444 lines
15 KiB
C
444 lines
15 KiB
C
/**
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* @file lv_draw_line.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include <stdbool.h>
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#include "lv_draw_sw.h"
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#include "../../misc/lv_math.h"
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#include "../../core/lv_refr.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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LV_ATTRIBUTE_FAST_MEM static void draw_line_skew(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2);
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LV_ATTRIBUTE_FAST_MEM static void draw_line_hor(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2);
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LV_ATTRIBUTE_FAST_MEM static void draw_line_ver(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2);
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Draw a line
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* @param point1 first point of the line
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* @param point2 second point of the line
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* @param clip the line will be drawn only in this area
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* @param dsc pointer to an initialized `lv_draw_line_dsc_t` variable
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*/
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LV_ATTRIBUTE_FAST_MEM void lv_draw_sw_line(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2)
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{
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if(dsc->width == 0) return;
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if(dsc->opa <= LV_OPA_MIN) return;
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if(point1->x == point2->x && point1->y == point2->y) return;
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lv_area_t clip_line;
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clip_line.x1 = LV_MIN(point1->x, point2->x) - dsc->width / 2;
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clip_line.x2 = LV_MAX(point1->x, point2->x) + dsc->width / 2;
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clip_line.y1 = LV_MIN(point1->y, point2->y) - dsc->width / 2;
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clip_line.y2 = LV_MAX(point1->y, point2->y) + dsc->width / 2;
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bool is_common;
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is_common = _lv_area_intersect(&clip_line, &clip_line, draw_ctx->clip_area);
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if(!is_common) return;
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const lv_area_t * clip_area_ori = draw_ctx->clip_area;
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draw_ctx->clip_area = &clip_line;
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if(point1->y == point2->y) draw_line_hor(draw_ctx, dsc, point1, point2);
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else if(point1->x == point2->x) draw_line_ver(draw_ctx, dsc, point1, point2);
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else draw_line_skew(draw_ctx, dsc, point1, point2);
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if(dsc->round_end || dsc->round_start) {
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lv_draw_rect_dsc_t cir_dsc;
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lv_draw_rect_dsc_init(&cir_dsc);
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cir_dsc.bg_color = dsc->color;
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cir_dsc.radius = LV_RADIUS_CIRCLE;
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cir_dsc.bg_opa = dsc->opa;
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int32_t r = (dsc->width >> 1);
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int32_t r_corr = (dsc->width & 1) ? 0 : 1;
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lv_area_t cir_area;
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if(dsc->round_start) {
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cir_area.x1 = point1->x - r;
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cir_area.y1 = point1->y - r;
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cir_area.x2 = point1->x + r - r_corr;
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cir_area.y2 = point1->y + r - r_corr ;
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lv_draw_rect(draw_ctx, &cir_dsc, &cir_area);
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}
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if(dsc->round_end) {
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cir_area.x1 = point2->x - r;
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cir_area.y1 = point2->y - r;
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cir_area.x2 = point2->x + r - r_corr;
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cir_area.y2 = point2->y + r - r_corr ;
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lv_draw_rect(draw_ctx, &cir_dsc, &cir_area);
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}
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}
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draw_ctx->clip_area = clip_area_ori;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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LV_ATTRIBUTE_FAST_MEM static void draw_line_hor(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2)
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{
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int32_t w = dsc->width - 1;
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int32_t w_half0 = w >> 1;
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int32_t w_half1 = w_half0 + (w & 0x1); /*Compensate rounding error*/
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lv_area_t blend_area;
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blend_area.x1 = LV_MIN(point1->x, point2->x);
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blend_area.x2 = LV_MAX(point1->x, point2->x) - 1;
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blend_area.y1 = point1->y - w_half1;
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blend_area.y2 = point1->y + w_half0;
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bool is_common;
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is_common = _lv_area_intersect(&blend_area, &blend_area, draw_ctx->clip_area);
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if(!is_common) return;
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bool dashed = dsc->dash_gap && dsc->dash_width ? true : false;
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bool simple_mode = true;
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if(lv_draw_mask_is_any(&blend_area)) simple_mode = false;
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else if(dashed) simple_mode = false;
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lv_draw_sw_blend_dsc_t blend_dsc;
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lv_memset_00(&blend_dsc, sizeof(blend_dsc));
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blend_dsc.blend_area = &blend_area;
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blend_dsc.color = dsc->color;
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blend_dsc.opa = dsc->opa;
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/*If there is no mask then simply draw a rectangle*/
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if(simple_mode) {
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lv_draw_sw_blend(draw_ctx, &blend_dsc);
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}
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#if LV_DRAW_COMPLEX
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/*If there other mask apply it*/
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else {
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int32_t blend_area_w = lv_area_get_width(&blend_area);
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lv_coord_t y2 = blend_area.y2;
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blend_area.y2 = blend_area.y1;
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lv_coord_t dash_start = 0;
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if(dashed) {
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dash_start = (blend_area.x1) % (dsc->dash_gap + dsc->dash_width);
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}
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lv_opa_t * mask_buf = lv_mem_buf_get(blend_area_w);
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blend_dsc.mask_buf = mask_buf;
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blend_dsc.mask_area = &blend_area;
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int32_t h;
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for(h = blend_area.y1; h <= y2; h++) {
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lv_memset_ff(mask_buf, blend_area_w);
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blend_dsc.mask_res = lv_draw_mask_apply(mask_buf, blend_area.x1, h, blend_area_w);
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if(dashed) {
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if(blend_dsc.mask_res != LV_DRAW_MASK_RES_TRANSP) {
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lv_coord_t dash_cnt = dash_start;
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lv_coord_t i;
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for(i = 0; i < blend_area_w; i++, dash_cnt++) {
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if(dash_cnt <= dsc->dash_width) {
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int16_t diff = dsc->dash_width - dash_cnt;
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i += diff;
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dash_cnt += diff;
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}
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else if(dash_cnt >= dsc->dash_gap + dsc->dash_width) {
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dash_cnt = 0;
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}
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else {
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mask_buf[i] = 0x00;
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}
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}
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blend_dsc.mask_res = LV_DRAW_MASK_RES_CHANGED;
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}
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}
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lv_draw_sw_blend(draw_ctx, &blend_dsc);
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blend_area.y1++;
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blend_area.y2++;
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}
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lv_mem_buf_release(mask_buf);
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}
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#endif /*LV_DRAW_COMPLEX*/
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}
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LV_ATTRIBUTE_FAST_MEM static void draw_line_ver(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2)
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{
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int32_t w = dsc->width - 1;
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int32_t w_half0 = w >> 1;
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int32_t w_half1 = w_half0 + (w & 0x1); /*Compensate rounding error*/
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lv_area_t blend_area;
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blend_area.x1 = point1->x - w_half1;
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blend_area.x2 = point1->x + w_half0;
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blend_area.y1 = LV_MIN(point1->y, point2->y);
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blend_area.y2 = LV_MAX(point1->y, point2->y) - 1;
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bool is_common;
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is_common = _lv_area_intersect(&blend_area, &blend_area, draw_ctx->clip_area);
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if(!is_common) return;
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bool dashed = dsc->dash_gap && dsc->dash_width ? true : false;
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bool simple_mode = true;
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if(lv_draw_mask_is_any(&blend_area)) simple_mode = false;
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else if(dashed) simple_mode = false;
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lv_draw_sw_blend_dsc_t blend_dsc;
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lv_memset_00(&blend_dsc, sizeof(blend_dsc));
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blend_dsc.blend_area = &blend_area;
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blend_dsc.color = dsc->color;
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blend_dsc.opa = dsc->opa;
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/*If there is no mask then simply draw a rectangle*/
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if(simple_mode) {
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lv_draw_sw_blend(draw_ctx, &blend_dsc);
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}
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#if LV_DRAW_COMPLEX
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/*If there other mask apply it*/
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else {
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int32_t draw_area_w = lv_area_get_width(&blend_area);
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lv_coord_t y2 = blend_area.y2;
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blend_area.y2 = blend_area.y1;
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lv_opa_t * mask_buf = lv_mem_buf_get(draw_area_w);
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blend_dsc.mask_buf = mask_buf;
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blend_dsc.mask_area = &blend_area;
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lv_coord_t dash_start = 0;
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if(dashed) {
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dash_start = (blend_area.y1) % (dsc->dash_gap + dsc->dash_width);
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}
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lv_coord_t dash_cnt = dash_start;
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int32_t h;
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for(h = blend_area.y1; h <= y2; h++) {
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lv_memset_ff(mask_buf, draw_area_w);
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blend_dsc.mask_res = lv_draw_mask_apply(mask_buf, blend_area.x1, h, draw_area_w);
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if(dashed) {
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if(blend_dsc.mask_res != LV_DRAW_MASK_RES_TRANSP) {
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if(dash_cnt > dsc->dash_width) {
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blend_dsc.mask_res = LV_DRAW_MASK_RES_TRANSP;
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}
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if(dash_cnt >= dsc->dash_gap + dsc->dash_width) {
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dash_cnt = 0;
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}
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}
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dash_cnt ++;
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}
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lv_draw_sw_blend(draw_ctx, &blend_dsc);
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blend_area.y1++;
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blend_area.y2++;
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}
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lv_mem_buf_release(mask_buf);
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}
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#endif /*LV_DRAW_COMPLEX*/
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}
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LV_ATTRIBUTE_FAST_MEM static void draw_line_skew(struct _lv_draw_ctx_t * draw_ctx, const lv_draw_line_dsc_t * dsc,
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const lv_point_t * point1, const lv_point_t * point2)
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{
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#if LV_DRAW_COMPLEX
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/*Keep the great y in p1*/
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lv_point_t p1;
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lv_point_t p2;
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if(point1->y < point2->y) {
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p1.y = point1->y;
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p2.y = point2->y;
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p1.x = point1->x;
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p2.x = point2->x;
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}
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else {
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p1.y = point2->y;
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p2.y = point1->y;
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p1.x = point2->x;
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p2.x = point1->x;
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}
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int32_t xdiff = p2.x - p1.x;
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int32_t ydiff = p2.y - p1.y;
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bool flat = LV_ABS(xdiff) > LV_ABS(ydiff) ? true : false;
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static const uint8_t wcorr[] = {
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128, 128, 128, 129, 129, 130, 130, 131,
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132, 133, 134, 135, 137, 138, 140, 141,
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143, 145, 147, 149, 151, 153, 155, 158,
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160, 162, 165, 167, 170, 173, 175, 178,
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181,
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};
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int32_t w = dsc->width;
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int32_t wcorr_i = 0;
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if(flat) wcorr_i = (LV_ABS(ydiff) << 5) / LV_ABS(xdiff);
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else wcorr_i = (LV_ABS(xdiff) << 5) / LV_ABS(ydiff);
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w = (w * wcorr[wcorr_i] + 63) >> 7; /*+ 63 for rounding*/
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int32_t w_half0 = w >> 1;
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int32_t w_half1 = w_half0 + (w & 0x1); /*Compensate rounding error*/
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lv_area_t blend_area;
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blend_area.x1 = LV_MIN(p1.x, p2.x) - w;
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blend_area.x2 = LV_MAX(p1.x, p2.x) + w;
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blend_area.y1 = LV_MIN(p1.y, p2.y) - w;
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blend_area.y2 = LV_MAX(p1.y, p2.y) + w;
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/*Get the union of `coords` and `clip`*/
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/*`clip` is already truncated to the `draw_buf` size
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*in 'lv_refr_area' function*/
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bool is_common = _lv_area_intersect(&blend_area, &blend_area, draw_ctx->clip_area);
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if(is_common == false) return;
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lv_draw_mask_line_param_t mask_left_param;
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lv_draw_mask_line_param_t mask_right_param;
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lv_draw_mask_line_param_t mask_top_param;
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lv_draw_mask_line_param_t mask_bottom_param;
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if(flat) {
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if(xdiff > 0) {
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lv_draw_mask_line_points_init(&mask_left_param, p1.x, p1.y - w_half0, p2.x, p2.y - w_half0,
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LV_DRAW_MASK_LINE_SIDE_LEFT);
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lv_draw_mask_line_points_init(&mask_right_param, p1.x, p1.y + w_half1, p2.x, p2.y + w_half1,
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LV_DRAW_MASK_LINE_SIDE_RIGHT);
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}
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else {
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lv_draw_mask_line_points_init(&mask_left_param, p1.x, p1.y + w_half1, p2.x, p2.y + w_half1,
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LV_DRAW_MASK_LINE_SIDE_LEFT);
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lv_draw_mask_line_points_init(&mask_right_param, p1.x, p1.y - w_half0, p2.x, p2.y - w_half0,
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LV_DRAW_MASK_LINE_SIDE_RIGHT);
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}
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}
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else {
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lv_draw_mask_line_points_init(&mask_left_param, p1.x + w_half1, p1.y, p2.x + w_half1, p2.y,
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LV_DRAW_MASK_LINE_SIDE_LEFT);
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lv_draw_mask_line_points_init(&mask_right_param, p1.x - w_half0, p1.y, p2.x - w_half0, p2.y,
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LV_DRAW_MASK_LINE_SIDE_RIGHT);
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}
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/*Use the normal vector for the endings*/
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int16_t mask_left_id = lv_draw_mask_add(&mask_left_param, NULL);
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int16_t mask_right_id = lv_draw_mask_add(&mask_right_param, NULL);
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int16_t mask_top_id = LV_MASK_ID_INV;
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int16_t mask_bottom_id = LV_MASK_ID_INV;
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if(!dsc->raw_end) {
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lv_draw_mask_line_points_init(&mask_top_param, p1.x, p1.y, p1.x - ydiff, p1.y + xdiff, LV_DRAW_MASK_LINE_SIDE_BOTTOM);
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lv_draw_mask_line_points_init(&mask_bottom_param, p2.x, p2.y, p2.x - ydiff, p2.y + xdiff, LV_DRAW_MASK_LINE_SIDE_TOP);
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mask_top_id = lv_draw_mask_add(&mask_top_param, NULL);
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mask_bottom_id = lv_draw_mask_add(&mask_bottom_param, NULL);
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}
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/*The real draw area is around the line.
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*It's easy to calculate with steep lines, but the area can be very wide with very flat lines.
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*So deal with it only with steep lines.*/
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int32_t draw_area_w = lv_area_get_width(&blend_area);
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/*Draw the background line by line*/
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int32_t h;
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uint32_t hor_res = (uint32_t)lv_disp_get_hor_res(_lv_refr_get_disp_refreshing());
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size_t mask_buf_size = LV_MIN(lv_area_get_size(&blend_area), hor_res);
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lv_opa_t * mask_buf = lv_mem_buf_get(mask_buf_size);
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lv_coord_t y2 = blend_area.y2;
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blend_area.y2 = blend_area.y1;
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uint32_t mask_p = 0;
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lv_memset_ff(mask_buf, mask_buf_size);
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lv_draw_sw_blend_dsc_t blend_dsc;
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lv_memset_00(&blend_dsc, sizeof(blend_dsc));
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blend_dsc.blend_area = &blend_area;
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blend_dsc.color = dsc->color;
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blend_dsc.opa = dsc->opa;
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blend_dsc.mask_buf = mask_buf;
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blend_dsc.mask_area = &blend_area;
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/*Fill the first row with 'color'*/
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for(h = blend_area.y1; h <= y2; h++) {
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blend_dsc.mask_res = lv_draw_mask_apply(&mask_buf[mask_p], blend_area.x1, h, draw_area_w);
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if(blend_dsc.mask_res == LV_DRAW_MASK_RES_TRANSP) {
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lv_memset_00(&mask_buf[mask_p], draw_area_w);
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}
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mask_p += draw_area_w;
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if((uint32_t) mask_p + draw_area_w < mask_buf_size) {
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blend_area.y2 ++;
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}
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else {
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blend_dsc.mask_res = LV_DRAW_MASK_RES_CHANGED;
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lv_draw_sw_blend(draw_ctx, &blend_dsc);
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blend_area.y1 = blend_area.y2 + 1;
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blend_area.y2 = blend_area.y1;
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mask_p = 0;
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|
lv_memset_ff(mask_buf, mask_buf_size);
|
|
}
|
|
}
|
|
|
|
/*Flush the last part*/
|
|
if(blend_area.y1 != blend_area.y2) {
|
|
blend_area.y2--;
|
|
blend_dsc.mask_res = LV_DRAW_MASK_RES_CHANGED;
|
|
lv_draw_sw_blend(draw_ctx, &blend_dsc);
|
|
}
|
|
|
|
lv_mem_buf_release(mask_buf);
|
|
|
|
lv_draw_mask_free_param(&mask_left_param);
|
|
lv_draw_mask_free_param(&mask_right_param);
|
|
if(mask_top_id != LV_MASK_ID_INV) lv_draw_mask_free_param(&mask_top_param);
|
|
if(mask_bottom_id != LV_MASK_ID_INV) lv_draw_mask_free_param(&mask_bottom_param);
|
|
lv_draw_mask_remove_id(mask_left_id);
|
|
lv_draw_mask_remove_id(mask_right_id);
|
|
lv_draw_mask_remove_id(mask_top_id);
|
|
lv_draw_mask_remove_id(mask_bottom_id);
|
|
#else
|
|
LV_UNUSED(point1);
|
|
LV_UNUSED(point2);
|
|
LV_UNUSED(draw_ctx);
|
|
LV_UNUSED(dsc);
|
|
LV_LOG_WARN("Can't draw skewed line with LV_DRAW_COMPLEX == 0");
|
|
#endif /*LV_DRAW_COMPLEX*/
|
|
}
|
|
|