draw_text example

#include <Arduino.h>
#include <tft_io.hpp>
#include <ili9341.hpp>
#include <gfx_cpp14.hpp>

#include "Maziro.h"

using namespace arduino;
using namespace gfx;
#define LCD_HOST    VSPI
#define PIN_NUM_MISO 25
#define PIN_NUM_MOSI 23
#define PIN_NUM_CLK  19
#define PIN_NUM_CS   22
#define LCD_WRITE_SPEED_PERCENT 400 // 40MHz
#define LCD_READ_SPEED_PERCENT 200 // 20MHz
#define PIN_NUM_DC   21
#define PIN_NUM_RST  18
#define PIN_NUM_BKL 5
#define LCD_BKL_HIGH false
#define LCD_WIDTH 240
#define LCD_HEIGHT 320
#define LCD_ROTATION 1

using bus_type = tft_spi_ex<LCD_HOST,
                            PIN_NUM_CS,
                            PIN_NUM_MOSI,
                            PIN_NUM_MISO,
                            PIN_NUM_CLK,
                            SPI_MODE0,
                            PIN_NUM_MISO<0
#ifdef OPTIMIZE_DMA
                            ,(LCD_WIDTH*LCD_HEIGHT)*2+8
#endif
>;

using lcd_type = ili9341<PIN_NUM_DC,
                        PIN_NUM_RST,
                        PIN_NUM_BKL,
                        bus_type,
                        LCD_ROTATION,
                        LCD_BKL_HIGH,
                        LCD_WRITE_SPEED_PERCENT,
                        LCD_READ_SPEED_PERCENT>;

using lcd_color = color<typename lcd_type::pixel_type>;
lcd_type lcd;

void draw_text(spoint16 loc, const open_font& fnt,const char* text, float scale, rgb_pixel<16> fg,rgb_pixel<16> bg) {
  size16 text_size = (size16)fnt.measure_text((ssize16)lcd.dimensions(),{0,0},text,scale);
  // just a little padding
  text_size.width+=2;
  text_size.height+=2;
  using bt = bitmap<rgb_pixel<16>>;
  uint8_t* buf = (uint8_t*)malloc(bt::sizeof_buffer(text_size));
  if(nullptr==buf) {
    return;
  }
  bt tmp(text_size,buf);
  tmp.fill(tmp.bounds(),bg);
  draw::text(tmp,(srect16)tmp.bounds(),{0,0},text,fnt,scale,fg);
  draw::bitmap(lcd,srect16(loc,(spoint16)lcd.bounds().bottom_right()),tmp,tmp.bounds());
  free(buf);
}

void setup() {
  // put your setup code here, to run once:
  lcd.fill(lcd.bounds(),lcd_color::white);
  draw_text({10,10},Maziro_ttf,"HELLO WORLD!",Maziro_ttf.scale(40),lcd_color::indian_red,lcd_color::white);
}

void loop() {
  // put your main code here, to run repeatedly:
}