diff --git a/src/c_api.cpp b/src/c_api.cpp
index 2a7ee3421e3..7b40042d692 100644
--- a/src/c_api.cpp
+++ b/src/c_api.cpp
@@ -1458,6 +1458,86 @@ void ncnn_copy_cut_border_3d(const ncnn_mat_t src, ncnn_mat_t dst, int top, int
     copy_cut_border_3d(*(const Mat*)src, *(Mat*)dst, top, bottom, left, right, front, behind, _opt);
 }
 
+void ncnn_draw_rectangle_c1(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness)
+{
+    ncnn::draw_rectangle_c1(pixels, w, h, w, rx, ry, rw, rh, color, thickness);
+}
+
+void ncnn_draw_rectangle_c2(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness)
+{
+    ncnn::draw_rectangle_c2(pixels, w, h, w * 2, rx, ry, rw, rh, color, thickness);
+}
+
+void ncnn_draw_rectangle_c3(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness)
+{
+    ncnn::draw_rectangle_c3(pixels, w, h, w * 3, rx, ry, rw, rh, color, thickness);
+}
+
+void ncnn_draw_rectangle_c4(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness)
+{
+    ncnn::draw_rectangle_c4(pixels, w, h, w * 4, rx, ry, rw, rh, color, thickness);
+}
+
+void ncnn_draw_text_c1(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
+{
+    ncnn::draw_text_c1(pixels, w, h, w, text, x, y, fontpixelsize, color);
+}
+
+void ncnn_draw_text_c2(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
+{
+    ncnn::draw_text_c2(pixels, w, h, w * 2, text, x, y, fontpixelsize, color);
+}
+
+void ncnn_draw_text_c3(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
+{
+    ncnn::draw_text_c3(pixels, w, h, w * 3, text, x, y, fontpixelsize, color);
+}
+
+void ncnn_draw_text_c4(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color)
+{
+    ncnn::draw_text_c4(pixels, w, h, w * 4, text, x, y, fontpixelsize, color);
+}
+
+void ncnn_draw_circle_c1(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness)
+{
+    ncnn::draw_circle_c1(pixels, w, h, w, cx, cy, radius, color, thickness);
+}
+
+void ncnn_draw_circle_c2(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness)
+{
+    ncnn::draw_circle_c2(pixels, w, h, w * 2, cx, cy, radius, color, thickness);
+}
+
+void ncnn_draw_circle_c3(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness)
+{
+    ncnn::draw_circle_c3(pixels, w, h, w * 3, cx, cy, radius, color, thickness);
+}
+
+void ncnn_draw_circle_c4(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness)
+{
+    ncnn::draw_circle_c4(pixels, w, h, w * 4, cx, cy, radius, color, thickness);
+}
+
+void ncnn_draw_line_c1(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness)
+{
+    ncnn::draw_line_c1(pixels, w, h, w, x0, y0, x1, y1, color, thickness);
+}
+
+void ncnn_draw_line_c2(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness)
+{
+    ncnn::draw_line_c2(pixels, w, h, w * 2, x0, y0, x1, y1, color, thickness);
+}
+
+void ncnn_draw_line_c3(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness)
+{
+    ncnn::draw_line_c3(pixels, w, h, w * 3, x0, y0, x1, y1, color, thickness);
+}
+
+void ncnn_draw_line_c4(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness)
+{
+    ncnn::draw_line_c4(pixels, w, h, w * 4, x0, y0, x1, y1, color, thickness);
+}
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif
diff --git a/src/c_api.h b/src/c_api.h
index 31d5b6d7089..28949083265 100644
--- a/src/c_api.h
+++ b/src/c_api.h
@@ -338,6 +338,27 @@ NCNN_EXPORT void ncnn_copy_make_border_3d(const ncnn_mat_t src, ncnn_mat_t dst,
 NCNN_EXPORT void ncnn_copy_cut_border(const ncnn_mat_t src, ncnn_mat_t dst, int top, int bottom, int left, int right, const ncnn_option_t opt);
 NCNN_EXPORT void ncnn_copy_cut_border_3d(const ncnn_mat_t src, ncnn_mat_t dst, int top, int bottom, int left, int right, int front, int behind, const ncnn_option_t opt);
 
+/* mat pixel drawing api*/
+NCNN_EXPORT void ncnn_draw_rectangle_c1(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_rectangle_c2(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_rectangle_c3(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_rectangle_c4(unsigned char* pixels, int w, int h, int rx, int ry, int rw, int rh, unsigned int color, int thickness);
+
+NCNN_EXPORT void ncnn_draw_text_c1(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color);
+NCNN_EXPORT void ncnn_draw_text_c2(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color);
+NCNN_EXPORT void ncnn_draw_text_c3(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color);
+NCNN_EXPORT void ncnn_draw_text_c4(unsigned char* pixels, int w, int h, const char* text, int x, int y, int fontpixelsize, unsigned int color);
+
+NCNN_EXPORT void ncnn_draw_circle_c1(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_circle_c2(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_circle_c3(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_circle_c4(unsigned char* pixels, int w, int h, int cx, int cy, int radius, unsigned int color, int thickness);
+
+NCNN_EXPORT void ncnn_draw_line_c1(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_line_c2(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_line_c3(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness);
+NCNN_EXPORT void ncnn_draw_line_c4(unsigned char* pixels, int w, int h, int x0, int y0, int x1, int y1, unsigned int color, int thickness);
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif