phpthumb.filters.php

是一款免费的轻量级论坛软件

<?php
class phpthumb_filters {

	function ApplyMask(&$gdimg_mask, &$gdimg_image) {
		if (phpthumb_functions::gd_version() < 2) {
			//$this->DebugMessage('Skipping ApplyMask() because gd_version is "'.phpthumb_functions::gd_version().'"', __FILE__, __LINE__);
			return false;
		}
		if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.2', '>=')) {

			//$this->DebugMessage('Using alpha ApplyMask() technique', __FILE__, __LINE__);
			if ($gdimg_mask_resized = phpthumb_functions::ImageCreateFunction(ImageSX($gdimg_image), ImageSY($gdimg_image))) {

				ImageCopyResampled($gdimg_mask_resized, $gdimg_mask, 0, 0, 0, 0, ImageSX($gdimg_image), ImageSY($gdimg_image), ImageSX($gdimg_mask), ImageSY($gdimg_mask));
				if ($gdimg_mask_blendtemp = phpthumb_functions::ImageCreateFunction(ImageSX($gdimg_image), ImageSY($gdimg_image))) {

					$color_background = ImageColorAllocate($gdimg_mask_blendtemp, 0, 0, 0);
					ImageFilledRectangle($gdimg_mask_blendtemp, 0, 0, ImageSX($gdimg_mask_blendtemp), ImageSY($gdimg_mask_blendtemp), $color_background);
					ImageAlphaBlending($gdimg_mask_blendtemp, false);
					if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.2', '>=')) {
						ImageSaveAlpha($gdimg_mask_blendtemp, true);
					}
					for ($x = 0; $x < ImageSX($gdimg_image); $x++) {
						for ($y = 0; $y < ImageSY($gdimg_image); $y++) {
							//$RealPixel = phpthumb_functions::GetPixelColor($gdimg_mask_blendtemp, $x, $y);
							$RealPixel = phpthumb_functions::GetPixelColor($gdimg_image, $x, $y);
							$MaskPixel = phpthumb_functions::GrayscalePixel(phpthumb_functions::GetPixelColor($gdimg_mask_resized, $x, $y));
							$MaskAlpha = 127 - (floor($MaskPixel['red'] / 2) * (1 - ($RealPixel['alpha'] / 127)));
							$newcolor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_mask_blendtemp, $RealPixel['red'], $RealPixel['green'], $RealPixel['blue'], $MaskAlpha);
							ImageSetPixel($gdimg_mask_blendtemp, $x, $y, $newcolor);
						}
					}
					ImageAlphaBlending($gdimg_image, false);
					if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.2', '>=')) {
						ImageSaveAlpha($gdimg_image, true);
					}
					ImageCopy($gdimg_image, $gdimg_mask_blendtemp, 0, 0, 0, 0, ImageSX($gdimg_mask_blendtemp), ImageSY($gdimg_mask_blendtemp));
					ImageDestroy($gdimg_mask_blendtemp);

				} else {
					//$this->DebugMessage('ImageCreateFunction() failed', __FILE__, __LINE__);
				}
				ImageDestroy($gdimg_mask_resized);

			} else {
				//$this->DebugMessage('ImageCreateFunction() failed', __FILE__, __LINE__);
			}

		} else {
			// alpha merging requires PHP v4.3.2+
			//$this->DebugMessage('Skipping ApplyMask() technique because PHP is v"'.phpversion().'"', __FILE__, __LINE__);
		}
		return true;
	}


	function Bevel(&$gdimg, $width, $hexcolor1, $hexcolor2) {
		$width     = ($width     ? $width     : 5);
		$hexcolor1 = ($hexcolor1 ? $hexcolor1 : 'FFFFFF');
		$hexcolor2 = ($hexcolor2 ? $hexcolor2 : '000000');

		ImageAlphaBlending($gdimg, true);
		for ($i = 0; $i < $width; $i++) {
			$alpha = round(($i / $width) * 127);
			$color1[$i] = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor1, false, $alpha);
			$color2[$i] = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor2, false, $alpha);

			ImageLine($gdimg,                   $i,                   $i,                   $i, ImageSY($gdimg) - $i, $color1[$i]); // left
			ImageLine($gdimg,                   $i,                   $i, ImageSX($gdimg) - $i,                   $i, $color1[$i]); // top
			ImageLine($gdimg, ImageSX($gdimg) - $i, ImageSY($gdimg) - $i, ImageSX($gdimg) - $i,                   $i, $color2[$i]); // right
			ImageLine($gdimg, ImageSX($gdimg) - $i, ImageSY($gdimg) - $i,                   $i, ImageSY($gdimg) - $i, $color2[$i]); // bottom
		}
		return true;
	}


	function Blur(&$gdimg, $radius) {
		// Taken from Torstein H鴑si's phrevosharpMask (see phpthumb.unsharp.php)

		$radius = round(max(0, min($radius, 50)) * 2);
		if (!$radius) {
			return false;
		}

		$w = ImageSX($gdimg);
		$h = ImageSY($gdimg);
		if ($imgBlur = ImageCreateTrueColor($w, $h)) {
			// Gaussian blur matrix:
			//	1	2	1
			//	2	4	2
			//	1	2	1

			// Move copies of the image around one pixel at the time and merge them with weight
			// according to the matrix. The same matrix is simply repeated for higher radii.
			for ($i = 0; $i < $radius; $i++)	{
				ImageCopy     ($imgBlur, $gdimg, 0, 0, 1, 1, $w - 1, $h - 1);            // up left
				ImageCopyMerge($imgBlur, $gdimg, 1, 1, 0, 0, $w,     $h,     50.00000);  // down right
				ImageCopyMerge($imgBlur, $gdimg, 0, 1, 1, 0, $w - 1, $h,     33.33333);  // down left
				ImageCopyMerge($imgBlur, $gdimg, 1, 0, 0, 1, $w,     $h - 1, 25.00000);  // up right
				ImageCopyMerge($imgBlur, $gdimg, 0, 0, 1, 0, $w - 1, $h,     33.33333);  // left
				ImageCopyMerge($imgBlur, $gdimg, 1, 0, 0, 0, $w,     $h,     25.00000);  // right
				ImageCopyMerge($imgBlur, $gdimg, 0, 0, 0, 1, $w,     $h - 1, 20.00000);  // up
				ImageCopyMerge($imgBlur, $gdimg, 0, 1, 0, 0, $w,     $h,     16.666667); // down
				ImageCopyMerge($imgBlur, $gdimg, 0, 0, 0, 0, $w,     $h,     50.000000); // center
				ImageCopy     ($gdimg, $imgBlur, 0, 0, 0, 0, $w,     $h);
			}
			return true;
		}
		return false;
	}


	function BlurGaussian(&$gdimg) {
		if (phpthumb_functions::version_compare_replacement(phpversion(), '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
			if (ImageFilter($gdimg, IMG_FILTER_GAUSSIAN_BLUR)) {
				return true;
			}
			$this->DebugMessage('FAILED: ImageFilter($gdimg, IMG_FILTER_GAUSSIAN_BLUR)', __FILE__, __LINE__);
			// fall through and try it the hard way
		}
		// currently not implemented "the hard way"
		$this->DebugMessage('FAILED: phpthumb_filters::BlurGaussian($gdimg) [function not implemented]', __FILE__, __LINE__);
		return false;
	}


	function BlurSelective(&$gdimg) {
		if (phpthumb_functions::version_compare_replacement(phpversion(), '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
			if (ImageFilter($gdimg, IMG_FILTER_SELECTIVE_BLUR)) {
				return true;
			}
			$this->DebugMessage('FAILED: ImageFilter($gdimg, IMG_FILTER_SELECTIVE_BLUR)', __FILE__, __LINE__);
			// fall through and try it the hard way
		}
		// currently not implemented "the hard way"
		$this->DebugMessage('FAILED: phpthumb_filters::BlurSelective($gdimg) [function not implemented]', __FILE__, __LINE__);
		return false;
	}


	function Brightness(&$gdimg, $amount=0) {
		if ($amount == 0) {
			return true;
		}
		$amount = max(-255, min(255, $amount));

		if (phpthumb_functions::version_compare_replacement(phpversion(), '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
			if (ImageFilter($gdimg, IMG_FILTER_BRIGHTNESS, $amount)) {
				return true;
			}
			$this->DebugMessage('FAILED: ImageFilter($gdimg, IMG_FILTER_BRIGHTNESS, '.$amount.')', __FILE__, __LINE__);
			// fall through and try it the hard way
		}

		$scaling = (255 - abs($amount)) / 255;
		$baseamount = (($amount > 0) ? $amount : 0);
		for ($x = 0; $x < ImageSX($gdimg); $x++) {
			for ($y = 0; $y < ImageSY($gdimg); $y++) {
				$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
				foreach ($OriginalPixel as $key => $value) {
					$NewPixel[$key] = round($baseamount + ($OriginalPixel[$key] * $scaling));
				}
				$newColor = ImageColorAllocate($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue']);
				ImageSetPixel($gdimg, $x, $y, $newColor);
			}
		}
		return true;
	}


	function Contrast(&$gdimg, $amount=0) {
		if ($amount == 0) {
			return true;
		}
		$amount = max(-255, min(255, $amount));

		if (phpthumb_functions::version_compare_replacement(phpversion(), '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
			if (ImageFilter($gdimg, IMG_FILTER_CONTRAST, $amount)) {
				return true;
			}
			$this->DebugMessage('FAILED: ImageFilter($gdimg, IMG_FILTER_CONTRAST, '.$amount.')', __FILE__, __LINE__);
			// fall through and try it the hard way
		}

		if ($amount > 0) {
			$scaling = 1 + ($amount / 255);
		} else {
			$scaling = (255 - abs($amount)) / 255;
		}
		for ($x = 0; $x < ImageSX($gdimg); $x++) {
			for ($y = 0; $y < ImageSY($gdimg); $y++) {
				$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
				foreach ($OriginalPixel as $key => $value) {
					$NewPixel[$key] = min(255, max(0, round($OriginalPixel[$key] * $scaling)));
				}
				$newColor = ImageColorAllocate($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue']);
				ImageSetPixel($gdimg, $x, $y, $newColor);
			}
		}
	}


	function Colorize(&$gdimg, $amount, $targetColor) {
		$amount      = (is_numeric($amount)                          ? $amount      : 25);
		$targetColor = (phpthumb_functions::IsHexColor($targetColor) ? $targetColor : 'gray');

		if ($amount == 0) {
			return true;
		}

		if (phpthumb_functions::version_compare_replacement(phpversion(), '5.0.0', '>=') && phpthumb_functions::gd_is_bundled()) {
			if ($targetColor == 'gray') {
				$targetColor = '808080';
			}
			$r = substr($targetColor, 0, 2);
			$g = substr($targetColor, 2, 2);
			$b = substr($targetColor, 4, 2);
			if (ImageFilter($gdimg, IMG_FILTER_COLORIZE, $r, $g, $b)) {
				return true;
			}
			$this->DebugMessage('FAILED: ImageFilter($gdimg, IMG_FILTER_COLORIZE)', __FILE__, __LINE__);
			// fall through and try it the hard way
		}

		// overridden below for grayscale
		if ($targetColor != 'gray') {
			$TargetPixel['red']   = hexdec(substr($targetColor, 0, 2));
			$TargetPixel['green'] = hexdec(substr($targetColor, 2, 2));
			$TargetPixel['blue']  = hexdec(substr($targetColor, 4, 2));
		}

		for ($x = 0; $x < ImageSX($gdimg); $x++) {
			for ($y = 0; $y < ImageSY($gdimg); $y++) {
				$OriginalPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
				if ($targetColor == 'gray') {
					$TargetPixel = phpthumb_functions::GrayscalePixel($OriginalPixel);
				}
				foreach ($TargetPixel as $key => $value) {
					$NewPixel[$key] = round(max(0, min(255, ($OriginalPixel[$key] * ((100 - $amount) / 100)) + ($TargetPixel[$key] * ($amount / 100)))));
				}
				//$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue'], $OriginalPixel['alpha']);
				$newColor = ImageColorAllocate($gdimg, $NewPixel['red'], $NewPixel['green'], $NewPixel['blue']);
				ImageSetPixel($gdimg, $x, $y, $newColor);
			}
		}
		return true;
	}


	function Desaturate(&$gdimg, $amount, $color='') {
		if ($amount == 0) {
			return true;
		}
		return phpthumb_filters::Colorize($gdimg, $amount, (phpthumb_functions::IsHexColor($color) ? $color : 'gray'));
	}


	function DropShadow(&$gdimg, $distance, $width, $hexcolor, $angle, $fade) {
		if (phpthumb_functions::gd_version() < 2) {
			return false;
		}
		$distance = ($distance ? $distance : 10);
		$width    = ($width    ? $width    : 10);
		$hexcolor = ($hexcolor ? $hexcolor : '000000');
		$angle    = ($angle    ? $angle    : 225);
		$fade     = ($fade     ? $fade     : 1);

		$width_shadow  = cos(deg2rad($angle)) * ($distance + $width);
		$height_shadow = sin(deg2rad($angle)) * ($distance + $width);

		$scaling = min(ImageSX($gdimg) / (ImageSX($gdimg) + abs($width_shadow)), ImageSY($gdimg) / (ImageSY($gdimg) + abs($height_shadow)));

		for ($i = 0; $i < $width; $i++) {
			$WidthAlpha[$i] = (abs(($width / 2) - $i) / $width) * $fade;
			$Offset['x'] = cos(deg2rad($angle)) * ($distance + $i);
			$Offset['y'] = sin(deg2rad($angle)) * ($distance + $i);
		}

		$tempImageWidth  = ImageSX($gdimg)  + abs($Offset['x']);
		$tempImageHeight = ImageSY($gdimg) + abs($Offset['y']);

		if ($gdimg_dropshadow_temp = phpthumb_functions::ImageCreateFunction($tempImageWidth, $tempImageHeight)) {

			ImageAlphaBlending($gdimg_dropshadow_temp, false);
			if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.2', '>=')) {
				ImageSaveAlpha($gdimg_dropshadow_temp, true);
			}
			$transparent1 = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg_dropshadow_temp, 0, 0, 0, 127);
			ImageFill($gdimg_dropshadow_temp, 0, 0, $transparent1);

			for ($x = 0; $x < ImageSX($gdimg); $x++) {
				for ($y = 0; $y < ImageSY($gdimg); $y++) {
					$PixelMap[$x][$y] = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
				}
			}
			for ($x = 0; $x < $tempImageWidth; $x++) {
				for ($y = 0; $y < $tempImageHeight; $y++) {
					//for ($i = 0; $i < $width; $i++) {
					for ($i = 0; $i < 1; $i++) {
						if (!isset($PixelMap[$x][$y]['alpha']) || ($PixelMap[$x][$y]['alpha'] > 0)) {
							if (isset($PixelMap[$x + $Offset['x']][$y + $Offset['y']]['alpha']) && ($PixelMap[$x + $Offset['x']][$y + $Offset['y']]['alpha'] < 127)) {
								$thisColor = phpthumb_functions::ImageHexColorAllocate($gdimg, $hexcolor, false, $PixelMap[$x + $Offset['x']][$y + $Offset['y']]['alpha']);
								ImageSetPixel($gdimg_dropshadow_temp, $x, $y, $thisColor);
							}
						}