Kaoru Onoe / BMPFile

File library for Bitmap images (*.bmp, *.dib). Currently supports only Windows V3 format with 24-bit-per-pixel color depth.

BMPFile.cpp@2:89b273c12b0a, 2015-03-05 (annotated)

Committer:
kayekss
Date:
Thu Mar 05 01:56:29 2015 +0000
Revision:
2:89b273c12b0a
Parent:
1:8cf4beca9695
Child:
3:be3e831a86c1
Fixed wrong array index in function "red"

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kayekss 0:4617bf407fe5 1 // ==================================================== Mar 04 2015, kayeks ==
kayekss 0:4617bf407fe5 2 // BMPFile.cpp
kayekss 0:4617bf407fe5 3 // ===========================================================================
kayekss 0:4617bf407fe5 4 // File library for Bitmap images (*.bmp, *.dib).
kayekss 0:4617bf407fe5 5
kayekss 0:4617bf407fe5 6 #include "BMPFile.h"
kayekss 0:4617bf407fe5 7
kayekss 0:4617bf407fe5 8 const char* BMPFile::StatusString[] = {
kayekss 0:4617bf407fe5 9 "Success",
kayekss 0:4617bf407fe5 10 "NullFileName",
kayekss 0:4617bf407fe5 11 "NoSuchFile",
kayekss 0:4617bf407fe5 12 "NotABitmapFile",
kayekss 0:4617bf407fe5 13 "UnsupportedFormat",
kayekss 0:4617bf407fe5 14 "UnsupportedDepth",
kayekss 0:4617bf407fe5 15 "AllocationFailed"
kayekss 0:4617bf407fe5 16 };
kayekss 0:4617bf407fe5 17 const char* BMPFile::FormatString[] = {
kayekss 1:8cf4beca9695 18 "OS2_V1",
kayekss 1:8cf4beca9695 19 "OS2_V2",
kayekss 0:4617bf407fe5 20 "Windows_V3",
kayekss 0:4617bf407fe5 21 "Windows_V4",
kayekss 0:4617bf407fe5 22 "Windows_V5",
kayekss 0:4617bf407fe5 23 "Unknown"
kayekss 0:4617bf407fe5 24 };
kayekss 0:4617bf407fe5 25
kayekss 0:4617bf407fe5 26 BMPFile::BMPFile(const char* filename) {
kayekss 0:4617bf407fe5 27 FILE* fp;
kayekss 0:4617bf407fe5 28 uint8_t buf8[2];
kayekss 0:4617bf407fe5 29 uint16_t buf16[2];
kayekss 0:4617bf407fe5 30 uint32_t buf32[3];
kayekss 1:8cf4beca9695 31
kayekss 0:4617bf407fe5 32 status = Success;
kayekss 0:4617bf407fe5 33 format = Unknown;
kayekss 0:4617bf407fe5 34 fileSize = 0;
kayekss 1:8cf4beca9695 35 paletteSize = 0;
kayekss 0:4617bf407fe5 36 dataSize = 0;
kayekss 1:8cf4beca9695 37 stride = 0;
kayekss 0:4617bf407fe5 38 width = 0;
kayekss 0:4617bf407fe5 39 height = 0;
kayekss 0:4617bf407fe5 40 colorDepth = 0;
kayekss 1:8cf4beca9695 41 palette = NULL;
kayekss 0:4617bf407fe5 42 data = NULL;
kayekss 0:4617bf407fe5 43
kayekss 0:4617bf407fe5 44 // Open file
kayekss 0:4617bf407fe5 45 if (!filename) {
kayekss 0:4617bf407fe5 46 status = NullFilename;
kayekss 0:4617bf407fe5 47 return;
kayekss 0:4617bf407fe5 48 }
kayekss 0:4617bf407fe5 49 fp = fopen(filename, "rb");
kayekss 0:4617bf407fe5 50 if (!fp) {
kayekss 0:4617bf407fe5 51 status = NoSuchFile;
kayekss 0:4617bf407fe5 52 return;
kayekss 0:4617bf407fe5 53 }
kayekss 0:4617bf407fe5 54
kayekss 0:4617bf407fe5 55 // (0 +2) Magic number ("BM")
kayekss 0:4617bf407fe5 56 fread(buf8, 1, 2, fp);
kayekss 0:4617bf407fe5 57 if (buf8[0] != 'B' || buf8[1] != 'M') {
kayekss 0:4617bf407fe5 58 status = NotABitmapFile;
kayekss 0:4617bf407fe5 59 fclose(fp);
kayekss 0:4617bf407fe5 60 return;
kayekss 0:4617bf407fe5 61 }
kayekss 0:4617bf407fe5 62
kayekss 0:4617bf407fe5 63 // (2 +4) File size
kayekss 0:4617bf407fe5 64 // (6 +4) Reserved area
kayekss 0:4617bf407fe5 65 // (10 +4) Image data offset (unconfirmed)
kayekss 0:4617bf407fe5 66 fread(buf32, 4, 3, fp);
kayekss 0:4617bf407fe5 67 fileSize = buf32[0];
kayekss 0:4617bf407fe5 68
kayekss 0:4617bf407fe5 69 // (14 +4) Header size
kayekss 0:4617bf407fe5 70 fread(buf32, 4, 1, fp);
kayekss 0:4617bf407fe5 71 switch (buf32[0]) {
kayekss 1:8cf4beca9695 72 case 12: // OS/2 V1 format
kayekss 1:8cf4beca9695 73 format = OS2_V1;
kayekss 1:8cf4beca9695 74 break;
kayekss 1:8cf4beca9695 75 case 64: // OS/2 V2 format
kayekss 1:8cf4beca9695 76 format = OS2_V2;
kayekss 1:8cf4beca9695 77 break;
kayekss 0:4617bf407fe5 78 case 40: // Windows V3 format
kayekss 0:4617bf407fe5 79 format = Windows_V3;
kayekss 0:4617bf407fe5 80 break;
kayekss 0:4617bf407fe5 81 case 108: // Windows V4 format
kayekss 0:4617bf407fe5 82 format = Windows_V4;
kayekss 0:4617bf407fe5 83 break;
kayekss 0:4617bf407fe5 84 case 124: // Windows V5 format
kayekss 0:4617bf407fe5 85 format = Windows_V5;
kayekss 0:4617bf407fe5 86 break;
kayekss 0:4617bf407fe5 87 default:
kayekss 0:4617bf407fe5 88 format = Unknown;
kayekss 0:4617bf407fe5 89 }
kayekss 0:4617bf407fe5 90
kayekss 0:4617bf407fe5 91 switch (format) {
kayekss 1:8cf4beca9695 92 case OS2_V1:
kayekss 1:8cf4beca9695 93 // (18 +2) Bitmap width
kayekss 1:8cf4beca9695 94 // (20 +2) Bitmap height
kayekss 1:8cf4beca9695 95 fread(buf16, 4, 2, fp);
kayekss 1:8cf4beca9695 96 width = (uint32_t) buf16[0];
kayekss 1:8cf4beca9695 97 height = (uint32_t) buf16[1];
kayekss 1:8cf4beca9695 98
kayekss 1:8cf4beca9695 99 // (22 +2) Number of planes (unconfirmed)
kayekss 1:8cf4beca9695 100 // (24 +2) Color depth
kayekss 1:8cf4beca9695 101 fread(buf16, 2, 2, fp);
kayekss 1:8cf4beca9695 102 colorDepth = buf16[1];
kayekss 1:8cf4beca9695 103 switch (colorDepth) {
kayekss 1:8cf4beca9695 104 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 105 paletteSize = paletteElemSize(format) * (1ul << colorDepth);
kayekss 1:8cf4beca9695 106 break;
kayekss 1:8cf4beca9695 107 case 16: case 24: case 32: // No palette
kayekss 1:8cf4beca9695 108 paletteSize = 0;
kayekss 1:8cf4beca9695 109 break;
kayekss 1:8cf4beca9695 110 default:
kayekss 1:8cf4beca9695 111 paletteSize = 0;
kayekss 1:8cf4beca9695 112 status = UnsupportedDepth;
kayekss 1:8cf4beca9695 113 fclose(fp);
kayekss 1:8cf4beca9695 114 return;
kayekss 1:8cf4beca9695 115 }
kayekss 1:8cf4beca9695 116 break;
kayekss 0:4617bf407fe5 117 case Windows_V3:
kayekss 0:4617bf407fe5 118 // (18 +4) Bitmap width
kayekss 0:4617bf407fe5 119 // (22 +4) Bitmap height
kayekss 0:4617bf407fe5 120 fread(buf32, 4, 2, fp);
kayekss 0:4617bf407fe5 121 width = buf32[0];
kayekss 0:4617bf407fe5 122 height = buf32[1];
kayekss 0:4617bf407fe5 123
kayekss 0:4617bf407fe5 124 // (26 +2) Number of planes (unconfirmed)
kayekss 0:4617bf407fe5 125 // (28 +2) Color depth
kayekss 0:4617bf407fe5 126 fread(buf16, 2, 2, fp);
kayekss 0:4617bf407fe5 127 colorDepth = buf16[1];
kayekss 1:8cf4beca9695 128 switch (colorDepth) {
kayekss 1:8cf4beca9695 129 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 130 paletteSize = paletteElemSize(format) * (1ul << colorDepth);
kayekss 1:8cf4beca9695 131 break;
kayekss 1:8cf4beca9695 132 case 16: case 24: case 32: // No palette
kayekss 1:8cf4beca9695 133 paletteSize = 0;
kayekss 1:8cf4beca9695 134 break;
kayekss 1:8cf4beca9695 135 default:
kayekss 1:8cf4beca9695 136 paletteSize = 0;
kayekss 0:4617bf407fe5 137 status = UnsupportedDepth;
kayekss 0:4617bf407fe5 138 fclose(fp);
kayekss 0:4617bf407fe5 139 return;
kayekss 0:4617bf407fe5 140 }
kayekss 0:4617bf407fe5 141
kayekss 0:4617bf407fe5 142 // (30 +4) Compression method (unconfirmed)
kayekss 0:4617bf407fe5 143 // (34 +4) Bitmap data size (unconfirmed)
kayekss 0:4617bf407fe5 144 // (38 +4) Horizontal resolution (unused)
kayekss 0:4617bf407fe5 145 // (42 +4) Vertical resolution (unconfirmed)
kayekss 0:4617bf407fe5 146 // (46 +4) Colors (unconfirmed)
kayekss 0:4617bf407fe5 147 // (50 +4) Important colors (unconfirmed)
kayekss 0:4617bf407fe5 148 fread(buf32, 4, 3, fp);
kayekss 0:4617bf407fe5 149 fread(buf32, 4, 3, fp);
kayekss 0:4617bf407fe5 150 break;
kayekss 1:8cf4beca9695 151 case OS2_V2:
kayekss 0:4617bf407fe5 152 case Windows_V4:
kayekss 0:4617bf407fe5 153 case Windows_V5:
kayekss 0:4617bf407fe5 154 case Unknown:
kayekss 0:4617bf407fe5 155 status = UnsupportedFormat;
kayekss 0:4617bf407fe5 156 fclose(fp);
kayekss 0:4617bf407fe5 157 return;
kayekss 0:4617bf407fe5 158 }
kayekss 1:8cf4beca9695 159
kayekss 1:8cf4beca9695 160 // Allocate palette space if needed
kayekss 1:8cf4beca9695 161 if (paletteSize) {
kayekss 1:8cf4beca9695 162 palette = new uint8_t[paletteSize];
kayekss 1:8cf4beca9695 163
kayekss 1:8cf4beca9695 164 // Read palette data
kayekss 1:8cf4beca9695 165 fread(palette, 1, paletteSize, fp);
kayekss 1:8cf4beca9695 166 }
kayekss 0:4617bf407fe5 167
kayekss 1:8cf4beca9695 168 // Calculate stride / data length
kayekss 1:8cf4beca9695 169 if (colorDepth == 1) {
kayekss 1:8cf4beca9695 170 stride = ALIGN_BY_4((width + 7) / 8);
kayekss 1:8cf4beca9695 171 } else if (colorDepth == 4) {
kayekss 1:8cf4beca9695 172 stride = ALIGN_BY_4((width + 1) / 2);
kayekss 1:8cf4beca9695 173 } else {
kayekss 1:8cf4beca9695 174 // Color depth: 8, 16, 24, 32
kayekss 1:8cf4beca9695 175 stride = ALIGN_BY_4(width * colorDepth / 8);
kayekss 1:8cf4beca9695 176 }
kayekss 1:8cf4beca9695 177 dataSize = stride * height;
kayekss 0:4617bf407fe5 178
kayekss 0:4617bf407fe5 179 // Allocate data space
kayekss 0:4617bf407fe5 180 data = new uint8_t[dataSize];
kayekss 0:4617bf407fe5 181
kayekss 0:4617bf407fe5 182 // Read bitmap data
kayekss 0:4617bf407fe5 183 fread(data, 1, dataSize, fp);
kayekss 0:4617bf407fe5 184
kayekss 0:4617bf407fe5 185 fclose(fp);
kayekss 0:4617bf407fe5 186 }
kayekss 0:4617bf407fe5 187
kayekss 0:4617bf407fe5 188 BMPFile::~BMPFile() {
kayekss 1:8cf4beca9695 189 if (palette) {
kayekss 1:8cf4beca9695 190 delete[] palette;
kayekss 1:8cf4beca9695 191 }
kayekss 0:4617bf407fe5 192 if (data) {
kayekss 0:4617bf407fe5 193 delete[] data;
kayekss 0:4617bf407fe5 194 }
kayekss 0:4617bf407fe5 195 }
kayekss 1:8cf4beca9695 196
kayekss 1:8cf4beca9695 197 uint32_t BMPFile::paletteElemSize(BMPFile::Format format) {
kayekss 1:8cf4beca9695 198 switch (format) {
kayekss 1:8cf4beca9695 199 case OS2_V1: case OS2_V2:
kayekss 1:8cf4beca9695 200 // BGR888
kayekss 1:8cf4beca9695 201 return 3;
kayekss 1:8cf4beca9695 202 case Windows_V3: case Windows_V4: case Windows_V5:
kayekss 1:8cf4beca9695 203 // BGRX8888
kayekss 1:8cf4beca9695 204 return 4;
kayekss 1:8cf4beca9695 205 default:
kayekss 1:8cf4beca9695 206 return 0;
kayekss 1:8cf4beca9695 207 }
kayekss 1:8cf4beca9695 208 }
kayekss 1:8cf4beca9695 209
kayekss 1:8cf4beca9695 210 int32_t BMPFile::paletteRed(uint8_t index) {
kayekss 1:8cf4beca9695 211 if (!palette) {
kayekss 1:8cf4beca9695 212 return -1;
kayekss 1:8cf4beca9695 213 }
kayekss 1:8cf4beca9695 214 switch (colorDepth) {
kayekss 1:8cf4beca9695 215 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 216 if (index >= 1ul << colorDepth) {
kayekss 1:8cf4beca9695 217 return -1;
kayekss 1:8cf4beca9695 218 } else {
kayekss 1:8cf4beca9695 219 return palette[paletteElemSize(format) * index + 2];
kayekss 1:8cf4beca9695 220 }
kayekss 1:8cf4beca9695 221 default:
kayekss 1:8cf4beca9695 222 return -1;
kayekss 1:8cf4beca9695 223 }
kayekss 1:8cf4beca9695 224 }
kayekss 1:8cf4beca9695 225
kayekss 1:8cf4beca9695 226 int32_t BMPFile::paletteGreen(uint8_t index) {
kayekss 1:8cf4beca9695 227 if (!palette) {
kayekss 1:8cf4beca9695 228 return -1;
kayekss 1:8cf4beca9695 229 }
kayekss 1:8cf4beca9695 230 switch (colorDepth) {
kayekss 1:8cf4beca9695 231 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 232 if (index >= 1ul << colorDepth) {
kayekss 1:8cf4beca9695 233 return -1;
kayekss 1:8cf4beca9695 234 } else {
kayekss 1:8cf4beca9695 235 return palette[paletteElemSize(format) * index + 1];
kayekss 1:8cf4beca9695 236 }
kayekss 1:8cf4beca9695 237 default:
kayekss 1:8cf4beca9695 238 return -1;
kayekss 1:8cf4beca9695 239 }
kayekss 1:8cf4beca9695 240 }
kayekss 1:8cf4beca9695 241
kayekss 1:8cf4beca9695 242 int32_t BMPFile::paletteBlue(uint8_t index) {
kayekss 1:8cf4beca9695 243 if (!palette) {
kayekss 1:8cf4beca9695 244 return -1;
kayekss 1:8cf4beca9695 245 }
kayekss 1:8cf4beca9695 246 switch (colorDepth) {
kayekss 1:8cf4beca9695 247 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 248 if (index >= 1ul << colorDepth) {
kayekss 1:8cf4beca9695 249 return -1;
kayekss 1:8cf4beca9695 250 } else {
kayekss 1:8cf4beca9695 251 return palette[paletteElemSize(format) * index];
kayekss 1:8cf4beca9695 252 }
kayekss 1:8cf4beca9695 253 default:
kayekss 1:8cf4beca9695 254 return -1;
kayekss 1:8cf4beca9695 255 }
kayekss 1:8cf4beca9695 256 }
kayekss 1:8cf4beca9695 257
kayekss 1:8cf4beca9695 258 int32_t BMPFile::red(uint32_t x, uint32_t y) {
kayekss 1:8cf4beca9695 259 if (x >= width || y >= height) {
kayekss 1:8cf4beca9695 260 return -1;
kayekss 1:8cf4beca9695 261 }
kayekss 1:8cf4beca9695 262 if (!data) {
kayekss 1:8cf4beca9695 263 return -1;
kayekss 1:8cf4beca9695 264 }
kayekss 1:8cf4beca9695 265 switch (colorDepth) {
kayekss 1:8cf4beca9695 266 case 1: // Indexed from palette
kayekss 1:8cf4beca9695 267 return paletteRed((data[stride * y + x / 8] >> 7 - x % 8) & 0x01);
kayekss 1:8cf4beca9695 268 case 4: // Indexed from palette
kayekss 1:8cf4beca9695 269 return paletteRed((data[stride * y + x / 2] >> 4 * (1 - x % 2)) & 0x0f);
kayekss 1:8cf4beca9695 270 case 8: // Indexed from palette
kayekss 1:8cf4beca9695 271 return paletteRed(data[stride * y + x]);
kayekss 1:8cf4beca9695 272 case 16: // BGR565 (bbbbbggg:gggrrrrr)
kayekss 1:8cf4beca9695 273 return data[stride * y + 2 * x + 1] & 0x1f;
kayekss 1:8cf4beca9695 274 case 24: // BGR888
kayekss 2:89b273c12b0a 275 return data[stride * y + 3 * x + 2];
kayekss 1:8cf4beca9695 276 case 32: // BGRX8888
kayekss 2:89b273c12b0a 277 return data[stride * y + 4 * x + 2];
kayekss 1:8cf4beca9695 278 default:
kayekss 1:8cf4beca9695 279 return -1;
kayekss 1:8cf4beca9695 280 }
kayekss 1:8cf4beca9695 281 }
kayekss 1:8cf4beca9695 282
kayekss 1:8cf4beca9695 283 int32_t BMPFile::green(uint32_t x, uint32_t y) {
kayekss 1:8cf4beca9695 284 if (x >= width || y >= height) {
kayekss 1:8cf4beca9695 285 return -1;
kayekss 1:8cf4beca9695 286 }
kayekss 1:8cf4beca9695 287 if (!data) {
kayekss 1:8cf4beca9695 288 return -1;
kayekss 1:8cf4beca9695 289 }
kayekss 1:8cf4beca9695 290 switch (colorDepth) {
kayekss 1:8cf4beca9695 291 case 1: // Indexed from palette
kayekss 1:8cf4beca9695 292 return paletteGreen((data[stride * y + x / 8] >> 7 - x % 8) & 0x01);
kayekss 1:8cf4beca9695 293 case 4: // Indexed from palette
kayekss 1:8cf4beca9695 294 return paletteGreen((data[stride * y + x / 2] >> 4 * (1 - x % 2)) & 0x0f);
kayekss 1:8cf4beca9695 295 case 8: // Indexed from palette
kayekss 1:8cf4beca9695 296 return paletteGreen(data[stride * y + x]);
kayekss 1:8cf4beca9695 297 case 16: // BGR565 (bbbbbggg:gggrrrrr)
kayekss 1:8cf4beca9695 298 return (data[stride * y + 2 * x] & 0x07) << 3
kayekss 1:8cf4beca9695 299 | data[stride * y + 2 * x + 1] >> 5;
kayekss 1:8cf4beca9695 300 case 24: // BGR888
kayekss 1:8cf4beca9695 301 return data[stride * y + 3 * x + 1];
kayekss 1:8cf4beca9695 302 case 32: // BGRX8888
kayekss 1:8cf4beca9695 303 return data[stride * y + 4 * x + 1];
kayekss 1:8cf4beca9695 304 default:
kayekss 1:8cf4beca9695 305 return -1;
kayekss 1:8cf4beca9695 306 }
kayekss 1:8cf4beca9695 307 }
kayekss 1:8cf4beca9695 308
kayekss 1:8cf4beca9695 309 int32_t BMPFile::blue(uint32_t x, uint32_t y) {
kayekss 1:8cf4beca9695 310 if (x >= width || y >= height) {
kayekss 1:8cf4beca9695 311 return -1;
kayekss 1:8cf4beca9695 312 }
kayekss 1:8cf4beca9695 313 if (!data) {
kayekss 1:8cf4beca9695 314 return -1;
kayekss 1:8cf4beca9695 315 }
kayekss 1:8cf4beca9695 316 switch (colorDepth) {
kayekss 1:8cf4beca9695 317 case 1: // Indexed from palette
kayekss 1:8cf4beca9695 318 return paletteBlue((data[stride * y + x / 8] >> 7 - x % 8) & 0x01);
kayekss 1:8cf4beca9695 319 case 4: // Indexed from palette
kayekss 1:8cf4beca9695 320 return paletteBlue((data[stride * y + x / 2] >> 4 * (1 - x % 2)) & 0x0f);
kayekss 1:8cf4beca9695 321 case 8: // Indexed from palette
kayekss 1:8cf4beca9695 322 return paletteBlue(data[stride * y + x]);
kayekss 1:8cf4beca9695 323 case 16: // RGB565 (bbbbbggg:gggrrrrr)
kayekss 1:8cf4beca9695 324 return data[stride * y + 2 * x] >> 3;
kayekss 1:8cf4beca9695 325 case 24: // BGR888
kayekss 1:8cf4beca9695 326 return data[stride * y + 3 * x];
kayekss 1:8cf4beca9695 327 case 32: // BGRX8888
kayekss 1:8cf4beca9695 328 return data[stride * y + 4 * x];
kayekss 1:8cf4beca9695 329 default:
kayekss 1:8cf4beca9695 330 return -1;
kayekss 1:8cf4beca9695 331 }
kayekss 1:8cf4beca9695 332 }