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PhutilSpriteSheet.php
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Sat, Jun 28, 12:25

PhutilSpriteSheet.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* 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];
}
}

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