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- /*
- u8x8_8x8.c
-
- font procedures, directly interfaces display procedures
-
- Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
- Copyright (c) 2016, olikraus@gmail.com
- 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 "u8x8.h"
- #if defined(ESP8266)
- uint8_t u8x8_pgm_read_esp(const uint8_t * addr)
- {
- uint32_t bytes;
- bytes = *(uint32_t*)((uint32_t)addr & ~3);
- return ((uint8_t*)&bytes)[(uint32_t)addr & 3];
- }
- #endif
- void u8x8_SetFont(u8x8_t *u8x8, const uint8_t *font_8x8)
- {
- u8x8->font = font_8x8;
- }
- /*
- Args:
- u8x8: ptr to u8x8 structure
- encoding: glyph for which the data is requested (must be between 0 and 255)
- buf: pointer to 8 bytes
- */
- static void u8x8_get_glyph_data(u8x8_t *u8x8, uint8_t encoding, uint8_t *buf, uint8_t tile_offset) U8X8_NOINLINE;
- static void u8x8_get_glyph_data(u8x8_t *u8x8, uint8_t encoding, uint8_t *buf, uint8_t tile_offset)
- {
- uint8_t first, last, tiles, i;
- uint16_t offset;
- first = u8x8_pgm_read(u8x8->font+0);
- last = u8x8_pgm_read(u8x8->font+1);
- tiles = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
- tiles *= u8x8_pgm_read(u8x8->font+3); /* new 2019 format */
-
- /* get the glyph bitmap from the font */
- if ( first <= encoding && encoding <= last )
- {
- offset = encoding;
- offset -= first;
- offset *= tiles; /* new 2019 format */
- offset += tile_offset; /* new 2019 format */
- offset *= 8;
- offset +=4; /* changed from 2 to 4, new 2019 format */
- for( i = 0; i < 8; i++ )
- {
- buf[i] = u8x8_pgm_read(u8x8->font+offset);
- offset++;
- }
- }
- else
- {
- for( i = 0; i < 8; i++ )
- {
- buf[i] = 0;
- }
- }
-
- /* invert the bitmap if required */
- if ( u8x8->is_font_inverse_mode )
- {
- for( i = 0; i < 8; i++ )
- {
- buf[i] ^= 255;
- }
- }
-
- }
- void u8x8_DrawGlyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
- {
- uint8_t th = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
- uint8_t tv = u8x8_pgm_read(u8x8->font+3); /* new 2019 format */
- uint8_t xx, tile;
- uint8_t buf[8];
- th += x;
- tv += y;
- tile = 0;
- do
- {
- xx = x;
- do
- {
- u8x8_get_glyph_data(u8x8, encoding, buf, tile);
- u8x8_DrawTile(u8x8, xx, y, 1, buf);
- tile++;
- xx++;
- } while( xx < th );
- y++;
- } while( y < tv );
- }
- /*
- Source: http://graphics.stanford.edu/~seander/bithacks.html
- Section: Interleave bits by Binary Magic Numbers
- Original codes is here:
- static const unsigned int B[] = {0x55555555, 0x33333333, 0x0F0F0F0F, 0x00FF00FF};
- static const unsigned int S[] = {1, 2, 4, 8};
- unsigned int x; // Interleave lower 16 bits of x and y, so the bits of x
- unsigned int y; // are in the even positions and bits from y in the odd;
- unsigned int z; // z gets the resulting 32-bit Morton Number.
- // x and y must initially be less than 65536.
- x = (x | (x << S[3])) & B[3];
- x = (x | (x << S[2])) & B[2];
- x = (x | (x << S[1])) & B[1];
- x = (x | (x << S[0])) & B[0];
- y = (y | (y << S[3])) & B[3];
- y = (y | (y << S[2])) & B[2];
- y = (y | (y << S[1])) & B[1];
- y = (y | (y << S[0])) & B[0];
- z = x | (y << 1);
- */
- uint16_t u8x8_upscale_byte(uint8_t x)
- {
- uint16_t y = x;
- y |= (y << 4); // x = (x | (x << S[2])) & B[2];
- y &= 0x0f0f;
- y |= (y << 2); // x = (x | (x << S[1])) & B[1];
- y &= 0x3333;
- y |= (y << 1); // x = (x | (x << S[0])) & B[0];
- y &= 0x5555;
-
- y |= (y << 1); // z = x | (y << 1);
- return y;
- }
- static void u8x8_upscale_buf(uint8_t *src, uint8_t *dest) U8X8_NOINLINE;
- static void u8x8_upscale_buf(uint8_t *src, uint8_t *dest)
- {
- uint8_t i = 4;
- do
- {
- *dest++ = *src;
- *dest++ = *src++;
- i--;
- } while( i > 0 );
- }
- static void u8x8_draw_2x2_subglyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding, uint8_t tile)
- {
- uint8_t i;
- uint16_t t;
- uint8_t buf[8];
- uint8_t buf1[8];
- uint8_t buf2[8];
- u8x8_get_glyph_data(u8x8, encoding, buf, tile);
- for( i = 0; i < 8; i ++ )
- {
- t = u8x8_upscale_byte(buf[i]);
- buf1[i] = t >> 8;
- buf2[i] = t & 255;
- }
- u8x8_upscale_buf(buf2, buf);
- u8x8_DrawTile(u8x8, x, y, 1, buf);
-
- u8x8_upscale_buf(buf2+4, buf);
- u8x8_DrawTile(u8x8, x+1, y, 1, buf);
-
- u8x8_upscale_buf(buf1, buf);
- u8x8_DrawTile(u8x8, x, y+1, 1, buf);
-
- u8x8_upscale_buf(buf1+4, buf);
- u8x8_DrawTile(u8x8, x+1, y+1, 1, buf);
- }
- void u8x8_Draw2x2Glyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
- {
- uint8_t th = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
- uint8_t tv = u8x8_pgm_read(u8x8->font+3); /* new 2019 format */
- uint8_t xx, tile;
- th *= 2;
- th += x;
- tv *= 2;
- tv += y;
- tile = 0;
- do
- {
- xx = x;
- do
- {
- u8x8_draw_2x2_subglyph(u8x8, xx, y, encoding, tile);
- tile++;
- xx+=2;
- } while( xx < th );
- y+=2;
- } while( y < tv );
- }
- /* https://github.com/olikraus/u8g2/issues/474 */
- static void u8x8_draw_1x2_subglyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding, uint8_t tile)
- {
- uint8_t i;
- uint16_t t;
- uint8_t buf[8];
- uint8_t buf1[8];
- uint8_t buf2[8];
- u8x8_get_glyph_data(u8x8, encoding, buf, tile);
- for( i = 0; i < 8; i ++ )
- {
- t = u8x8_upscale_byte(buf[i]);
- buf1[i] = t >> 8;
- buf2[i] = t & 255;
- }
- u8x8_DrawTile(u8x8, x, y, 1, buf2);
- u8x8_DrawTile(u8x8, x, y+1, 1, buf1);
- }
- void u8x8_Draw1x2Glyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
- {
- uint8_t th = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
- uint8_t tv = u8x8_pgm_read(u8x8->font+3); /* new 2019 format */
- uint8_t xx, tile;
- th += x;
- tv *= 2;
- tv += y;
- tile = 0;
- do
- {
- xx = x;
- do
- {
- u8x8_draw_1x2_subglyph(u8x8, xx, y, encoding, tile);
- tile++;
- xx++;
- } while( xx < th );
- y+=2;
- } while( y < tv );
- }
- /*
- source: https://en.wikipedia.org/wiki/UTF-8
- Bits from to bytes Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6
- 7 U+0000 U+007F 1 0xxxxxxx
- 11 U+0080 U+07FF 2 110xxxxx 10xxxxxx
- 16 U+0800 U+FFFF 3 1110xxxx 10xxxxxx 10xxxxxx
- 21 U+10000 U+1FFFFF 4 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- 26 U+200000 U+3FFFFFF 5 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- 31 U+4000000 U+7FFFFFFF 6 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- */
- /* reset the internal state machine */
- void u8x8_utf8_init(u8x8_t *u8x8)
- {
- u8x8->utf8_state = 0; /* also reset during u8x8_SetupDefaults() */
- }
- uint16_t u8x8_ascii_next(U8X8_UNUSED u8x8_t *u8x8, uint8_t b)
- {
- if ( b == 0 || b == '\n' ) /* '\n' terminates the string to support the string list procedures */
- return 0x0ffff; /* end of string detected*/
- return b;
- }
- /*
- pass a byte from an utf8 encoded string to the utf8 decoder state machine
- returns
- 0x0fffe: no glyph, just continue
- 0x0ffff: end of string
- anything else: The decoded encoding
- */
- uint16_t u8x8_utf8_next(u8x8_t *u8x8, uint8_t b)
- {
- if ( b == 0 || b == '\n' ) /* '\n' terminates the string to support the string list procedures */
- return 0x0ffff; /* end of string detected, pending UTF8 is discarded */
- if ( u8x8->utf8_state == 0 )
- {
- if ( b >= 0xfc ) /* 6 byte sequence */
- {
- u8x8->utf8_state = 5;
- b &= 1;
- }
- else if ( b >= 0xf8 )
- {
- u8x8->utf8_state = 4;
- b &= 3;
- }
- else if ( b >= 0xf0 )
- {
- u8x8->utf8_state = 3;
- b &= 7;
- }
- else if ( b >= 0xe0 )
- {
- u8x8->utf8_state = 2;
- b &= 15;
- }
- else if ( b >= 0xc0 )
- {
- u8x8->utf8_state = 1;
- b &= 0x01f;
- }
- else
- {
- /* do nothing, just use the value as encoding */
- return b;
- }
- u8x8->encoding = b;
- return 0x0fffe;
- }
- else
- {
- u8x8->utf8_state--;
- /* The case b < 0x080 (an illegal UTF8 encoding) is not checked here. */
- u8x8->encoding<<=6;
- b &= 0x03f;
- u8x8->encoding |= b;
- if ( u8x8->utf8_state != 0 )
- return 0x0fffe; /* nothing to do yet */
- }
- return u8x8->encoding;
- }
- static uint8_t u8x8_draw_string(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s) U8X8_NOINLINE;
- static uint8_t u8x8_draw_string(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- uint16_t e;
- uint8_t cnt = 0;
- uint8_t th = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
- u8x8_utf8_init(u8x8);
- for(;;)
- {
- e = u8x8->next_cb(u8x8, (uint8_t)*s);
- if ( e == 0x0ffff )
- break;
- s++;
- if ( e != 0x0fffe )
- {
- u8x8_DrawGlyph(u8x8, x, y, e);
- x+=th;
- cnt++;
- }
- }
- return cnt;
- }
- uint8_t u8x8_DrawString(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- u8x8->next_cb = u8x8_ascii_next;
- return u8x8_draw_string(u8x8, x, y, s);
- }
- uint8_t u8x8_DrawUTF8(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- u8x8->next_cb = u8x8_utf8_next;
- return u8x8_draw_string(u8x8, x, y, s);
- }
- static uint8_t u8x8_draw_2x2_string(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s) U8X8_NOINLINE;
- static uint8_t u8x8_draw_2x2_string(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- uint16_t e;
- uint8_t cnt = 0;
- uint8_t th = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
-
- th <<= 1;
-
- u8x8_utf8_init(u8x8);
- for(;;)
- {
- e = u8x8->next_cb(u8x8, (uint8_t)*s);
- if ( e == 0x0ffff )
- break;
- s++;
- if ( e != 0x0fffe )
- {
- u8x8_Draw2x2Glyph(u8x8, x, y, e);
- x+=th;
- cnt++;
- }
- }
- return cnt;
- }
- uint8_t u8x8_Draw2x2String(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- u8x8->next_cb = u8x8_ascii_next;
- return u8x8_draw_2x2_string(u8x8, x, y, s);
- }
- uint8_t u8x8_Draw2x2UTF8(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- u8x8->next_cb = u8x8_utf8_next;
- return u8x8_draw_2x2_string(u8x8, x, y, s);
- }
- static uint8_t u8x8_draw_1x2_string(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s) U8X8_NOINLINE;
- static uint8_t u8x8_draw_1x2_string(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- uint16_t e;
- uint8_t cnt = 0;
- uint8_t th = u8x8_pgm_read(u8x8->font+2); /* new 2019 format */
- u8x8_utf8_init(u8x8);
- for(;;)
- {
- e = u8x8->next_cb(u8x8, (uint8_t)*s);
- if ( e == 0x0ffff )
- break;
- s++;
- if ( e != 0x0fffe )
- {
- u8x8_Draw1x2Glyph(u8x8, x, y, e);
- x+=th;
- cnt++;
- }
- }
- return cnt;
- }
- uint8_t u8x8_Draw1x2String(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- u8x8->next_cb = u8x8_ascii_next;
- return u8x8_draw_1x2_string(u8x8, x, y, s);
- }
- uint8_t u8x8_Draw1x2UTF8(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
- {
- u8x8->next_cb = u8x8_utf8_next;
- return u8x8_draw_1x2_string(u8x8, x, y, s);
- }
- uint8_t u8x8_GetUTF8Len(u8x8_t *u8x8, const char *s)
- {
- uint16_t e;
- uint8_t cnt = 0;
- u8x8_utf8_init(u8x8);
- for(;;)
- {
- e = u8x8_utf8_next(u8x8, *s);
- if ( e == 0x0ffff )
- break;
- s++;
- if ( e != 0x0fffe )
- cnt++;
- }
- return cnt;
- }
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