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Code Issues Releases Wiki Activity

Fix alpha blending in ResizeCanvasModifier

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This commit is contained in:
Oliver Vogel
2024-08-15 16:11:05 +02:00
parent 3ba445b2d3
commit 21cb93dcc6
1 changed files with 9 additions and 10 deletions
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19
src/Drivers/Gd/Modifiers/ResizeCanvasModifier.php
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@@ -43,7 +43,7 @@ class ResizeCanvasModifier extends GenericResizeCanvasModifier implements Specia
SizeInterface $resize,
ColorInterface $background,
): void {
// create new canvas with target size & target background color
// create new canvas with target size & transparent background color
$modified = Cloner::cloneEmpty($frame->native(), $resize, $background);
// make image area transparent to keep transparency
@@ -56,19 +56,20 @@ class ResizeCanvasModifier extends GenericResizeCanvasModifier implements Specia
127,
);
imagealphablending($modified, false); // do not blend - just overwrite
// create transparent area to place the original on top
imagealphablending($modified, false); // do not blend / just overwrite
imagecolortransparent($modified, $transparent);
imagefilledrectangle(
$modified,
$resize->pivot()->x() * -1,
$resize->pivot()->y() * -1,
$resize->pivot()->x() * -1 + $frame->size()->width() - 1,
$resize->pivot()->y() * -1 + $frame->size()->height() - 1,
$transparent
abs($resize->pivot()->x()) + $frame->size()->width() - 1,
abs($resize->pivot()->y()) + $frame->size()->height() - 1,
$transparent,
);
// copy image from original with blending alpha
imagealphablending($modified, true);
imagecopyresampled(
// place original
imagecopy(
$modified,
$frame->native(),
$resize->pivot()->x() * -1,
@@ -77,8 +78,6 @@ class ResizeCanvasModifier extends GenericResizeCanvasModifier implements Specia
0,
$frame->size()->width(),
$frame->size()->height(),
$frame->size()->width(),
$frame->size()->height()
);
// set new content as resource