Hugo Ferreira created FLEX-35370:
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Summary: TLF - Import and export base64 string image
Key: FLEX-35370
URL: https://issues.apache.org/jira/browse/FLEX-35370
Project: Apache Flex
Issue Type: New Feature
Components: TLF
Affects Versions: Apache Flex 4.16.0
Environment: Flex + AIR + Text Layout Framework
Reporter: Hugo Ferreira
TLF is a powerful framework however have a gap on a good image support or it's
incompleted.
The developer can set a Sprite with bitmap data but when try to export the
image source is exported as [Sprite object] and of course can't be restored by
import.
I fixed this issue on my side, patching the original TLF export and import and
I want to donate my patch to Apache Flex community.
In the method exportImage of the class TextLayoutExporter, replace:
if (image.source != null)
output.@source = image.source;
By:
if (image.source != null)
{
if (image.source is Sprite)
{
var sprite:Sprite = image.source as Sprite;
var bitmapData:BitmapData = new BitmapData(sprite.width,
sprite.height, true, 0x00FFFFFF);
bitmapData.draw(sprite);
var pngEncoder:PNGEncoder = new PNGEncoder();
var base64Encoder:Base64Encoder = new Base64Encoder();
base64Encoder.encodeBytes(pngEncoder.encode(bitmapData));
output.@source = "data:image/png;base64," +
base64Encoder.toString();
}
else
{
output.@source = image.source;
}
}
And in the method createInlineGraphicFromXML of the class TextLayoutImporter,
replace by this version:
public function createInlineGraphicFromXML(xmlToParse:XML):InlineGraphicElement
{
var imgElem:InlineGraphicElement = new InlineGraphicElement();
parseStandardFlowElementAttributes(imgElem,xmlToParse,_ilgElementFormatImporters);
if (_ilgFormatImporter.result)
{
var source:String = _ilgFormatImporter.result["source"];
if (source != null && source.substr(0,
"data:image/png;base64,".length) == "data:image/png;base64,")
{
var base64Decoder:Base64Decoder = new Base64Decoder();
base64Decoder.decode(source.substr("data:image/png;base64,".length));
var bitmapData:BitmapData = new
PNGDecoder().decode(base64Decoder.toByteArray());
var image:Sprite = new Sprite();
image.graphics.beginBitmapFill(bitmapData, null, true,
true);
image.graphics.drawRect(0, 0, bitmapData.width,
bitmapData.height);
image.graphics.endFill();
imgElem.source = image;
}
else
{
imgElem.source = _imageSourceResolveFunction != null ?
_imageSourceResolveFunction(source) : source;
}
// if not defined then let InlineGraphic set its own default
imgElem.height = _ilgFormatImporter.result["height"];
imgElem.width = _ilgFormatImporter.result["width"];
/* We don't support rotation yet because of bugs in the
player. */
// imgElem.rotation =
InlineGraphicElement.heightPropertyDefinition.setHelper(imgElem.rotation,_ilgFormatImporter.result["rotation"]);
imgElem.float = _ilgFormatImporter.result["float"];
}
return imgElem;
}
The only issue about this solution is that this import method relies on the
third party PNGDecoder from this source:
https://forum.starling-framework.org/topic/how-to-load-a-png-file-as-texture-with-a-sync-way
because I needed to load the image synchronously, so the Apache Flex have
several options: 1. use the case as it is, if possible; 2. create their own
version; 3. adapt the code, so that can be compatible with async way.
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