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Use the first color index to determine foreground transparency

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kuroppoi
2023-07-10 16:57:39 +02:00
parent a479c158db
commit 4f8a717ffb
1 changed files with 9 additions and 17 deletions
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26
src/main/java/entralinked/utility/TiledImageReader.java
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@@ -70,14 +70,13 @@ public class TiledImageReader {
* @param normalizedIndices Indicates that tile indices are not linear (Black & White C-Gear skins) and should be normalized.
* @return A {@link BufferedImage} representing the read image data.
*/
public static BufferedImage readTiledImage(InputStream inputStream,
int tileCount, int backgroundColorCount, byte[] backgroundColorIndices, boolean normalizeIndices) throws IOException {
public static BufferedImage readTiledImage(InputStream inputStream, int tileCount, int backgroundColorCount,
byte[] backgroundColorIndices, boolean normalizeIndices) throws IOException {
BufferedImage image = new BufferedImage(SCREEN_WIDTH, SCREEN_HEIGHT, BufferedImage.TYPE_INT_RGB); // Result image
int[] tileData = new int[tileCount * TILE_SIZE];
int[] tileIndices = new int[tileCount]; // Tile index lookup table
int[] colorPalette = new int[COLOR_PALETTE_SIZE];
int[] backgroundColorPalette = new int[backgroundColorCount];
boolean[] transparencyMarkers = new boolean[COLOR_PALETTE_SIZE]; // Keeps track of which colors should become background colors
// Read tile data.
for(int i = 0; i < tileCount; i++) {
@@ -94,18 +93,10 @@ public class TiledImageReader {
}
// Read foreground color data.
// In cases where background colors are present, pixels that use the *first* foreground color
// will be replaced by the background color at that pixel's location.
for(int i = 0; i < COLOR_PALETTE_SIZE; i++) {
int leftBits = inputStream.read();
int rightBits = inputStream.read();
// So far, the least significant bits of colors that are replaced by background colors are always 0x2A.
// TODO Needs more thorough testing -- is this check reliable? What do the most significant bits signify here?
if(backgroundColorIndices != null && rightBits == 0x2A) {
transparencyMarkers[i] = true;
continue;
}
colorPalette[i] = convertColor(leftBits | rightBits << 8);
colorPalette[i] = convertColor(inputStream.read() | inputStream.read() << 8);
}
// Read background color data.
@@ -153,8 +144,9 @@ public class TiledImageReader {
int pixelY = y + j / TILE_WIDTH;
int paletteIndex = tileData[tileIndex * TILE_SIZE + tilePixelIndex];
// If this color has been marked as a 'transparent' color, use the color from the background instead.
int color = !transparencyMarkers[paletteIndex] ? colorPalette[paletteIndex]
// If a background is present and the foreground color index of this pixel is 0, use the background color instead.
// The background color index is determined by the pixel location.
int color = backgroundColorIndices == null || paletteIndex > 0 ? colorPalette[paletteIndex]
: backgroundColorPalette[backgroundColorIndices[pixelY * SCREEN_WIDTH + pixelX]];
// Finally, set the pixel!
@@ -171,7 +163,7 @@ public class TiledImageReader {
int pixelX = x + j % TILE_WIDTH;
int pixelY = y + j / TILE_WIDTH;
int paletteIndex = tileData[i * TILE_SIZE + j];
int color = !transparencyMarkers[paletteIndex] ? colorPalette[paletteIndex]
int color = backgroundColorIndices == null || paletteIndex > 0 ? colorPalette[paletteIndex]
: backgroundColorPalette[backgroundColorIndices[pixelY * SCREEN_WIDTH + pixelX]];
image.setRGB(pixelX, pixelY, color);
}