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lv_canvas: lv_canvas_copy_to_buf

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This commit is contained in:
Gabor Kiss-Vamosi 2019-01-16 08:37:18 +01:00
parent 8ddc9f21fe
commit 6d449962ff
2 changed files with 44 additions and 5 deletions
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38
lv_objx/lv_canvas.c
View File

@ -95,8 +95,8 @@ lv_obj_t * lv_canvas_create(lv_obj_t * par, const lv_obj_t * copy)
/**
* Set the color of a pixel on the canvas
* @param canvas
* @param x x coordiante of the point to set
* @param y x coordiante of the point to set
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param c color of the point
*/
void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t c)
@ -114,6 +114,34 @@ void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t
memcpy((void*)&ext->dsc.data[px], &c, sizeof(lv_color_t));
}
/**
* Copy a buffer to the canvas
* @param canvas pointer to a canvas object
* @param to_copy buffer to copy. The color format has to match with the canvas's buffer color format
* @param w width of the buffer to copy
* @param h height of the buffer to copy
* @param x left side of the destination position
* @param y top side of the destination position
*/
void lv_canvas_copy_to_buf(lv_obj_t * canvas, void * to_copy, lv_coord_t w, lv_coord_t h, lv_coord_t x, lv_coord_t y)
{
lv_canvas_ext_t * ext = lv_obj_get_ext_attr(canvas);
if(x + w >= ext->dsc.header.w || y + h >= ext->dsc.header.h) {
LV_LOG_WARN("lv_canvas_copy_to_buf: x or y out of the canvas");
return;
}
uint32_t px_size = lv_img_color_format_get_px_size(ext->dsc.header.cf) >> 3;
uint32_t px = ext->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++) {
memcpy(&ext->dsc.data[px], to_copy8, w * px_size);
px += ext->dsc.header.w * px_size;
to_copy8 += w * px_size;
}
}
/*=====================
* Setter functions
@ -121,14 +149,14 @@ void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t
/**
* Set a buffer for the canvas.
* @param buf a buffer where the contant of the canvas will be.
* @param buf a buffer where the content of the canvas will be.
* The required size is (lv_img_color_format_get_px_size(cf) * w * h) / 8)
* It can be allocated with `lv_mem_alloc()` or
* it can be statically allocated array (e.g. static lv_color_t buf[100*50]) or
* it can be an address in RAM or external SRAM
* @param canvas pointer to a canvas obejct
* @param canvas pointer to a canvas object
* @param w width of the canvas
* @param h hight of the canvas
* @param h height of the canvas
* @param cf color format. The following formats are supported:
* LV_IMG_CF_TRUE_COLOR, LV_IMG_CF_TRUE_COLOR_ALPHA, LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED
*

11
lv_objx/lv_canvas.h
View File

@ -71,6 +71,17 @@ lv_obj_t * lv_canvas_create(lv_obj_t * par, const lv_obj_t * copy);
*/
void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t c);
/**
* Copy a buffer to the canvas
* @param canvas pointer to a canvas object
* @param to_copy buffer to copy. The color format has to match with the canvas's buffer color format
* @param w width of the buffer to copy
* @param h height of the buffer to copy
* @param x left side of the destination position
* @param y top side of the destination position
*/
void lv_canvas_copy_to_buf(lv_obj_t * canvas, void * to_copy, lv_coord_t w, lv_coord_t h, lv_coord_t x, lv_coord_t y);
/*=====================
* Setter functions
*====================*/