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libpng/pngget.c
Glenn Randers-Pehrson d58251b47e [libpng15] Reverted previous change; removed png_get_compression_buffer() API. 
It is too risky. Exactly how png_ptr->zbuf is used is under control of the
individual chunk implementation and there could easily be significant changes
within a major release.
2011-10-13 20:30:02 -05:00

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/* pngget.c - retrieval of values from info struct
*
* Last changed in libpng 1.5.6 [(PENDING RELEASE)]
* Copyright (c) 1998-2011 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return info_ptr->height;
return (0);
}
png_byte PNGAPI
png_get_bit_depth(png_const_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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));
}
#endif
return ((float)0.0);
}
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
png_fixed_point PNGAPI
png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr,
png_const_infop 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;
}
#endif
return 0;
}
#endif
png_int_32 PNGAPI
png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp 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_structp png_ptr,
png_const_infop 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_structp png_ptr,
png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop info_ptr,
png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
{
png_uint_32 retval = 0;
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
png_debug1(1, "in %s retrieval function", "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_structp png_ptr, png_const_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return(info_ptr->channels);
return (0);
}
png_const_bytep PNGAPI
png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return(info_ptr->signature);
return (NULL);
}
#ifdef PNG_bKGD_SUPPORTED
png_uint_32 PNGAPI
png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr,
png_color_16p *background)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
&& background != NULL)
{
png_debug1(1, "in %s retrieval function", "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
*/
png_uint_32 PNGFAPI
png_get_cHRM_XYZ_fixed(png_structp png_ptr, png_const_infop 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->valid & PNG_INFO_cHRM))
{
png_xy xy;
png_XYZ XYZ;
png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
xy.whitex = info_ptr->x_white;
xy.whitey = info_ptr->y_white;
xy.redx = info_ptr->x_red;
xy.redy = info_ptr->y_red;
xy.greenx = info_ptr->x_green;
xy.greeny = info_ptr->y_green;
xy.bluex = info_ptr->x_blue;
xy.bluey = info_ptr->y_blue;
/* The *_checked function handles error reporting, so just return 0 if
* there is a failure here.
*/
if (png_XYZ_from_xy_checked(png_ptr, &XYZ, xy))
{
if (int_red_X != NULL)
*int_red_X = XYZ.redX;
if (int_red_Y != NULL)
*int_red_Y = XYZ.redY;
if (int_red_Z != NULL)
*int_red_Z = XYZ.redZ;
if (int_green_X != NULL)
*int_green_X = XYZ.greenX;
if (int_green_Y != NULL)
*int_green_Y = XYZ.greenY;
if (int_green_Z != NULL)
*int_green_Z = XYZ.greenZ;
if (int_blue_X != NULL)
*int_blue_X = XYZ.blueX;
if (int_blue_Y != NULL)
*int_blue_Y = XYZ.blueY;
if (int_blue_Z != NULL)
*int_blue_Z = XYZ.blueZ;
return (PNG_INFO_cHRM);
}
}
return (0);
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
png_uint_32 PNGAPI
png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr,
double *white_x, double *white_y, double *red_x, double *red_y,
double *green_x, double *green_y, double *blue_x, double *blue_y)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
{
png_debug1(1, "in %s retrieval function", "cHRM");
if (white_x != NULL)
*white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X");
if (white_y != NULL)
*white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y");
if (red_x != NULL)
*red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X");
if (red_y != NULL)
*red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y");
if (green_x != NULL)
*green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X");
if (green_y != NULL)
*green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y");
if (blue_x != NULL)
*blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X");
if (blue_y != NULL)
*blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y");
return (PNG_INFO_cHRM);
}
return (0);
}
png_uint_32 PNGAPI
png_get_cHRM_XYZ(png_structp png_ptr, png_const_infop 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;
if (png_get_cHRM_XYZ_fixed(png_ptr, info_ptr,
&XYZ.redX, &XYZ.redY, &XYZ.redZ, &XYZ.greenX, &XYZ.greenY, &XYZ.greenZ,
&XYZ.blueX, &XYZ.blueY, &XYZ.blueZ) & PNG_INFO_cHRM)
{
if (red_X != NULL)
*red_X = png_float(png_ptr, XYZ.redX, "cHRM red X");
if (red_Y != NULL)
*red_Y = png_float(png_ptr, XYZ.redY, "cHRM red Y");
if (red_Z != NULL)
*red_Z = png_float(png_ptr, XYZ.redZ, "cHRM red Z");
if (green_X != NULL)
*green_X = png_float(png_ptr, XYZ.greenX, "cHRM green X");
if (green_Y != NULL)
*green_Y = png_float(png_ptr, XYZ.greenY, "cHRM green Y");
if (green_Z != NULL)
*green_Z = png_float(png_ptr, XYZ.greenZ, "cHRM green Z");
if (blue_X != NULL)
*blue_X = png_float(png_ptr, XYZ.blueX, "cHRM blue X");
if (blue_Y != NULL)
*blue_Y = png_float(png_ptr, XYZ.blueY, "cHRM blue Y");
if (blue_Z != NULL)
*blue_Z = png_float(png_ptr, XYZ.blueZ, "cHRM blue Z");
return (PNG_INFO_cHRM);
}
return (0);
}
# endif
# ifdef PNG_FIXED_POINT_SUPPORTED
png_uint_32 PNGAPI
png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop 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->valid & PNG_INFO_cHRM))
{
if (white_x != NULL)
*white_x = info_ptr->x_white;
if (white_y != NULL)
*white_y = info_ptr->y_white;
if (red_x != NULL)
*red_x = info_ptr->x_red;
if (red_y != NULL)
*red_y = info_ptr->y_red;
if (green_x != NULL)
*green_x = info_ptr->x_green;
if (green_y != NULL)
*green_y = info_ptr->y_green;
if (blue_x != NULL)
*blue_x = info_ptr->x_blue;
if (blue_y != NULL)
*blue_y = info_ptr->y_blue;
return (PNG_INFO_cHRM);
}
return (0);
}
# endif
#endif
#ifdef PNG_gAMA_SUPPORTED
png_uint_32 PNGFAPI
png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
png_fixed_point *file_gamma)
{
png_debug1(1, "in %s retrieval function", "gAMA");
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
&& file_gamma != NULL)
{
*file_gamma = info_ptr->gamma;
return (PNG_INFO_gAMA);
}
return (0);
}
# ifdef PNG_FLOATING_POINT_SUPPORTED
png_uint_32 PNGAPI
png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr,
double *file_gamma)
{
png_fixed_point igamma;
png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);
if (ok)
*file_gamma = png_float(png_ptr, igamma, "png_get_gAMA");
return ok;
}
# endif
#endif
#ifdef PNG_sRGB_SUPPORTED
png_uint_32 PNGAPI
png_get_sRGB(png_const_structp png_ptr, png_const_infop 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 = (int)info_ptr->srgb_intent;
return (PNG_INFO_sRGB);
}
return (0);
}
#endif
#ifdef PNG_iCCP_SUPPORTED
png_uint_32 PNGAPI
png_get_iCCP(png_const_structp png_ptr, png_const_infop 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 && profile != NULL && proflen != NULL)
{
*name = info_ptr->iccp_name;
*profile = info_ptr->iccp_profile;
/* Compression_type is a dummy so the API won't have to change
* if we introduce multiple compression types later.
*/
*proflen = (int)info_ptr->iccp_proflen;
*compression_type = (int)info_ptr->iccp_compression;
return (PNG_INFO_iCCP);
}
return (0);
}
#endif
#ifdef PNG_sPLT_SUPPORTED
png_uint_32 PNGAPI
png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr,
png_sPLT_tpp spalettes)
{
if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
{
*spalettes = info_ptr->splt_palettes;
return ((png_uint_32)info_ptr->splt_palettes_num);
}
return (0);
}
#endif
#ifdef PNG_hIST_SUPPORTED
png_uint_32 PNGAPI
png_get_hIST(png_const_structp png_ptr, png_const_infop 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_structp png_ptr, png_infop info_ptr,
png_uint_32 *width, png_uint_32 *height, int *bit_depth,
int *color_type, int *interlace_type, int *compression_type,
int *filter_type)
{
png_debug1(1, "in %s 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop info_ptr,
png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
png_charp *units, png_charpp *params)
{
png_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
# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
png_uint_32 PNGAPI
png_get_sCAL_fixed(png_structp png_ptr, png_const_infop 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 */
*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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_const_infop 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_structp png_ptr, png_infop 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
png_uint_32 PNGAPI
png_get_text(png_const_structp png_ptr, png_const_infop info_ptr,
png_textp *text_ptr, int *num_text)
{
if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
{
png_debug1(1, "in 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 ((png_uint_32)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_structp png_ptr, png_infop 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_structp png_ptr, png_infop 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_UNKNOWN_CHUNKS_SUPPORTED
int PNGAPI
png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop 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_structp 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_structp png_ptr)
{
return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
}
#endif
png_size_t PNGAPI
png_get_compression_buffer_size(png_const_structp png_ptr)
{
return (png_ptr ? png_ptr->zbuf_size : 0);
}
#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_structp png_ptr)
{
return (png_ptr ? png_ptr->user_width_max : 0);
}
png_uint_32 PNGAPI
png_get_user_height_max (png_const_structp 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_structp 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_structp 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_structp png_ptr)
{
return png_ptr->io_state;
}
png_uint_32 PNGAPI
png_get_io_chunk_type (png_const_structp png_ptr)
{
return png_ptr->chunk_name;
}
png_const_bytep PNGAPI
png_get_io_chunk_name (png_structp png_ptr)
{
PNG_CSTRING_FROM_CHUNK(png_ptr->io_chunk_string, png_ptr->chunk_name);
return png_ptr->io_chunk_string;
}
#endif /* ?PNG_IO_STATE_SUPPORTED */
#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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