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Improve RotateModifier for GD driver

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This commit is contained in:
Oliver Vogel 2023-11-11 09:16:43 +01:00
parent eb52217da2
commit ad717ca656
1 changed files with 77 additions and 14 deletions
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91
src/Drivers/Gd/Modifiers/RotateModifier.php
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@ -2,34 +2,97 @@
namespace Intervention\Image\Drivers\Gd\Modifiers;
use Intervention\Image\Colors\Rgb\Channels\Blue;
use Intervention\Image\Colors\Rgb\Channels\Green;
use Intervention\Image\Colors\Rgb\Channels\Red;
use Intervention\Image\Drivers\Abstract\Modifiers\AbstractRotateModifier;
use Intervention\Image\Drivers\Gd\Traits\CanHandleColors;
use Intervention\Image\Geometry\Rectangle;
use Intervention\Image\Interfaces\ColorInterface;
use Intervention\Image\Interfaces\FrameInterface;
use Intervention\Image\Interfaces\ImageInterface;
use Intervention\Image\Interfaces\ModifierInterface;
use Intervention\Image\Traits\CanBuildNewImage;
class RotateModifier extends AbstractRotateModifier implements ModifierInterface
{
use CanHandleColors;
use CanBuildNewImage;
public function apply(ImageInterface $image): ImageInterface
{
$background = $this->handleInput($this->background);
foreach ($image as $frame) {
// retain resolution because imagerotate() seems to reset density to 96dpi
$resolution = imageresolution($frame->core());
// rotate image
$frame->setCore(
imagerotate(
$frame->core(),
$this->rotationAngle(),
$this->colorToInteger($this->backgroundColor())
)
);
// restore original image resolution
imageresolution($frame->core(), $resolution[0], $resolution[1]);
$this->modify($frame, $background);
}
return $image;
}
protected function modify(FrameInterface $frame, ColorInterface $background): void
{
// rotate original image against transparent background
$rotated = imagerotate(
$frame->core(),
$this->rotationAngle(),
imagecolorallocatealpha(
$frame->core(),
$background->channel(Red::class)->value(),
$background->channel(Green::class)->value(),
$background->channel(Blue::class)->value(),
127
)
);
// create size from original after rotation
$container = (new Rectangle(
imagesx($rotated),
imagesy($rotated),
))->movePivot('center');
// create size from original and rotate points
$cutout = (new Rectangle(
imagesx($frame->core()),
imagesy($frame->core()),
$container->pivot()
))->align('center')
->valign('center')
->rotate($this->rotationAngle() * -1);
// create new gd image
$modified = $this->imageFactory()->newCore(
imagesx($rotated),
imagesy($rotated),
$background
);
// define transparent colors
$transparent = imagecolorallocatealpha($modified, 255, 0, 255, 127);
imagecolortransparent($modified, $transparent);
// draw the cutout on new gd image to have a transparent
// background where the rotated image will be placed
imagealphablending($modified, false);
imagefilledpolygon(
$modified,
$cutout->toArray(),
$transparent
);
// place rotated image on new gd image
imagealphablending($modified, true);
imagecopy(
$modified,
$rotated,
0,
0,
0,
0,
imagesx($rotated),
imagesy($rotated)
);
$frame->setCore($modified);
}
}