Mercurial > projects > dwt-mac
view dwt/internal/image/PngEncoder.d @ 0:380af2bdd8e5
Upload of whole dwt tree
author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
---|---|
date | Sat, 09 Aug 2008 17:00:02 +0200 |
parents | |
children | 1a8b3cb347e0 |
line wrap: on
line source
/******************************************************************************* * Copyright (c) 2000, 2006 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ module dwt.internal.image; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; import dwt.DWT; import dwt.graphics.ImageData; import dwt.graphics.ImageLoader; import dwt.graphics.RGB; import dwt.internal.Compatibility; final class PngEncoder : Object { static final byte SIGNATURE[] = {(byte) '\211', (byte) 'P', (byte) 'N', (byte) 'G', (byte) '\r', (byte) '\n', (byte) '\032', (byte) '\n'}; static final byte TAG_IHDR[] = {(byte) 'I', (byte) 'H', (byte) 'D', (byte) 'R'}; static final byte TAG_PLTE[] = {(byte) 'P', (byte) 'L', (byte) 'T', (byte) 'E'}; static final byte TAG_TRNS[] = {(byte) 't', (byte) 'R', (byte) 'N', (byte) 'S'}; static final byte TAG_IDAT[] = {(byte) 'I', (byte) 'D', (byte) 'A', (byte) 'T'}; static final byte TAG_IEND[] = {(byte) 'I', (byte) 'E', (byte) 'N', (byte) 'D'}; ByteArrayOutputStream bytes = new ByteArrayOutputStream(1024); PngChunk chunk; ImageLoader loader; ImageData data; int transparencyType; int width, height, bitDepth, colorType; int compressionMethod = 0; int filterMethod = 0; int interlaceMethod = 0; public PngEncoder(ImageLoader loader) { this.loader = loader; this.data = loader.data[0]; this.transparencyType = data.getTransparencyType(); this.width = data.width; this.height = data.height; this.bitDepth = 8; this.colorType = 2; if (data.palette.isDirect) { if (transparencyType is DWT.TRANSPARENCY_ALPHA) { this.colorType = 6; } } else { this.colorType = 3; } if (!(colorType is 2 || colorType is 3 || colorType is 6)) DWT.error(DWT.ERROR_INVALID_IMAGE); } void writeShort(ByteArrayOutputStream baos, int theShort) { byte byte1 = (byte) ((theShort >> 8) & 0xff); byte byte2 = (byte) (theShort & 0xff); byte[] temp = {byte1, byte2}; baos.write(temp, 0, 2); } void writeInt(ByteArrayOutputStream baos, int theInt) { byte byte1 = (byte) ((theInt >> 24) & 0xff); byte byte2 = (byte) ((theInt >> 16) & 0xff); byte byte3 = (byte) ((theInt >> 8) & 0xff); byte byte4 = (byte) (theInt & 0xff); byte[] temp = {byte1, byte2, byte3, byte4}; baos.write(temp, 0, 4); } void writeChunk(byte[] tag, byte[] buffer) { int bufferLength = (buffer !is null) ? buffer.length : 0; chunk = new PngChunk(bufferLength); writeInt(bytes, bufferLength); bytes.write(tag, 0, 4); chunk.setType(tag); if (bufferLength !is 0) { bytes.write(buffer, 0, bufferLength); chunk.setData(buffer); } else { chunk.setCRC(chunk.computeCRC()); } writeInt(bytes, chunk.getCRC()); } void writeSignature() { bytes.write(SIGNATURE, 0, 8); } void writeHeader() { ByteArrayOutputStream baos = new ByteArrayOutputStream(13); writeInt(baos, width); writeInt(baos, height); baos.write(bitDepth); baos.write(colorType); baos.write(compressionMethod); baos.write(filterMethod); baos.write(interlaceMethod); writeChunk(TAG_IHDR, baos.toByteArray()); } void writePalette() { RGB[] RGBs = data.palette.getRGBs(); if (RGBs.length > 256) DWT.error(DWT.ERROR_INVALID_IMAGE); ByteArrayOutputStream baos = new ByteArrayOutputStream(RGBs.length); for (int i = 0; i < RGBs.length; i++) { baos.write((byte) RGBs[i].red); baos.write((byte) RGBs[i].green); baos.write((byte) RGBs[i].blue); } writeChunk(TAG_PLTE, baos.toByteArray()); } void writeTransparency() { ByteArrayOutputStream baos = new ByteArrayOutputStream(); switch (transparencyType) { case DWT.TRANSPARENCY_ALPHA: int pixelValue, alphaValue; byte[] alphas = new byte[data.palette.getRGBs().length]; for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { pixelValue = data.getPixel(x, y); alphaValue = data.getAlpha(x, y); alphas[pixelValue] = (byte) alphaValue; } } baos.write(alphas, 0, alphas.length); break; case DWT.TRANSPARENCY_PIXEL: int pixel = data.transparentPixel; if (colorType is 2) { int redMask = data.palette.redMask; int redShift = data.palette.redShift; int greenMask = data.palette.greenMask; int greenShift = data.palette.greenShift; int blueShift = data.palette.blueShift; int blueMask = data.palette.blueMask; int r = pixel & redMask; r = (redShift < 0) ? r >>> -redShift : r << redShift; int g = pixel & greenMask; g = (greenShift < 0) ? g >>> -greenShift : g << greenShift; int b = pixel & blueMask; b = (blueShift < 0) ? b >>> -blueShift : b << blueShift; writeShort(baos, r); writeShort(baos, g); writeShort(baos, b); } if (colorType is 3) { byte[] padding = new byte[pixel + 1]; for (int i = 0; i < pixel; i++) { padding[i] = (byte) 255; } padding[pixel] = (byte) 0; baos.write(padding, 0, padding.length); } break; } writeChunk(TAG_TRNS, baos.toByteArray()); } void writeImageData() throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(1024); OutputStream os = Compatibility.newDeflaterOutputStream(baos); if (os is null) os = baos; if (colorType is 3) { byte[] lineData = new byte[width]; for (int y = 0; y < height; y++) { int filter = 0; os.write(filter); data.getPixels(0, y, width, lineData, 0); for (int x = 0; x < lineData.length; x++) { os.write(lineData[x]); } } } else { int[] lineData = new int[width]; byte[] alphaData = null; if (colorType is 6) { alphaData = new byte[width]; } int redMask = data.palette.redMask; int redShift = data.palette.redShift; int greenMask = data.palette.greenMask; int greenShift = data.palette.greenShift; int blueShift = data.palette.blueShift; int blueMask = data.palette.blueMask; for (int y = 0; y < height; y++) { int filter = 0; os.write(filter); data.getPixels(0, y, width, lineData, 0); if (colorType is 6) { data.getAlphas(0, y, width, alphaData, 0); } for (int x = 0; x < lineData.length; x++) { int pixel = lineData[x]; int r = pixel & redMask; r = (redShift < 0) ? r >>> -redShift : r << redShift; int g = pixel & greenMask; g = (greenShift < 0) ? g >>> -greenShift : g << greenShift; int b = pixel & blueMask; b = (blueShift < 0) ? b >>> -blueShift : b << blueShift; os.write(r); os.write(g); os.write(b); if (colorType is 6) { os.write(alphaData[x]); } } } } os.flush(); os.close(); byte[] compressed = baos.toByteArray(); if (os is baos) { PngDeflater deflater = new PngDeflater(); compressed = deflater.deflate(compressed); } writeChunk(TAG_IDAT, compressed); } void writeEnd() { writeChunk(TAG_IEND, null); } public void encode(LEDataOutputStream outputStream) { try { writeSignature(); writeHeader(); if (colorType is 3) { writePalette(); } bool transparencyAlpha = (transparencyType is DWT.TRANSPARENCY_ALPHA); bool transparencyPixel = (transparencyType is DWT.TRANSPARENCY_PIXEL); bool type2Transparency = (colorType is 2 && transparencyPixel); bool type3Transparency = (colorType is 3 && (transparencyAlpha || transparencyPixel)); if (type2Transparency || type3Transparency) { writeTransparency(); } writeImageData(); writeEnd(); outputStream.write(bytes.toByteArray()); } catch (IOException e) { DWT.error(DWT.ERROR_IO, e); } } }