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fix(snapshot): make snapshot work again

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Support inly true color, true color alpha and a8 formats
This commit is contained in:
Gabor Kiss-Vamosi
2022-07-24 16:18:50 +02:00
parent 7823db1ded
commit cd4d07a4ba
2 changed files with 20 additions and 19 deletions
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5
docs/others/snapshot.md
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@@ -8,13 +8,10 @@ Simply call API `lv_snapshot_take` to generate the image descriptor which can be
Note, only below color formats are supported for now:
- LV_IMG_CF_TRUE_COLOR
- LV_IMG_CF_TRUE_COLOR_ALPHA
- LV_IMG_CF_ALPHA_1BIT
- LV_IMG_CF_ALPHA_2BIT
- LV_IMG_CF_ALPHA_4BIT
- LV_IMG_CF_ALPHA_8BIT
### Free the Image
The memory `lv_snapshot_take` uses are dynamically allocated using `lv_mem_alloc`. Use API `lv_snapshot_free` to free the memory it takes. This will firstly free memory the image data takes, then the image descriptor.

34
src/others/snapshot/lv_snapshot.c
View File

@@ -49,12 +49,10 @@ uint32_t lv_snapshot_buf_size_needed(lv_obj_t * obj, lv_img_cf_t cf)
switch(cf) {
case LV_IMG_CF_TRUE_COLOR:
case LV_IMG_CF_TRUE_COLOR_ALPHA:
case LV_IMG_CF_ALPHA_1BIT:
case LV_IMG_CF_ALPHA_2BIT:
case LV_IMG_CF_ALPHA_4BIT:
case LV_IMG_CF_ALPHA_8BIT:
break;
default:
LV_LOG_WARN("Not supported color format");
return 0;
}
@@ -66,9 +64,11 @@ uint32_t lv_snapshot_buf_size_needed(lv_obj_t * obj, lv_img_cf_t cf)
lv_coord_t ext_size = _lv_obj_get_ext_draw_size(obj);
w += ext_size * 2;
h += ext_size * 2;
uint8_t px_size;
if(cf == LV_IMG_CF_TRUE_COLOR_ALPHA) px_size = LV_IMG_PX_SIZE_ALPHA_BYTE;
else px_size = sizeof(lv_color_t);
uint8_t px_size = lv_img_cf_get_px_size(cf);
return w * h * ((px_size + 7) >> 3);
return w * h * px_size;
}
/** Take snapshot for object with its children, save image info to provided buffer.
@@ -90,17 +90,14 @@ lv_res_t lv_snapshot_take_to_buf(lv_obj_t * obj, lv_img_cf_t cf, lv_img_dsc_t *
switch(cf) {
case LV_IMG_CF_TRUE_COLOR:
case LV_IMG_CF_TRUE_COLOR_ALPHA:
case LV_IMG_CF_ALPHA_1BIT:
case LV_IMG_CF_ALPHA_2BIT:
case LV_IMG_CF_ALPHA_4BIT:
case LV_IMG_CF_ALPHA_8BIT:
break;
default:
LV_LOG_WARN("Not supported color format");
return LV_RES_INV;
}
if(lv_snapshot_buf_size_needed(obj, cf) > buff_size)
return LV_RES_INV;
if(lv_snapshot_buf_size_needed(obj, cf) > buff_size) return LV_RES_INV;
/*Width and height determine snapshot image size.*/
lv_coord_t w = lv_obj_get_width(obj);
@@ -115,6 +112,11 @@ lv_res_t lv_snapshot_take_to_buf(lv_obj_t * obj, lv_img_cf_t cf, lv_img_dsc_t *
lv_memset(buf, 0x00, buff_size);
lv_memzero(dsc, sizeof(lv_img_dsc_t));
dsc->data = buf;
dsc->header.w = w;
dsc->header.h = h;
dsc->header.cf = cf;
lv_disp_t * obj_disp = lv_obj_get_disp(obj);
lv_disp_drv_t driver;
@@ -122,7 +124,7 @@ lv_res_t lv_snapshot_take_to_buf(lv_obj_t * obj, lv_img_cf_t cf, lv_img_dsc_t *
/*In lack of a better idea use the resolution of the object's display*/
driver.hor_res = lv_disp_get_hor_res(obj_disp);
driver.ver_res = lv_disp_get_hor_res(obj_disp);
lv_disp_drv_use_generic_set_px_cb(&driver, cf);
lv_disp_t fake_disp;
lv_memzero(&fake_disp, sizeof(lv_disp_t));
@@ -136,6 +138,10 @@ lv_res_t lv_snapshot_take_to_buf(lv_obj_t * obj, lv_img_cf_t cf, lv_img_dsc_t *
draw_ctx->clip_area = &snapshot_area;
draw_ctx->buf_area = &snapshot_area;
draw_ctx->buf = (void *)buf;
if(dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) draw_ctx->color_format = LV_COLOR_FORMAT_L8;
else if(dsc->header.cf != LV_IMG_CF_TRUE_COLOR_ALPHA) draw_ctx->render_with_alpha = false;
else draw_ctx->render_with_alpha = true;
driver.draw_ctx = draw_ctx;
lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
@@ -143,14 +149,12 @@ lv_res_t lv_snapshot_take_to_buf(lv_obj_t * obj, lv_img_cf_t cf, lv_img_dsc_t *
lv_obj_redraw(draw_ctx, obj);
if(draw_ctx->buffer_convert) draw_ctx->buffer_convert(draw_ctx);
_lv_refr_set_disp_refreshing(refr_ori);
obj_disp->driver->draw_ctx_deinit(fake_disp.driver, draw_ctx);
lv_free(draw_ctx);
dsc->data = buf;
dsc->header.w = w;
dsc->header.h = h;
dsc->header.cf = cf;
return LV_RES_OK;
}