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Hacked version of AdaFruit graphics library for SSD1306 usage on I2C
Adafruit_GFX.cpp
- Committer:
- eggsylah
- Date:
- 2017-06-15
- Revision:
- 0:b0151666c710
File content as of revision 0:b0151666c710:
/* This is the core graphics library for all our displays, providing a common set of graphics primitives (points, lines, circles, etc.). It needs to be paired with a hardware-specific library for each display device we carry (to handle the lower-level functions). Adafruit invests time and resources providing this open source code, please support Adafruit & open-source hardware by purchasing products from Adafruit! Copyright (c) 2013 Adafruit Industries. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "Adafruit_GFX.h" #include "glcdfont.c" // Many (but maybe not all) non-AVR board installs define macros // for compatibility with existing PROGMEM-reading AVR code. // Do our own checks and defines here for good measure... #ifndef pgm_read_byte #define pgm_read_byte(addr) (*(const unsigned char *)(addr)) #endif #ifndef pgm_read_word #define pgm_read_word(addr) (*(const unsigned short *)(addr)) #endif #ifndef pgm_read_dword #define pgm_read_dword(addr) (*(const unsigned long *)(addr)) #endif // Pointers are a peculiar case...typically 16-bit on AVR boards, // 32 bits elsewhere. Try to accommodate both... #if !defined(__INT_MAX__) || (__INT_MAX__ > 0xFFFF) #define pgm_read_pointer(addr) ((void *)pgm_read_dword(addr)) #else #define pgm_read_pointer(addr) ((void *)pgm_read_word(addr)) #endif #ifndef min #define min(a,b) (((a) < (b)) ? (a) : (b)) #endif #ifndef _swap_int16_t #define _swap_int16_t(a, b) { int16_t t = a; a = b; b = t; } #endif Adafruit_GFX::Adafruit_GFX(int16_t w, int16_t h): WIDTH(w), HEIGHT(h) { _width = WIDTH; _height = HEIGHT; rotation = 0; cursor_y = cursor_x = 0; textsize = 1; textcolor = textbgcolor = 0xFFFF; wrap = true; gfxFont = NULL; } // Draw a circle outline void Adafruit_GFX::drawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color) { int16_t f = 1 - r; int16_t ddF_x = 1; int16_t ddF_y = -2 * r; int16_t x = 0; int16_t y = r; drawPixel(x0 , y0+r, color); drawPixel(x0 , y0-r, color); drawPixel(x0+r, y0 , color); drawPixel(x0-r, y0 , color); while (x<y) { if (f >= 0) { y--; ddF_y += 2; f += ddF_y; } x++; ddF_x += 2; f += ddF_x; drawPixel(x0 + x, y0 + y, color); drawPixel(x0 - x, y0 + y, color); drawPixel(x0 + x, y0 - y, color); drawPixel(x0 - x, y0 - y, color); drawPixel(x0 + y, y0 + x, color); drawPixel(x0 - y, y0 + x, color); drawPixel(x0 + y, y0 - x, color); drawPixel(x0 - y, y0 - x, color); } } void Adafruit_GFX::drawCircleHelper( int16_t x0, int16_t y0, int16_t r, uint8_t cornername, uint16_t color) { int16_t f = 1 - r; int16_t ddF_x = 1; int16_t ddF_y = -2 * r; int16_t x = 0; int16_t y = r; while (x<y) { if (f >= 0) { y--; ddF_y += 2; f += ddF_y; } x++; ddF_x += 2; f += ddF_x; if (cornername & 0x4) { drawPixel(x0 + x, y0 + y, color); drawPixel(x0 + y, y0 + x, color); } if (cornername & 0x2) { drawPixel(x0 + x, y0 - y, color); drawPixel(x0 + y, y0 - x, color); } if (cornername & 0x8) { drawPixel(x0 - y, y0 + x, color); drawPixel(x0 - x, y0 + y, color); } if (cornername & 0x1) { drawPixel(x0 - y, y0 - x, color); drawPixel(x0 - x, y0 - y, color); } } } void Adafruit_GFX::fillCircle(int16_t x0, int16_t y0, int16_t r, uint16_t color) { drawFastVLine(x0, y0-r, 2*r+1, color); fillCircleHelper(x0, y0, r, 3, 0, color); } // Used to do circles and roundrects void Adafruit_GFX::fillCircleHelper(int16_t x0, int16_t y0, int16_t r, uint8_t cornername, int16_t delta, uint16_t color) { int16_t f = 1 - r; int16_t ddF_x = 1; int16_t ddF_y = -2 * r; int16_t x = 0; int16_t 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) { drawFastVLine(x0+x, y0-y, 2*y+1+delta, color); drawFastVLine(x0+y, y0-x, 2*x+1+delta, color); } if (cornername & 0x2) { drawFastVLine(x0-x, y0-y, 2*y+1+delta, color); drawFastVLine(x0-y, y0-x, 2*x+1+delta, color); } } } // Bresenham's algorithm - thx wikpedia void Adafruit_GFX::drawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color) { int16_t steep = abs(y1 - y0) > abs(x1 - x0); if (steep) { _swap_int16_t(x0, y0); _swap_int16_t(x1, y1); } if (x0 > x1) { _swap_int16_t(x0, x1); _swap_int16_t(y0, y1); } int16_t dx, dy; dx = x1 - x0; dy = abs(y1 - y0); int16_t err = dx / 2; int16_t ystep; if (y0 < y1) { ystep = 1; } else { ystep = -1; } for (; x0<=x1; x0++) { if (steep) { drawPixel(y0, x0, color); } else { drawPixel(x0, y0, color); } err -= dy; if (err < 0) { y0 += ystep; err += dx; } } } // Draw a rectangle void Adafruit_GFX::drawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color) { drawFastHLine(x, y, w, color); drawFastHLine(x, y+h-1, w, color); drawFastVLine(x, y, h, color); drawFastVLine(x+w-1, y, h, color); } void Adafruit_GFX::drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color) { // Update in subclasses if desired! drawLine(x, y, x, y+h-1, color); } void Adafruit_GFX::drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color) { // Update in subclasses if desired! drawLine(x, y, x+w-1, y, color); } void Adafruit_GFX::fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color) { // Update in subclasses if desired! for (int16_t i=x; i<x+w; i++) { drawFastVLine(i, y, h, color); } } void Adafruit_GFX::fillScreen(uint16_t color) { fillRect(0, 0, _width, _height, color); } // Draw a rounded rectangle void Adafruit_GFX::drawRoundRect(int16_t x, int16_t y, int16_t w, int16_t h, int16_t r, uint16_t color) { // smarter version drawFastHLine(x+r , y , w-2*r, color); // Top drawFastHLine(x+r , y+h-1, w-2*r, color); // Bottom drawFastVLine(x , y+r , h-2*r, color); // Left drawFastVLine(x+w-1, y+r , h-2*r, color); // Right // draw four corners drawCircleHelper(x+r , y+r , r, 1, color); drawCircleHelper(x+w-r-1, y+r , r, 2, color); drawCircleHelper(x+w-r-1, y+h-r-1, r, 4, color); drawCircleHelper(x+r , y+h-r-1, r, 8, color); } // Fill a rounded rectangle void Adafruit_GFX::fillRoundRect(int16_t x, int16_t y, int16_t w, int16_t h, int16_t r, uint16_t color) { // smarter version fillRect(x+r, y, w-2*r, h, color); // draw four corners fillCircleHelper(x+w-r-1, y+r, r, 1, h-2*r-1, color); fillCircleHelper(x+r , y+r, r, 2, h-2*r-1, color); } // Draw a triangle void Adafruit_GFX::drawTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color) { drawLine(x0, y0, x1, y1, color); drawLine(x1, y1, x2, y2, color); drawLine(x2, y2, x0, y0, color); } // Fill a triangle void Adafruit_GFX::fillTriangle(int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color) { int16_t a, b, y, last; // Sort coordinates by Y order (y2 >= y1 >= y0) if (y0 > y1) { _swap_int16_t(y0, y1); _swap_int16_t(x0, x1); } if (y1 > y2) { _swap_int16_t(y2, y1); _swap_int16_t(x2, x1); } if (y0 > y1) { _swap_int16_t(y0, y1); _swap_int16_t(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; drawFastHLine(a, y0, b-a+1, color); return; } int16_t dx01 = x1 - x0, dy01 = y1 - y0, dx02 = x2 - x0, dy02 = y2 - y0, dx12 = x2 - x1, dy12 = y2 - y1; int32_t sa = 0, sb = 0; // 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) _swap_int16_t(a,b); 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) _swap_int16_t(a,b); drawFastHLine(a, y, b-a+1, color); } } // Draw a 1-bit image (bitmap) at the specified (x,y) position from the // provided bitmap buffer using the specified // foreground color (unset bits are transparent). void Adafruit_GFX::drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) { int16_t i, j, byteWidth = (w + 7) / 8; uint8_t byte; for(j=0; j<h; j++) { for(i=0; i<w; i++ ) { if(i & 7) byte <<= 1; else byte = bitmap[j * byteWidth + i / 8]; if(byte & 0x80) drawPixel(x+i, y+j, color); } } } // Draw a 1-bit image (bitmap) at the specified (x,y) position from the // provided bitmap buffer using the specified // foreground (for set bits) and background (for clear bits) colors. void Adafruit_GFX::drawBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color, uint16_t bg) { int16_t i, j, byteWidth = (w + 7) / 8; uint8_t byte; for(j=0; j<h; j++) { for(i=0; i<w; i++ ) { if(i & 7) byte <<= 1; else byte = bitmap[j * byteWidth + i / 8]; if(byte & 0x80) drawPixel(x+i, y+j, color); else drawPixel(x+i, y+j, bg); } } } //Draw XBitMap Files (*.xbm), exported from GIMP, //Usage: Export from GIMP to *.xbm, rename *.xbm to *.c and open in editor. //C Array can be directly used with this function void Adafruit_GFX::drawXBitmap(int16_t x, int16_t y, const uint8_t *bitmap, int16_t w, int16_t h, uint16_t color) { int16_t i, j, byteWidth = (w + 7) / 8; uint8_t byte; for(j=0; j<h; j++) { for(i=0; i<w; i++ ) { if(i & 7) byte >>= 1; else byte = pgm_read_byte(bitmap + j * byteWidth + i / 8); if(byte & 0x01) drawPixel(x+i, y+j, color); } } } size_t Adafruit_GFX::write(uint8_t c) { if(!gfxFont) { // 'Classic' built-in font if(c == '\n') { cursor_y += textsize*8; cursor_x = 0; } else if(c == '\r') { // skip em } else { if(wrap && ((cursor_x + textsize * 6) >= _width)) { // Heading off edge? cursor_x = 0; // Reset x to zero cursor_y += textsize * 8; // Advance y one line } drawChar(cursor_x, cursor_y, c, textcolor, textbgcolor, textsize); cursor_x += textsize * 6; } } else { // Custom font if(c == '\n') { cursor_x = 0; cursor_y += (int16_t)textsize * (uint8_t)pgm_read_byte(&gfxFont->yAdvance); } else if(c != '\r') { uint8_t first = pgm_read_byte(&gfxFont->first); if((c >= first) && (c <= (uint8_t)pgm_read_byte(&gfxFont->last))) { uint8_t c2 = c - pgm_read_byte(&gfxFont->first); GFXglyph *glyph = &(((GFXglyph *)pgm_read_pointer(&gfxFont->glyph))[c2]); uint8_t w = pgm_read_byte(&glyph->width), h = pgm_read_byte(&glyph->height); if((w > 0) && (h > 0)) { // Is there an associated bitmap? int16_t xo = (int8_t)pgm_read_byte(&glyph->xOffset); // sic if(wrap && ((cursor_x + textsize * (xo + w)) >= _width)) { // Drawing character would go off right edge; wrap to new line cursor_x = 0; cursor_y += (int16_t)textsize * (uint8_t)pgm_read_byte(&gfxFont->yAdvance); } drawChar(cursor_x, cursor_y, c, textcolor, textbgcolor, textsize); } cursor_x += pgm_read_byte(&glyph->xAdvance) * (int16_t)textsize; } } } return 1; } // Draw a character void Adafruit_GFX::drawChar(int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg, uint8_t size) { if(!gfxFont) { // 'Classic' built-in font if((x >= _width) || // Clip right (y >= _height) || // Clip bottom ((x + 6 * size - 1) < 0) || // Clip left ((y + 8 * size - 1) < 0)) // Clip top return; for(int8_t i=0; i<6; i++ ) { uint8_t line; if(i < 5) line = pgm_read_byte(font+(c*5)+i); else line = 0x0; for(int8_t j=0; j<8; j++, line >>= 1) { if(line & 0x1) { if(size == 1) drawPixel(x+i, y+j, color); else fillRect(x+(i*size), y+(j*size), size, size, color); } else if(bg != color) { if(size == 1) drawPixel(x+i, y+j, bg); else fillRect(x+i*size, y+j*size, size, size, bg); } } } } else { // Custom font // Character is assumed previously filtered by write() to eliminate // newlines, returns, non-printable characters, etc. Calling drawChar() // directly with 'bad' characters of font may cause mayhem! c -= pgm_read_byte(&gfxFont->first); GFXglyph *glyph = &(((GFXglyph *)pgm_read_pointer(&gfxFont->glyph))[c]); uint8_t *bitmap = (uint8_t *)pgm_read_pointer(&gfxFont->bitmap); uint16_t bo = pgm_read_word(&glyph->bitmapOffset); uint8_t w = pgm_read_byte(&glyph->width), h = pgm_read_byte(&glyph->height), xa = pgm_read_byte(&glyph->xAdvance); int8_t xo = pgm_read_byte(&glyph->xOffset); int8_t yo = pgm_read_byte(&glyph->yOffset); uint8_t xx, yy, bits, bit = 0; int16_t xo16, yo16; if(size > 1) { xo16 = xo; yo16 = yo; } // Todo: Add character clipping here // NOTE: THERE IS NO 'BACKGROUND' COLOR OPTION ON CUSTOM FONTS. // THIS IS ON PURPOSE AND BY DESIGN. The background color feature // has typically been used with the 'classic' font to overwrite old // screen contents with new data. This ONLY works because the // characters are a uniform size; it's not a sensible thing to do with // proportionally-spaced fonts with glyphs of varying sizes (and that // may overlap). To replace previously-drawn text when using a custom // font, use the getTextBounds() function to determine the smallest // rectangle encompassing a string, erase the area with fillRect(), // then draw new text. This WILL infortunately 'blink' the text, but // is unavoidable. Drawing 'background' pixels will NOT fix this, // only creates a new set of problems. Have an idea to work around // this (a canvas object type for MCUs that can afford the RAM and // displays supporting setAddrWindow() and pushColors()), but haven't // implemented this yet. for(yy=0; yy<h; yy++) { for(xx=0; xx<w; xx++) { if(!(bit++ & 7)) { bits = pgm_read_byte(&bitmap[bo++]); } if(bits & 0x80) { if(size == 1) { drawPixel(x+xo+xx, y+yo+yy, color); } else { fillRect(x+(xo16+xx)*size, y+(yo16+yy)*size, size, size, color); } } bits <<= 1; } } } // End classic vs custom font } void Adafruit_GFX::setCursor(int16_t x, int16_t y) { cursor_x = x; cursor_y = y; } int16_t Adafruit_GFX::getCursorX(void) const { return cursor_x; } int16_t Adafruit_GFX::getCursorY(void) const { return cursor_y; } void Adafruit_GFX::setTextSize(uint8_t s) { textsize = (s > 0) ? s : 1; } void Adafruit_GFX::setTextColor(uint16_t c) { // For 'transparent' background, we'll set the bg // to the same as fg instead of using a flag textcolor = textbgcolor = c; } void Adafruit_GFX::setTextColor(uint16_t c, uint16_t b) { textcolor = c; textbgcolor = b; } void Adafruit_GFX::setTextWrap(bool w) { wrap = w; } uint8_t Adafruit_GFX::getRotation(void) const { return rotation; } void Adafruit_GFX::setRotation(uint8_t x) { rotation = (x & 3); switch(rotation) { case 0: case 2: _width = WIDTH; _height = HEIGHT; break; case 1: case 3: _width = HEIGHT; _height = WIDTH; break; } } void Adafruit_GFX::setFont(const GFXfont *f) { if(f) { // Font struct pointer passed in? if(!gfxFont) { // And no current font struct? // Switching from classic to new font behavior. // Move cursor pos down 6 pixels so it's on baseline. cursor_y += 6; } } else if(gfxFont) { // NULL passed. Current font struct defined? // Switching from new to classic font behavior. // Move cursor pos up 6 pixels so it's at top-left of char. cursor_y -= 6; } gfxFont = (GFXfont *)f; } // Pass string and a cursor position, returns UL corner and W,H. void Adafruit_GFX::getTextBounds(char *str, int16_t x, int16_t y, int16_t *x1, int16_t *y1, uint16_t *w, uint16_t *h) { uint8_t c; // Current character *x1 = x; *y1 = y; *w = *h = 0; if(gfxFont) { GFXglyph *glyph; uint8_t first = pgm_read_byte(&gfxFont->first), last = pgm_read_byte(&gfxFont->last), gw, gh, xa; int8_t xo, yo; int16_t minx = _width, miny = _height, maxx = -1, maxy = -1, gx1, gy1, gx2, gy2, ts = (int16_t)textsize, ya = ts * (uint8_t)pgm_read_byte(&gfxFont->yAdvance); while((c = *str++)) { if(c != '\n') { // Not a newline if(c != '\r') { // Not a carriage return, is normal char if((c >= first) && (c <= last)) { // Char present in current font c -= first; glyph = &(((GFXglyph *)pgm_read_pointer(&gfxFont->glyph))[c]); gw = pgm_read_byte(&glyph->width); gh = pgm_read_byte(&glyph->height); xa = pgm_read_byte(&glyph->xAdvance); xo = pgm_read_byte(&glyph->xOffset); yo = pgm_read_byte(&glyph->yOffset); if(wrap && ((x + (((int16_t)xo + gw) * ts)) >= _width)) { // Line wrap x = 0; // Reset x to 0 y += ya; // Advance y by 1 line } gx1 = x + xo * ts; gy1 = y + yo * ts; gx2 = gx1 + gw * ts - 1; gy2 = gy1 + gh * ts - 1; if(gx1 < minx) minx = gx1; if(gy1 < miny) miny = gy1; if(gx2 > maxx) maxx = gx2; if(gy2 > maxy) maxy = gy2; x += xa * ts; } } // Carriage return = do nothing } else { // Newline x = 0; // Reset x y += ya; // Advance y by 1 line } } // End of string *x1 = minx; *y1 = miny; if(maxx >= minx) *w = maxx - minx + 1; if(maxy >= miny) *h = maxy - miny + 1; } else { // Default font uint16_t lineWidth = 0, maxWidth = 0; // Width of current, all lines while((c = *str++)) { if(c != '\n') { // Not a newline if(c != '\r') { // Not a carriage return, is normal char if(wrap && ((x + textsize * 6) >= _width)) { x = 0; // Reset x to 0 y += textsize * 8; // Advance y by 1 line if(lineWidth > maxWidth) maxWidth = lineWidth; // Save widest line lineWidth = textsize * 6; // First char on new line } else { // No line wrap, just keep incrementing X lineWidth += textsize * 6; // Includes interchar x gap } } // Carriage return = do nothing } else { // Newline x = 0; // Reset x to 0 y += textsize * 8; // Advance y by 1 line if(lineWidth > maxWidth) maxWidth = lineWidth; // Save widest line lineWidth = 0; // Reset lineWidth for new line } } // End of string if(lineWidth) y += textsize * 8; // Add height of last (or only) line if(lineWidth > maxWidth) maxWidth = lineWidth; // Is the last or only line the widest? *w = maxWidth - 1; // Don't include last interchar x gap *h = y - *y1; } // End classic vs custom font } void Adafruit_GFX::print(const char* str) { const char* p = str; while (*p!=0) write(*p++); } void Adafruit_GFX::println(const char* str) { print(str); write('\n'); } // Return the size of the display (per current rotation) int16_t Adafruit_GFX::width(void) const { return _width; } int16_t Adafruit_GFX::height(void) const { return _height; } void Adafruit_GFX::invertDisplay(bool i) { // Do nothing, must be subclassed if supported by hardware } /***************************************************************************/