public void write(File out, boolean allowOverwrite) throws IOException {
final ImageInfo imi =
new ImageInfo(
pixelWidth,
pixelHeight,
8,
(4 == bytesPerPixel) ? true : false); // 8 bits per channel, no alpha
// open image for writing to a output stream
final OutputStream outs =
new BufferedOutputStream(IOUtil.getFileOutputStream(out, allowOverwrite));
try {
final PngWriter png = new PngWriter(outs, imi);
// add some optional metadata (chunks)
png.getMetadata().setDpi(dpi[0], dpi[1]);
png.getMetadata().setTimeNow(0); // 0 seconds fron now = now
png.getMetadata().setText(PngChunkTextVar.KEY_Title, "JogAmp PNGImage");
// png.getMetadata().setText("my key", "my text");
final boolean hasAlpha = 4 == bytesPerPixel;
final ImageLine l1 = new ImageLine(imi);
if (isGLOriented) {
// start at last pixel at end-of-buffer, reverse read (OpenGL bottom-left -> PNG top-left
// origin)
int dataOff =
(pixelWidth * bytesPerPixel * (pixelHeight - 1))
+ // full lines - 1 line
((pixelWidth - 1) * bytesPerPixel); // one line - 1 pixel
for (int row = 0; row < pixelHeight; row++) {
int lineOff =
(pixelWidth - 1)
* bytesPerPixel; // start w/ last pixel in line, reverse store (OpenGL bottom-left
// -> PNG top-left origin)
if (1 == bytesPerPixel) {
for (int j = pixelWidth - 1; j >= 0; j--) {
l1.scanline[lineOff--] = data.get(dataOff--); // // Luminance, 1 bytesPerPixel
}
} else {
for (int j = pixelWidth - 1; j >= 0; j--) {
dataOff = setPixelRGBA8(l1, lineOff, data, dataOff, hasAlpha);
lineOff -= bytesPerPixel;
}
}
png.writeRow(l1, row);
}
} else {
int dataOff =
0; // start at first pixel at start-of-buffer, normal read (same origin: top-left)
for (int row = 0; row < pixelHeight; row++) {
int lineOff = 0; // start w/ first pixel in line, normal store (same origin: top-left)
if (1 == bytesPerPixel) {
for (int j = pixelWidth - 1; j >= 0; j--) {
l1.scanline[lineOff++] = data.get(dataOff++); // // Luminance, 1 bytesPerPixel
}
} else {
for (int j = pixelWidth - 1; j >= 0; j--) {
dataOff = setPixelRGBA8(l1, lineOff, data, dataOff, hasAlpha);
lineOff += bytesPerPixel;
}
}
png.writeRow(l1, row);
}
}
png.end();
} finally {
IOUtil.close(outs, false);
}
}
