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PHP uses the GD library to generate images in bmp format (imagebmp)

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Release： 2016-07-25 09:07:18
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  3. /**

  4. * Create bmp format pictures
  5. *
  6. * @author: legend
  7. * @description: create Bitmap-File with GD library
  8. * @version: 0.1
  9. *
  10. * @param resource $im image resource
  11. * @param string $filename If you want to save as a file, please specify the file name. If it is empty, it will be output directly in the browser
  12. * @param integer $bit image quality (1, 4, 8, 16, 24, 32 bits)
  13. * @param integer $compression compression Mode, 0 means no compression, 1 uses RLE8 compression algorithm for compression
  14. *
  15. * @return integer
  16. */
  17. function imagebmp(&$im, $filename = ”, $bit = 8, $compression = 0)
  18. {
  19. if (!in_array($bit, array(1, 4, 8, 16, 24, 32)))
  20. {
  21. $bit = 8;
  22. }
  23. else if ($bit == 32) // todo:32 bit
  24. {
  25. $bit = 24;
  26. }

  27. $bits = pow(2, $bit);

  28. // 调整调色板

  29. imagetruecolortopalette($im, true, $bits);
  30. $width = imagesx($im);
  31. $height = imagesy($im);
  32. $colors_num = imagecolorstotal($im);

  33. if ($bit <= 8)

  34. {
  35. // 颜色索引
  36. $rgb_quad = ”;
  37. for ($i = 0; $i < $colors_num; $i ++)
  38. {
  39. $colors = imagecolorsforindex($im, $i);
  40. $rgb_quad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . “
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php使用GD库生成bmp格式的图片(imagebmp)
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