Mercurial > repos > blastem
annotate png.c @ 2166:3a6680e9204a
xcftools is no longer packaged by Debian/Ubuntu so switched to imagemagick
author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 23 Jul 2022 10:54:07 -0700 |
parents | 81eebbe6b2e3 |
children | eb45ad9d8a3f |
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1 #include <stdint.h> |
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2 #include <stdlib.h> |
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3 #include <stdio.h> |
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4 #include <string.h> |
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5 #include "zlib/zlib.h" |
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6 |
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7 static const char png_magic[] = {0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n'}; |
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8 static const char ihdr[] = {'I', 'H', 'D', 'R'}; |
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9 static const char plte[] = {'P', 'L', 'T', 'E'}; |
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10 static const char idat[] = {'I', 'D', 'A', 'T'}; |
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11 static const char iend[] = {'I', 'E', 'N', 'D'}; |
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12 |
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13 enum { |
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14 COLOR_GRAY, |
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15 COLOR_TRUE = 2, |
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16 COLOR_INDEXED, |
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17 COLOR_GRAY_ALPHA, |
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18 COLOR_TRUE_ALPHA=6 |
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19 }; |
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20 |
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21 static void write_chunk(FILE *f, const char*id, uint8_t *buffer, uint32_t size) |
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22 { |
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23 uint8_t tmp[4] = {size >> 24, size >> 16, size >> 8, size}; |
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24 uint8_t warn = 0; |
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25 warn = warn || (sizeof(tmp) != fwrite(tmp, 1, sizeof(tmp), f)); |
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26 warn = warn || (4 != fwrite(id, 1, 4, f)); |
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27 if (size) { |
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28 warn = warn || (size != fwrite(buffer, 1, size, f)); |
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29 } |
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30 |
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31 uint32_t crc = crc32(0, NULL, 0); |
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32 crc = crc32(crc, id, 4); |
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33 if (size) { |
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34 crc = crc32(crc, buffer, size); |
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35 } |
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36 tmp[0] = crc >> 24; |
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37 tmp[1] = crc >> 16; |
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38 tmp[2] = crc >> 8; |
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39 tmp[3] = crc; |
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40 warn = warn || (sizeof(tmp) != fwrite(tmp, 1, sizeof(tmp), f)); |
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41 if (warn) { |
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42 fprintf(stderr, "Failure during write of %c%c%c%c chunk\n", id[0], id[1], id[2], id[3]); |
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43 } |
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44 } |
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45 |
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46 static void write_header(FILE *f, uint32_t width, uint32_t height, uint8_t color_type) |
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47 { |
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48 uint8_t chunk[13] = { |
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49 width >> 24, width >> 16, width >> 8, width, |
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50 height >> 24, height >> 16, height >> 8, height, |
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51 8, color_type, 0, 0, 0 |
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52 }; |
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53 if (sizeof(png_magic) != fwrite(png_magic, 1, sizeof(png_magic), f)) { |
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54 fputs("Error writing PNG magic\n", stderr); |
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55 } |
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56 write_chunk(f, ihdr, chunk, sizeof(chunk)); |
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57 } |
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58 |
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59 void save_png24(FILE *f, uint32_t *buffer, uint32_t width, uint32_t height, uint32_t pitch) |
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60 { |
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61 uint32_t idat_size = (1 + width*3) * height; |
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62 uint8_t *idat_buffer = malloc(idat_size); |
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63 uint32_t *pixel = buffer; |
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64 uint8_t *cur = idat_buffer; |
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65 for (uint32_t y = 0; y < height; y++) |
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66 { |
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67 //save filter type |
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68 *(cur++) = 0; |
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69 uint32_t *start = pixel; |
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70 for (uint32_t x = 0; x < width; x++, pixel++) |
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71 { |
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72 uint32_t value = *pixel; |
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73 *(cur++) = value >> 16; |
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74 *(cur++) = value >> 8; |
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75 *(cur++) = value; |
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76 } |
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77 pixel = start + pitch / sizeof(uint32_t); |
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78 } |
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79 write_header(f, width, height, COLOR_TRUE); |
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80 uLongf compress_buffer_size = idat_size + 5 * (idat_size/16383 + 1) + 3; |
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81 uint8_t *compressed = malloc(compress_buffer_size); |
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82 compress(compressed, &compress_buffer_size, idat_buffer, idat_size); |
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83 free(idat_buffer); |
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84 write_chunk(f, idat, compressed, compress_buffer_size); |
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85 write_chunk(f, iend, NULL, 0); |
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86 free(compressed); |
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87 } |
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88 |
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89 void save_png(FILE *f, uint32_t *buffer, uint32_t width, uint32_t height, uint32_t pitch) |
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90 { |
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91 uint32_t palette[256]; |
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92 uint8_t pal_buffer[256*3]; |
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93 uint32_t num_pal = 0; |
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94 uint32_t index_size = (1 + width) * height; |
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95 uint8_t *index_buffer = malloc(index_size); |
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96 uint8_t *cur = index_buffer; |
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97 uint32_t *pixel = buffer; |
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98 for (uint32_t y = 0; y < height; y++) |
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99 { |
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100 //save filter type |
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101 *(cur++) = 0; |
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102 uint32_t *start = pixel; |
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103 for (uint32_t x = 0; x < width; x++, pixel++, cur++) |
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104 { |
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105 uint32_t value = (*pixel) & 0xFFFFFF; |
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106 uint32_t i; |
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107 for (i = 0; i < num_pal; i++) |
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108 { |
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109 if (palette[i] == value) { |
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110 break; |
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111 } |
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112 } |
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113 if (i == num_pal) { |
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114 if (num_pal == 256) { |
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115 free(index_buffer); |
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116 save_png24(f, buffer, width, height, pitch); |
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117 return; |
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118 } |
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119 palette[i] = value; |
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120 num_pal++; |
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121 } |
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122 *cur = i; |
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123 } |
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124 pixel = start + pitch / sizeof(uint32_t); |
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125 } |
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126 write_header(f, width, height, COLOR_INDEXED); |
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127 cur = pal_buffer; |
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128 for (uint32_t i = 0; i < num_pal; i++) |
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129 { |
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130 *(cur++) = palette[i] >> 16; |
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131 *(cur++) = palette[i] >> 8; |
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132 *(cur++) = palette[i]; |
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133 } |
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134 write_chunk(f, plte, pal_buffer, num_pal * 3); |
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135 uLongf compress_buffer_size = index_size + 5 * (index_size/16383 + 1) + 3; |
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136 uint8_t *compressed = malloc(compress_buffer_size); |
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137 compress(compressed, &compress_buffer_size, index_buffer, index_size); |
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138 free(index_buffer); |
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139 write_chunk(f, idat, compressed, compress_buffer_size); |
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140 write_chunk(f, iend, NULL, 0); |
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141 free(compressed); |
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142 } |
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143 |
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144 typedef uint8_t (*filter_fun)(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x); |
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145 typedef uint32_t (*pixel_fun)(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun); |
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146 |
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147 static uint8_t filter_none(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x) |
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148 { |
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149 return *cur; |
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150 } |
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151 |
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152 static uint8_t filter_sub(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x) |
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153 { |
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154 if (x) { |
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155 return *cur + *(cur - bpp); |
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156 } else { |
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157 return *cur; |
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158 } |
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159 } |
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160 |
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161 static uint8_t filter_up(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x) |
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162 { |
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163 if (last) { |
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164 return *cur + *last; |
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165 } else { |
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166 return *cur; |
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167 } |
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168 } |
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169 |
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170 static uint8_t filter_avg(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x) |
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171 { |
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172 uint8_t prev = x ? *(cur - bpp) : 0; |
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173 uint8_t prior = last ? *last : 0; |
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174 return *cur + ((prev + prior) >> 1); |
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175 } |
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176 |
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177 static uint8_t paeth(uint8_t a, uint8_t b, uint8_t c) |
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178 { |
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179 int32_t p = a + b - c; |
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180 int32_t pa = abs(p - a); |
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181 int32_t pb = abs(p - b); |
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182 int32_t pc = abs(p - c); |
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183 if (pa <= pb && pa <= pc) { |
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184 return a; |
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185 } |
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186 if (pb <= pc) { |
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187 return b; |
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188 } |
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189 return c; |
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190 } |
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191 |
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192 static uint8_t filter_paeth(uint8_t *cur, uint8_t *last, uint8_t bpp, uint32_t x) |
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193 { |
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194 uint8_t prev, prev_prior; |
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195 if (x) { |
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196 prev = *(cur - bpp); |
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197 prev_prior = *(last - bpp); |
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198 } else { |
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199 prev = prev_prior = 0; |
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200 } |
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201 uint8_t prior = last ? *last : 0; |
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202 return *cur + paeth(prev, prior, prev_prior); |
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203 } |
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204 |
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205 static uint32_t pixel_gray(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun filter) |
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206 { |
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207 uint8_t value = **cur = filter(*cur, *last, bpp, x); |
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208 (*cur)++; |
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209 if (*last) { |
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210 (*last)++; |
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211 } |
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212 return 0xFF000000 | value << 16 | value << 8 | value; |
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213 } |
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214 |
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215 static uint32_t pixel_true(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun filter) |
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216 { |
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217 uint8_t red = **cur = filter(*cur, *last, bpp, x); |
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218 (*cur)++; |
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219 if (*last) { |
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220 (*last)++; |
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221 } |
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222 uint8_t green = **cur = filter(*cur, *last, bpp, x); |
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223 (*cur)++; |
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224 if (*last) { |
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225 (*last)++; |
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226 } |
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227 uint8_t blue = **cur = filter(*cur, *last, bpp, x); |
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228 (*cur)++; |
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229 if (*last) { |
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230 (*last)++; |
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231 } |
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232 return 0xFF000000 | red << 16 | green << 8 | blue; |
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233 } |
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234 |
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235 static uint32_t pixel_gray_alpha(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun filter) |
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236 { |
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237 uint8_t value = **cur = filter(*cur, *last, bpp, x); |
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238 (*cur)++; |
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239 if (*last) { |
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240 (*last)++; |
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241 } |
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242 uint8_t alpha = **cur = filter(*cur, *last, bpp, x); |
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243 (*cur)++; |
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244 if (*last) { |
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245 (*last)++; |
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246 } |
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247 return alpha << 24 | value << 16 | value << 8 | value; |
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248 } |
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249 |
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250 static uint32_t pixel_true_alpha(uint8_t **cur, uint8_t **last, uint8_t bpp, uint32_t x, filter_fun filter) |
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251 { |
2019
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252 uint8_t red = **cur = filter(*cur, *last, bpp, x); |
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253 (*cur)++; |
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254 if (*last) { |
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255 (*last)++; |
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256 } |
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257 uint8_t green = **cur = filter(*cur, *last, bpp, x); |
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258 (*cur)++; |
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259 if (*last) { |
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260 (*last)++; |
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261 } |
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262 uint8_t blue = **cur = filter(*cur, *last, bpp, x); |
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263 (*cur)++; |
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264 if (*last) { |
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265 (*last)++; |
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266 } |
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267 uint8_t alpha = **cur = filter(*cur, *last, bpp, x); |
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268 (*cur)++; |
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269 if (*last) { |
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270 (*last)++; |
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271 } |
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272 return alpha << 24 | red << 16 | green << 8 | blue; |
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273 } |
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274 |
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275 static filter_fun filters[] = {filter_none, filter_sub, filter_up, filter_avg, filter_paeth}; |
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276 |
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277 #define MIN_CHUNK_SIZE 12 |
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278 #define MIN_IHDR_SIZE 0xD |
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279 #define MAX_SUPPORTED_DIM 32767 //chosen to avoid possibility of overflow when calculating uncompressed size |
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280 uint32_t *load_png(uint8_t *buffer, uint32_t buf_size, uint32_t *width, uint32_t *height) |
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281 { |
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282 if (buf_size < sizeof(png_magic) || memcmp(buffer, png_magic, sizeof(png_magic))) { |
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283 return NULL; |
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284 } |
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285 uint32_t cur = sizeof(png_magic); |
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286 uint8_t has_header = 0; |
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287 uint8_t bits, color_type, comp_type, filter_type, interlace; |
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288 uint8_t *idat_buf = NULL; |
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289 uint8_t idat_needs_free = 0; |
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290 uint32_t idat_size; |
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291 uint32_t *out = NULL; |
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292 uint32_t *palette = NULL; |
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293 while(cur + MIN_CHUNK_SIZE <= buf_size) |
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294 { |
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295 uint32_t chunk_size = buffer[cur++] << 24; |
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296 chunk_size |= buffer[cur++] << 16; |
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297 chunk_size |= buffer[cur++] << 8; |
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298 chunk_size |= buffer[cur++]; |
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299 if (!memcmp(ihdr, buffer + cur, sizeof(ihdr))) { |
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300 if (chunk_size < MIN_IHDR_SIZE || cur + MIN_IHDR_SIZE > buf_size) { |
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301 return NULL; |
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302 } |
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303 cur += sizeof(ihdr); |
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304 *width = buffer[cur++] << 24; |
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305 *width |= buffer[cur++] << 16; |
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306 *width |= buffer[cur++] << 8; |
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307 *width |= buffer[cur++]; |
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308 *height = buffer[cur++] << 24; |
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309 *height |= buffer[cur++] << 16; |
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310 *height |= buffer[cur++] << 8; |
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311 *height |= buffer[cur++]; |
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312 if (*width > MAX_SUPPORTED_DIM || *height > MAX_SUPPORTED_DIM) { |
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313 return NULL; |
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314 } |
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315 bits = buffer[cur++]; |
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316 if (bits != 8) { |
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317 //only support 8-bits per element for now |
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318 return NULL; |
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319 } |
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320 color_type = buffer[cur++]; |
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321 if (color_type > COLOR_TRUE_ALPHA || color_type == 1 || color_type == 5) { |
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322 //reject invalid color type |
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323 return NULL; |
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324 } |
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325 comp_type = buffer[cur++]; |
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326 if (comp_type) { |
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327 //only compression type 0 is defined by the spec |
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328 return NULL; |
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329 } |
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330 filter_type = buffer[cur++]; |
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331 interlace = buffer[cur++]; |
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332 if (interlace) { |
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333 //interlacing not supported for now |
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334 return NULL; |
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335 } |
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336 cur += chunk_size - MIN_IHDR_SIZE; |
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337 has_header = 1; |
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338 } else { |
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339 if (!has_header) { |
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340 //IHDR is required to be the first chunk, fail if it isn't |
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341 break; |
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342 } |
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343 if (!memcmp(plte, buffer + cur, sizeof(plte))) { |
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344 //TODO: implement paletted images |
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345 } else if (!memcmp(idat, buffer + cur, sizeof(idat))) { |
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346 cur += sizeof(idat); |
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347 if (idat_buf) { |
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348 if (idat_needs_free) { |
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349 idat_buf = realloc(idat_buf, idat_size + chunk_size); |
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350 } else { |
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351 uint8_t *tmp = idat_buf; |
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352 idat_buf = malloc(idat_size + chunk_size); |
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353 memcpy(idat_buf, tmp, idat_size); |
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354 } |
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355 memcpy(idat_buf + idat_size, buffer + cur, chunk_size); |
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356 idat_size += chunk_size; |
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357 idat_needs_free = 1; |
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358 } else { |
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359 idat_buf = buffer + cur; |
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360 idat_size = chunk_size; |
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361 } |
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362 cur += chunk_size; |
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363 } else if (!memcmp(iend, buffer + cur, sizeof(iend))) { |
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364 if (!idat_buf) { |
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365 break; |
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366 } |
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367 if (!palette && color_type == COLOR_INDEXED) { |
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368 //indexed color, but no PLTE chunk found |
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369 return NULL; |
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370 } |
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371 uLongf uncompressed_size = *width * *height; |
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372 uint8_t bpp; |
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373 pixel_fun pixel; |
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374 switch (color_type) |
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375 { |
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376 case COLOR_GRAY: |
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377 uncompressed_size *= bits / 8; |
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378 bpp = bits/8; |
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379 pixel = pixel_gray; |
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380 break; |
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381 case COLOR_TRUE: |
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382 uncompressed_size *= 3 * bits / 8; |
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383 bpp = 3 * bits/8; |
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384 pixel = pixel_true; |
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385 break; |
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386 case COLOR_INDEXED: { |
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387 uint32_t pixels_per_byte = 8 / bits; |
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388 uncompressed_size = (*width / pixels_per_byte) * *height; |
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389 if (*width % pixels_per_byte) { |
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390 uncompressed_size += *height; |
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391 } |
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392 bpp = 1; |
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393 break; |
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394 } |
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395 case COLOR_GRAY_ALPHA: |
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396 uncompressed_size *= bits / 4; |
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397 bpp = bits / 4; |
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398 pixel = pixel_gray_alpha; |
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399 break; |
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400 case COLOR_TRUE_ALPHA: |
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401 uncompressed_size *= bits / 2; |
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402 bpp = bits / 2; |
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403 pixel = pixel_true_alpha; |
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404 break; |
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405 } |
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406 //add filter type byte |
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407 uncompressed_size += *height; |
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408 uint8_t *decomp_buffer = malloc(uncompressed_size); |
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409 if (Z_OK != uncompress(decomp_buffer, &uncompressed_size, idat_buf, idat_size)) { |
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410 free(decomp_buffer); |
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411 break; |
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412 } |
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413 out = calloc(*width * *height, sizeof(uint32_t)); |
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414 uint32_t *cur_pixel = out; |
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415 uint8_t *cur_byte = decomp_buffer; |
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416 uint8_t *last_line = NULL; |
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417 for (uint32_t y = 0; y < *height; y++) |
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418 { |
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419 uint8_t filter_type = *(cur_byte++); |
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420 if (filter_type >= sizeof(filters)/sizeof(*filters)) { |
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421 free(out); |
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422 out = NULL; |
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423 free(decomp_buffer); |
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424 break; |
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425 } |
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426 filter_fun filter = filters[filter_type]; |
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427 uint8_t *line_start = cur_byte; |
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428 for (uint32_t x = 0; x < *width; x++) |
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429 { |
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430 *(cur_pixel++) = pixel(&cur_byte, &last_line, bpp, x, filter); |
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431 } |
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432 last_line = line_start; |
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433 } |
1592
31effaadf877
Fix some memory errors (mostly leaks) identified by valgrind
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434 free(decomp_buffer); |
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435 } else { |
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436 //skip uncrecognized chunks |
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437 cur += 4 + chunk_size; |
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438 } |
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439 } |
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440 //skip CRC for now |
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441 cur += sizeof(uint32_t); |
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442 } |
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443 if (idat_needs_free) { |
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444 free(idat_buf); |
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445 } |
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446 free(palette); |
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447 return out; |
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448 } |