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feature 2040 added: automatic rotation of the photo based on EXIF Orientation.

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The code could have been shorter but this one 1) checks the resize dimension
with the rotation in mind 2) rotates the photo once resized to reduce memory
used.


git-svn-id: http://piwigo.org/svn/trunk@7868 68402e56-0260-453c-a942-63ccdbb3a9ee
This commit is contained in:
plegall 2010-11-24 12:45:16 +00:00
parent 8e25506673
commit 73b83574b9
1 changed files with 81 additions and 21 deletions
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102
admin/include/functions_upload.inc.php
View file

@ -183,6 +183,9 @@ function prepare_directory($directory)
function need_resize($image_filepath, $max_width, $max_height)
{
// TODO : the resize check should take the orientation into account. If a
// rotation must be applied to the resized photo, then we should test
// invert width and height.
list($width, $height) = getimagesize($image_filepath);
if ($width > $max_width or $height > $max_height)
@ -193,6 +196,48 @@ function need_resize($image_filepath, $max_width, $max_height)
return false;
}
function get_resize_dimensions($width, $height, $max_width, $max_height, $rotation=null)
{
$rotate_for_dimensions = false;
if (isset($rotation) and in_array(abs($rotation), array(90, 270)))
{
$rotate_for_dimensions = true;
}
if ($rotate_for_dimensions)
{
list($width, $height) = array($height, $width);
}
$ratio_width = $width / $max_width;
$ratio_height = $height / $max_height;
// maximal size exceeded ?
if ($ratio_width > 1 or $ratio_height > 1)
{
if ($ratio_width < $ratio_height)
{
$destination_width = ceil($width / $ratio_height);
$destination_height = $max_height;
}
else
{
$destination_width = $max_width;
$destination_height = ceil($height / $ratio_width);
}
}
if ($rotate_for_dimensions)
{
list($destination_width, $destination_height) = array($destination_height, $destination_width);
}
return array(
'width' => $destination_width,
'height'=> $destination_height,
);
}
function pwg_image_resize($result, $source_filepath, $destination_filepath, $max_width, $max_height, $quality)
{
if ($result !== false)
@ -222,36 +267,45 @@ function pwg_image_resize($result, $source_filepath, $destination_filepath, $max
{
die('unsupported file extension');
}
$rotation = null;
if (function_exists('imagerotate'))
{
$exif = exif_read_data($source_filepath);
if (isset($exif['Orientation']) and preg_match('/^\s*(\d)/', $exif['Orientation'], $matches))
{
$orientation = $matches[1];
if (in_array($orientation, array(3, 4)))
{
$rotation = 180;
}
elseif (in_array($orientation, array(5, 6)))
{
$rotation = 270;
}
elseif (in_array($orientation, array(7, 8)))
{
$rotation = 90;
}
}
}
// width/height
$source_width = imagesx($source_image);
$source_height = imagesy($source_image);
$ratio_width = $source_width / $max_width;
$ratio_height = $source_height / $max_height;
// maximal size exceeded ?
if ($ratio_width > 1 or $ratio_height > 1)
{
if ($ratio_width < $ratio_height)
{
$destination_width = ceil($source_width / $ratio_height);
$destination_height = $max_height;
}
else
{
$destination_width = $max_width;
$destination_height = ceil($source_height / $ratio_width);
}
}
else
$resize_dimensions = get_resize_dimensions($source_width, $source_height, $max_width, $max_height, $rotation);
// testing on height is useless in theory: if width is unchanged, there
// should be no resize, because width/height ratio is not modified.
if ($resize_dimensions['width'] == $source_width and $resize_dimensions['height'] == $source_height)
{
// the image doesn't need any resize! We just copy it to the destination
copy($source_filepath, $destination_filepath);
return true;
}
$destination_image = imagecreatetruecolor($destination_width, $destination_height);
$destination_image = imagecreatetruecolor($resize_dimensions['width'], $resize_dimensions['height']);
imagecopyresampled(
$destination_image,
@ -260,11 +314,17 @@ function pwg_image_resize($result, $source_filepath, $destination_filepath, $max
0,
0,
0,
$destination_width,
$destination_height,
$resize_dimensions['width'],
$resize_dimensions['height'],
$source_width,
$source_height
);
// rotation occurs only on resized photo to avoid useless memory use
if (isset($rotation))
{
$destination_image = imagerotate($destination_image, $rotation, 0);
}
$extension = strtolower(get_extension($destination_filepath));
if ($extension == 'png')