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417 lines
12 KiB
C
417 lines
12 KiB
C
/*
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u8x8_8x8.c
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font procedures, directly interfaces display procedures
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2016, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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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
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "u8x8.h"
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#if defined(ESP8266)
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uint8_t u8x8_pgm_read_esp(const uint8_t* addr) {
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uint32_t bytes;
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bytes = *(uint32_t*)((uint32_t)addr & ~3);
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return ((uint8_t*)&bytes)[(uint32_t)addr & 3];
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}
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#endif
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void u8x8_SetFont(u8x8_t* u8x8, const uint8_t* font_8x8) {
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u8x8->font = font_8x8;
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}
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/*
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Args:
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u8x8: ptr to u8x8 structure
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encoding: glyph for which the data is requested (must be between 0 and 255)
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buf: pointer to 8 bytes
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*/
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static void u8x8_get_glyph_data(u8x8_t* u8x8, uint8_t encoding, uint8_t* buf, uint8_t tile_offset)
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U8X8_NOINLINE;
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static void
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u8x8_get_glyph_data(u8x8_t* u8x8, uint8_t encoding, uint8_t* buf, uint8_t tile_offset) {
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uint8_t first, last, tiles, i;
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uint16_t offset;
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first = u8x8_pgm_read(u8x8->font + 0);
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last = u8x8_pgm_read(u8x8->font + 1);
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tiles = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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tiles *= u8x8_pgm_read(u8x8->font + 3); /* new 2019 format */
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/* get the glyph bitmap from the font */
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if(first <= encoding && encoding <= last) {
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offset = encoding;
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offset -= first;
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offset *= tiles; /* new 2019 format */
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offset += tile_offset; /* new 2019 format */
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offset *= 8;
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offset += 4; /* changed from 2 to 4, new 2019 format */
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for(i = 0; i < 8; i++) {
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buf[i] = u8x8_pgm_read(u8x8->font + offset);
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offset++;
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}
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} else {
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for(i = 0; i < 8; i++) {
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buf[i] = 0;
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}
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}
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/* invert the bitmap if required */
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if(u8x8->is_font_inverse_mode) {
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for(i = 0; i < 8; i++) {
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buf[i] ^= 255;
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}
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}
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}
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void u8x8_DrawGlyph(u8x8_t* u8x8, uint8_t x, uint8_t y, uint8_t encoding) {
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uint8_t th = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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uint8_t tv = u8x8_pgm_read(u8x8->font + 3); /* new 2019 format */
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uint8_t xx, tile;
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uint8_t buf[8];
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th += x;
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tv += y;
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tile = 0;
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do {
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xx = x;
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do {
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u8x8_get_glyph_data(u8x8, encoding, buf, tile);
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u8x8_DrawTile(u8x8, xx, y, 1, buf);
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tile++;
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xx++;
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} while(xx < th);
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y++;
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} while(y < tv);
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}
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/*
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Source: http://graphics.stanford.edu/~seander/bithacks.html
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Section: Interleave bits by Binary Magic Numbers
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Original codes is here:
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static const unsigned int B[] = {0x55555555, 0x33333333, 0x0F0F0F0F, 0x00FF00FF};
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static const unsigned int S[] = {1, 2, 4, 8};
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unsigned int x; // Interleave lower 16 bits of x and y, so the bits of x
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unsigned int y; // are in the even positions and bits from y in the odd;
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unsigned int z; // z gets the resulting 32-bit Morton Number.
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// x and y must initially be less than 65536.
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x = (x | (x << S[3])) & B[3];
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x = (x | (x << S[2])) & B[2];
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x = (x | (x << S[1])) & B[1];
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x = (x | (x << S[0])) & B[0];
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y = (y | (y << S[3])) & B[3];
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y = (y | (y << S[2])) & B[2];
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y = (y | (y << S[1])) & B[1];
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y = (y | (y << S[0])) & B[0];
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z = x | (y << 1);
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*/
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uint16_t u8x8_upscale_byte(uint8_t x) {
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uint16_t y = x;
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y |= (y << 4); // x = (x | (x << S[2])) & B[2];
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y &= 0x0f0f;
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y |= (y << 2); // x = (x | (x << S[1])) & B[1];
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y &= 0x3333;
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y |= (y << 1); // x = (x | (x << S[0])) & B[0];
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y &= 0x5555;
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y |= (y << 1); // z = x | (y << 1);
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return y;
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}
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static void u8x8_upscale_buf(uint8_t* src, uint8_t* dest) U8X8_NOINLINE;
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static void u8x8_upscale_buf(uint8_t* src, uint8_t* dest) {
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uint8_t i = 4;
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do {
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*dest++ = *src;
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*dest++ = *src++;
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i--;
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} while(i > 0);
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}
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static void
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u8x8_draw_2x2_subglyph(u8x8_t* u8x8, uint8_t x, uint8_t y, uint8_t encoding, uint8_t tile) {
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uint8_t i;
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uint16_t t;
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uint8_t buf[8];
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uint8_t buf1[8];
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uint8_t buf2[8];
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u8x8_get_glyph_data(u8x8, encoding, buf, tile);
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for(i = 0; i < 8; i++) {
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t = u8x8_upscale_byte(buf[i]);
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buf1[i] = t >> 8;
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buf2[i] = t & 255;
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}
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u8x8_upscale_buf(buf2, buf);
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u8x8_DrawTile(u8x8, x, y, 1, buf);
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u8x8_upscale_buf(buf2 + 4, buf);
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u8x8_DrawTile(u8x8, x + 1, y, 1, buf);
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u8x8_upscale_buf(buf1, buf);
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u8x8_DrawTile(u8x8, x, y + 1, 1, buf);
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u8x8_upscale_buf(buf1 + 4, buf);
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u8x8_DrawTile(u8x8, x + 1, y + 1, 1, buf);
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}
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void u8x8_Draw2x2Glyph(u8x8_t* u8x8, uint8_t x, uint8_t y, uint8_t encoding) {
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uint8_t th = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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uint8_t tv = u8x8_pgm_read(u8x8->font + 3); /* new 2019 format */
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uint8_t xx, tile;
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th *= 2;
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th += x;
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tv *= 2;
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tv += y;
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tile = 0;
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do {
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xx = x;
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do {
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u8x8_draw_2x2_subglyph(u8x8, xx, y, encoding, tile);
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tile++;
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xx += 2;
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} while(xx < th);
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y += 2;
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} while(y < tv);
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}
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/* https://github.com/olikraus/u8g2/issues/474 */
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static void
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u8x8_draw_1x2_subglyph(u8x8_t* u8x8, uint8_t x, uint8_t y, uint8_t encoding, uint8_t tile) {
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uint8_t i;
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uint16_t t;
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uint8_t buf[8];
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uint8_t buf1[8];
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uint8_t buf2[8];
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u8x8_get_glyph_data(u8x8, encoding, buf, tile);
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for(i = 0; i < 8; i++) {
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t = u8x8_upscale_byte(buf[i]);
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buf1[i] = t >> 8;
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buf2[i] = t & 255;
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}
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u8x8_DrawTile(u8x8, x, y, 1, buf2);
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u8x8_DrawTile(u8x8, x, y + 1, 1, buf1);
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}
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void u8x8_Draw1x2Glyph(u8x8_t* u8x8, uint8_t x, uint8_t y, uint8_t encoding) {
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uint8_t th = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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uint8_t tv = u8x8_pgm_read(u8x8->font + 3); /* new 2019 format */
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uint8_t xx, tile;
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th += x;
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tv *= 2;
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tv += y;
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tile = 0;
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do {
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xx = x;
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do {
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u8x8_draw_1x2_subglyph(u8x8, xx, y, encoding, tile);
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tile++;
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xx++;
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} while(xx < th);
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y += 2;
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} while(y < tv);
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}
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/*
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source: https://en.wikipedia.org/wiki/UTF-8
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Bits from to bytes Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6
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7 U+0000 U+007F 1 0xxxxxxx
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11 U+0080 U+07FF 2 110xxxxx 10xxxxxx
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16 U+0800 U+FFFF 3 1110xxxx 10xxxxxx 10xxxxxx
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21 U+10000 U+1FFFFF 4 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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26 U+200000 U+3FFFFFF 5 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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31 U+4000000 U+7FFFFFFF 6 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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*/
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/* reset the internal state machine */
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void u8x8_utf8_init(u8x8_t* u8x8) {
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u8x8->utf8_state = 0; /* also reset during u8x8_SetupDefaults() */
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}
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uint16_t u8x8_ascii_next(U8X8_UNUSED u8x8_t* u8x8, uint8_t b) {
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if(b == 0 || b == '\n') /* '\n' terminates the string to support the string list procedures */
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return 0x0ffff; /* end of string detected*/
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return b;
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}
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/*
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pass a byte from an utf8 encoded string to the utf8 decoder state machine
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returns
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0x0fffe: no glyph, just continue
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0x0ffff: end of string
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anything else: The decoded encoding
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*/
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uint16_t u8x8_utf8_next(u8x8_t* u8x8, uint8_t b) {
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if(b == 0 || b == '\n') /* '\n' terminates the string to support the string list procedures */
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return 0x0ffff; /* end of string detected, pending UTF8 is discarded */
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if(u8x8->utf8_state == 0) {
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if(b >= 0xfc) /* 6 byte sequence */
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{
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u8x8->utf8_state = 5;
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b &= 1;
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} else if(b >= 0xf8) {
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u8x8->utf8_state = 4;
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b &= 3;
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} else if(b >= 0xf0) {
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u8x8->utf8_state = 3;
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b &= 7;
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} else if(b >= 0xe0) {
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u8x8->utf8_state = 2;
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b &= 15;
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} else if(b >= 0xc0) {
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u8x8->utf8_state = 1;
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b &= 0x01f;
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} else {
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/* do nothing, just use the value as encoding */
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return b;
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}
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u8x8->encoding = b;
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return 0x0fffe;
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} else {
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u8x8->utf8_state--;
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/* The case b < 0x080 (an illegal UTF8 encoding) is not checked here. */
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u8x8->encoding <<= 6;
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b &= 0x03f;
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u8x8->encoding |= b;
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if(u8x8->utf8_state != 0) return 0x0fffe; /* nothing to do yet */
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}
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return u8x8->encoding;
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}
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static uint8_t u8x8_draw_string(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) U8X8_NOINLINE;
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static uint8_t u8x8_draw_string(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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uint16_t e;
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uint8_t cnt = 0;
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uint8_t th = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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u8x8_utf8_init(u8x8);
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for(;;) {
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e = u8x8->next_cb(u8x8, (uint8_t)*s);
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if(e == 0x0ffff) break;
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s++;
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if(e != 0x0fffe) {
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u8x8_DrawGlyph(u8x8, x, y, e);
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x += th;
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cnt++;
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}
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}
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return cnt;
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}
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uint8_t u8x8_DrawString(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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u8x8->next_cb = u8x8_ascii_next;
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return u8x8_draw_string(u8x8, x, y, s);
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}
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uint8_t u8x8_DrawUTF8(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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u8x8->next_cb = u8x8_utf8_next;
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return u8x8_draw_string(u8x8, x, y, s);
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}
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static uint8_t
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u8x8_draw_2x2_string(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) U8X8_NOINLINE;
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static uint8_t u8x8_draw_2x2_string(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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uint16_t e;
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uint8_t cnt = 0;
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uint8_t th = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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th <<= 1;
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u8x8_utf8_init(u8x8);
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for(;;) {
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e = u8x8->next_cb(u8x8, (uint8_t)*s);
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if(e == 0x0ffff) break;
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s++;
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if(e != 0x0fffe) {
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u8x8_Draw2x2Glyph(u8x8, x, y, e);
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x += th;
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cnt++;
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}
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}
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return cnt;
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}
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uint8_t u8x8_Draw2x2String(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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u8x8->next_cb = u8x8_ascii_next;
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return u8x8_draw_2x2_string(u8x8, x, y, s);
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}
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uint8_t u8x8_Draw2x2UTF8(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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u8x8->next_cb = u8x8_utf8_next;
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return u8x8_draw_2x2_string(u8x8, x, y, s);
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}
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static uint8_t
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u8x8_draw_1x2_string(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) U8X8_NOINLINE;
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static uint8_t u8x8_draw_1x2_string(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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uint16_t e;
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uint8_t cnt = 0;
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uint8_t th = u8x8_pgm_read(u8x8->font + 2); /* new 2019 format */
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u8x8_utf8_init(u8x8);
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for(;;) {
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e = u8x8->next_cb(u8x8, (uint8_t)*s);
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if(e == 0x0ffff) break;
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s++;
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if(e != 0x0fffe) {
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u8x8_Draw1x2Glyph(u8x8, x, y, e);
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x += th;
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cnt++;
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}
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}
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return cnt;
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}
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uint8_t u8x8_Draw1x2String(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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u8x8->next_cb = u8x8_ascii_next;
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return u8x8_draw_1x2_string(u8x8, x, y, s);
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}
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uint8_t u8x8_Draw1x2UTF8(u8x8_t* u8x8, uint8_t x, uint8_t y, const char* s) {
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u8x8->next_cb = u8x8_utf8_next;
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return u8x8_draw_1x2_string(u8x8, x, y, s);
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}
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uint8_t u8x8_GetUTF8Len(u8x8_t* u8x8, const char* s) {
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uint16_t e;
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uint8_t cnt = 0;
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u8x8_utf8_init(u8x8);
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for(;;) {
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e = u8x8_utf8_next(u8x8, *s);
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if(e == 0x0ffff) break;
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s++;
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if(e != 0x0fffe) cnt++;
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}
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return cnt;
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}
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