG_pHYs_SUPPORTED
png_debug(1, "in png_get_x_pixels_per_meter");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_pHYs) != 0)
{
if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
return info_ptr->x_pixels_per_unit;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
png_uint_32 PNGAPI
png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
info_ptr)
{
#ifdef PNG_pHYs_SUPPORTED
png_debug(1, "in png_get_y_pixels_per_meter");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_pHYs) != 0)
{
if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
return info_ptr->y_pixels_per_unit;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
png_uint_32 PNGAPI
png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
#ifdef PNG_pHYs_SUPPORTED
png_debug(1, "in png_get_pixels_per_meter");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_pHYs) != 0)
{
if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
return info_ptr->x_pixels_per_unit;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
#ifdef PNG_FLOATING_POINT_SUPPORTED
float PNGAPI
png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
info_ptr)
{
#ifdef PNG_READ_pHYs_SUPPORTED
png_debug(1, "in png_get_pixel_aspect_ratio");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_pHYs) != 0)
{
if (info_ptr->x_pixels_per_unit != 0)
return (float)info_ptr->y_pixels_per_unit
/ (float)info_ptr->x_pixels_per_unit;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return (float)0.0;
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_fixed_point PNGAPI
png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
png_const_inforp info_ptr)
{
#ifdef PNG_READ_pHYs_SUPPORTED
png_debug(1, "in png_get_pixel_aspect_ratio_fixed");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_pHYs) != 0 &&
info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&
info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&
info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
{
png_fixed_point res;
/* The following casts work because a PNG 4 byte integer only has a valid
* range of 0..2^31-1; otherwise the cast might overflow.
*/
if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
(png_int_32)info_ptr->x_pixels_per_unit) != 0)
return res;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
#endif
png_int_32 PNGAPI
png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
#ifdef PNG_oFFs_SUPPORTED
png_debug(1, "in png_get_x_offset_microns");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_oFFs) != 0)
{
if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
return info_ptr->x_offset;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
png_int_32 PNGAPI
png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
#ifdef PNG_oFFs_SUPPORTED
png_debug(1, "in png_get_y_offset_microns");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_oFFs) != 0)
{
if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
return info_ptr->y_offset;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
png_int_32 PNGAPI
png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
#ifdef PNG_oFFs_SUPPORTED
png_debug(1, "in png_get_x_offset_pixels");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_oFFs) != 0)
{
if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
return info_ptr->x_offset;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
png_int_32 PNGAPI
png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
#ifdef PNG_oFFs_SUPPORTED
png_debug(1, "in png_get_y_offset_pixels");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_oFFs) != 0)
{
if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
return info_ptr->y_offset;
}
#else
PNG_UNUSED(png_ptr)
PNG_UNUSED(info_ptr)
#endif
return 0;
}
#ifdef PNG_INCH_CONVERSIONS_SUPPORTED
static png_uint_32
ppi_from_ppm(png_uint_32 ppm)
{
#if 0
/* The conversion is *(2.54/100), in binary (32 digits):
* .00000110100000001001110101001001
*/
png_uint_32 t1001, t1101;
ppm >>= 1; /* .1 */
t1001 = ppm + (ppm >> 3); /* .1001 */
t1101 = t1001 + (ppm >> 1); /* .1101 */
ppm >>= 20; /* .000000000000000000001 */
t1101 += t1101 >> 15; /* .1101000000000001101 */
t1001 >>= 11; /* .000000000001001 */
t1001 += t1001 >> 12; /* .000000000001001000000001001 */
ppm += t1001; /* .000000000001001000001001001 */
ppm += t1101; /* .110100000001001110101001001 */
return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
#else
/* The argument is a PNG unsigned integer, so it is not permitted
* to be bigger than 2^31.
*/
png_fixed_point result;
if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
5000) != 0)
return (png_uint_32)result;
/* Overflow. */
return 0;
#endif
}
png_uint_32 PNGAPI
png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
}
png_uint_32 PNGAPI
png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
}
png_uint_32 PNGAPI
png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
}
#ifdef PNG_FIXED_POINT_SUPPORTED
static png_fixed_point
png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
{
/* Convert from meters * 1,000,000 to inches * 100,000, meters to
* inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
* Notice that this can overflow - a warning is output and 0 is
* returned.
*/
return png_muldiv_warn(png_ptr, microns, 500, 127);
}
png_fixed_point PNGAPI
png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
png_const_inforp info_ptr)
{
return png_fixed_inches_from_microns(png_ptr,
png_get_x_offset_microns(png_ptr, info_ptr));
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_fixed_point PNGAPI
png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
png_const_inforp info_ptr)
{
return png_fixed_inches_from_microns(png_ptr,
png_get_y_offset_microns(png_ptr, info_ptr));
}
#endif
#ifdef PNG_FLOATING_POINT_SUPPORTED
float PNGAPI
png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
/* To avoid the overflow do the conversion directly in floating
* point.
*/
return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
}
#endif
#ifdef PNG_FLOATING_POINT_SUPPORTED
float PNGAPI
png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
/* To avoid the overflow do the conversion directly in floating
* point.
*/
return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
}
#endif
#ifdef PNG_pHYs_SUPPORTED
png_uint_32 PNGAPI
png_get_pHYs_dpi(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;
if (*unit_type == 1)
{
if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
}
}
}
return retval;
}
#endif /* pHYs */
#endif /* INCH_CONVERSIONS */
/* png_get_channels really belongs in here, too, but it's been around longer */
#endif /* EASY_ACCESS */
png_byte PNGAPI
png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->channels;
return 0;
}
#ifdef PNG_READ_SUPPORTED
png_const_bytep PNGAPI
png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->signature;
return NULL;
}
#endif
#ifdef PNG_bKGD_SUPPORTED
png_uint_32 PNGAPI
png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
png_color_16p *background)
{
png_debug1(1, "in %s retrieval function", "bKGD");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->valid & PNG_INFO_bKGD) != 0 &&
background != NULL)
{
*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 *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 retrieval function", "cHRM");
/* Quiet API change: this code used to only return the end points if a cHRM
* chunk was present, but the end points can also come from iCCP or sRGB
* chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
* the png_set_ APIs merely check that set end points are mutually
* consistent.
*/
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
{
if (white_x != NULL)
*white_x = png_float(png_ptr,
info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
if (white_y != NULL)
*white_y = png_float(png_ptr,
info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
if (red_x != NULL)
*red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
"cHRM red X");
if (red_y != NULL)
*red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
"cHRM red Y");
if (green_x != NULL)
*green_x = png_float(png_ptr,
info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
if (green_y != NULL)
*green_y = png_float(png_ptr,
info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
if (blue_x != NULL)
*blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
"cHRM blue X");
if (blue_y != NULL)
*blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
"cHRM blue Y");
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_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
{
if (red_X != NULL)
*red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
"cHRM red X");
if (red_Y != NULL)
*red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
"cHRM red Y");
if (red_Z != NULL)
*red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
"cHRM red Z");
if (green_X != NULL)
*green_X = png_float(png_ptr,
info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
if (green_Y != NULL)
*green_Y = png_float(png_ptr,
info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
if (green_Z != NULL)
*green_Z = png_float(png_ptr,
info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
if (blue_X != NULL)
*blue_X = png_float(png_ptr,
info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
if (blue_Y != NULL)
*blue_Y = png_float(png_ptr,
info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
if (blue_Z != NULL)
*blue_Z = png_float(png_ptr,
info_ptr->colorspace.end_points_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_debug1(1, "in %s retrieval function", "cHRM_XYZ");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
{
if (int_red_X != NULL)
*int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
if (int_red_Y != NULL)
*int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
if (int_red_Z != NULL)
*int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
if (int_green_X != NULL)
*int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
if (int_green_Y != NULL)
*int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
if (int_green_Z != NULL)
*int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
if (int_blue_X != NULL)
*int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
if (int_blue_Y != NULL)
*int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
if (int_blue_Z != NULL)
*int_blue_Z = info_ptr->colorspace.end_points_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 *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_debug1(1, "in %s retrieval function", "cHRM");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
{
if (white_x != NULL)
*white_x = info_ptr->colorspace.end_points_xy.whitex;
if (white_y != NULL)
*white_y = info_ptr->colorspace.end_points_xy.whitey;
if (red_x != NULL)
*red_x = info_ptr->colorspace.end_points_xy.redx;
if (red_y != NULL)
*red_y = info_ptr->colorspace.end_points_xy.redy;
if (green_x != NULL)
*green_x = info_ptr->colorspace.end_points_xy.greenx;
if (green_y != NULL)
*green_y = info_ptr->colorspace.end_points_xy.greeny;
if (blue_x != NULL)
*blue_x = info_ptr->colorspace.end_points_xy.bluex;
if (blue_y != NULL)
*blue_y = info_ptr->colorspace.end_points_xy.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");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
file_gamma != NULL)
{
*file_gamma = info_ptr->colorspace.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)");
if (png_ptr != NULL && info_ptr != NULL &&
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
file_gamma != NULL)
{
*file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
"png_get_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 && file_srgb_intent != NULL)
{
*file_srgb_intent = info_ptr->colorspace.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_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_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)