| |
| /* pngget.c - retrieval of values from info struct |
| * |
| * Last changed in libpng 1.4.6 [April 8, 2011] |
| * Copyright (c) 1998-2002,2004,2006-2011 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 |
| * |
| */ |
| |
| #define PNG_NO_PEDANTIC_WARNINGS |
| #include "png.h" |
| #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
| #include "pngpriv.h" |
| |
| 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); |
| |
| else |
| 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); |
| |
| else |
| 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); |
| |
| else |
| 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) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| #ifdef PNG_pHYs_SUPPORTED |
| if (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 (0); |
| |
| else |
| return (info_ptr->x_pixels_per_unit); |
| } |
| #else |
| return (0); |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 PNGAPI |
| png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| #ifdef PNG_pHYs_SUPPORTED |
| if (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 (0); |
| |
| else |
| return (info_ptr->y_pixels_per_unit); |
| } |
| #else |
| return (0); |
| #endif |
| return (0); |
| } |
| |
| png_uint_32 PNGAPI |
| png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| #ifdef PNG_pHYs_SUPPORTED |
| if (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 (0); |
| |
| else |
| return (info_ptr->x_pixels_per_unit); |
| } |
| #else |
| return (0); |
| #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) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| #ifdef PNG_pHYs_SUPPORTED |
| |
| if (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)0.0); |
| |
| else |
| return ((float)((float)info_ptr->y_pixels_per_unit |
| /(float)info_ptr->x_pixels_per_unit)); |
| } |
| #else |
| return (0.0); |
| #endif |
| return ((float)0.0); |
| } |
| #endif |
| |
| png_int_32 PNGAPI |
| png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| #ifdef PNG_oFFs_SUPPORTED |
| |
| if (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 (0); |
| |
| else |
| return (info_ptr->x_offset); |
| } |
| #else |
| return (0); |
| #endif |
| return (0); |
| } |
| |
| png_int_32 PNGAPI |
| png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| if (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 (0); |
| |
| else |
| return (info_ptr->y_offset); |
| } |
| #else |
| return (0); |
| #endif |
| return (0); |
| } |
| |
| png_int_32 PNGAPI |
| png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| if (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_PIXEL) |
| return (0); |
| |
| else |
| return (info_ptr->x_offset); |
| } |
| #else |
| return (0); |
| #endif |
| return (0); |
| } |
| |
| png_int_32 PNGAPI |
| png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| if (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_PIXEL) |
| return (0); |
| |
| else |
| return (info_ptr->y_offset); |
| } |
| #else |
| return (0); |
| #endif |
| return (0); |
| } |
| |
| #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) |
| png_uint_32 PNGAPI |
| png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr) |
| *.0254 +.5)); |
| } |
| |
| png_uint_32 PNGAPI |
| png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr) |
| *.0254 +.5)); |
| } |
| |
| png_uint_32 PNGAPI |
| png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr) |
| *.0254 +.5)); |
| } |
| |
| float PNGAPI |
| png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| return ((float)png_get_x_offset_microns(png_ptr, info_ptr) |
| *.00003937); |
| } |
| |
| float PNGAPI |
| png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| return ((float)png_get_y_offset_microns(png_ptr, info_ptr) |
| *.00003937); |
| } |
| |
| #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 && PNG_FLOATING_POINT_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); |
| else |
| return (0); |
| } |
| |
| png_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); |
| else |
| 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 |
| #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 = (double)info_ptr->x_white; |
| if (white_y != NULL) |
| *white_y = (double)info_ptr->y_white; |
| if (red_x != NULL) |
| *red_x = (double)info_ptr->x_red; |
| if (red_y != NULL) |
| *red_y = (double)info_ptr->y_red; |
| if (green_x != NULL) |
| *green_x = (double)info_ptr->x_green; |
| if (green_y != NULL) |
| *green_y = (double)info_ptr->y_green; |
| if (blue_x != NULL) |
| *blue_x = (double)info_ptr->x_blue; |
| if (blue_y != NULL) |
| *blue_y = (double)info_ptr->y_blue; |
| return (PNG_INFO_cHRM); |
| } |
| return (0); |
| } |
| #endif |
| #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->int_x_white; |
| if (white_y != NULL) |
| *white_y = info_ptr->int_y_white; |
| if (red_x != NULL) |
| *red_x = info_ptr->int_x_red; |
| if (red_y != NULL) |
| *red_y = info_ptr->int_y_red; |
| if (green_x != NULL) |
| *green_x = info_ptr->int_x_green; |
| if (green_y != NULL) |
| *green_y = info_ptr->int_y_green; |
| if (blue_x != NULL) |
| *blue_x = info_ptr->int_x_blue; |
| if (blue_y != NULL) |
| *blue_y = info_ptr->int_y_blue; |
| return (PNG_INFO_cHRM); |
| } |
| return (0); |
| } |
| #endif |
| #endif |
| |
| #ifdef PNG_gAMA_SUPPORTED |
| #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_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 = (double)info_ptr->gamma; |
| return (PNG_INFO_gAMA); |
| } |
| return (0); |
| } |
| #endif |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| png_uint_32 PNGAPI |
| png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr, |
| png_fixed_point *int_file_gamma) |
| { |
| png_debug1(1, "in %s retrieval function", "gAMA"); |
| |
| if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
| && int_file_gamma != NULL) |
| { |
| *int_file_gamma = info_ptr->int_gamma; |
| return (PNG_INFO_gAMA); |
| } |
| return (0); |
| } |
| #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_charpp 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_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 = info_ptr->scal_pixel_width; |
| *height = info_ptr->scal_pixel_height; |
| return (PNG_INFO_sCAL); |
| } |
| return(0); |
| } |
| #else |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| 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 |
| #endif |
| #endif |
| |
| #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 |
| |
| 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 %s retrieval function", |
| (png_ptr->chunk_name[0] == '\0' ? "text" |
| : (png_const_charp)png_ptr->chunk_name)); |
| |
| if (text_ptr != NULL) |
| *text_ptr = info_ptr->text; |
| |
| if (num_text != NULL) |
| *num_text = info_ptr->num_text; |
| |
| return ((png_uint_32)info_ptr->num_text); |
| } |
| 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 |
| png_uint_32 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 ((png_uint_32)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 : 0L); |
| } |
| |
| |
| #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_const_structp png_ptr) |
| { |
| return png_ptr->io_state; |
| } |
| |
| png_bytep PNGAPI |
| png_get_io_chunk_name(png_structp png_ptr) |
| { |
| return png_ptr->chunk_name; |
| } |
| #endif /* ?PNG_IO_STATE_SUPPORTED */ |
| |
| #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |