namespace Ice\Image;
use Ice\Image;
use Ice\Exception;
/**
* Gd image driver.
*
* @package Ice/Image
* @category Driver
* @author Ice Team
* @copyright (c) 2014-2023 Ice Team
* @license http://iceframework.org/license
*/
class Gd extends Image
{
protected static bundled;
protected image;
protected createFunction;
/**
* Run install check and load the image.
*
* @param string file Image file path
*
* @return void
* @throws Exception
*/
public function __construct(string file)
{
var create;
if !self::checked {
// Run the install check
self::check();
}
parent::__construct(file);
// Set the image creation function name
switch this->type {
case IMAGETYPE_JPEG:
let create = "imagecreatefromjpeg";
break;
case IMAGETYPE_GIF:
let create = "imagecreatefromgif";
break;
case IMAGETYPE_PNG:
let create = "imagecreatefrompng";
break;
}
if !create || !function_exists(create) {
throw new Exception(["Installed GD does not support %s images", image_type_to_extension(this->type, false)]);
}
// Save function for future use
let this->createFunction = create;
// Save filename for lazy loading
let this->image = this->file;
}
/**
* Checks if GD is enabled and bundled. Bundled GD is required for some methods to work.
* Exceptions will be thrown from those methods when GD is not bundled.
*
* @return boolean
*/
public static function check() -> boolean
{
var version;
if !function_exists("gd_info") {
throw new Exception("GD is either not installed or not enabled, check your configuration");
}
if defined("GD_BUNDLED") {
// Get the version via a constant
let self::bundled = GD_BUNDLED;
}
if defined("GD_VERSION") {
// Get the version via a constant
let version = GD_VERSION;
}
if !version_compare(version, "2.0.1", ">=") {
throw new Exception(["GD requires GD version %s or greater, you have %s", "2.0.1", version]);
}
let self::checked = true;
return self::checked;
}
/**
* Destroys the loaded image to free up resources.
*
* @return void
*/
public function __destruct()
{
if is_resource(this->image) {
// Free all resources
imagedestroy(this->image);
}
}
/**
* Loads an image into GD.
*
* @return void
*/
protected function loadImage() -> void
{
var create;
if !is_resource(this->image) {
// Gets create function
let create = this->createFunction;
// Open the temporary image
let this->image = {create}(this->file);
// Preserve transparency when saving
imagesavealpha(this->image, true);
}
}
/**
* Execute a resize.
*
* @param integer width New width
* @param integer height New height
*
* @return void
*/
protected function doResize(int width, int height) -> void
{
var preWidth, preHeight, reductionWidth, reductionHeight, image;
// Presize width and height
let preWidth = this->width,
preHeight = this->height;
// Loads image if not yet loaded
this->loadImage();
// Test if we can do a resize without resampling to speed up the final resize
if width > (this->width / 2) && height > (this->height / 2) {
// The maximum reduction is 10% greater than the final size
let reductionWidth = round(width * 1.1),
reductionHeight = round(height * 1.1);
while preWidth / 2 > reductionWidth && preHeight / 2 > reductionHeight {
// Reduce the size using an O(2n) algorithm, until it reaches the maximum reduction
let preWidth /= 2,
preHeight /= 2;
}
// Create the temporary image to copy to
let image = this->create(preWidth, preHeight);
if imagecopyresized(image, this->image, 0, 0, 0, 0, preWidth, preHeight, this->width, this->height) {
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = image;
}
}
// Create the temporary image to copy to
let image = this->create(width, height);
// Execute the resize
if imagecopyresampled(image, this->image, 0, 0, 0, 0, width, height, preWidth, preHeight) {
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = image;
// Reset the width and height
let this->width = imagesx(image),
this->height = imagesy(image);
}
}
/**
* Execute a crop.
*
* @param integer width New width
* @param integer height New height
* @param integer offsetX Offset from the left
* @param integer offsetY Offset from the top
*
* @return void
*/
protected function doCrop(int width, int height, int offsetX, int offsetY) -> void
{
var image;
// Create the temporary image to copy to
let image = this->create(width, height);
// Loads image if not yet loaded
this->loadImage();
// Execute the crop
if imagecopyresampled(image, this->image, 0, 0, offsetX, offsetY, width, height, width, height) {
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = image;
// Reset the width and height
let this->width = imagesx(image),
this->height = imagesy(image);
}
}
/**
* Execute a rotation.
*
* @param integer degrees Degrees to rotate
*
* @return void
*/
protected function doRotate(int degrees) -> void
{
var transparent, image, width, height;
// Loads image if not yet loaded
this->loadImage();
// Transparent black will be used as the background for the uncovered region
let transparent = imagecolorallocatealpha(this->image, 0, 0, 0, 127);
// Rotate, setting the transparent color
let image = imagerotate(this->image, 360 - degrees, transparent, 1);
// Save the alpha of the rotated image
imagesavealpha(image, true);
// Get the width and height of the rotated image
let width = imagesx(image),
height = imagesy(image);
if imagecopymerge(this->image, image, 0, 0, 0, 0, width, height, 100) {
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = image;
// Reset the width and height
let this->width = width,
this->height = height;
}
}
/**
* Execute a flip.
*
* @param integer direction Direction to flip
*
* @return void
*/
protected function doFlip(int direction) -> void
{
var flipped;
// Create the flipped image
let flipped = this->create(this->width, this->height);
// Loads image if not yet loaded
this->loadImage();
if direction === Image::HORIZONTAL {
int x = 0;
while x < this->width {
// Flip each row from top to bottom
imagecopy(flipped, this->image, x, 0, this->width - x - 1, 0, 1, this->height);
let x++;
}
} else {
int y = 0;
while y < this->height {
// Flip each column from left to right
imagecopy(flipped, this->image, 0, y, 0, this->height - y - 1, this->width, 1);
let y++;
}
}
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = flipped;
// Reset the width and height
let this->width = imagesx(flipped),
this->height = imagesy(flipped);
}
/**
* Execute a sharpen.
*
* @param integer amount Amount to sharpen
*
* @return void
*/
protected function doSharpen(int amount) -> void
{
var tmp, matrix;
// Loads image if not yet loaded
this->loadImage();
// Amount should be in the range of 18-10
let tmp = round(abs(-18 + (amount * 0.08)), 2),
amount = (int) tmp;
// Gaussian blur matrix
let matrix = [
[-1, -1, -1],
[-1, amount, -1],
[-1, -1, -1]
];
// Perform the sharpen
if imageconvolution(this->image, matrix, amount - 8, 0) {
// Reset the width and height
let this->width = imagesx(this->image),
this->height = imagesy(this->image);
}
}
/**
* Execute a reflection.
*
* @param integer height Reflection height
* @param integer opacity Reflection opacity
* @param boolean fadeIn True to fade out, false to fade in
*
* @return void
*/
protected function doReflection(int height, int opacity, boolean fadeIn) -> void
{
var tmp, srcY, dstY, dstOpacity, stepping, reflection, line;
// Loads image if not yet loaded
this->loadImage();
// Convert an opacity range of 0-100 to 127-0
let tmp = round(abs((opacity * 127 / 100) - 127)),
opacity = (int) tmp;
if opacity < 127 {
// Calculate the opacity stepping
let stepping = (127 - opacity) / height;
} else {
// Avoid a "divide by zero" error
let stepping = 127 / height;
}
// Create the reflection image
let reflection = this->create(this->width, this->height + height);
// Copy the image to the reflection
imagecopy(reflection, this->image, 0, 0, 0, 0, this->width, this->height);
int offset = 0;
while height >= offset {
// Read the next line down
let srcY = this->height - offset - 1;
// Place the line at the bottom of the reflection
let dstY = this->height + offset;
if fadeIn === true {
// Start with the most transparent line first
let dstOpacity = round(opacity + (stepping * (height - offset)));
} else {
// Start with the most opaque line first
let dstOpacity = round(opacity + (stepping * offset));
}
// Create a single line of the image
let line = this->create(this->width, 1);
// Copy a single line from the current image into the line
imagecopy(line, this->image, 0, 0, 0, srcY, this->width, 1);
// Colorize the line to add the correct alpha level
imagefilter(line, IMG_FILTER_COLORIZE, 0, 0, 0, dstOpacity);
// Copy a the line into the reflection
imagecopy(reflection, line, 0, dstY, 0, 0, this->width, 1);
let offset++;
}
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = reflection;
// Reset the width and height
let this->width = imagesx(reflection),
this->height = imagesy(reflection);
}
/**
* Execute a watermarking.
*
* @param Image image Watermarking Image
* @param integer offsetX Offset from the left
* @param integer offsetY Offset from the top
* @param integer opacity Opacity of watermark
*
* @return void
*/
protected function doWatermark( watermark, int offsetX, int offsetY, int opacity) -> void
{
var tmp, overlay, width, height, color;
// Loads image if not yet loaded
this->loadImage();
// Create the watermark image resource
let overlay = imagecreatefromstring(watermark->render());
imagesavealpha(overlay, true);
// Get the width and height of the watermark
let width = imagesx(overlay),
height = imagesy(overlay);
if opacity < 100 {
// Convert an opacity range of 0-100 to 127-0
let tmp = round(abs((opacity * 127 / 100) - 127)),
opacity = (int) tmp;
// Allocate transparent gray
let color = imagecolorallocatealpha(overlay, 127, 127, 127, opacity);
// The transparent image will overlay the watermark
imagelayereffect(overlay, IMG_EFFECT_OVERLAY);
// Fill the background with the transparent color
imagefilledrectangle(overlay, 0, 0, width, height, color);
}
// Alpha blending must be enabled on the background!
imagealphablending(this->image, true);
if imagecopy(this->image, overlay, offsetX, offsetY, 0, 0, width, height) {
// Destroy the overlay image
imagedestroy(overlay);
}
}
/**
* Execute a background.
*
* @param integer r Red
* @param integer g Green
* @param integer b Blue
* @param integer opacity Opacity
*
* @return void
*/
protected function doBackground(int r, int g, int b, int opacity) -> void
{
var tmp, background, color;
// Loads image if not yet loaded
this->loadImage();
// Convert an opacity range of 0-100 to 127-0
let tmp = round(abs((opacity * 127 / 100) - 127)),
opacity = (int) tmp;
// Create a new background
let background = this->create(this->width, this->height);
// Allocate the color
let color = imagecolorallocatealpha(background, r, g, b, opacity);
// Fill the image with white
imagefilledrectangle(background, 0, 0, this->width, this->height, color);
// Alpha blending must be enabled on the background!
imagealphablending(background, true);
// Copy the image onto a white background to remove all transparency
if imagecopy(background, this->image, 0, 0, 0, 0, this->width, this->height) {
// Swap the new image for the old one
imagedestroy(this->image);
let this->image = background;
}
}
/**
* Execute a save.
*
* @param string file New image filename
* @param integer quality Quality
*
* @return boolean
*/
protected function doSave(string file, var quality = null) -> boolean
{
var tmp, extension, save, type, status;
// Loads image if not yet loaded
this->loadImage();
// Get the extension of the file
let extension = pathinfo(file, PATHINFO_EXTENSION);
// Get the save function and IMAGETYPE
let tmp = this->saveFunction(extension, quality),
save = tmp[0],
type = tmp[1],
quality = tmp[2];
// Save the image to a file
let status = quality ? {save}(this->image, file, quality) : {save}(this->image, file);
if status === true && type !== this->type {
// Reset the image type and mime type
let this->type = type,
this->mime = image_type_to_mime_type(type);
}
return true;
}
/**
* Execute a render.
*
* @param string type Image type: png, jpg, gif, etc
* @param integer quality Quality
*
* @return string
*/
protected function doRender(string type, quality) -> string
{
var tmp, save, status;
// Loads image if not yet loaded
this->loadImage();
// Get the save function and IMAGETYPE
let tmp = this->saveFunction(type, quality),
save = tmp[0],
type = (string) tmp[1],
quality = tmp[2];
// Capture the output
ob_start();
// Render the image
let status = quality ? {save}(this->image, null, quality) : {save}(this->image, null);
if status === true && type !== this->type {
// Reset the image type and mime type
let this->type = type,
this->mime = image_type_to_mime_type(type);
}
return ob_get_clean();
}
/**
* Get the GD saving function and image type for this extension.
* Also normalizes the quality setting
*
* @param string extension Image type: png, jpg, etc
* @param integer quality Image quality
* @return array Save function, IMAGETYPE_* constant
* @throws Exception
*/
protected function saveFunction(string extension, int quality) -> array
{
var tmp, save, type;
if !extension {
// Use the current image type
let tmp = image_type_to_extension(this->type, false),
extension = (string) tmp;
}
switch strtolower(extension) {
case "jpg":
case "jpeg":
// Save a JPG file
let save = "imagejpeg",
type = IMAGETYPE_JPEG;
break;
case "gif":
// Save a GIF file
let save = "imagegif",
type = IMAGETYPE_GIF;
// GIFs do not a quality setting
let quality = null;
break;
case "png":
// Save a PNG file
let save = "imagepng",
type = IMAGETYPE_PNG;
// Use a compression level of 9 (does not affect quality!)
let quality = 9;
break;
default:
throw new Exception(["Installed GD does not support %s images", extension]);
}
return [save, type, quality];
}
/**
* Create an empty image with the given width and height.
*
* @param integer width Image width
* @param integer height Image height
*
* @return resource
*/
protected function create(int width, int height) -> resource
{
var image;
// Create an empty image
let image = imagecreatetruecolor(width, height);
// Do not apply alpha blending
imagealphablending(image, false);
// Save alpha levels
imagesavealpha(image, true);
return image;
}
}
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