Core (Tests): Add unit test for image loading.

Author: kaixiong

libvisual/tests/images/additive-colors-argb32.png

@@ -2,6 +2,10 @@ LV_BUILD_TEST(video_check_test
   SOURCES video_check_test.cpp
 )
 
+LV_BUILD_TEST(video_load_test
+  SOURCES video_load_test.cpp
+)
+
 IF(HAVE_SDL)
   LV_BUILD_TEST(video_scale_test
     SOURCES   video_scale_test.cpp

libvisual/tests/images/additive-colors-argb32.raw

@@ -0,0 +1,69 @@
+#include "test.h"
+#include <libvisual/libvisual.h>
+#include <fstream>
+
+namespace
+{
+  LV::VideoPtr load_raw_image (std::string const& path, int width, int height, VisVideoDepth depth)
+  {
+      auto image {LV::Video::create (width, height, depth)};
+
+      std::size_t const content_bytes_per_row = image->get_width () * image->get_bpp ();
+
+      {
+          std::ifstream input {path, std::ios::binary};
+
+          for (int y = 0; y < image->get_height (); y++) {
+              auto pixel_row_ptr = static_cast<char*> (image->get_pixel_ptr (0, y));
+              input.read (pixel_row_ptr, content_bytes_per_row);
+          }
+      }
+
+#if VISUAL_LITTLE_ENDIAN == 1
+      auto byteswapped_image {LV::Video::create (width, height, depth)};
+      byteswapped_image->flip_pixel_bytes (image);
+
+      return byteswapped_image;
+#else
+      return image;
+#endif
+  }
+
+  void test_png_load ()
+  {
+      {
+          auto png_image {LV::Video::create_from_file ("../images/additive-colors-rgb24.png")};
+          LV_TEST_ASSERT (png_image);
+
+          auto raw_image {load_raw_image ("../images/additive-colors-rgb24.raw",
+                                          png_image->get_width (),
+                                          png_image->get_height (),
+                                          VISUAL_VIDEO_DEPTH_24BIT)};
+
+          LV_TEST_ASSERT (png_image->has_same_content (raw_image));
+      }
+
+      {
+          auto png_image {LV::Video::create_from_file ("../images/additive-colors-argb32.png")};
+          LV_TEST_ASSERT (png_image);
+
+          auto raw_image {load_raw_image ("../images/additive-colors-argb32.raw",
+                                          png_image->get_width (),
+                                          png_image->get_height (),
+                                          VISUAL_VIDEO_DEPTH_32BIT)};
+
+          LV_TEST_ASSERT (png_image->has_same_content (raw_image));
+      }
+  }
+}
+
+int main (int argc, char* argv[])
+{
+    LV::System::init (argc, argv);
+
+    auto video = LV::Video::create (640, 480, VISUAL_VIDEO_DEPTH_16BIT);
+
+    test_png_load ();
+
+    LV::System::destroy ();
+}