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lvgl_cpp/lvgl/widgets/lv_canvas.c

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v0.1
2023-03-14 11:57:25 +00:00
/**
* @file lv_canvas.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_canvas.h"
#include "../misc/lv_assert.h"
#include "../misc/lv_math.h"
#include "../draw/lv_draw.h"
#include "../core/lv_refr.h"
#if LV_USE_CANVAS != 0
#include "../draw/sw/lv_draw_sw.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS &lv_canvas_class
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_canvas_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void init_fake_disp(lv_obj_t * canvas, lv_disp_t * disp, lv_disp_drv_t * drv, lv_area_t * clip_area);
static void deinit_fake_disp(lv_obj_t * canvas, lv_disp_t * disp);
/**********************
* STATIC VARIABLES
**********************/
const lv_obj_class_t lv_canvas_class = {
.constructor_cb = lv_canvas_constructor,
.destructor_cb = lv_canvas_destructor,
.instance_size = sizeof(lv_canvas_t),
.base_class = &lv_img_class
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_obj_t * lv_canvas_create(lv_obj_t * parent)
{
LV_LOG_INFO("begin");
lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
lv_obj_class_init_obj(obj);
return obj;
}
/*=====================
* Setter functions
*====================*/
void lv_canvas_set_buffer(lv_obj_t * obj, void * buf, lv_coord_t w, lv_coord_t h, lv_img_cf_t cf)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(buf);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
canvas->dsc.header.cf = cf;
canvas->dsc.header.w = w;
canvas->dsc.header.h = h;
canvas->dsc.data = buf;
lv_img_set_src(obj, &canvas->dsc);
}
void lv_canvas_set_px_color(lv_obj_t * obj, lv_coord_t x, lv_coord_t y, lv_color_t c)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_img_buf_set_px_color(&canvas->dsc, x, y, c);
lv_obj_invalidate(obj);
}
void lv_canvas_set_px_opa(lv_obj_t * obj, lv_coord_t x, lv_coord_t y, lv_opa_t opa)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_img_buf_set_px_alpha(&canvas->dsc, x, y, opa);
lv_obj_invalidate(obj);
}
void lv_canvas_set_palette(lv_obj_t * obj, uint8_t id, lv_color_t c)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_img_buf_set_palette(&canvas->dsc, id, c);
lv_obj_invalidate(obj);
}
/*=====================
* Getter functions
*====================*/
lv_color_t lv_canvas_get_px(lv_obj_t * obj, lv_coord_t x, lv_coord_t y)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_color_t color = lv_obj_get_style_img_recolor(obj, LV_PART_MAIN);
return lv_img_buf_get_px_color(&canvas->dsc, x, y, color);
}
lv_img_dsc_t * lv_canvas_get_img(lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
return &canvas->dsc;
}
/*=====================
* Other functions
*====================*/
void lv_canvas_copy_buf(lv_obj_t * obj, const void * to_copy, lv_coord_t x, lv_coord_t y, lv_coord_t w, lv_coord_t h)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(to_copy);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
if(x + w - 1 >= (lv_coord_t)canvas->dsc.header.w || y + h - 1 >= (lv_coord_t)canvas->dsc.header.h) {
LV_LOG_WARN("lv_canvas_copy_buf: x or y out of the canvas");
return;
}
uint32_t px_size = lv_img_cf_get_px_size(canvas->dsc.header.cf) >> 3;
uint32_t px = canvas->dsc.header.w * y * px_size + x * px_size;
uint8_t * to_copy8 = (uint8_t *)to_copy;
lv_coord_t i;
for(i = 0; i < h; i++) {
lv_memcpy((void *)&canvas->dsc.data[px], to_copy8, w * px_size);
px += canvas->dsc.header.w * px_size;
to_copy8 += w * px_size;
}
}
void lv_canvas_transform(lv_obj_t * obj, lv_img_dsc_t * img, int16_t angle, uint16_t zoom, lv_coord_t offset_x,
lv_coord_t offset_y,
int32_t pivot_x, int32_t pivot_y, bool antialias)
{
#if LV_DRAW_COMPLEX
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(img);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_color_t color = lv_obj_get_style_img_recolor(obj, LV_PART_MAIN);
int32_t dest_width = canvas->dsc.header.w;
int32_t dest_height = canvas->dsc.header.h;
int32_t x;
int32_t y;
bool ret;
lv_img_transform_dsc_t dsc;
dsc.cfg.angle = angle;
dsc.cfg.zoom = zoom;
dsc.cfg.src = img->data;
dsc.cfg.src_w = img->header.w;
dsc.cfg.src_h = img->header.h;
dsc.cfg.cf = img->header.cf;
dsc.cfg.pivot_x = pivot_x;
dsc.cfg.pivot_y = pivot_y;
dsc.cfg.color = color;
dsc.cfg.antialias = antialias;
_lv_img_buf_transform_init(&dsc);
for(y = -offset_y; y < dest_height - offset_y; y++) {
for(x = -offset_x; x < dest_width - offset_x; x++) {
ret = _lv_img_buf_transform(&dsc, x, y);
if(ret == false) continue;
if(x + offset_x >= 0 && x + offset_x < dest_width && y + offset_y >= 0 && y + offset_y < dest_height) {
/*If the image has no alpha channel just simple set the result color on the canvas*/
if(lv_img_cf_has_alpha(img->header.cf) == false) {
lv_img_buf_set_px_color(&canvas->dsc, x + offset_x, y + offset_y, dsc.res.color);
}
else {
lv_color_t bg_color = lv_img_buf_get_px_color(&canvas->dsc, x + offset_x, y + offset_y, dsc.cfg.color);
/*If the canvas has no alpha but the image has mix the image's color with
* canvas*/
if(lv_img_cf_has_alpha(canvas->dsc.header.cf) == false) {
if(dsc.res.opa < LV_OPA_MAX) dsc.res.color = lv_color_mix(dsc.res.color, bg_color, dsc.res.opa);
lv_img_buf_set_px_color(&canvas->dsc, x + offset_x, y + offset_y, dsc.res.color);
}
/*Both the image and canvas has alpha channel. Some extra calculation is
required*/
else {
lv_opa_t bg_opa = lv_img_buf_get_px_alpha(&canvas->dsc, x + offset_x, y + offset_y);
/*Pick the foreground if it's fully opaque or the Background is fully
*transparent*/
if(dsc.res.opa >= LV_OPA_MAX || bg_opa <= LV_OPA_MIN) {
lv_img_buf_set_px_color(&canvas->dsc, x + offset_x, y + offset_y, dsc.res.color);
lv_img_buf_set_px_alpha(&canvas->dsc, x + offset_x, y + offset_y, dsc.res.opa);
}
/*Opaque background: use simple mix*/
else if(bg_opa >= LV_OPA_MAX) {
lv_img_buf_set_px_color(&canvas->dsc, x + offset_x, y + offset_y,
lv_color_mix(dsc.res.color, bg_color, dsc.res.opa));
}
/*Both colors have alpha. Expensive calculation need to be applied*/
else {
/*Info:
* https://en.wikipedia.org/wiki/Alpha_compositing#Analytical_derivation_of_the_over_operator*/
lv_opa_t opa_res_2 = 255 - ((uint16_t)((uint16_t)(255 - dsc.res.opa) * (255 - bg_opa)) >> 8);
if(opa_res_2 == 0) {
opa_res_2 = 1; /*never happens, just to be sure*/
}
lv_opa_t ratio = (uint16_t)((uint16_t)dsc.res.opa * 255) / opa_res_2;
lv_img_buf_set_px_color(&canvas->dsc, x + offset_x, y + offset_y,
lv_color_mix(dsc.res.color, bg_color, ratio));
lv_img_buf_set_px_alpha(&canvas->dsc, x + offset_x, y + offset_y, opa_res_2);
}
}
}
}
}
}
lv_obj_invalidate(obj);
#else
LV_UNUSED(obj);
LV_UNUSED(img);
LV_UNUSED(angle);
LV_UNUSED(zoom);
LV_UNUSED(offset_x);
LV_UNUSED(offset_y);
LV_UNUSED(pivot_x);
LV_UNUSED(pivot_y);
LV_UNUSED(antialias);
LV_LOG_WARN("Can't transform canvas with LV_DRAW_COMPLEX == 0");
#endif
}
void lv_canvas_blur_hor(lv_obj_t * obj, const lv_area_t * area, uint16_t r)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
if(r == 0) return;
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_area_t a;
if(area) {
lv_area_copy(&a, area);
if(a.x1 < 0) a.x1 = 0;
if(a.y1 < 0) a.y1 = 0;
if(a.x2 > canvas->dsc.header.w - 1) a.x2 = canvas->dsc.header.w - 1;
if(a.y2 > canvas->dsc.header.h - 1) a.y2 = canvas->dsc.header.h - 1;
}
else {
a.x1 = 0;
a.y1 = 0;
a.x2 = canvas->dsc.header.w - 1;
a.y2 = canvas->dsc.header.h - 1;
}
lv_color_t color = lv_obj_get_style_img_recolor(obj, LV_PART_MAIN);
uint16_t r_back = r / 2;
uint16_t r_front = r / 2;
if((r & 0x1) == 0) r_back--;
bool has_alpha = lv_img_cf_has_alpha(canvas->dsc.header.cf);
lv_coord_t line_w = lv_img_buf_get_img_size(canvas->dsc.header.w, 1, canvas->dsc.header.cf);
uint8_t * line_buf = lv_mem_buf_get(line_w);
lv_img_dsc_t line_img;
line_img.data = line_buf;
line_img.header.always_zero = 0;
line_img.header.w = canvas->dsc.header.w;
line_img.header.h = 1;
line_img.header.cf = canvas->dsc.header.cf;
lv_coord_t x;
lv_coord_t y;
lv_coord_t x_safe;
for(y = a.y1; y <= a.y2; y++) {
uint32_t asum = 0;
uint32_t rsum = 0;
uint32_t gsum = 0;
uint32_t bsum = 0;
lv_color_t c;
lv_opa_t opa = LV_OPA_TRANSP;
lv_memcpy(line_buf, &canvas->dsc.data[y * line_w], line_w);
for(x = a.x1 - r_back; x <= a.x1 + r_front; x++) {
x_safe = x < 0 ? 0 : x;
x_safe = x_safe > canvas->dsc.header.w - 1 ? canvas->dsc.header.w - 1 : x_safe;
c = lv_img_buf_get_px_color(&line_img, x_safe, 0, color);
if(has_alpha) opa = lv_img_buf_get_px_alpha(&line_img, x_safe, 0);
rsum += c.ch.red;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
gsum += (c.ch.green_h << 3) + c.ch.green_l;
#else
gsum += c.ch.green;
#endif
bsum += c.ch.blue;
if(has_alpha) asum += opa;
}
/*Just to indicate that the px is visible*/
if(has_alpha == false) asum = LV_OPA_COVER;
for(x = a.x1; x <= a.x2; x++) {
if(asum) {
c.ch.red = rsum / r;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
uint8_t gtmp = gsum / r;
c.ch.green_h = gtmp >> 3;
c.ch.green_l = gtmp & 0x7;
#else
c.ch.green = gsum / r;
#endif
c.ch.blue = bsum / r;
if(has_alpha) opa = asum / r;
lv_img_buf_set_px_color(&canvas->dsc, x, y, c);
}
if(has_alpha) lv_img_buf_set_px_alpha(&canvas->dsc, x, y, opa);
x_safe = x - r_back;
x_safe = x_safe < 0 ? 0 : x_safe;
c = lv_img_buf_get_px_color(&line_img, x_safe, 0, color);
if(has_alpha) opa = lv_img_buf_get_px_alpha(&line_img, x_safe, 0);
rsum -= c.ch.red;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
gsum -= (c.ch.green_h << 3) + c.ch.green_l;
#else
gsum -= c.ch.green;
#endif
bsum -= c.ch.blue;
if(has_alpha) asum -= opa;
x_safe = x + 1 + r_front;
x_safe = x_safe > canvas->dsc.header.w - 1 ? canvas->dsc.header.w - 1 : x_safe;
c = lv_img_buf_get_px_color(&line_img, x_safe, 0, lv_color_white());
if(has_alpha) opa = lv_img_buf_get_px_alpha(&line_img, x_safe, 0);
rsum += c.ch.red;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
gsum += (c.ch.green_h << 3) + c.ch.green_l;
#else
gsum += c.ch.green;
#endif
bsum += c.ch.blue;
if(has_alpha) asum += opa;
}
}
lv_obj_invalidate(obj);
lv_mem_buf_release(line_buf);
}
void lv_canvas_blur_ver(lv_obj_t * obj, const lv_area_t * area, uint16_t r)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
if(r == 0) return;
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_area_t a;
if(area) {
lv_area_copy(&a, area);
if(a.x1 < 0) a.x1 = 0;
if(a.y1 < 0) a.y1 = 0;
if(a.x2 > canvas->dsc.header.w - 1) a.x2 = canvas->dsc.header.w - 1;
if(a.y2 > canvas->dsc.header.h - 1) a.y2 = canvas->dsc.header.h - 1;
}
else {
a.x1 = 0;
a.y1 = 0;
a.x2 = canvas->dsc.header.w - 1;
a.y2 = canvas->dsc.header.h - 1;
}
lv_color_t color = lv_obj_get_style_img_recolor(obj, LV_PART_MAIN);
uint16_t r_back = r / 2;
uint16_t r_front = r / 2;
if((r & 0x1) == 0) r_back--;
bool has_alpha = lv_img_cf_has_alpha(canvas->dsc.header.cf);
lv_coord_t col_w = lv_img_buf_get_img_size(1, canvas->dsc.header.h, canvas->dsc.header.cf);
uint8_t * col_buf = lv_mem_buf_get(col_w);
lv_img_dsc_t line_img;
line_img.data = col_buf;
line_img.header.always_zero = 0;
line_img.header.w = 1;
line_img.header.h = canvas->dsc.header.h;
line_img.header.cf = canvas->dsc.header.cf;
lv_coord_t x;
lv_coord_t y;
lv_coord_t y_safe;
for(x = a.x1; x <= a.x2; x++) {
uint32_t asum = 0;
uint32_t rsum = 0;
uint32_t gsum = 0;
uint32_t bsum = 0;
lv_color_t c;
lv_opa_t opa = LV_OPA_COVER;
for(y = a.y1 - r_back; y <= a.y1 + r_front; y++) {
y_safe = y < 0 ? 0 : y;
y_safe = y_safe > canvas->dsc.header.h - 1 ? canvas->dsc.header.h - 1 : y_safe;
c = lv_img_buf_get_px_color(&canvas->dsc, x, y_safe, color);
if(has_alpha) opa = lv_img_buf_get_px_alpha(&canvas->dsc, x, y_safe);
lv_img_buf_set_px_color(&line_img, 0, y_safe, c);
if(has_alpha) lv_img_buf_set_px_alpha(&line_img, 0, y_safe, opa);
rsum += c.ch.red;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
gsum += (c.ch.green_h << 3) + c.ch.green_l;
#else
gsum += c.ch.green;
#endif
bsum += c.ch.blue;
if(has_alpha) asum += opa;
}
/*Just to indicate that the px is visible*/
if(has_alpha == false) asum = LV_OPA_COVER;
for(y = a.y1; y <= a.y2; y++) {
if(asum) {
c.ch.red = rsum / r;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
uint8_t gtmp = gsum / r;
c.ch.green_h = gtmp >> 3;
c.ch.green_l = gtmp & 0x7;
#else
c.ch.green = gsum / r;
#endif
c.ch.blue = bsum / r;
if(has_alpha) opa = asum / r;
lv_img_buf_set_px_color(&canvas->dsc, x, y, c);
}
if(has_alpha) lv_img_buf_set_px_alpha(&canvas->dsc, x, y, opa);
y_safe = y - r_back;
y_safe = y_safe < 0 ? 0 : y_safe;
c = lv_img_buf_get_px_color(&line_img, 0, y_safe, color);
if(has_alpha) opa = lv_img_buf_get_px_alpha(&line_img, 0, y_safe);
rsum -= c.ch.red;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
gsum -= (c.ch.green_h << 3) + c.ch.green_l;
#else
gsum -= c.ch.green;
#endif
bsum -= c.ch.blue;
if(has_alpha) asum -= opa;
y_safe = y + 1 + r_front;
y_safe = y_safe > canvas->dsc.header.h - 1 ? canvas->dsc.header.h - 1 : y_safe;
c = lv_img_buf_get_px_color(&canvas->dsc, x, y_safe, color);
if(has_alpha) opa = lv_img_buf_get_px_alpha(&canvas->dsc, x, y_safe);
lv_img_buf_set_px_color(&line_img, 0, y_safe, c);
if(has_alpha) lv_img_buf_set_px_alpha(&line_img, 0, y_safe, opa);
rsum += c.ch.red;
#if LV_COLOR_DEPTH == 16 && LV_COLOR_16_SWAP
gsum += (c.ch.green_h << 3) + c.ch.green_l;
#else
gsum += c.ch.green;
#endif
bsum += c.ch.blue;
if(has_alpha) asum += opa;
}
}
lv_obj_invalidate(obj);
lv_mem_buf_release(col_buf);
}
void lv_canvas_fill_bg(lv_obj_t * canvas, lv_color_t color, lv_opa_t opa)
{
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf == LV_IMG_CF_INDEXED_1BIT) {
uint32_t row_byte_cnt = (dsc->header.w + 7) >> 3;
/*+8 skip the palette*/
lv_memset((uint8_t *)dsc->data + 8, color.full ? 0xff : 0x00, row_byte_cnt * dsc->header.h);
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT) {
uint32_t row_byte_cnt = (dsc->header.w + 7) >> 3;
lv_memset((uint8_t *)dsc->data, opa > LV_OPA_50 ? 0xff : 0x00, row_byte_cnt * dsc->header.h);
}
else {
uint32_t x;
uint32_t y;
for(y = 0; y < dsc->header.h; y++) {
for(x = 0; x < dsc->header.w; x++) {
lv_img_buf_set_px_color(dsc, x, y, color);
lv_img_buf_set_px_alpha(dsc, x, y, opa);
}
}
}
lv_obj_invalidate(canvas);
}
void lv_canvas_draw_rect(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t w, lv_coord_t h,
const lv_draw_rect_dsc_t * draw_dsc)
{
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf >= LV_IMG_CF_INDEXED_1BIT && dsc->header.cf <= LV_IMG_CF_INDEXED_8BIT) {
LV_LOG_WARN("lv_canvas_draw_rect: can't draw to LV_IMG_CF_INDEXED canvas");
return;
}
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_disp_t fake_disp;
lv_disp_drv_t driver;
lv_area_t clip_area;
init_fake_disp(canvas, &fake_disp, &driver, &clip_area);
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
_lv_refr_set_disp_refreshing(&fake_disp);
/*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
lv_color_t ctransp = LV_COLOR_CHROMA_KEY;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
draw_dsc->bg_color.full == ctransp.full) {
fake_disp.driver->antialiasing = 0;
}
lv_area_t coords;
coords.x1 = x;
coords.y1 = y;
coords.x2 = x + w - 1;
coords.y2 = y + h - 1;
lv_draw_rect(driver.draw_ctx, draw_dsc, &coords);
_lv_refr_set_disp_refreshing(refr_ori);
deinit_fake_disp(canvas, &fake_disp);
lv_obj_invalidate(canvas);
}
void lv_canvas_draw_text(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t max_w,
lv_draw_label_dsc_t * draw_dsc, const char * txt)
{
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf >= LV_IMG_CF_INDEXED_1BIT && dsc->header.cf <= LV_IMG_CF_INDEXED_8BIT) {
LV_LOG_WARN("lv_canvas_draw_text: can't draw to LV_IMG_CF_INDEXED canvas");
return;
}
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_disp_t fake_disp;
lv_disp_drv_t driver;
lv_area_t clip_area;
init_fake_disp(canvas, &fake_disp, &driver, &clip_area);
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
_lv_refr_set_disp_refreshing(&fake_disp);
lv_area_t coords;
coords.x1 = x;
coords.y1 = y;
coords.x2 = x + max_w - 1;
coords.y2 = dsc->header.h - 1;
lv_draw_label(driver.draw_ctx, draw_dsc, &coords, txt, NULL);
_lv_refr_set_disp_refreshing(refr_ori);
deinit_fake_disp(canvas, &fake_disp);
lv_obj_invalidate(canvas);
}
void lv_canvas_draw_img(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, const void * src,
const lv_draw_img_dsc_t * draw_dsc)
{
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf >= LV_IMG_CF_INDEXED_1BIT && dsc->header.cf <= LV_IMG_CF_INDEXED_8BIT) {
LV_LOG_WARN("lv_canvas_draw_img: can't draw to LV_IMG_CF_INDEXED canvas");
return;
}
lv_img_header_t header;
lv_res_t res = lv_img_decoder_get_info(src, &header);
if(res != LV_RES_OK) {
LV_LOG_WARN("lv_canvas_draw_img: Couldn't get the image data.");
return;
}
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_disp_t fake_disp;
lv_disp_drv_t driver;
lv_area_t clip_area;
init_fake_disp(canvas, &fake_disp, &driver, &clip_area);
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
_lv_refr_set_disp_refreshing(&fake_disp);
lv_area_t coords;
coords.x1 = x;
coords.y1 = y;
coords.x2 = x + header.w - 1;
coords.y2 = y + header.h - 1;
lv_draw_img(driver.draw_ctx, draw_dsc, &coords, src);
_lv_refr_set_disp_refreshing(refr_ori);
deinit_fake_disp(canvas, &fake_disp);
lv_obj_invalidate(canvas);
}
void lv_canvas_draw_line(lv_obj_t * canvas, const lv_point_t points[], uint32_t point_cnt,
const lv_draw_line_dsc_t * draw_dsc)
{
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf >= LV_IMG_CF_INDEXED_1BIT && dsc->header.cf <= LV_IMG_CF_INDEXED_8BIT) {
LV_LOG_WARN("lv_canvas_draw_line: can't draw to LV_IMG_CF_INDEXED canvas");
return;
}
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_disp_t fake_disp;
lv_disp_drv_t driver;
lv_area_t clip_area;
init_fake_disp(canvas, &fake_disp, &driver, &clip_area);
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
_lv_refr_set_disp_refreshing(&fake_disp);
/*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
lv_color_t ctransp = LV_COLOR_CHROMA_KEY;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
draw_dsc->color.full == ctransp.full) {
fake_disp.driver->antialiasing = 0;
}
uint32_t i;
for(i = 0; i < point_cnt - 1; i++) {
lv_draw_line(driver.draw_ctx, draw_dsc, &points[i], &points[i + 1]);
}
_lv_refr_set_disp_refreshing(refr_ori);
deinit_fake_disp(canvas, &fake_disp);
lv_obj_invalidate(canvas);
}
void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t points[], uint32_t point_cnt,
const lv_draw_rect_dsc_t * draw_dsc)
{
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf >= LV_IMG_CF_INDEXED_1BIT && dsc->header.cf <= LV_IMG_CF_INDEXED_8BIT) {
LV_LOG_WARN("lv_canvas_draw_polygon: can't draw to LV_IMG_CF_INDEXED canvas");
return;
}
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_disp_t fake_disp;
lv_disp_drv_t driver;
lv_area_t clip_area;
init_fake_disp(canvas, &fake_disp, &driver, &clip_area);
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
_lv_refr_set_disp_refreshing(&fake_disp);
/*Disable anti-aliasing if drawing with transparent color to chroma keyed canvas*/
lv_color_t ctransp = LV_COLOR_CHROMA_KEY;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED &&
draw_dsc->bg_color.full == ctransp.full) {
fake_disp.driver->antialiasing = 0;
}
lv_draw_polygon(driver.draw_ctx, draw_dsc, points, point_cnt);
_lv_refr_set_disp_refreshing(refr_ori);
deinit_fake_disp(canvas, &fake_disp);
lv_obj_invalidate(canvas);
}
void lv_canvas_draw_arc(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_coord_t r, int32_t start_angle,
int32_t end_angle, const lv_draw_arc_dsc_t * draw_dsc)
{
#if LV_DRAW_COMPLEX
LV_ASSERT_OBJ(canvas, MY_CLASS);
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
if(dsc->header.cf >= LV_IMG_CF_INDEXED_1BIT && dsc->header.cf <= LV_IMG_CF_INDEXED_8BIT) {
LV_LOG_WARN("lv_canvas_draw_arc: can't draw to LV_IMG_CF_INDEXED canvas");
return;
}
/*Create a dummy display to fool the lv_draw function.
*It will think it draws to real screen.*/
lv_disp_t fake_disp;
lv_disp_drv_t driver;
lv_area_t clip_area;
init_fake_disp(canvas, &fake_disp, &driver, &clip_area);
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
_lv_refr_set_disp_refreshing(&fake_disp);
lv_point_t p = {x, y};
lv_draw_arc(driver.draw_ctx, draw_dsc, &p, r, start_angle, end_angle);
_lv_refr_set_disp_refreshing(refr_ori);
deinit_fake_disp(canvas, &fake_disp);
lv_obj_invalidate(canvas);
#else
LV_UNUSED(canvas);
LV_UNUSED(x);
LV_UNUSED(y);
LV_UNUSED(r);
LV_UNUSED(start_angle);
LV_UNUSED(end_angle);
LV_UNUSED(draw_dsc);
LV_LOG_WARN("Can't draw arc with LV_DRAW_COMPLEX == 0");
#endif
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
LV_TRACE_OBJ_CREATE("begin");
lv_canvas_t * canvas = (lv_canvas_t *)obj;
canvas->dsc.header.always_zero = 0;
canvas->dsc.header.cf = LV_IMG_CF_TRUE_COLOR;
canvas->dsc.header.h = 0;
canvas->dsc.header.w = 0;
canvas->dsc.data_size = 0;
canvas->dsc.data = NULL;
lv_img_set_src(obj, &canvas->dsc);
LV_TRACE_OBJ_CREATE("finished");
}
static void lv_canvas_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
LV_TRACE_OBJ_CREATE("begin");
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_img_cache_invalidate_src(&canvas->dsc);
}
static void init_fake_disp(lv_obj_t * canvas, lv_disp_t * disp, lv_disp_drv_t * drv, lv_area_t * clip_area)
{
lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
clip_area->x1 = 0;
clip_area->x2 = dsc->header.w - 1;
clip_area->y1 = 0;
clip_area->y2 = dsc->header.h - 1;
/*Allocate the fake driver on the stack as the entire display doesn't outlive this function*/
lv_memset_00(disp, sizeof(lv_disp_t));
disp->driver = drv;
lv_disp_drv_init(disp->driver);
disp->driver->hor_res = dsc->header.w;
disp->driver->ver_res = dsc->header.h;
lv_draw_ctx_t * draw_ctx = lv_mem_alloc(sizeof(lv_draw_sw_ctx_t));
LV_ASSERT_MALLOC(draw_ctx);
if(draw_ctx == NULL) return;
lv_draw_sw_init_ctx(drv, draw_ctx);
disp->driver->draw_ctx = draw_ctx;
draw_ctx->clip_area = clip_area;
draw_ctx->buf_area = clip_area;
draw_ctx->buf = (void *)dsc->data;
lv_disp_drv_use_generic_set_px_cb(disp->driver, dsc->header.cf);
}
static void deinit_fake_disp(lv_obj_t * canvas, lv_disp_t * disp)
{
LV_UNUSED(canvas);
lv_draw_sw_deinit_ctx(disp->driver, disp->driver->draw_ctx);
lv_mem_free(disp->driver->draw_ctx);
}
#endif