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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Part of the Processing project - http://processing.org
Copyright (c) 2004-14 Ben Fry and Casey Reas
Copyright (c) 2001-04 Massachusetts Institute of Technology
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
*/
package processing.core;
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.util.Iterator;
import javax.imageio.*;
import javax.imageio.metadata.*;
/**
* ( begin auto-generated from PImage.xml )
*
* Datatype for storing images. Processing can display <b>.gif</b>,
* <b>.jpg</b>, <b>.tga</b>, and <b>.png</b> images. Images may be
* displayed in 2D and 3D space. Before an image is used, it must be loaded
* with the <b>loadImage()</b> function. The <b>PImage</b> class contains
* fields for the <b>width</b> and <b>height</b> of the image, as well as
* an array called <b>pixels[]</b> that contains the values for every pixel
* in the image. The methods described below allow easy access to the
* image's pixels and alpha channel and simplify the process of compositing.<br/>
* <br/> using the <b>pixels[]</b> array, be sure to use the
* <b>loadPixels()</b> method on the image to make sure that the pixel data
* is properly loaded.<br/>
* <br/> create a new image, use the <b>createImage()</b> function. Do not
* use the syntax <b>new PImage()</b>.
*
* ( end auto-generated )
*
* @webref image
* @usage Web & Application
* @instanceName pimg any object of type PImage
* @see PApplet#loadImage(String)
* @see PApplet#imageMode(int)
* @see PApplet#createImage(int, int, int)
*/
public class PImage implements PConstants, Cloneable {
/**
* Format for this image, one of RGB, ARGB or ALPHA.
* note that RGB images still require 0xff in the high byte
* because of how they'll be manipulated by other functions
*/
public int format;
/**
* ( begin auto-generated from pixels.xml )
*
* Array containing the values for all the pixels in the display window.
* These values are of the color datatype. This array is the size of the
* display window. For example, if the image is 100x100 pixels, there will
* be 10000 values and if the window is 200x300 pixels, there will be 60000
* values. The <b>index</b> value defines the position of a value within
* the array. For example, the statement <b>color b = pixels[230]</b> will
* set the variable <b>b</b> to be equal to the value at that location in
* the array.<br />
* <br />
* Before accessing this array, the data must loaded with the
* <b>loadPixels()</b> function. After the array data has been modified,
* the <b>updatePixels()</b> function must be run to update the changes.
* Without <b>loadPixels()</b>, running the code may (or will in future
* releases) result in a NullPointerException.
*
* ( end auto-generated )
*
* @webref image:pixels
* @usage web_application
* @brief Array containing the color of every pixel in the image
*/
public int[] pixels;
/** 1 for most images, 2 for hi-dpi/retina */
public int pixelDensity = 1;
/** Actual dimensions of pixels array, taking into account the 2x setting. */
public int pixelWidth;
public int pixelHeight;
/**
* ( begin auto-generated from PImage_width.xml )
*
* The width of the image in units of pixels.
*
* ( end auto-generated )
* @webref pimage:field
* @usage web_application
* @brief Image width
*/
public int width;
/**
* ( begin auto-generated from PImage_height.xml )
*
* The height of the image in units of pixels.
*
* ( end auto-generated )
* @webref pimage:field
* @usage web_application
* @brief Image height
*/
public int height;
/**
* Path to parent object that will be used with save().
* This prevents users from needing savePath() to use PImage.save().
*/
public PApplet parent;
// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
/** modified portion of the image */
protected boolean modified;
protected int mx1, my1, mx2, my2;
/** Loaded pixels flag */
public boolean loaded = false;
// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
// private fields
private int fracU, ifU, fracV, ifV, u1, u2, v1, v2, sX, sY, iw, iw1, ih1;
private int ul, ll, ur, lr, cUL, cLL, cUR, cLR;
private int srcXOffset, srcYOffset;
private int r, g, b, a;
private int[] srcBuffer;
// fixed point precision is limited to 15 bits!!
static final int PRECISIONB = 15;
static final int PRECISIONF = 1 << PRECISIONB;
static final int PREC_MAXVAL = PRECISIONF-1;
static final int PREC_ALPHA_SHIFT = 24-PRECISIONB;
static final int PREC_RED_SHIFT = 16-PRECISIONB;
// internal kernel stuff for the gaussian blur filter
private int blurRadius;
private int blurKernelSize;
private int[] blurKernel;
private int[][] blurMult;
// colour component bitmasks (moved from PConstants in 2.0b7)
public static final int ALPHA_MASK = 0xff000000;
public static final int RED_MASK = 0x00ff0000;
public static final int GREEN_MASK = 0x0000ff00;
public static final int BLUE_MASK = 0x000000ff;
//////////////////////////////////////////////////////////////
/**
* ( begin auto-generated from PImage.xml )
*
* Datatype for storing images. Processing can display <b>.gif</b>,
* <b>.jpg</b>, <b>.tga</b>, and <b>.png</b> images. Images may be
* displayed in 2D and 3D space. Before an image is used, it must be loaded
* with the <b>loadImage()</b> function. The <b>PImage</b> object contains
* fields for the <b>width</b> and <b>height</b> of the image, as well as
* an array called <b>pixels[]</b> which contains the values for every
* pixel in the image. A group of methods, described below, allow easy
* access to the image's pixels and alpha channel and simplify the process
* of compositing.
* <br/> <br/>
* Before using the <b>pixels[]</b> array, be sure to use the
* <b>loadPixels()</b> method on the image to make sure that the pixel data
* is properly loaded.
* <br/> <br/>
* To create a new image, use the <b>createImage()</b> function (do not use
* <b>new PImage()</b>).
* ( end auto-generated )
* @nowebref
* @usage web_application
* @see PApplet#loadImage(String, String)
* @see PApplet#imageMode(int)
* @see PApplet#createImage(int, int, int)
*/
public PImage() {
format = ARGB; // default to ARGB images for release 0116
pixelDensity = 1;
}
/**
* @nowebref
* @param width image width
* @param height image height
*/
public PImage(int width, int height) {
init(width, height, RGB, 1);
// toxi: is it maybe better to init the image with max alpha enabled?
//for(int i=0; i<pixels.length; i++) pixels[i]=0xffffffff;
// fry: i'm opting for the full transparent image, which is how
// photoshop works, and our audience oughta be familiar with.
// also, i want to avoid having to set all those pixels since
// in java it's super slow, and most using this fxn will be
// setting all the pixels anyway.
// toxi: agreed and same reasons why i left it out ;)
}
/**
* @nowebref
* @param format Either RGB, ARGB, ALPHA (grayscale alpha channel)
*/
public PImage(int width, int height, int format) {
init(width, height, format, 1);
}
public PImage(int width, int height, int format, int factor) {
init(width, height, format, factor);
}
/**
* Do not remove, see notes in the other variant.
*/
public void init(int width, int height, int format) { // ignore
init(width, height, format, 1);
}
/**
* Function to be used by subclasses of PImage to init later than
* at the constructor, or re-init later when things changes.
* Used by Capture and Movie classes (and perhaps others),
* because the width/height will not be known when super() is called.
* (Leave this public so that other libraries can do the same.)
*/
public void init(int width, int height, int format, int factor) { // ignore
this.width = width;
this.height = height;
this.format = format;
this.pixelDensity = factor;
pixelWidth = width * pixelDensity;
pixelHeight = height * pixelDensity;
this.pixels = new int[pixelWidth * pixelHeight];
}
/**
* Check the alpha on an image, using a really primitive loop.
*/
protected void checkAlpha() {
if (pixels == null) return;
for (int i = 0; i < pixels.length; i++) {
// since transparency is often at corners, hopefully this
// will find a non-transparent pixel quickly and exit
if ((pixels[i] & 0xff000000) != 0xff000000) {
format = ARGB;
break;
}
}
}
//////////////////////////////////////////////////////////////
/**
* Construct a new PImage from a java.awt.Image. This constructor assumes
* that you've done the work of making sure a MediaTracker has been used
* to fully download the data and that the img is valid.
*
* @nowebref
* @param img assumes a MediaTracker has been used to fully download
* the data and the img is valid
*/
public PImage(Image img) {
format = RGB;
if (img instanceof BufferedImage) {
BufferedImage bi = (BufferedImage) img;
width = bi.getWidth();
height = bi.getHeight();
int type = bi.getType();
if (type == BufferedImage.TYPE_3BYTE_BGR ||
type == BufferedImage.TYPE_4BYTE_ABGR) {
pixels = new int[width * height];
bi.getRGB(0, 0, width, height, pixels, 0, width);
if (type == BufferedImage.TYPE_4BYTE_ABGR) {
format = ARGB;
} else {
opaque();
}
} else {
DataBuffer db = bi.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
pixels = ((DataBufferInt) db).getData();
if (type == BufferedImage.TYPE_INT_ARGB) {
format = ARGB;
} else if (type == BufferedImage.TYPE_INT_RGB) {
opaque();
}
}
}
}
// Implements fall-through if not DataBufferInt above, or not a
// known type, or not DataBufferInt for the data itself.
if (pixels == null) { // go the old school Java 1.0 route
width = img.getWidth(null);
height = img.getHeight(null);
pixels = new int[width * height];
PixelGrabber pg =
new PixelGrabber(img, 0, 0, width, height, pixels, 0, width);
try {
pg.grabPixels();
} catch (InterruptedException e) { }
}
pixelDensity = 1;
pixelWidth = width;
pixelHeight = height;
}
/**
* Use the getNative() method instead, which allows library interfaces to be
* written in a cross-platform fashion for desktop, Android, and others.
* This is still included for PGraphics objects, which may need the image.
*/
public Image getImage() { // ignore
return (Image) getNative();
}
/**
* Returns a native BufferedImage from this PImage.
*/
public Object getNative() { // ignore
loadPixels();
int type = (format == RGB) ?
BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
BufferedImage image = new BufferedImage(pixelWidth, pixelHeight, type);
WritableRaster wr = image.getRaster();
wr.setDataElements(0, 0, pixelWidth, pixelHeight, pixels);
return image;
}
//////////////////////////////////////////////////////////////
// MARKING IMAGE AS MODIFIED / FOR USE w/ GET/SET
public boolean isModified() { // ignore
return modified;
}
public void setModified() { // ignore
modified = true;
mx1 = 0;
my1 = 0;
mx2 = pixelWidth;
my2 = pixelHeight;
}
public void setModified(boolean m) { // ignore
modified = m;
}
public int getModifiedX1() { // ignore
return mx1;
}
public int getModifiedX2() { // ignore
return mx2;
}
public int getModifiedY1() { // ignore
return my1;
}
public int getModifiedY2() { // ignore
return my2;
}
/**
* ( begin auto-generated from PImage_loadPixels.xml )
*
* Loads the pixel data for the image into its <b>pixels[]</b> array. This
* function must always be called before reading from or writing to <b>pixels[]</b>.
* <br/><br/> renderers may or may not seem to require <b>loadPixels()</b>
* or <b>updatePixels()</b>. However, the rule is that any time you want to
* manipulate the <b>pixels[]</b> array, you must first call
* <b>loadPixels()</b>, and after changes have been made, call
* <b>updatePixels()</b>. Even if the renderer may not seem to use this
* function in the current Processing release, this will always be subject
* to change.
*
* ( end auto-generated )
*
* <h3>Advanced</h3>
* Call this when you want to mess with the pixels[] array.
* <p/>
* For subclasses where the pixels[] buffer isn't set by default,
* this should copy all data into the pixels[] array
*
* @webref pimage:pixels
* @brief Loads the pixel data for the image into its pixels[] array
* @usage web_application
*/
public void loadPixels() { // ignore
if (pixels == null || pixels.length != pixelWidth*pixelHeight) {
pixels = new int[pixelWidth*pixelHeight];
}
setLoaded();
}
public void updatePixels() { // ignore
updatePixels(0, 0, pixelWidth, pixelHeight);
}
/**
* ( begin auto-generated from PImage_updatePixels.xml )
*
* Updates the image with the data in its <b>pixels[]</b> array. Use in
* conjunction with <b>loadPixels()</b>. If you're only reading pixels from
* the array, there's no need to call <b>updatePixels()</b>.
* <br/><br/> renderers may or may not seem to require <b>loadPixels()</b>
* or <b>updatePixels()</b>. However, the rule is that any time you want to
* manipulate the <b>pixels[]</b> array, you must first call
* <b>loadPixels()</b>, and after changes have been made, call
* <b>updatePixels()</b>. Even if the renderer may not seem to use this
* function in the current Processing release, this will always be subject
* to change.
* <br/> <br/>
* Currently, none of the renderers use the additional parameters to
* <b>updatePixels()</b>, however this may be implemented in the future.
*
* ( end auto-generated )
* <h3>Advanced</h3>
* Mark the pixels in this region as needing an update.
* This is not currently used by any of the renderers, however the api
* is structured this way in the hope of being able to use this to
* speed things up in the future.
* @webref pimage:pixels
* @brief Updates the image with the data in its pixels[] array
* @usage web_application
* @param x x-coordinate of the upper-left corner
* @param y y-coordinate of the upper-left corner
* @param w width
* @param h height
*/
public void updatePixels(int x, int y, int w, int h) { // ignore
int x2 = x + w;
int y2 = y + h;
if (!modified) {
mx1 = PApplet.max(0, x);
mx2 = PApplet.min(pixelWidth, x2);
my1 = PApplet.max(0, y);
my2 = PApplet.min(pixelHeight, y2);
modified = true;
} else {
if (x < mx1) mx1 = PApplet.max(0, x);
if (x > mx2) mx2 = PApplet.min(pixelWidth, x);
if (y < my1) my1 = PApplet.max(0, y);
if (y > my2) my2 = PApplet.min(pixelHeight, y);
if (x2 < mx1) mx1 = PApplet.max(0, x2);
if (x2 > mx2) mx2 = PApplet.min(pixelWidth, x2);
if (y2 < my1) my1 = PApplet.max(0, y2);
if (y2 > my2) my2 = PApplet.min(pixelHeight, y2);
}
}
//////////////////////////////////////////////////////////////
// COPYING IMAGE DATA
/**
* Duplicate an image, returns new PImage object.
* The pixels[] array for the new object will be unique
* and recopied from the source image. This is implemented as an
* override of Object.clone(). We recommend using get() instead,
* because it prevents you from needing to catch the
* CloneNotSupportedException, and from doing a cast from the result.
*/
@Override
public Object clone() throws CloneNotSupportedException { // ignore
return get();
}
/**
* ( begin auto-generated from PImage_resize.xml )
*
* Resize the image to a new width and height. To make the image scale
* proportionally, use 0 as the value for the <b>wide</b> or <b>high</b>
* parameter. For instance, to make the width of an image 150 pixels, and
* change the height using the same proportion, use resize(150, 0).<br />
* <br />
* Even though a PGraphics is technically a PImage, it is not possible to
* rescale the image data found in a PGraphics. (It's simply not possible
* to do this consistently across renderers: technically infeasible with
* P3D, or what would it even do with PDF?) If you want to resize PGraphics
* content, first get a copy of its image data using the <b>get()</b>
* method, and call <b>resize()</b> on the PImage that is returned.
*
* ( end auto-generated )
* @webref pimage:method
* @brief Changes the size of an image to a new width and height
* @usage web_application
* @param w the resized image width
* @param h the resized image height
* @see PImage#get(int, int, int, int)
*/
public void resize(int w, int h) { // ignore
if (w <= 0 && h <= 0) {
throw new IllegalArgumentException("width or height must be > 0 for resize");
}
if (w == 0) { // Use height to determine relative size
float diff = (float) h / (float) height;
w = (int) (width * diff);
} else if (h == 0) { // Use the width to determine relative size
float diff = (float) w / (float) width;
h = (int) (height * diff);
}
BufferedImage img =
shrinkImage((BufferedImage) getNative(), w*pixelDensity, h*pixelDensity);
PImage temp = new PImage(img);
this.pixelWidth = temp.width;
this.pixelHeight = temp.height;
// Get the resized pixel array
this.pixels = temp.pixels;
this.width = pixelWidth / pixelDensity;
this.height = pixelHeight / pixelDensity;
// Mark the pixels array as altered
updatePixels();
}
// Adapted from getFasterScaledInstance() method from page 111 of
// "Filthy Rich Clients" by Chet Haase and Romain Guy
// Additional modifications and simplifications have been added,
// plus a fix to deal with an infinite loop if images are expanded.
// http://code.google.com/p/processing/issues/detail?id=1463
static private BufferedImage shrinkImage(BufferedImage img,
int targetWidth, int targetHeight) {
int type = (img.getTransparency() == Transparency.OPAQUE) ?
BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
BufferedImage outgoing = img;
BufferedImage scratchImage = null;
Graphics2D g2 = null;
int prevW = outgoing.getWidth();
int prevH = outgoing.getHeight();
boolean isTranslucent = img.getTransparency() != Transparency.OPAQUE;
// Use multi-step technique: start with original size, then scale down in
// multiple passes with drawImage() until the target size is reached
int w = img.getWidth();
int h = img.getHeight();
do {
if (w > targetWidth) {
w /= 2;
// if this is the last step, do the exact size
if (w < targetWidth) {
w = targetWidth;
}
} else if (targetWidth >= w) {
w = targetWidth;
}
if (h > targetHeight) {
h /= 2;
if (h < targetHeight) {
h = targetHeight;
}
} else if (targetHeight >= h) {
h = targetHeight;
}
if (scratchImage == null || isTranslucent) {
// Use a single scratch buffer for all iterations and then copy
// to the final, correctly-sized image before returning
scratchImage = new BufferedImage(w, h, type);
g2 = scratchImage.createGraphics();
}
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(outgoing, 0, 0, w, h, 0, 0, prevW, prevH, null);
prevW = w;
prevH = h;
outgoing = scratchImage;
} while (w != targetWidth || h != targetHeight);
if (g2 != null) {
g2.dispose();
}
// If we used a scratch buffer that is larger than our target size,
// create an image of the right size and copy the results into it
if (targetWidth != outgoing.getWidth() ||
targetHeight != outgoing.getHeight()) {
scratchImage = new BufferedImage(targetWidth, targetHeight, type);
g2 = scratchImage.createGraphics();
g2.drawImage(outgoing, 0, 0, null);
g2.dispose();
outgoing = scratchImage;
}
return outgoing;
}
//////////////////////////////////////////////////////////////
// MARKING IMAGE AS LOADED / FOR USE IN RENDERERS
public boolean isLoaded() { // ignore
return loaded;
}
public void setLoaded() { // ignore
loaded = true;
}
public void setLoaded(boolean l) { // ignore
loaded = l;
}
//////////////////////////////////////////////////////////////
// GET/SET PIXELS
/**
* ( begin auto-generated from PImage_get.xml )
*
* Reads the color of any pixel or grabs a section of an image. If no
* parameters are specified, the entire image is returned. Use the <b>x</b>
* and <b>y</b> parameters to get the value of one pixel. Get a section of
* the display window by specifying an additional <b>width</b> and
* <b>height</b> parameter. When getting an image, the <b>x</b> and
* <b>y</b> parameters define the coordinates for the upper-left corner of
* the image, regardless of the current <b>imageMode()</b>.<br />
* <br />
* If the pixel requested is outside of the image window, black is
* returned. The numbers returned are scaled according to the current color
* ranges, but only RGB values are returned by this function. For example,
* even though you may have drawn a shape with <b>colorMode(HSB)</b>, the
* numbers returned will be in RGB format.<br />
* <br />
* Getting the color of a single pixel with <b>get(x, y)</b> is easy, but
* not as fast as grabbing the data directly from <b>pixels[]</b>. The
* equivalent statement to <b>get(x, y)</b> using <b>pixels[]</b> is
* <b>pixels[y*width+x]</b>. See the reference for <b>pixels[]</b> for more information.
*
* ( end auto-generated )
*
* <h3>Advanced</h3>
* Returns an ARGB "color" type (a packed 32 bit int with the color.
* If the coordinate is outside the image, zero is returned
* (black, but completely transparent).
* <P>
* If the image is in RGB format (i.e. on a PVideo object),
* the value will get its high bits set, just to avoid cases where
* they haven't been set already.
* <P>
* If the image is in ALPHA format, this returns a white with its
* alpha value set.
* <P>
* This function is included primarily for beginners. It is quite
* slow because it has to check to see if the x, y that was provided
* is inside the bounds, and then has to check to see what image
* type it is. If you want things to be more efficient, access the
* pixels[] array directly.
*
* @webref image:pixels
* @brief Reads the color of any pixel or grabs a rectangle of pixels
* @usage web_application
* @param x x-coordinate of the pixel
* @param y y-coordinate of the pixel
* @see PApplet#set(int, int, int)
* @see PApplet#pixels
* @see PApplet#copy(PImage, int, int, int, int, int, int, int, int)
*/
public int get(int x, int y) {
if ((x < 0) || (y < 0) || (x >= pixelWidth) || (y >= pixelHeight)) return 0;
switch (format) {
case RGB:
return pixels[y*pixelWidth + x] | 0xff000000;
case ARGB:
return pixels[y*pixelWidth + x];
case ALPHA:
return (pixels[y*pixelWidth + x] << 24) | 0xffffff;
}
return 0;
}
/**
* @param w width of pixel rectangle to get
* @param h height of pixel rectangle to get
*/
public PImage get(int x, int y, int w, int h) {
int targetX = 0;
int targetY = 0;
int targetWidth = w;
int targetHeight = h;
boolean cropped = false;
if (x < 0) {
w += x; // x is negative, removes the left edge from the width
targetX = -x;
cropped = true;
x = 0;
}
if (y < 0) {
h += y; // y is negative, clip the number of rows
targetY = -y;
cropped = true;
y = 0;
}
if (x + w > pixelWidth) {
w = pixelWidth - x;
cropped = true;
}
if (y + h > pixelHeight) {
h = pixelHeight - y;
cropped = true;
}
if (w < 0) {
w = 0;
}
if (h < 0) {
h = 0;
}
int targetFormat = format;
if (cropped && format == RGB) {
targetFormat = ARGB;
}
PImage target = new PImage(targetWidth / pixelDensity,
targetHeight / pixelDensity,
targetFormat, pixelDensity);
target.parent = parent; // parent may be null so can't use createImage()
if (w > 0 && h > 0) {
getImpl(x, y, w, h, target, targetX, targetY);
}
return target;
}
/**
* Returns a copy of this PImage. Equivalent to get(0, 0, width, height).
* Deprecated, just use copy() instead.
*/
public PImage get() {
// Formerly this used clone(), which caused memory problems.
// http://code.google.com/p/processing/issues/detail?id=42
return get(0, 0, pixelWidth, pixelHeight);
}
public PImage copy() {
return get(0, 0, pixelWidth, pixelHeight);
}
/**
* Internal function to actually handle getting a block of pixels that
* has already been properly cropped to a valid region. That is, x/y/w/h
* are guaranteed to be inside the image space, so the implementation can
* use the fastest possible pixel copying method.
*/
protected void getImpl(int sourceX, int sourceY,
int sourceWidth, int sourceHeight,
PImage target, int targetX, int targetY) {
int sourceIndex = sourceY*pixelWidth + sourceX;
int targetIndex = targetY*target.pixelWidth + targetX;
for (int row = 0; row < sourceHeight; row++) {
System.arraycopy(pixels, sourceIndex, target.pixels, targetIndex, sourceWidth);
sourceIndex += pixelWidth;
targetIndex += target.pixelWidth;
}
}
/**
* ( begin auto-generated from PImage_set.xml )
*
* Changes the color of any pixel or writes an image directly into the
* display window.<br />
* <br />
* The <b>x</b> and <b>y</b> parameters specify the pixel to change and the
* <b>color</b> parameter specifies the color value. The color parameter is
* affected by the current color mode (the default is RGB values from 0 to
* 255). When setting an image, the <b>x</b> and <b>y</b> parameters define
* the coordinates for the upper-left corner of the image, regardless of
* the current <b>imageMode()</b>.
* <br /><br />
* Setting the color of a single pixel with <b>set(x, y)</b> is easy, but
* not as fast as putting the data directly into <b>pixels[]</b>. The
* equivalent statement to <b>set(x, y, #000000)</b> using <b>pixels[]</b>
* is <b>pixels[y*width+x] = #000000</b>. See the reference for
* <b>pixels[]</b> for more information.
*
* ( end auto-generated )
*
* @webref image:pixels
* @brief writes a color to any pixel or writes an image into another
* @usage web_application
* @param x x-coordinate of the pixel
* @param y y-coordinate of the pixel
* @param c any value of the color datatype
* @see PImage#get(int, int, int, int)
* @see PImage#pixels
* @see PImage#copy(PImage, int, int, int, int, int, int, int, int)
*/
public void set(int x, int y, int c) {
if ((x < 0) || (y < 0) || (x >= pixelWidth) || (y >= pixelHeight)) return;
pixels[y*pixelWidth + x] = c;
updatePixels(x, y, 1, 1); // slow...
}
/**
* <h3>Advanced</h3>
* Efficient method of drawing an image's pixels directly to this surface.
* No variations are employed, meaning that any scale, tint, or imageMode
* settings will be ignored.
*
* @param img image to copy into the original image
*/
public void set(int x, int y, PImage img) {
int sx = 0;
int sy = 0;
int sw = img.pixelWidth;
int sh = img.pixelHeight;
if (x < 0) { // off left edge
sx -= x;
sw += x;
x = 0;
}
if (y < 0) { // off top edge
sy -= y;
sh += y;
y = 0;
}
if (x + sw > pixelWidth) { // off right edge
sw = pixelWidth - x;
}
if (y + sh > pixelHeight) { // off bottom edge
sh = pixelHeight - y;
}
// this could be nonexistent
if ((sw <= 0) || (sh <= 0)) return;
setImpl(img, sx, sy, sw, sh, x, y);
}
/**
* Internal function to actually handle setting a block of pixels that
* has already been properly cropped from the image to a valid region.
*/
protected void setImpl(PImage sourceImage,
int sourceX, int sourceY,
int sourceWidth, int sourceHeight,
int targetX, int targetY) {
int sourceOffset = sourceY * sourceImage.pixelWidth + sourceX;
int targetOffset = targetY * pixelWidth + targetX;
for (int y = sourceY; y < sourceY + sourceHeight; y++) {
System.arraycopy(sourceImage.pixels, sourceOffset, pixels, targetOffset, sourceWidth);
sourceOffset += sourceImage.pixelWidth;
targetOffset += pixelWidth;
}
//updatePixelsImpl(targetX, targetY, sourceWidth, sourceHeight);
updatePixels(targetX, targetY, sourceWidth, sourceHeight);
}
//////////////////////////////////////////////////////////////
// ALPHA CHANNEL
/**
* @param maskArray array of integers used as the alpha channel, needs to be
* the same length as the image's pixel array.
*/
public void mask(int[] maskArray) { // ignore
loadPixels();
// don't execute if mask image is different size
if (maskArray.length != pixels.length) {
throw new IllegalArgumentException("mask() can only be used with an image that's the same size.");
}
for (int i = 0; i < pixels.length; i++) {
pixels[i] = ((maskArray[i] & 0xff) << 24) | (pixels[i] & 0xffffff);
}
format = ARGB;
updatePixels();
}
/**
* ( begin auto-generated from PImage_mask.xml )
*
* Masks part of an image from displaying by loading another image and
* using it as an alpha channel. This mask image should only contain
* grayscale data, but only the blue color channel is used. The mask image
* needs to be the same size as the image to which it is applied.<br />
* <br />
* In addition to using a mask image, an integer array containing the alpha
* channel data can be specified directly. This method is useful for
* creating dynamically generated alpha masks. This array must be of the
* same length as the target image's pixels array and should contain only
* grayscale data of values between 0-255.
*
* ( end auto-generated )
*
* <h3>Advanced</h3>
*
* Set alpha channel for an image. Black colors in the source
* image will make the destination image completely transparent,
* and white will make things fully opaque. Gray values will
* be in-between steps.
* <P>
* Strictly speaking the "blue" value from the source image is
* used as the alpha color. For a fully grayscale image, this
* is correct, but for a color image it's not 100% accurate.
* For a more accurate conversion, first use filter(GRAY)
* which will make the image into a "correct" grayscale by
* performing a proper luminance-based conversion.
*
* @webref pimage:method
* @usage web_application
* @param img image to use as the mask
* @brief Masks part of an image with another image as an alpha channel
*/
public void mask(PImage img) {
img.loadPixels();
mask(img.pixels);
}
//////////////////////////////////////////////////////////////
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