/* pngget.c - retrieval of values from info struct | |
* | |
* Last changed in libpng 1.6.1 [March 28, 2013] | |
* Copyright (c) 1998-2013 Glenn Randers-Pehrson | |
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
* (Version 0.88 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) | |
return(info_ptr->valid & flag); | |
return(0); | |
} | |
png_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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) | |
{ | |
png_debug1(1, "in %s retrieval function", | |
"png_get_x_pixels_per_meter"); | |
if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) | |
return (info_ptr->x_pixels_per_unit); | |
} | |
#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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) | |
{ | |
png_debug1(1, "in %s retrieval function", | |
"png_get_y_pixels_per_meter"); | |
if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) | |
return (info_ptr->y_pixels_per_unit); | |
} | |
#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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "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 (info_ptr->x_pixels_per_unit); | |
} | |
#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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio"); | |
if (info_ptr->x_pixels_per_unit != 0) | |
return ((float)((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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs) | |
&& 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; | |
png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed"); | |
/* 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)) | |
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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); | |
if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) | |
return (info_ptr->x_offset); | |
} | |
#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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); | |
if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) | |
return (info_ptr->y_offset); | |
} | |
#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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels"); | |
if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) | |
return (info_ptr->x_offset); | |
} | |
#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 | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels"); | |
if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) | |
return (info_ptr->y_offset); | |
} | |
#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)) | |
return 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 metres * 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; | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) | |
{ | |
png_debug1(1, "in %s retrieval function", "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 * .0254 + .50); | |
if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50); | |
} | |
} | |
} | |
return (retval); | |
} | |
#endif /* PNG_pHYs_SUPPORTED */ | |
#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ | |
/* png_get_channels really belongs in here, too, but it's been around longer */ | |
#endif /* PNG_EASY_ACCESS_SUPPORTED */ | |
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) | |
{ | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) | |
&& background != NULL) | |
{ | |
png_debug1(1, "in %s retrieval function", "bKGD"); | |
*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) | |
{ | |
/* 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)) | |
{ | |
png_debug1(1, "in %s retrieval function", "cHRM"); | |
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) | |
{ | |
if (png_ptr != NULL && info_ptr != NULL && | |
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) | |
{ | |
png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)"); | |
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) | |
{ | |
if (png_ptr != NULL && info_ptr != NULL && | |
(info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) | |
{ | |
png_debug1(1, "in %s retrieval function", "cHRM_XYZ"); | |
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)) | |
{ | |
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) && | |
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) && | |
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) | |
&& 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) | |
&& name != NULL && compression_type != 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. | |
*/ | |
*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) | |
{ | |
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_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) | |
&& 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 || width == NULL || | |
height == NULL || bit_depth == NULL || color_type == NULL) | |
return (0); | |
*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; | |
/* 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) | |
&& 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) | |
&& 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) | |
{ | |
if (png_ptr != NULL && info_ptr != NULL && | |
(info_ptr->valid & PNG_INFO_sCAL)) | |
{ | |
*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) | |
{ | |
if (png_ptr != NULL && info_ptr != NULL && | |
(info_ptr->valid & PNG_INFO_sCAL)) | |
{ | |
*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) | |
{ | |
if (png_ptr != NULL && info_ptr != NULL && | |
(info_ptr->valid & PNG_INFO_sCAL)) | |
{ | |
*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)) | |
{ | |
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) | |
&& 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) | |
&& 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 0x%lx retrieval function", | |
(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) | |
&& 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; | |
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) | |
{ | |
png_debug1(1, "in %s retrieval function", "tRNS"); | |
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 | |
png_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) | |
# 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 /* ?PNG_SET_USER_LIMITS_SUPPORTED */ | |
/* 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 /* ?PNG_IO_STATE_SUPPORTED */ | |
#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 /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |