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lvgl/src/lv_font/lv_font_fmt_txt.c
Gabor Kiss-Vamosi e1c46cb9bc Merge branch 'feat-subpixel' into dev-6.1
2019-10-18 14:58:04 +02:00

480 lines
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/**
* @file lv_font.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_font.h"
#include "lv_font_fmt_txt.h"
#include "../lv_core/lv_debug.h"
#include "../lv_draw/lv_draw.h"
#include "../lv_misc/lv_types.h"
#include "../lv_misc/lv_log.h"
#include "../lv_misc/lv_utils.h"
#include "../lv_misc/lv_mem.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
typedef enum {
RLE_STATE_SINGLE = 0,
RLE_STATE_REPEATE,
RLE_STATE_COUNTER,
}rle_state_t;
/**********************
* STATIC PROTOTYPES
**********************/
static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter);
static int8_t get_kern_value(const lv_font_t * font, uint32_t gid_left, uint32_t gid_right);
static int32_t unicode_list_compare(const void * ref, const void * element);
static int32_t kern_pair_8_compare(const void * ref, const void * element);
static int32_t kern_pair_16_compare(const void * ref, const void * element);
static void decompress(const uint8_t * in, uint8_t * out, lv_coord_t w, lv_coord_t h, uint8_t bpp);
static void decompress_line(uint8_t * out, lv_coord_t w);
static uint8_t get_bits(const uint8_t * in, uint32_t bit_pos, uint8_t len);
static void bits_write(uint8_t * out, uint32_t bit_pos, uint8_t val, uint8_t len);
static void rle_init(const uint8_t * in, uint8_t bpp);
static uint8_t rle_next(void);
/**********************
* STATIC VARIABLES
**********************/
static uint32_t rle_rdp;
static const uint8_t * rle_in;
static uint8_t rle_bpp;
static uint8_t rle_prev_v;
static uint8_t rle_cnt;
static rle_state_t rle_state;
/**********************
* GLOBAL PROTOTYPES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Used as `get_glyph_bitmap` callback in LittelvGL's native font format if the font is uncompressed.
* @param font pointer to font
* @param unicode_letter an unicode letter which bitmap should be get
* @return pointer to the bitmap or NULL if not found
*/
const uint8_t * lv_font_get_bitmap_fmt_txt(const lv_font_t * font, uint32_t unicode_letter)
{
lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
uint32_t gid = get_glyph_dsc_id(font, unicode_letter);
if(!gid) return false;
const lv_font_fmt_txt_glyph_dsc_t * gdsc = &fdsc->glyph_dsc[gid];
if(fdsc->bitmap_format == LV_FONT_FMT_TXT_PLAIN) {
if(gdsc) return &fdsc->glyph_bitmap[gdsc->bitmap_index];
}
/*Handle compressed bitmap*/
else
{
static uint8_t * buf = NULL;
uint32_t gsize = gdsc->box_w * gdsc->box_h;
if(gsize == 0) return NULL;
uint32_t buf_size = gsize;
switch(fdsc->bpp) {
case 1: buf_size = gsize >> 3; break;
case 2: buf_size = gsize >> 2; break;
case 3: buf_size = gsize >> 1; break;
case 4: buf_size = gsize >> 1; break;
}
if(lv_mem_get_size(buf) < buf_size) {
buf = lv_mem_realloc(buf, buf_size);
LV_ASSERT_MEM(buf);
if(buf == NULL) return NULL;
}
decompress(&fdsc->glyph_bitmap[gdsc->bitmap_index], buf, gdsc->box_w , gdsc->box_h, fdsc->bpp);
return buf;
}
/*If not returned earlier then the letter is not found in this font*/
return NULL;
}
/**
* Used as `get_glyph_dsc` callback in LittelvGL's native font format if the font is uncompressed.
* @param font_p pointer to font
* @param dsc_out store the result descriptor here
* @param letter an UNICODE letter code
* @return true: descriptor is successfully loaded into `dsc_out`.
* false: the letter was not found, no data is loaded to `dsc_out`
*/
bool lv_font_get_glyph_dsc_fmt_txt(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out, uint32_t unicode_letter, uint32_t unicode_letter_next)
{
lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
uint32_t gid = get_glyph_dsc_id(font, unicode_letter);
if(!gid) return false;
int8_t kvalue = 0;
if(fdsc->kern_dsc) {
uint32_t gid_next = get_glyph_dsc_id(font, unicode_letter_next);
if(gid_next) {
kvalue = get_kern_value(font, gid, gid_next);
}
}
/*Put together a glyph dsc*/
const lv_font_fmt_txt_glyph_dsc_t * gdsc = &fdsc->glyph_dsc[gid];
int32_t kv = ((int32_t)((int32_t)kvalue * fdsc->kern_scale) >> 4);
uint32_t adv_w = gdsc->adv_w + kv;
adv_w = (adv_w + (1 << 3)) >> 4;
dsc_out->adv_w = adv_w;
dsc_out->box_h = gdsc->box_h;
dsc_out->box_w = gdsc->box_w;
dsc_out->ofs_x = gdsc->ofs_x;
dsc_out->ofs_y = gdsc->ofs_y;
dsc_out->bpp = fdsc->bpp;
return true;
}
/**********************
* STATIC FUNCTIONS
**********************/
static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter)
{
if(letter == '\0') return 0;
lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
/*Check the cache first*/
if(letter == fdsc->last_letter) return fdsc->last_glyph_id;
uint16_t i;
for(i = 0; i < fdsc->cmap_num; i++) {
/*Relative code point*/
uint32_t rcp = letter - fdsc->cmaps[i].range_start;
if(rcp > fdsc->cmaps[i].range_length) continue;
uint32_t glyph_id = 0;
if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY) {
glyph_id = fdsc->cmaps[i].glyph_id_start + rcp;
}
else if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL) {
const uint8_t * gid_ofs_8 = fdsc->cmaps[i].glyph_id_ofs_list;
glyph_id = fdsc->cmaps[i].glyph_id_start + gid_ofs_8[rcp];
}
else if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_SPARSE_TINY) {
uint8_t * p = lv_utils_bsearch(&rcp, fdsc->cmaps[i].unicode_list, fdsc->cmaps[i].list_length, sizeof(fdsc->cmaps[i].unicode_list[0]), unicode_list_compare);
if(p) {
uint32_t ofs = (lv_uintptr_t)p - (lv_uintptr_t) fdsc->cmaps[i].unicode_list;
ofs = ofs >> 1; /*The list stores `uint16_t` so the get the index divide by 2*/
glyph_id = fdsc->cmaps[i].glyph_id_start + ofs;
}
}
else if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_SPARSE_FULL) {
uint8_t * p = lv_utils_bsearch(&rcp, fdsc->cmaps[i].unicode_list, fdsc->cmaps[i].list_length, sizeof(fdsc->cmaps[i].unicode_list[0]), unicode_list_compare);
if(p) {
uint32_t ofs = (lv_uintptr_t)p - (lv_uintptr_t) fdsc->cmaps[i].unicode_list;
ofs = ofs >> 1; /*The list stores `uint16_t` so the get the index divide by 2*/
const uint8_t * gid_ofs_16 = fdsc->cmaps[i].glyph_id_ofs_list;
glyph_id = fdsc->cmaps[i].glyph_id_start + gid_ofs_16[ofs];
}
}
/*Update the cache*/
fdsc->last_letter = letter;
fdsc->last_glyph_id = glyph_id;
return glyph_id;
}
fdsc->last_letter = letter;
fdsc->last_glyph_id = 0;
return 0;
}
static int8_t get_kern_value(const lv_font_t * font, uint32_t gid_left, uint32_t gid_right)
{
lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
int8_t value = 0;
if(fdsc->kern_classes == 0) {
/*Kern pairs*/
const lv_font_fmt_txt_kern_pair_t * kdsc = fdsc->kern_dsc;
if(kdsc->glyph_ids_size == 0) {
/* Use binary search to find the kern value.
* The pairs are ordered left_id first, then right_id secondly. */
const uint8_t * g_ids = kdsc->glyph_ids;
uint16_t g_id_both = (gid_right << 8) + gid_left; /*Create one number from the ids*/
uint8_t * kid_p = lv_utils_bsearch(&g_id_both, g_ids, kdsc->pair_cnt, 2, kern_pair_8_compare);
/*If the `g_id_both` were found get its index from the pointer*/
if(kid_p) {
uint32_t ofs = (lv_uintptr_t)kid_p - (lv_uintptr_t)g_ids;
ofs = ofs >> 1; /*ofs is for pair, divide by 2 to refer as a single value*/
value = kdsc->values[ofs];
}
} else if(kdsc->glyph_ids_size == 1) {
/* Use binary search to find the kern value.
* The pairs are ordered left_id first, then right_id secondly. */
const uint16_t * g_ids = kdsc->glyph_ids;
uint32_t g_id_both = (uint32_t)((uint32_t)gid_right << 8) + gid_left; /*Create one number from the ids*/
uint8_t * kid_p = lv_utils_bsearch(&g_id_both, g_ids, kdsc->pair_cnt, 4, kern_pair_16_compare);
/*If the `g_id_both` were found get its index from the pointer*/
if(kid_p) {
uint32_t ofs = (lv_uintptr_t)kid_p - (lv_uintptr_t)g_ids;
ofs = ofs >> 4; /*ofs is 4 byte pairs, divide by 4 to refer as a single value*/
value = kdsc->values[ofs];
}
} else {
/*Invalid value*/
}
} else {
/*Kern classes*/
const lv_font_fmt_txt_kern_classes_t * kdsc = fdsc->kern_dsc;
uint8_t left_class = kdsc->left_class_mapping[gid_left];
uint8_t right_class = kdsc->left_class_mapping[gid_right];
/* If class = 0, kerning not exist for that glyph
* else got the value form `class_pair_values` 2D array*/
if(left_class > 0 && right_class > 0) {
value = kdsc->class_pair_values[(left_class-1)* kdsc->right_class_cnt + (right_class-1)];
}
}
return value;
}
static int32_t kern_pair_8_compare(const void * ref, const void * element)
{
const uint8_t * ref8_p = ref;
const uint8_t * element8_p = element;
/*If the MSB is different it will matter. If not return the diff. of the LSB*/
if(ref8_p[0] != element8_p[0]) return (int32_t)ref8_p[0] - element8_p[0];
else return (int32_t) ref8_p[1] - element8_p[1];
}
static int32_t kern_pair_16_compare(const void * ref, const void * element)
{
const uint16_t * ref16_p = ref;
const uint16_t * element16_p = element;
/*If the MSB is different it will matter. If not return the diff. of the LSB*/
if(ref16_p[0] != element16_p[0]) return (int32_t)ref16_p[0] - element16_p[0];
else return (int32_t) ref16_p[1] - element16_p[1];
}
/**
* The compress a glyph's bitmap
* @param in the compressed bitmap
* @param out buffer to store the result
* @param px_num number of pixels in the glyph (width * height)
* @param bpp bit per pixel (bpp = 3 will be converted to bpp = 4)
*/
static void decompress(const uint8_t * in, uint8_t * out, lv_coord_t w, lv_coord_t h, uint8_t bpp)
{
uint32_t wrp = 0;
uint8_t wr_size = bpp;
if(bpp == 3) wr_size = 4;
rle_init(in, bpp);
uint8_t * line_buf = lv_draw_get_buf(w * 2);
uint8_t * line_buf1 = line_buf;
uint8_t * line_buf2 = line_buf + w;
decompress_line(line_buf1, w);
lv_coord_t y;
lv_coord_t x;
for(x = 0; x < w; x++) {
bits_write(out,wrp, line_buf1[x], bpp);
wrp += wr_size;
}
for(y = 1; y < h; y++) {
decompress_line(line_buf2, w);
for(x = 0; x < w; x++) {
line_buf1[x] = line_buf2[x] ^ line_buf1[x];
bits_write(out,wrp, line_buf1[x], bpp);
wrp += wr_size;
}
}
}
/**
* Decompress one line. Store one pixel per byte
* @param out output buffer
* @param w width of the line in pixel count
*/
static void decompress_line(uint8_t * out, lv_coord_t w)
{
lv_coord_t i;
for(i = 0; i < w; i++) {
out[i] = rle_next();
}
}
/**
* Read bits from an input buffer. The read can cross byte boundary.
* @param in the input buffer to read from.
* @param bit_pos index of teh first bit to read.
* @param len number of bits to read (must be <= 8).
* @return the read bits
*/
static uint8_t get_bits(const uint8_t * in, uint32_t bit_pos, uint8_t len)
{
uint8_t res = 0;
uint32_t byte_pos = bit_pos >> 3;
bit_pos = bit_pos & 0x7;
uint8_t bit_mask = (uint16_t)((uint16_t) 1 << len) - 1;
uint16_t in16 = (in[byte_pos] << 8) + in[byte_pos + 1];
res = (in16 >> (16 - bit_pos - len)) & bit_mask;
return res;
}
/**
* Write `val` data to `bit_pos` position of `out`. The write can NOT cross byte boundary.
* @param out buffer where to write
* @param bit_pos bit index to write
* @param val value to write
* @param len length of bits to write from `val`. (Counted from the LSB).
* @note `len == 3` will be converted to `len = 4` and `val` will be upscaled too
*/
static void bits_write(uint8_t * out, uint32_t bit_pos, uint8_t val, uint8_t len)
{
if(len == 3) {
len = 4;
switch(val) {
case 0: val = 0; break;
case 1: val = 2; break;
case 2: val = 4; break;
case 3: val = 6; break;
case 4: val = 9; break;
case 5: val = 11; break;
case 6: val = 13; break;
case 7: val = 15; break;
}
}
uint16_t byte_pos = bit_pos >> 3;
bit_pos = bit_pos & 0x7;
bit_pos = 8 - bit_pos - len;
uint8_t bit_mask = (uint16_t)((uint16_t) 1 << len) - 1;
out[byte_pos] &= ((~bit_mask) << bit_pos);
out[byte_pos] |= (val << bit_pos);
}
static void rle_init(const uint8_t * in, uint8_t bpp)
{
rle_in = in;
rle_bpp = bpp;
rle_state = RLE_STATE_SINGLE;
rle_rdp = 0;
rle_prev_v = 0;
rle_cnt = 0;
}
static uint8_t rle_next(void)
{
uint8_t v = 0;
uint8_t ret = 0;
if(rle_state == RLE_STATE_SINGLE) {
ret = get_bits(rle_in, rle_rdp, rle_bpp);
if(rle_rdp != 0 && rle_prev_v == ret) {
rle_cnt = 0;
rle_state = RLE_STATE_REPEATE;
}
rle_prev_v = ret;
rle_rdp += rle_bpp;
}
else if(rle_state == RLE_STATE_REPEATE) {
v = get_bits(rle_in, rle_rdp, 1);
rle_cnt++;
rle_rdp += 1;
if(v == 1) {
ret = rle_prev_v;
if(rle_cnt == 11) {
rle_cnt = get_bits(rle_in, rle_rdp, 6);
rle_rdp += 6;
if(rle_cnt != 0) {
rle_state = RLE_STATE_COUNTER;
} else {
ret = get_bits(rle_in, rle_rdp, rle_bpp);
rle_prev_v = ret;
rle_rdp += rle_bpp;
rle_state = RLE_STATE_SINGLE;
}
}
} else {
ret = get_bits(rle_in, rle_rdp, rle_bpp);
rle_prev_v = ret;
rle_rdp += rle_bpp;
rle_state = RLE_STATE_SINGLE;
}
}
else if(rle_state == RLE_STATE_COUNTER) {
ret = rle_prev_v;
rle_cnt--;
if(rle_cnt == 0) {
ret = get_bits(rle_in, rle_rdp, rle_bpp);
rle_prev_v = ret;
rle_rdp += rle_bpp;
rle_state = RLE_STATE_SINGLE;
}
}
return ret;
}
/** Code Comparator.
*
* Compares the value of both input arguments.
*
* @param[in] pRef Pointer to the reference.
* @param[in] pElement Pointer to the element to compare.
*
* @return Result of comparison.
* @retval < 0 Reference is greater than element.
* @retval = 0 Reference is equal to element.
* @retval > 0 Reference is less than element.
*
*/
static int32_t unicode_list_compare(const void * ref, const void * element)
{
return (*(uint16_t *)ref) - (*(uint16_t *)element);
}
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