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org.eclipse.swt.internal.image.WinBMPFileFormat Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2011 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 WinBMPFileFormat extends FileFormat {
static final int BMPFileHeaderSize = 14;
static final int BMPHeaderFixedSize = 40;
int importantColors;
Point pelsPerMeter = new Point(0, 0);
/**
* Compress numBytes bytes of image data from src, storing in dest
* (starting at 0), using the technique specified by comp.
* If last is true, this indicates the last line of the image.
* Answer the size of the compressed data.
*/
int compress(int comp, byte[] src, int srcOffset, int numBytes, byte[] dest, boolean last) {
if (comp == 1) { // BMP_RLE8_COMPRESSION
return compressRLE8Data(src, srcOffset, numBytes, dest, last);
}
if (comp == 2) { // BMP_RLE4_COMPRESSION
return compressRLE4Data(src, srcOffset, numBytes, dest, last);
}
SWT.error(SWT.ERROR_INVALID_IMAGE);
return 0;
}
int compressRLE4Data(byte[] src, int srcOffset, int numBytes, byte[] dest, boolean last) {
int sp = srcOffset, end = srcOffset + numBytes, dp = 0;
int size = 0, left, i, n;
byte theByte;
while (sp < end) {
/* find two consecutive bytes that are the same in the next 128 */
left = end - sp - 1;
if (left > 127)
left = 127;
for (n = 0; n < left; n++) {
if (src[sp + n] == src[sp + n + 1])
break;
}
/* if there is only one more byte in the scan line, include it */
if (n < 127 && n == left)
n++;
/* store the intervening data */
switch (n) {
case 0:
break;
case 1: /* handled separately because 0,2 is a command */
dest[dp] = 2; dp++; /* 1 byte == 2 pixels */
dest[dp] = src[sp];
dp++; sp++;
size += 2;
break;
default:
dest[dp] = 0; dp++;
dest[dp] = (byte)(n + n); dp++; /* n bytes = n*2 pixels */
for (i = n; i > 0; i--) {
dest[dp] = src[sp];
dp++; sp++;
}
size += 2 + n;
if ((n & 1) != 0) { /* pad to word */
dest[dp] = 0;
dp++;
size++;
}
break;
}
/* find the length of the next run (up to 127) and store it */
left = end - sp;
if (left > 0) {
if (left > 127)
left = 127;
theByte = src[sp];
for (n = 1; n < left; n++) {
if (src[sp + n] != theByte)
break;
}
dest[dp] = (byte)(n + n); dp++; /* n bytes = n*2 pixels */
dest[dp] = theByte; dp++;
sp += n;
size += 2;
}
}
/* store the end of line or end of bitmap codes */
dest[dp] = 0; dp++;
if (last) {
dest[dp] = 1; dp++;
} else {
dest[dp] = 0; dp++;
}
size += 2;
return size;
}
int compressRLE8Data(byte[] src, int srcOffset, int numBytes, byte[] dest, boolean last) {
int sp = srcOffset, end = srcOffset + numBytes, dp = 0;
int size = 0, left, i, n;
byte theByte;
while (sp < end) {
/* find two consecutive bytes that are the same in the next 256 */
left = end - sp - 1;
if (left > 254)
left = 254;
for (n = 0; n < left; n++) {
if (src[sp + n] == src[sp + n + 1])
break;
}
/* if there is only one more byte in the scan line, include it */
if (n == left)
n++;
/* store the intervening data */
switch (n) {
case 0:
break;
case 2: /* handled separately because 0,2 is a command */
dest[dp] = 1; dp++;
dest[dp] = src[sp];
dp++; sp++;
size += 2;
/* don't break, fall through */
case 1: /* handled separately because 0,1 is a command */
dest[dp] = 1; dp++;
dest[dp] = src[sp];
dp++; sp++;
size += 2;
break;
default:
dest[dp] = 0; dp++;
dest[dp] = (byte)n; dp++;
for (i = n; i > 0; i--) {
dest[dp] = src[sp];
dp++; sp++;
}
size += 2 + n;
if ((n & 1) != 0) { /* pad to word */
dest[dp] = 0;
dp++;
size++;
}
break;
}
/* find the length of the next run (up to 255) and store it */
left = end - sp;
if (left > 0) {
if (left > 255)
left = 255;
theByte = src[sp];
for (n = 1; n < left; n++) {
if (src[sp + n] != theByte)
break;
}
dest[dp] = (byte)n; dp++;
dest[dp] = theByte; dp++;
sp += n;
size += 2;
}
}
/* store the end of line or end of bitmap codes */
dest[dp] = 0; dp++;
if (last) {
dest[dp] = 1; dp++;
} else {
dest[dp] = 0; dp++;
}
size += 2;
return size;
}
void convertPixelsToBGR(ImageData image, byte[] dest) {
/*
* For direct palette, uncompressed image, BMP encoders expect the
* pixels to be in BGR format for 24 & 32 bit and RGB 1555 for 16 bit
* On Linux and MacOS, the pixels are in RGB format. Also, in
* MacOS, the alpha byte may be first.
* Hence, we use the palette information of the image and convert
* the pixels to the required format. Converted pixels are stored
* in dest byte array.
*/
byte[] data = image.data;
PaletteData palette = image.palette;
for (int y = 0; y < image.height; y++) {
int index;
int srcX = 0, srcY = y;
int numOfBytes = image.depth / 8;
index = (y * image.bytesPerLine);
for (int i = 0; i < image.width; i++) {
int pixel = 0;
switch (image.depth) {
case 32:
pixel = ((data[index] & 0xFF) << 24)
| ((data[index + 1] & 0xFF) << 16)
| ((data[index + 2] & 0xFF) << 8)
| (data[index + 3] & 0xFF);
break;
case 24:
pixel = ((data[index] & 0xFF) << 16)
| ((data[index + 1] & 0xFF) << 8)
| (data[index + 2] & 0xFF);
break;
case 16:
pixel = ((data[index + 1] & 0xFF) << 8)
| (data[index] & 0xFF);
break;
default:
SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
}
if (image.depth == 16) {
/* convert to RGB 555 format */
int r = pixel & palette.redMask;
r = ((palette.redShift < 0) ? r >>> -palette.redShift
: r << palette.redShift);
int g = pixel & palette.greenMask;
g = ((palette.greenShift < 0) ? g >>> -palette.greenShift
: g << palette.greenShift);
g = (g & 0xF8); /* In 565 format, G is 6 bit, mask it to 5 bit */
int b = pixel & palette.blueMask;
b = ((palette.blueShift < 0) ? b >>> -palette.blueShift
: b << palette.blueShift);
int modPixel = (r << 7) | (g << 2) | (b >> 3);
dest[index] = (byte) (modPixel & 0xFF);
dest[index + 1] = (byte) ((modPixel >> 8) & 0xFF);
} else {
/* convert to BGR format */
int b = pixel & palette.blueMask;
dest[index] = (byte) ((palette.blueShift < 0) ? b >>> -palette.blueShift
: b << palette.blueShift);
int g = pixel & palette.greenMask;
dest[index + 1] = (byte) ((palette.greenShift < 0) ? g >>> -palette.greenShift
: g << palette.greenShift);
int r = pixel & palette.redMask;
dest[index + 2] = (byte) ((palette.redShift < 0) ? r >>> -palette.redShift
: r << palette.redShift);
if (numOfBytes == 4) dest[index + 3] = 0;
}
srcX++;
if (srcX >= image.width) {
srcY++;
index = srcY * image.bytesPerLine;
srcX = 0;
} else {
index += numOfBytes;
}
}
}
}
void decompressData(byte[] src, byte[] dest, int stride, int cmp) {
if (cmp == 1) { // BMP_RLE8_COMPRESSION
if (decompressRLE8Data(src, src.length, stride, dest, dest.length) <= 0)
SWT.error(SWT.ERROR_INVALID_IMAGE);
return;
}
if (cmp == 2) { // BMP_RLE4_COMPRESSION
if (decompressRLE4Data(src, src.length, stride, dest, dest.length) <= 0)
SWT.error(SWT.ERROR_INVALID_IMAGE);
return;
}
SWT.error(SWT.ERROR_INVALID_IMAGE);
}
int decompressRLE4Data(byte[] src, int numBytes, int stride, byte[] dest, int destSize) {
int sp = 0;
int se = numBytes;
int dp = 0;
int de = destSize;
int x = 0, y = 0;
while (sp < se) {
int len = src[sp] & 0xFF;
sp++;
if (len == 0) {
len = src[sp] & 0xFF;
sp++;
switch (len) {
case 0: /* end of line */
y++;
x = 0;
dp = y * stride;
if (dp > de)
return -1;
break;
case 1: /* end of bitmap */
return 1;
case 2: /* delta */
x += src[sp] & 0xFF;
sp++;
y += src[sp] & 0xFF;
sp++;
dp = y * stride + x / 2;
if (dp > de)
return -1;
break;
default: /* absolute mode run */
if ((len & 1) != 0) /* odd run lengths not currently supported */
return -1;
x += len;
len = len / 2;
if (len > (se - sp))
return -1;
if (len > (de - dp))
return -1;
for (int i = 0; i < len; i++) {
dest[dp] = src[sp];
dp++;
sp++;
}
if ((sp & 1) != 0)
sp++; /* word align sp? */
break;
}
} else {
if ((len & 1) != 0)
return -1;
x += len;
len = len / 2;
byte theByte = src[sp];
sp++;
if (len > (de - dp))
return -1;
for (int i = 0; i < len; i++) {
dest[dp] = theByte;
dp++;
}
}
}
return 1;
}
int decompressRLE8Data(byte[] src, int numBytes, int stride, byte[] dest, int destSize) {
int sp = 0;
int se = numBytes;
int dp = 0;
int de = destSize;
int x = 0, y = 0;
while (sp < se) {
int len = src[sp] & 0xFF;
sp++;
if (len == 0) {
len = src[sp] & 0xFF;
sp++;
switch (len) {
case 0: /* end of line */
y++;
x = 0;
dp = y * stride;
if (dp > de)
return -1;
break;
case 1: /* end of bitmap */
return 1;
case 2: /* delta */
x += src[sp] & 0xFF;
sp++;
y += src[sp] & 0xFF;
sp++;
dp = y * stride + x;
if (dp > de)
return -1;
break;
default: /* absolute mode run */
if (len > (se - sp))
return -1;
if (len > (de - dp))
return -1;
for (int i = 0; i < len; i++) {
dest[dp] = src[sp];
dp++;
sp++;
}
if ((sp & 1) != 0)
sp++; /* word align sp? */
x += len;
break;
}
} else {
byte theByte = src[sp];
sp++;
if (len > (de - dp))
return -1;
for (int i = 0; i < len; i++) {
dest[dp] = theByte;
dp++;
}
x += len;
}
}
return 1;
}
@Override
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;
}
}
boolean isPaletteBMP(PaletteData pal, int depth) {
switch(depth) {
case 32:
if ((pal.redMask == 0xFF00) && (pal.greenMask == 0xFF0000) && (pal.blueMask == 0xFF000000)) return true;
return false;
case 24:
if ((pal.redMask == 0xFF) && (pal.greenMask == 0xFF00) && (pal.blueMask == 0xFF0000)) return true;
return false;
case 16:
if ((pal.redMask == 0x7C00) && (pal.greenMask == 0x3E0) && (pal.blueMask == 0x1F)) return true;
return false;
default:
return true;
}
}
byte[] loadData(byte[] infoHeader) {
int width = (infoHeader[4] & 0xFF) | ((infoHeader[5] & 0xFF) << 8) | ((infoHeader[6] & 0xFF) << 16) | ((infoHeader[7] & 0xFF) << 24);
int height = (infoHeader[8] & 0xFF) | ((infoHeader[9] & 0xFF) << 8) | ((infoHeader[10] & 0xFF) << 16) | ((infoHeader[11] & 0xFF) << 24);
int bitCount = (infoHeader[14] & 0xFF) | ((infoHeader[15] & 0xFF) << 8);
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 height = (infoHeader[8] & 0xFF) | ((infoHeader[9] & 0xFF) << 8) | ((infoHeader[10] & 0xFF) << 16) | ((infoHeader[11] & 0xFF) << 24);
if (height < 0) height = -height;
int dataSize = height * stride;
byte[] data = new byte[dataSize];
int cmp = (infoHeader[16] & 0xFF) | ((infoHeader[17] & 0xFF) << 8) | ((infoHeader[18] & 0xFF) << 16) | ((infoHeader[19] & 0xFF) << 24);
if (cmp == 0 || cmp == 3) { // BMP_NO_COMPRESSION
try {
if (inputStream.read(data) != dataSize)
SWT.error(SWT.ERROR_INVALID_IMAGE);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
} else {
int compressedSize = (infoHeader[20] & 0xFF) | ((infoHeader[21] & 0xFF) << 8) | ((infoHeader[22] & 0xFF) << 16) | ((infoHeader[23] & 0xFF) << 24);
byte[] compressed = new byte[compressedSize];
try {
if (inputStream.read(compressed) != compressedSize)
SWT.error(SWT.ERROR_INVALID_IMAGE);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
decompressData(compressed, data, stride, cmp);
}
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;
}
@Override
ImageData[] loadFromByteStream() {
int[] fileHeader = loadFileHeader();
byte[] infoHeader = new byte[BMPHeaderFixedSize];
try {
inputStream.read(infoHeader);
} catch (Exception e) {
SWT.error(SWT.ERROR_IO, e);
}
int width = (infoHeader[4] & 0xFF) | ((infoHeader[5] & 0xFF) << 8) | ((infoHeader[6] & 0xFF) << 16) | ((infoHeader[7] & 0xFF) << 24);
int height = (infoHeader[8] & 0xFF) | ((infoHeader[9] & 0xFF) << 8) | ((infoHeader[10] & 0xFF) << 16) | ((infoHeader[11] & 0xFF) << 24);
if (height < 0) height = -height;
int bitCount = (infoHeader[14] & 0xFF) | ((infoHeader[15] & 0xFF) << 8);
this.compression = (infoHeader[16] & 0xFF) | ((infoHeader[17] & 0xFF) << 8) | ((infoHeader[18] & 0xFF) << 16) | ((infoHeader[19] & 0xFF) << 24);
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);
this.importantColors = (infoHeader[36] & 0xFF) | ((infoHeader[37] & 0xFF) << 8) | ((infoHeader[38] & 0xFF) << 16) | ((infoHeader[39] & 0xFF) << 24);
int xPelsPerMeter = (infoHeader[24] & 0xFF) | ((infoHeader[25] & 0xFF) << 8) | ((infoHeader[26] & 0xFF) << 16) | ((infoHeader[27] & 0xFF) << 24);
int yPelsPerMeter = (infoHeader[28] & 0xFF) | ((infoHeader[29] & 0xFF) << 8) | ((infoHeader[30] & 0xFF) << 16) | ((infoHeader[31] & 0xFF) << 24);
this.pelsPerMeter = new Point(xPelsPerMeter, yPelsPerMeter);
int type = (this.compression == 1 /*BMP_RLE8_COMPRESSION*/) || (this.compression == 2 /*BMP_RLE4_COMPRESSION*/) ? SWT.IMAGE_BMP_RLE : SWT.IMAGE_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) {
int depth = (infoHeader[14] & 0xFF) | ((infoHeader[15] & 0xFF) << 8);
if (depth <= 8) {
int numColors = (infoHeader[32] & 0xFF) | ((infoHeader[33] & 0xFF) << 8) | ((infoHeader[34] & 0xFF) << 16) | ((infoHeader[35] & 0xFF) << 24);
if (numColors == 0) {
numColors = 1 << depth;
} else {
if (numColors > 256)
numColors = 256;
}
byte[] buf = new byte[numColors * 4];
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 (depth == 16) {
if (this.compression == 3) {
try {
return new PaletteData(inputStream.readInt(), inputStream.readInt(), inputStream.readInt());
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
}
return new PaletteData(0x7C00, 0x3E0, 0x1F);
}
if (depth == 24) return new PaletteData(0xFF, 0xFF00, 0xFF0000);
if (this.compression == 3) {
try {
return new PaletteData(inputStream.readInt(), inputStream.readInt(), inputStream.readInt());
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
}
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 += 4;
}
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 * 4];
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 += 4;
}
return bytes;
}
/**
* Unload the given image's data into the given byte stream
* using the given compression strategy.
* Answer the number of bytes written.
* Method modified to use the passed data if it is not null.
*/
int unloadData(ImageData image, byte[] data, OutputStream out, int comp) {
int totalSize = 0;
try {
if (comp == 0)
return unloadDataNoCompression(image, data, out);
int bpl = (image.width * image.depth + 7) / 8;
int bmpBpl = (bpl + 3) / 4 * 4; // BMP pads scanlines to multiples of 4 bytes
int imageBpl = image.bytesPerLine;
// Compression can actually take twice as much space, in worst case
byte[] buf = new byte[bmpBpl * 2];
int srcOffset = imageBpl * (image.height - 1); // Start at last line
if (data == null) data = image.data;
totalSize = 0;
byte[] buf2 = new byte[32768];
int buf2Offset = 0;
for (int y = image.height - 1; y >= 0; y--) {
int lineSize = compress(comp, data, srcOffset, bpl, buf, y == 0);
if (buf2Offset + lineSize > buf2.length) {
out.write(buf2, 0, buf2Offset);
buf2Offset = 0;
}
System.arraycopy(buf, 0, buf2, buf2Offset, lineSize);
buf2Offset += lineSize;
totalSize += lineSize;
srcOffset -= imageBpl;
}
if (buf2Offset > 0)
out.write(buf2, 0, buf2Offset);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
return totalSize;
}
/**
* Prepare the given image's data for unloading into a byte stream
* using no compression strategy.
* Answer the number of bytes written.
* Method modified to use the passed data if it is not null.
*/
int unloadDataNoCompression(ImageData image, byte[] data, 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];
if (data == null) 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.
*/
@Override
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);
int comp = this.compression;
if (!((comp == 0) || ((comp == 1) && (image.depth == 8)) ||
((comp == 2) && (image.depth == 4))))
SWT.error(SWT.ERROR_INVALID_IMAGE);
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;
}
byte iData[] = null;
// If the pixels are not in the expected BMP format, convert them.
if (pal.isDirect && !isPaletteBMP(pal, image.depth)) {
// array to store the converted pixels
iData = new byte[image.data.length];
convertPixelsToBGR(image, iData);
}
// 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, iData, out, comp);
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.writeInt(image.width);
outputStream.writeInt(image.height);
outputStream.writeShort(1);
outputStream.writeShort((short)image.depth);
outputStream.writeInt(comp);
outputStream.writeInt(data.length);
outputStream.writeInt(pelsPerMeter.x);
outputStream.writeInt(pelsPerMeter.y);
outputStream.writeInt(numCols);
outputStream.writeInt(importantColors);
} 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;
}
}
}
