BFI_Image_Editor_GD_1_3()
Methods
- _opacity — BFI_Image_Editor_GD_1_3::_opacity( $image, $opacity ) Source includes/libraries/bfi-thumb/bfi-thumb.php protected function _opacity( $image, $opacity ) { if ( ! function_exists( 'imagealphablending' ) || ! function_exists( 'imagecolorat' ) || ! function_exists( 'imagecolorallocatealpha' ) || ! function_exists( 'imagesetpixel' ) ) { return false; } // get image width and height $w = imagesx( $image ); $h = imagesy( $image ); // turn […]
- _opacity — BFI_Image_Editor_GD_1_3::_opacity( $image, $opacity ) Source includes/libraries/bfi-thumb/bfi-thumb.php protected function _opacity( $image, $opacity ) { if ( ! function_exists( 'imagealphablending' ) || ! function_exists( 'imagecolorat' ) || ! function_exists( 'imagecolorallocatealpha' ) || ! function_exists( 'imagesetpixel' ) ) { return false; } // get image width and height $w = imagesx( $image ); $h = imagesy( $image ); // turn […]
- _opacity — BFI_Image_Editor_GD_1_3::_opacity( $image, $opacity ) Source includes/libraries/bfi-thumb/bfi-thumb.php protected function _opacity( $image, $opacity ) { if ( ! function_exists( 'imagealphablending' ) || ! function_exists( 'imagecolorat' ) || ! function_exists( 'imagecolorallocatealpha' ) || ! function_exists( 'imagesetpixel' ) ) { return false; } // get image width and height $w = imagesx( $image ); $h = imagesy( $image ); // turn […]
- colorize — Tints the image a different color
- colorize — Tints the image a different color
- colorize — Tints the image a different color
- grayscale — Makes the image grayscale
- grayscale — Makes the image grayscale
- grayscale — Makes the image grayscale
- negate — Negates the image
Source
includes/libraries/bfi-thumb/bfi-thumb.php
class BFI_Image_Editor_GD_1_3 extends WP_Image_Editor_GD { /** Rotates current image counter-clockwise by $angle. * Ported from image-edit.php * Added presevation of alpha channels * * @since 3.5.0 * @access public * * @param float $angle * * @return boolean|WP_Error */ public function rotate( $angle ) { if ( function_exists( 'imagerotate' ) ) { $rotated = imagerotate( $this->image, $angle, 0 ); // Add alpha blending imagealphablending( $rotated, true ); imagesavealpha( $rotated, true ); if ( is_resource( $rotated ) ) { imagedestroy( $this->image ); $this->image = $rotated; $this->update_size(); return true; } } return new WP_Error( 'image_rotate_error', 'Image rotate failed.', $this->file ); } /** Changes the opacity of the image * * @supports 3.5.1 * @access public * * @param float $opacity (0.0-1.0) * * @return boolean|WP_Error */ public function opacity( $opacity ) { $opacity /= 100; $filtered = $this->_opacity( $this->image, $opacity ); if ( is_resource( $filtered ) ) { // imagedestroy($this->image); $this->image = $filtered; return true; } return new WP_Error( 'image_opacity_error', 'Image opacity change failed.', $this->file ); } // from: http://php.net/manual/en/function.imagefilter.php // params: image resource id, opacity (eg. 0.0-1.0) protected function _opacity( $image, $opacity ) { if ( ! function_exists( 'imagealphablending' ) || ! function_exists( 'imagecolorat' ) || ! function_exists( 'imagecolorallocatealpha' ) || ! function_exists( 'imagesetpixel' ) ) { return false; } // get image width and height $w = imagesx( $image ); $h = imagesy( $image ); // turn alpha blending off imagealphablending( $image, false ); // find the most opaque pixel in the image (the one with the smallest alpha value) $minalpha = 127; for ( $x = 0; $x < $w; $x++ ) { for ( $y = 0; $y < $h; $y++ ) { $alpha = ( imagecolorat( $image, $x, $y ) >> 24 ) & 0xFF; if ( $alpha < $minalpha ) { $minalpha = $alpha; } } } // loop through image pixels and modify alpha for each for ( $x = 0; $x < $w; $x++ ) { for ( $y = 0; $y < $h; $y++ ) { // get current alpha value (represents the TANSPARENCY!) $colorxy = imagecolorat( $image, $x, $y ); $alpha = ( $colorxy >> 24 ) & 0xFF; // calculate new alpha if ( $minalpha !== 127 ) { $alpha = 127 + 127 * $opacity * ( $alpha - 127 ) / ( 127 - $minalpha ); } else { $alpha += 127 * $opacity; } // get the color index with new alpha $alphacolorxy = imagecolorallocatealpha( $image, ( $colorxy >> 16 ) & 0xFF, ( $colorxy >> 8 ) & 0xFF, $colorxy & 0xFF, $alpha ); // set pixel with the new color + opacity if ( ! imagesetpixel( $image, $x, $y, $alphacolorxy ) ) { return false; } } } imagesavealpha( $image, true ); return $image; } /** Tints the image a different color * * @supports 3.5.1 * @access public * * @param string hex color e.g. #ff00ff * * @return boolean|WP_Error */ public function colorize( $hexColor ) { if ( function_exists( 'imagefilter' ) && function_exists( 'imagesavealpha' ) && function_exists( 'imagealphablending' ) ) { $hexColor = preg_replace( '#^\##', '', $hexColor ); $r = hexdec( substr( $hexColor, 0, 2 ) ); $g = hexdec( substr( $hexColor, 2, 2 ) ); $b = hexdec( substr( $hexColor, 2, 2 ) ); imagealphablending( $this->image, false ); if ( imagefilter( $this->image, IMG_FILTER_COLORIZE, $r, $g, $b, 0 ) ) { imagesavealpha( $this->image, true ); return true; } } return new WP_Error( 'image_colorize_error', 'Image color change failed.', $this->file ); } /** Makes the image grayscale * * @supports 3.5.1 * @access public * * @return boolean|WP_Error */ public function grayscale() { if ( function_exists( 'imagefilter' ) ) { if ( imagefilter( $this->image, IMG_FILTER_GRAYSCALE ) ) { return true; } } return new WP_Error( 'image_grayscale_error', 'Image grayscale failed.', $this->file ); } /** Negates the image * * @supports 3.5.1 * @access public * * @return boolean|WP_Error */ public function negate() { if ( function_exists( 'imagefilter' ) ) { if ( imagefilter( $this->image, IMG_FILTER_NEGATE ) ) { return true; } } return new WP_Error( 'image_negate_error', 'Image negate failed.', $this->file ); } }