75 lines
2.1 KiB
Java
75 lines
2.1 KiB
Java
package a2geek.apple2.image.encoder.encode;
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import a2geek.apple2.image.encoder.A2Image;
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/**
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* Perform bit pack #2.
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* <p>
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* Image is encoded as such:<br/>
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* 1nnn nnnn = plot current color n pixels (1..128)<br/>
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* 01nn cccc = set color, plot n pixels (n = 0 to 3; 0 = setcolor)<br/>
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* 0000 0000 = end<br/>
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* 001n nnnn = move down n (1..32) lines (reset X to 0, line CR)<br/>
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* 0001 ???? = undef<br/>
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*
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* @author a2geek@users.noreply.github.com (sort of)
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*/
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public class BitPack2 extends A2Encoder {
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public String getTitle() {
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return "Bit Pack #2";
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}
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public void encode(A2Image a2image, int maxSize) {
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int currentColor = 0;
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// FIXME: Should implement this as endOfLine...
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int solidBlackLines = 0;
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reset(maxSize);
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for (int i=0; i<a2image.getTotalPixels(); i++) {
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int color = a2image.getColor(i);
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boolean solidBlackLine = false;
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if (color == 0 && i % a2image.getWidth() == 0) {
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int blackPixels = 0;
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for (int j=0; j<a2image.getWidth(); j++) {
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if (a2image.getColor(i+j) == 0) blackPixels++;
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}
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solidBlackLine = (blackPixels == a2image.getWidth());
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}
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if (solidBlackLine) {
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solidBlackLines++;
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i+= a2image.getWidth() - 1; // for loop increments by 1 too
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} else {
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if (solidBlackLines > 0) {
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if (solidBlackLines > 32) {
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addByte(0x20 + 31);
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solidBlackLines-= 32;
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} else {
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addByte(0x20 + solidBlackLines-1);
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solidBlackLines = 0;
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}
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i--; // we need to remain at the current position
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} else if (color == currentColor) {
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int number = 1;
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while (number <= 128 && a2image.getColor(i+1) == currentColor) {
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i++;
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number++;
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}
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addByte(0x80 + number-1);
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} else { // color != currentColor
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int number = 1;
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while (number < 3 && a2image.getColor(i+1) == color) {
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i++;
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number++;
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}
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addByte(0x40 + (number << 4) + color);
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currentColor = color;
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}
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}
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}
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if (solidBlackLines > 0) {
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addByte(0x20 + solidBlackLines);
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solidBlackLines = 0;
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}
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addByte(0x00);
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}
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}
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