我在网站上使用闪存程序在传输之前调整图片大小，以保留我的带宽。
但是，当我尝试传输具有透明度的.png文件时，调整大小不会保持.png文件结果的透明度。 在......之后使用它是一个问题。
这段代码：
public class ImageStrip extends MovieClip
{
var _img:Bitmap;
public var _iHelper:imgHelper;
public var fileName:String;
public var isEncoding:Boolean=false;
public var isDirty:Boolean = true;
public var encodedByteArray:ByteArray;
private var asyncEncoder:AsyncJPEGEncoder;
private static const _MAX_WIDTH : Number = 800;
private static const _MAX_HEIGHT : Number = 800;
public function ImageStrip(img:Bitmap, fileName:String) {
stripSelected.alpha=stripOver.alpha = 0;
this.fileName=(fileName.substr(0, fileName.search("z-z-z-z")));
var fSize:String = (fileName.substr(fileName.search("z-z-z-z") + 7));
var fName:String;
if (this.fileName.length<15)
fName = this.fileName;
else
fName = this.fileName.substr(0,14)+'.. ';
fName += " "+fSize;
removeBT.addEventListener(MouseEvent.CLICK, eventRemoveClicked);
_img = new Bitmap(img.bitmapData);
caption.text = fName;
_iHelper = new imgHelper(_img);
_iHelper.addEventListener("invalidate", eventImageInvalidated);
addChild(_iHelper);
_iHelper.resizePic(44, 44, true);
_iHelper.x = _iHelper.y = 4;
addEventListener(MouseEvent.CLICK, eventMouseClicked);
addEventListener(MouseEvent.ROLL_OVER, eventOver);
addEventListener(MouseEvent.ROLL_OUT, eventOut);
addEventListener(Event.ADDED_TO_STAGE, onAdded);
pbar.mode = ProgressBarMode.MANUAL;
pbar.reset();
pbar.setProgress(0, 1);
doEncode();
}
public function onAdded(e:Event):void
{
removeBT.label = Local.getInstance().getString("remove");
}
public function eventImageInvalidated(e:*=null) {
pbar.reset();
pbar.visible = true;
pbar.setProgress(0, 1);
doEncode();
}
public function doEncode() {
if (!asyncEncoder){
asyncEncoder = new AsyncJPEGEncoder(90);
asyncEncoder.addEventListener("complete", eventJpgComleted);
asyncEncoder.addEventListener("progress", eventJpgProgress);
}
else {
asyncEncoder.cancel();
}
var btData:BitmapData = _iHelper.resizeBitmapData(_MAX_WIDTH, _MAX_HEIGHT);
isEncoding = true;
encodedByteArray = asyncEncoder.encode(btData);
}
private function eventJpgComleted(e:*) {
isEncoding = false;
isDirty = false;
pbar.visible = false;
}
private function eventJpgProgress(e:ProgressEvent) {
//trace('Progress : : ' + e.bytesLoaded / e.bytesTotal);
var pbar:ProgressBar = pbar as ProgressBar;
pbar.value = (e.bytesLoaded / e.bytesTotal);
}
public function set isUploading(value:Boolean) {
pbar.indeterminate = value;
pbar.visible = value;
}
public function set selected(flag:Boolean) {
if (flag)
TweenLite.to(stripSelected, 0.6, { autoAlpha:1 } );
else
TweenLite.to(stripSelected, 0.6, { autoAlpha:0 } );
}
private function eventOver(e:MouseEvent) {
TweenLite.to(stripOver, 0.6, { autoAlpha:1 } );
}
private function eventOut(e:MouseEvent) {
TweenLite.to(stripOver, 0.6, { autoAlpha:0 } );
}
private function eventRemoveClicked(E:MouseEvent) {
dispatchEvent(new Event("removeStrip", true, true));
}
private function eventMouseClicked(e:MouseEvent) {
e.stopImmediatePropagation();
// not the remove button ...
if (!(e.target is Button))
dispatchEvent(new Event("stripClicked", true, true));
}
}
这个功能：
public class imgBox extends MovieClip
{
public var _img : imgHelper;
private var _MAX_WIDTH : Number;
private var _MAX_HEIGHT : Number;
private var boxFrame:MovieClip;
private var statusMsg:TextField;
public var byteData:ByteArray;
[Embed(source="rotate_right.png")]
[Bindable]
public var iconSymbol1:Class;
[Embed(source="rotate_left.png")]
[Bindable]
public var iconSymbol2:Class;
public function imgBox(w:Number,h:Number,_bitmap:Bitmap)
{
_MAX_WIDTH = w;
_MAX_HEIGHT = h;
var borderColor:uint = 0x666666;
var borderSize:uint = 1;
var vMenu:verticalMenu;
_img = new imgHelper(_bitmap);
_img.addEventListener("invalidate", eventImageInvalidated);
if ( _bitmap.width > _MAX_WIDTH || _bitmap.height > _MAX_HEIGHT )
_img.resizePic(_MAX_WIDTH, _MAX_HEIGHT, false);
boxFrame = new MovieClip;
boxFrame.graphics.lineStyle(borderSize, borderColor);
boxFrame.graphics.drawRect(0, 0, _img.width+4,_img.height+4);
addChild(boxFrame);
addChild(_img);
boxFrame.x = 60 + _img.theImage.x;
boxFrame.y = _img.theImage.y;
_img.x = 62;
_img.y = 2;
//vMenu = new verticalMenu();
//var myMenu:Array = new Array( { label:'Rotate', _function:eventRotateHit } );// ,
// { label:'Upload', _function:eventUploadHit } );
//vMenu.buildMenu(myMenu);
var button:Button = new Button();
//button.label = Local.getInstance().getString("rotateright");
button.setStyle("icon", iconSymbol1);
button.width = 48;
button.height = 48;
button.addEventListener(MouseEvent.CLICK, eventRotateHit);
addChild(button);
var buttonbis:Button = new Button();
//buttonbis.label = Local.getInstance().getString("rotate");
buttonbis.setStyle("icon", iconSymbol2);
buttonbis.width = 48;
buttonbis.height = 48;
buttonbis.y = 60;
buttonbis.addEventListener(MouseEvent.CLICK, eventRotateHit2);
addChild(buttonbis);
}
private function eventImageInvalidated(e:Event) {
e.stopImmediatePropagation();
dispatchEvent(new Event("invalidate", true, true));// invalidate for re-encoding the image.
}
private function eventUploadHit(e:*) {
trace('Upload Hit');
this.dispatchEvent(new Event("uploadImage"));
}
public function showStatus(msg:String) {
TweenLite.to(boxFrame, 0.5, { height: _img.height + 24 } );
var vMenu:verticalMenu = new verticalMenu();;
if (statusMsg){
removeChild(statusMsg);
statusMsg = null;
}
statusMsg = new TextField();
statusMsg.htmlText = msg;
statusMsg.styleSheet = vMenu._textStyleSheet;
statusMsg.width = _img.width;
addChild(statusMsg);
statusMsg.y = _img.height + 2;
statusMsg.x = boxFrame.x + 10;
}
public function hideStatus(msg:String = "") {
if (statusMsg){
removeChild(statusMsg);
statusMsg = null;
}
TweenLite.to(boxFrame, 0.5, { height: _img.height + 4 } );
}
private function eventRotateHit(e:*) {
trace('rotate Image');
if (statusMsg){
removeChild(statusMsg);
statusMsg = null;
}
_img.rotate(Math.PI / 2);
_img.resizePic(_MAX_WIDTH, _MAX_HEIGHT, false);
boxFrame.width = _img.width + 4;
boxFrame.height = _img.height + 4;
boxFrame.x = 60 + _img.theImage.x;
boxFrame.y = _img.theImage.y;
}
private function eventRotateHit2(e:*) {
trace('rotate Image');
if (statusMsg){
removeChild(statusMsg);
statusMsg = null;
}
_img.rotate(Math.PI/-2);
_img.resizePic(_MAX_WIDTH, _MAX_HEIGHT, false);
boxFrame.width = _img.width + 4;
boxFrame.height = _img.height + 4;
boxFrame.x = 60 + _img.theImage.x;
boxFrame.y = _img.theImage.y;
}
public function dispose() {
}
public function prepare(w:Number, h:Number, q:Number) {
var btData:BitmapData = _img.resizeBitmapData(w, h);
byteData = new JPGEncoder(q).encode(btData);
}
}
这里是imgHelper代码：
public class imgHelper extends MovieClip
{
public var tt:TextField;
public var theImage:Bitmap;
private var myMask:MovieClip;
private var _boxDimW:Number;
private var _boxDimH:Number;
public function imgHelper(img:Bitmap=null)
{
theImage = img;
if (theImage)
addChild(theImage);
tt = new TextField;
tt.text = '0%';
/* addChild(tt);*/
}
public override function get width():Number {
return theImage.width;
}
public override function get height():Number {
return theImage.height;
}
public function get _scaleX():Number {
return theImage.scaleX;
}
public function set _scaleX(sx) {
theImage.scaleX = sx;
}
public function get _scaleY():Number {
return theImage.scaleY;
}
public function set _scaleY(sy:Number) {
theImage.scaleY = sy;
}
public function load(url:String)
{
//trace('loading : ' + url);
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, picLoaded);
loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, errLoading);
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progress);
var lContext:LoaderContext = new LoaderContext(true);
var request:URLRequest = new URLRequest(url);
try {
loader.load(request,lContext);
} catch (error:Error) {
trace("Unable to load requested document.");
}
}
private function progress(e:ProgressEvent)
{
tt.text = Math.round(e.bytesLoaded /e.bytesTotal *100) + '%';
}
private function errLoading(e:*)
{
tt.visible = false;
dispatchEvent(new Event("imgLoaded",true,true));
}
private function picLoaded(e:*)
{
var picLoader:Loader = Loader(e.target.loader);
theImage = Bitmap(picLoader.content);
addChild(theImage);
tt.visible = false;
dispatchEvent(new Event("imgLoaded",true,true));
}
public function resizePic(rW:Number,rH:Number,crop:Boolean=false)
{
var img = theImage;
_boxDimW = rW;
_boxDimH = rH;
if (img.width > img.height)
{
img.width = rW;
img.height = img.height * img.scaleX;
}
else
{
img.height = rH;
img.width = img.width * img.scaleY;
}
if (crop)
{
if (img.width < img.height)
{
var oldScaleX = img.scaleX;
img.width = rW;
img.scaleY += img.scaleX-oldScaleX;
}
else
{
var oldScaleY = img.scaleY;
img.height = rH;
img.scaleX += img.scaleY-oldScaleY;
}
maskIt(rW, rH);
}
else {
if (img.height < img.width) {
img.y=(rH-img.height)/2
}
else {
img.x=(rW-img.width)/2
}
}
}
public function resizeBitmapData (rW:Number, rH:Number):BitmapData {
var img:Bitmap = new Bitmap(theImage.bitmapData);
trace('resize bitmap : ' + img.height + '-' + img.width);
trace('resize bitmap : ' + rH + '-' + rW);
if (img.width > img.height) {
if (img.height>rH)
rH = img.height * (rW / img.width);
else{ // do not resize
rH = img.height;
rW = img.width;
}
}
else {
if (img.width>rW)
rW = img.width * (rH / img.height);
else{ // do not resize
rH = img.height;
rW = img.width;
}
}
var bmpData:BitmapData = new BitmapData(rW, rH);
var scaleMatrix:Matrix = new Matrix( rW / img.width , 0, 0, rH / img.height , 0,0);
var colorTransform:ColorTransform = new ColorTransform();
bmpData.draw(theImage, scaleMatrix , colorTransform, null, null, true);
return (bmpData);
}
public function rotate(dir:Number) {
var workingImage:Bitmap = new Bitmap(theImage.bitmapData.clone());
var bmpData:BitmapData = new BitmapData(workingImage.height, workingImage.width);
if (dir > 0)
{
var transMatrix:Matrix = new Matrix(Math.cos(dir),Math.sin(dir),-Math.sin(dir),Math.cos(dir), workingImage.height,0);
}
else
{
var transMatrix:Matrix = new Matrix(Math.cos(dir),Math.sin(dir),-Math.sin(dir),Math.cos(dir),0, workingImage.width);
}
var colorTransform:ColorTransform = new ColorTransform();
bmpData.draw(workingImage, transMatrix, colorTransform, null, null, true);
TweenLite.to(theImage, 0.5, { autoAlpha:0 } );
//removeChild(theImage);
theImage = new Bitmap(bmpData);
addChild(theImage);
//trace(theImage.y + '--' + theImage.x+'--'+theImage.height+'--'+theImage.width);
if (theImage.height < theImage.width) {
theImage.y += (_boxDimH - theImage.height) / 2
}
else {
theImage.x +=(_boxDimW-theImage.width)/2
}
theImage.alpha = 0;
TweenLite.to(theImage, 1, { autoAlpha:1 } );
trace('sending event !');
dispatchEvent(new Event("invalidate", true, true));// invalidate for re-encoding the image.
}
public function maskIt(w:Number, h:Number)
{
if (myMask) {
removeChild(myMask);
myMask = null;
}
myMask = new MovieClip();
myMask.graphics.beginFill(0xFFCC00);
myMask.graphics.drawRect(0, 0, w,h);
addChild(myMask);
this.mask = myMask;
}
public function dispose() {
}
}
AsyncJPGEncoder：
package Classes.utils
{
import flash.display.BitmapData;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.IEventDispatcher;
import flash.events.ProgressEvent;
import flash.utils.ByteArray;
import flash.utils.setInterval;
import flash.utils.clearInterval;
import com.adobe.images.JPGEncoder;
import com.adobe.images.BitString;
[Event(name="progress", type="flash.events.ProgressEvent")]
[Event(name="complete", type="flash.events.Event")]
[Event(name="cancel", type="flash.events.Event")]
public class AsyncJPEGEncoder extends JPGEncoder implements IEventDispatcher
{
private var _dispatcher:EventDispatcher;
private var _encodeTimer:int;
private var DCY:Number;
private var DCU:Number;
private var DCV:Number;
private var _ypos:int;
public var attachedImageStrip:Number = -1;
public function AsyncJPEGEncoder(quality:Number=50)
{
super(quality);
_dispatcher = new EventDispatcher(this);
}
/**
* Created a JPEG image from the specified BitmapData
*
* @param image The BitmapData that will be converted into the JPEG format.
* @return a ByteArray representing the JPEG encoded image data.
* @langversion ActionScript 3.0
* @playerversion Flash 9.0
* @tiptext
*/
override public function encode(image:BitmapData):ByteArray
{
// Initialize bit writer
byteout = new ByteArray();
bytenew=0;
bytepos=7;
// Add JPEG headers
writeWord(0xFFD8); // SOI
writeAPP0();
writeDQT();
writeSOF0(image.width,image.height);
writeDHT();
writeSOS();
// Encode 8x8 macroblocks
DCY=0;
DCU=0;
DCV=0;
bytenew=0;
bytepos=7;
_ypos = 0;
flash.utils.clearInterval(_encodeTimer);
_encodeTimer = flash.utils.setInterval(doEncode, 1, image);
return byteout;
}
import flash.display.Stage;
private function doEncode(image:BitmapData):void
{
for (var xpos:int=0; xpos<image.width; xpos+=8)
{
RGB2YUV(image, xpos, _ypos);
DCY = processDU(YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT);
DCU = processDU(UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
DCV = processDU(VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
}
_ypos += 8;
var e:ProgressEvent = new ProgressEvent(ProgressEvent.PROGRESS);
if (_ypos<image.height)
{
e.bytesLoaded = _ypos;
e.bytesTotal = image.height;
dispatchEvent(e);
}
else
{
flash.utils.clearInterval(_encodeTimer);
e.bytesLoaded = image.height;
e.bytesTotal = image.height;
dispatchEvent(e);
finishEncode();
}
}
private function finishEncode():void
{
// Do the bit alignment of the EOI marker
if ( bytepos >= 0 ) {
var fillbits:BitString = new BitString();
fillbits.len = bytepos+1;
fillbits.val = (1<<(bytepos+1))-1;
writeBits(fillbits);
}
writeWord(0xFFD9); //EOI
//return byteout;
var e:Event = new Event(Event.COMPLETE);
dispatchEvent(e);
}
public function cancel():void
{
var e:Event = new Event(Event.CANCEL);
dispatchEvent(e);
flash.utils.clearInterval(_encodeTimer);
}
public function getBytes():ByteArray
{
return byteout;
}
public function addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void{
_dispatcher.addEventListener(type, listener, useCapture, priority);
}
public function dispatchEvent(evt:Event):Boolean{
return _dispatcher.dispatchEvent(evt);
}
public function hasEventListener(type:String):Boolean{
return _dispatcher.hasEventListener(type);
}
public function removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void{
_dispatcher.removeEventListener(type, listener, useCapture);
}
public function willTrigger(type:String):Boolean {
return _dispatcher.willTrigger(type);
}
}
}
非常感谢你的帮助！
佛瑞德
答案 0 :(得分：0)
正如我在评论中提到的，如果你需要输出透明度，你可能应该使用PNG编码器而不是JPEG。
查看imgHelper类，有几个地方可以创建BitmapData对象，但是不指定它们应该允许透明度。要做到这一点，他们应该看起来像：
new BitmapData(width,height,true,0);
第三个参数是将透明度设置为true，第四个参数是删除背景颜色。