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#include "maindefs.h"
#include "Adafruit_GFX.h"
#include "glcdfont.c"
#include "oled_ssd1306.h"
#include "oled_ssd1331.h"
#include <string.h>
#include <stdio.h>

static GFX_DATA gfx_data;

void GFX_Init(int w, int h) {
    gfx_data._width = gfx_data.WIDTH = w;
    gfx_data._height = gfx_data.HEIGHT = h;
    gfx_data.rotation = 0;
    gfx_data.cursor_x = gfx_data.cursor_y = 0;
    gfx_data.textsize = 1;
    gfx_data.textcolor = gfx_data.textbgcolor = 0xFFFF;
    gfx_data.wrap = 1;
}

int GFX_Abs(int i) {
    if (i < 0)
        return -i;
    else
        return i;
}

void GFX_Swap(int *a, int *b) {
    int tmp = *a;
    *a = *b;
    *b = tmp;
}

void GFX_drawLine(int x0, int y0, int x1, int y1, unsigned int color) {
#ifdef GFX_SSD1306
    int dx, dy, err, ystep;
    int steep = GFX_Abs(y1 - y0) > GFX_Abs(x1 - x0);
    if (steep) {
        GFX_Swap(&x0, &y0);
        GFX_Swap(&x1, &y1);
    }

    if (x0 > x1) {
        GFX_Swap(&x0, &x1);
        GFX_Swap(&y0, &y1);
    }

    dx = x1 - x0;
    dy = GFX_Abs(y1 - y0);

    err = dx / 2;

    if (y0 < y1) {
        ystep = 1;
    } else {
        ystep = -1;
    }

    for (; x0 <= x1; x0++) {

        if (steep) {
            SSD1306_Draw_Pixel(y0, x0, color);
        } else {
            SSD1306_Draw_Pixel(x0, y0, color);
        }
        err -= dy;
        if (err < 0) {
            y0 += ystep;
            err += dx;
        }
    }
#endif
#ifdef GFX_SSD1331
    SSD1331_Draw_Line(x0, y0, x1, y1, color);
#endif
}

void GFX_drawFastVLine(int x, int y, int h, unsigned int color) {
    GFX_drawLine(x, y, x, y + h - 1, color);
}

void GFX_drawFastHLine(int x, int y, int w, unsigned int color) {
    GFX_drawLine(x, y, x + w - 1, y, color);
}

void GFX_drawRect(int x, int y, int w, int h, unsigned int color) {
#ifdef GFX_SSD1306
    GFX_drawFastHLine(x, y, w, color);
    GFX_drawFastHLine(x, y + h, w, color);
    GFX_drawFastVLine(x, y, h, color);
    GFX_drawFastVLine(x + w, y, h, color);
#endif
#ifdef GFX_SSD1331
    SSD1331_Draw_Rect(x, y, x + w, y + h, color);
#endif
}

void GFX_fillRect(int x, int y, int w, int h, unsigned int color) {
#ifdef GFX_SSD1306
    int i;
    for (i = x; i < x + w; i++) {
        GFX_drawFastVLine(i, y, h, color);
    }
#endif
#ifdef GFX_SSD1331
    SSD1331_Fill_Rect(x, y, x + w, y + h, color);
#endif
}

void GFX_fillScreen(unsigned int color) {
    GFX_fillRect(0, 0, gfx_data._width, gfx_data._height, color);
}

void GFX_clearScreen() {
#ifdef GFX_SSD1306
    GFX_fillScreen(SSD1306_BLACK);
#endif
#ifdef GFX_SSD1331
    SSD1331_Clear_Display();
#endif
}

void GFX_drawCircle(int x0, int y0, int r, unsigned int color) {
    int f = 1 - r;
    int ddF_x = 1;
    int ddF_y = -2 * r;
    int x = 0;
    int y = r;

#ifdef GFX_SSD1306
    SSD1306_Draw_Pixel(x0, y0 + r, color);
    SSD1306_Draw_Pixel(x0, y0 - r, color);
    SSD1306_Draw_Pixel(x0 + r, y0, color);
    SSD1306_Draw_Pixel(x0 - r, y0, color);
#endif
#ifdef GFX_SSD1331
    SSD1331_Draw_Pixel(x0, y0 + r, color);
    SSD1331_Draw_Pixel(x0, y0 - r, color);
    SSD1331_Draw_Pixel(x0 + r, y0, color);
    SSD1331_Draw_Pixel(x0 - r, y0, color);
#endif

    while (x < y) {
        if (f >= 0) {
            y--;
            ddF_y += 2;
            f += ddF_y;
        }
        x++;
        ddF_x += 2;
        f += ddF_x;

#ifdef GFX_SSD1306
        SSD1306_Draw_Pixel(x0 + x, y0 + y, color);
        SSD1306_Draw_Pixel(x0 - x, y0 + y, color);
        SSD1306_Draw_Pixel(x0 + x, y0 - y, color);
        SSD1306_Draw_Pixel(x0 - x, y0 - y, color);
        SSD1306_Draw_Pixel(x0 + y, y0 + x, color);
        SSD1306_Draw_Pixel(x0 - y, y0 + x, color);
        SSD1306_Draw_Pixel(x0 + y, y0 - x, color);
        SSD1306_Draw_Pixel(x0 - y, y0 - x, color);
#endif
#ifdef GFX_SSD1331
        SSD1331_Draw_Pixel(x0 + x, y0 + y, color);
        SSD1331_Draw_Pixel(x0 - x, y0 + y, color);
        SSD1331_Draw_Pixel(x0 + x, y0 - y, color);
        SSD1331_Draw_Pixel(x0 - x, y0 - y, color);
        SSD1331_Draw_Pixel(x0 + y, y0 + x, color);
        SSD1331_Draw_Pixel(x0 - y, y0 + x, color);
        SSD1331_Draw_Pixel(x0 + y, y0 - x, color);
        SSD1331_Draw_Pixel(x0 - y, y0 - x, color);
#endif
    }
}

void GFX_drawCircleHelper(int x0, int y0, int r, unsigned char cornername, unsigned int color) {
    int f = 1 - r;
    int ddF_x = 1;
    int ddF_y = -2 * r;
    int x = 0;
    int y = r;

    while (x < y) {
        if (f >= 0) {
            y--;
            ddF_y += 2;
            f += ddF_y;
        }
        x++;
        ddF_x += 2;
        f += ddF_x;
#ifdef GFX_SSD1306
        if (cornername & 0x4) {
            SSD1306_Draw_Pixel(x0 + x, y0 + y, color);
            SSD1306_Draw_Pixel(x0 + y, y0 + x, color);
        }
        if (cornername & 0x2) {
            SSD1306_Draw_Pixel(x0 + x, y0 - y, color);
            SSD1306_Draw_Pixel(x0 + y, y0 - x, color);
        }
        if (cornername & 0x8) {
            SSD1306_Draw_Pixel(x0 - y, y0 + x, color);
            SSD1306_Draw_Pixel(x0 - x, y0 + y, color);
        }
        if (cornername & 0x1) {
            SSD1306_Draw_Pixel(x0 - y, y0 - x, color);
            SSD1306_Draw_Pixel(x0 - x, y0 - y, color);
        }
#endif
#ifdef GFX_SSD1331
        if (cornername & 0x4) {
            SSD1331_Draw_Pixel(x0 + x, y0 + y, color);
            SSD1331_Draw_Pixel(x0 + y, y0 + x, color);
        }
        if (cornername & 0x2) {
            SSD1331_Draw_Pixel(x0 + x, y0 - y, color);
            SSD1331_Draw_Pixel(x0 + y, y0 - x, color);
        }
        if (cornername & 0x8) {
            SSD1331_Draw_Pixel(x0 - y, y0 + x, color);
            SSD1331_Draw_Pixel(x0 - x, y0 + y, color);
        }
        if (cornername & 0x1) {
            SSD1331_Draw_Pixel(x0 - y, y0 - x, color);
            SSD1331_Draw_Pixel(x0 - x, y0 - y, color);
        }
#endif
    }
}

void GFX_fillCircle(int x0, int y0, int r, unsigned int color) {
    GFX_drawFastVLine(x0, y0 - r, 2 * r + 1, color);
    GFX_fillCircleHelper(x0, y0, r, 3, 0, color);
}

void GFX_fillCircleHelper(int x0, int y0, int r, unsigned char cornername, int delta, unsigned int color) {
    int f = 1 - r;
    int ddF_x = 1;
    int ddF_y = -2 * r;
    int x = 0;
    int y = r;

    while (x < y) {
        if (f >= 0) {
            y--;
            ddF_y += 2;
            f += ddF_y;
        }
        x++;
        ddF_x += 2;
        f += ddF_x;

        if (cornername & 0x1) {
            GFX_drawFastVLine(x0 + x, y0 - y, 2 * y + 1 + delta, color);
            GFX_drawFastVLine(x0 + y, y0 - x, 2 * x + 1 + delta, color);
        }
        if (cornername & 0x2) {
            GFX_drawFastVLine(x0 - x, y0 - y, 2 * y + 1 + delta, color);
            GFX_drawFastVLine(x0 - y, y0 - x, 2 * x + 1 + delta, color);
        }
    }
}

void GFX_drawTriangle(int x0, int y0, int x1, int y1, int x2, int y2, unsigned int color) {
    GFX_drawLine(x0, y0, x1, y1, color);
    GFX_drawLine(x1, y1, x2, y2, color);
    GFX_drawLine(x2, y2, x0, y0, color);
}

void GFX_fillTriangle(int x0, int y0, int x1, int y1, int x2, int y2, unsigned int color) {
    int a, b, y, last;
    int dx01 = x1 - x0;
    int dy01 = y1 - y0;
    int dx02 = x2 - x0;
    int dy02 = y2 - y0;
    int dx12 = x2 - x1;
    int dy12 = y2 - y1;
    int sa = 0;
    int sb = 0;

    // Sort coordinates by Y order (y2 >= y1 >= y0)
    if (y0 > y1) {
        GFX_Swap(&y0, &y1);
        GFX_Swap(&x0, &x1);
    }
    if (y1 > y2) {
        GFX_Swap(&y2, &y1);
        GFX_Swap(&x2, &x1);
    }
    if (y0 > y1) {
        GFX_Swap(&y0, &y1);
        GFX_Swap(&x0, &x1);
    }

    if (y0 == y2) { // Handle awkward all-on-same-line case as its own thing
        a = b = x0;
        if (x1 < a) a = x1;
        else if (x1 > b) b = x1;
        if (x2 < a) a = x2;
        else if (x2 > b) b = x2;
        GFX_drawFastHLine(a, y0, b - a + 1, color);
        return;
    }

    // For upper part of triangle, find scanline crossings for segments
    // 0-1 and 0-2.  If y1=y2 (flat-bottomed triangle), the scanline y1
    // is included here (and second loop will be skipped, avoiding a /0
    // error there), otherwise scanline y1 is skipped here and handled
    // in the second loop...which also avoids a /0 error here if y0=y1
    // (flat-topped triangle).
    if (y1 == y2) last = y1; // Include y1 scanline
    else last = y1 - 1; // Skip it

    for (y = y0; y <= last; y++) {
        a = x0 + sa / dy01;
        b = x0 + sb / dy02;
        sa += dx01;
        sb += dx02;
        /* longhand:
        a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
        b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
         */
        if (a > b) GFX_Swap(&a, &b);
        GFX_drawFastHLine(a, y, b - a + 1, color);
    }

    // For lower part of triangle, find scanline crossings for segments
    // 0-2 and 1-2.  This loop is skipped if y1=y2.
    sa = dx12 * (y - y1);
    sb = dx02 * (y - y0);
    for (; y <= y2; y++) {
        a = x1 + sa / dy12;
        b = x0 + sb / dy02;
        sa += dx12;
        sb += dx02;
        /* longhand:
        a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
        b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
         */
        if (a > b) GFX_Swap(&a, &b);
        GFX_drawFastHLine(a, y, b - a + 1, color);
    }
}

void GFX_drawRoundRect(int x, int y, int w, int h, int r, unsigned int color) {
    // smarter version
    GFX_drawFastHLine(x + r, y, w - 2 * r, color); // Top
    GFX_drawFastHLine(x + r, y + h - 1, w - 2 * r, color); // Bottom
    GFX_drawFastVLine(x, y + r, h - 2 * r, color); // Left
    GFX_drawFastVLine(x + w - 1, y + r, h - 2 * r, color); // Right

    // draw four corners
    GFX_drawCircleHelper(x + r, y + r, r, 1, color);
    GFX_drawCircleHelper(x + w - r - 1, y + r, r, 2, color);
    GFX_drawCircleHelper(x + w - r - 1, y + h - r - 1, r, 4, color);
    GFX_drawCircleHelper(x + r, y + h - r - 1, r, 8, color);
}

void GFX_fillRoundRect(int x, int y, int w, int h, int r, unsigned int color) {
    // smarter version
    GFX_fillRect(x + r, y, w - 2 * r, h, color);

    // draw four corners
    GFX_fillCircleHelper(x + w - r - 1, y + r, r, 1, h - 2 * r - 1, color);
    GFX_fillCircleHelper(x + r, y + r, r, 2, h - 2 * r - 1, color);
}

void GFX_drawBitmap(int x, int y, const unsigned char* bitmap, int w, int h, unsigned int color) {
    int i, j;
    for (j = 0; j < h; j++) {
        for (i = 0; i < w; i++) {
            if (bitmap[i + (j / 8) * w] & (j % 8)) {
#ifdef GFX_SSD1306
                SSD1306_Draw_Pixel(x + i, y + j, color);
#endif
#ifdef GFX_SSD1331
                SSD1331_Draw_Pixel(x + i, y + j, color);
#endif
            }
        }
    }
}

void GFX_drawChar(int x, int y, unsigned char c, unsigned int color, unsigned int bg, unsigned char size) {
    int i, j;
    unsigned int line;

    if ((x >= gfx_data._width) || // Clip right
            (y >= gfx_data._height) || // Clip bottom
            ((x + 5 * size - 1) < 0) || // Clip left
            ((y + 8 * size - 1) < 0)) // Clip top
        return;

    for (i = 0; i < 6; i++) {
        if (i == 5)
            line = 0x0;
        else
            line = font[(c * 5) + i];
        for (j = 0; j < 8; j++) {
            if (line & 0x1) {
                if (size == 1) {// default size
#ifdef GFX_SSD1306
                    SSD1306_Draw_Pixel(x + i, y + j, color);
#endif
#ifdef GFX_SSD1331
                    SSD1331_Draw_Pixel(x + i, y + j, color);
#endif
                } else { // big size
                    GFX_fillRect(x + (i * size), y + (j * size), size, size, color);
                }
            } else if (bg != color) {
                if (size == 1) { // default size
#ifdef GFX_SSD1306
                    SSD1306_Draw_Pixel(x + i, y + j, bg);
#endif
#ifdef GFX_SSD1331
                    SSD1331_Draw_Pixel(x + i, y + j, bg);
#endif
                } else { // big size
                    GFX_fillRect(x + i*size, y + j*size, size, size, bg);
                }
            }
            line >>= 1;
        }
    }
}

void GFX_write(unsigned char c) {
    if (c == '\n') {
        gfx_data.cursor_y += gfx_data.textsize * 8;
        gfx_data.cursor_x = 0;
    } else if (c == '\r') {
        // skip em
    } else {
        GFX_drawChar(gfx_data.cursor_x, gfx_data.cursor_y, c, gfx_data.textcolor, gfx_data.textbgcolor, gfx_data.textsize);
        gfx_data.cursor_x += gfx_data.textsize * 6;
        if (gfx_data.wrap && (gfx_data.cursor_x > (gfx_data._width - gfx_data.textsize * 6))) {
            gfx_data.cursor_y += gfx_data.textsize * 8;
            gfx_data.cursor_x = 0;
        }
    }
}

void GFX_writeString(const rom char *fmt, ...) {
    unsigned char i, len;
    va_list args;
    va_start(args, fmt);
    vsprintf((char *) gfx_data.buffer, fmt, args);
    va_end(args);
    len = strlen((char *) gfx_data.buffer);
    for (i = 0; i < len; i++) {
        GFX_write(gfx_data.buffer[i]);
    }
}

void GFX_setCursor(int x, int y) {
    gfx_data.cursor_x = x;
    gfx_data.cursor_y = y;
}

void GFX_setTextColor(unsigned int c) {
    // for 'transparent' background, we'll set the bg
    // to the same as fg instead of using a flag
    gfx_data.textcolor = c;
    gfx_data.textbgcolor = c;
}

void GFX_setTextColorBG(unsigned int c, unsigned int bg) {
    gfx_data.textcolor = c;
    gfx_data.textbgcolor = bg;
}

void GFX_setTextSize(unsigned char s) {
    gfx_data.textsize = (s > 0) ? s : 1;
}

void GFX_setTextWrap(unsigned char w) {
    gfx_data.wrap = w;
}

void GFX_setRotation(unsigned char x) {
    x %= 4; // cant be higher than 3
    gfx_data.rotation = x;
    switch (x) {
        case 0:
        case 2:
            gfx_data._width = gfx_data.WIDTH;
            gfx_data._height = gfx_data.HEIGHT;
            break;
        case 1:
        case 3:
            gfx_data._width = gfx_data.HEIGHT;
            gfx_data._height = gfx_data.WIDTH;
            break;
    }
}

unsigned char GFX_getRotation() {
    gfx_data.rotation %= 4;
    return gfx_data.rotation;
}

int GFX_height() {
    return gfx_data._height;
}

int GFX_width() {
    return gfx_data._width;
}