152 lines
4.6 KiB
C++
152 lines
4.6 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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#include <sstream>
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#include <cstring>
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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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const int images = argc - 1;
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std::stringstream jump_table;
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std::stringstream asm_code;
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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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jump_table << "#include \"macro.h\"" << std::endl;
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jump_table << "#include <avr/io.h>" << std::endl;
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char** image = new char*[images];
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for (int current_image = 0; current_image < images; ++current_image) {
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std::fstream infile;
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infile.open(argv[1 + current_image], 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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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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image[current_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[current_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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jump_table << ".global line_jump_table_" << current_image << std::endl;
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jump_table << "line_jump_table_" << current_image << ":" << std::endl;
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for (int y = 0; y < height; ++y) {
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int diff = 1;
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for (int other_image = 0; other_image <= current_image; ++other_image) {
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for (int other_y = 0; other_y < height && other_y < y; ++other_y) {
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diff = memcmp(&(image[current_image][y * width + 0]), &(image[other_image][other_y * width + 0]), width);
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if (diff == 0) {
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jump_table << '\t' << "jmp line_" << other_image << "_" << other_y << std::endl;
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goto nested_loop_end;
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}
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}
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}
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nested_loop_end:
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if (diff == 0)
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continue;
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jump_table << '\t' << "jmp line_" << current_image << "_" << y << std::endl;
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asm_code << "line_" << current_image << "_" << y << ":" << std::endl;
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int count = 0;
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char last = image[current_image][y * width + 0];
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for (int x = 0; x < width; ++x) {
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char current = image[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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asm_code << '\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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asm_code << '\t' << "sbi IO(PORTB), 4" << std::endl;
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}
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if (count > 1) {
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asm_code << '\t' << "ldi r31, " << count - 1 << std::endl;
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asm_code << "1:" << std::endl;
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asm_code << '\t' << "dec r31" << std::endl;
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asm_code << '\t' << "nop" << std::endl;
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asm_code << '\t' << "brne 1b" << std::endl;
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}
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asm_code << '\t' << "rjmp 2f" << std::endl;
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asm_code << "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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asm_code << '\t' << "cbi IO(PORTB), 4" << std::endl;
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asm_code << '\t' << "jmp jump_table_return_address" << std::endl;
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}
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}
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delete[] image;
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outfile << jump_table.str() << asm_code.str();
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outfile.close();
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}
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