优化 resize 函数，更新相关文档

wysaid · Jul 16, 2020 · 16cfad1 · 16cfad1
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diff --git a/man/api/img/resize.htm b/man/api/img/resize.htm
@@ -7,7 +7,7 @@
 <pre><font size="4"><a href="../../index.htm">主页</a>-＞<a href="../index.htm">库函数目录</a>-＞<a href="index.htm">图像处理相关函数</a>-＞resize</font>
 <font size="4">
 <font size="5" color="#0000FF"><strong>功能：</strong></font>
-这个函数用于调整图像的尺寸，调整后，图像用背景色填充。
+这个函数用于调整图像的尺寸，调整后，图像内容未定义，视口还原为初始状态。
 
 <font size="5" color="#0000FF"><strong>声明：</strong></font>
 <pre><font color=#0000FF>int </font><font color=#008080>resize</font>(

diff --git a/src/image.cpp b/src/image.cpp
@@ -225,6 +225,11 @@ IMAGE::resize(int width, int height) {
 	if (width < 0) width = 0;
 	if (height < 0) height = 0;
 
+	if (width == m_width && height == m_height) {
+		setviewport(0, 0, m_width, m_height, 1, this);
+		return 0;
+	}
+
 	PDWORD bmp_buf;
 	HBITMAP bitmap     = newbitmap(width, height, &bmp_buf);
 	HBITMAP old_bitmap = (HBITMAP)SelectObject(this->m_hDC, bitmap);