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299 lines
6.4 KiB
C
299 lines
6.4 KiB
C
/**
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* dogs.c - Interface for drawing to the EADOGS102N-6 display.
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* Copyright (C) 2020 Clyne Sullivan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* See the GNU General Public License for more details.
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*/
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#include "bit-font2.h"
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//#include "ch.h"
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#include "dogs.h"
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#include "hal.h"
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#define SET_DATA palSetPad(GPIOC, 15)
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#define SET_CMD palClearPad(GPIOC, 15)
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#define CS_HIGH palSetPad(GPIOA, 4)
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#define CS_LOW palClearPad(GPIOA, 4)
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unsigned char dogs_buffer[DISP_WIDTH * DISP_HEIGHT / 8];
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//static volatile bool dogs_spi_done = false;
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#define spi_send(data, len) spiSend(&SPID1, len, data)
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//static void spi_send(unsigned char *data, unsigned int len)
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//{
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//dogs_spi_done = false;
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//spiStartSend(&SPID1, len, data);
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//while (!dogs_spi_done)
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// asm("wfi");
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//for (; len > 0; --len)
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// spiPolledExchange(&SPID1, *data++);
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//}
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static void dogs_init_display();
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//static void dogs_spi_callback(SPIDriver *spid)
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//{
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// if (spiIsBufferComplete(spid))
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// dogs_spi_done = true;
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//}
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void dogs_init()
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{
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// SPI
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palSetPadMode(GPIOB, 1, PAL_MODE_ALTERNATE(1)); // MOSI
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palSetPadMode(GPIOA, 5, PAL_MODE_ALTERNATE(0)); // CLK
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palSetPadMode(GPIOA, 4, PAL_MODE_OUTPUT_PUSHPULL); // nCS
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palSetPadMode(GPIOC, 14, PAL_MODE_OUTPUT_PUSHPULL); // nRST
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palSetPadMode(GPIOC, 15, PAL_MODE_OUTPUT_PUSHPULL); // CD
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palSetPad(GPIOA, 4);
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palSetPad(GPIOC, 14);
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palClearPad(GPIOC, 15);
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static const SPIConfig spicfg = {
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false,
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NULL /*dogs_spi_callback*/,
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0, // cr1
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0
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};
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spiStart(&SPID1, &spicfg);
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dogs_init_display();
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dogs_clear();
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dogs_flush();
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}
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void dogs_write_cmd(unsigned char byte)
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{
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spi_send(&byte, 1);
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}
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void dogs_set_column(unsigned int col)
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{
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dogs_write_cmd(0x10 | ((col >> 4) & 0xF));
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dogs_write_cmd(0x00 | (col & 0xF));
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}
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void dogs_set_power(unsigned int bits)
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{
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dogs_write_cmd(0x28 | (bits & 0x7));
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}
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void dogs_set_scroll_line(unsigned int startline)
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{
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dogs_write_cmd(0x40 | (startline & 0x3F));
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}
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void dogs_set_page(unsigned int page)
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{
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dogs_write_cmd(0xB0 | (page & 0xF));
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}
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void dogs_set_vlcd_ratio(unsigned int ratio)
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{
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dogs_write_cmd(0x20 | (ratio & 0x7));
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}
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void dogs_set_contrast(unsigned int value)
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{
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dogs_write_cmd(0x81);
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dogs_write_cmd(0x00 | (value & 0x3F));
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}
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void dogs_set_pixelson(bool on)
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{
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dogs_write_cmd(on ? 0xA5 : 0xA4);
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}
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void dogs_set_invert(bool invert)
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{
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dogs_write_cmd(invert ? 0xA7 : 0xA6);
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}
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void dogs_set_sleep(bool sleep)
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{
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dogs_write_cmd(sleep ? 0xAE : 0xAF);
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}
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void dogs_set_segdir(bool normal)
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{
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dogs_write_cmd(normal ? 0xA0 : 0xA1);
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}
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void dogs_set_comdir(bool normal)
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{
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dogs_write_cmd(normal ? 0xC0 : 0xC8);
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}
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void dogs_reset()
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{
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dogs_write_cmd(0xE2);
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}
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void dogs_set_bias(bool higher)
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{
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dogs_write_cmd(higher ? 0xA2 : 0xA3);
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}
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void dogs_set_advanced(unsigned int bits)
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{
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dogs_write_cmd(0xFA);
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dogs_write_cmd(0x10 | bits);
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}
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void dogs_init_display()
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{
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SET_CMD;
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CS_LOW;
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dogs_reset();
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CS_HIGH;
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unsigned long int reset_sleep = (STM32_SYSCLK / 1000) * 100;
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while (reset_sleep != 0) {
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asm("nop; nop; nop; nop; nop");
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reset_sleep -= 8;
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}
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CS_LOW;
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dogs_set_scroll_line(0);
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dogs_set_segdir(true);
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dogs_set_comdir(false);
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dogs_set_pixelson(false);
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dogs_set_invert(false);
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dogs_set_bias(true);
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dogs_set_power(0x07);
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dogs_set_vlcd_ratio(7);
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dogs_set_contrast(12);
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dogs_set_advanced(0x83);
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dogs_set_sleep(false);
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CS_HIGH;
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}
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void dogs_clear()
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{
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uint32_t *ptr = (uint32_t *)dogs_buffer;
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unsigned int count = sizeof(dogs_buffer) / sizeof(uint32_t) / 12;
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for (; count; --count) {
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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*ptr++ = 0;
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}
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}
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void dogs_flush()
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{
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unsigned char *ptr = dogs_buffer;
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CS_LOW;
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for (int page = 0; page < 8; ++page) {
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SET_CMD;
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dogs_set_page(page);
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dogs_set_column(30);
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SET_DATA;
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spi_send(ptr, 102);
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ptr += 102;
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}
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CS_HIGH;
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}
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void draw_pixel(int x, int y, bool state)
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{
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if (x < 0 || y < 0 || x >= DISP_WIDTH || y >= DISP_HEIGHT)
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return;
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y = DISP_HEIGHT - 1 - y;
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if (state)
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dogs_buffer[y / 8 * DISP_WIDTH + x] |= (1 << (y % 8));
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else
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dogs_buffer[y / 8 * DISP_WIDTH + x] &= ~(1 << (y % 8));
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}
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void draw_rect(int x, int y, int w, int h)
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{
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for (int i = 0; i < w; i++) {
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for (int j = 0; j < h; j++)
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draw_pixel(x + i, y + j, true);
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}
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}
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void draw_bitmap_wh(int x, int y, int w, int h, const unsigned char *data)
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{
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int sbit = 0;
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for (int j = 0; j < h; j++) {
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for (int i = 0; i < w; i++) {
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draw_pixel(x + i, y + j, *data & (1 << sbit));
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if (++sbit == 8) {
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sbit = 0;
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++data;
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}
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}
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}
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}
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void draw_bitmap(int x, int y, const unsigned char *buffer)
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{
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draw_bitmap_wh(x, y, buffer[0], buffer[1], buffer + 2);
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}
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void draw_glyph(int ix, int iy, unsigned int glyph)
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{
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const unsigned char *ptr;
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int x, y, sbit, tbits;
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x = ix + 5;
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y = iy;
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ptr = bitfontGetBitmapLo(glyph);
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sbit = 0;
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tbits = 18;
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draw_glyph_loop:
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for (int i = 0; i < tbits; ++i) {
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draw_pixel(x, y, *ptr & (1 << sbit));
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if (x == ix) {
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x += 5;
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++y;
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} else {
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--x;
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}
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if (sbit == 7) {
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sbit = 0;
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++ptr;
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} else {
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++sbit;
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}
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}
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if (tbits == 18) {
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ptr = bitfontGetBitmapHi(glyph);
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sbit = 0;
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tbits = 24;
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goto draw_glyph_loop;
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}
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}
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void draw_number(int x, int y, int number)
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{
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// TODO Handle negatives better?
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if (number < 0)
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number = -number;
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// Count digits
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int tmp = number;
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int count;
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for (count = 0; tmp; count++)
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tmp /= 10;
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if (count == 0)
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count = 1;
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// Draw digits
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x += count * 7;
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do {
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x -= 7;
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draw_glyph(x, y, bitfontGetGlyph('0' + (number % 10)));
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} while (number /= 10);
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}
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