Add a basic random image generator

Summary: Adds an abstract base class for random image generation. Implements a concrete subclass for generating Mondrian-like images.

Test Plan:
{F40759}
{F40760}
{F40761}
{F40762}
{F40763}

Reviewers: DeedyDas, AnhNhan

Reviewed By: AnhNhan

CC: chad, aran

Differential Revision: https://secure.phabricator.com/D5705

src/__phutil_library_map__.php

@@ -1037,8 +1037,10 @@ phutil_register_library_map(array(
     'PhabricatorLDAPUnknownUserException' => 'applications/auth/ldap/PhabricatorLDAPUnknownUserException.php',
     'PhabricatorLDAPUnlinkController' => 'applications/auth/controller/PhabricatorLDAPUnlinkController.php',
     'PhabricatorLintEngine' => 'infrastructure/lint/PhabricatorLintEngine.php',
+    'PhabricatorLipsumArtist' => 'applications/lipsum/image/PhabricatorLipsumArtist.php',
     'PhabricatorLipsumGenerateWorkflow' => 'applications/lipsum/management/PhabricatorLipsumGenerateWorkflow.php',
     'PhabricatorLipsumManagementWorkflow' => 'applications/lipsum/management/PhabricatorLipsumManagementWorkflow.php',
+    'PhabricatorLipsumMondrianArtist' => 'applications/lipsum/image/PhabricatorLipsumMondrianArtist.php',
     'PhabricatorLiskDAO' => 'infrastructure/storage/lisk/PhabricatorLiskDAO.php',
     'PhabricatorLocalDiskFileStorageEngine' => 'applications/files/engine/PhabricatorLocalDiskFileStorageEngine.php',
     'PhabricatorLocalTimeTestCase' => 'view/__tests__/PhabricatorLocalTimeTestCase.php',
@@ -2739,6 +2741,7 @@ phutil_register_library_map(array(
     'PhabricatorLintEngine' => 'PhutilLintEngine',
     'PhabricatorLipsumGenerateWorkflow' => 'PhabricatorLipsumManagementWorkflow',
     'PhabricatorLipsumManagementWorkflow' => 'PhutilArgumentWorkflow',
+    'PhabricatorLipsumMondrianArtist' => 'PhabricatorLipsumArtist',
     'PhabricatorLiskDAO' => 'LiskDAO',
     'PhabricatorLocalDiskFileStorageEngine' => 'PhabricatorFileStorageEngine',
     'PhabricatorLocalTimeTestCase' => 'PhabricatorTestCase',

src/applications/files/PhabricatorImageTransformer.php

@@ -104,7 +104,7 @@ final class PhabricatorImageTransformer {
       $x,
       $scaled_y);
 
-    return $this->saveImageDataInAnyFormat($img, $file->getMimeType());
+    return self::saveImageDataInAnyFormat($img, $file->getMimeType());
   }
 
   private function crasslyCropTo(PhabricatorFile $file, $top, $left, $w, $h) {
@@ -126,7 +126,7 @@ final class PhabricatorImageTransformer {
       $w, $h,
       $orig_w, $orig_h);
 
-    return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
+    return self::saveImageDataInAnyFormat($dst, $file->getMimeType());
   }
 
 
@@ -141,7 +141,7 @@ final class PhabricatorImageTransformer {
     }
 
     $dst = $this->applyScaleTo($file, $dx, $dy);
-    return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
+    return self::saveImageDataInAnyFormat($dst, $file->getMimeType());
   }
 
   private function getBlankDestinationFile($dx, $dy) {
@@ -254,7 +254,7 @@ final class PhabricatorImageTransformer {
       $sdx, $sdy,
       $x, $y);
 
-    return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
+    return self::saveImageDataInAnyFormat($dst, $file->getMimeType());
   }
 
   private function applyMemeTo(
@@ -314,7 +314,7 @@ final class PhabricatorImageTransformer {
         break;
       }
     }
-    return $this->saveImageDataInAnyFormat($img, $file->getMimeType());
+    return self::saveImageDataInAnyFormat($img, $file->getMimeType());
   }
 
   private function makeImageWithTextBorder($img, $font_size, $x, $y,
@@ -352,7 +352,7 @@ final class PhabricatorImageTransformer {
     );
   }
 
-  private function saveImageDataInAnyFormat($data, $preferred_mime = '') {
+  public static function saveImageDataInAnyFormat($data, $preferred_mime = '') {
     switch ($preferred_mime) {
       case 'image/gif': // Gif doesn't support true color
       case 'image/png':

src/applications/lipsum/image/PhabricatorLipsumArtist.php

@@ -0,0 +1,68 @@
+<?php
+
+abstract class PhabricatorLipsumArtist {
+
+  protected function getHSBColor($h, $s, $b) {
+    if ($s == 0) {
+      $cr = $b;
+      $cg = $b;
+      $cb = $b;
+    } else {
+      $h /= 60;
+      $i = (int)$h;
+      $f = $h - $i;
+      $p = $b * (1 - $s);
+      $q = $b * (1 - $s * $f);
+      $t = $b * (1 - $s * (1 - $f));
+      switch ($i) {
+        case 0:
+          $cr = $b;
+          $cg = $t;
+          $cb = $p;
+          break;
+        case 1:
+          $cr = $q;
+          $cg = $b;
+          $cb = $p;
+          break;
+        case 2:
+          $cr = $p;
+          $cg = $b;
+          $cb = $t;
+          break;
+        case 3:
+          $cr = $p;
+          $cg = $q;
+          $cb = $b;
+          break;
+        case 4:
+          $cr = $t;
+          $cg = $p;
+          $cb = $b;
+          break;
+        default:
+          $cr = $b;
+          $cg = $p;
+          $cb = $q;
+          break;
+      }
+    }
+
+    $cr = (int)round($cr * 255);
+    $cg = (int)round($cg * 255);
+    $cb = (int)round($cb * 255);
+
+    return ($cr << 16) + ($cg << 8) + $cb;
+  }
+
+  public function generate($x, $y) {
+    $image = imagecreatetruecolor($x, $y);
+    $this->draw($image, $x, $y);
+    return PhabricatorImageTransformer::saveImageDataInAnyFormat(
+      $image,
+      'image/jpeg');
+  }
+
+  abstract protected function draw($image, $x, $y);
+
+}

src/applications/lipsum/image/PhabricatorLipsumMondrianArtist.php

@@ -0,0 +1,48 @@
+<?php
+
+final class PhabricatorLipsumMondrianArtist extends PhabricatorLipsumArtist {
+
+  protected function draw($image, $x, $y) {
+    $c_white = 0xFFFFFF;
+    $c_black = 0x000000;
+    imagefill($image, 0, 0, $c_white);
+
+    $lines_h = mt_rand(2, 5);
+    $lines_v = mt_rand(2, 5);
+
+    for ($ii = 0; $ii < $lines_h; $ii++) {
+      $yp = mt_rand(0, $y);
+
+      $thickness = mt_rand(2, 3);
+      for ($jj = 0; $jj < $thickness; $jj++) {
+        imageline($image, 0, $yp + $jj, $x, $yp + $jj, $c_black);
+      }
+    }
+
+    for ($ii = 0; $ii < $lines_v; $ii++) {
+      $xp = mt_rand(0, $x);
+
+      $thickness = mt_rand(2, 3);
+      for ($jj = 0; $jj < $thickness; $jj++) {
+        imageline($image, $xp + $jj, 0, $xp + $jj, $y, $c_black);
+      }
+    }
+
+    $fills = mt_rand(3, 8);
+    for ($ii = 0; $ii < $fills; $ii++) {
+      $xp = mt_rand(0, $x);
+      $yp = mt_rand(0, $y);
+      if (imagecolorat($image, $xp, $yp) != $c_white) {
+        continue;
+      }
+
+      $c_fill = $this->getHSBColor(
+        mt_rand(0, 359),
+        mt_rand(80, 100) / 100,
+        mt_rand(90, 100) / 100);
+
+      imagefill($image, $xp, $yp, $c_fill);
+    }
+  }
+
+}