Alex/KittyBot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

+ Added alpha implementation for overlay images

Browse Source
This commit is contained in:
Matthew Cech
2019-04-14 23:58:47 -07:00
parent fb1f6b48ba
commit 75d0d701ab
1 changed files with 16 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/utils/ImageOverlayBuilder.java
+16 -2
View File
@@ -5,9 +5,9 @@ import java.awt.image.DataBufferByte;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Calendar;
import java.util.Iterator;
import javax.imageio.IIOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
@@ -169,6 +169,7 @@ public class ImageOverlayBuilder
final int y = ((i / PIXEL_BYTE_LENGTH) / baseWidth);
// If we're within the bounds of where the overlay picture should go...
// ...then get bytes and manually apply alpha overlay.
if(x > left && x < right && y > top && y < bottom)
{
final int overlayX = x - left;
@@ -178,8 +179,21 @@ public class ImageOverlayBuilder
if(overlayX < 0 || overlayY < 0 || overlayX >= baseWidth || overlayY >= baseHeight)
continue;
byte[] overlayBytes = ByteBuffer.allocate(4).putInt(imageOverlay.getRGB(overlayX, overlayY)).array();
byte[] baseBytes = ByteBuffer.allocate(4).putInt(imageBase.getRGB(x, y)).array();
float overlayT = (overlayBytes[0] & 0xFF) / 255.0f;
// Java has a restriction where we can't actually manupulate unsigned bytes apparently(?) so
// what this does is convert the specific bytes to ints in order to manipuate them, then takes the
// byte buffer and parses the far right byte out of the int after manipulating the value.
byte[] output = new byte[4];
output[0] = (byte)0b11111111;
output[1] = ByteBuffer.allocate(4).putInt((int) ((baseBytes[1] & 0xFF) - (overlayT * ((baseBytes[1] & 0xFF) - (overlayBytes[1] & 0xFF))))).array()[3];
output[2] = ByteBuffer.allocate(4).putInt((int) ((baseBytes[2] & 0xFF) - (overlayT * ((baseBytes[2] & 0xFF) - (overlayBytes[2] & 0xFF))))).array()[3];
output[3] = ByteBuffer.allocate(4).putInt((int) ((baseBytes[3] & 0xFF) - (overlayT * ((baseBytes[3] & 0xFF) - (overlayBytes[3] & 0xFF))))).array()[3];
// Re-write bytes as overlay
imageBase.setRGB(x, y, imageOverlay.getRGB(overlayX, overlayY));
imageBase.setRGB(x, y, ByteBuffer.wrap(output).getInt());
}
}