| |
| /* pngget.c - retrieval of values from info struct |
| * |
| * Last changed in libpng 1.6.32 [August 24, 2017] |
| * Copyright (c) 1998-2002,2004,2006-2017 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) != 0) |
| { |
| 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); |
| } |
| #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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_pHYs) != 0) |
| { |
| 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); |
| } |
| #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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_pHYs) != 0) |
| { |
| 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); |
| } |
| #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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_pHYs) != 0) |
| { |
| 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) != 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; |
| |
| 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) != 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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_oFFs) != 0) |
| { |
| 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); |
| } |
| #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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_oFFs) != 0) |
| { |
| 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); |
| } |
| #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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_oFFs) != 0) |
| { |
| 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); |
| } |
| #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 |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_oFFs) != 0) |
| { |
| 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); |
| } |
| #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 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) != 0) |
| { |
| 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 /* 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) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_bKGD) != 0 && |
| 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) != 0) |
| { |
| 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) != 0) |
| { |
| 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) != 0) |
| { |
| 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) != 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 && 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_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) |
| { |
| 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) |
| { |
| 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) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_sCAL) != 0) |
| { |
| *unit = info_ptr->scal_unit; |
| *width = info_ptr->scal_s_width; |
| *height = info_ptr->scal_s_height; |
| return (PNG_INFO_sCAL); |
| } |
| |
| return(0); |
| } |
| #endif /* sCAL */ |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| png_uint_32 PNGAPI |
| png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr, |
| png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
| { |
| png_uint_32 retval = 0; |
| |
| png_debug1(1, "in %s retrieval function", "pHYs"); |
| |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_pHYs) != 0) |
| { |
| if (res_x != NULL) |
| { |
| *res_x = info_ptr->x_pixels_per_unit; |
| retval |= PNG_INFO_pHYs; |
| } |
| |
| if (res_y != NULL) |
| { |
| *res_y = info_ptr->y_pixels_per_unit; |
| retval |= PNG_INFO_pHYs; |
| } |
| |
| if (unit_type != NULL) |
| { |
| *unit_type = (int)info_ptr->phys_unit_type; |
| retval |= PNG_INFO_pHYs; |
| } |
| } |
| |
| return (retval); |
| } |
| #endif /* pHYs */ |
| |
| png_uint_32 PNGAPI |
| png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_colorp *palette, int *num_palette) |
| { |
| png_debug1(1, "in %s retrieval function", "PLTE"); |
| |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL) |
| { |
| *palette = info_ptr->palette; |
| *num_palette = info_ptr->num_palette; |
| png_debug1(3, "num_palette = %d", *num_palette); |
| return (PNG_INFO_PLTE); |
| } |
| |
| return (0); |
| } |
| |
| #ifdef PNG_sBIT_SUPPORTED |
| png_uint_32 PNGAPI |
| png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_color_8p *sig_bit) |
| { |
| png_debug1(1, "in %s retrieval function", "sBIT"); |
| |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL) |
| { |
| *sig_bit = &(info_ptr->sig_bit); |
| return (PNG_INFO_sBIT); |
| } |
| |
| return (0); |
| } |
| #endif |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| int PNGAPI |
| png_get_text(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_textp *text_ptr, int *num_text) |
| { |
| if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) |
| { |
| png_debug1(1, "in 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) != 0 && mod_time != NULL) |
| { |
| *mod_time = &(info_ptr->mod_time); |
| return (PNG_INFO_tIME); |
| } |
| |
| return (0); |
| } |
| #endif |
| |
| #ifdef PNG_tRNS_SUPPORTED |
| png_uint_32 PNGAPI |
| png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr, |
| png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color) |
| { |
| png_uint_32 retval = 0; |
| if (png_ptr != NULL && info_ptr != NULL && |
| (info_ptr->valid & PNG_INFO_tRNS) != 0) |
| { |
| 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) != 0) |
| #endif |
| { |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| return png_ptr->IDAT_read_size; |
| #else |
| return PNG_IDAT_READ_SIZE; |
| #endif |
| } |
| |
| #ifdef PNG_WRITE_SUPPORTED |
| else |
| return png_ptr->zbuffer_size; |
| #endif |
| } |
| |
| #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| /* These functions were added to libpng 1.2.6 and were enabled |
| * by default in libpng-1.4.0 */ |
| png_uint_32 PNGAPI |
| png_get_user_width_max (png_const_structrp png_ptr) |
| { |
| return (png_ptr ? png_ptr->user_width_max : 0); |
| } |
| |
| png_uint_32 PNGAPI |
| png_get_user_height_max (png_const_structrp png_ptr) |
| { |
| return (png_ptr ? png_ptr->user_height_max : 0); |
| } |
| |
| /* This function was added to libpng 1.4.0 */ |
| png_uint_32 PNGAPI |
| png_get_chunk_cache_max (png_const_structrp png_ptr) |
| { |
| return (png_ptr ? png_ptr->user_chunk_cache_max : 0); |
| } |
| |
| /* This function was added to libpng 1.4.1 */ |
| png_alloc_size_t PNGAPI |
| png_get_chunk_malloc_max (png_const_structrp png_ptr) |
| { |
| return (png_ptr ? png_ptr->user_chunk_malloc_max : 0); |
| } |
| #endif /* SET_USER_LIMITS */ |
| |
| /* These functions were added to libpng 1.4.0 */ |
| #ifdef PNG_IO_STATE_SUPPORTED |
| png_uint_32 PNGAPI |
| png_get_io_state (png_const_structrp png_ptr) |
| { |
| return png_ptr->io_state; |
| } |
| |
| png_uint_32 PNGAPI |
| png_get_io_chunk_type (png_const_structrp png_ptr) |
| { |
| return png_ptr->chunk_name; |
| } |
| #endif /* IO_STATE */ |
| |
| #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
| # ifdef PNG_GET_PALETTE_MAX_SUPPORTED |
| int PNGAPI |
| png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr) |
| { |
| if (png_ptr != NULL && info_ptr != NULL) |
| return png_ptr->num_palette_max; |
| |
| return (-1); |
| } |
| # endif |
| #endif |
| |
| #endif /* READ || WRITE */ |
