function RoundedImageCorners(&$gdimg, $radius_x, $radius_y)
{
if ($gdimg_cornermask_triple = ImageCreateTrueColor($radius_x * 6, $radius_y * 6)) {
if ($gdimg_cornermask = ImageCreateTrueColor(ImageSX($gdimg), ImageSY($gdimg))) {
$color_transparent = ImageColorAllocate($gdimg_cornermask_triple, 255, 255, 255);
ImageFilledEllipse($gdimg_cornermask_triple, $radius_x * 3, $radius_y * 3, $radius_x * 4, $radius_y * 4, $color_transparent);
ImageFilledRectangle($gdimg_cornermask, 0, 0, ImageSX($gdimg), ImageSY($gdimg), $color_transparent);
ImageCopyResampled($gdimg_cornermask, $gdimg_cornermask_triple, 0, 0, $radius_x, $radius_y, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
ImageCopyResampled($gdimg_cornermask, $gdimg_cornermask_triple, 0, ImageSY($gdimg) - $radius_y, $radius_x, $radius_y * 3, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
ImageCopyResampled($gdimg_cornermask, $gdimg_cornermask_triple, ImageSX($gdimg) - $radius_x, ImageSY($gdimg) - $radius_y, $radius_x * 3, $radius_y * 3, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
ImageCopyResampled($gdimg_cornermask, $gdimg_cornermask_triple, ImageSX($gdimg) - $radius_x, 0, $radius_x * 3, $radius_y, $radius_x, $radius_y, $radius_x * 2, $radius_y * 2);
ApplyMask($gdimg_cornermask, $gdimg);
ImageDestroy($gdimg_cornermask);
$DebugMessage = 'RoundedImageCorners(' . $radius_x . ', ' . $radius_y . ') succeeded' . __FILE__ . __LINE__;
return true;
} else {
$DebugMessage = 'FAILED: $gdimg_cornermask = ImageColorAllocate(' . ImageSX($gdimg) . ', ' . ImageSY($gdimg) . ')' . __FILE__ . __LINE__;
}
ImageDestroy($gdimg_cornermask_triple);
} else {
$DebugMessage = 'FAILED: $gdimg_cornermask_triple = ImageColorAllocate(' . $radius_x * 6 . ', ' . $radius_y * 6 . ')' . __FILE__ . __LINE__;
}
return false;
}
function ApplyRoundedCorners(&$image, $radius = 0)
{
if ($radius <= 0) {
$radius = Round(ImageSX($image) / 4);
}
/* Generate mask at twice desired resolution and downsample afterwards for
* easy antialiasing mask is generated as a white double-size elipse on a
* triple-size black background and copy-paste-resampled onto a
* correct-size mask image as 4 corners due to errors when the entire mask
* is resampled at once (gray edges).
* */
$x = ImageSX($image);
$y = ImageSY($image);
$cornermask = ImageCreateTrueColor($x * 2, $y * 2);
$cornermask3 = ImageCreateTrueColor($radius * 6, $radius * 6);
$color_transparent = ImageColorAllocate($cornermask3, 255, 255, 255);
ImageFilledEllipse($cornermask3, $radius * 3, $radius * 3, $radius * 4, $radius * 4, $color_transparent);
ImageFilledRectangle($cornermask, 0, 0, $x * 2, $y * 2, $color_transparent);
ImageCopyResampled($cornermask, $cornermask3, 0, 0, $radius, $radius, $radius, $radius, $radius * 2, $radius * 2);
ImageCopyResampled($cornermask, $cornermask3, 0, $y * 2 - $radius, $radius, $radius * 3, $radius, $radius, $radius * 2, $radius * 2);
ImageCopyResampled($cornermask, $cornermask3, $x * 2 - $radius, $y * 2 - $radius, $radius * 3, $radius * 3, $radius, $radius, $radius * 2, $radius * 2);
ImageCopyResampled($cornermask, $cornermask3, $x * 2 - $radius, 0, $radius * 3, $radius, $radius, $radius, $radius * 2, $radius * 2);
ImageDestroy($cornermask3);
ApplyMask($image, $cornermask);
ImageDestroy($cornermask);
}
