125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
/* frame.cpp
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* Takes a black/white (1bpp) PNM ASCII-armored image as input,
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* and produces the frame.S assembly code to draw it
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* as an analog video signal for this project's kernel.
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* */
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#include <iostream>
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#include <fstream>
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enum ExitStatus {
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BAD_ARGUMENT = 1,
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FILE_NOT_OPEN = 2,
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FILE_BAD_FORMAT = 3
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};
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int main(int argc, char** argv) {
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if (argc != 2) {
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return BAD_ARGUMENT;
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}
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std::fstream infile;
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infile.open(argv[1], std::ios::in);
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if (! infile) {
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return FILE_NOT_OPEN;
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}
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std::fstream outfile;
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outfile.open("frame.S", std::ios::out);
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if (! outfile) {
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return FILE_NOT_OPEN;
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}
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outfile << "#include \"macro.h\"" << std::endl;
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outfile << "#include <avr/io.h>" << std::endl;
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outfile << ".global line_jump_table" << std::endl;
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outfile << "line_jump_table:" << std::endl;
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for (int i = 0; i < 256; ++i) {
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outfile << '\t' << "jmp line_" << i << std::endl;
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}
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int width, height;
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std::string format;
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char c;
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getline(infile, format);
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std::cout << format << std::endl;
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if (format != "P1") {
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return FILE_BAD_FORMAT;
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}
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// skip one line TODO
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getline(infile, format);
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std::cout << format << std::endl;
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infile >> width >> height;
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std::cout << width << " x " << height << std::endl;
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char* image = new char[height * width];
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for (int y = 0; y < height; ) {
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for (int x = 0; x < width; ) {
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c = infile.get();
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if (! infile.good())
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return FILE_BAD_FORMAT;
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if (c == '0' || c == '1') {
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image[y * width + x] = c;
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x++;
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} else {
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continue;
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}
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}
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y++;
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}
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infile.close();
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for (int y = 0; y < height; ++y) {
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outfile << "line_" << y << ":" << std::endl;
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int count = 0;
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char last = image[y * width + 0];
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for (int x = 0; x < width; ++x) {
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char current = image[y * width + x];
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std::cout << "current " << current << " last " << last << std::endl;
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if (current == last) {
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++count;
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} else {
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std::cout << "detected change" << std::endl;
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if (last == '0') {
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std::cout << "clear" << std::endl;
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outfile << '\t' << "cbi IO(PORTB), 4" << std::endl;
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} else if (last == '1') {
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std::cout << "set" << std::endl;
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outfile << '\t' << "sbi IO(PORTB), 4" << std::endl;
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}
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if (count > 1) {
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outfile << '\t' << "ldi r31, " << count - 1 << std::endl;
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outfile << "1:" << std::endl;
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outfile << '\t' << "dec r31" << std::endl;
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outfile << '\t' << "nop" << std::endl;
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outfile << '\t' << "brne 1b" << std::endl;
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}
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outfile << '\t' << "rjmp 2f" << std::endl;
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outfile << "2:" << std::endl;
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last = current;
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count = 1;
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}
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}
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outfile << '\t' << "cbi IO(PORTB), 4" << std::endl;
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outfile << '\t' << "jmp jump_table_return_address" << std::endl;
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}
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outfile.close();
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}
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