Luma3DS-3GX/source/draw.c

/*
*   draw.c
*
*   Code to print to the screen by mid-kid @CakesFW
*/

#include "draw.h"
#include "screen.h"
#include "utils.h"
#include "fs.h"
#include "font.h"

static inline int strlen(const char *string)
{
    char *stringEnd = (char *)string;

    while(*stringEnd) stringEnd++;

    return stringEnd - string;
}

bool loadSplash(void)
{
    initScreens();

    //Don't delay boot if no splash image is on the SD
    if(fileRead(fb->top_left, "/luma/splash.bin") +
       fileRead(fb->bottom, "/luma/splashbottom.bin") != 0)
        return true;
    return false;
}

void drawCharacter(char character, int posX, int posY, u32 color)
{
    u8 *const select = fb->top_left;

    for(int y = 0; y < 8; y++)
    {
        char charPos = font[character * 8 + y];

        for(int x = 7; x >= 0; x--)
            if ((charPos >> x) & 1)
            {
                int screenPos = (posX * SCREEN_TOP_HEIGHT * 3 + (SCREEN_TOP_HEIGHT - y - posY - 1) * 3) + (7 - x) * 3 * SCREEN_TOP_HEIGHT;

                select[screenPos] = color >> 16;
                select[screenPos + 1] = color >> 8;
                select[screenPos + 2] = color;
            }
    }
}

int drawString(const char *string, int posX, int posY, u32 color)
{
    for(int i = 0, line_i = 0; i < strlen(string); i++, line_i++)
    {
        if(string[i] == '\n')
        {
            posY += SPACING_Y;
            line_i = 0;
            i++;
        }
        else if(line_i >= (SCREEN_TOP_WIDTH - posX) / SPACING_X)
        {
            // Make sure we never get out of the screen.
            posY += SPACING_Y;
            line_i = 2; //Little offset so we know the same string continues.
            if(string[i] == ' ') i++; //Spaces at the start look weird
        }

        drawCharacter(string[i], posX + line_i * SPACING_X, posY, color);
    }

    return posY;
}