update docs

3rd/nanovg/agge/nanovg_agge.cpp

@@ -291,7 +291,7 @@ static agge::pixel32_rgba to_pixel32_rgba(NVGcolor rgba) {
 static int clip_rect_is_zero(NVGscissor* scissor) {
   int w = (int)(scissor->extent[0] + 0.5f);
   int h = (int)(scissor->extent[1] + 0.5f);
-  if (w == 0 || h == 0) {
+  if (w <= 0 || h <= 0) {
     return 0;
   }
   return 1;

docs/changes.md

@@ -3,6 +3,7 @@
 2021/01/12
   * 完善 widget\_exec\_code
   * fscript widget增加send\_key。
+  * 修复agge初始化裁剪区宽高默认为-1的问题（感谢智明提供补丁）
 
 2021/01/11
   * 更新文档。

src/lcd/lcd_mem.inc

@@ -266,6 +266,7 @@ static vgcanvas_t* lcd_mem_get_vgcanvas(lcd_t* lcd) {
 
   if (mem->vgcanvas == NULL) {
     mem->vgcanvas = vgcanvas_create(w, h, line_length, format, fbdata);
+    vgcanvas_clip_rect(mem->vgcanvas, 0, 0, w, h);
   } else {
     vgcanvas_reinit(mem->vgcanvas, w, h, line_length, format, fbdata);
   }