watermark a png image with a png image
Posted: Wed Nov 30, 2011 12:34 am
Hi!
i have png image which i want to have water marked.and the watermark image is a logo which is also png image...but it does not create watermark...it only shows the logo not the picture which needs to be watermarked.but when i watermark any jpeg or gif image with the png image which is logo in my case then it works correctly...i have tried to convert my imge to jpeg before watermarking even then it doen not work.
here is my code for your review..plz help me
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* gdlib.php - Collection of routines in Moodle related to
* processing images using GD
*
* @package core
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
*
* long description
* @global object
* @param object $dst_img
* @param object $src_img
* @param int $dst_x
* @param int $dst_y
* @param int $src_x
* @param int $src_y
* @param int $dst_w
* @param int $dst_h
* @param int $src_w
* @param int $src_h
* @return bool
* @todo Finish documenting this function
*/
function ImageCopyBicubic($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) {
global $CFG;
if (function_exists('ImageCopyResampled') and $CFG->gdversion >= 2) {
return ImageCopyResampled($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y,
$dst_w, $dst_h, $src_w, $src_h);
}
$totalcolors = imagecolorstotal($src_img);
for ($i=0; $i<$totalcolors; $i++) {
if ($colors = ImageColorsForIndex($src_img, $i)) {
ImageColorAllocate($dst_img, $colors['red'], $colors['green'], $colors['blue']);
}
}
$scaleX = ($src_w - 1) / $dst_w;
$scaleY = ($src_h - 1) / $dst_h;
$scaleX2 = $scaleX / 2.0;
$scaleY2 = $scaleY / 2.0;
for ($j = 0; $j < $dst_h; $j++) {
$sY = $j * $scaleY;
for ($i = 0; $i < $dst_w; $i++) {
$sX = $i * $scaleX;
$c1 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY+$scaleY2));
$c2 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY));
$c3 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY+$scaleY2));
$c4 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY));
$red = (int) (($c1['red'] + $c2['red'] + $c3['red'] + $c4['red']) / 4);
$green = (int) (($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) / 4);
$blue = (int) (($c1['blue'] + $c2['blue'] + $c3['blue'] + $c4['blue']) / 4);
$color = ImageColorClosest ($dst_img, $red, $green, $blue);
ImageSetPixel ($dst_img, $i + $dst_x, $j + $dst_y, $color);
}
}
}
/**
* Stores optimised icon images in icon file area
*
* @param $context
* @param component
* @param $itemid
* @param $originalfile
* @return success
*/
function process_new_icon($context, $component, $filearea, $itemid, $originalfile) {
global $CFG;
if (empty($CFG->gdversion)) {
return false;
}
if (!is_file($originalfile)) {
return false;
}
$imageinfo = GetImageSize($originalfile);
if (empty($imageinfo)) {
return false;
}
$image = new stdClass();
$image->width = $imageinfo[0];
$image->height = $imageinfo[1];
$image->type = $imageinfo[2];
switch ($image->type) {
case IMAGETYPE_GIF:
if (function_exists('ImageCreateFromGIF')) {
$im = ImageCreateFromGIF($originalfile);
} else {
debugging('GIF not supported on this server');
return false;
}
break;
case IMAGETYPE_JPEG:
if (function_exists('ImageCreateFromJPEG')) {
$im = ImageCreateFromJPEG($originalfile);
} else {
debugging('JPEG not supported on this server');
return false;
}
break;
case IMAGETYPE_PNG:
if (function_exists('ImageCreateFromPNG')) {
$im = ImageCreateFromPNG($originalfile);
} else {
debugging('PNG not supported on this server');
return false;
}
break;
default:
return false;
}
if (function_exists('ImagePng')) {
$imagefnc = 'ImagePng';
$imageext = '.png';//hina
$filters = PNG_NO_FILTER;
$quality = 0;
} else if (function_exists('ImageJpeg')) {
$imagefnc = 'ImageJpeg';
$imageext = '.jpg';
$filters = null; // not used
$quality = 90;
} else {
debugging('Jpeg and png not supported on this server, please fix server configuration');
return false;
}
if (function_exists('ImageCreateTrueColor') and $CFG->gdversion >= 2) {
$im1 = ImageCreateTrueColor(100,100);
$im2 = ImageCreateTrueColor(35,35);
if ($image->type == IMAGETYPE_PNG and $imagefnc === 'ImagePng') {
imagealphablending($im1, false);
$color = imagecolorallocatealpha($im1, 0, 0, 0, 127);
imagefill($im1, 0, 0, $color);
imagesavealpha($im1, true);
imagealphablending($im2, false);
$color = imagecolorallocatealpha($im2, 0, 0, 0, 127);
imagefill($im2, 0, 0, $color);
imagesavealpha($im2, true);
}
} else {
$im1 = ImageCreate(100,100);
$im2 = ImageCreate(35,35);
}
$cx = $image->width / 2;
$cy = $image->height / 2;
if ($image->width < $image->height) {
$half = floor($image->width / 2.0);
} else {
$half = floor($image->height / 2.0);
}
ImageCopyBicubic($im1, $im, 0, 0, $cx-$half, $cy-$half, 100, 100, $half*2, $half*2);
ImageCopyBicubic($im2, $im, 0, 0, $cx-$half, $cy-$half, 35, 35, $half*2, $half*2);
//@khyam: Adding Water Mark
$wm->im1 = imagecreatefrompng($CFG->dirroot.'/pix/watermark1.png'); //creating watermakr image using png.
$wm->im2 = imagecreatefrompng($CFG->dirroot.'/pix/watermark2.png');
imagecopy($im1, $wm->im1, 0, 0, 0, 0, 100, 100); //applying watermark on profile image.
imagecopy($im2, $wm->im2, 0, 0, 0, 0, 35, 35);
//End of watermark script.
$fs = get_file_storage();
$icon = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>'/');
ob_start();
if (!$imagefnc($im1, NULL, $quality, $filters)) {
// keep old icons
ob_end_clean();
return false;
}
$data = ob_get_clean();
ImageDestroy($im1);
$icon['filename'] = 'f1'.$imageext;
$fs->delete_area_files($context->id, $component, $filearea, $itemid);
$fs->create_file_from_string($icon, $data);
ob_start();
if (!$imagefnc($im2, NULL, $quality, $filters)) {
ob_end_clean();
$fs->delete_area_files($context->id, $component, $filearea, $itemid);
return false;
}
$data = ob_get_clean();
ImageDestroy($im2);
$icon['filename'] = 'f2'.$imageext;
$fs->create_file_from_string($icon, $data);
return true;
}
i have png image which i want to have water marked.and the watermark image is a logo which is also png image...but it does not create watermark...it only shows the logo not the picture which needs to be watermarked.but when i watermark any jpeg or gif image with the png image which is logo in my case then it works correctly...i have tried to convert my imge to jpeg before watermarking even then it doen not work.
here is my code for your review..plz help me
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* gdlib.php - Collection of routines in Moodle related to
* processing images using GD
*
* @package core
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
*
* long description
* @global object
* @param object $dst_img
* @param object $src_img
* @param int $dst_x
* @param int $dst_y
* @param int $src_x
* @param int $src_y
* @param int $dst_w
* @param int $dst_h
* @param int $src_w
* @param int $src_h
* @return bool
* @todo Finish documenting this function
*/
function ImageCopyBicubic($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) {
global $CFG;
if (function_exists('ImageCopyResampled') and $CFG->gdversion >= 2) {
return ImageCopyResampled($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y,
$dst_w, $dst_h, $src_w, $src_h);
}
$totalcolors = imagecolorstotal($src_img);
for ($i=0; $i<$totalcolors; $i++) {
if ($colors = ImageColorsForIndex($src_img, $i)) {
ImageColorAllocate($dst_img, $colors['red'], $colors['green'], $colors['blue']);
}
}
$scaleX = ($src_w - 1) / $dst_w;
$scaleY = ($src_h - 1) / $dst_h;
$scaleX2 = $scaleX / 2.0;
$scaleY2 = $scaleY / 2.0;
for ($j = 0; $j < $dst_h; $j++) {
$sY = $j * $scaleY;
for ($i = 0; $i < $dst_w; $i++) {
$sX = $i * $scaleX;
$c1 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY+$scaleY2));
$c2 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX,(int)$sY));
$c3 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY+$scaleY2));
$c4 = ImageColorsForIndex($src_img,ImageColorAt($src_img,(int)$sX+$scaleX2,(int)$sY));
$red = (int) (($c1['red'] + $c2['red'] + $c3['red'] + $c4['red']) / 4);
$green = (int) (($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) / 4);
$blue = (int) (($c1['blue'] + $c2['blue'] + $c3['blue'] + $c4['blue']) / 4);
$color = ImageColorClosest ($dst_img, $red, $green, $blue);
ImageSetPixel ($dst_img, $i + $dst_x, $j + $dst_y, $color);
}
}
}
/**
* Stores optimised icon images in icon file area
*
* @param $context
* @param component
* @param $itemid
* @param $originalfile
* @return success
*/
function process_new_icon($context, $component, $filearea, $itemid, $originalfile) {
global $CFG;
if (empty($CFG->gdversion)) {
return false;
}
if (!is_file($originalfile)) {
return false;
}
$imageinfo = GetImageSize($originalfile);
if (empty($imageinfo)) {
return false;
}
$image = new stdClass();
$image->width = $imageinfo[0];
$image->height = $imageinfo[1];
$image->type = $imageinfo[2];
switch ($image->type) {
case IMAGETYPE_GIF:
if (function_exists('ImageCreateFromGIF')) {
$im = ImageCreateFromGIF($originalfile);
} else {
debugging('GIF not supported on this server');
return false;
}
break;
case IMAGETYPE_JPEG:
if (function_exists('ImageCreateFromJPEG')) {
$im = ImageCreateFromJPEG($originalfile);
} else {
debugging('JPEG not supported on this server');
return false;
}
break;
case IMAGETYPE_PNG:
if (function_exists('ImageCreateFromPNG')) {
$im = ImageCreateFromPNG($originalfile);
} else {
debugging('PNG not supported on this server');
return false;
}
break;
default:
return false;
}
if (function_exists('ImagePng')) {
$imagefnc = 'ImagePng';
$imageext = '.png';//hina
$filters = PNG_NO_FILTER;
$quality = 0;
} else if (function_exists('ImageJpeg')) {
$imagefnc = 'ImageJpeg';
$imageext = '.jpg';
$filters = null; // not used
$quality = 90;
} else {
debugging('Jpeg and png not supported on this server, please fix server configuration');
return false;
}
if (function_exists('ImageCreateTrueColor') and $CFG->gdversion >= 2) {
$im1 = ImageCreateTrueColor(100,100);
$im2 = ImageCreateTrueColor(35,35);
if ($image->type == IMAGETYPE_PNG and $imagefnc === 'ImagePng') {
imagealphablending($im1, false);
$color = imagecolorallocatealpha($im1, 0, 0, 0, 127);
imagefill($im1, 0, 0, $color);
imagesavealpha($im1, true);
imagealphablending($im2, false);
$color = imagecolorallocatealpha($im2, 0, 0, 0, 127);
imagefill($im2, 0, 0, $color);
imagesavealpha($im2, true);
}
} else {
$im1 = ImageCreate(100,100);
$im2 = ImageCreate(35,35);
}
$cx = $image->width / 2;
$cy = $image->height / 2;
if ($image->width < $image->height) {
$half = floor($image->width / 2.0);
} else {
$half = floor($image->height / 2.0);
}
ImageCopyBicubic($im1, $im, 0, 0, $cx-$half, $cy-$half, 100, 100, $half*2, $half*2);
ImageCopyBicubic($im2, $im, 0, 0, $cx-$half, $cy-$half, 35, 35, $half*2, $half*2);
//@khyam: Adding Water Mark
$wm->im1 = imagecreatefrompng($CFG->dirroot.'/pix/watermark1.png'); //creating watermakr image using png.
$wm->im2 = imagecreatefrompng($CFG->dirroot.'/pix/watermark2.png');
imagecopy($im1, $wm->im1, 0, 0, 0, 0, 100, 100); //applying watermark on profile image.
imagecopy($im2, $wm->im2, 0, 0, 0, 0, 35, 35);
//End of watermark script.
$fs = get_file_storage();
$icon = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>'/');
ob_start();
if (!$imagefnc($im1, NULL, $quality, $filters)) {
// keep old icons
ob_end_clean();
return false;
}
$data = ob_get_clean();
ImageDestroy($im1);
$icon['filename'] = 'f1'.$imageext;
$fs->delete_area_files($context->id, $component, $filearea, $itemid);
$fs->create_file_from_string($icon, $data);
ob_start();
if (!$imagefnc($im2, NULL, $quality, $filters)) {
ob_end_clean();
$fs->delete_area_files($context->id, $component, $filearea, $itemid);
return false;
}
$data = ob_get_clean();
ImageDestroy($im2);
$icon['filename'] = 'f2'.$imageext;
$fs->create_file_from_string($icon, $data);
return true;
}