Method setPixels

ij/src/main/java/ij/plugin/GIF_Reader.java:652–720

Creates new frame image from current data (and previous frames as specified by their disposition codes).

()

	 * frames as specified by their disposition codes).
	 */
	private void setPixels() {

		// expose destination image's pixels as int array
		int[] dest = (int[]) image.getPixels();

		// fill in starting image contents based on last image's dispose code (if any)
		if (lastDispose > 0) {
			if (lastDispose == 3) {	 // use image before last
				int n = frameCount - 2;
				if (n > 0)
					lastImage = getFrame(n-1);
				else
					lastImage = null;
			}

			if (lastImage != null) {
				int[] prev = (int[]) lastImage.getPixels();
				System.arraycopy(prev, 0, dest, 0, width*height);  // copy pixels

				if ((lastDispose == 2) && (lastBgColor != 0)) {
					// fill last image rect area with background color
					 image.setColor(new Color(lastBgColor));
					 image.setRoi(lastRect);
					image.fill();
				 }
			}
		}

		// copy each source line to the appropriate place in the destination
		int pass = 1;
		int inc = 8;
		int iline = 0;
		for (int i = 0; i < ih; i++) {
			int line = i;
			if (interlace) {
				if (iline >= ih) {
					pass++;
					switch (pass) {
						case 2:
							iline = 4;
							break;
						case 3:
							iline = 2;
							inc = 4;
							break;
						case 4:
							iline = 1;
							inc = 2;
					}
				}
				line = iline;
				iline += inc;
			}
			line += iy;
			if (line < height) {
				int k = line * width;
				int dx = k + ix;		   // start of line in dest
				int dlim = dx + iw;		   // end of dest line