PHP WideImage_Image::isTransparent方法代码示例

 /**
  * Returns rotated image
  *
  * @param WideImage_Image $image
  * @param numeric $angle
  * @param int $bgColor
  * @param bool $ignoreTransparent
  * @return WideImage_Image
  */
 function execute($image, $angle, $bgColor, $ignoreTransparent)
 {
     $angle = -floatval($angle);
     if ($angle < 0) {
         $angle = 360 + $angle;
     }
     $angle = $angle % 360;
     if ($angle == 0) {
         return $image->copy();
     }
     if ($bgColor === null) {
         if ($image->isTransparent()) {
             $bgColor = $image->getTransparentColor();
         } else {
             $tc = array('red' => 255, 'green' => 255, 'blue' => 255, 'alpha' => 127);
             if ($image->isTrueColor()) {
                 $bgColor = $image->getExactColorAlpha($tc);
                 if ($bgColor == -1) {
                     $bgColor = $image->allocateColorAlpha($tc);
                 }
             } else {
                 $bgColor = $image->getExactColor($tc);
                 if ($bgColor == -1) {
                     $bgColor = $image->allocateColor($tc);
                 }
             }
         }
     }
     return new WideImage_TrueColorImage(imagerotate($image->getHandle(), $angle, $bgColor, $ignoreTransparent));
 }

 /**
  * Returns a cropped image
  *
  * @param WideImage_Image $img
  * @param smart_coordinate $left
  * @param smart_coordinate $top
  * @param smart_coordinate $width
  * @param smart_coordinate $height
  * @return WideImage_Image
  */
 function execute($img, $left, $top, $width, $height)
 {
     $width = WideImage_Coordinate::fix($width, $img->getWidth(), $width);
     $height = WideImage_Coordinate::fix($height, $img->getHeight(), $height);
     $left = WideImage_Coordinate::fix($left, $img->getWidth(), $width);
     $top = WideImage_Coordinate::fix($top, $img->getHeight(), $height);
     if ($left < 0) {
         $width = $left + $width;
         $left = 0;
     }
     if ($width > $img->getWidth() - $left) {
         $width = $img->getWidth() - $left;
     }
     if ($top < 0) {
         $height = $top + $height;
         $top = 0;
     }
     if ($height > $img->getHeight() - $top) {
         $height = $img->getHeight() - $top;
     }
     if ($width <= 0 || $height <= 0) {
         throw new WideImage_Exception("Can't crop outside of an image.");
     }
     $new = $img->doCreate($width, $height);
     if ($img->isTransparent() || $img instanceof WideImage_PaletteImage) {
         $new->copyTransparencyFrom($img);
         imagecopyresized($new->getHandle(), $img->getHandle(), 0, 0, $left, $top, $width, $height, $width, $height);
     } else {
         $new->alphaBlending(false);
         $new->saveAlpha(true);
         imagecopyresampled($new->getHandle(), $img->getHandle(), 0, 0, $left, $top, $width, $height, $width, $height);
     }
     return $new;
 }

 /**
  * Returns an image with a resized canvas
  * 
  * The image is filled with $color. Use $scale to determine, when to resize.
  *
  * @param WideImage_Image $img
  * @param smart_coordinate $width
  * @param smart_coordinate $height
  * @param smart_coordinate $left
  * @param smart_coordinate $top
  * @param int $color
  * @param string $scale 'up', 'down', 'any'
  * @return WideImage_Image
  */
 function execute($img, $width, $height, $left, $top, $color, $scale)
 {
     $new_width = WideImage_Coordinate::fix($width, $img->getWidth());
     $new_height = WideImage_Coordinate::fix($width, $img->getHeight());
     if ($scale == 'down') {
         $new_width = min($new_width, $img->getWidth());
         $new_height = min($new_height, $img->getHeight());
     } elseif ($scale == 'up') {
         $new_width = max($new_width, $img->getWidth());
         $new_height = max($new_height, $img->getHeight());
     }
     $new = WideImage::createTrueColorImage($new_width, $new_height);
     if ($img->isTrueColor()) {
         if ($color === null) {
             $color = $new->allocateColorAlpha(0, 0, 0, 127);
         }
     } else {
         imagepalettecopy($new->getHandle(), $img->getHandle());
         if ($color === null) {
             if ($img->isTransparent()) {
                 $new->copyTransparencyFrom($img);
                 $tc_rgb = $img->getTransparentColorRGB();
                 $color = $new->allocateColorAlpha($tc_rgb);
             } else {
                 $color = $new->allocateColorAlpha(255, 0, 127, 127);
             }
             imagecolortransparent($new->getHandle(), $color);
         }
     }
     $new->fill(0, 0, $color);
     $x = WideImage_Coordinate::fix($left, $new->getWidth(), $img->getWidth());
     $y = WideImage_Coordinate::fix($top, $new->getHeight(), $img->getHeight());
     $img->copyTo($new, $x, $y);
     return $new;
 }

 /**
  * Returns an image with a resized canvas
  * 
  * The image is filled with $color. Use $scale to determine, when to resize.
  *
  * @param WideImage_Image $img
  * @param smart_coordinate $width
  * @param smart_coordinate $height
  * @param smart_coordinate $left
  * @param smart_coordinate $top
  * @param int $color
  * @param string $scale 'up', 'down', 'any'
  * @param boolean $merge
  * @return WideImage_Image
  */
 function execute($img, $width, $height, $left, $top, $color, $scale, $merge)
 {
     $new_width = WideImage_Coordinate::fix($width, $img->getWidth());
     $new_height = WideImage_Coordinate::fix($height, $img->getHeight());
     if ($scale == 'down') {
         $new_width = min($new_width, $img->getWidth());
         $new_height = min($new_height, $img->getHeight());
     } elseif ($scale == 'up') {
         $new_width = max($new_width, $img->getWidth());
         $new_height = max($new_height, $img->getHeight());
     }
     $new = WideImage::createTrueColorImage($new_width, $new_height);
     if ($img->isTrueColor()) {
         if ($color === null) {
             $color = $new->allocateColorAlpha(0, 0, 0, 127);
         }
     } else {
         imagepalettecopy($new->getHandle(), $img->getHandle());
         if ($img->isTransparent()) {
             $new->copyTransparencyFrom($img);
             $tc_rgb = $img->getTransparentColorRGB();
             $t_color = $new->allocateColorAlpha($tc_rgb);
         }
         if ($color === null) {
             if ($img->isTransparent()) {
                 $color = $t_color;
             } else {
                 $color = $new->allocateColorAlpha(255, 0, 127, 127);
             }
             imagecolortransparent($new->getHandle(), $color);
         }
     }
     $new->fill(0, 0, $color);
     $x = WideImage_Coordinate::fix($left, $new->getWidth(), $img->getWidth());
     $y = WideImage_Coordinate::fix($top, $new->getHeight(), $img->getHeight());
     // blending for truecolor images
     if ($img->isTrueColor()) {
         $new->alphaBlending($merge);
     }
     // not-blending for palette images
     if (!$merge && !$img->isTrueColor() && isset($t_color)) {
         $new->getCanvas()->filledRectangle($x, $y, $x + $img->getWidth(), $y + $img->getHeight(), $t_color);
     }
     $img->copyTo($new, $x, $y);
     return $new;
 }

 /**
  * Returns a greyscale copy of an image
  *
  * @param WideImage_Image $image
  * @return WideImage_Image
  */
 function execute($image)
 {
     $palette = $image instanceof WideImage_PaletteImage;
     $transparent = $image->isTransparent();
     if ($palette && $transparent) {
         $tci = $image->getTransparentColor();
     }
     $new = $image->asTrueColor();
     imagefilter($new->getHandle(), IMG_FILTER_GRAYSCALE);
     if ($palette) {
         $new = $new->asPalette();
         if ($transparent) {
             $new->setTransparentColor($tci);
         }
     }
     return $new;
 }

 /**
  * Returns a greyscale copy of an image
  *
  * @param WideImage_Image $image
  * @return WideImage_Image
  */
 function execute($image)
 {
     $palette = !$image->isTrueColor();
     $transparent = $image->isTransparent();
     if ($palette && $transparent) {
         $tcrgb = $image->getTransparentColorRGB();
     }
     $new = $image->asTrueColor();
     if (!imagefilter($new->getHandle(), IMG_FILTER_NEGATE)) {
         throw new WideImage_GDFunctionResultException("imagefilter() returned false");
     }
     if ($palette) {
         $new = $new->asPalette();
         if ($transparent) {
             $irgb = array('red' => 255 - $tcrgb['red'], 'green' => 255 - $tcrgb['green'], 'blue' => 255 - $tcrgb['blue'], 'alpha' => 127);
             // needs imagecolorexactalpha instead of imagecolorexact, otherwise doesn't work on some transparent GIF images
             $new_tci = imagecolorexactalpha($new->getHandle(), $irgb['red'], $irgb['green'], $irgb['blue'], 127);
             $new->setTransparentColor($new_tci);
         }
     }
     return $new;
 }