136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
/*
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* Copyright (C) 2019 Max Regan
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#pragma once
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#include "Bsp/Task.h"
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#include "Bsp/Drivers/SpiDriver.h"
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#include "Bsp/font.h"
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namespace BSP {
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class DisplayDriver final : public Common::Schedule::Task {
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public:
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DisplayDriver(Common::Schedule::TaskScheduler &scheduler, SpiDriver &spi);
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/**
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* Common::Schedule::Task
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*/
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Common::ReturnCode init();
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Common::Schedule::NextTime execute() override;
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static constexpr uint32_t BITS_PER_PIXEL = 3;
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enum class Color : uint8_t {
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BLACK = 0,
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BLUE = 4,
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GREEN = 2,
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CYAN = 6,
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RED = 1,
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MAGENTA = 5,
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YELLOW = 3,
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WHITE = 7,
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};
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static constexpr Color DEFAULT_COLOR = Color::BLACK;
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/**
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* DisplayDriver
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*/
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void inline set_pixel(uint32_t x, uint32_t y, Color color=DEFAULT_COLOR);
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void char_at(uint32_t *x_off, uint32_t y_off, char c, const struct font *font, Color color=DEFAULT_COLOR);
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void string_at(uint32_t *x_off, uint32_t y_off,
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const char *string, const struct font *font,
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Color color=DEFAULT_COLOR);
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void draw_hline(uint32_t x, uint32_t y, uint32_t width, Color color=DEFAULT_COLOR);
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void refresh();
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void clear(Color color=Color::WHITE);
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inline uint32_t get_width() {
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return DISPLAY_WIDTH;
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}
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inline uint32_t get_height() {
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return DISPLAY_HEIGHT;
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}
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private:
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void buffer_init(Color color);
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void set_dirty(unsigned int y);
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const struct glyph *glyph_for_char(const struct font *font, char c);
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void write_glyph(uint32_t x_off, uint32_t y_off,
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const struct font *font, const struct glyph *g,
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Color color);
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static constexpr uint32_t DISPLAY_WIDTH = 128;
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static constexpr uint32_t DISPLAY_HEIGHT = 128;
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struct display_line
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{
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uint8_t mode;
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uint8_t line;
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uint8_t data[DISPLAY_WIDTH * BITS_PER_PIXEL / 8];
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};
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struct display_buffer
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{
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struct display_line lines[DISPLAY_HEIGHT];
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uint16_t dummy;
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};
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Common::Schedule::TaskScheduler &m_scheduler;
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SpiDriver &m_spi;
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struct display_buffer m_buffer;
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bool m_is_dirty;
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uint8_t m_dirty_line_min;
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uint8_t m_dirty_line_max;
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};
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void inline DisplayDriver::set_pixel(uint32_t x, uint32_t y, Color color)
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{
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struct display_line &line = m_buffer.lines[y];
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uint32_t x_pos = x * BITS_PER_PIXEL;
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uint32_t x_byte = x_pos / 8;
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uint32_t x_bit = x_pos % 8;
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uint8_t c = (uint8_t) color;
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constexpr uint8_t mask = (1 << BITS_PER_PIXEL) - 1;
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if (x_bit + BITS_PER_PIXEL > 8) {
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line.data[x_byte] &= ~(mask << x_bit);
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line.data[x_byte] |= c << x_bit;
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x_byte++;
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line.data[x_byte] &= ~(mask >> (8 - x_bit));
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line.data[x_byte] |= c >> (8 - x_bit);
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} else {
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line.data[x_byte] &= ~(mask << x_bit);
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line.data[x_byte] |= c << x_bit;
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}
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set_dirty(y);
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}
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}
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