545 lines
13 KiB
C
545 lines
13 KiB
C
/*
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* This is the core graphics library for all our displays, providing a common
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* set of graphics primitives (points, lines, circles, etc.). It needs to be
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* paired with a hardware-specific library for each display device we carry
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* (to handle the lower-level functions).
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*
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* Adafruit invests time and resources providing this open source code, please
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* support Adafruit & open-source hardware by purchasing products from Adafruit!
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*
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* Copyright (c) 2013 Adafruit Industries. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Modified the AdaFruit library to be a C library, changed the font and
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* generally munged it in a variety of ways, creating a reasonably quick
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* and dirty way to put something "interesting" on the LCD display.
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* --Chuck McManis (2013, 2014)
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*
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*/
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#include <stdint.h>
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#include <math.h>
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#include <stdlib.h>
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#include "gfx.h"
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#include "font-7x12.c"
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#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
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struct gfx_state __gfx_state;
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void
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gfx_drawPixel(int x, int y, uint16_t color)
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{
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if ((x < 0) || (x >= __gfx_state._width) ||
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(y < 0) || (y >= __gfx_state._height)) {
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return; /* off screen so don't draw it */
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}
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(__gfx_state.drawpixel)(x, y, color);
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}
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#define true 1
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void
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gfx_init(void (*pixel_func)(int, int, uint16_t), int width, int height)
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{
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__gfx_state._width = width;
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__gfx_state._height = height;
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__gfx_state.rotation = 0;
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__gfx_state.cursor_y = __gfx_state.cursor_x = 0;
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__gfx_state.textsize = 1;
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__gfx_state.textcolor = 0;
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__gfx_state.textbgcolor = 0xFFFF;
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__gfx_state.wrap = true;
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__gfx_state.drawpixel = pixel_func;
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}
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/* Draw a circle outline */
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void gfx_drawCircle(int16_t x0, int16_t y0, int16_t r,
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uint16_t color)
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{
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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gfx_drawPixel(x0 , y0+r, color);
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gfx_drawPixel(x0 , y0-r, color);
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gfx_drawPixel(x0+r, y0 , color);
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gfx_drawPixel(x0-r, y0 , color);
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while (x < y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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gfx_drawPixel(x0 + x, y0 + y, color);
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gfx_drawPixel(x0 - x, y0 + y, color);
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gfx_drawPixel(x0 + x, y0 - y, color);
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gfx_drawPixel(x0 - x, y0 - y, color);
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gfx_drawPixel(x0 + y, y0 + x, color);
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gfx_drawPixel(x0 - y, y0 + x, color);
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gfx_drawPixel(x0 + y, y0 - x, color);
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gfx_drawPixel(x0 - y, y0 - x, color);
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}
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}
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void gfx_drawCircleHelper(int16_t x0, int16_t y0,
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int16_t r, uint8_t cornername, uint16_t color)
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{
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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while (x < y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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if (cornername & 0x4) {
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gfx_drawPixel(x0 + x, y0 + y, color);
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gfx_drawPixel(x0 + y, y0 + x, color);
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}
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if (cornername & 0x2) {
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gfx_drawPixel(x0 + x, y0 - y, color);
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gfx_drawPixel(x0 + y, y0 - x, color);
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}
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if (cornername & 0x8) {
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gfx_drawPixel(x0 - y, y0 + x, color);
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gfx_drawPixel(x0 - x, y0 + y, color);
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}
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if (cornername & 0x1) {
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gfx_drawPixel(x0 - y, y0 - x, color);
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gfx_drawPixel(x0 - x, y0 - y, color);
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}
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}
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}
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void gfx_fillCircle(int16_t x0, int16_t y0, int16_t r,
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uint16_t color)
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{
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gfx_drawFastVLine(x0, y0 - r, 2*r+1, color);
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gfx_fillCircleHelper(x0, y0, r, 3, 0, color);
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}
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/* Used to do circles and roundrects */
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void gfx_fillCircleHelper(int16_t x0, int16_t y0, int16_t r,
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uint8_t cornername, int16_t delta, uint16_t color)
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{
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int16_t f = 1 - r;
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int16_t ddF_x = 1;
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int16_t ddF_y = -2 * r;
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int16_t x = 0;
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int16_t y = r;
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while (x < y) {
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if (f >= 0) {
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y--;
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ddF_y += 2;
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f += ddF_y;
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}
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x++;
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ddF_x += 2;
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f += ddF_x;
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if (cornername & 0x1) {
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gfx_drawFastVLine(x0+x, y0-y, 2*y+1+delta, color);
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gfx_drawFastVLine(x0+y, y0-x, 2*x+1+delta, color);
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}
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if (cornername & 0x2) {
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gfx_drawFastVLine(x0-x, y0-y, 2*y+1+delta, color);
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gfx_drawFastVLine(x0-y, y0-x, 2*x+1+delta, color);
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}
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}
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}
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/* Bresenham's algorithm - thx wikpedia */
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void gfx_drawLine(int16_t x0, int16_t y0,
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int16_t x1, int16_t y1,
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uint16_t color)
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{
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int16_t steep = abs(y1 - y0) > abs(x1 - x0);
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if (steep) {
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swap(x0, y0);
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swap(x1, y1);
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}
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if (x0 > x1) {
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swap(x0, x1);
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swap(y0, y1);
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}
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int16_t dx, dy;
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dx = x1 - x0;
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dy = abs(y1 - y0);
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int16_t err = dx / 2;
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int16_t ystep;
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if (y0 < y1) {
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ystep = 1;
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} else {
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ystep = -1;
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}
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for (; x0 <= x1; x0++) {
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if (steep) {
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gfx_drawPixel(y0, x0, color);
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} else {
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gfx_drawPixel(x0, y0, color);
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}
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err -= dy;
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if (err < 0) {
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y0 += ystep;
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err += dx;
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}
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}
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}
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/* Draw a rectangle */
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void gfx_drawRect(int16_t x, int16_t y,
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int16_t w, int16_t h,
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uint16_t color)
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{
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gfx_drawFastHLine(x, y, w, color);
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gfx_drawFastHLine(x, y + h - 1, w, color);
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gfx_drawFastVLine(x, y, h, color);
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gfx_drawFastVLine(x + w - 1, y, h, color);
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}
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void gfx_drawFastVLine(int16_t x, int16_t y,
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int16_t h, uint16_t color)
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{
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/* Update in subclasses if desired! */
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gfx_drawLine(x, y, x, y + h - 1, color);
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}
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void gfx_drawFastHLine(int16_t x, int16_t y,
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int16_t w, uint16_t color)
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{
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/* Update in subclasses if desired! */
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gfx_drawLine(x, y, x + w - 1, y, color);
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}
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void gfx_fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
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uint16_t color)
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{
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/* Update in subclasses if desired! */
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int16_t i;
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for (i = x; i < x + w; i++) {
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gfx_drawFastVLine(i, y, h, color);
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}
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}
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void gfx_fillScreen(uint16_t color)
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{
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gfx_fillRect(0, 0, __gfx_state._width, __gfx_state._height, color);
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}
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/* Draw a rounded rectangle */
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void gfx_drawRoundRect(int16_t x, int16_t y, int16_t w,
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int16_t h, int16_t r, uint16_t color)
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{
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/* smarter version */
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gfx_drawFastHLine(x + r , y , w - 2 * r, color); /* Top */
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gfx_drawFastHLine(x + r , y + h - 1, w - 2 * r, color); /* Bottom */
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gfx_drawFastVLine(x , y + r , h - 2 * r, color); /* Left */
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gfx_drawFastVLine(x + w - 1, y + r , h - 2 * r, color); /* Right */
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/* draw four corners */
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gfx_drawCircleHelper(x + r , y + r , r, 1, color);
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gfx_drawCircleHelper(x + w - r - 1, y + r , r, 2, color);
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gfx_drawCircleHelper(x + w - r - 1, y + h - r - 1, r, 4, color);
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gfx_drawCircleHelper(x + r , y + h - r - 1, r, 8, color);
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}
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/* Fill a rounded rectangle */
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void gfx_fillRoundRect(int16_t x, int16_t y, int16_t w,
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int16_t h, int16_t r, uint16_t color) {
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/* smarter version */
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gfx_fillRect(x + r, y, w - 2 * r, h, color);
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/* draw four corners */
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gfx_fillCircleHelper(x + w - r - 1, y + r, r, 1, h - 2 * r - 1, color);
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gfx_fillCircleHelper(x + r , y + r, r, 2, h - 2 * r - 1, color);
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}
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/* Draw a triangle */
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void gfx_drawTriangle(int16_t x0, int16_t y0,
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int16_t x1, int16_t y1,
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int16_t x2, int16_t y2, uint16_t color)
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{
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gfx_drawLine(x0, y0, x1, y1, color);
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gfx_drawLine(x1, y1, x2, y2, color);
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gfx_drawLine(x2, y2, x0, y0, color);
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}
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/* Fill a triangle */
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void gfx_fillTriangle(int16_t x0, int16_t y0,
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int16_t x1, int16_t y1,
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int16_t x2, int16_t y2, uint16_t color)
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{
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int16_t a, b, y, last;
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/* Sort coordinates by Y order (y2 >= y1 >= y0) */
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if (y0 > y1) {
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swap(y0, y1); swap(x0, x1);
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}
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if (y1 > y2) {
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swap(y2, y1); swap(x2, x1);
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}
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if (y0 > y1) {
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swap(y0, y1); swap(x0, x1);
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}
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/* Handle awkward all-on-same-line case as its own thing */
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if (y0 == y2) {
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a = b = x0;
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if (x1 < a) {
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a = x1;
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} else if (x1 > b) {
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b = x1;
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}
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if (x2 < a) {
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a = x2;
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} else if (x2 > b) {
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b = x2;
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}
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gfx_drawFastHLine(a, y0, b - a + 1, color);
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return;
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}
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int16_t
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dx01 = x1 - x0,
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dy01 = y1 - y0,
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dx02 = x2 - x0,
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dy02 = y2 - y0,
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dx12 = x2 - x1,
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dy12 = y2 - y1,
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sa = 0,
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sb = 0;
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/* For upper part of triangle, find scanline crossings for segments
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* 0-1 and 0-2. If y1=y2 (flat-bottomed triangle), the scanline y1
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* is included here (and second loop will be skipped, avoiding a /0
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* error there), otherwise scanline y1 is skipped here and handled
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* in the second loop...which also avoids a /0 error here if y0=y1
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* (flat-topped triangle).
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*/
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if (y1 == y2) {
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last = y1; /* Include y1 scanline */
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} else {
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last = y1 - 1; /* Skip it */
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}
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for (y = y0; y <= last; y++) {
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a = x0 + sa / dy01;
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b = x0 + sb / dy02;
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sa += dx01;
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sb += dx02;
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/* longhand:
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a = x0 + (x1 - x0) * (y - y0) / (y1 - y0);
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b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
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*/
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if (a > b) {
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swap(a, b);
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}
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gfx_drawFastHLine(a, y, b - a + 1, color);
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}
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/* For lower part of triangle, find scanline crossings for segments
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* 0-2 and 1-2. This loop is skipped if y1=y2.
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*/
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sa = dx12 * (y - y1);
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sb = dx02 * (y - y0);
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for (; y <= y2; y++) {
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a = x1 + sa / dy12;
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b = x0 + sb / dy02;
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sa += dx12;
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sb += dx02;
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/* longhand:
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a = x1 + (x2 - x1) * (y - y1) / (y2 - y1);
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b = x0 + (x2 - x0) * (y - y0) / (y2 - y0);
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*/
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if (a > b) {
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swap(a, b);
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}
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gfx_drawFastHLine(a, y, b - a + 1, color);
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}
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}
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void gfx_drawBitmap(int16_t x, int16_t y,
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const uint8_t *bitmap, int16_t w, int16_t h,
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uint16_t color)
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{
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int16_t i, j, byteWidth = (w + 7) / 8;
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for (j = 0; j < h; j++) {
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for (i = 0; i < w; i++) {
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if (pgm_read_byte(bitmap + j * byteWidth + i / 8) &
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(128 >> (i & 7))) {
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gfx_drawPixel(x + i, y + j, color);
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}
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}
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}
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}
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void gfx_write(uint8_t c)
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{
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if (c == '\n') {
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__gfx_state.cursor_y += __gfx_state.textsize * 12;
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__gfx_state.cursor_x = 0;
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} else if (c == '\r') {
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/* skip em */
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} else {
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gfx_drawChar(__gfx_state.cursor_x, __gfx_state.cursor_y,
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c, __gfx_state.textcolor, __gfx_state.textbgcolor,
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__gfx_state.textsize);
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__gfx_state.cursor_x += __gfx_state.textsize * 8;
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if (__gfx_state.wrap &&
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(__gfx_state.cursor_x > (__gfx_state._width -
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__gfx_state.textsize*8))) {
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__gfx_state.cursor_y += __gfx_state.textsize * 12;
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__gfx_state.cursor_x = 0;
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}
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}
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}
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void gfx_puts(char *s)
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{
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while (*s) {
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gfx_write(*s);
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s++;
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}
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}
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/* Draw a character */
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void gfx_drawChar(int16_t x, int16_t y, unsigned char c,
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uint16_t color, uint16_t bg, uint8_t size)
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{
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int8_t i, j, line;
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int8_t descender;
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unsigned const char *glyph;
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glyph = &mcm_font[(c & 0x7f) * 9];
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descender = (*glyph & 0x80) != 0;
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for (i = 0; i < 12; i++) {
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line = 0x00;
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if (descender) {
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if (i > 2) {
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line = *(glyph + (i - 3));
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}
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} else {
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if (i < 9) {
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line = *(glyph + i);
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}
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}
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line &= 0x7f;
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for (j = 0; j < 8; j++) {
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if (line & 0x80) {
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if (size == 1) /* default size */
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gfx_drawPixel(x+j, y+i, color);
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else { /* big size */
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gfx_fillRect(x+(j*size), y+(i*size),
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size, size, color);
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}
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} else if (bg != color) {
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if (size == 1) /* default size */
|
|
gfx_drawPixel(x+j, y+i, bg);
|
|
else { /* big size */
|
|
gfx_fillRect(x+j*size, y+i*size,
|
|
size, size, bg);
|
|
}
|
|
}
|
|
line <<= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
void gfx_setCursor(int16_t x, int16_t y)
|
|
{
|
|
__gfx_state.cursor_x = x;
|
|
__gfx_state.cursor_y = y;
|
|
}
|
|
|
|
void gfx_setTextSize(uint8_t s)
|
|
{
|
|
__gfx_state.textsize = (s > 0) ? s : 1;
|
|
}
|
|
|
|
void gfx_setTextColor(uint16_t c, uint16_t b)
|
|
{
|
|
__gfx_state.textcolor = c;
|
|
__gfx_state.textbgcolor = b;
|
|
}
|
|
|
|
void gfx_setTextWrap(uint8_t w)
|
|
{
|
|
__gfx_state.wrap = w;
|
|
}
|
|
|
|
uint8_t gfx_getRotation(void)
|
|
{
|
|
return __gfx_state.rotation;
|
|
}
|
|
|
|
void gfx_setRotation(uint8_t x)
|
|
{
|
|
__gfx_state.rotation = (x & 3);
|
|
switch (__gfx_state.rotation) {
|
|
case 0:
|
|
case 2:
|
|
__gfx_state._width = GFX_WIDTH;
|
|
__gfx_state._height = GFX_HEIGHT;
|
|
break;
|
|
case 1:
|
|
case 3:
|
|
__gfx_state._width = GFX_HEIGHT;
|
|
__gfx_state._height = GFX_WIDTH;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Return the size of the display (per current rotation) */
|
|
uint16_t gfx_width(void)
|
|
{
|
|
return __gfx_state._width;
|
|
}
|
|
|
|
uint16_t gfx_height(void)
|
|
{
|
|
return __gfx_state._height;
|
|
}
|
|
|