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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;

    memset(gfx_data.lcd_buffer, 0, GFX_LCD_BUFFER_SIZE);

    memset(gfx_data.buffer, 0, GFX_STRING_BUFFER_SIZE);

}

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' || c == '\r') {

        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;

    // Parse and create string

    va_list args;

    va_start(args, fmt);

    vsprintf((char *) gfx_data.buffer, fmt, args);

    va_end(args);

    len = strlen((char *) gfx_data.buffer);

    // Make sure string to insert fits in buffer, truncate if necessary

    if (len > GFX_STRING_BUFFER_SIZE)

        len = GFX_STRING_BUFFER_SIZE;

    // Print buffer to string

    for (i = 0; i < len; i++) {

        GFX_write(gfx_data.buffer[i]);

    }

}

void GFX_appendString(const rom char *fmt, ...) {

    unsigned char i, len;

    // Parse and create string

    va_list args;

    va_start(args, fmt);

    vsprintf((char *) gfx_data.buffer, fmt, args);

    va_end(args);

    // Make sure string to insert fits in buffer, truncate if necessary

    len = strlen((char *) gfx_data.buffer);

    if (len == 1) {  // This will only occur on "\n"

        // Do nothing?

        return;

    }

    if (len > GFX_STRING_BUFFER_SIZE)

        len = GFX_STRING_BUFFER_SIZE;

    // Omit the newline if string fill entire line

    if (((len - 1)%(GFX_width() / 6)) == 0) { // 16 or 10

        len -= 1;

    }

    // Shift everything right and insert string at beginning

    for (i = 127; i > len - 1; i--) {

        gfx_data.lcd_buffer[i] = gfx_data.lcd_buffer[i - len];

    }

    memcpy((char *)gfx_data.lcd_buffer, (const char *)gfx_data.buffer, len);

    // Print full buffer to screen

    GFX_clearScreen();

    GFX_setCursor(0,0);

    for (i = 0; i < GFX_LCD_BUFFER_SIZE-1; i++) {

        GFX_write(gfx_data.lcd_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;

}