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@3:be3e831a86c1, 2015-04-05 (annotated)

Committer:
kayekss
Date:
Sun Apr 05 14:19:49 2015 +0000
Revision:
3:be3e831a86c1
Parent:
2:89b273c12b0a 
(1) Add constructor switch: fetch/not fetch image data. (2) RGB return value is doubled in 16-bit-per-pixel mode.

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 3:be3e831a86c1 26 void BMPFile::readFile(FILE* fp, bool fetchData) {
kayekss 0:4617bf407fe5 27 uint8_t buf8[2];
kayekss 0:4617bf407fe5 28 uint16_t buf16[2];
kayekss 0:4617bf407fe5 29 uint32_t buf32[3];
kayekss 1:8cf4beca9695 30
kayekss 0:4617bf407fe5 31 if (!fp) {
kayekss 0:4617bf407fe5 32 status = NoSuchFile;
kayekss 0:4617bf407fe5 33 return;
kayekss 0:4617bf407fe5 34 }
kayekss 0:4617bf407fe5 35
kayekss 0:4617bf407fe5 36 // (0 +2) Magic number ("BM")
kayekss 0:4617bf407fe5 37 fread(buf8, 1, 2, fp);
kayekss 0:4617bf407fe5 38 if (buf8[0] != 'B' || buf8[1] != 'M') {
kayekss 0:4617bf407fe5 39 status = NotABitmapFile;
kayekss 0:4617bf407fe5 40 fclose(fp);
kayekss 0:4617bf407fe5 41 return;
kayekss 0:4617bf407fe5 42 }
kayekss 0:4617bf407fe5 43
kayekss 0:4617bf407fe5 44 // (2 +4) File size
kayekss 0:4617bf407fe5 45 // (6 +4) Reserved area
kayekss 0:4617bf407fe5 46 // (10 +4) Image data offset (unconfirmed)
kayekss 0:4617bf407fe5 47 fread(buf32, 4, 3, fp);
kayekss 0:4617bf407fe5 48 fileSize = buf32[0];
kayekss 0:4617bf407fe5 49
kayekss 0:4617bf407fe5 50 // (14 +4) Header size
kayekss 0:4617bf407fe5 51 fread(buf32, 4, 1, fp);
kayekss 0:4617bf407fe5 52 switch (buf32[0]) {
kayekss 1:8cf4beca9695 53 case 12: // OS/2 V1 format
kayekss 1:8cf4beca9695 54 format = OS2_V1;
kayekss 1:8cf4beca9695 55 break;
kayekss 1:8cf4beca9695 56 case 64: // OS/2 V2 format
kayekss 1:8cf4beca9695 57 format = OS2_V2;
kayekss 1:8cf4beca9695 58 break;
kayekss 0:4617bf407fe5 59 case 40: // Windows V3 format
kayekss 0:4617bf407fe5 60 format = Windows_V3;
kayekss 0:4617bf407fe5 61 break;
kayekss 0:4617bf407fe5 62 case 108: // Windows V4 format
kayekss 0:4617bf407fe5 63 format = Windows_V4;
kayekss 0:4617bf407fe5 64 break;
kayekss 0:4617bf407fe5 65 case 124: // Windows V5 format
kayekss 0:4617bf407fe5 66 format = Windows_V5;
kayekss 0:4617bf407fe5 67 break;
kayekss 0:4617bf407fe5 68 default:
kayekss 0:4617bf407fe5 69 format = Unknown;
kayekss 0:4617bf407fe5 70 }
kayekss 0:4617bf407fe5 71
kayekss 0:4617bf407fe5 72 switch (format) {
kayekss 1:8cf4beca9695 73 case OS2_V1:
kayekss 1:8cf4beca9695 74 // (18 +2) Bitmap width
kayekss 1:8cf4beca9695 75 // (20 +2) Bitmap height
kayekss 1:8cf4beca9695 76 fread(buf16, 4, 2, fp);
kayekss 1:8cf4beca9695 77 width = (uint32_t) buf16[0];
kayekss 1:8cf4beca9695 78 height = (uint32_t) buf16[1];
kayekss 1:8cf4beca9695 79
kayekss 1:8cf4beca9695 80 // (22 +2) Number of planes (unconfirmed)
kayekss 1:8cf4beca9695 81 // (24 +2) Color depth
kayekss 1:8cf4beca9695 82 fread(buf16, 2, 2, fp);
kayekss 1:8cf4beca9695 83 colorDepth = buf16[1];
kayekss 1:8cf4beca9695 84 switch (colorDepth) {
kayekss 1:8cf4beca9695 85 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 86 paletteSize = paletteElemSize(format) * (1ul << colorDepth);
kayekss 1:8cf4beca9695 87 break;
kayekss 1:8cf4beca9695 88 case 16: case 24: case 32: // No palette
kayekss 1:8cf4beca9695 89 paletteSize = 0;
kayekss 1:8cf4beca9695 90 break;
kayekss 1:8cf4beca9695 91 default:
kayekss 1:8cf4beca9695 92 paletteSize = 0;
kayekss 1:8cf4beca9695 93 status = UnsupportedDepth;
kayekss 1:8cf4beca9695 94 fclose(fp);
kayekss 1:8cf4beca9695 95 return;
kayekss 1:8cf4beca9695 96 }
kayekss 1:8cf4beca9695 97 break;
kayekss 0:4617bf407fe5 98 case Windows_V3:
kayekss 0:4617bf407fe5 99 // (18 +4) Bitmap width
kayekss 0:4617bf407fe5 100 // (22 +4) Bitmap height
kayekss 0:4617bf407fe5 101 fread(buf32, 4, 2, fp);
kayekss 0:4617bf407fe5 102 width = buf32[0];
kayekss 0:4617bf407fe5 103 height = buf32[1];
kayekss 0:4617bf407fe5 104
kayekss 0:4617bf407fe5 105 // (26 +2) Number of planes (unconfirmed)
kayekss 0:4617bf407fe5 106 // (28 +2) Color depth
kayekss 0:4617bf407fe5 107 fread(buf16, 2, 2, fp);
kayekss 0:4617bf407fe5 108 colorDepth = buf16[1];
kayekss 1:8cf4beca9695 109 switch (colorDepth) {
kayekss 1:8cf4beca9695 110 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 111 paletteSize = paletteElemSize(format) * (1ul << colorDepth);
kayekss 1:8cf4beca9695 112 break;
kayekss 1:8cf4beca9695 113 case 16: case 24: case 32: // No palette
kayekss 1:8cf4beca9695 114 paletteSize = 0;
kayekss 1:8cf4beca9695 115 break;
kayekss 1:8cf4beca9695 116 default:
kayekss 1:8cf4beca9695 117 paletteSize = 0;
kayekss 0:4617bf407fe5 118 status = UnsupportedDepth;
kayekss 0:4617bf407fe5 119 fclose(fp);
kayekss 0:4617bf407fe5 120 return;
kayekss 0:4617bf407fe5 121 }
kayekss 0:4617bf407fe5 122
kayekss 0:4617bf407fe5 123 // (30 +4) Compression method (unconfirmed)
kayekss 0:4617bf407fe5 124 // (34 +4) Bitmap data size (unconfirmed)
kayekss 0:4617bf407fe5 125 // (38 +4) Horizontal resolution (unused)
kayekss 0:4617bf407fe5 126 // (42 +4) Vertical resolution (unconfirmed)
kayekss 0:4617bf407fe5 127 // (46 +4) Colors (unconfirmed)
kayekss 0:4617bf407fe5 128 // (50 +4) Important colors (unconfirmed)
kayekss 0:4617bf407fe5 129 fread(buf32, 4, 3, fp);
kayekss 0:4617bf407fe5 130 fread(buf32, 4, 3, fp);
kayekss 0:4617bf407fe5 131 break;
kayekss 1:8cf4beca9695 132 case OS2_V2:
kayekss 0:4617bf407fe5 133 case Windows_V4:
kayekss 0:4617bf407fe5 134 case Windows_V5:
kayekss 0:4617bf407fe5 135 case Unknown:
kayekss 0:4617bf407fe5 136 status = UnsupportedFormat;
kayekss 0:4617bf407fe5 137 fclose(fp);
kayekss 0:4617bf407fe5 138 return;
kayekss 0:4617bf407fe5 139 }
kayekss 1:8cf4beca9695 140
kayekss 1:8cf4beca9695 141 // Allocate palette space if needed
kayekss 1:8cf4beca9695 142 if (paletteSize) {
kayekss 1:8cf4beca9695 143 palette = new uint8_t[paletteSize];
kayekss 1:8cf4beca9695 144
kayekss 1:8cf4beca9695 145 // Read palette data
kayekss 1:8cf4beca9695 146 fread(palette, 1, paletteSize, fp);
kayekss 1:8cf4beca9695 147 }
kayekss 0:4617bf407fe5 148
kayekss 1:8cf4beca9695 149 // Calculate stride / data length
kayekss 1:8cf4beca9695 150 if (colorDepth == 1) {
kayekss 1:8cf4beca9695 151 stride = ALIGN_BY_4((width + 7) / 8);
kayekss 1:8cf4beca9695 152 } else if (colorDepth == 4) {
kayekss 1:8cf4beca9695 153 stride = ALIGN_BY_4((width + 1) / 2);
kayekss 1:8cf4beca9695 154 } else {
kayekss 1:8cf4beca9695 155 // Color depth: 8, 16, 24, 32
kayekss 1:8cf4beca9695 156 stride = ALIGN_BY_4(width * colorDepth / 8);
kayekss 1:8cf4beca9695 157 }
kayekss 1:8cf4beca9695 158 dataSize = stride * height;
kayekss 0:4617bf407fe5 159
kayekss 3:be3e831a86c1 160 // Read image data
kayekss 3:be3e831a86c1 161 if (fetchData) {
kayekss 3:be3e831a86c1 162 readImageData(fp);
kayekss 3:be3e831a86c1 163 }
kayekss 3:be3e831a86c1 164 fclose(fp);
kayekss 3:be3e831a86c1 165 }
kayekss 3:be3e831a86c1 166
kayekss 3:be3e831a86c1 167 BMPFile::BMPFile(const char* filename, bool fetchData) {
kayekss 3:be3e831a86c1 168 FILE* fp;
kayekss 3:be3e831a86c1 169
kayekss 3:be3e831a86c1 170 status = Success;
kayekss 3:be3e831a86c1 171 format = Unknown;
kayekss 3:be3e831a86c1 172 fileSize = 0;
kayekss 3:be3e831a86c1 173 paletteSize = 0;
kayekss 3:be3e831a86c1 174 dataSize = 0;
kayekss 3:be3e831a86c1 175 stride = 0;
kayekss 3:be3e831a86c1 176 width = 0;
kayekss 3:be3e831a86c1 177 height = 0;
kayekss 3:be3e831a86c1 178 colorDepth = 0;
kayekss 3:be3e831a86c1 179 palette = NULL;
kayekss 3:be3e831a86c1 180 data = NULL;
kayekss 0:4617bf407fe5 181
kayekss 3:be3e831a86c1 182 // Open file
kayekss 3:be3e831a86c1 183 if (!filename) {
kayekss 3:be3e831a86c1 184 status = NullFilename;
kayekss 3:be3e831a86c1 185 return;
kayekss 3:be3e831a86c1 186 }
kayekss 3:be3e831a86c1 187 fp = fopen(filename, "rb");
kayekss 0:4617bf407fe5 188
kayekss 3:be3e831a86c1 189 // Read file
kayekss 3:be3e831a86c1 190 readFile(fp, fetchData);
kayekss 3:be3e831a86c1 191 }
kayekss 3:be3e831a86c1 192
kayekss 3:be3e831a86c1 193 BMPFile::BMPFile(FILE* fp, bool fetch) {
kayekss 3:be3e831a86c1 194 status = Success;
kayekss 3:be3e831a86c1 195 format = Unknown;
kayekss 3:be3e831a86c1 196 fileSize = 0;
kayekss 3:be3e831a86c1 197 paletteSize = 0;
kayekss 3:be3e831a86c1 198 dataSize = 0;
kayekss 3:be3e831a86c1 199 stride = 0;
kayekss 3:be3e831a86c1 200 width = 0;
kayekss 3:be3e831a86c1 201 height = 0;
kayekss 3:be3e831a86c1 202 colorDepth = 0;
kayekss 3:be3e831a86c1 203 palette = NULL;
kayekss 3:be3e831a86c1 204 data = NULL;
kayekss 3:be3e831a86c1 205
kayekss 3:be3e831a86c1 206 // Read file
kayekss 3:be3e831a86c1 207 readFile(fp, fetch);
kayekss 0:4617bf407fe5 208 }
kayekss 0:4617bf407fe5 209
kayekss 0:4617bf407fe5 210 BMPFile::~BMPFile() {
kayekss 1:8cf4beca9695 211 if (palette) {
kayekss 1:8cf4beca9695 212 delete[] palette;
kayekss 1:8cf4beca9695 213 }
kayekss 0:4617bf407fe5 214 if (data) {
kayekss 0:4617bf407fe5 215 delete[] data;
kayekss 0:4617bf407fe5 216 }
kayekss 0:4617bf407fe5 217 }
kayekss 1:8cf4beca9695 218
kayekss 3:be3e831a86c1 219 void BMPFile::readImageData(FILE* fp) {
kayekss 3:be3e831a86c1 220 // Allocate data space
kayekss 3:be3e831a86c1 221 data = new uint8_t[dataSize];
kayekss 3:be3e831a86c1 222
kayekss 3:be3e831a86c1 223 // Read bitmap data
kayekss 3:be3e831a86c1 224 fread(data, 1, dataSize, fp);
kayekss 3:be3e831a86c1 225 }
kayekss 3:be3e831a86c1 226
kayekss 1:8cf4beca9695 227 uint32_t BMPFile::paletteElemSize(BMPFile::Format format) {
kayekss 1:8cf4beca9695 228 switch (format) {
kayekss 1:8cf4beca9695 229 case OS2_V1: case OS2_V2:
kayekss 1:8cf4beca9695 230 // BGR888
kayekss 1:8cf4beca9695 231 return 3;
kayekss 1:8cf4beca9695 232 case Windows_V3: case Windows_V4: case Windows_V5:
kayekss 1:8cf4beca9695 233 // BGRX8888
kayekss 1:8cf4beca9695 234 return 4;
kayekss 1:8cf4beca9695 235 default:
kayekss 1:8cf4beca9695 236 return 0;
kayekss 1:8cf4beca9695 237 }
kayekss 1:8cf4beca9695 238 }
kayekss 1:8cf4beca9695 239
kayekss 1:8cf4beca9695 240 int32_t BMPFile::paletteRed(uint8_t index) {
kayekss 1:8cf4beca9695 241 if (!palette) {
kayekss 1:8cf4beca9695 242 return -1;
kayekss 1:8cf4beca9695 243 }
kayekss 1:8cf4beca9695 244 switch (colorDepth) {
kayekss 1:8cf4beca9695 245 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 246 if (index >= 1ul << colorDepth) {
kayekss 1:8cf4beca9695 247 return -1;
kayekss 1:8cf4beca9695 248 } else {
kayekss 1:8cf4beca9695 249 return palette[paletteElemSize(format) * index + 2];
kayekss 1:8cf4beca9695 250 }
kayekss 1:8cf4beca9695 251 default:
kayekss 1:8cf4beca9695 252 return -1;
kayekss 1:8cf4beca9695 253 }
kayekss 1:8cf4beca9695 254 }
kayekss 1:8cf4beca9695 255
kayekss 1:8cf4beca9695 256 int32_t BMPFile::paletteGreen(uint8_t index) {
kayekss 1:8cf4beca9695 257 if (!palette) {
kayekss 1:8cf4beca9695 258 return -1;
kayekss 1:8cf4beca9695 259 }
kayekss 1:8cf4beca9695 260 switch (colorDepth) {
kayekss 1:8cf4beca9695 261 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 262 if (index >= 1ul << colorDepth) {
kayekss 1:8cf4beca9695 263 return -1;
kayekss 1:8cf4beca9695 264 } else {
kayekss 1:8cf4beca9695 265 return palette[paletteElemSize(format) * index + 1];
kayekss 1:8cf4beca9695 266 }
kayekss 1:8cf4beca9695 267 default:
kayekss 1:8cf4beca9695 268 return -1;
kayekss 1:8cf4beca9695 269 }
kayekss 1:8cf4beca9695 270 }
kayekss 1:8cf4beca9695 271
kayekss 1:8cf4beca9695 272 int32_t BMPFile::paletteBlue(uint8_t index) {
kayekss 1:8cf4beca9695 273 if (!palette) {
kayekss 1:8cf4beca9695 274 return -1;
kayekss 1:8cf4beca9695 275 }
kayekss 1:8cf4beca9695 276 switch (colorDepth) {
kayekss 1:8cf4beca9695 277 case 1: case 4: case 8:
kayekss 1:8cf4beca9695 278 if (index >= 1ul << colorDepth) {
kayekss 1:8cf4beca9695 279 return -1;
kayekss 1:8cf4beca9695 280 } else {
kayekss 1:8cf4beca9695 281 return palette[paletteElemSize(format) * index];
kayekss 1:8cf4beca9695 282 }
kayekss 1:8cf4beca9695 283 default:
kayekss 1:8cf4beca9695 284 return -1;
kayekss 1:8cf4beca9695 285 }
kayekss 1:8cf4beca9695 286 }
kayekss 1:8cf4beca9695 287
kayekss 1:8cf4beca9695 288 int32_t BMPFile::red(uint32_t x, uint32_t y) {
kayekss 1:8cf4beca9695 289 if (x >= width || y >= height) {
kayekss 1:8cf4beca9695 290 return -1;
kayekss 1:8cf4beca9695 291 }
kayekss 1:8cf4beca9695 292 if (!data) {
kayekss 1:8cf4beca9695 293 return -1;
kayekss 1:8cf4beca9695 294 }
kayekss 1:8cf4beca9695 295 switch (colorDepth) {
kayekss 1:8cf4beca9695 296 case 1: // Indexed from palette
kayekss 1:8cf4beca9695 297 return paletteRed((data[stride * y + x / 8] >> 7 - x % 8) & 0x01);
kayekss 1:8cf4beca9695 298 case 4: // Indexed from palette
kayekss 1:8cf4beca9695 299 return paletteRed((data[stride * y + x / 2] >> 4 * (1 - x % 2)) & 0x0f);
kayekss 1:8cf4beca9695 300 case 8: // Indexed from palette
kayekss 1:8cf4beca9695 301 return paletteRed(data[stride * y + x]);
kayekss 1:8cf4beca9695 302 case 16: // BGR565 (bbbbbggg:gggrrrrr)
kayekss 3:be3e831a86c1 303 return (data[stride * y + 2 * x + 1] & 0x1f) * 2;
kayekss 1:8cf4beca9695 304 case 24: // BGR888
kayekss 2:89b273c12b0a 305 return data[stride * y + 3 * x + 2];
kayekss 1:8cf4beca9695 306 case 32: // BGRX8888
kayekss 2:89b273c12b0a 307 return data[stride * y + 4 * x + 2];
kayekss 1:8cf4beca9695 308 default:
kayekss 1:8cf4beca9695 309 return -1;
kayekss 1:8cf4beca9695 310 }
kayekss 1:8cf4beca9695 311 }
kayekss 1:8cf4beca9695 312
kayekss 1:8cf4beca9695 313 int32_t BMPFile::green(uint32_t x, uint32_t y) {
kayekss 1:8cf4beca9695 314 if (x >= width || y >= height) {
kayekss 1:8cf4beca9695 315 return -1;
kayekss 1:8cf4beca9695 316 }
kayekss 1:8cf4beca9695 317 if (!data) {
kayekss 1:8cf4beca9695 318 return -1;
kayekss 1:8cf4beca9695 319 }
kayekss 1:8cf4beca9695 320 switch (colorDepth) {
kayekss 1:8cf4beca9695 321 case 1: // Indexed from palette
kayekss 1:8cf4beca9695 322 return paletteGreen((data[stride * y + x / 8] >> 7 - x % 8) & 0x01);
kayekss 1:8cf4beca9695 323 case 4: // Indexed from palette
kayekss 1:8cf4beca9695 324 return paletteGreen((data[stride * y + x / 2] >> 4 * (1 - x % 2)) & 0x0f);
kayekss 1:8cf4beca9695 325 case 8: // Indexed from palette
kayekss 1:8cf4beca9695 326 return paletteGreen(data[stride * y + x]);
kayekss 1:8cf4beca9695 327 case 16: // BGR565 (bbbbbggg:gggrrrrr)
kayekss 3:be3e831a86c1 328 return ((data[stride * y + 2 * x] & 0x07) << 3
kayekss 3:be3e831a86c1 329 | data[stride * y + 2 * x + 1] >> 5) * 2;
kayekss 1:8cf4beca9695 330 case 24: // BGR888
kayekss 1:8cf4beca9695 331 return data[stride * y + 3 * x + 1];
kayekss 1:8cf4beca9695 332 case 32: // BGRX8888
kayekss 1:8cf4beca9695 333 return data[stride * y + 4 * x + 1];
kayekss 1:8cf4beca9695 334 default:
kayekss 1:8cf4beca9695 335 return -1;
kayekss 1:8cf4beca9695 336 }
kayekss 1:8cf4beca9695 337 }
kayekss 1:8cf4beca9695 338
kayekss 1:8cf4beca9695 339 int32_t BMPFile::blue(uint32_t x, uint32_t y) {
kayekss 1:8cf4beca9695 340 if (x >= width || y >= height) {
kayekss 1:8cf4beca9695 341 return -1;
kayekss 1:8cf4beca9695 342 }
kayekss 1:8cf4beca9695 343 if (!data) {
kayekss 1:8cf4beca9695 344 return -1;
kayekss 1:8cf4beca9695 345 }
kayekss 1:8cf4beca9695 346 switch (colorDepth) {
kayekss 1:8cf4beca9695 347 case 1: // Indexed from palette
kayekss 1:8cf4beca9695 348 return paletteBlue((data[stride * y + x / 8] >> 7 - x % 8) & 0x01);
kayekss 1:8cf4beca9695 349 case 4: // Indexed from palette
kayekss 1:8cf4beca9695 350 return paletteBlue((data[stride * y + x / 2] >> 4 * (1 - x % 2)) & 0x0f);
kayekss 1:8cf4beca9695 351 case 8: // Indexed from palette
kayekss 1:8cf4beca9695 352 return paletteBlue(data[stride * y + x]);
kayekss 1:8cf4beca9695 353 case 16: // RGB565 (bbbbbggg:gggrrrrr)
kayekss 3:be3e831a86c1 354 return (data[stride * y + 2 * x] >> 3) * 2;
kayekss 1:8cf4beca9695 355 case 24: // BGR888
kayekss 1:8cf4beca9695 356 return data[stride * y + 3 * x];
kayekss 1:8cf4beca9695 357 case 32: // BGRX8888
kayekss 1:8cf4beca9695 358 return data[stride * y + 4 * x];
kayekss 1:8cf4beca9695 359 default:
kayekss 1:8cf4beca9695 360 return -1;
kayekss 1:8cf4beca9695 361 }
kayekss 1:8cf4beca9695 362 }