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Added option to transcode extension and thumbnailing to choose the color to use to fill in the background when converting an image with an alpha channel to a format without

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This commit is contained in:
Matthew Barbour
2020-06-14 11:36:52 -05:00
committed by Shish
parent 984c9702ec
commit 7f68ef1cfd
10 changed files with 97 additions and 28 deletions
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69
ext/media/main.php
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@@ -16,12 +16,7 @@ class Media extends Extension
/** @var MediaTheme */
protected $theme;
const IMAGE_MEDIA_ENGINES = [
"GD" => MediaEngine::GD,
"ImageMagick" => MediaEngine::IMAGICK,
];
const LOSSLESS_FORMATS = [
private const LOSSLESS_FORMATS = [
MimeType::WEBP_LOSSLESS,
MimeType::PNG,
MimeType::PSD,
@@ -31,16 +26,17 @@ class Media extends Extension
MimeType::GIF
];
const ALPHA_FORMATS = [
private const ALPHA_FORMATS = [
MimeType::WEBP_LOSSLESS,
MimeType::WEBP,
MimeType::PNG,
];
const RESIZE_TYPE_FIT = "Fit";
const RESIZE_TYPE_FIT_BLUR = "Fit Blur";
const RESIZE_TYPE_FILL = "Fill";
const RESIZE_TYPE_STRETCH = "Stretch";
public const RESIZE_TYPE_FIT = "Fit";
public const RESIZE_TYPE_FIT_BLUR = "Fit Blur";
public const RESIZE_TYPE_FILL = "Fill";
public const RESIZE_TYPE_STRETCH = "Stretch";
public const DEFAULT_ALPHA_CONVERSION_COLOR = "#00000000";
public static function imagick_available(): bool
{
@@ -194,6 +190,7 @@ class Media extends Extension
$event->target_height,
$event->output_path,
$event->target_mime,
$event->alpha_color,
$event->resize_type,
$event->target_quality,
$event->allow_upscale
@@ -210,6 +207,7 @@ class Media extends Extension
$event->target_height,
$event->output_path,
$event->target_mime,
$event->alpha_color,
$event->resize_type,
$event->target_quality,
$event->minimize,
@@ -542,6 +540,7 @@ class Media extends Extension
int $new_height,
string $output_filename,
string $output_mime = null,
string $alpha_color = Media::DEFAULT_ALPHA_CONVERSION_COLOR,
string $resize_type = self::RESIZE_TYPE_FIT,
int $output_quality = 80,
bool $minimize = false,
@@ -563,7 +562,7 @@ class Media extends Extension
$output_mime = MimeType::WEBP_LOSSLESS;
}
$bg = "black";
$bg = "\"$alpha_color\"";
if (self::supports_alpha($output_mime)) {
$bg = "none";
}
@@ -590,15 +589,15 @@ class Media extends Extension
switch ($resize_type) {
case Media::RESIZE_TYPE_FIT:
case Media::RESIZE_TYPE_STRETCH:
$args .= "${resize_arg} ${new_width}x${new_height}${resize_suffix} ${file_arg}";
$args .= "${file_arg} ${resize_arg} ${new_width}x${new_height}${resize_suffix} -background ${bg} -flatten ";
break;
case Media::RESIZE_TYPE_FILL:
$args .= "${resize_arg} ${new_width}x${new_height}\^ -background none -gravity center -extent ${new_width}x${new_height} ${file_arg}";
$args .= "${file_arg} ${resize_arg} ${new_width}x${new_height}\^ -background ${bg} -flatten -gravity center -extent ${new_width}x${new_height} ";
break;
case Media::RESIZE_TYPE_FIT_BLUR:
$blur_size = max(ceil(max($new_width, $new_height) / 25), 5);
$args .= "${file_arg} ".
"\( -clone 0 -resize ${new_width}x${new_height}\^ -background none -gravity center -fill black -colorize 50% -extent ${new_width}x${new_height} -blur 0x${blur_size} \) ".
"\( -clone 0 -resize ${new_width}x${new_height}\^ -background ${bg} -flatten -gravity center -fill black -colorize 50% -extent ${new_width}x${new_height} -blur 0x${blur_size} \) ".
"\( -clone 0 -resize ${new_width}x${new_height} \) ".
"-delete 0 -gravity center -compose over -composite";
break;
@@ -615,7 +614,7 @@ class Media extends Extension
}
$args .= " -quality ${output_quality} -background ${bg}";
$args .= " -quality ${output_quality} ";
$output_ext = self::determine_ext($output_mime);
@@ -651,6 +650,7 @@ class Media extends Extension
int $new_height,
string $output_filename,
string $output_mime = null,
string $alpha_color = Media::DEFAULT_ALPHA_CONVERSION_COLOR,
string $resize_type = self::RESIZE_TYPE_FIT,
int $output_quality = 80,
bool $allow_upscale = true
@@ -769,6 +769,34 @@ class Media extends Extension
throw new MediaException("Unable to copy resized image data to new image");
}
switch ($output_mime) {
case MimeType::BMP:
case MimeType::JPEG:
// In case of alpha channels
$width = imagesx($image_resized);
$height = imagesy($image_resized);
$new_image = imagecreatetruecolor($width, $height);
if ($new_image===false) {
throw new ImageTranscodeException("Could not create image with dimensions $width x $height");
}
$background_color = Media::hex_color_allocate($new_image, $alpha_color);
if ($background_color===false) {
throw new ImageTranscodeException("Could not allocate background color");
}
if (imagefilledrectangle($new_image, 0, 0, $width, $height, $background_color)===false) {
throw new ImageTranscodeException("Could not fill background color");
}
if (imagecopy($new_image, $image_resized, 0, 0, 0, 0, $width, $height)===false) {
throw new ImageTranscodeException("Could not copy source image to new image");
}
imagedestroy($image_resized);
$image_resized = $new_image;
break;
}
switch ($output_mime) {
case MimeType::BMP:
$result = imagebmp($image_resized, $output_filename, true);
@@ -904,4 +932,13 @@ class Media extends Extension
$database->begin_transaction();
}
}
public static function hex_color_allocate($im, $hex)
{
$hex = ltrim($hex, '#');
$a = hexdec(substr($hex, 0, 2));
$b = hexdec(substr($hex, 2, 2));
$c = hexdec(substr($hex, 4, 2));
return imagecolorallocate($im, $a, $b, $c);
}
}