Some improvements and fixes for webgui

2026-09-12 11:05:09 +02:00
parent 82dea5800d
commit 4bc8dd8280
15 changed files with 206 additions and 36 deletions
@@ -43,3 +43,73 @@ function dir_get_size($path) {
    }
    return $total;
 } 
+
+function image_scale($imagefile, $mimetype, $width, $height, $factor) {
+    // scales down image in place
+    // returns size in bytes for new scaled image or -1 in case of error
+    global $g_message, $g_error;
+
+    if ($factor <= 0 || $factor >= 1) {
+        $g_error->Add("Internal error: Invalid image scale factor");
+        return -1;
+    }
+    $width = (int)($width * $factor);
+    $height = (int)($height * $factor);
+    if ($width < 1 || $height < 1) {
+        $g_error->Add("Internal error: Scaled image dimensions are too small");
+        return -1;
+    }
+    if ($mimetype == 'image/jpeg') {
+        $orig = imagecreatefromjpeg($imagefile);
+        if ($orig === false) {
+            $g_error->Add("Internal error: imagecreatefromjpeg failed");
+            return -1;
+        }
+        $scaled = imagescale($orig, $width, $height, IMG_BICUBIC); // TODO IMG_BICUBIC_FIXED?
+        if ($scaled === false) {
+            imagedestroy($orig);
+            $g_error->Add("Internal error: jpeg imagescale failed");
+            return -1;
+        }
+        if (!imagejpeg($scaled, $imagefile, 85)) {
+            imagedestroy($scaled);
+            imagedestroy($orig);
+            $g_error->Add("Internal error: imagejpeg failed");
+            return -1;
+        }
+    } else if ($mimetype == 'image/png') {
+        $orig = imagecreatefrompng($imagefile);
+        if ($orig === false) {
+            $g_error->Add("Internal error: imagecreatefrompng failed");
+            return -1;
+        }
+        $scaled = imagescale($orig, $width, $height, IMG_BICUBIC);
+        if ($scaled === false) {
+            imagedestroy($orig);
+            $g_error->Add("Internal error: png imagescale failed");
+            return -1;
+        }
+        // Preserve PNG transparency
+        imagealphablending($scaled, false);
+        imagesavealpha($scaled, true);
+        if (!imagepng($scaled, $imagefile, 9)) {
+            imagedestroy($scaled);
+            imagedestroy($orig);
+            $g_error->Add("Internal error: imagepng failed");
+            return -1;
+        }
+    } else {
+        $g_error->Add(sprintf(_('Internal error: Unknown mimetype %s!'), $mimetype));
+        return -1;
+    }
+    $g_message->add(sprintf(_('Image scaled down to %dx%d'), $width, $height));
+    imagedestroy($scaled);
+    imagedestroy($orig);
+    clearstatcache(true, $imagefile);
+    $size = filesize($imagefile);
+    if ($size === false) {
+        $g_error->Add("Internal error: filesize failed");
+        return -1;
+    }
+    return $size;
+}