From 858c21d9991ac7267d62922ad7bf3f9fe01bbd0e Mon Sep 17 00:00:00 2001
From: Gabor Kiss-Vamosi <kisvegabor@gmail.com>
Date: Tue, 31 Mar 2020 12:14:28 +0200
Subject: [PATCH] optmize lv_canvas_fill_bg

---
 src/lv_widgets/lv_canvas.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/src/lv_widgets/lv_canvas.c b/src/lv_widgets/lv_canvas.c
index 836cfded0..4da3152a8 100644
--- a/src/lv_widgets/lv_canvas.c
+++ b/src/lv_widgets/lv_canvas.c
@@ -147,7 +147,6 @@ void lv_canvas_set_buffer(lv_obj_t * canvas, void * buf, lv_coord_t w, lv_coord_
     ext->dsc.header.w  = w;
     ext->dsc.header.h  = h;
     ext->dsc.data      = buf;
-    ext->dsc.data_size = (lv_img_cf_get_px_size(cf) * w * h) / 8;
 
     lv_img_set_src(canvas, &ext->dsc);
 }
@@ -652,13 +651,25 @@ void lv_canvas_fill_bg(lv_obj_t * canvas, lv_color_t color, lv_opa_t opa)
 
     lv_img_dsc_t * dsc = lv_canvas_get_img(canvas);
 
-    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);
-        }
+    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);