/**
* Create pixels for the tile
*
* @param attributes attributes of the tile variant
* @param isSprite true if we want to retrieve sprite pixels, fals for normal tiles
* @return rgb data
*/
private int[] createPixels(final int attributes, final boolean isSprite) {
// check whether we can use cached data
final ColorPalette palette =
this.video
.getColorPalettes()[
(attributes & 0x07)
+ (isSprite ? VideoChip.PALETTE_SPRITES : VideoChip.PALETTE_BACKGROUND)];
int[] result = null;
Integer hc = null;
if (useCache) {
hc = new Integer(palette.hashCode() ^ tileData.hashCode() ^ attributes);
result = (int[]) tileCache.get(hc);
}
if (result == null) {
// we cache some variables locally for better performance
final int height_ = getHeight(), width_ = getWidth();
final byte[][] colorIdxs_ = tileData.getColorIndexes();
// create new empty RGB data space
final int[] rgbData_ = new int[height_ * width_];
// get the colors for all pixels
final boolean isFlipHorizontally = (attributes & (1 << 5)) != 0;
final boolean isFlipVertically = (attributes & (1 << 6)) != 0;
final int cyAdd = (isFlipVertically ? -1 : 1), cxAdd = isFlipHorizontally ? -1 : 1;
for (int y = 0, cy = isFlipVertically ? height_ - 1 : 0, yidx = 0;
y < height_;
++y, cy += cyAdd, yidx += width_) {
for (int x = 0, cx = isFlipHorizontally ? width_ - 1 : 0; x < width_; ++x, cx += cxAdd) {
final int colIdx = colorIdxs_[cy][cx];
if (isSprite && colIdx == 0) {
rgbData_[yidx + x] = TRANSPARENT;
} else {
rgbData_[yidx + x] = palette.getColor(colIdx);
}
}
}
result = scale(rgbData_);
// cache the result for later use
if (useCache) {
tileCache.put(hc, result);
}
}
// at least the requested variant is valid afterwards
this.areAllVariantsInvalid = false;
return result;
}
/** Clear the current contents of the tile cache */
public static void resetCache() {
if (null != tileCache) {
tileCache.clear();
}
}