@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)
};
}
/**
* Return a DeviceIndependentImage representing the image block at the current position in the
* input stream. Throw an error if an error occurs.
*/
ImageData readImageBlock(PaletteData defaultPalette) {
int depth;
PaletteData palette;
byte[] block = new byte[9];
try {
inputStream.read(block);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
int left = (block[0] & 0xFF) | ((block[1] & 0xFF) << 8);
int top = (block[2] & 0xFF) | ((block[3] & 0xFF) << 8);
int width = (block[4] & 0xFF) | ((block[5] & 0xFF) << 8);
int height = (block[6] & 0xFF) | ((block[7] & 0xFF) << 8);
byte bitField = block[8];
boolean interlaced = (bitField & 0x40) != 0;
// boolean sorted = (bitField & 0x20) != 0;
if ((bitField & 0x80) != 0) {
// Local palette.
depth = (bitField & 0x7) + 1;
palette = readPalette(1 << depth);
} else {
// No local palette.
depth = defaultDepth;
palette = defaultPalette;
}
/* Work around: Ignore the case where a GIF specifies an
* invalid index for the transparent pixel that is larger
* than the number of entries in the palette. */
if (transparentPixel > 1 << depth) {
transparentPixel = -1;
}
// Promote depth to next highest supported value.
if (!(depth == 1 || depth == 4 || depth == 8)) {
if (depth < 4) depth = 4;
else depth = 8;
}
if (palette == null) {
palette = grayRamp(1 << depth);
}
int initialCodeSize = -1;
try {
initialCodeSize = inputStream.read();
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
if (initialCodeSize < 0) {
SWT.error(SWT.ERROR_INVALID_IMAGE);
}
ImageData image =
ImageData.internal_new(
width,
height,
depth,
palette,
4,
null,
0,
null,
null,
-1,
transparentPixel,
SWT.IMAGE_GIF,
left,
top,
disposalMethod,
delayTime);
LZWCodec codec = new LZWCodec();
codec.decode(inputStream, loader, image, interlaced, initialCodeSize);
return image;
}