<?php
    /**
     * @author Gasper Kozak
     * @copyright 2007-2011
     **/

    /**
     */
    class WideImage_PaletteImage extends WideImage_Image
    {
        /**
         * Create a palette image.
         *
         * @param int $width
         * @param int $height
         *
         * @return WideImage_PaletteImage
         */
        public static function create($width, $height)
        {
            if ($width * $height <= 0 || $width < 0) {
                throw new WideImage_InvalidImageDimensionException("Can't create an image with dimensions [$width, $height].");
            }

            return new self(imagecreate($width, $height));
        }

        public function doCreate($width, $height)
        {
            return self::create($width, $height);
        }

        /**
         * (non-PHPdoc).
         *
         * @see WideImage_Image#isTrueColor()
         */
        public function isTrueColor()
        {
            return false;
        }

        /**
         * (non-PHPdoc).
         *
         * @see WideImage_Image#asPalette($nColors, $dither, $matchPalette)
         */
        public function asPalette($nColors = 255, $dither = null, $matchPalette = true)
        {
            return $this->copy();
        }

        /**
         * Returns a copy of the image.
         * 
         * @param $trueColor True if the new image should be truecolor
         *
         * @return WideImage_Image
         */
        protected function copyAsNew($trueColor = false)
        {
            $width = $this->getWidth();
            $height = $this->getHeight();

            if ($trueColor) {
                $new = WideImage_TrueColorImage::create($width, $height);
            } else {
                $new = self::create($width, $height);
            }

            // copy transparency of source to target
            if ($this->isTransparent()) {
                $rgb = $this->getTransparentColorRGB();
                if (is_array($rgb)) {
                    $tci = $new->allocateColor($rgb['red'], $rgb['green'], $rgb['blue']);
                    $new->fill(0, 0, $tci);
                    $new->setTransparentColor($tci);
                }
            }

            imagecopy($new->getHandle(), $this->handle, 0, 0, 0, 0, $width, $height);

            return $new;
        }

        /**
         * (non-PHPdoc).
         *
         * @see WideImage_Image#asTrueColor()
         */
        public function asTrueColor()
        {
            $width = $this->getWidth();
            $height = $this->getHeight();
            $new = WideImage::createTrueColorImage($width, $height);
            if ($this->isTransparent()) {
                $new->copyTransparencyFrom($this);
            }
            if (!imagecopy($new->getHandle(), $this->handle, 0, 0, 0, 0, $width, $height)) {
                throw new WideImage_GDFunctionResultException('imagecopy() returned false');
            }

            return $new;
        }

        /**
         * (non-PHPdoc).
         *
         * @see WideImage_Image#getChannels()
         */
        public function getChannels()
        {
            $args = func_get_args();
            if (count($args) == 1 && is_array($args[0])) {
                $args = $args[0];
            }

            return WideImage_OperationFactory::get('CopyChannelsPalette')->execute($this, $args);
        }

        /**
         * (non-PHPdoc).
         *
         * @see WideImage_Image#copyNoAlpha()
         */
        public function copyNoAlpha()
        {
            return WideImage_Image::loadFromString($this->asString('png'));
        }
    }
