/*
* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.java.swing.plaf.nimbus;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Insets;
/**
* ImageScalingHelper
*
* @author Created by Jasper Potts (Aug 8, 2007)
*/
class ImageScalingHelper {
/** Enumeration for the types of painting this class can handle. */
enum PaintType {
/**
* Painting type indicating the image should be centered in the space provided. When used the <code>mask</code>
* is ignored.
*/
CENTER,
/**
* Painting type indicating the image should be tiled across the specified width and height. When used the
* <code>mask</code> is ignored.
*/
TILE,
/**
* Painting type indicating the image should be split into nine regions with the top, left, bottom and right
* areas stretched.
*/
PAINT9_STRETCH,
/**
* Painting type indicating the image should be split into nine regions with the top, left, bottom and right
* areas tiled.
*/
PAINT9_TILE
}
;
private static final Insets EMPTY_INSETS = new Insets(0, 0, 0, 0);
static final int PAINT_TOP_LEFT = 1;
static final int PAINT_TOP = 2;
static final int PAINT_TOP_RIGHT = 4;
static final int PAINT_LEFT = 8;
static final int PAINT_CENTER = 16;
static final int PAINT_RIGHT = 32;
static final int PAINT_BOTTOM_RIGHT = 64;
static final int PAINT_BOTTOM = 128;
static final int PAINT_BOTTOM_LEFT = 256;
/**
* Specifies that all regions should be painted. If this is set any other regions specified will not be painted.
* For example PAINT_ALL | PAINT_CENTER will paint all but the center.
*/
static final int PAINT_ALL = 512;
/**
* Paints using the algorightm specified by <code>paintType</code>.
*
* @param g Graphics to render to
* @param x X-coordinate
* @param y Y-coordinate
* @param w Width to render to
* @param h Height to render to
* @param image Image to render from, if <code>null</code> this method will do nothing
* @param sInsets Insets specifying the portion of the image that will be stretched or tiled, if <code>null</code>
* empty <code>Insets</code> will be used.
* @param dInsets Destination insets specifying the portion of the image will be stretched or tiled, if
* <code>null</code> empty <code>Insets</code> will be used.
* @param paintType Specifies what type of algorithm to use in painting
* @param mask Specifies portion of image to render, if <code>PAINT_ALL</code> is specified, any other regions
* specified will not be painted, for example PAINT_ALL | PAINT_CENTER paints everything but the
* center.
*/
public static void paint(Graphics g, int x, int y, int w, int h,
Image image, Insets sInsets,
Insets dInsets, PaintType paintType, int mask) {
if (image == null || image.getWidth(null) <= 0 || image.getHeight(null) <= 0) {
return;
}
if (sInsets == null) {
sInsets = EMPTY_INSETS;
}
if (dInsets == null) {
dInsets = EMPTY_INSETS;
}
int iw = image.getWidth(null);
int ih = image.getHeight(null);
if (paintType == PaintType.CENTER) {
// Center the image
g.drawImage(image, x + (w - iw) / 2,
y + (h - ih) / 2, null);
} else if (paintType == PaintType.TILE) {
// Tile the image
int lastIY = 0;
for (int yCounter = y, maxY = y + h; yCounter < maxY;
yCounter += (ih - lastIY), lastIY = 0) {
int lastIX = 0;
for (int xCounter = x, maxX = x + w; xCounter < maxX;
xCounter += (iw - lastIX), lastIX = 0) {
int dx2 = Math.min(maxX, xCounter + iw - lastIX);
int dy2 = Math.min(maxY, yCounter + ih - lastIY);
g.drawImage(image, xCounter, yCounter, dx2, dy2,
lastIX, lastIY, lastIX + dx2 - xCounter,
lastIY + dy2 - yCounter, null);
}
}
} else {
int st = sInsets.top;
int sl = sInsets.left;
int sb = sInsets.bottom;
int sr = sInsets.right;
int dt = dInsets.top;
int dl = dInsets.left;
int db = dInsets.bottom;
int dr = dInsets.right;
// Constrain the insets to the size of the image
if (st + sb > ih) {
db = dt = sb = st = Math.max(0, ih / 2);
}
if (sl + sr > iw) {
dl = dr = sl = sr = Math.max(0, iw / 2);
}
// Constrain the insets to the size of the region we're painting
// in.
if (dt + db > h) {
dt = db = Math.max(0, h / 2 - 1);
}
if (dl + dr > w) {
dl = dr = Math.max(0, w / 2 - 1);
}
boolean stretch = (paintType == PaintType.PAINT9_STRETCH);
if ((mask & PAINT_ALL) != 0) {
mask = (PAINT_ALL - 1) & ~mask;
}
if ((mask & PAINT_LEFT) != 0) {
drawChunk(image, g, stretch, x, y + dt, x + dl, y + h - db,
0, st, sl, ih - sb, false);
}
if ((mask & PAINT_TOP_LEFT) != 0) {
drawImage(image, g, x, y, x + dl, y + dt,
0, 0, sl, st);
}
if ((mask & PAINT_TOP) != 0) {
drawChunk(image, g, stretch, x + dl, y, x + w - dr, y + dt,
sl, 0, iw - sr, st, true);
}
if ((mask & PAINT_TOP_RIGHT) != 0) {
drawImage(image, g, x + w - dr, y, x + w, y + dt,
iw - sr, 0, iw, st);
}
if ((mask & PAINT_RIGHT) != 0) {
drawChunk(image, g, stretch,
x + w - dr, y + dt, x + w, y + h - db,
iw - sr, st, iw, ih - sb, false);
}
if ((mask & PAINT_BOTTOM_RIGHT) != 0) {
drawImage(image, g, x + w - dr, y + h - db, x + w, y + h,
iw - sr, ih - sb, iw, ih);
}
if ((mask & PAINT_BOTTOM) != 0) {
drawChunk(image, g, stretch,
x + dl, y + h - db, x + w - dr, y + h,
sl, ih - sb, iw - sr, ih, true);
}
if ((mask & PAINT_BOTTOM_LEFT) != 0) {
drawImage(image, g, x, y + h - db, x + dl, y + h,
0, ih - sb, sl, ih);
}
if ((mask & PAINT_CENTER) != 0) {
drawImage(image, g, x + dl, y + dt, x + w - dr, y + h - db,
sl, st, iw - sr, ih - sb);
}
}
}
/**
* Draws a portion of an image, stretched or tiled.
*
* @param image Image to render.
* @param g Graphics to render to
* @param stretch Whether the image should be stretched or timed in the
* provided space.
* @param dx1 X origin to draw to
* @param dy1 Y origin to draw to
* @param dx2 End x location to draw to
* @param dy2 End y location to draw to
* @param sx1 X origin to draw from
* @param sy1 Y origin to draw from
* @param sx2 Max x location to draw from
* @param sy2 Max y location to draw from
* @param xDirection Used if the image is not stretched. If true it
* indicates the image should be tiled along the x axis.
*/
private static void drawChunk(Image image, Graphics g, boolean stretch,
int dx1, int dy1, int dx2, int dy2, int sx1,
int sy1, int sx2, int sy2,
boolean xDirection) {
if (dx2 - dx1 <= 0 || dy2 - dy1 <= 0 || sx2 - sx1 <= 0 ||
sy2 - sy1 <= 0) {
// Bogus location, nothing to paint
return;
}
if (stretch) {
g.drawImage(image, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, null);
}
else {
int xSize = sx2 - sx1;
int ySize = sy2 - sy1;
int deltaX;
int deltaY;
if (xDirection) {
deltaX = xSize;
deltaY = 0;
}
else {
deltaX = 0;
deltaY = ySize;
}
while (dx1 < dx2 && dy1 < dy2) {
int newDX2 = Math.min(dx2, dx1 + xSize);
int newDY2 = Math.min(dy2, dy1 + ySize);
g.drawImage(image, dx1, dy1, newDX2, newDY2,
sx1, sy1, sx1 + newDX2 - dx1,
sy1 + newDY2 - dy1, null);
dx1 += deltaX;
dy1 += deltaY;
}
}
}
private static void drawImage(Image image, Graphics g,
int dx1, int dy1, int dx2, int dy2, int sx1,
int sy1, int sx2, int sy2) {
// PENDING: is this necessary, will G2D do it for me?
if (dx2 - dx1 <= 0 || dy2 - dy1 <= 0 || sx2 - sx1 <= 0 ||
sy2 - sy1 <= 0) {
// Bogus location, nothing to paint
return;
}
g.drawImage(image, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, null);
}
}