PHP - Alpha'ing

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Socoder -> Web Development -> PHP - Alpha'ing
Tue, 15 Dec 2020, 09:53
Jayenkai	Today's abandoned challenge : Editing and saving images with alpha transparency, using PHP's image commands. I can do ’’On or Off’’ but anything in-between seems to be impossible! -=-=- ''Load, Next List!''
Tue, 15 Dec 2020, 09:53
cyangames	There are a couple of settings you can use to help preserve 8 bit transparency... I'll just find em, one mo -=-=- Web / Game Dev, occasionally finishes off coding games also!
Tue, 15 Dec 2020, 09:58
cyangames	I think if you set alphablending to false and savealpha to true on the image you're copying to then you should get better results between images. Assuming you're using GDLib here though, imagemagick is way more versatile. imagealphablending($targetImg, false); imagesavealpha($targetImg, true); --v -=-=- Web / Game Dev, occasionally finishes off coding games also!
Tue, 15 Dec 2020, 10:51
Jayenkai	Ta, I'll give that a go, later. I'm using PHP as-is on MacOS, so I'm not needing to reinstall buckets of stuff just to render an image!! (Although, apparently future MacOseses won't include it.. ffs!) -=-=- ''Load, Next List!''
Tue, 15 Dec 2020, 15:42
cyangames	Sounds like pretty terrible support there. Can you use a Virtual Machine and then run XAMPP as a workaround? -=-=- Web / Game Dev, occasionally finishes off coding games also!
Tue, 15 Dec 2020, 15:53
Jayenkai	PHP will still be installable, it just won't come preinstalled like it usually is. -=-=- ''Load, Next List!''
Tue, 15 Dec 2020, 16:13
cyangames	Ahhhhh, gotcha
Thu, 17 Dec 2020, 06:46
Jayenkai	Ugh.. Got halfway through doing this, then realised I was doing it on the wrong blooming' sprite sheet.. redo from start Thanks, though.. What I half-assed was at least working correctly -=-=- ''Load, Next List!''
Thu, 17 Dec 2020, 07:48
Jayenkai	Sorted.. Thanks, Rychan! Input = Output = -=-=- ''Load, Next List!''
Thu, 17 Dec 2020, 08:44

Jayenkai	Created : 17 December 2020 Edited : 17 December 2020 PHP Spritesheet Shuffler
A PHP script which. 1. Scans a folder for files named "filename_spritewidth_spriteheight_raw.png" or "filename_spritewidth_spriteheight_rawglow.png" 2. If padding is enabled, adds padding to the entire image, and sets the output to the next binary step. (eg 64,128,256,512,1024,2048) (I know that has a name, but right now I'm braindead!!) 3. Copies each individual sprite from your original sprite sheet onto the new sheet, leaving padding if required, and stripping out Magenta and Cyan from the output. (255,0,255 & 0,255,255) 4. Saves back out as a plain sprite sheet with transparencies where required, and again with IDs for each sprite on the sheet. 5. If the filename ended with rawglow instead of just raw, then it adds a blurry glow, and saves that version as G_filename.png (Note : This is slow!!) 6. If you've set a DupFolder, it places another copy of the final spritesheet in there, too. <?php $lf=chr(13).chr(10); echo '-=-=-=-=-=-=-=-=-=-=-=-=-=-'.$lf; echo ' Sprite Padder'.$lf; echo ' and'.$lf; echo ' Transparency Doohickey'.$lf; echo ''.$lf; echo 'A simple enough PHP script,'.$lf; echo ' by Jayenkai'.$lf; echo ' AGameAWeek.com'.$lf; echo 'with help from'.$lf; echo ' Rychan : @refreshgamesuk'.$lf; echo '-=-=-=-=-=-=-=-=-=-=-=-=-=-'.$lf; // -=-=-=-=-=- // Settings // -=-=-=-=-=- $pad=1; // width of padding around each sprite $countfix=1; // If I can fit "n and a bit" sprites on a row, // should the first one on the second row be n, or n+1? $strip=0; // Whether to remove the width/height when deciding on the filename $DupFolder="../../asset/"; // If you want a duplicate version of the file to be saved. // -=-=-=-=-=- // Code! // -=-=-=-=-=- $flist=scandir('./'); for ($n=0;$n<count($flist);$n++) { if (substr(strtolower($flist[$n]),-8)=="_raw.png") {Conv($flist[$n],0);} if (substr(strtolower($flist[$n]),-12)=="_rawglow.png") {Conv($flist[$n],1);} } function Conv($filename_raw,$glow) { global $lf,$pad,$countfix,$MaskA,$MaskB,$DupFolder,$strip; $fz=0; $fzw=0;$fzh=0; $filename=substr($filename_raw,0,strlen($filename_raw)-4); $filename_rawless=substr($filename,0,strlen($filename)-4); if ($glow==1) {$filename_rawless=substr($filename_rawless,0,strlen($filename_rawless)-4);} $bits=explode('_',$filename); $c=count($bits); if ($strip==1) { $filename=$bits[0]; $filename_rawless=$bits[0]; } if ($glow==0) {echo 'Conv : '.$filename.' ('.$filename_raw.')'.$lf;} if ($glow==1) {echo 'GLOW : '.$filename.' ('.$filename_raw.')'.$lf;} if ($c>2) {$in=abs($bits[$c-2]); if ($in>0) {$fz=$in;$fzw=$in;$fzh=$in;}} if ($c>3) {$in=abs($bits[$c-3]); if ($in>0) {$fz=$in;$fzw=$in;}} if ($fz==0) {echo " ERROR - Can't find default size".$lf; return;} echo ' Sprite Size '.$fzw.'x'.$fzh.$lf; $img_in=imagecreatefrompng($filename_raw); if ($img_in) { $iw=imagesx($img_in); $ih=imagesy($img_in); $gz=64; for ($u=0;$u<10;$u++) {if ($iw>$gz) {$gz=$gz2;} } $gw=floor($gz/($fzw+$pad+$pad)); $gh=floor($gz/($fzh+$pad+$pad)); $gw2=ceil($gz/($fzw+$pad+$pad)); $gh2=ceil($gz/($fzh+$pad+$pad)); if ($countfix==0) {echo " Sheet size ".$iw.'x'.$ih.' ('.$gw.'x'.$gh.' sprites)'.$lf;} if ($countfix==1) {echo " Sheet size ".$iw.'x'.$ih.' ('.$gw2.'x'.$gh2.' sprites)'.$lf;} echo " Output size ".$gz.'x'.$gz.' '.$lf; $img_out=imagecreatetruecolor($gz,$gz); imagealphablending($img_out, false); if ($glow==1) { $img_outg=imagecreatetruecolor($gz,$gz); imagealphablending($img_outg, false); } $magenta=imagecolorallocate($img_out,255,0,255); $cyan=imagecolorallocate($img_out,0,255,255); $white=imagecolorallocate($img_out,220,220,220); $black=imagecolorallocate($img_out,0,0,0); $trans=imagecolorallocatealpha($img_out,0,0,0,127); for ($x=0;$x<$gz;$x++) { for ($y=0;$y<$gz;$y++) { imagesetpixel($img_out,$x,$y,$trans); } } $rad=$gw/10; $rad=3; $radd=0.06; if ($gw==64) {$rad=8;$radd=0.15;} if ($glow==1) { $transg=imagecolorallocatealpha($img_outg,0,0,0,127); for ($x=0;$x<$gz;$x++) { for ($y=0;$y<$gz;$y++) { imagesetpixel($img_outg,$x,$y,$transg); } } } for ($sx=0;$sx<$gw;$sx++) { if ($glow==1) {echo $sx.'/'.$gw.$lf;} for ($sy=0;$sy<$gh;$sy++) { for ($x=0;$x<$fzw;$x++) {for ($y=0;$y<$fzh;$y++) { $fx=($sx$fzw)+$x; $fy=($sy$fzh)+$y; $tx=($sx($fzw+2$pad))+$x+$pad;$ty=($sy($fzh+2$pad))+$y+$pad; $c=imagecolorat($img_in,$fx,$fy); if ($c==$cyan) {$c=$trans;} if ($c==$magenta) {$c=$trans;} if ($filename_rawless=='006_64' && $c==$black) {$c=$trans;} if ($glow==1) { $cc=0;$a=0;$r=0;$g=0;$b=0; for ($ex=-$rad;$ex<$rad+1;$ex++){ for ($ey=-$rad;$ey<$rad+1;$ey++){ $d=sqrt(($ex$ex)+($ey$ey)); $fd=1/(($rad1.5)-$d); if ($d<=$rad+0.5) { $cc++; $px=$ex+$fx;$py=$ey+$fy; $pix=$x+$ex;$piy=$y+$ey; if ($px>-1 && $py>-1 && $px<$iw && $py<$gh$ih) { if ($pix>-1 && $piy>-1 && $pix<$fzw && $piy<$fzh) { $ic=imagecolorat($img_in,$px,$py); $do=1; if ($filename_rawless=='006_64' && $ic==$black) {$do=0;} if ($ic!=$cyan && $ic!=$magenta && $do==1) { $pr = ($ic >> 16) & 0xFF; $pg = ($ic >> 8) & 0xFF; $pb = $ic & 0xFF; $r+=($pr/255)$fd; $g+=($pg/255)$fd; $b+=($pb/255)$fd; $a+=$radd; } } } } } } if ($r<0) {$r=0;} if ($r>1) {$r=1;} $r=$r255; if ($g<0) {$g=0;} if ($g>1) {$g=1;} $g=$g255; if ($b<0) {$b=0;} if ($b>1) {$b=1;} $b=$b255; if ($a<0) {$a=0;} if ($a>1) {$a=1;} $a=127-($a127); $c3=imagecolorallocatealpha($img_outg,$r,$g,$b,$a); imagesetpixel($img_outg,$tx,$ty,$c3); imagecolordeallocate($img_outg,$c3); } imagesetpixel($img_out,$tx,$ty,$c); }} // x/y }}//sx/sy // Save // imagecolortransparent($img_out,$magenta); imagesavealpha($img_out, true); imagepng($img_out,$filename_rawless.'.png',2); if ($DupFolder!='') {imagepng($img_out,$DupFolder.$filename_rawless.'.png',2);} if ($glow==1) { imagesavealpha($img_outg, true); imagepng($img_outg,"G_".$filename_rawless.'.png',2); if ($DupFolder!='') {imagepng($img_outg,$DupFolder."G_".$filename_rawless.'.png',2);} // die(); } // Add IDs $n=0; for ($sx=0;$sx<$gw;$sx++) {for ($sy=0;$sy<$gh;$sy++) { $c=$sy$gw+$sx; if ($countfix==1) {$c=$sy$gw2+$sx;} $tx=($sx($fzw+2))-1;$ty=($sy*($fzh+2))-1; imagestring($img_out,5,$tx+1,$ty+1,$c,$black); imagestring($img_out,5,$tx,$ty,$c,$white); }} imagepng($img_out,$filename_rawless.'_ID.png',2); imagedestroy($img_out); imagedestroy($img_in); } else { echo " ERROR - Couldn't load image".$lf; } } ?> --v Works fine in PHP7 with GDLib installed. Daren't test with PHP8, it'll probably implode!!

Thu, 17 Dec 2020, 09:22
cyangames	Glad I could help a lil bit

PHP Spritesheet Shuffler