Changeset 7041

Timestamp:

02/26/2008 06:46:03 PM (17 years ago)

Author:

ryan

Message:

image_resize() and friends from tellyworth. fixes #6005

Location:

trunk

Files:

• wp-admin/includes/image.php (modified) (1 diff)
• wp-includes/media.php (modified) (1 diff)

trunk/wp-admin/includes/image.php

@@ -226 +226 @@
 function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
     return wp_constrain_dimensions( $width, $height, $wmax, $hmax );
-}
-
-// same as wp_shrink_dimensions, except the max parameters are optional.
-// if either width or height are empty, no constraint is applied on that dimension.
-function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
-    if ( !$max_width and !$max_height )
-        return array( $current_width, $current_height );
-    
-    $width_ratio = $height_ratio = 1.0;
-    
-    if ( $max_width > 0 && $current_width > $max_width )
-        $width_ratio = $max_width / $current_width;
-    
-    if ( $max_height > 0 && $current_height > $max_height )
-        $height_ratio = $max_height / $current_height;
-    
-    // the smaller ratio is the one we need to fit it to the constraining box
-    $ratio = min( $width_ratio, $height_ratio );
-    
-    return array( intval($current_width * $ratio), intval($current_height * $ratio) );
 }
 

trunk/wp-includes/media.php

@@ -93 +93 @@
 }
 
+// same as wp_shrink_dimensions, except the max parameters are optional.
+// if either width or height are empty, no constraint is applied on that dimension.
+function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
+    if ( !$max_width and !$max_height )
+        return array( $current_width, $current_height );
+    
+    $width_ratio = $height_ratio = 1.0;
+    
+    if ( $max_width > 0 && $current_width > $max_width )
+        $width_ratio = $max_width / $current_width;
+    
+    if ( $max_height > 0 && $current_height > $max_height )
+        $height_ratio = $max_height / $current_height;
+    
+    // the smaller ratio is the one we need to fit it to the constraining box
+    $ratio = min( $width_ratio, $height_ratio );
+    
+    return array( intval($current_width * $ratio), intval($current_height * $ratio) );
+}
+
+// calculate dimensions and coordinates for a resized image that fits within a specified width and height
+// if $crop is true, the largest matching central portion of the image will be cropped out and resized to the required size
+function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=false) {
+    
+    if ($orig_w <= 0 || $orig_h <= 0)
+        return false;
+    // at least one of dest_w or dest_h must be specific
+    if ($dest_w <= 0 && $dest_h <= 0)
+        return false;
+    
+    if ( $crop ) {
+        // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
+        $aspect_ratio = $orig_w / $orig_h;
+        $new_w = min($dest_w, $orig_w);
+        $new_h = min($dest_h, $orig_h);
+        if (!$new_w) {
+            $new_w = intval($new_h * $aspect_ratio);
+        }
+        if (!$new_h) {
+            $new_h = intval($new_w / $aspect_ratio);
+        }
+
+        $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
+        
+        $crop_w = ceil($new_w / $size_ratio);
+        $crop_h = ceil($new_h / $size_ratio);
+
+        $s_x = floor(($orig_w - $crop_w)/2);
+        $s_y = floor(($orig_h - $crop_h)/2);
+    }
+    else {
+        // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
+        $crop_w = $orig_w;
+        $crop_h = $orig_h;
+        
+        $s_x = 0;
+        $s_y = 0;
+        
+        list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
+    }
+    
+    // if the resulting image would be the same size or larger we don't want to resize it
+    if ($new_w >= $orig_w && $new_h >= $orig_h)
+        return false;
+
+    // the return array matches the parameters to imagecopyresampled()
+    // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
+    return array(0, 0, $s_x, $s_y, $new_w, $new_h, $crop_w, $crop_h);
+
+}
+
+// Scale down an image to fit a particular size and save a new copy of the image
+function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_path=null, $jpeg_quality=75) {
+
+    $image = wp_load_image( $file );
+    if ( !is_resource( $image ) )
+        return new WP_Error('error_loading_image', $image);
+
+    list($orig_w, $orig_h, $orig_type) = getimagesize( $file );
+    $dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
+    if (!$dims)
+        return $dims;
+    list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
+    
+    $newimage = imagecreatetruecolor( $dst_w, $dst_h);
+
+    // preserve PNG transparency
+    if ( IMAGETYPE_PNG == $orig_type && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
+        imagealphablending( $newimage, false);
+        imagesavealpha( $newimage, true);
+    }
+
+    imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
+
+    // we don't need the original in memory anymore
+    imagedestroy( $image );
+
+    // $suffix will be appended to the destination filename, just before the extension
+    if ( !$suffix )
+        $suffix = "{$dst_w}x{$dst_h}";
+
+    $info = pathinfo($file);
+    $dir = $info['dirname'];
+    $ext = $info['extension'];
+    $name = basename($file, ".{$ext}");
+    if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
+        $dir = $_dest_path;
+    $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
+
+    if ( $orig_type == IMAGETYPE_GIF ) {
+        if (!imagegif( $newimage, $destfilename ) )
+            return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
+    }
+    elseif ( $orig_type == IMAGETYPE_PNG ) {
+        if (!imagepng( $newimage, $destfilename ) )
+            return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
+    }
+    else {
+        // all other formats are converted to jpg
+        $destfilename = "{$dir}/{$name}-{$suffix}.jpg";
+        if (!imagejpeg( $newimage, $destfilename, $jpeg_quality ) )
+            return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
+    }
+
+    imagedestroy( $newimage );
+
+    // Set correct file permissions
+    $stat = stat( dirname( $destfilename ));
+    $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
+    @ chmod( $destfilename, $perms );
+
+    return $destfilename;
+}
+
 ?>