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22f4320bdb
rely on the administrator to tell us which is installed because PHP is not reliable (eg GD 2.* functions are available in 4.0.6 and later EVEN WHEN gd 2 is not present ... sigh). So, new config variable $CFG->gdversion
50 lines
1.8 KiB
PHP
50 lines
1.8 KiB
PHP
<?PHP // $Id$
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/// FUNCTIONS ///////////////////////////////////////////////////////////
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function ImageCopyBicubic ($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) {
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global $CFG;
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if (function_exists("ImageCopyResampled") and $CFG->gdversion >= 2) {
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return ImageCopyResampled($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y,
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$dst_w, $dst_h, $src_w, $src_h);
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}
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$totalcolors = imagecolorstotal($src_img);
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for ($i=0; $i<$totalcolors; $i++) {
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if ($colors = ImageColorsForIndex($src_img, $i)) {
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ImageColorAllocate($dst_img, $colors['red'], $colors['green'], $colors['blue']);
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}
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}
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$scaleX = ($src_w - 1) / $dst_w;
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$scaleY = ($src_h - 1) / $dst_h;
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$scaleX2 = $scaleX / 2.0;
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$scaleY2 = $scaleY / 2.0;
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for ($j = 0; $j < $dst_h; $j++) {
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$sY = $j * $scaleY;
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for ($i = 0; $i < $dst_w; $i++) {
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$sX = $i * $scaleX;
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$c1 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY+$scaleY2));
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$c2 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY));
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$c3 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY+$scaleY2));
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$c4 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY));
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$red = (int) (($c1['red'] + $c2['red'] + $c3['red'] + $c4['red']) / 4);
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$green = (int) (($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) / 4);
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$blue = (int) (($c1['blue'] + $c2['blue'] + $c3['blue'] + $c4['blue']) / 4);
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$color = ImageColorClosest ($dst_img, $red, $green, $blue);
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ImageSetPixel ($dst_img, $i + $dst_x, $j + $dst_y, $color);
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}
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}
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}
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?>
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