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Rev | Author | Line No. | Line |
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96 | giacomo | 1 | |
2 | /* pngwtran.c - transforms the data in a row for PNG writers |
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3 | * |
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4 | * libpng 1.2.5 - October 3, 2002 |
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5 | * For conditions of distribution and use, see copyright notice in png.h |
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6 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
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7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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9 | */ |
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10 | |||
11 | #define PNG_INTERNAL |
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12 | #include "png.h" |
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13 | #ifdef PNG_WRITE_SUPPORTED |
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14 | |||
15 | /* Transform the data according to the user's wishes. The order of |
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16 | * transformations is significant. |
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17 | */ |
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18 | void /* PRIVATE */ |
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19 | png_do_write_transformations(png_structp png_ptr) |
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20 | { |
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21 | png_debug(1, "in png_do_write_transformations\n"); |
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22 | |||
23 | if (png_ptr == NULL) |
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24 | return; |
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25 | |||
26 | #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
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27 | if (png_ptr->transformations & PNG_USER_TRANSFORM) |
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28 | if(png_ptr->write_user_transform_fn != NULL) |
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29 | (*(png_ptr->write_user_transform_fn)) /* user write transform function */ |
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30 | (png_ptr, /* png_ptr */ |
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31 | &(png_ptr->row_info), /* row_info: */ |
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32 | /* png_uint_32 width; width of row */ |
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33 | /* png_uint_32 rowbytes; number of bytes in row */ |
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34 | /* png_byte color_type; color type of pixels */ |
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35 | /* png_byte bit_depth; bit depth of samples */ |
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36 | /* png_byte channels; number of channels (1-4) */ |
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37 | /* png_byte pixel_depth; bits per pixel (depth*channels) */ |
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38 | png_ptr->row_buf + 1); /* start of pixel data for row */ |
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39 | #endif |
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40 | #if defined(PNG_WRITE_FILLER_SUPPORTED) |
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41 | if (png_ptr->transformations & PNG_FILLER) |
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42 | png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, |
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43 | png_ptr->flags); |
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44 | #endif |
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45 | #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
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46 | if (png_ptr->transformations & PNG_PACKSWAP) |
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47 | png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); |
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48 | #endif |
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49 | #if defined(PNG_WRITE_PACK_SUPPORTED) |
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50 | if (png_ptr->transformations & PNG_PACK) |
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51 | png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, |
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52 | (png_uint_32)png_ptr->bit_depth); |
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53 | #endif |
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54 | #if defined(PNG_WRITE_SWAP_SUPPORTED) |
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55 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
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56 | png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); |
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57 | #endif |
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58 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
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59 | if (png_ptr->transformations & PNG_SHIFT) |
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60 | png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, |
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61 | &(png_ptr->shift)); |
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62 | #endif |
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63 | #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
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64 | if (png_ptr->transformations & PNG_INVERT_ALPHA) |
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65 | png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); |
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66 | #endif |
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67 | #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
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68 | if (png_ptr->transformations & PNG_SWAP_ALPHA) |
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69 | png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); |
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70 | #endif |
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71 | #if defined(PNG_WRITE_BGR_SUPPORTED) |
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72 | if (png_ptr->transformations & PNG_BGR) |
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73 | png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); |
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74 | #endif |
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75 | #if defined(PNG_WRITE_INVERT_SUPPORTED) |
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76 | if (png_ptr->transformations & PNG_INVERT_MONO) |
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77 | png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); |
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78 | #endif |
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79 | } |
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80 | |||
81 | #if defined(PNG_WRITE_PACK_SUPPORTED) |
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82 | /* Pack pixels into bytes. Pass the true bit depth in bit_depth. The |
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83 | * row_info bit depth should be 8 (one pixel per byte). The channels |
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84 | * should be 1 (this only happens on grayscale and paletted images). |
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85 | */ |
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86 | void /* PRIVATE */ |
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87 | png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) |
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88 | { |
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89 | png_debug(1, "in png_do_pack\n"); |
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90 | if (row_info->bit_depth == 8 && |
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91 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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92 | row != NULL && row_info != NULL && |
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93 | #endif |
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94 | row_info->channels == 1) |
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95 | { |
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96 | switch ((int)bit_depth) |
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97 | { |
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98 | case 1: |
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99 | { |
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100 | png_bytep sp, dp; |
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101 | int mask, v; |
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102 | png_uint_32 i; |
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103 | png_uint_32 row_width = row_info->width; |
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104 | |||
105 | sp = row; |
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106 | dp = row; |
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107 | mask = 0x80; |
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108 | v = 0; |
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109 | |||
110 | for (i = 0; i < row_width; i++) |
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111 | { |
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112 | if (*sp != 0) |
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113 | v |= mask; |
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114 | sp++; |
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115 | if (mask > 1) |
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116 | mask >>= 1; |
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117 | else |
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118 | { |
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119 | mask = 0x80; |
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120 | *dp = (png_byte)v; |
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121 | dp++; |
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122 | v = 0; |
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123 | } |
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124 | } |
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125 | if (mask != 0x80) |
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126 | *dp = (png_byte)v; |
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127 | break; |
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128 | } |
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129 | case 2: |
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130 | { |
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131 | png_bytep sp, dp; |
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132 | int shift, v; |
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133 | png_uint_32 i; |
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134 | png_uint_32 row_width = row_info->width; |
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135 | |||
136 | sp = row; |
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137 | dp = row; |
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138 | shift = 6; |
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139 | v = 0; |
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140 | for (i = 0; i < row_width; i++) |
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141 | { |
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142 | png_byte value; |
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143 | |||
144 | value = (png_byte)(*sp & 0x03); |
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145 | v |= (value << shift); |
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146 | if (shift == 0) |
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147 | { |
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148 | shift = 6; |
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149 | *dp = (png_byte)v; |
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150 | dp++; |
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151 | v = 0; |
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152 | } |
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153 | else |
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154 | shift -= 2; |
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155 | sp++; |
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156 | } |
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157 | if (shift != 6) |
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158 | *dp = (png_byte)v; |
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159 | break; |
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160 | } |
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161 | case 4: |
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162 | { |
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163 | png_bytep sp, dp; |
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164 | int shift, v; |
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165 | png_uint_32 i; |
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166 | png_uint_32 row_width = row_info->width; |
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167 | |||
168 | sp = row; |
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169 | dp = row; |
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170 | shift = 4; |
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171 | v = 0; |
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172 | for (i = 0; i < row_width; i++) |
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173 | { |
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174 | png_byte value; |
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175 | |||
176 | value = (png_byte)(*sp & 0x0f); |
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177 | v |= (value << shift); |
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178 | |||
179 | if (shift == 0) |
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180 | { |
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181 | shift = 4; |
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182 | *dp = (png_byte)v; |
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183 | dp++; |
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184 | v = 0; |
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185 | } |
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186 | else |
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187 | shift -= 4; |
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188 | |||
189 | sp++; |
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190 | } |
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191 | if (shift != 4) |
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192 | *dp = (png_byte)v; |
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193 | break; |
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194 | } |
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195 | } |
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196 | row_info->bit_depth = (png_byte)bit_depth; |
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197 | row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); |
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198 | row_info->rowbytes = |
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199 | ((row_info->width * row_info->pixel_depth + 7) >> 3); |
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200 | } |
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201 | } |
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202 | #endif |
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203 | |||
204 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
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205 | /* Shift pixel values to take advantage of whole range. Pass the |
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206 | * true number of bits in bit_depth. The row should be packed |
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207 | * according to row_info->bit_depth. Thus, if you had a row of |
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208 | * bit depth 4, but the pixels only had values from 0 to 7, you |
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209 | * would pass 3 as bit_depth, and this routine would translate the |
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210 | * data to 0 to 15. |
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211 | */ |
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212 | void /* PRIVATE */ |
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213 | png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) |
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214 | { |
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215 | png_debug(1, "in png_do_shift\n"); |
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216 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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217 | if (row != NULL && row_info != NULL && |
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218 | #else |
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219 | if ( |
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220 | #endif |
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221 | row_info->color_type != PNG_COLOR_TYPE_PALETTE) |
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222 | { |
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223 | int shift_start[4], shift_dec[4]; |
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224 | int channels = 0; |
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225 | |||
226 | if (row_info->color_type & PNG_COLOR_MASK_COLOR) |
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227 | { |
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228 | shift_start[channels] = row_info->bit_depth - bit_depth->red; |
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229 | shift_dec[channels] = bit_depth->red; |
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230 | channels++; |
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231 | shift_start[channels] = row_info->bit_depth - bit_depth->green; |
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232 | shift_dec[channels] = bit_depth->green; |
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233 | channels++; |
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234 | shift_start[channels] = row_info->bit_depth - bit_depth->blue; |
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235 | shift_dec[channels] = bit_depth->blue; |
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236 | channels++; |
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237 | } |
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238 | else |
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239 | { |
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240 | shift_start[channels] = row_info->bit_depth - bit_depth->gray; |
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241 | shift_dec[channels] = bit_depth->gray; |
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242 | channels++; |
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243 | } |
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244 | if (row_info->color_type & PNG_COLOR_MASK_ALPHA) |
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245 | { |
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246 | shift_start[channels] = row_info->bit_depth - bit_depth->alpha; |
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247 | shift_dec[channels] = bit_depth->alpha; |
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248 | channels++; |
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249 | } |
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250 | |||
251 | /* with low row depths, could only be grayscale, so one channel */ |
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252 | if (row_info->bit_depth < 8) |
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253 | { |
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254 | png_bytep bp = row; |
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255 | png_uint_32 i; |
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256 | png_byte mask; |
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257 | png_uint_32 row_bytes = row_info->rowbytes; |
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258 | |||
259 | if (bit_depth->gray == 1 && row_info->bit_depth == 2) |
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260 | mask = 0x55; |
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261 | else if (row_info->bit_depth == 4 && bit_depth->gray == 3) |
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262 | mask = 0x11; |
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263 | else |
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264 | mask = 0xff; |
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265 | |||
266 | for (i = 0; i < row_bytes; i++, bp++) |
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267 | { |
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268 | png_uint_16 v; |
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269 | int j; |
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270 | |||
271 | v = *bp; |
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272 | *bp = 0; |
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273 | for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) |
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274 | { |
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275 | if (j > 0) |
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276 | *bp |= (png_byte)((v << j) & 0xff); |
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277 | else |
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278 | *bp |= (png_byte)((v >> (-j)) & mask); |
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279 | } |
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280 | } |
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281 | } |
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282 | else if (row_info->bit_depth == 8) |
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283 | { |
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284 | png_bytep bp = row; |
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285 | png_uint_32 i; |
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286 | png_uint_32 istop = channels * row_info->width; |
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287 | |||
288 | for (i = 0; i < istop; i++, bp++) |
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289 | { |
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290 | |||
291 | png_uint_16 v; |
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292 | int j; |
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293 | int c = (int)(i%channels); |
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294 | |||
295 | v = *bp; |
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296 | *bp = 0; |
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297 | for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) |
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298 | { |
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299 | if (j > 0) |
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300 | *bp |= (png_byte)((v << j) & 0xff); |
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301 | else |
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302 | *bp |= (png_byte)((v >> (-j)) & 0xff); |
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303 | } |
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304 | } |
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305 | } |
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306 | else |
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307 | { |
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308 | png_bytep bp; |
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309 | png_uint_32 i; |
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310 | png_uint_32 istop = channels * row_info->width; |
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311 | |||
312 | for (bp = row, i = 0; i < istop; i++) |
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313 | { |
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314 | int c = (int)(i%channels); |
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315 | png_uint_16 value, v; |
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316 | int j; |
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317 | |||
318 | v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); |
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319 | value = 0; |
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320 | for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) |
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321 | { |
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322 | if (j > 0) |
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323 | value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); |
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324 | else |
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325 | value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); |
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326 | } |
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327 | *bp++ = (png_byte)(value >> 8); |
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328 | *bp++ = (png_byte)(value & 0xff); |
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329 | } |
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330 | } |
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331 | } |
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332 | } |
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333 | #endif |
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334 | |||
335 | #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
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336 | void /* PRIVATE */ |
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337 | png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) |
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338 | { |
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339 | png_debug(1, "in png_do_write_swap_alpha\n"); |
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340 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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341 | if (row != NULL && row_info != NULL) |
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342 | #endif |
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343 | { |
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344 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
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345 | { |
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346 | /* This converts from ARGB to RGBA */ |
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347 | if (row_info->bit_depth == 8) |
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348 | { |
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349 | png_bytep sp, dp; |
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350 | png_uint_32 i; |
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351 | png_uint_32 row_width = row_info->width; |
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352 | for (i = 0, sp = dp = row; i < row_width; i++) |
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353 | { |
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354 | png_byte save = *(sp++); |
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355 | *(dp++) = *(sp++); |
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356 | *(dp++) = *(sp++); |
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357 | *(dp++) = *(sp++); |
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358 | *(dp++) = save; |
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359 | } |
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360 | } |
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361 | /* This converts from AARRGGBB to RRGGBBAA */ |
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362 | else |
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363 | { |
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364 | png_bytep sp, dp; |
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365 | png_uint_32 i; |
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366 | png_uint_32 row_width = row_info->width; |
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367 | |||
368 | for (i = 0, sp = dp = row; i < row_width; i++) |
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369 | { |
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370 | png_byte save[2]; |
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371 | save[0] = *(sp++); |
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372 | save[1] = *(sp++); |
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373 | *(dp++) = *(sp++); |
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374 | *(dp++) = *(sp++); |
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375 | *(dp++) = *(sp++); |
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376 | *(dp++) = *(sp++); |
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377 | *(dp++) = *(sp++); |
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378 | *(dp++) = *(sp++); |
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379 | *(dp++) = save[0]; |
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380 | *(dp++) = save[1]; |
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381 | } |
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382 | } |
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383 | } |
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384 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
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385 | { |
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386 | /* This converts from AG to GA */ |
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387 | if (row_info->bit_depth == 8) |
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388 | { |
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389 | png_bytep sp, dp; |
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390 | png_uint_32 i; |
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391 | png_uint_32 row_width = row_info->width; |
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392 | |||
393 | for (i = 0, sp = dp = row; i < row_width; i++) |
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394 | { |
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395 | png_byte save = *(sp++); |
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396 | *(dp++) = *(sp++); |
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397 | *(dp++) = save; |
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398 | } |
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399 | } |
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400 | /* This converts from AAGG to GGAA */ |
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401 | else |
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402 | { |
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403 | png_bytep sp, dp; |
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404 | png_uint_32 i; |
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405 | png_uint_32 row_width = row_info->width; |
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406 | |||
407 | for (i = 0, sp = dp = row; i < row_width; i++) |
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408 | { |
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409 | png_byte save[2]; |
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410 | save[0] = *(sp++); |
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411 | save[1] = *(sp++); |
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412 | *(dp++) = *(sp++); |
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413 | *(dp++) = *(sp++); |
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414 | *(dp++) = save[0]; |
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415 | *(dp++) = save[1]; |
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416 | } |
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417 | } |
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418 | } |
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419 | } |
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420 | } |
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421 | #endif |
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422 | |||
423 | #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
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424 | void /* PRIVATE */ |
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425 | png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) |
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426 | { |
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427 | png_debug(1, "in png_do_write_invert_alpha\n"); |
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428 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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429 | if (row != NULL && row_info != NULL) |
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430 | #endif |
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431 | { |
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432 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
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433 | { |
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434 | /* This inverts the alpha channel in RGBA */ |
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435 | if (row_info->bit_depth == 8) |
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436 | { |
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437 | png_bytep sp, dp; |
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438 | png_uint_32 i; |
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439 | png_uint_32 row_width = row_info->width; |
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440 | for (i = 0, sp = dp = row; i < row_width; i++) |
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441 | { |
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442 | *(dp++) = *(sp++); |
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443 | *(dp++) = *(sp++); |
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444 | *(dp++) = *(sp++); |
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445 | *(dp++) = (png_byte)(255 - *(sp++)); |
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446 | } |
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447 | } |
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448 | /* This inverts the alpha channel in RRGGBBAA */ |
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449 | else |
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450 | { |
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451 | png_bytep sp, dp; |
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452 | png_uint_32 i; |
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453 | png_uint_32 row_width = row_info->width; |
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454 | |||
455 | for (i = 0, sp = dp = row; i < row_width; i++) |
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456 | { |
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457 | *(dp++) = *(sp++); |
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458 | *(dp++) = *(sp++); |
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459 | *(dp++) = *(sp++); |
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460 | *(dp++) = *(sp++); |
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461 | *(dp++) = *(sp++); |
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462 | *(dp++) = *(sp++); |
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463 | *(dp++) = (png_byte)(255 - *(sp++)); |
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464 | *(dp++) = (png_byte)(255 - *(sp++)); |
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465 | } |
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466 | } |
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467 | } |
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468 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
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469 | { |
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470 | /* This inverts the alpha channel in GA */ |
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471 | if (row_info->bit_depth == 8) |
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472 | { |
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473 | png_bytep sp, dp; |
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474 | png_uint_32 i; |
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475 | png_uint_32 row_width = row_info->width; |
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476 | |||
477 | for (i = 0, sp = dp = row; i < row_width; i++) |
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478 | { |
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479 | *(dp++) = *(sp++); |
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480 | *(dp++) = (png_byte)(255 - *(sp++)); |
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481 | } |
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482 | } |
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483 | /* This inverts the alpha channel in GGAA */ |
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484 | else |
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485 | { |
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486 | png_bytep sp, dp; |
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487 | png_uint_32 i; |
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488 | png_uint_32 row_width = row_info->width; |
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489 | |||
490 | for (i = 0, sp = dp = row; i < row_width; i++) |
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491 | { |
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492 | *(dp++) = *(sp++); |
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493 | *(dp++) = *(sp++); |
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494 | *(dp++) = (png_byte)(255 - *(sp++)); |
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495 | *(dp++) = (png_byte)(255 - *(sp++)); |
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496 | } |
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497 | } |
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498 | } |
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499 | } |
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500 | } |
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501 | #endif |
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502 | |||
503 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
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504 | /* undoes intrapixel differencing */ |
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505 | void /* PRIVATE */ |
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506 | png_do_write_intrapixel(png_row_infop row_info, png_bytep row) |
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507 | { |
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508 | png_debug(1, "in png_do_write_intrapixel\n"); |
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509 | if ( |
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510 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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511 | row != NULL && row_info != NULL && |
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512 | #endif |
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513 | (row_info->color_type & PNG_COLOR_MASK_COLOR)) |
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514 | { |
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515 | int bytes_per_pixel; |
||
516 | png_uint_32 row_width = row_info->width; |
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517 | if (row_info->bit_depth == 8) |
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518 | { |
||
519 | png_bytep rp; |
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520 | png_uint_32 i; |
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521 | |||
522 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
523 | bytes_per_pixel = 3; |
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524 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
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525 | bytes_per_pixel = 4; |
||
526 | else |
||
527 | return; |
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528 | |||
529 | for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) |
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530 | { |
||
531 | *(rp) = (png_byte)((*rp - *(rp+1))&0xff); |
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532 | *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff); |
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533 | } |
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534 | } |
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535 | else if (row_info->bit_depth == 16) |
||
536 | { |
||
537 | png_bytep rp; |
||
538 | png_uint_32 i; |
||
539 | |||
540 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
541 | bytes_per_pixel = 6; |
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542 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
||
543 | bytes_per_pixel = 8; |
||
544 | else |
||
545 | return; |
||
546 | |||
547 | for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) |
||
548 | { |
||
549 | png_uint_32 s0=*(rp )<<8 | *(rp+1); |
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550 | png_uint_32 s1=*(rp+2)<<8 | *(rp+3); |
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551 | png_uint_32 s2=*(rp+4)<<8 | *(rp+5); |
||
552 | png_uint_32 red=(s0-s1)&0xffff; |
||
553 | png_uint_32 blue=(s2-s1)&0xffff; |
||
554 | *(rp ) = (png_byte)((red>>8)&0xff); |
||
555 | *(rp+1) = (png_byte)(red&0xff); |
||
556 | *(rp+4) = (png_byte)((blue>>8)&0xff); |
||
557 | *(rp+5) = (png_byte)(blue&0xff); |
||
558 | } |
||
559 | } |
||
560 | } |
||
561 | } |
||
562 | #endif /* PNG_MNG_FEATURES_SUPPORTED */ |
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563 | #endif /* PNG_WRITE_SUPPORTED */ |