PhutilSpriteSheet.php
4f9915ecac81stable

PhutilSpriteSheet.php
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			<?php

			/**
			* NOTE: This is very new and unstable.
			*/
			final class PhutilSpriteSheet {

			private $sprites = array();
			private $sources = array();
			private $cssHeader;
			private $generated;

			private $css;
			private $image;

			public function addSprite(PhutilSprite $sprite) {
			$this->generated = false;
			$this->sprites[] = $sprite;
			return $this;
			}

			public function setCSSHeader($header) {
			$this->generated = false;
			$this->cssHeader = $header;
			return $this;
			}

			private function generate() {
			if ($this->generated) {
			return;
			}

			$css = array();
			if ($this->cssHeader) {
			$css[] = $this->cssHeader;
			}

			$vertical_margin = 1;

			$out_w = 0;
			$out_h = 0;
			foreach ($this->sprites as $sprite) {
			$out_w = max($out_w, $sprite->getSourceW());
			$out_h += $sprite->getSourceH();

			$out_h += $vertical_margin;
			}

			$out = imagecreatetruecolor($out_w, $out_h);
			imagesavealpha($out, true);
			imagefill($out, 0, 0, imagecolorallocatealpha($out, 0, 0, 0, 127));

			$pos_x = 0;
			$pos_y = 0;
			foreach ($this->sprites as $sprite) {
			$src = $this->loadSource($sprite);

			imagecopy(
			$out, $src,
			$pos_x, $pos_y, $sprite->getSourceX(), $sprite->getSourceY(),
			$sprite->getSourceW(), $sprite->getSourceH());

			$rule = $sprite->getTargetCSS();
			$cssx = (-$pos_x).'px';
			$cssy = (-$pos_y).'px';

			$css[] = "{$rule} {\n background-position: {$cssx} {$cssy};\n}";
			$pos_y += $sprite->getSourceH();
			$pos_y += $vertical_margin;
			}

			$this->image = $out;
			$this->css = implode("\n\n", $css)."\n";
			$this->generated = true;
			}

			public function generateImage($path) {
			$this->generate();
			$this->log("Writing sprite '{$path}'...");
			imagepng($this->image, $path);
			}

			public function generateCSS($path) {
			$this->generate();
			$this->log("Writing CSS '{$path}'...");
			Filesystem::writeFile($path, $this->css);
			}

			private function log($message) {
			echo $message."\n";
			}

			private function loadSource(PhutilSprite $sprite) {
			$file = $sprite->getSourceFile();
			if (empty($this->sources[$file])) {
			$data = Filesystem::readFile($file);
			$this->sources[$file] = imagecreatefromstring($data);
			}
			return $this->sources[$file];
			}

			}

libphutil/src/sprites/PhutilSpriteSheet.php4f9915ecac81stable

PhutilSpriteSheet.phpView Options

libphutil/src/sprites/PhutilSpriteSheet.php
4f9915ecac81stable

PhutilSpriteSheet.php
View Options