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fb: cfb: Add cfb_draw_line() API

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Add cfb_draw_line() API for rendering line.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>
This commit is contained in:
TOKITA Hiroshi 2023-04-13 07:38:47 +09:00 committed by Anas Nashif
parent 39c8288bab
commit ea42b0dc9d
2 changed files with 52 additions and 0 deletions
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12
include/zephyr/display/cfb.h
View File

@ -119,6 +119,18 @@ int cfb_draw_text(const struct device *dev, const char *const str, int16_t x, in
*/
int cfb_draw_point(const struct device *dev, const struct cfb_position *pos);
/**
* @brief Draw a line.
*
* @param dev Pointer to device structure for driver instance
* @param start start position of the line
* @param end end position of the line
*
* @return 0 on success, negative value otherwise
*/
int cfb_draw_line(const struct device *dev, const struct cfb_position *start,
const struct cfb_position *end);
/**
* @brief Clear framebuffer.
*

40
subsys/fb/cfb.c
View File

@ -204,6 +204,36 @@ static inline void draw_point(struct char_framebuffer *fb, int16_t x, int16_t y)
fb->buf[index + x] |= m;
}
static void draw_line(struct char_framebuffer *fb, int16_t x0, int16_t y0, int16_t x1, int16_t y1)
{
int16_t sx = (x0 < x1) ? 1 : -1;
int16_t sy = (y0 < y1) ? 1 : -1;
int16_t dx = (sx > 0) ? (x1 - x0) : (x0 - x1);
int16_t dy = (sy > 0) ? (y0 - y1) : (y1 - y0);
int16_t err = dx + dy;
int16_t e2;
while (true) {
draw_point(fb, x0, y0);
if (x0 == x1 && y0 == y1) {
break;
}
e2 = 2 * err;
if (e2 >= dy) {
err += dy;
x0 += sx;
}
if (e2 <= dx) {
err += dx;
y0 += sy;
}
}
}
static int draw_text(const struct device *dev, const char *const str, int16_t x, int16_t y,
bool wrap)
{
@ -245,6 +275,16 @@ int cfb_draw_point(const struct device *dev, const struct cfb_position *pos)
return 0;
}
int cfb_draw_line(const struct device *dev, const struct cfb_position *start,
const struct cfb_position *end)
{
struct char_framebuffer *fb = &char_fb;
draw_line(fb, start->x, start->y, end->x, end->y);
return 0;
}
int cfb_draw_text(const struct device *dev, const char *const str, int16_t x, int16_t y)
{
return draw_text(dev, str, x, y, false);