1 | /*------------------------------------- |
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2 | * PNGFILE.C -- Image File Functions |
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3 | *------------------------------------- |
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4 | * |
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5 | * Copyright 2000, Willem van Schaik. |
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6 | * |
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7 | * This code is released under the libpng license. |
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8 | * For conditions of distribution and use, see the disclaimer |
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9 | * and license in png.h |
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10 | */ |
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11 | |
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12 | #include <windows.h> |
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13 | #include <commdlg.h> |
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14 | #include <stdio.h> |
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15 | #include <stdlib.h> |
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16 | #include <zlib.h> |
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17 | |
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18 | #include "png.h" |
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19 | #include "pngfile.h" |
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20 | #include "cexcept.h" |
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21 | |
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22 | define_exception_type(const char *); |
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23 | extern struct exception_context the_exception_context[1]; |
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24 | struct exception_context the_exception_context[1]; |
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25 | png_const_charp msg; |
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26 | |
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27 | static OPENFILENAME ofn; |
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28 | |
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29 | static png_structp png_ptr = NULL; |
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30 | static png_infop info_ptr = NULL; |
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31 | |
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32 | |
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33 | /* cexcept interface */ |
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34 | |
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35 | static void |
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36 | png_cexcept_error(png_structp png_ptr, png_const_charp msg) |
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37 | { |
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38 | if(png_ptr) |
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39 | ; |
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40 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
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41 | fprintf(stderr, "libpng error: %s\n", msg); |
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42 | #endif |
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43 | { |
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44 | Throw msg; |
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45 | } |
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46 | } |
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47 | |
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48 | /* Windows open-file functions */ |
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49 | |
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50 | void PngFileInitialize (HWND hwnd) |
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51 | { |
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52 | static TCHAR szFilter[] = TEXT ("PNG Files (*.PNG)\0*.png\0") |
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53 | TEXT ("All Files (*.*)\0*.*\0\0"); |
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54 | |
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55 | ofn.lStructSize = sizeof (OPENFILENAME); |
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56 | ofn.hwndOwner = hwnd; |
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57 | ofn.hInstance = NULL; |
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58 | ofn.lpstrFilter = szFilter; |
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59 | ofn.lpstrCustomFilter = NULL; |
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60 | ofn.nMaxCustFilter = 0; |
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61 | ofn.nFilterIndex = 0; |
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62 | ofn.lpstrFile = NULL; /* Set in Open and Close functions */ |
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63 | ofn.nMaxFile = MAX_PATH; |
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64 | ofn.lpstrFileTitle = NULL; /* Set in Open and Close functions */ |
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65 | ofn.nMaxFileTitle = MAX_PATH; |
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66 | ofn.lpstrInitialDir = NULL; |
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67 | ofn.lpstrTitle = NULL; |
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68 | ofn.Flags = 0; /* Set in Open and Close functions */ |
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69 | ofn.nFileOffset = 0; |
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70 | ofn.nFileExtension = 0; |
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71 | ofn.lpstrDefExt = TEXT ("png"); |
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72 | ofn.lCustData = 0; |
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73 | ofn.lpfnHook = NULL; |
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74 | ofn.lpTemplateName = NULL; |
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75 | } |
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76 | |
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77 | BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) |
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78 | { |
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79 | ofn.hwndOwner = hwnd; |
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80 | ofn.lpstrFile = pstrFileName; |
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81 | ofn.lpstrFileTitle = pstrTitleName; |
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82 | ofn.Flags = OFN_HIDEREADONLY; |
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83 | |
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84 | return GetOpenFileName (&ofn); |
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85 | } |
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86 | |
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87 | BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) |
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88 | { |
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89 | ofn.hwndOwner = hwnd; |
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90 | ofn.lpstrFile = pstrFileName; |
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91 | ofn.lpstrFileTitle = pstrTitleName; |
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92 | ofn.Flags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT; |
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93 | |
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94 | return GetSaveFileName (&ofn); |
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95 | } |
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96 | |
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97 | /* PNG image handler functions */ |
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98 | |
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99 | BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, |
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100 | int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor) |
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101 | { |
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102 | static FILE *pfFile; |
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103 | png_byte pbSig[8]; |
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104 | int iBitDepth; |
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105 | int iColorType; |
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106 | double dGamma; |
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107 | png_color_16 *pBackground; |
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108 | png_uint_32 ulChannels; |
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109 | png_uint_32 ulRowBytes; |
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110 | png_byte *pbImageData = *ppbImageData; |
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111 | static png_byte **ppbRowPointers = NULL; |
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112 | int i; |
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113 | |
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114 | /* open the PNG input file */ |
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115 | |
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116 | if (!pstrFileName) |
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117 | { |
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118 | *ppbImageData = pbImageData = NULL; |
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119 | return FALSE; |
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120 | } |
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121 | |
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122 | if (!(pfFile = fopen(pstrFileName, "rb"))) |
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123 | { |
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124 | *ppbImageData = pbImageData = NULL; |
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125 | return FALSE; |
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126 | } |
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127 | |
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128 | /* first check the eight byte PNG signature */ |
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129 | |
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130 | fread(pbSig, 1, 8, pfFile); |
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131 | if (png_sig_cmp(pbSig, 0, 8)) |
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132 | { |
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133 | *ppbImageData = pbImageData = NULL; |
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134 | return FALSE; |
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135 | } |
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136 | |
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137 | /* create the two png(-info) structures */ |
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138 | |
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139 | png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, |
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140 | (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL); |
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141 | if (!png_ptr) |
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142 | { |
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143 | *ppbImageData = pbImageData = NULL; |
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144 | return FALSE; |
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145 | } |
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146 | |
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147 | info_ptr = png_create_info_struct(png_ptr); |
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148 | if (!info_ptr) |
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149 | { |
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150 | png_destroy_read_struct(&png_ptr, NULL, NULL); |
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151 | *ppbImageData = pbImageData = NULL; |
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152 | return FALSE; |
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153 | } |
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154 | |
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155 | Try |
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156 | { |
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157 | |
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158 | /* initialize the png structure */ |
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159 | |
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160 | #ifdef PNG_STDIO_SUPPORTED |
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161 | png_init_io(png_ptr, pfFile); |
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162 | #else |
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163 | png_set_read_fn(png_ptr, (png_voidp)pfFile, png_read_data); |
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164 | #endif |
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165 | |
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166 | png_set_sig_bytes(png_ptr, 8); |
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167 | |
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168 | /* read all PNG info up to image data */ |
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169 | |
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170 | png_read_info(png_ptr, info_ptr); |
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171 | |
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172 | /* get width, height, bit-depth and color-type */ |
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173 | |
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174 | png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth, |
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175 | &iColorType, NULL, NULL, NULL); |
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176 | |
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177 | /* expand images of all color-type and bit-depth to 3x8-bit RGB */ |
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178 | /* let the library process alpha, transparency, background, etc. */ |
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179 | |
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180 | #ifdef PNG_READ_16_TO_8_SUPPORTED |
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181 | if (iBitDepth == 16) |
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182 | # ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
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183 | png_set_scale_16(png_ptr); |
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184 | # else |
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185 | png_set_strip_16(png_ptr); |
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186 | # endif |
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187 | #endif |
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188 | if (iColorType == PNG_COLOR_TYPE_PALETTE) |
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189 | png_set_expand(png_ptr); |
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190 | if (iBitDepth < 8) |
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191 | png_set_expand(png_ptr); |
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192 | if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) |
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193 | png_set_expand(png_ptr); |
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194 | if (iColorType == PNG_COLOR_TYPE_GRAY || |
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195 | iColorType == PNG_COLOR_TYPE_GRAY_ALPHA) |
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196 | png_set_gray_to_rgb(png_ptr); |
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197 | |
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198 | /* set the background color to draw transparent and alpha images over */ |
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199 | if (png_get_bKGD(png_ptr, info_ptr, &pBackground)) |
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200 | { |
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201 | png_set_background(png_ptr, pBackground, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0); |
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202 | pBkgColor->red = (byte) pBackground->red; |
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203 | pBkgColor->green = (byte) pBackground->green; |
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204 | pBkgColor->blue = (byte) pBackground->blue; |
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205 | } |
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206 | else |
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207 | { |
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208 | pBkgColor = NULL; |
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209 | } |
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210 | |
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211 | /* if required set gamma conversion */ |
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212 | if (png_get_gAMA(png_ptr, info_ptr, &dGamma)) |
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213 | png_set_gamma(png_ptr, (double) 2.2, dGamma); |
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214 | |
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215 | /* after the transformations are registered, update info_ptr data */ |
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216 | |
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217 | png_read_update_info(png_ptr, info_ptr); |
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218 | |
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219 | /* get again width, height and the new bit-depth and color-type */ |
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220 | |
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221 | png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth, |
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222 | &iColorType, NULL, NULL, NULL); |
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223 | |
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224 | |
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225 | /* row_bytes is the width x number of channels */ |
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226 | |
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227 | ulRowBytes = png_get_rowbytes(png_ptr, info_ptr); |
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228 | ulChannels = png_get_channels(png_ptr, info_ptr); |
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229 | |
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230 | *piChannels = ulChannels; |
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231 | |
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232 | /* now we can allocate memory to store the image */ |
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233 | |
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234 | if (pbImageData) |
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235 | { |
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236 | free (pbImageData); |
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237 | pbImageData = NULL; |
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238 | } |
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239 | if ((pbImageData = (png_byte *) malloc(ulRowBytes * (*piHeight) |
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240 | * sizeof(png_byte))) == NULL) |
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241 | { |
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242 | png_error(png_ptr, "Visual PNG: out of memory"); |
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243 | } |
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244 | *ppbImageData = pbImageData; |
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245 | |
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246 | /* and allocate memory for an array of row-pointers */ |
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247 | |
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248 | if ((ppbRowPointers = (png_bytepp) malloc((*piHeight) |
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249 | * sizeof(png_bytep))) == NULL) |
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250 | { |
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251 | png_error(png_ptr, "Visual PNG: out of memory"); |
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252 | } |
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253 | |
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254 | /* set the individual row-pointers to point at the correct offsets */ |
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255 | |
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256 | for (i = 0; i < (*piHeight); i++) |
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257 | ppbRowPointers[i] = pbImageData + i * ulRowBytes; |
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258 | |
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259 | /* now we can go ahead and just read the whole image */ |
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260 | |
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261 | png_read_image(png_ptr, ppbRowPointers); |
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262 | |
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263 | /* read the additional chunks in the PNG file (not really needed) */ |
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264 | |
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265 | png_read_end(png_ptr, NULL); |
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266 | |
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267 | /* and we're done */ |
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268 | |
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269 | free (ppbRowPointers); |
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270 | ppbRowPointers = NULL; |
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271 | |
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272 | /* yepp, done */ |
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273 | } |
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274 | |
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275 | Catch (msg) |
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276 | { |
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277 | png_destroy_read_struct(&png_ptr, &info_ptr, NULL); |
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278 | |
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279 | *ppbImageData = pbImageData = NULL; |
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280 | |
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281 | if(ppbRowPointers) |
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282 | free (ppbRowPointers); |
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283 | |
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284 | fclose(pfFile); |
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285 | |
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286 | return FALSE; |
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287 | } |
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288 | |
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289 | fclose (pfFile); |
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290 | |
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291 | return TRUE; |
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292 | } |
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293 | |
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294 | |
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295 | BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData, |
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296 | int iWidth, int iHeight, png_color bkgColor) |
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297 | { |
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298 | const int ciBitDepth = 8; |
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299 | const int ciChannels = 3; |
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300 | |
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301 | static FILE *pfFile; |
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302 | png_uint_32 ulRowBytes; |
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303 | static png_byte **ppbRowPointers = NULL; |
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304 | int i; |
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305 | |
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306 | /* open the PNG output file */ |
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307 | |
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308 | if (!pstrFileName) |
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309 | return FALSE; |
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310 | |
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311 | if (!(pfFile = fopen(pstrFileName, "wb"))) |
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312 | return FALSE; |
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313 | |
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314 | /* prepare the standard PNG structures */ |
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315 | |
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316 | png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, |
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317 | (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL); |
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318 | if (!png_ptr) |
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319 | { |
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320 | fclose(pfFile); |
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321 | return FALSE; |
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322 | } |
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323 | |
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324 | info_ptr = png_create_info_struct(png_ptr); |
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325 | if (!info_ptr) { |
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326 | fclose(pfFile); |
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327 | png_destroy_write_struct(&png_ptr, (png_infopp) NULL); |
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328 | return FALSE; |
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329 | } |
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330 | |
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331 | Try |
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332 | { |
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333 | /* initialize the png structure */ |
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334 | |
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335 | #ifdef PNG_STDIO_SUPPORTED |
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336 | png_init_io(png_ptr, pfFile); |
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337 | #else |
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338 | png_set_write_fn(png_ptr, (png_voidp)pfFile, png_write_data, png_flush); |
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339 | #endif |
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340 | |
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341 | /* we're going to write a very simple 3x8-bit RGB image */ |
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342 | |
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343 | png_set_IHDR(png_ptr, info_ptr, iWidth, iHeight, ciBitDepth, |
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344 | PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, |
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345 | PNG_FILTER_TYPE_BASE); |
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346 | |
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347 | /* write the file header information */ |
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348 | |
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349 | png_write_info(png_ptr, info_ptr); |
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350 | |
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351 | /* swap the BGR pixels in the DiData structure to RGB */ |
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352 | |
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353 | png_set_bgr(png_ptr); |
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354 | |
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355 | /* row_bytes is the width x number of channels */ |
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356 | |
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357 | ulRowBytes = iWidth * ciChannels; |
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358 | |
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359 | /* we can allocate memory for an array of row-pointers */ |
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360 | |
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361 | if ((ppbRowPointers = (png_bytepp) malloc(iHeight * sizeof(png_bytep))) == NULL) |
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362 | Throw "Visualpng: Out of memory"; |
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363 | |
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364 | /* set the individual row-pointers to point at the correct offsets */ |
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365 | |
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366 | for (i = 0; i < iHeight; i++) |
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367 | ppbRowPointers[i] = pDiData + i * (((ulRowBytes + 3) >> 2) << 2); |
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368 | |
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369 | /* write out the entire image data in one call */ |
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370 | |
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371 | png_write_image (png_ptr, ppbRowPointers); |
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372 | |
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373 | /* write the additional chunks to the PNG file (not really needed) */ |
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374 | |
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375 | png_write_end(png_ptr, info_ptr); |
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376 | |
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377 | /* and we're done */ |
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378 | |
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379 | free (ppbRowPointers); |
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380 | ppbRowPointers = NULL; |
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381 | |
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382 | /* clean up after the write, and free any memory allocated */ |
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383 | |
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384 | png_destroy_write_struct(&png_ptr, (png_infopp) NULL); |
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385 | |
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386 | /* yepp, done */ |
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387 | } |
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388 | |
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389 | Catch (msg) |
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390 | { |
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391 | png_destroy_write_struct(&png_ptr, (png_infopp) NULL); |
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392 | |
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393 | if(ppbRowPointers) |
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394 | free (ppbRowPointers); |
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395 | |
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396 | fclose(pfFile); |
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397 | |
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398 | return FALSE; |
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399 | } |
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400 | |
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401 | fclose (pfFile); |
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402 | |
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403 | return TRUE; |
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404 | } |
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405 | |
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406 | #ifndef PNG_STDIO_SUPPORTED |
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407 | |
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408 | static void |
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409 | png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) |
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410 | { |
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411 | png_size_t check; |
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412 | |
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413 | /* fread() returns 0 on error, so it is OK to store this in a png_size_t |
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414 | * instead of an int, which is what fread() actually returns. |
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415 | */ |
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416 | check = (png_size_t)fread(data, (png_size_t)1, length, |
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417 | (FILE *)png_ptr->io_ptr); |
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418 | |
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419 | if (check != length) |
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420 | { |
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421 | png_error(png_ptr, "Read Error"); |
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422 | } |
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423 | } |
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424 | |
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425 | static void |
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426 | png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) |
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427 | { |
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428 | png_uint_32 check; |
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429 | |
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430 | check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr)); |
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431 | if (check != length) |
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432 | { |
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433 | png_error(png_ptr, "Write Error"); |
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434 | } |
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435 | } |
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436 | |
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437 | static void |
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438 | png_flush(png_structp png_ptr) |
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439 | { |
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440 | FILE *io_ptr; |
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441 | io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr)); |
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442 | if (io_ptr != NULL) |
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443 | fflush(io_ptr); |
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444 | } |
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445 | |
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446 | #endif |
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447 | |
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448 | /*----------------- |
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449 | * end of source |
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450 | *----------------- |
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451 | */ |
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