Don't stretch bitmaps if destination size is empty.

BUG=405201
R=bo_xu@foxitsoftware.com

Review URL: https://codereview.chromium.org/474093003

core/src/fxge/win32/fx_win32_device.cpp

diff --git a/core/src/fxge/win32/fx_win32_device.cpp b/core/src/fxge/win32/fx_win32_device.cpp
index 5e76898..eee4fd8 100644
--- a/core/src/fxge/win32/fx_win32_device.cpp
+++ b/core/src/fxge/win32/fx_win32_device.cpp
@@ -515,7 +515,7 @@
         int dest_width, int dest_height, FX_DWORD flags, void* pIccTransform)
 {
     CFX_DIBitmap* pBitmap = (CFX_DIBitmap*)pBitmap1;
-    if (pBitmap == NULL) {
+    if (pBitmap == NULL || dest_width == 0  || dest_height == 0) {
         return FALSE;
     }
     if ((pBitmap->IsCmykImage() || pIccTransform) &&
@@ -549,7 +549,7 @@
         int alpha_flag, void* pIccTransform)
 {
     CFX_DIBitmap* pBitmap = (CFX_DIBitmap*)pBitmap1;
-    if (pBitmap == NULL) {
+    if (pBitmap == NULL || dest_width == 0  || dest_height == 0) {
         return FALSE;
     }
     _Color2Argb(bitmap_color, bitmap_color, alpha_flag | (1 << 24), pIccTransform);