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#106 Only emit used colors

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This commit is contained in:
Autumn Lamonte 2022-02-04 14:57:17 -06:00
parent c645e8a5a0
commit 6412d28141
1 changed files with 11 additions and 0 deletions
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11
src/jexer/backend/HQSixelEncoder.java
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@ -627,6 +627,11 @@ public class HQSixelEncoder implements SixelEncoder {
*/
private List<Integer> sixelColors = null;
/**
* The colors actually used in the image.
*/
private BitSet usedColors = null;
/**
* Color palette for sixel output, sorted low to high by the first
* principal component.
@ -757,6 +762,7 @@ public class HQSixelEncoder implements SixelEncoder {
numColors = Math.min(paletteSize, FAST_AND_DIRTY);
}
sixelColors = new ArrayList<Integer>(numColors);
usedColors = new BitSet(numColors);
sixelRows = new SixelRow[(image.getHeight() / 6) + 1];
for (int i = 0; i < sixelRows.length; i++) {
sixelRows[i] = new SixelRow();
@ -1076,6 +1082,7 @@ public class HQSixelEncoder implements SixelEncoder {
// don't _need_ an ordering, but it does make it nicer to look at
// the generated output and understand what's going on.
sixelColors = new ArrayList<Integer>(colorMap.size());
usedColors = new BitSet(colorMap.size());
for (ColorIdx color: colorMap.values()) {
sixelColors.add(color.color);
}
@ -1588,6 +1595,7 @@ public class HQSixelEncoder implements SixelEncoder {
int newPixel = sixelColors.get(colorIdx);
rgbArray[imageX + (width * imageY)] = colorIdx;
sixelRow.colors.set(colorIdx);
usedColors.set(colorIdx);
if (quantizationType == 0) {
// For direct map, every possible color is already in
@ -1705,6 +1713,9 @@ public class HQSixelEncoder implements SixelEncoder {
*/
public void emitPalette(final StringBuilder sb) {
for (int i = 0; i < sixelColors.size(); i++) {
if (!usedColors.get(i)) {
continue;
}
int sixelColor = sixelColors.get(i);
int red = ((sixelColor >>> 16) & 0xFF);
int green = ((sixelColor >>> 8) & 0xFF);