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Lockpick_RCM/bdk/libs/lvgl/lv_draw/lv_draw_line.c
shchmue 4ffd4ce7f0 Transition to hekate bdk layout
2020-06-26 14:17:06 -06:00

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/**
* @file lv_draw_line.c
*
*/
/*********************
* INCLUDES
*********************/
#include <stdio.h>
#include "lv_draw.h"
#include "../lv_misc/lv_math.h"
/*********************
* DEFINES
*********************/
#if LV_COMPILER_VLA_SUPPORTED == 0
#define LINE_MAX_WIDTH 64
#endif
/**********************
* TYPEDEFS
**********************/
typedef struct {
lv_point_t p1;
lv_point_t p2;
lv_point_t p_act;
lv_coord_t dx;
lv_coord_t sx; /*-1: x1 < x2; 1: x2 >= x1*/
lv_coord_t dy;
lv_coord_t sy; /*-1: y1 < y2; 1: y2 >= y1*/
lv_coord_t err;
lv_coord_t e2;
bool hor; /*Rather horizontal or vertical*/
} line_draw_t;
typedef struct {
lv_coord_t width;
lv_coord_t width_1;
lv_coord_t width_half;
} line_width_t;
/**********************
* STATIC PROTOTYPES
**********************/
static void line_draw_hor(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
static void line_draw_ver(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
static void line_draw_skew(line_draw_t * main_line, bool dir_ori, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale);
static void line_init(line_draw_t * line, const lv_point_t * p1, const lv_point_t * p2);
static bool line_next(line_draw_t * line);
static bool line_next_y(line_draw_t * line);
static bool line_next_x(line_draw_t * line);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Draw a line
* @param point1 first point of the line
* @param point2 second point of the line
* @param mask the line will be drawn only on this area
* @param style pointer to a line's style
* @param opa_scale scale down all opacities by the factor
*/
void lv_draw_line(const lv_point_t * point1, const lv_point_t * point2, const lv_area_t * mask,
const lv_style_t * style, lv_opa_t opa_scale)
{
if(style->line.width == 0) return;
if(point1->x == point2->x && point1->y == point2->y) return;
line_draw_t main_line;
lv_point_t p1;
lv_point_t p2;
/*If the line if rather vertical then be sure y1 < y2 else x1 < x2*/
if(LV_MATH_ABS(point1->x - point2->x) > LV_MATH_ABS(point1->y - point2->y)) {
/*Steps less in y then x -> rather horizontal*/
if(point1->x < point2->x) {
p1.x = point1->x;
p1.y = point1->y;
p2.x = point2->x;
p2.y = point2->y;
} else {
p1.x = point2->x;
p1.y = point2->y;
p2.x = point1->x;
p2.y = point1->y;
}
} else {
/*Steps less in x then y -> rather vertical*/
if(point1->y < point2->y) {
p1.x = point1->x;
p1.y = point1->y;
p2.x = point2->x;
p2.y = point2->y;
} else {
p1.x = point2->x;
p1.y = point2->y;
p2.x = point1->x;
p2.y = point1->y;
}
}
line_init(&main_line, &p1, &p2);
/*Special case draw a horizontal line*/
if(main_line.p1.y == main_line.p2.y) {
line_draw_hor(&main_line, mask, style, opa_scale);
}
/*Special case draw a vertical line*/
else if(main_line.p1.x == main_line.p2.x) {
line_draw_ver(&main_line, mask, style, opa_scale);
}
/*Arbitrary skew line*/
else {
bool dir_ori = false;
#if LV_ANTIALIAS
lv_point_t p_tmp;
if(main_line.hor) {
if(main_line.p1.y < main_line.p2.y) {
dir_ori = true;
p_tmp.x = main_line.p2.x;
p_tmp.y = main_line.p2.y - 1;
line_init(&main_line, &p1, &p_tmp);
main_line.sy = LV_MATH_ABS(main_line.sy); /*The sign can change if the line becomes horizontal*/
}
else if(main_line.p1.y > main_line.p2.y) {
dir_ori = false;
p_tmp.x = main_line.p2.x;
p_tmp.y = main_line.p2.y + 1;
line_init(&main_line, &p1, &p_tmp);
main_line.sy = -LV_MATH_ABS(main_line.sy); /*The sign can change if the line becomes horizontal*/
}
}
else {
if(main_line.p1.x < main_line.p2.x) {
dir_ori = true;
p_tmp.x = main_line.p2.x - 1;
p_tmp.y = main_line.p2.y;
line_init(&main_line, &p1, &p_tmp);
main_line.sx = LV_MATH_ABS(main_line.sx); /*The sign can change if the line becomes vertical*/
}
else if(main_line.p1.x > main_line.p2.x) {
dir_ori = false;
p_tmp.x = main_line.p2.x + 1;
p_tmp.y = main_line.p2.y;
line_init(&main_line, &p1, &p_tmp);
main_line.sx = -LV_MATH_ABS(main_line.sx); /*The sign can change if the line becomes vertical*/
}
}
#endif
line_draw_skew(&main_line, dir_ori, mask, style, opa_scale);
}
}
/**********************
* STATIC FUNCTIONS
**********************/
static void line_draw_hor(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
{
lv_coord_t width = style->line.width - 1;
lv_coord_t width_half = width >> 1;
lv_coord_t width_1 = width & 0x1;
lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->line.opa : (uint16_t)((uint16_t) style->line.opa * opa_scale) >> 8;
lv_area_t act_area;
act_area.x1 = main_line->p1.x;
act_area.x2 = main_line->p2.x;
act_area.y1 = main_line->p1.y - width_half - width_1;
act_area.y2 = main_line->p2.y + width_half ;
lv_area_t draw_area;
draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
fill_fp(&draw_area, mask, style->line.color, opa);
}
static void line_draw_ver(line_draw_t * main_line, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
{
lv_coord_t width = style->line.width - 1;
lv_coord_t width_half = width >> 1;
lv_coord_t width_1 = width & 0x1;
lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->line.opa : (uint16_t)((uint16_t) style->line.opa * opa_scale) >> 8;
lv_area_t act_area;
act_area.x1 = main_line->p1.x - width_half;
act_area.x2 = main_line->p2.x + width_half + width_1;
act_area.y1 = main_line->p1.y;
act_area.y2 = main_line->p2.y;
lv_area_t draw_area;
draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
fill_fp(&draw_area, mask, style->line.color, opa);
}
static void line_draw_skew(line_draw_t * main_line, bool dir_ori, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
{
lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->line.opa : (uint16_t)((uint16_t) style->line.opa * opa_scale) >> 8;
lv_point_t vect_main, vect_norm;
vect_main.x = main_line->p2.x - main_line->p1.x;
vect_main.y = main_line->p2.y - main_line->p1.y;
if(main_line->hor) {
if(main_line->p1.y < main_line->p2.y + dir_ori) {
vect_norm.x = - vect_main.y;
vect_norm.y = vect_main.x;
} else {
vect_norm.x = vect_main.y;
vect_norm.y = -vect_main.x;
}
} else {
if(main_line->p1.x < main_line->p2.x + dir_ori) {
vect_norm.x = vect_main.y;
vect_norm.y = - vect_main.x;
} else {
vect_norm.x = - vect_main.y;
vect_norm.y = vect_main.x;
}
}
/* In case of a short but tick line the perpendicular ending is longer then the real line.
* it would break the calculations so make the normal vector larger*/
vect_norm.x = vect_norm.x << 4;
vect_norm.y = vect_norm.y << 4;
lv_coord_t width;
width = style->line.width;
/* The pattern stores the points of the line ending. It has the good direction and length.
* The worth case is the 45° line where pattern can have 1.41 x `width` points*/
#if LV_COMPILER_VLA_SUPPORTED
lv_point_t pattern[width * 2];
#else
lv_point_t pattern[LINE_MAX_WIDTH];
#endif
lv_coord_t i = 0;
/*Create a perpendicular pattern (a small line)*/
if(width != 0) {
line_draw_t pattern_line;
lv_point_t p0 = {0, 0};
line_init(&pattern_line, &p0, &vect_norm);
uint32_t width_sqr = width * width;
/* Run for a lot of times. Meanwhile the real width will be determined as well */
for(i = 0; i < (lv_coord_t)sizeof(pattern); i ++) {
pattern[i].x = pattern_line.p_act.x;
pattern[i].y = pattern_line.p_act.y;
/*Finish the pattern line if it's length equal to the desired width (Use Pythagoras theorem)*/
uint32_t sqr = pattern_line.p_act.x * pattern_line.p_act.x + pattern_line.p_act.y * pattern_line.p_act.y;
if(sqr >= width_sqr) {
width = i;
#if LV_ANTIALIAS
width--;
#endif
break;
}
line_next(&pattern_line);
}
}
#if LV_ANTIALIAS
lv_coord_t width_safe = width;
if(width == 0) width_safe = 1;
lv_coord_t aa_last_corner;
aa_last_corner = 0;
#endif
lv_coord_t x_center_ofs = 0;
lv_coord_t y_center_ofs = 0;
if(width != 0) {
x_center_ofs = pattern[width - 1].x / 2;
y_center_ofs = pattern[width - 1].y / 2;
}
else {
if(main_line->hor && main_line->p1.y >= main_line->p2.y + dir_ori) pattern[0].y --;
if(!main_line->hor && main_line->p1.x >= main_line->p2.x + dir_ori) pattern[0].x --;
}
/* Make the coordinates relative to the center */
for(i = 0; i < width; i++) {
pattern[i].x -= x_center_ofs;
pattern[i].y -= y_center_ofs;
#if LV_ANTIALIAS
if(i != 0) {
if(main_line->hor) {
if(pattern[i - 1].x != pattern[i].x) {
lv_coord_t seg_w = pattern[i].y - pattern[aa_last_corner].y;
if(main_line->sy < 0) {
lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y + seg_w + 1,
seg_w, mask, style->line.color, opa);
lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y + seg_w + 1,
-seg_w, mask, style->line.color, opa);
} else {
lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y,
seg_w, mask, style->line.color, opa);
lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y,
-seg_w, mask, style->line.color, opa);
}
aa_last_corner = i;
}
} else {
if(pattern[i - 1].y != pattern[i].y) {
lv_coord_t seg_w = pattern[i].x - pattern[aa_last_corner].x;
if(main_line->sx < 0) {
lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x + seg_w + 1, main_line->p1.y + pattern[aa_last_corner].y - 1,
seg_w, mask, style->line.color, opa);
lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x + seg_w + 1, main_line->p2.y + pattern[aa_last_corner].y + 1,
-seg_w, mask, style->line.color, opa);
} else {
lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x, main_line->p1.y + pattern[aa_last_corner].y - 1,
seg_w, mask, style->line.color, opa);
lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x, main_line->p2.y + pattern[aa_last_corner].y + 1,
-seg_w, mask, style->line.color, opa);
}
aa_last_corner = i;
}
}
}
#endif
}
#if LV_ANTIALIAS
/*Add the last part of anti-aliasing for the perpendicular ending*/
if(width != 0) { /*Due to rounding error with very thin lines it looks ugly*/
if(main_line->hor) {
lv_coord_t seg_w = pattern[width_safe - 1].y - pattern[aa_last_corner].y;
if(main_line->sy < 0) {
lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y + seg_w,
seg_w + main_line->sy, mask, style->line.color, opa);
lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y + seg_w,
-(seg_w + main_line->sy), mask, style->line.color, opa);
} else {
lv_draw_aa_ver_seg(main_line->p1.x + pattern[aa_last_corner].x - 1, main_line->p1.y + pattern[aa_last_corner].y,
seg_w + main_line->sy, mask, style->line.color, opa);
lv_draw_aa_ver_seg(main_line->p2.x + pattern[aa_last_corner].x + 1, main_line->p2.y + pattern[aa_last_corner].y,
-(seg_w + main_line->sy), mask, style->line.color, opa);
}
} else {
lv_coord_t seg_w = pattern[width_safe - 1].x - pattern[aa_last_corner].x;
if(main_line->sx < 0) {
lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x + seg_w, main_line->p1.y + pattern[aa_last_corner].y - 1,
seg_w + main_line->sx, mask, style->line.color, opa);
lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x + seg_w, main_line->p2.y + pattern[aa_last_corner].y + 1,
-(seg_w + main_line->sx), mask, style->line.color, opa);
} else {
lv_draw_aa_hor_seg(main_line->p1.x + pattern[aa_last_corner].x, main_line->p1.y + pattern[aa_last_corner].y - 1,
seg_w + main_line->sx, mask, style->line.color, opa);
lv_draw_aa_hor_seg(main_line->p2.x + pattern[aa_last_corner].x, main_line->p2.y + pattern[aa_last_corner].y + 1,
-(seg_w + main_line->sx), mask, style->line.color, opa);
}
}
}
#endif
#if LV_ANTIALIAS
/*Shift the anti aliasing on the edges (-1, 1 or 0 (zero only in case width == 0))*/
lv_coord_t aa_shift1;
lv_coord_t aa_shift2;
if(main_line->hor == false) {
if(main_line->sx < 0) {
aa_shift1 = -1;
aa_shift2 = width == 0 ? 0 : aa_shift1;
} else {
aa_shift2 = 1;
aa_shift1 = width == 0 ? 0 : aa_shift2;
}
} else {
if(main_line->sy < 0) {
aa_shift1 = -1;
aa_shift2 = width == 0 ? 0 : aa_shift1;
} else {
aa_shift2 = 1;
aa_shift1 = width == 0 ? 0 : aa_shift2;
}
}
#endif
volatile lv_point_t prev_p;
prev_p.x = main_line->p1.x;
prev_p.y = main_line->p1.y;
lv_area_t draw_area;
bool first_run = true;
if(main_line->hor) {
while(line_next_y(main_line)) {
for(i = 0; i < width; i++) {
draw_area.x1 = prev_p.x + pattern[i].x;
draw_area.y1 = prev_p.y + pattern[i].y;
draw_area.x2 = draw_area.x1 + main_line->p_act.x - prev_p.x - 1;
draw_area.y2 = draw_area.y1;
fill_fp(&draw_area, mask, style->line.color, opa);
/* Fill the gaps
* When stepping in y one pixel remains empty on every corner (don't do this on the first segment ) */
if(i != 0 && pattern[i].x != pattern[i - 1].x && !first_run) {
px_fp(draw_area.x1, draw_area.y1 - main_line->sy, mask, style->line.color, opa);
}
}
#if LV_ANTIALIAS
lv_draw_aa_hor_seg(prev_p.x + pattern[0].x, prev_p.y + pattern[0].y - aa_shift1,
-(main_line->p_act.x - prev_p.x), mask, style->line.color, opa);
lv_draw_aa_hor_seg(prev_p.x + pattern[width_safe - 1].x, prev_p.y + pattern[width_safe - 1].y + aa_shift2,
main_line->p_act.x - prev_p.x, mask, style->line.color, opa);
#endif
first_run = false;
prev_p.x = main_line->p_act.x;
prev_p.y = main_line->p_act.y;
}
for(i = 0; i < width; i++) {
draw_area.x1 = prev_p.x + pattern[i].x;
draw_area.y1 = prev_p.y + pattern[i].y;
draw_area.x2 = draw_area.x1 + main_line->p_act.x - prev_p.x;
draw_area.y2 = draw_area.y1;
fill_fp(&draw_area, mask, style->line.color, opa);
/* Fill the gaps
* When stepping in y one pixel remains empty on every corner */
if(i != 0 && pattern[i].x != pattern[i - 1].x && !first_run) {
px_fp(draw_area.x1, draw_area.y1 - main_line->sy, mask, style->line.color, opa);
}
}
#if LV_ANTIALIAS
lv_draw_aa_hor_seg(prev_p.x + pattern[0].x, prev_p.y + pattern[0].y - aa_shift1,
-(main_line->p_act.x - prev_p.x + 1), mask, style->line.color, opa);
lv_draw_aa_hor_seg(prev_p.x + pattern[width_safe - 1].x, prev_p.y + pattern[width_safe - 1].y + aa_shift2,
main_line->p_act.x - prev_p.x + 1, mask, style->line.color, opa);
#endif
}
/*Rather a vertical line*/
else {
while(line_next_x(main_line)) {
for(i = 0; i < width; i++) {
draw_area.x1 = prev_p.x + pattern[i].x;
draw_area.y1 = prev_p.y + pattern[i].y;
draw_area.x2 = draw_area.x1;
draw_area.y2 = draw_area.y1 + main_line->p_act.y - prev_p.y - 1;
fill_fp(&draw_area, mask, style->line.color, opa);
/* Fill the gaps
* When stepping in x one pixel remains empty on every corner (don't do this on the first segment ) */
if(i != 0 && pattern[i].y != pattern[i - 1].y && !first_run) {
px_fp(draw_area.x1 - main_line->sx, draw_area.y1, mask, style->line.color, opa);
}
}
#if LV_ANTIALIAS
lv_draw_aa_ver_seg(prev_p.x + pattern[0].x - aa_shift1, prev_p.y + pattern[0].y,
-(main_line->p_act.y - prev_p.y), mask, style->line.color, opa);
lv_draw_aa_ver_seg(prev_p.x + pattern[width_safe - 1].x + aa_shift2, prev_p.y + pattern[width_safe - 1].y,
main_line->p_act.y - prev_p.y, mask, style->line.color, opa);
#endif
first_run = false;
prev_p.x = main_line->p_act.x;
prev_p.y = main_line->p_act.y;
}
/*Draw the last part*/
for(i = 0; i < width; i++) {
draw_area.x1 = prev_p.x + pattern[i].x;
draw_area.y1 = prev_p.y + pattern[i].y;
draw_area.x2 = draw_area.x1;
draw_area.y2 = draw_area.y1 + main_line->p_act.y - prev_p.y;
fill_fp(&draw_area, mask, style->line.color, opa);
/* Fill the gaps
* When stepping in x one pixel remains empty on every corner */
if(i != 0 && pattern[i].y != pattern[i - 1].y && !first_run) {
px_fp(draw_area.x1 - main_line->sx, draw_area.y1, mask, style->line.color, opa);
}
}
#if LV_ANTIALIAS
lv_draw_aa_ver_seg(prev_p.x + pattern[0].x - aa_shift1, prev_p.y + pattern[0].y,
-(main_line->p_act.y - prev_p.y + 1), mask, style->line.color, opa);
lv_draw_aa_ver_seg(prev_p.x + pattern[width_safe - 1].x + aa_shift2, prev_p.y + pattern[width_safe - 1].y,
main_line->p_act.y - prev_p.y + 1, mask, style->line.color, opa);
#endif
}
}
static void line_init(line_draw_t * line, const lv_point_t * p1, const lv_point_t * p2)
{
line->p1.x = p1->x;
line->p1.y = p1->y;
line->p2.x = p2->x;
line->p2.y = p2->y;
line->dx = LV_MATH_ABS(line->p2.x - line->p1.x);
line->sx = line->p1.x < line->p2.x ? 1 : -1;
line->dy = LV_MATH_ABS(line->p2.y - line->p1.y);
line->sy = line->p1.y < line->p2.y ? 1 : -1;
line->err = (line->dx > line->dy ? line->dx : -line->dy) / 2;
line->e2 = 0;
line->hor = line->dx > line->dy ? true : false; /*Rather horizontal or vertical*/
line->p_act.x = line->p1.x;
line->p_act.y = line->p1.y;
}
static bool line_next(line_draw_t * line)
{
if(line->p_act.x == line->p2.x && line->p_act.y == line->p2.y) return false;
line->e2 = line->err;
if(line->e2 > -line->dx) {
line->err -= line->dy;
line->p_act.x += line->sx;
}
if(line->e2 < line->dy) {
line->err += line->dx;
line->p_act.y += line->sy;
}
return true;
}
/**
* Iterate until step one in y direction.
* @param line
* @return
*/
static bool line_next_y(line_draw_t * line)
{
lv_coord_t last_y = line->p_act.y;
do {
if(!line_next(line)) return false;
} while(last_y == line->p_act.y);
return true;
}
/**
* Iterate until step one in x direction.
* @param line
* @return
*/
static bool line_next_x(line_draw_t * line)
{
lv_coord_t last_x = line->p_act.x;
do {
if(!line_next(line)) return false;
} while(last_x == line->p_act.x);
return true;
}
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