PHP generated image thumbnails (support: jpeg,git,png,bmp)

Class Thumb { Public function Create ($srcPath, $dstPath, $dstWidth, $dstHeight) { if (!file_exists ($srcPath)) { return false; } @ $srcSize = getimagesize ($srcPath); if (empty ($srcSize)) { return false; } $srcWith = intval ($srcSize [0]); $srcHeight = Intval ($srcSize [1]); If the size of the original picture is larger than the size of the specified thumbnail, the thumbnail is generated or the original file is copied if ($srcWith <= $dstWidth && $srcHeight <= $dstHeight) { return copy ($srcPath, $dstPath); } Read the original picture resource @ $srcImage = Imagecreatefromjpeg ($srcPath); if (empty ($srcImage)) { @ $srcImage = imagecreatefromgif ($srcPath); } if (empty ($srcImage)) { @ $srcImage = imagecreatefrompng ($srcPath); } if (empty ($srcImage)) { @ $srcImage = $this->_imagecreatefrombmp ($srcPath); } if (empty ($srcImage)) { return false; } Gets the size of the thumbnail and creates a new image accordingly $dstSize = $this->_getdstsize ( $srcWith, $srcHeight, $dstWidth, $dstHeight ); @ $dstImage = Imagecreatetruecolor ( $dstSize [' width '], $dstSize [' Height '] ); @imagecopyresampled ( $dstImage, $srcImage, 0, 0, 0, 0, $dstSize [' width '], $dstSize [' Height '], $srcWith, $srcHeight ); Return @imagepng ($srcPath, $dstPath); } Private Function _imagecreatefrombmp ($filePath) { $fileHandle = fopen ($filePath, ' RB '); if (empty ($fileHandle)) { return false; } $file = Unpack ( ' Vfile_type/vfile_size/vreserved/vbitmap_offset ', Fread ($fileHandle, 14) ); if ($file [' file_type ']! = 19778) { return false; } $bmp = Unpack ( ' Vheader_size/vwidth/vheight/vplanes/'. ' vbits_per_pixel/vcompression/vsize_bitmap/'. ' Vhoriz_resolution/vvert_resolution/vcolors_used/vcolors_important ', Fread ($fileHandle, 40) ); $bmp [' colors '] = POW (2, $bmp [' bits_per_pixel ']); if ($bmp [' size_bitmap '] = = 0) { $bmp [' size_bitmap '] = $file [' file_size ']-$file [' Bitmap_offset ']; } $bmp [' bytes_per_pixel '] = $bmp [' Bits_per_pixel ']/8; $bmp [' bytes_per_pixel2 '] = ceil ($bmp [' bytes_per_pixel ']); $bmp [' decal '] = $bmp [' width '] * $bmp [' bytes_per_pixel ']/4; $bmp [' decal ']-= Floor ($bmp [' width '] * $bmp [' bytes_per_pixel ']/4); $bmp [' decal '] = 4-(4 * $bmp [' decal ']); if ($bmp [' decal '] = = 4) { $bmp [' decal '] = 0; } $palette = Array (); if ($bmp [' Colors '] < 16777216) { $palette = Unpack ( ' V '. $bmp [' Colors '], Fread ($fileHandle, $bmp [' colors '] * 4) ); } $image = Fread ($fileHandle, $bmp [' Size_bitmap ']); $vide = chr (0); $res = Imagecreatetruecolor ($bmp [' width '], $bmp [' height ']); $p = 0; $y = $bmp [' height ']-1; while ($y >= 0) { $x = 0; while ($x < $bmp [' width ']) { if ($bmp [' bits_per_pixel '] = = 24) { $color = Unpack (' V ', substr ($image, $p, 3). $vide); } else if ($bmp [' bits_per_pixel '] = = 16) { $color = Unpack (' n ', substr ($image, $p, 2)); $color [1] = $palette [$color [1]+1]; } else if ($bmp [' bits_per_pixel '] = = 8) { $color = Unpack (' n ', $vide. substr ($image, $p, 1)); $color [1] = $palette [$color [1]+1]; } else if ($bmp [' Bits_per_pixel '] ==4) { $color = Unpack (' n ', $vide. substr ($image, Floor ($p), 1)); if (($p * 2)% 2 = = 0) { $color [1] = ($color [1] >> 4); } else { $color [1] = ($color [1] & 0x0F); } $color [1] = $palette [$color [1] + 1]; } else if ($bmp [' bits_per_pixel '] = = 1) { $color = Unpack (' n ', $vide. substr ($image, Floor ($p), 1)); Switch (($p * 8)% 8) { Case 0: $color [1] = ($color [1] >> 7); Break Case 1: $color [1] = ($color [1] & 0x40) >> 6; Break Case 2: $color [1] = ($color [1] & 0x20) >> 5; Break Case 3: $color [1] = ($color [1] & 0x10) >> 4; Break Case 4: $color [1] = ($color [1] & 0x8) >> 3; Break Case 5: $color [1] = ($color [1] & 0x4) >> 2; Break Case 6: $color [1] = ($color [1] & 0x2) >> 1; Break Case 7: $color [1] = ($color [1] & 0x1); Break } $color [1] = $palette [$color [1] + 1]; } else { return false; } Imagesetpixel ($res, $x, $y, $color [1]); $x + +; $p + = $bmp [' Bytes_per_pixel ']; } $y--; $p + = $bmp [' decal ']; } Fclose ($fileHandle); return $res; } Private Function _getdstsize ($srcWith, $srcHeight, $dstWidth, $dstHeight) { $size = Array (' width ' = = $srcWith, ' height ' = $srcHeight); if ($dstWidth > 0 && $dstHeight > 0) { if ($srcWith > 0 && $srcHeight > 0) { if ($srcWith/$srcHeight >= $dstWidth/$dstHeight) { if ($srcWith > $dstWidth) { $size [' width '] = $dstWidth; $size [' height '] = $srcHeight * $dstWidth/$srcWith; } } else { if ($srcHeight > $dstHeight) { $size [' width '] = $srcWith * $dstHeight/$srcHeight; $size [' height '] = $dstHeight; } } } } return $size; } } Copy Code

JPEG, PHP, GIT

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