1 |
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2 | /* pngget.c - retrieval of values from info struct
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3 | *
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4 | * Copyright (c) 2018-2024 Cosmin Truta
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5 | * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
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6 | * Copyright (c) 1996-1997 Andreas Dilger
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7 | * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
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8 | *
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9 | * This code is released under the libpng license.
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10 | * For conditions of distribution and use, see the disclaimer
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11 | * and license in png.h
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12 | *
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13 | */
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14 |
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15 | #include "pngpriv.h"
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16 |
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17 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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18 |
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19 | png_uint_32 PNGAPI
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20 | png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr,
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21 | png_uint_32 flag)
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22 | {
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23 | if (png_ptr != NULL && info_ptr != NULL)
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24 | {
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25 | #ifdef PNG_READ_tRNS_SUPPORTED
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26 | /* png_handle_PLTE() may have canceled a valid tRNS chunk but left the
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27 | * 'valid' flag for the detection of duplicate chunks. Do not report a
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28 | * valid tRNS chunk in this case.
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29 | */
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30 | if (flag == PNG_INFO_tRNS && png_ptr->num_trans == 0)
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31 | return 0;
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32 | #endif
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33 |
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34 | return info_ptr->valid & flag;
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35 | }
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36 |
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37 | return 0;
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38 | }
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39 |
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40 | size_t PNGAPI
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41 | png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
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42 | {
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43 | if (png_ptr != NULL && info_ptr != NULL)
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44 | return info_ptr->rowbytes;
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45 |
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46 | return 0;
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47 | }
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48 |
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49 | #ifdef PNG_INFO_IMAGE_SUPPORTED
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50 | png_bytepp PNGAPI
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51 | png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
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52 | {
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53 | if (png_ptr != NULL && info_ptr != NULL)
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54 | return info_ptr->row_pointers;
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55 |
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56 | return 0;
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57 | }
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58 | #endif
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59 |
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60 | #ifdef PNG_EASY_ACCESS_SUPPORTED
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61 | /* Easy access to info, added in libpng-0.99 */
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62 | png_uint_32 PNGAPI
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63 | png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
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64 | {
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65 | if (png_ptr != NULL && info_ptr != NULL)
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66 | return info_ptr->width;
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67 |
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68 | return 0;
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69 | }
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70 |
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71 | png_uint_32 PNGAPI
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72 | png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
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73 | {
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74 | if (png_ptr != NULL && info_ptr != NULL)
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75 | return info_ptr->height;
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76 |
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77 | return 0;
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78 | }
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79 |
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80 | png_byte PNGAPI
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81 | png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
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82 | {
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83 | if (png_ptr != NULL && info_ptr != NULL)
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84 | return info_ptr->bit_depth;
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85 |
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86 | return 0;
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87 | }
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88 |
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89 | png_byte PNGAPI
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90 | png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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91 | {
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92 | if (png_ptr != NULL && info_ptr != NULL)
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93 | return info_ptr->color_type;
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94 |
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95 | return 0;
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96 | }
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97 |
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98 | png_byte PNGAPI
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99 | png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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100 | {
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101 | if (png_ptr != NULL && info_ptr != NULL)
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102 | return info_ptr->filter_type;
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103 |
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104 | return 0;
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105 | }
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106 |
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107 | png_byte PNGAPI
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108 | png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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109 | {
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110 | if (png_ptr != NULL && info_ptr != NULL)
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111 | return info_ptr->interlace_type;
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112 |
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113 | return 0;
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114 | }
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115 |
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116 | png_byte PNGAPI
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117 | png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
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118 | {
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119 | if (png_ptr != NULL && info_ptr != NULL)
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120 | return info_ptr->compression_type;
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121 |
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122 | return 0;
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123 | }
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124 |
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125 | png_uint_32 PNGAPI
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126 | png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
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127 | info_ptr)
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128 | {
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129 | #ifdef PNG_pHYs_SUPPORTED
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130 | png_debug(1, "in png_get_x_pixels_per_meter");
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131 |
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132 | if (png_ptr != NULL && info_ptr != NULL &&
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133 | (info_ptr->valid & PNG_INFO_pHYs) != 0)
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134 | {
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135 | if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
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136 | return info_ptr->x_pixels_per_unit;
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137 | }
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138 | #else
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139 | PNG_UNUSED(png_ptr)
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140 | PNG_UNUSED(info_ptr)
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141 | #endif
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142 |
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143 | return 0;
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144 | }
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145 |
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146 | png_uint_32 PNGAPI
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147 | png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
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148 | info_ptr)
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149 | {
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150 | #ifdef PNG_pHYs_SUPPORTED
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151 | png_debug(1, "in png_get_y_pixels_per_meter");
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152 |
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153 | if (png_ptr != NULL && info_ptr != NULL &&
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154 | (info_ptr->valid & PNG_INFO_pHYs) != 0)
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155 | {
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156 | if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
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157 | return info_ptr->y_pixels_per_unit;
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158 | }
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159 | #else
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160 | PNG_UNUSED(png_ptr)
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161 | PNG_UNUSED(info_ptr)
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162 | #endif
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163 |
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164 | return 0;
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165 | }
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166 |
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167 | png_uint_32 PNGAPI
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168 | png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
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169 | {
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170 | #ifdef PNG_pHYs_SUPPORTED
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171 | png_debug(1, "in png_get_pixels_per_meter");
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172 |
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173 | if (png_ptr != NULL && info_ptr != NULL &&
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174 | (info_ptr->valid & PNG_INFO_pHYs) != 0)
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175 | {
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176 | if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
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177 | info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
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178 | return info_ptr->x_pixels_per_unit;
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179 | }
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180 | #else
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181 | PNG_UNUSED(png_ptr)
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182 | PNG_UNUSED(info_ptr)
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183 | #endif
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184 |
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185 | return 0;
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186 | }
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187 |
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188 | #ifdef PNG_FLOATING_POINT_SUPPORTED
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189 | float PNGAPI
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190 | png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
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191 | info_ptr)
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192 | {
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193 | #ifdef PNG_READ_pHYs_SUPPORTED
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194 | png_debug(1, "in png_get_pixel_aspect_ratio");
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195 |
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196 | if (png_ptr != NULL && info_ptr != NULL &&
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197 | (info_ptr->valid & PNG_INFO_pHYs) != 0)
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198 | {
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199 | if (info_ptr->x_pixels_per_unit != 0)
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200 | return (float)info_ptr->y_pixels_per_unit
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201 | / (float)info_ptr->x_pixels_per_unit;
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202 | }
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203 | #else
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204 | PNG_UNUSED(png_ptr)
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205 | PNG_UNUSED(info_ptr)
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206 | #endif
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207 |
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208 | return (float)0.0;
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209 | }
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210 | #endif
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211 |
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212 | #ifdef PNG_FIXED_POINT_SUPPORTED
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213 | png_fixed_point PNGAPI
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214 | png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
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215 | png_const_inforp info_ptr)
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216 | {
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217 | #ifdef PNG_READ_pHYs_SUPPORTED
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218 | png_debug(1, "in png_get_pixel_aspect_ratio_fixed");
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219 |
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220 | if (png_ptr != NULL && info_ptr != NULL &&
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221 | (info_ptr->valid & PNG_INFO_pHYs) != 0 &&
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222 | info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&
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223 | info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&
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224 | info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
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225 | {
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226 | png_fixed_point res;
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227 |
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228 | /* The following casts work because a PNG 4 byte integer only has a valid
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229 | * range of 0..2^31-1; otherwise the cast might overflow.
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230 | */
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231 | if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
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232 | (png_int_32)info_ptr->x_pixels_per_unit) != 0)
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233 | return res;
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234 | }
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235 | #else
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236 | PNG_UNUSED(png_ptr)
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237 | PNG_UNUSED(info_ptr)
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238 | #endif
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239 |
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240 | return 0;
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241 | }
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242 | #endif
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243 |
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244 | png_int_32 PNGAPI
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245 | png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
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246 | {
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247 | #ifdef PNG_oFFs_SUPPORTED
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248 | png_debug(1, "in png_get_x_offset_microns");
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249 |
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250 | if (png_ptr != NULL && info_ptr != NULL &&
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251 | (info_ptr->valid & PNG_INFO_oFFs) != 0)
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252 | {
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253 | if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
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254 | return info_ptr->x_offset;
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255 | }
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256 | #else
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257 | PNG_UNUSED(png_ptr)
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258 | PNG_UNUSED(info_ptr)
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259 | #endif
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260 |
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261 | return 0;
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262 | }
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263 |
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264 | png_int_32 PNGAPI
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265 | png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
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266 | {
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267 | #ifdef PNG_oFFs_SUPPORTED
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268 | png_debug(1, "in png_get_y_offset_microns");
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269 |
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270 | if (png_ptr != NULL && info_ptr != NULL &&
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271 | (info_ptr->valid & PNG_INFO_oFFs) != 0)
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272 | {
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273 | if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
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274 | return info_ptr->y_offset;
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275 | }
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276 | #else
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277 | PNG_UNUSED(png_ptr)
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278 | PNG_UNUSED(info_ptr)
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279 | #endif
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280 |
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281 | return 0;
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282 | }
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283 |
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284 | png_int_32 PNGAPI
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285 | png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
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286 | {
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287 | #ifdef PNG_oFFs_SUPPORTED
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288 | png_debug(1, "in png_get_x_offset_pixels");
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289 |
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290 | if (png_ptr != NULL && info_ptr != NULL &&
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291 | (info_ptr->valid & PNG_INFO_oFFs) != 0)
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292 | {
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293 | if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
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294 | return info_ptr->x_offset;
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295 | }
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296 | #else
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297 | PNG_UNUSED(png_ptr)
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298 | PNG_UNUSED(info_ptr)
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299 | #endif
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300 |
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301 | return 0;
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302 | }
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303 |
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304 | png_int_32 PNGAPI
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305 | png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
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306 | {
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307 | #ifdef PNG_oFFs_SUPPORTED
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308 | png_debug(1, "in png_get_y_offset_pixels");
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309 |
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310 | if (png_ptr != NULL && info_ptr != NULL &&
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311 | (info_ptr->valid & PNG_INFO_oFFs) != 0)
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312 | {
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313 | if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
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314 | return info_ptr->y_offset;
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315 | }
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316 | #else
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317 | PNG_UNUSED(png_ptr)
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318 | PNG_UNUSED(info_ptr)
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319 | #endif
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320 |
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321 | return 0;
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322 | }
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323 |
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324 | #ifdef PNG_INCH_CONVERSIONS_SUPPORTED
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325 | static png_uint_32
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326 | ppi_from_ppm(png_uint_32 ppm)
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327 | {
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328 | #if 0
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329 | /* The conversion is *(2.54/100), in binary (32 digits):
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330 | * .00000110100000001001110101001001
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331 | */
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332 | png_uint_32 t1001, t1101;
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333 | ppm >>= 1; /* .1 */
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334 | t1001 = ppm + (ppm >> 3); /* .1001 */
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335 | t1101 = t1001 + (ppm >> 1); /* .1101 */
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336 | ppm >>= 20; /* .000000000000000000001 */
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337 | t1101 += t1101 >> 15; /* .1101000000000001101 */
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338 | t1001 >>= 11; /* .000000000001001 */
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339 | t1001 += t1001 >> 12; /* .000000000001001000000001001 */
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340 | ppm += t1001; /* .000000000001001000001001001 */
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341 | ppm += t1101; /* .110100000001001110101001001 */
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342 | return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
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343 | #else
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344 | /* The argument is a PNG unsigned integer, so it is not permitted
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345 | * to be bigger than 2^31.
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346 | */
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347 | png_fixed_point result;
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348 | if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
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349 | 5000) != 0)
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350 | return (png_uint_32)result;
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351 |
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352 | /* Overflow. */
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353 | return 0;
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354 | #endif
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355 | }
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356 |
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357 | png_uint_32 PNGAPI
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358 | png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
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359 | {
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360 | return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
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361 | }
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362 |
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363 | png_uint_32 PNGAPI
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364 | png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
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365 | {
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366 | return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
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367 | }
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368 |
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369 | png_uint_32 PNGAPI
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370 | png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
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371 | {
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372 | return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
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373 | }
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374 |
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375 | #ifdef PNG_FIXED_POINT_SUPPORTED
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376 | static png_fixed_point
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377 | png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
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378 | {
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379 | /* Convert from meters * 1,000,000 to inches * 100,000, meters to
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380 | * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
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381 | * Notice that this can overflow - a warning is output and 0 is
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382 | * returned.
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383 | */
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384 | return png_muldiv_warn(png_ptr, microns, 500, 127);
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385 | }
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386 |
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387 | png_fixed_point PNGAPI
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388 | png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
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389 | png_const_inforp info_ptr)
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390 | {
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391 | return png_fixed_inches_from_microns(png_ptr,
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392 | png_get_x_offset_microns(png_ptr, info_ptr));
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393 | }
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394 | #endif
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395 |
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396 | #ifdef PNG_FIXED_POINT_SUPPORTED
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397 | png_fixed_point PNGAPI
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398 | png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
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399 | png_const_inforp info_ptr)
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400 | {
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401 | return png_fixed_inches_from_microns(png_ptr,
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402 | png_get_y_offset_microns(png_ptr, info_ptr));
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403 | }
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404 | #endif
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405 |
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406 | #ifdef PNG_FLOATING_POINT_SUPPORTED
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407 | float PNGAPI
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408 | png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
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409 | {
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410 | /* To avoid the overflow do the conversion directly in floating
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411 | * point.
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412 | */
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413 | return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
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414 | }
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415 | #endif
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416 |
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417 | #ifdef PNG_FLOATING_POINT_SUPPORTED
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418 | float PNGAPI
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419 | png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
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420 | {
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421 | /* To avoid the overflow do the conversion directly in floating
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422 | * point.
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423 | */
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424 | return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
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425 | }
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426 | #endif
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427 |
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428 | #ifdef PNG_pHYs_SUPPORTED
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429 | png_uint_32 PNGAPI
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430 | png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
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431 | png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
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432 | {
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433 | png_uint_32 retval = 0;
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434 |
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435 | png_debug1(1, "in %s retrieval function", "pHYs");
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436 |
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437 | if (png_ptr != NULL && info_ptr != NULL &&
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438 | (info_ptr->valid & PNG_INFO_pHYs) != 0)
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439 | {
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440 | if (res_x != NULL)
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441 | {
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442 | *res_x = info_ptr->x_pixels_per_unit;
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443 | retval |= PNG_INFO_pHYs;
|
---|
444 | }
|
---|
445 |
|
---|
446 | if (res_y != NULL)
|
---|
447 | {
|
---|
448 | *res_y = info_ptr->y_pixels_per_unit;
|
---|
449 | retval |= PNG_INFO_pHYs;
|
---|
450 | }
|
---|
451 |
|
---|
452 | if (unit_type != NULL)
|
---|
453 | {
|
---|
454 | *unit_type = (int)info_ptr->phys_unit_type;
|
---|
455 | retval |= PNG_INFO_pHYs;
|
---|
456 |
|
---|
457 | if (*unit_type == 1)
|
---|
458 | {
|
---|
459 | if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
|
---|
460 | if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
|
---|
461 | }
|
---|
462 | }
|
---|
463 | }
|
---|
464 |
|
---|
465 | return retval;
|
---|
466 | }
|
---|
467 | #endif /* pHYs */
|
---|
468 | #endif /* INCH_CONVERSIONS */
|
---|
469 |
|
---|
470 | /* png_get_channels really belongs in here, too, but it's been around longer */
|
---|
471 |
|
---|
472 | #endif /* EASY_ACCESS */
|
---|
473 |
|
---|
474 |
|
---|
475 | png_byte PNGAPI
|
---|
476 | png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
|
---|
477 | {
|
---|
478 | if (png_ptr != NULL && info_ptr != NULL)
|
---|
479 | return info_ptr->channels;
|
---|
480 |
|
---|
481 | return 0;
|
---|
482 | }
|
---|
483 |
|
---|
484 | #ifdef PNG_READ_SUPPORTED
|
---|
485 | png_const_bytep PNGAPI
|
---|
486 | png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
|
---|
487 | {
|
---|
488 | if (png_ptr != NULL && info_ptr != NULL)
|
---|
489 | return info_ptr->signature;
|
---|
490 |
|
---|
491 | return NULL;
|
---|
492 | }
|
---|
493 | #endif
|
---|
494 |
|
---|
495 | #ifdef PNG_bKGD_SUPPORTED
|
---|
496 | png_uint_32 PNGAPI
|
---|
497 | png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
498 | png_color_16p *background)
|
---|
499 | {
|
---|
500 | png_debug1(1, "in %s retrieval function", "bKGD");
|
---|
501 |
|
---|
502 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
503 | (info_ptr->valid & PNG_INFO_bKGD) != 0 &&
|
---|
504 | background != NULL)
|
---|
505 | {
|
---|
506 | *background = &(info_ptr->background);
|
---|
507 | return PNG_INFO_bKGD;
|
---|
508 | }
|
---|
509 |
|
---|
510 | return 0;
|
---|
511 | }
|
---|
512 | #endif
|
---|
513 |
|
---|
514 | #ifdef PNG_cHRM_SUPPORTED
|
---|
515 | /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
|
---|
516 | * same time to correct the rgb grayscale coefficient defaults obtained from the
|
---|
517 | * cHRM chunk in 1.5.4
|
---|
518 | */
|
---|
519 | # ifdef PNG_FLOATING_POINT_SUPPORTED
|
---|
520 | png_uint_32 PNGAPI
|
---|
521 | png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
522 | double *white_x, double *white_y, double *red_x, double *red_y,
|
---|
523 | double *green_x, double *green_y, double *blue_x, double *blue_y)
|
---|
524 | {
|
---|
525 | png_debug1(1, "in %s retrieval function", "cHRM");
|
---|
526 |
|
---|
527 | /* Quiet API change: this code used to only return the end points if a cHRM
|
---|
528 | * chunk was present, but the end points can also come from iCCP or sRGB
|
---|
529 | * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
|
---|
530 | * the png_set_ APIs merely check that set end points are mutually
|
---|
531 | * consistent.
|
---|
532 | */
|
---|
533 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
534 | (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
|
---|
535 | {
|
---|
536 | if (white_x != NULL)
|
---|
537 | *white_x = png_float(png_ptr,
|
---|
538 | info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
|
---|
539 | if (white_y != NULL)
|
---|
540 | *white_y = png_float(png_ptr,
|
---|
541 | info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
|
---|
542 | if (red_x != NULL)
|
---|
543 | *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
|
---|
544 | "cHRM red X");
|
---|
545 | if (red_y != NULL)
|
---|
546 | *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
|
---|
547 | "cHRM red Y");
|
---|
548 | if (green_x != NULL)
|
---|
549 | *green_x = png_float(png_ptr,
|
---|
550 | info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
|
---|
551 | if (green_y != NULL)
|
---|
552 | *green_y = png_float(png_ptr,
|
---|
553 | info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
|
---|
554 | if (blue_x != NULL)
|
---|
555 | *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
|
---|
556 | "cHRM blue X");
|
---|
557 | if (blue_y != NULL)
|
---|
558 | *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
|
---|
559 | "cHRM blue Y");
|
---|
560 | return PNG_INFO_cHRM;
|
---|
561 | }
|
---|
562 |
|
---|
563 | return 0;
|
---|
564 | }
|
---|
565 |
|
---|
566 | png_uint_32 PNGAPI
|
---|
567 | png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
568 | double *red_X, double *red_Y, double *red_Z, double *green_X,
|
---|
569 | double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
|
---|
570 | double *blue_Z)
|
---|
571 | {
|
---|
572 | png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
|
---|
573 |
|
---|
574 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
575 | (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
|
---|
576 | {
|
---|
577 | if (red_X != NULL)
|
---|
578 | *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
|
---|
579 | "cHRM red X");
|
---|
580 | if (red_Y != NULL)
|
---|
581 | *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
|
---|
582 | "cHRM red Y");
|
---|
583 | if (red_Z != NULL)
|
---|
584 | *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
|
---|
585 | "cHRM red Z");
|
---|
586 | if (green_X != NULL)
|
---|
587 | *green_X = png_float(png_ptr,
|
---|
588 | info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
|
---|
589 | if (green_Y != NULL)
|
---|
590 | *green_Y = png_float(png_ptr,
|
---|
591 | info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
|
---|
592 | if (green_Z != NULL)
|
---|
593 | *green_Z = png_float(png_ptr,
|
---|
594 | info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
|
---|
595 | if (blue_X != NULL)
|
---|
596 | *blue_X = png_float(png_ptr,
|
---|
597 | info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
|
---|
598 | if (blue_Y != NULL)
|
---|
599 | *blue_Y = png_float(png_ptr,
|
---|
600 | info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
|
---|
601 | if (blue_Z != NULL)
|
---|
602 | *blue_Z = png_float(png_ptr,
|
---|
603 | info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");
|
---|
604 | return PNG_INFO_cHRM;
|
---|
605 | }
|
---|
606 |
|
---|
607 | return 0;
|
---|
608 | }
|
---|
609 | # endif
|
---|
610 |
|
---|
611 | # ifdef PNG_FIXED_POINT_SUPPORTED
|
---|
612 | png_uint_32 PNGAPI
|
---|
613 | png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
614 | png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
|
---|
615 | png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
|
---|
616 | png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
|
---|
617 | png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
|
---|
618 | png_fixed_point *int_blue_Z)
|
---|
619 | {
|
---|
620 | png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
|
---|
621 |
|
---|
622 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
623 | (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
|
---|
624 | {
|
---|
625 | if (int_red_X != NULL)
|
---|
626 | *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
|
---|
627 | if (int_red_Y != NULL)
|
---|
628 | *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
|
---|
629 | if (int_red_Z != NULL)
|
---|
630 | *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
|
---|
631 | if (int_green_X != NULL)
|
---|
632 | *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
|
---|
633 | if (int_green_Y != NULL)
|
---|
634 | *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
|
---|
635 | if (int_green_Z != NULL)
|
---|
636 | *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
|
---|
637 | if (int_blue_X != NULL)
|
---|
638 | *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
|
---|
639 | if (int_blue_Y != NULL)
|
---|
640 | *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
|
---|
641 | if (int_blue_Z != NULL)
|
---|
642 | *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;
|
---|
643 | return PNG_INFO_cHRM;
|
---|
644 | }
|
---|
645 |
|
---|
646 | return 0;
|
---|
647 | }
|
---|
648 |
|
---|
649 | png_uint_32 PNGAPI
|
---|
650 | png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
651 | png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
|
---|
652 | png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
|
---|
653 | png_fixed_point *blue_x, png_fixed_point *blue_y)
|
---|
654 | {
|
---|
655 | png_debug1(1, "in %s retrieval function", "cHRM");
|
---|
656 |
|
---|
657 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
658 | (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)
|
---|
659 | {
|
---|
660 | if (white_x != NULL)
|
---|
661 | *white_x = info_ptr->colorspace.end_points_xy.whitex;
|
---|
662 | if (white_y != NULL)
|
---|
663 | *white_y = info_ptr->colorspace.end_points_xy.whitey;
|
---|
664 | if (red_x != NULL)
|
---|
665 | *red_x = info_ptr->colorspace.end_points_xy.redx;
|
---|
666 | if (red_y != NULL)
|
---|
667 | *red_y = info_ptr->colorspace.end_points_xy.redy;
|
---|
668 | if (green_x != NULL)
|
---|
669 | *green_x = info_ptr->colorspace.end_points_xy.greenx;
|
---|
670 | if (green_y != NULL)
|
---|
671 | *green_y = info_ptr->colorspace.end_points_xy.greeny;
|
---|
672 | if (blue_x != NULL)
|
---|
673 | *blue_x = info_ptr->colorspace.end_points_xy.bluex;
|
---|
674 | if (blue_y != NULL)
|
---|
675 | *blue_y = info_ptr->colorspace.end_points_xy.bluey;
|
---|
676 | return PNG_INFO_cHRM;
|
---|
677 | }
|
---|
678 |
|
---|
679 | return 0;
|
---|
680 | }
|
---|
681 | # endif
|
---|
682 | #endif
|
---|
683 |
|
---|
684 | #ifdef PNG_gAMA_SUPPORTED
|
---|
685 | # ifdef PNG_FIXED_POINT_SUPPORTED
|
---|
686 | png_uint_32 PNGAPI
|
---|
687 | png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
688 | png_fixed_point *file_gamma)
|
---|
689 | {
|
---|
690 | png_debug1(1, "in %s retrieval function", "gAMA");
|
---|
691 |
|
---|
692 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
693 | (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
|
---|
694 | file_gamma != NULL)
|
---|
695 | {
|
---|
696 | *file_gamma = info_ptr->colorspace.gamma;
|
---|
697 | return PNG_INFO_gAMA;
|
---|
698 | }
|
---|
699 |
|
---|
700 | return 0;
|
---|
701 | }
|
---|
702 | # endif
|
---|
703 |
|
---|
704 | # ifdef PNG_FLOATING_POINT_SUPPORTED
|
---|
705 | png_uint_32 PNGAPI
|
---|
706 | png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
707 | double *file_gamma)
|
---|
708 | {
|
---|
709 | png_debug1(1, "in %s retrieval function", "gAMA(float)");
|
---|
710 |
|
---|
711 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
712 | (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&
|
---|
713 | file_gamma != NULL)
|
---|
714 | {
|
---|
715 | *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
|
---|
716 | "png_get_gAMA");
|
---|
717 | return PNG_INFO_gAMA;
|
---|
718 | }
|
---|
719 |
|
---|
720 | return 0;
|
---|
721 | }
|
---|
722 | # endif
|
---|
723 | #endif
|
---|
724 |
|
---|
725 | #ifdef PNG_sRGB_SUPPORTED
|
---|
726 | png_uint_32 PNGAPI
|
---|
727 | png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
728 | int *file_srgb_intent)
|
---|
729 | {
|
---|
730 | png_debug1(1, "in %s retrieval function", "sRGB");
|
---|
731 |
|
---|
732 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
733 | (info_ptr->valid & PNG_INFO_sRGB) != 0 && file_srgb_intent != NULL)
|
---|
734 | {
|
---|
735 | *file_srgb_intent = info_ptr->colorspace.rendering_intent;
|
---|
736 | return PNG_INFO_sRGB;
|
---|
737 | }
|
---|
738 |
|
---|
739 | return 0;
|
---|
740 | }
|
---|
741 | #endif
|
---|
742 |
|
---|
743 | #ifdef PNG_iCCP_SUPPORTED
|
---|
744 | png_uint_32 PNGAPI
|
---|
745 | png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
746 | png_charpp name, int *compression_type,
|
---|
747 | png_bytepp profile, png_uint_32 *proflen)
|
---|
748 | {
|
---|
749 | png_debug1(1, "in %s retrieval function", "iCCP");
|
---|
750 |
|
---|
751 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
752 | (info_ptr->valid & PNG_INFO_iCCP) != 0 &&
|
---|
753 | name != NULL && profile != NULL && proflen != NULL)
|
---|
754 | {
|
---|
755 | *name = info_ptr->iccp_name;
|
---|
756 | *profile = info_ptr->iccp_profile;
|
---|
757 | *proflen = png_get_uint_32(info_ptr->iccp_profile);
|
---|
758 | /* This is somewhat irrelevant since the profile data returned has
|
---|
759 | * actually been uncompressed.
|
---|
760 | */
|
---|
761 | if (compression_type != NULL)
|
---|
762 | *compression_type = PNG_COMPRESSION_TYPE_BASE;
|
---|
763 | return PNG_INFO_iCCP;
|
---|
764 | }
|
---|
765 |
|
---|
766 | return 0;
|
---|
767 |
|
---|
768 | }
|
---|
769 | #endif
|
---|
770 |
|
---|
771 | #ifdef PNG_sPLT_SUPPORTED
|
---|
772 | int PNGAPI
|
---|
773 | png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
774 | png_sPLT_tpp spalettes)
|
---|
775 | {
|
---|
776 | png_debug1(1, "in %s retrieval function", "sPLT");
|
---|
777 |
|
---|
778 | if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
|
---|
779 | {
|
---|
780 | *spalettes = info_ptr->splt_palettes;
|
---|
781 | return info_ptr->splt_palettes_num;
|
---|
782 | }
|
---|
783 |
|
---|
784 | return 0;
|
---|
785 | }
|
---|
786 | #endif
|
---|
787 |
|
---|
788 | #ifdef PNG_eXIf_SUPPORTED
|
---|
789 | png_uint_32 PNGAPI
|
---|
790 | png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
791 | png_bytep *exif)
|
---|
792 | {
|
---|
793 | png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");
|
---|
794 | PNG_UNUSED(info_ptr)
|
---|
795 | PNG_UNUSED(exif)
|
---|
796 | return 0;
|
---|
797 | }
|
---|
798 |
|
---|
799 | png_uint_32 PNGAPI
|
---|
800 | png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
801 | png_uint_32 *num_exif, png_bytep *exif)
|
---|
802 | {
|
---|
803 | png_debug1(1, "in %s retrieval function", "eXIf");
|
---|
804 |
|
---|
805 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
806 | (info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)
|
---|
807 | {
|
---|
808 | *num_exif = info_ptr->num_exif;
|
---|
809 | *exif = info_ptr->exif;
|
---|
810 | return PNG_INFO_eXIf;
|
---|
811 | }
|
---|
812 |
|
---|
813 | return 0;
|
---|
814 | }
|
---|
815 | #endif
|
---|
816 |
|
---|
817 | #ifdef PNG_hIST_SUPPORTED
|
---|
818 | png_uint_32 PNGAPI
|
---|
819 | png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
820 | png_uint_16p *hist)
|
---|
821 | {
|
---|
822 | png_debug1(1, "in %s retrieval function", "hIST");
|
---|
823 |
|
---|
824 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
825 | (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)
|
---|
826 | {
|
---|
827 | *hist = info_ptr->hist;
|
---|
828 | return PNG_INFO_hIST;
|
---|
829 | }
|
---|
830 |
|
---|
831 | return 0;
|
---|
832 | }
|
---|
833 | #endif
|
---|
834 |
|
---|
835 | png_uint_32 PNGAPI
|
---|
836 | png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
837 | png_uint_32 *width, png_uint_32 *height, int *bit_depth,
|
---|
838 | int *color_type, int *interlace_type, int *compression_type,
|
---|
839 | int *filter_type)
|
---|
840 | {
|
---|
841 | png_debug1(1, "in %s retrieval function", "IHDR");
|
---|
842 |
|
---|
843 | if (png_ptr == NULL || info_ptr == NULL)
|
---|
844 | return 0;
|
---|
845 |
|
---|
846 | if (width != NULL)
|
---|
847 | *width = info_ptr->width;
|
---|
848 |
|
---|
849 | if (height != NULL)
|
---|
850 | *height = info_ptr->height;
|
---|
851 |
|
---|
852 | if (bit_depth != NULL)
|
---|
853 | *bit_depth = info_ptr->bit_depth;
|
---|
854 |
|
---|
855 | if (color_type != NULL)
|
---|
856 | *color_type = info_ptr->color_type;
|
---|
857 |
|
---|
858 | if (compression_type != NULL)
|
---|
859 | *compression_type = info_ptr->compression_type;
|
---|
860 |
|
---|
861 | if (filter_type != NULL)
|
---|
862 | *filter_type = info_ptr->filter_type;
|
---|
863 |
|
---|
864 | if (interlace_type != NULL)
|
---|
865 | *interlace_type = info_ptr->interlace_type;
|
---|
866 |
|
---|
867 | /* This is redundant if we can be sure that the info_ptr values were all
|
---|
868 | * assigned in png_set_IHDR(). We do the check anyhow in case an
|
---|
869 | * application has ignored our advice not to mess with the members
|
---|
870 | * of info_ptr directly.
|
---|
871 | */
|
---|
872 | png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
|
---|
873 | info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
|
---|
874 | info_ptr->compression_type, info_ptr->filter_type);
|
---|
875 |
|
---|
876 | return 1;
|
---|
877 | }
|
---|
878 |
|
---|
879 | #ifdef PNG_oFFs_SUPPORTED
|
---|
880 | png_uint_32 PNGAPI
|
---|
881 | png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
882 | png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
|
---|
883 | {
|
---|
884 | png_debug1(1, "in %s retrieval function", "oFFs");
|
---|
885 |
|
---|
886 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
887 | (info_ptr->valid & PNG_INFO_oFFs) != 0 &&
|
---|
888 | offset_x != NULL && offset_y != NULL && unit_type != NULL)
|
---|
889 | {
|
---|
890 | *offset_x = info_ptr->x_offset;
|
---|
891 | *offset_y = info_ptr->y_offset;
|
---|
892 | *unit_type = (int)info_ptr->offset_unit_type;
|
---|
893 | return PNG_INFO_oFFs;
|
---|
894 | }
|
---|
895 |
|
---|
896 | return 0;
|
---|
897 | }
|
---|
898 | #endif
|
---|
899 |
|
---|
900 | #ifdef PNG_pCAL_SUPPORTED
|
---|
901 | png_uint_32 PNGAPI
|
---|
902 | png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
903 | png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
|
---|
904 | png_charp *units, png_charpp *params)
|
---|
905 | {
|
---|
906 | png_debug1(1, "in %s retrieval function", "pCAL");
|
---|
907 |
|
---|
908 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
909 | (info_ptr->valid & PNG_INFO_pCAL) != 0 &&
|
---|
910 | purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
|
---|
911 | nparams != NULL && units != NULL && params != NULL)
|
---|
912 | {
|
---|
913 | *purpose = info_ptr->pcal_purpose;
|
---|
914 | *X0 = info_ptr->pcal_X0;
|
---|
915 | *X1 = info_ptr->pcal_X1;
|
---|
916 | *type = (int)info_ptr->pcal_type;
|
---|
917 | *nparams = (int)info_ptr->pcal_nparams;
|
---|
918 | *units = info_ptr->pcal_units;
|
---|
919 | *params = info_ptr->pcal_params;
|
---|
920 | return PNG_INFO_pCAL;
|
---|
921 | }
|
---|
922 |
|
---|
923 | return 0;
|
---|
924 | }
|
---|
925 | #endif
|
---|
926 |
|
---|
927 | #ifdef PNG_sCAL_SUPPORTED
|
---|
928 | # ifdef PNG_FIXED_POINT_SUPPORTED
|
---|
929 | # if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
|
---|
930 | defined(PNG_FLOATING_POINT_SUPPORTED)
|
---|
931 | png_uint_32 PNGAPI
|
---|
932 | png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
933 | int *unit, png_fixed_point *width, png_fixed_point *height)
|
---|
934 | {
|
---|
935 | png_debug1(1, "in %s retrieval function", "sCAL");
|
---|
936 |
|
---|
937 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
938 | (info_ptr->valid & PNG_INFO_sCAL) != 0)
|
---|
939 | {
|
---|
940 | *unit = info_ptr->scal_unit;
|
---|
941 | /*TODO: make this work without FP support; the API is currently eliminated
|
---|
942 | * if neither floating point APIs nor internal floating point arithmetic
|
---|
943 | * are enabled.
|
---|
944 | */
|
---|
945 | *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
|
---|
946 | *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
|
---|
947 | "sCAL height");
|
---|
948 | return PNG_INFO_sCAL;
|
---|
949 | }
|
---|
950 |
|
---|
951 | return 0;
|
---|
952 | }
|
---|
953 | # endif /* FLOATING_ARITHMETIC */
|
---|
954 | # endif /* FIXED_POINT */
|
---|
955 | # ifdef PNG_FLOATING_POINT_SUPPORTED
|
---|
956 | png_uint_32 PNGAPI
|
---|
957 | png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
958 | int *unit, double *width, double *height)
|
---|
959 | {
|
---|
960 | png_debug1(1, "in %s retrieval function", "sCAL(float)");
|
---|
961 |
|
---|
962 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
963 | (info_ptr->valid & PNG_INFO_sCAL) != 0)
|
---|
964 | {
|
---|
965 | *unit = info_ptr->scal_unit;
|
---|
966 | *width = atof(info_ptr->scal_s_width);
|
---|
967 | *height = atof(info_ptr->scal_s_height);
|
---|
968 | return PNG_INFO_sCAL;
|
---|
969 | }
|
---|
970 |
|
---|
971 | return 0;
|
---|
972 | }
|
---|
973 | # endif /* FLOATING POINT */
|
---|
974 | png_uint_32 PNGAPI
|
---|
975 | png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
976 | int *unit, png_charpp width, png_charpp height)
|
---|
977 | {
|
---|
978 | png_debug1(1, "in %s retrieval function", "sCAL(str)");
|
---|
979 |
|
---|
980 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
981 | (info_ptr->valid & PNG_INFO_sCAL) != 0)
|
---|
982 | {
|
---|
983 | *unit = info_ptr->scal_unit;
|
---|
984 | *width = info_ptr->scal_s_width;
|
---|
985 | *height = info_ptr->scal_s_height;
|
---|
986 | return PNG_INFO_sCAL;
|
---|
987 | }
|
---|
988 |
|
---|
989 | return 0;
|
---|
990 | }
|
---|
991 | #endif /* sCAL */
|
---|
992 |
|
---|
993 | #ifdef PNG_pHYs_SUPPORTED
|
---|
994 | png_uint_32 PNGAPI
|
---|
995 | png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
|
---|
996 | png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
|
---|
997 | {
|
---|
998 | png_uint_32 retval = 0;
|
---|
999 |
|
---|
1000 | png_debug1(1, "in %s retrieval function", "pHYs");
|
---|
1001 |
|
---|
1002 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
1003 | (info_ptr->valid & PNG_INFO_pHYs) != 0)
|
---|
1004 | {
|
---|
1005 | if (res_x != NULL)
|
---|
1006 | {
|
---|
1007 | *res_x = info_ptr->x_pixels_per_unit;
|
---|
1008 | retval |= PNG_INFO_pHYs;
|
---|
1009 | }
|
---|
1010 |
|
---|
1011 | if (res_y != NULL)
|
---|
1012 | {
|
---|
1013 | *res_y = info_ptr->y_pixels_per_unit;
|
---|
1014 | retval |= PNG_INFO_pHYs;
|
---|
1015 | }
|
---|
1016 |
|
---|
1017 | if (unit_type != NULL)
|
---|
1018 | {
|
---|
1019 | *unit_type = (int)info_ptr->phys_unit_type;
|
---|
1020 | retval |= PNG_INFO_pHYs;
|
---|
1021 | }
|
---|
1022 | }
|
---|
1023 |
|
---|
1024 | return retval;
|
---|
1025 | }
|
---|
1026 | #endif /* pHYs */
|
---|
1027 |
|
---|
1028 | png_uint_32 PNGAPI
|
---|
1029 | png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
1030 | png_colorp *palette, int *num_palette)
|
---|
1031 | {
|
---|
1032 | png_debug1(1, "in %s retrieval function", "PLTE");
|
---|
1033 |
|
---|
1034 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
1035 | (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)
|
---|
1036 | {
|
---|
1037 | *palette = info_ptr->palette;
|
---|
1038 | *num_palette = info_ptr->num_palette;
|
---|
1039 | png_debug1(3, "num_palette = %d", *num_palette);
|
---|
1040 | return PNG_INFO_PLTE;
|
---|
1041 | }
|
---|
1042 |
|
---|
1043 | return 0;
|
---|
1044 | }
|
---|
1045 |
|
---|
1046 | #ifdef PNG_sBIT_SUPPORTED
|
---|
1047 | png_uint_32 PNGAPI
|
---|
1048 | png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
1049 | png_color_8p *sig_bit)
|
---|
1050 | {
|
---|
1051 | png_debug1(1, "in %s retrieval function", "sBIT");
|
---|
1052 |
|
---|
1053 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
1054 | (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)
|
---|
1055 | {
|
---|
1056 | *sig_bit = &(info_ptr->sig_bit);
|
---|
1057 | return PNG_INFO_sBIT;
|
---|
1058 | }
|
---|
1059 |
|
---|
1060 | return 0;
|
---|
1061 | }
|
---|
1062 | #endif
|
---|
1063 |
|
---|
1064 | #ifdef PNG_TEXT_SUPPORTED
|
---|
1065 | int PNGAPI
|
---|
1066 | png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
1067 | png_textp *text_ptr, int *num_text)
|
---|
1068 | {
|
---|
1069 | if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
|
---|
1070 | {
|
---|
1071 | png_debug1(1, "in text retrieval function, chunk typeid = 0x%lx",
|
---|
1072 | (unsigned long)png_ptr->chunk_name);
|
---|
1073 |
|
---|
1074 | if (text_ptr != NULL)
|
---|
1075 | *text_ptr = info_ptr->text;
|
---|
1076 |
|
---|
1077 | if (num_text != NULL)
|
---|
1078 | *num_text = info_ptr->num_text;
|
---|
1079 |
|
---|
1080 | return info_ptr->num_text;
|
---|
1081 | }
|
---|
1082 |
|
---|
1083 | if (num_text != NULL)
|
---|
1084 | *num_text = 0;
|
---|
1085 |
|
---|
1086 | return 0;
|
---|
1087 | }
|
---|
1088 | #endif
|
---|
1089 |
|
---|
1090 | #ifdef PNG_tIME_SUPPORTED
|
---|
1091 | png_uint_32 PNGAPI
|
---|
1092 | png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
1093 | png_timep *mod_time)
|
---|
1094 | {
|
---|
1095 | png_debug1(1, "in %s retrieval function", "tIME");
|
---|
1096 |
|
---|
1097 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
1098 | (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)
|
---|
1099 | {
|
---|
1100 | *mod_time = &(info_ptr->mod_time);
|
---|
1101 | return PNG_INFO_tIME;
|
---|
1102 | }
|
---|
1103 |
|
---|
1104 | return 0;
|
---|
1105 | }
|
---|
1106 | #endif
|
---|
1107 |
|
---|
1108 | #ifdef PNG_tRNS_SUPPORTED
|
---|
1109 | png_uint_32 PNGAPI
|
---|
1110 | png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
1111 | png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
|
---|
1112 | {
|
---|
1113 | png_uint_32 retval = 0;
|
---|
1114 |
|
---|
1115 | png_debug1(1, "in %s retrieval function", "tRNS");
|
---|
1116 |
|
---|
1117 | if (png_ptr != NULL && info_ptr != NULL &&
|
---|
1118 | (info_ptr->valid & PNG_INFO_tRNS) != 0)
|
---|
1119 | {
|
---|
1120 | if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
|
---|
1121 | {
|
---|
1122 | if (trans_alpha != NULL)
|
---|
1123 | {
|
---|
1124 | *trans_alpha = info_ptr->trans_alpha;
|
---|
1125 | retval |= PNG_INFO_tRNS;
|
---|
1126 | }
|
---|
1127 |
|
---|
1128 | if (trans_color != NULL)
|
---|
1129 | *trans_color = &(info_ptr->trans_color);
|
---|
1130 | }
|
---|
1131 |
|
---|
1132 | else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
|
---|
1133 | {
|
---|
1134 | if (trans_color != NULL)
|
---|
1135 | {
|
---|
1136 | *trans_color = &(info_ptr->trans_color);
|
---|
1137 | retval |= PNG_INFO_tRNS;
|
---|
1138 | }
|
---|
1139 |
|
---|
1140 | if (trans_alpha != NULL)
|
---|
1141 | *trans_alpha = NULL;
|
---|
1142 | }
|
---|
1143 |
|
---|
1144 | if (num_trans != NULL)
|
---|
1145 | {
|
---|
1146 | *num_trans = info_ptr->num_trans;
|
---|
1147 | retval |= PNG_INFO_tRNS;
|
---|
1148 | }
|
---|
1149 | }
|
---|
1150 |
|
---|
1151 | return retval;
|
---|
1152 | }
|
---|
1153 | #endif
|
---|
1154 |
|
---|
1155 | #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
|
---|
1156 | int PNGAPI
|
---|
1157 | png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
|
---|
1158 | png_unknown_chunkpp unknowns)
|
---|
1159 | {
|
---|
1160 | if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
|
---|
1161 | {
|
---|
1162 | *unknowns = info_ptr->unknown_chunks;
|
---|
1163 | return info_ptr->unknown_chunks_num;
|
---|
1164 | }
|
---|
1165 |
|
---|
1166 | return 0;
|
---|
1167 | }
|
---|
1168 | #endif
|
---|
1169 |
|
---|
1170 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
---|
1171 | png_byte PNGAPI
|
---|
1172 | png_get_rgb_to_gray_status(png_const_structrp png_ptr)
|
---|
1173 | {
|
---|
1174 | return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
|
---|
1175 | }
|
---|
1176 | #endif
|
---|
1177 |
|
---|
1178 | #ifdef PNG_USER_CHUNKS_SUPPORTED
|
---|
1179 | png_voidp PNGAPI
|
---|
1180 | png_get_user_chunk_ptr(png_const_structrp png_ptr)
|
---|
1181 | {
|
---|
1182 | return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
|
---|
1183 | }
|
---|
1184 | #endif
|
---|
1185 |
|
---|
1186 | size_t PNGAPI
|
---|
1187 | png_get_compression_buffer_size(png_const_structrp png_ptr)
|
---|
1188 | {
|
---|
1189 | if (png_ptr == NULL)
|
---|
1190 | return 0;
|
---|
1191 |
|
---|
1192 | #ifdef PNG_WRITE_SUPPORTED
|
---|
1193 | if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
|
---|
1194 | #endif
|
---|
1195 | {
|
---|
1196 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
---|
1197 | return png_ptr->IDAT_read_size;
|
---|
1198 | #else
|
---|
1199 | return PNG_IDAT_READ_SIZE;
|
---|
1200 | #endif
|
---|
1201 | }
|
---|
1202 |
|
---|
1203 | #ifdef PNG_WRITE_SUPPORTED
|
---|
1204 | else
|
---|
1205 | return png_ptr->zbuffer_size;
|
---|
1206 | #endif
|
---|
1207 | }
|
---|
1208 |
|
---|
1209 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
---|
1210 | /* These functions were added to libpng 1.2.6 and were enabled
|
---|
1211 | * by default in libpng-1.4.0 */
|
---|
1212 | png_uint_32 PNGAPI
|
---|
1213 | png_get_user_width_max(png_const_structrp png_ptr)
|
---|
1214 | {
|
---|
1215 | return (png_ptr ? png_ptr->user_width_max : 0);
|
---|
1216 | }
|
---|
1217 |
|
---|
1218 | png_uint_32 PNGAPI
|
---|
1219 | png_get_user_height_max(png_const_structrp png_ptr)
|
---|
1220 | {
|
---|
1221 | return (png_ptr ? png_ptr->user_height_max : 0);
|
---|
1222 | }
|
---|
1223 |
|
---|
1224 | /* This function was added to libpng 1.4.0 */
|
---|
1225 | png_uint_32 PNGAPI
|
---|
1226 | png_get_chunk_cache_max(png_const_structrp png_ptr)
|
---|
1227 | {
|
---|
1228 | return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
|
---|
1229 | }
|
---|
1230 |
|
---|
1231 | /* This function was added to libpng 1.4.1 */
|
---|
1232 | png_alloc_size_t PNGAPI
|
---|
1233 | png_get_chunk_malloc_max(png_const_structrp png_ptr)
|
---|
1234 | {
|
---|
1235 | return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
|
---|
1236 | }
|
---|
1237 | #endif /* SET_USER_LIMITS */
|
---|
1238 |
|
---|
1239 | /* These functions were added to libpng 1.4.0 */
|
---|
1240 | #ifdef PNG_IO_STATE_SUPPORTED
|
---|
1241 | png_uint_32 PNGAPI
|
---|
1242 | png_get_io_state(png_const_structrp png_ptr)
|
---|
1243 | {
|
---|
1244 | return png_ptr->io_state;
|
---|
1245 | }
|
---|
1246 |
|
---|
1247 | png_uint_32 PNGAPI
|
---|
1248 | png_get_io_chunk_type(png_const_structrp png_ptr)
|
---|
1249 | {
|
---|
1250 | return png_ptr->chunk_name;
|
---|
1251 | }
|
---|
1252 | #endif /* IO_STATE */
|
---|
1253 |
|
---|
1254 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
|
---|
1255 | # ifdef PNG_GET_PALETTE_MAX_SUPPORTED
|
---|
1256 | int PNGAPI
|
---|
1257 | png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
|
---|
1258 | {
|
---|
1259 | if (png_ptr != NULL && info_ptr != NULL)
|
---|
1260 | return png_ptr->num_palette_max;
|
---|
1261 |
|
---|
1262 | return -1;
|
---|
1263 | }
|
---|
1264 | # endif
|
---|
1265 | #endif
|
---|
1266 |
|
---|
1267 | #endif /* READ || WRITE */
|
---|