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issue #41

This commit is contained in:
olikraus 2016-08-09 23:22:00 +02:00
parent 51db548328
commit c9598592ec
5 changed files with 158 additions and 8 deletions
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3
ChangeLog
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@ -26,6 +26,7 @@ https://github.com/olikraus/u8g2 ChangeLog
* Added several fonts from http://int10h.org/oldschool-pc-fonts/
* Added Arabic, Greek and Cyrillic fonts.
* Code cleanup (assert, spi modes, void * warning)
2016-xx-xx v2.2.5 olikraus@gmail.com
* U8x8: Upscale by 2 (Issue 41)

9
cppsrc/U8x8lib.h
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@ -162,12 +162,21 @@ class U8X8 : public Print
void drawGlyph(uint8_t x, uint8_t y, uint8_t encoding) {
u8x8_DrawGlyph(&u8x8, x, y, encoding); }
void draw2x2Glyph(uint8_t x, uint8_t y, uint8_t encoding) {
u8x8_Draw2x2Glyph(&u8x8, x, y, encoding); }
void drawString(uint8_t x, uint8_t y, const char *s) {
u8x8_DrawString(&u8x8, x, y, s); }
void drawUTF8(uint8_t x, uint8_t y, const char *s) {
u8x8_DrawUTF8(&u8x8, x, y, s); }
void draw2x2String(uint8_t x, uint8_t y, const char *s) {
u8x8_Draw2x2String(&u8x8, x, y, s); }
void draw2x2UTF8(uint8_t x, uint8_t y, const char *s) {
u8x8_Draw2x2UTF8(&u8x8, x, y, s); }
uint8_t getUTF8Len(const char *s) {
return u8x8_GetUTF8Len(&u8x8, s); }

3
csrc/u8x8.h
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@ -697,8 +697,11 @@ uint16_t u8x8_utf8_next(u8x8_t *u8x8, uint8_t b);
void u8x8_SetFont(u8x8_t *u8x8, const uint8_t *font_8x8);
void u8x8_DrawGlyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding);
void u8x8_Draw2x2Glyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding);
uint8_t u8x8_DrawString(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s);
uint8_t u8x8_DrawUTF8(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s); /* return number of glyps */
uint8_t u8x8_Draw2x2String(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s);
uint8_t u8x8_Draw2x2UTF8(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s);
uint8_t u8x8_GetUTF8Len(u8x8_t *u8x8, const char *s);
#define u8x8_SetInverseFont(u8x8, b) (u8x8)->is_font_inverse_mode = (b)

138
csrc/u8x8_8x8.c
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@ -45,14 +45,21 @@ void u8x8_SetFont(u8x8_t *u8x8, const uint8_t *font_8x8)
u8x8->font = font_8x8;
}
void u8x8_DrawGlyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
/*
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) U8X8_NOINLINE;
static void u8x8_get_glyph_data(u8x8_t *u8x8, uint8_t encoding, uint8_t *buf)
{
uint8_t first, last, i;
uint8_t buf[8];
uint16_t offset;
first = u8x8_pgm_read(u8x8->font+0);
last = u8x8_pgm_read(u8x8->font+1);
/* get the glyph bitmap from the font */
if ( first <= encoding && encoding <= last )
{
offset = encoding;
@ -72,6 +79,8 @@ void u8x8_DrawGlyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
buf[i] = 0;
}
}
/* invert the bitmap if required */
if ( u8x8->is_font_inverse_mode )
{
for( i = 0; i < 8; i++ )
@ -79,9 +88,95 @@ void u8x8_DrawGlyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
buf[i] ^= 255;
}
}
}
void u8x8_DrawGlyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
{
uint8_t buf[8];
u8x8_get_glyph_data(u8x8, encoding, buf);
u8x8_DrawTile(u8x8, x, y, 1, buf);
}
/*
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);
*/
static 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 );
}
void u8x8_Draw2x2Glyph(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t encoding)
{
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);
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);
}
/*
source: https://en.wikipedia.org/wiki/UTF-8
Bits from to bytes Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6
@ -204,6 +299,45 @@ uint8_t u8x8_DrawUTF8(u8x8_t *u8x8, uint8_t x, uint8_t y, const char *s)
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;
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+=2;
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);
}
uint8_t u8x8_GetUTF8Len(u8x8_t *u8x8, const char *s)
{
uint16_t e;

13
sys/sdl/hello_world_8x8/main.c
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@ -1,16 +1,19 @@
#include "u8x8.h"
u8x8_t u8g2;
u8x8_t u8x8;
int main(void)
{
u8x8_Setup_SDL_128x64(&u8g2);
u8x8_InitDisplay(&u8g2);
u8x8_Setup_SDL_128x64(&u8x8);
u8x8_InitDisplay(&u8x8);
u8x8_SetFont(&u8g2, u8x8_font_amstrad_cpc_extended_f);
u8x8_SetFont(&u8x8, u8x8_font_amstrad_cpc_extended_f);
u8x8_DrawString(&u8x8, 0, 0, "Hello World!");
u8x8_Draw2x2String(&u8x8, 0, 3, "Hello World!");
u8x8_DrawString(&u8g2, 0, 0, "Hello World!");
while( u8g_sdl_get_key() < 0 )
;