brooke/dither4
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Brooke Vibber 2022-11-25 17:54:58 -08:00
parent da3a6d69c6
commit da00cf317f
2 changed files with 29 additions and 27 deletions
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25
Makefile
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@ -1,22 +1,27 @@
.PHONY : all clean
all : dither4.xex
all : sample0.xex sample1.xex sample2.xex sample3.xex sample4.xex sample5.xex sample6.xex
# sample5.s from sample5.jpg
# reminder: $< is input
# $@ is output
%.o : %.s
ca65 -v -t atari -o $@ $<
%.s : %.jpg
node dither-image.js $< $@ $@.png
%.o : %.s
ca65 -v -t atari -o $@ $<
%.xex : %.o dither4.o
ld65 -v -C atari-asm-xex.cfg -o $@ $<
dither4.xex : dither4.o sample6.o
ld65 -v -C atari-asm-xex.cfg -o $@ $<
clean :
rm -f sample5.s
rm -f sample5.o
rm -f dither4.o
rm -f dither4.xex
#clean :
# rm -f dither4.o
# rm -f dither4.xex
# rm -f sample[0-6].o
# rm -f sample[0-6].s
# rm -f sample[0-6].xex
# rm -f sample[0-6].png

23
dither-image.js
View file

@ -626,10 +626,8 @@ async function convert(source, nbits) {
for (let y = 0; y < height; y++) {
let error = lines[y - 1]?.error;
let inputLine = input.slice(y * width, (y + 1) * width);
console.log(`DOING LINE ${y}; have ${inputLine.length} pixels`);
let line = decimate(inputLine, allColors, 4, error);
lines.push(line);
console.log(`DID LINE ${y}; have ${line.output.length} pixels`);
}
return {
width,
@ -640,12 +638,13 @@ async function convert(source, nbits) {
function indexedToBitmap(width, nbits, src, dest) {
let nbytes = width >> nbits;
let nbytes = width * nbits / 8;
let x = 0;
for (let i = 0; i < nbytes; i++) {
let a = 0;
for (let b = 0; b < 8; b += nbits) {
a <<= nbits;
a |= src[i];
a |= src[x++];
}
dest[i] = a;
}
@ -654,7 +653,7 @@ function indexedToBitmap(width, nbits, src, dest) {
function byte2byte(arr) {
let lines = [];
for (let i=0; i < arr.length; i++) {
lines.push(`.byte ${lines[i]}`);
lines.push(`.byte ${arr[i]}`);
}
return lines.join('\n');
}
@ -669,24 +668,22 @@ function genAssembly(width, height, nbits, lines) {
palette1[y] = lines[y].palette[1];
palette2[y] = lines[y].palette[2];
palette3[y] = lines[y].palette[3];
indexedToBitmap(width, nbits, lines[y].output, framebuffer.slice(y * stride));
indexedToBitmap(width, nbits, lines[y].output, framebuffer.slice(y * stride, (y + 1) * stride));
}
return `
.data
return `.data
.export palette1:
.export far palette1:
${byte2byte(palette1)}
.export palette2:
.export far palette2:
${byte2byte(palette2)}
.export palette3:
.export far palette3:
${byte2byte(palette3)}
.export framebuffer:
.export far framebuffer:
${byte2byte(framebuffer)}
`;
}