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255 lines
10 KiB
C++
255 lines
10 KiB
C++
//
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// Video.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#include "Video.hpp"
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using namespace Apple::II::Video;
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VideoBase::VideoBase(bool is_iie, std::function<void(Cycles)> &&target) :
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VideoSwitches<Cycles>(is_iie, Cycles(2), std::move(target)),
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crt_(910, 1, Outputs::Display::Type::NTSC60, Outputs::Display::InputDataType::Luminance1),
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is_iie_(is_iie) {
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crt_.set_display_type(Outputs::Display::DisplayType::CompositeColour);
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set_use_square_pixels(use_square_pixels_);
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// TODO: there seems to be some sort of bug whereby switching modes can cause
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// a signal discontinuity that knocks phase out of whack. So it isn't safe to
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// use default_colour_bursts elsewhere, though it otherwise should be. If/when
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// it is, start doing so and return to setting the immediate phase up here.
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// crt_.set_immediate_default_phase(0.5f);
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}
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void VideoBase::set_use_square_pixels(bool use_square_pixels) {
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use_square_pixels_ = use_square_pixels;
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// HYPER-UGLY HACK. See correlated hack in the Macintosh.
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#if defined(__APPLE__) && !defined(IGNORE_APPLE)
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crt_.set_visible_area(Outputs::Display::Rect(0.128f, 0.122f, 0.75f, 0.77f));
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#else
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if(use_square_pixels) {
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crt_.set_visible_area(Outputs::Display::Rect(0.128f, 0.09f, 0.75f, 0.77f));
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} else {
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crt_.set_visible_area(Outputs::Display::Rect(0.128f, 0.12f, 0.75f, 0.77f));
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}
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#endif
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if(use_square_pixels) {
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// From what I can make out, many contemporary Apple II monitors were
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// calibrated slightly to stretch the Apple II's display slightly wider
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// than it should be per the NTSC standards, for approximately square
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// pixels. This reproduces that.
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// 243 lines and 52µs are visible.
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// i.e. to be square, 1 pixel should be: (1/243 * 52) * (3/4) = 156/972 = 39/243 µs
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// On an Apple II each pixel is actually 1/7µs.
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// Therefore the adjusted aspect ratio should be (4/3) * (39/243)/(1/7) = (4/3) * 273/243 = 1092/729 = 343/243 ~= 1.412
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crt_.set_aspect_ratio(343.0f / 243.0f);
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} else {
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// Standard NTSC aspect ratio.
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crt_.set_aspect_ratio(4.0f / 3.0f);
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}
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}
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bool VideoBase::get_use_square_pixels() {
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return use_square_pixels_;
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}
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void VideoBase::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
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crt_.set_scan_target(scan_target);
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}
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Outputs::Display::ScanStatus VideoBase::get_scaled_scan_status() const {
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return crt_.get_scaled_scan_status() / 14.0f;
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}
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void VideoBase::set_display_type(Outputs::Display::DisplayType display_type) {
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crt_.set_display_type(display_type);
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}
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Outputs::Display::DisplayType VideoBase::get_display_type() const {
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return crt_.get_display_type();
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}
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void VideoBase::output_text(uint8_t *target, const uint8_t *const source, size_t length, size_t pixel_row) const {
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for(size_t c = 0; c < length; ++c) {
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const int character = source[c] & character_zones_[source[c] >> 6].address_mask;
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const uint8_t xor_mask = character_zones_[source[c] >> 6].xor_mask;
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const std::size_t character_address = size_t(character << 3) + pixel_row;
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const uint8_t character_pattern = character_rom_[character_address] ^ xor_mask;
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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target[0] = target[1] = character_pattern & 0x40;
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target[2] = target[3] = character_pattern & 0x20;
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target[4] = target[5] = character_pattern & 0x10;
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target[6] = target[7] = character_pattern & 0x08;
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target[8] = target[9] = character_pattern & 0x04;
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target[10] = target[11] = character_pattern & 0x02;
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target[12] = target[13] = character_pattern & 0x01;
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graphics_carry_ = character_pattern & 0x01;
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target += 14;
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}
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}
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void VideoBase::output_double_text(uint8_t *target, const uint8_t *const source, const uint8_t *const auxiliary_source, size_t length, size_t pixel_row) const {
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for(size_t c = 0; c < length; ++c) {
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const std::size_t character_addresses[2] = {
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size_t(
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(auxiliary_source[c] & character_zones_[auxiliary_source[c] >> 6].address_mask) << 3
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) + pixel_row,
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size_t(
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(source[c] & character_zones_[source[c] >> 6].address_mask) << 3
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) + pixel_row
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};
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const uint8_t character_patterns[2] = {
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uint8_t(
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character_rom_[character_addresses[0]] ^ character_zones_[auxiliary_source[c] >> 6].xor_mask
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),
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uint8_t(
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character_rom_[character_addresses[1]] ^ character_zones_[source[c] >> 6].xor_mask
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)
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};
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// The character ROM is output MSB to LSB rather than LSB to MSB.
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target[0] = character_patterns[0] & 0x40;
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target[1] = character_patterns[0] & 0x20;
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target[2] = character_patterns[0] & 0x10;
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target[3] = character_patterns[0] & 0x08;
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target[4] = character_patterns[0] & 0x04;
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target[5] = character_patterns[0] & 0x02;
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target[6] = character_patterns[0] & 0x01;
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target[7] = character_patterns[1] & 0x40;
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target[8] = character_patterns[1] & 0x20;
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target[9] = character_patterns[1] & 0x10;
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target[10] = character_patterns[1] & 0x08;
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target[11] = character_patterns[1] & 0x04;
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target[12] = character_patterns[1] & 0x02;
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target[13] = character_patterns[1] & 0x01;
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graphics_carry_ = character_patterns[1] & 0x01;
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target += 14;
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}
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}
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void VideoBase::output_low_resolution(uint8_t *target, const uint8_t *const source, size_t length, int column, int row) const {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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// Low-resolution graphics mode shifts the colour code on a loop, but has to account for whether this
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// 14-sample output window is starting at the beginning of a colour cycle or halfway through.
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if((column + int(c))&1) {
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target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 4;
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target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 8;
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target[2] = target[6] = target[10] = (source[c] >> row_shift) & 1;
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target[3] = target[7] = target[11] = (source[c] >> row_shift) & 2;
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graphics_carry_ = (source[c] >> row_shift) & 8;
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} else {
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target[0] = target[4] = target[8] = target[12] = (source[c] >> row_shift) & 1;
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target[1] = target[5] = target[9] = target[13] = (source[c] >> row_shift) & 2;
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target[2] = target[6] = target[10] = (source[c] >> row_shift) & 4;
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target[3] = target[7] = target[11] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 2;
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}
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target += 14;
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}
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}
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void VideoBase::output_fat_low_resolution(uint8_t *target, const uint8_t *const source, size_t length, int, int row) const {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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// Fat low-resolution mode appears not to do anything to try to make odd and
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// even columns compatible.
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target[0] = target[1] = target[8] = target[9] = (source[c] >> row_shift) & 1;
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target[2] = target[3] = target[10] = target[11] = (source[c] >> row_shift) & 2;
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target[4] = target[5] = target[12] = target[13] = (source[c] >> row_shift) & 4;
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target[6] = target[7] = (source[c] >> row_shift) & 8;
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graphics_carry_ = (source[c] >> row_shift) & 4;
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target += 14;
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}
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}
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void VideoBase::output_double_low_resolution(uint8_t *target, const uint8_t *const source, const uint8_t *const auxiliary_source, size_t length, int column, int row) const {
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const int row_shift = row&4;
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for(size_t c = 0; c < length; ++c) {
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if((column + int(c))&1) {
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target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 4;
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target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 8;
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target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 1;
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target[3] = (auxiliary_source[c] >> row_shift) & 2;
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target[8] = target[12] = (source[c] >> row_shift) & 8;
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target[9] = target[13] = (source[c] >> row_shift) & 1;
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target[10] = (source[c] >> row_shift) & 2;
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target[7] = target[11] = (source[c] >> row_shift) & 4;
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graphics_carry_ = (source[c] >> row_shift) & 8;
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} else {
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target[0] = target[4] = (auxiliary_source[c] >> row_shift) & 1;
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target[1] = target[5] = (auxiliary_source[c] >> row_shift) & 2;
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target[2] = target[6] = (auxiliary_source[c] >> row_shift) & 4;
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target[3] = (auxiliary_source[c] >> row_shift) & 8;
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target[8] = target[12] = (source[c] >> row_shift) & 2;
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target[9] = target[13] = (source[c] >> row_shift) & 4;
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target[10] = (source[c] >> row_shift) & 8;
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target[7] = target[11] = (source[c] >> row_shift) & 1;
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graphics_carry_ = (source[c] >> row_shift) & 2;
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}
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target += 14;
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}
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}
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void VideoBase::output_high_resolution(uint8_t *target, const uint8_t *const source, size_t length) const {
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for(size_t c = 0; c < length; ++c) {
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// High resolution graphics shift out LSB to MSB, optionally with a delay of half a pixel.
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// If there is a delay, the previous output level is held to bridge the gap.
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// Delays may be ignored on a IIe if Annunciator 3 is set; that's the state that
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// high_resolution_mask_ models.
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if(source[c] & high_resolution_mask_ & 0x80) {
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target[0] = graphics_carry_;
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target[1] = target[2] = source[c] & 0x01;
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target[3] = target[4] = source[c] & 0x02;
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target[5] = target[6] = source[c] & 0x04;
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target[7] = target[8] = source[c] & 0x08;
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target[9] = target[10] = source[c] & 0x10;
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target[11] = target[12] = source[c] & 0x20;
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target[13] = source[c] & 0x40;
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} else {
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target[0] = target[1] = source[c] & 0x01;
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target[2] = target[3] = source[c] & 0x02;
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target[4] = target[5] = source[c] & 0x04;
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target[6] = target[7] = source[c] & 0x08;
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target[8] = target[9] = source[c] & 0x10;
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target[10] = target[11] = source[c] & 0x20;
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target[12] = target[13] = source[c] & 0x40;
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}
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graphics_carry_ = source[c] & 0x40;
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target += 14;
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}
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}
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void VideoBase::output_double_high_resolution(uint8_t *target, const uint8_t *const source, const uint8_t *const auxiliary_source, size_t length) const {
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for(size_t c = 0; c < length; ++c) {
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target[0] = auxiliary_source[c] & 0x01;
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target[1] = auxiliary_source[c] & 0x02;
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target[2] = auxiliary_source[c] & 0x04;
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target[3] = auxiliary_source[c] & 0x08;
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target[4] = auxiliary_source[c] & 0x10;
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target[5] = auxiliary_source[c] & 0x20;
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target[6] = auxiliary_source[c] & 0x40;
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target[7] = source[c] & 0x01;
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target[8] = source[c] & 0x02;
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target[9] = source[c] & 0x04;
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target[10] = source[c] & 0x08;
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target[11] = source[c] & 0x10;
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target[12] = source[c] & 0x20;
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target[13] = source[c] & 0x40;
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graphics_carry_ = auxiliary_source[c] & 0x40;
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target += 14;
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}
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}
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