mirror of
https://github.com/PHPOffice/PhpSpreadsheet.git
synced 2026-09-22 08:09:15 +00:00
oleibman
ea4f0a2404
Fix #3624. Use the same logic as elsewhere in the same module to invoke `imagesavealpha` when appropriate. (I confess that I do not understand the use case where you would not use imagesavealpha.) The fix was easy; writing a test was not. Google to the rescue.
92 lines
3.1 KiB
PHP
92 lines
3.1 KiB
PHP
<?php
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namespace PhpOffice\PhpSpreadsheetTests\Writer\Xlsx;
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use GdImage;
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use PhpOffice\PhpSpreadsheet\Reader\Xlsx as XlsxReader;
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use PhpOffice\PhpSpreadsheet\Shared\File;
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use PhpOffice\PhpSpreadsheet\Spreadsheet;
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use PhpOffice\PhpSpreadsheet\Worksheet\Drawing;
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use PhpOffice\PhpSpreadsheet\Worksheet\MemoryDrawing;
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use PhpOffice\PhpSpreadsheet\Writer\Xlsx as XlsxWriter;
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use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
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class MemoryDrawingTest extends AbstractFunctional
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{
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private string $outfile = '';
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protected function tearDown(): void
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{
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if ($this->outfile !== '') {
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unlink($this->outfile);
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$this->outfile = '';
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}
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}
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/**
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* Test save and load XLSX file with transparent png.
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*/
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public function testIssue3624(): void
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{
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$spreadsheet = new Spreadsheet();
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$sheet = $spreadsheet->getActiveSheet();
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$contents = file_get_contents('tests/data/Writer/XLSX/issue.3624b.png');
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$stamp = MemoryDrawing::fromString("$contents");
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$stamp->setName('Stamp');
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$stamp->setHeight(120);
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$stamp->setCoordinates('A2');
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$stamp->setWorksheet($sheet);
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$this->outfile = File::temporaryFilename();
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$writer = new XlsxWriter($spreadsheet);
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$writer->save($this->outfile);
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$spreadsheet->disconnectWorksheets();
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$reader = new XlsxReader();
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$reloadedSpreadsheet = $reader->load($this->outfile);
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$rsheet = $reloadedSpreadsheet->getActiveSheet();
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$drawings = $rsheet->getDrawingCollection();
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self::assertCount(1, $drawings);
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foreach ($drawings as $drawing) {
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if ($drawing instanceof Drawing) {
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$path = $drawing->getPath();
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$contents = file_get_contents($path);
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$gdImage = imagecreatefromstring("$contents");
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if ($gdImage === false) {
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self::fail('unexpected failure in imagecreatefromstring');
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} else {
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self::assertTrue(self::checkTransparent($gdImage));
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}
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} else {
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self::fail('Unexpected drawing not in Drawing class');
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}
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}
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$reloadedSpreadsheet->disconnectWorksheets();
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}
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/**
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* Determine if image uses transparency.
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*
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* @see https://stackoverflow.com/questions/5495275/how-to-check-if-a-png-image-has-transparency-using-gd
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*
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* @param GdImage|resource $im
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*/
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private static function checkTransparent($im): bool
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{
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$width = imagesx($im); // Get the width of the image
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$height = imagesy($im); // Get the height of the image
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// We run the image pixel by pixel and as soon as we find a transparent pixel we stop and return true.
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for ($i = 0; $i < $width; ++$i) {
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for ($j = 0; $j < $height; ++$j) {
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$rgba = imagecolorat($im, $i, $j);
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if (($rgba & 0x7F000000) >> 24) {
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return true;
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}
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}
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}
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// If we dont find any pixel the function will return false.
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return false;
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}
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}
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