Vendor rlottie sources with CMake and MinGW build adjustments

tools/chatgui/rlottie_src/test/test_vbitmap.cpp

@@ -0,0 +1,28 @@
+#include <gtest/gtest.h>
+#include "vbitmap.h"
+
+/*
+ * A normal, reasonably sized request must yield a usable bitmap
+ */
+TEST(VBitmapTest, allocatesNormalSize) {
+    VBitmap bitmap(100, 100, VBitmap::Format::ARGB32_Premultiplied);
+
+    ASSERT_TRUE(bitmap.valid());
+    ASSERT_NE(bitmap.data(), nullptr);
+    ASSERT_EQ(bitmap.width(), size_t(100));
+    ASSERT_EQ(bitmap.height(), size_t(100));
+    ASSERT_GE(bitmap.stride(), size_t(100) * 4);
+}
+
+/*
+ * Regression test for the heap-buffer-overflow reachable through
+ * Animation::loadFromData() with an embedded oversized image asset.
+ */
+TEST(VBitmapTest, rejectsOversizedSize) {
+    VBitmap bitmap(8194, 4096, VBitmap::Format::ARGB32_Premultiplied);
+
+    ASSERT_EQ(bitmap.data(), nullptr);
+    ASSERT_EQ(bitmap.width(), size_t(0));
+    ASSERT_EQ(bitmap.height(), size_t(0));
+    ASSERT_EQ(bitmap.stride(), size_t(0));
+}