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SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented.
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/*******************************************************************************
* Copyright (c) 2000, 2008 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
*******************************************************************************/
package org.eclipse.swt.internal.image;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import java.io.*;
public final class OS2BMPFileFormat extends FileFormat {
static final int BMPFileHeaderSize = 14;
static final int BMPHeaderFixedSize = 12;
int width, height, bitCount;
boolean isFileFormat(LEDataInputStream stream) {
try {
byte[] header = new byte[18];
stream.read(header);
stream.unread(header);
int infoHeaderSize = (header[14] & 0xFF) | ((header[15] & 0xFF) << 8) | ((header[16] & 0xFF) << 16) | ((header[17] & 0xFF) << 24);
return header[0] == 0x42 && header[1] == 0x4D && infoHeaderSize == BMPHeaderFixedSize;
} catch (Exception e) {
return false;
}
}
byte[] loadData(byte[] infoHeader) {
int stride = (width * bitCount + 7) / 8;
stride = (stride + 3) / 4 * 4; // Round up to 4 byte multiple
byte[] data = loadData(infoHeader, stride);
flipScanLines(data, stride, height);
return data;
}
byte[] loadData(byte[] infoHeader, int stride) {
int dataSize = height * stride;
byte[] data = new byte[dataSize];
try {
if (inputStream.read(data) != dataSize)
SWT.error(SWT.ERROR_INVALID_IMAGE);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
return data;
}
int[] loadFileHeader() {
int[] header = new int[5];
try {
header[0] = inputStream.readShort();
header[1] = inputStream.readInt();
header[2] = inputStream.readShort();
header[3] = inputStream.readShort();
header[4] = inputStream.readInt();
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
if (header[0] != 0x4D42)
SWT.error(SWT.ERROR_INVALID_IMAGE);
return header;
}
ImageData[] loadFromByteStream() {
int[] fileHeader = loadFileHeader();
byte[] infoHeader = new byte[BMPHeaderFixedSize];
try {
inputStream.read(infoHeader);
} catch (Exception e) {
SWT.error(SWT.ERROR_IO, e);
}
width = (infoHeader[4] & 0xFF) | ((infoHeader[5] & 0xFF) << 8);
height = (infoHeader[6] & 0xFF) | ((infoHeader[7] & 0xFF) << 8);
bitCount = (infoHeader[10] & 0xFF) | ((infoHeader[11] & 0xFF) << 8);
PaletteData palette = loadPalette(infoHeader);
if (inputStream.getPosition() < fileHeader[4]) {
// Seek to the specified offset
try {
inputStream.skip(fileHeader[4] - inputStream.getPosition());
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
}
byte[] data = loadData(infoHeader);
int type = SWT.IMAGE_OS2_BMP;
return new ImageData[] {
ImageData.internal_new(
width,
height,
bitCount,
palette,
4,
data,
0,
null,
null,
-1,
-1,
type,
0,
0,
0,
0)
};
}
PaletteData loadPalette(byte[] infoHeader) {
if (bitCount <= 8) {
int numColors = 1 << bitCount;
byte[] buf = new byte[numColors * 3];
try {
if (inputStream.read(buf) != buf.length)
SWT.error(SWT.ERROR_INVALID_IMAGE);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
return paletteFromBytes(buf, numColors);
}
if (bitCount == 16) return new PaletteData(0x7C00, 0x3E0, 0x1F);
if (bitCount == 24) return new PaletteData(0xFF, 0xFF00, 0xFF0000);
return new PaletteData(0xFF00, 0xFF0000, 0xFF000000);
}
PaletteData paletteFromBytes(byte[] bytes, int numColors) {
int bytesOffset = 0;
RGB[] colors = new RGB[numColors];
for (int i = 0; i < numColors; i++) {
colors[i] = new RGB(bytes[bytesOffset + 2] & 0xFF,
bytes[bytesOffset + 1] & 0xFF,
bytes[bytesOffset] & 0xFF);
bytesOffset += 3;
}
return new PaletteData(colors);
}
/**
* Answer a byte array containing the BMP representation of
* the given device independent palette.
*/
static byte[] paletteToBytes(PaletteData pal) {
int n = pal.colors == null ? 0 : (pal.colors.length < 256 ? pal.colors.length : 256);
byte[] bytes = new byte[n * 3];
int offset = 0;
for (int i = 0; i < n; i++) {
RGB col = pal.colors[i];
bytes[offset] = (byte)col.blue;
bytes[offset + 1] = (byte)col.green;
bytes[offset + 2] = (byte)col.red;
offset += 3;
}
return bytes;
}
/**
* Unload the given image's data into the given byte stream.
* Answer the number of bytes written.
*/
int unloadData(ImageData image, OutputStream out) {
int bmpBpl = 0;
try {
int bpl = (image.width * image.depth + 7) / 8;
bmpBpl = (bpl + 3) / 4 * 4; // BMP pads scanlines to multiples of 4 bytes
int linesPerBuf = 32678 / bmpBpl;
byte[] buf = new byte[linesPerBuf * bmpBpl];
byte[] data = image.data;
int imageBpl = image.bytesPerLine;
int dataIndex = imageBpl * (image.height - 1); // Start at last line
if (image.depth == 16) {
for (int y = 0; y < image.height; y += linesPerBuf) {
int count = image.height - y;
if (linesPerBuf < count) count = linesPerBuf;
int bufOffset = 0;
for (int i = 0; i < count; i++) {
for (int wIndex = 0; wIndex < bpl; wIndex += 2) {
buf[bufOffset + wIndex + 1] = data[dataIndex + wIndex + 1];
buf[bufOffset + wIndex] = data[dataIndex + wIndex];
}
bufOffset += bmpBpl;
dataIndex -= imageBpl;
}
out.write(buf, 0, bufOffset);
}
} else {
for (int y = 0; y < image.height; y += linesPerBuf) {
int tmp = image.height - y;
int count = tmp < linesPerBuf ? tmp : linesPerBuf;
int bufOffset = 0;
for (int i = 0; i < count; i++) {
System.arraycopy(data, dataIndex, buf, bufOffset, bpl);
bufOffset += bmpBpl;
dataIndex -= imageBpl;
}
out.write(buf, 0, bufOffset);
}
}
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
return bmpBpl * image.height;
}
/**
* Unload a DeviceIndependentImage using Windows .BMP format into the given
* byte stream.
*/
void unloadIntoByteStream(ImageLoader loader) {
ImageData image = loader.data[0];
byte[] rgbs;
int numCols;
if (!((image.depth == 1) || (image.depth == 4) || (image.depth == 8) ||
(image.depth == 16) || (image.depth == 24) || (image.depth == 32)))
SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
PaletteData pal = image.palette;
if ((image.depth == 16) || (image.depth == 24) || (image.depth == 32)) {
if (!pal.isDirect)
SWT.error(SWT.ERROR_INVALID_IMAGE);
numCols = 0;
rgbs = null;
} else {
if (pal.isDirect)
SWT.error(SWT.ERROR_INVALID_IMAGE);
numCols = pal.colors.length;
rgbs = paletteToBytes(pal);
}
// Fill in file header, except for bfsize, which is done later.
int headersSize = BMPFileHeaderSize + BMPHeaderFixedSize;
int[] fileHeader = new int[5];
fileHeader[0] = 0x4D42; // Signature
fileHeader[1] = 0; // File size - filled in later
fileHeader[2] = 0; // Reserved 1
fileHeader[3] = 0; // Reserved 2
fileHeader[4] = headersSize; // Offset to data
if (rgbs != null) {
fileHeader[4] += rgbs.length;
}
// Prepare data. This is done first so we don't have to try to rewind
// the stream and fill in the details later.
ByteArrayOutputStream out = new ByteArrayOutputStream();
unloadData(image, out);
byte[] data = out.toByteArray();
// Calculate file size
fileHeader[1] = fileHeader[4] + data.length;
// Write the headers
try {
outputStream.writeShort(fileHeader[0]);
outputStream.writeInt(fileHeader[1]);
outputStream.writeShort(fileHeader[2]);
outputStream.writeShort(fileHeader[3]);
outputStream.writeInt(fileHeader[4]);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
try {
outputStream.writeInt(BMPHeaderFixedSize);
outputStream.writeShort(image.width);
outputStream.writeShort(image.height);
outputStream.writeShort(1);
outputStream.writeShort((short)image.depth);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
// Unload palette
if (numCols > 0) {
try {
outputStream.write(rgbs);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
}
// Unload the data
try {
outputStream.write(data);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
}
void flipScanLines(byte[] data, int stride, int height) {
int i1 = 0;
int i2 = (height - 1) * stride;
for (int i = 0; i < height / 2; i++) {
for (int index = 0; index < stride; index++) {
byte b = data[index + i1];
data[index + i1] = data[index + i2];
data[index + i2] = b;
}
i1 += stride;
i2 -= stride;
}
}
}