chenyf
/
lvgl_cpp
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
lvgl_cpp/lvgl/draw/sw/lv_draw_sw_letter.c

552 lines
20 KiB
C
Raw Permalink Normal View History

v0.1
2023-03-14 11:57:25 +00:00
/**
* @file lv_draw_sw_letter.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_draw_sw.h"
#include "../../hal/lv_hal_disp.h"
#include "../../misc/lv_math.h"
#include "../../misc/lv_assert.h"
#include "../../misc/lv_area.h"
#include "../../misc/lv_style.h"
#include "../../font/lv_font.h"
#include "../../core/lv_refr.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
LV_ATTRIBUTE_FAST_MEM static void draw_letter_normal(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc,
const lv_point_t * pos, lv_font_glyph_dsc_t * g, const uint8_t * map_p);
#if LV_DRAW_COMPLEX && LV_USE_FONT_SUBPX
static void draw_letter_subpx(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc, const lv_point_t * pos,
lv_font_glyph_dsc_t * g, const uint8_t * map_p);
#endif /*LV_DRAW_COMPLEX && LV_USE_FONT_SUBPX*/
/**********************
* STATIC VARIABLES
**********************/
/**********************
* GLOBAL VARIABLES
**********************/
const uint8_t _lv_bpp1_opa_table[2] = {0, 255}; /*Opacity mapping with bpp = 1 (Just for compatibility)*/
const uint8_t _lv_bpp2_opa_table[4] = {0, 85, 170, 255}; /*Opacity mapping with bpp = 2*/
const uint8_t _lv_bpp3_opa_table[8] = {0, 36, 73, 109, /*Opacity mapping with bpp = 3*/
146, 182, 219, 255
};
const uint8_t _lv_bpp4_opa_table[16] = {0, 17, 34, 51, /*Opacity mapping with bpp = 4*/
68, 85, 102, 119,
136, 153, 170, 187,
204, 221, 238, 255
};
const uint8_t _lv_bpp8_opa_table[256] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Draw a letter in the Virtual Display Buffer
* @param pos_p left-top coordinate of the latter
* @param mask_p the letter will be drawn only on this area (truncated to draw_buf area)
* @param font_p pointer to font
* @param letter a letter to draw
* @param color color of letter
* @param opa opacity of letter (0..255)
*/
void lv_draw_sw_letter(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc, const lv_point_t * pos_p,
uint32_t letter)
{
lv_font_glyph_dsc_t g;
bool g_ret = lv_font_get_glyph_dsc(dsc->font, &g, letter, '\0');
if(g_ret == false) {
/*Add warning if the dsc is not found
*but do not print warning for non printable ASCII chars (e.g. '\n')*/
if(letter >= 0x20 &&
letter != 0xf8ff && /*LV_SYMBOL_DUMMY*/
letter != 0x200c) { /*ZERO WIDTH NON-JOINER*/
LV_LOG_WARN("lv_draw_letter: glyph dsc. not found for U+%" PRIX32, letter);
/* draw placeholder */
lv_area_t glyph_coords;
lv_draw_rect_dsc_t glyph_dsc;
lv_coord_t begin_x = pos_p->x + g.ofs_x;
lv_coord_t begin_y = pos_p->y + g.ofs_y;
lv_area_set(&glyph_coords, begin_x, begin_y, begin_x + g.box_w, begin_y + g.box_h);
lv_draw_rect_dsc_init(&glyph_dsc);
glyph_dsc.bg_opa = LV_OPA_MIN;
glyph_dsc.outline_opa = LV_OPA_MIN;
glyph_dsc.shadow_opa = LV_OPA_MIN;
glyph_dsc.bg_img_opa = LV_OPA_MIN;
glyph_dsc.border_color = dsc->color;
glyph_dsc.border_width = 1;
draw_ctx->draw_rect(draw_ctx, &glyph_dsc, &glyph_coords);
}
return;
}
/*Don't draw anything if the character is empty. E.g. space*/
if((g.box_h == 0) || (g.box_w == 0)) return;
lv_point_t gpos;
gpos.x = pos_p->x + g.ofs_x;
gpos.y = pos_p->y + (dsc->font->line_height - dsc->font->base_line) - g.box_h - g.ofs_y;
/*If the letter is completely out of mask don't draw it*/
if(gpos.x + g.box_w < draw_ctx->clip_area->x1 ||
gpos.x > draw_ctx->clip_area->x2 ||
gpos.y + g.box_h < draw_ctx->clip_area->y1 ||
gpos.y > draw_ctx->clip_area->y2) {
return;
}
const uint8_t * map_p = lv_font_get_glyph_bitmap(g.resolved_font, letter);
if(map_p == NULL) {
LV_LOG_WARN("lv_draw_letter: character's bitmap not found");
return;
}
if(g.resolved_font->subpx) {
#if LV_DRAW_COMPLEX && LV_USE_FONT_SUBPX
draw_letter_subpx(draw_ctx, dsc, &gpos, &g, map_p);
#else
LV_LOG_WARN("Can't draw sub-pixel rendered letter because LV_USE_FONT_SUBPX == 0 in lv_conf.h");
#endif
}
else {
draw_letter_normal(draw_ctx, dsc, &gpos, &g, map_p);
}
}
/**********************
* STATIC FUNCTIONS
**********************/
LV_ATTRIBUTE_FAST_MEM static void draw_letter_normal(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc,
const lv_point_t * pos, lv_font_glyph_dsc_t * g, const uint8_t * map_p)
{
const uint8_t * bpp_opa_table_p;
uint32_t bitmask_init;
uint32_t bitmask;
uint32_t bpp = g->bpp;
lv_opa_t opa = dsc->opa;
uint32_t shades;
if(bpp == 3) bpp = 4;
switch(bpp) {
case 1:
bpp_opa_table_p = _lv_bpp1_opa_table;
bitmask_init = 0x80;
shades = 2;
break;
case 2:
bpp_opa_table_p = _lv_bpp2_opa_table;
bitmask_init = 0xC0;
shades = 4;
break;
case 4:
bpp_opa_table_p = _lv_bpp4_opa_table;
bitmask_init = 0xF0;
shades = 16;
break;
case 8:
bpp_opa_table_p = _lv_bpp8_opa_table;
bitmask_init = 0xFF;
shades = 256;
break; /*No opa table, pixel value will be used directly*/
default:
LV_LOG_WARN("lv_draw_letter: invalid bpp");
return; /*Invalid bpp. Can't render the letter*/
}
static lv_opa_t opa_table[256];
static lv_opa_t prev_opa = LV_OPA_TRANSP;
static uint32_t prev_bpp = 0;
if(opa < LV_OPA_MAX) {
if(prev_opa != opa || prev_bpp != bpp) {
uint32_t i;
for(i = 0; i < shades; i++) {
opa_table[i] = bpp_opa_table_p[i] == LV_OPA_COVER ? opa : ((bpp_opa_table_p[i] * opa) >> 8);
}
}
bpp_opa_table_p = opa_table;
prev_opa = opa;
prev_bpp = bpp;
}
int32_t col, row;
int32_t box_w = g->box_w;
int32_t box_h = g->box_h;
int32_t width_bit = box_w * bpp; /*Letter width in bits*/
/*Calculate the col/row start/end on the map*/
int32_t col_start = pos->x >= draw_ctx->clip_area->x1 ? 0 : draw_ctx->clip_area->x1 - pos->x;
int32_t col_end = pos->x + box_w <= draw_ctx->clip_area->x2 ? box_w : draw_ctx->clip_area->x2 - pos->x + 1;
int32_t row_start = pos->y >= draw_ctx->clip_area->y1 ? 0 : draw_ctx->clip_area->y1 - pos->y;
int32_t row_end = pos->y + box_h <= draw_ctx->clip_area->y2 ? box_h : draw_ctx->clip_area->y2 - pos->y + 1;
/*Move on the map too*/
uint32_t bit_ofs = (row_start * width_bit) + (col_start * bpp);
map_p += bit_ofs >> 3;
uint8_t letter_px;
uint32_t col_bit;
col_bit = bit_ofs & 0x7; /*"& 0x7" equals to "% 8" just faster*/
lv_draw_sw_blend_dsc_t blend_dsc;
lv_memset_00(&blend_dsc, sizeof(blend_dsc));
blend_dsc.color = dsc->color;
blend_dsc.opa = dsc->opa;
blend_dsc.blend_mode = dsc->blend_mode;
lv_coord_t hor_res = lv_disp_get_hor_res(_lv_refr_get_disp_refreshing());
uint32_t mask_buf_size = box_w * box_h > hor_res ? hor_res : box_w * box_h;
lv_opa_t * mask_buf = lv_mem_buf_get(mask_buf_size);
blend_dsc.mask_buf = mask_buf;
int32_t mask_p = 0;
lv_area_t fill_area;
fill_area.x1 = col_start + pos->x;
fill_area.x2 = col_end + pos->x - 1;
fill_area.y1 = row_start + pos->y;
fill_area.y2 = fill_area.y1;
#if LV_DRAW_COMPLEX
lv_coord_t fill_w = lv_area_get_width(&fill_area);
lv_area_t mask_area;
lv_area_copy(&mask_area, &fill_area);
mask_area.y2 = mask_area.y1 + row_end;
bool mask_any = lv_draw_mask_is_any(&mask_area);
#endif
blend_dsc.blend_area = &fill_area;
blend_dsc.mask_area = &fill_area;
uint32_t col_bit_max = 8 - bpp;
uint32_t col_bit_row_ofs = (box_w + col_start - col_end) * bpp;
for(row = row_start ; row < row_end; row++) {
#if LV_DRAW_COMPLEX
int32_t mask_p_start = mask_p;
#endif
bitmask = bitmask_init >> col_bit;
for(col = col_start; col < col_end; col++) {
/*Load the pixel's opacity into the mask*/
letter_px = (*map_p & bitmask) >> (col_bit_max - col_bit);
if(letter_px) {
mask_buf[mask_p] = bpp_opa_table_p[letter_px];
}
else {
mask_buf[mask_p] = 0;
}
/*Go to the next column*/
if(col_bit < col_bit_max) {
col_bit += bpp;
bitmask = bitmask >> bpp;
}
else {
col_bit = 0;
bitmask = bitmask_init;
map_p++;
}
/*Next mask byte*/
mask_p++;
}
#if LV_DRAW_COMPLEX
/*Apply masks if any*/
if(mask_any) {
blend_dsc.mask_res = lv_draw_mask_apply(mask_buf + mask_p_start, fill_area.x1, fill_area.y2,
fill_w);
if(blend_dsc.mask_res == LV_DRAW_MASK_RES_TRANSP) {
lv_memset_00(mask_buf + mask_p_start, fill_w);
}
}
#endif
if((uint32_t) mask_p + (col_end - col_start) < mask_buf_size) {
fill_area.y2 ++;
}
else {
blend_dsc.mask_res = LV_DRAW_MASK_RES_CHANGED;
lv_draw_sw_blend(draw_ctx, &blend_dsc);
fill_area.y1 = fill_area.y2 + 1;
fill_area.y2 = fill_area.y1;
mask_p = 0;
}
col_bit += col_bit_row_ofs;
map_p += (col_bit >> 3);
col_bit = col_bit & 0x7;
}
/*Flush the last part*/
if(fill_area.y1 != fill_area.y2) {
fill_area.y2--;
blend_dsc.mask_res = LV_DRAW_MASK_RES_CHANGED;
lv_draw_sw_blend(draw_ctx, &blend_dsc);
mask_p = 0;
}
lv_mem_buf_release(mask_buf);
}
#if LV_DRAW_COMPLEX && LV_USE_FONT_SUBPX
static void draw_letter_subpx(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc, const lv_point_t * pos,
lv_font_glyph_dsc_t * g, const uint8_t * map_p)
{
const uint8_t * bpp_opa_table;
uint32_t bitmask_init;
uint32_t bitmask;
uint32_t bpp = g->bpp;
lv_opa_t opa = dsc->opa;
if(bpp == 3) bpp = 4;
switch(bpp) {
case 1:
bpp_opa_table = _lv_bpp1_opa_table;
bitmask_init = 0x80;
break;
case 2:
bpp_opa_table = _lv_bpp2_opa_table;
bitmask_init = 0xC0;
break;
case 4:
bpp_opa_table = _lv_bpp4_opa_table;
bitmask_init = 0xF0;
break;
case 8:
bpp_opa_table = _lv_bpp8_opa_table;
bitmask_init = 0xFF;
break; /*No opa table, pixel value will be used directly*/
default:
LV_LOG_WARN("lv_draw_letter: invalid bpp not found");
return; /*Invalid bpp. Can't render the letter*/
}
int32_t col, row;
int32_t box_w = g->box_w;
int32_t box_h = g->box_h;
int32_t width_bit = box_w * bpp; /*Letter width in bits*/
/*Calculate the col/row start/end on the map*/
int32_t col_start = pos->x >= draw_ctx->clip_area->x1 ? 0 : (draw_ctx->clip_area->x1 - pos->x) * 3;
int32_t col_end = pos->x + box_w / 3 <= draw_ctx->clip_area->x2 ? box_w : (draw_ctx->clip_area->x2 - pos->x + 1) * 3;
int32_t row_start = pos->y >= draw_ctx->clip_area->y1 ? 0 : draw_ctx->clip_area->y1 - pos->y;
int32_t row_end = pos->y + box_h <= draw_ctx->clip_area->y2 ? box_h : draw_ctx->clip_area->y2 - pos->y + 1;
/*Move on the map too*/
int32_t bit_ofs = (row_start * width_bit) + (col_start * bpp);
map_p += bit_ofs >> 3;
uint8_t letter_px;
lv_opa_t px_opa;
int32_t col_bit;
col_bit = bit_ofs & 0x7; /*"& 0x7" equals to "% 8" just faster*/
lv_area_t map_area;
map_area.x1 = col_start / 3 + pos->x;
map_area.x2 = col_end / 3 + pos->x - 1;
map_area.y1 = row_start + pos->y;
map_area.y2 = map_area.y1;
if(map_area.x2 <= map_area.x1) return;
lv_coord_t hor_res = lv_disp_get_hor_res(_lv_refr_get_disp_refreshing());
int32_t mask_buf_size = box_w * box_h > hor_res ? hor_res : g->box_w * g->box_h;
lv_opa_t * mask_buf = lv_mem_buf_get(mask_buf_size);
int32_t mask_p = 0;
lv_color_t * color_buf = lv_mem_buf_get(mask_buf_size * sizeof(lv_color_t));
int32_t dest_buf_stride = lv_area_get_width(draw_ctx->buf_area);
lv_color_t * dest_buf_tmp = draw_ctx->buf;
/*Set a pointer on draw_buf to the first pixel of the letter*/
dest_buf_tmp += ((pos->y - draw_ctx->buf_area->y1) * dest_buf_stride) + pos->x - draw_ctx->buf_area->x1;
/*If the letter is partially out of mask the move there on draw_buf*/
dest_buf_tmp += (row_start * dest_buf_stride) + col_start / 3;
lv_area_t mask_area;
lv_area_copy(&mask_area, &map_area);
mask_area.y2 = mask_area.y1 + row_end;
bool mask_any = lv_draw_mask_is_any(&map_area);
uint8_t font_rgb[3];
lv_color_t color = dsc->color;
#if LV_COLOR_16_SWAP == 0
uint8_t txt_rgb[3] = {color.ch.red, color.ch.green, color.ch.blue};
#else
uint8_t txt_rgb[3] = {color.ch.red, (color.ch.green_h << 3) + color.ch.green_l, color.ch.blue};
#endif
lv_draw_sw_blend_dsc_t blend_dsc;
lv_memset_00(&blend_dsc, sizeof(&blend_dsc));
blend_dsc.blend_area = &map_area;
blend_dsc.mask_area = &map_area;
blend_dsc.src_buf = color_buf;
blend_dsc.mask_buf = mask_buf;
blend_dsc.opa = opa;
blend_dsc.blend_mode = dsc->blend_mode;
for(row = row_start ; row < row_end; row++) {
uint32_t subpx_cnt = 0;
bitmask = bitmask_init >> col_bit;
int32_t mask_p_start = mask_p;
for(col = col_start; col < col_end; col++) {
/*Load the pixel's opacity into the mask*/
letter_px = (*map_p & bitmask) >> (8 - col_bit - bpp);
if(letter_px != 0) {
if(opa >= LV_OPA_MAX) {
px_opa = bpp == 8 ? letter_px : bpp_opa_table[letter_px];
}
else {
px_opa = bpp == 8 ? (uint32_t)((uint32_t)letter_px * opa) >> 8
: (uint32_t)((uint32_t)bpp_opa_table[letter_px] * opa) >> 8;
}
}
else {
px_opa = 0;
}
font_rgb[subpx_cnt] = px_opa;
subpx_cnt ++;
if(subpx_cnt == 3) {
subpx_cnt = 0;
lv_color_t res_color;
#if LV_COLOR_16_SWAP == 0
uint8_t bg_rgb[3] = {dest_buf_tmp->ch.red, dest_buf_tmp->ch.green, dest_buf_tmp->ch.blue};
#else
uint8_t bg_rgb[3] = {dest_buf_tmp->ch.red,
(dest_buf_tmp->ch.green_h << 3) + dest_buf_tmp->ch.green_l,
dest_buf_tmp->ch.blue
};
#endif
#if LV_FONT_SUBPX_BGR
res_color.ch.blue = (uint32_t)((uint32_t)txt_rgb[0] * font_rgb[0] + (bg_rgb[0] * (255 - font_rgb[0]))) >> 8;
res_color.ch.red = (uint32_t)((uint32_t)txt_rgb[2] * font_rgb[2] + (bg_rgb[2] * (255 - font_rgb[2]))) >> 8;
#else
res_color.ch.red = (uint32_t)((uint16_t)txt_rgb[0] * font_rgb[0] + (bg_rgb[0] * (255 - font_rgb[0]))) >> 8;
res_color.ch.blue = (uint32_t)((uint16_t)txt_rgb[2] * font_rgb[2] + (bg_rgb[2] * (255 - font_rgb[2]))) >> 8;
#endif
#if LV_COLOR_16_SWAP == 0
res_color.ch.green = (uint32_t)((uint32_t)txt_rgb[1] * font_rgb[1] + (bg_rgb[1] * (255 - font_rgb[1]))) >> 8;
#else
uint8_t green = (uint32_t)((uint32_t)txt_rgb[1] * font_rgb[1] + (bg_rgb[1] * (255 - font_rgb[1]))) >> 8;
res_color.ch.green_h = green >> 3;
res_color.ch.green_l = green & 0x7;
#endif
#if LV_COLOR_DEPTH == 32
res_color.ch.alpha = 0xff;
#endif
if(font_rgb[0] == 0 && font_rgb[1] == 0 && font_rgb[2] == 0) mask_buf[mask_p] = LV_OPA_TRANSP;
else mask_buf[mask_p] = LV_OPA_COVER;
color_buf[mask_p] = res_color;
/*Next mask byte*/
mask_p++;
dest_buf_tmp++;
}
/*Go to the next column*/
if(col_bit < (int32_t)(8 - bpp)) {
col_bit += bpp;
bitmask = bitmask >> bpp;
}
else {
col_bit = 0;
bitmask = bitmask_init;
map_p++;
}
}
/*Apply masks if any*/
if(mask_any) {
blend_dsc.mask_res = lv_draw_mask_apply(mask_buf + mask_p_start, map_area.x1, map_area.y2,
lv_area_get_width(&map_area));
if(blend_dsc.mask_res == LV_DRAW_MASK_RES_TRANSP) {
lv_memset_00(mask_buf + mask_p_start, lv_area_get_width(&map_area));
}
}
if((int32_t) mask_p + (col_end - col_start) < mask_buf_size) {
map_area.y2 ++;
}
else {
lv_draw_sw_blend(draw_ctx, &blend_dsc);
map_area.y1 = map_area.y2 + 1;
map_area.y2 = map_area.y1;
mask_p = 0;
}
col_bit += ((box_w - col_end) + col_start) * bpp;
map_p += (col_bit >> 3);
col_bit = col_bit & 0x7;
/*Next row in draw_buf*/
dest_buf_tmp += dest_buf_stride - (col_end - col_start) / 3;
}
/*Flush the last part*/
if(map_area.y1 != map_area.y2) {
map_area.y2--;
lv_draw_sw_blend(draw_ctx, &blend_dsc);
}
lv_mem_buf_release(mask_buf);
lv_mem_buf_release(color_buf);
}
#endif /*LV_DRAW_COMPLEX && LV_USE_FONT_SUBPX*/