TEST_F(BitmapImageTest, destroyDecodedDataExceptCurrentFrame)
{
loadImage("/tests/fast/images/resources/animated-10color.gif");
size_t totalSize = decodedSize();
size_t frame = frameCount() / 2;
setCurrentFrame(frame);
size_t size = frameDecodedSize(frame);
destroyDecodedData(false);
EXPECT_LT(m_imageObserver.m_lastDecodedSizeChangedDelta, 0);
EXPECT_GE(m_imageObserver.m_lastDecodedSizeChangedDelta, -static_cast<int>(totalSize - size));
}
size_t decodedSize()
{
// In the context of this test, the following loop will give the correct result, but only because the test
// forces all frames to be decoded in loadImage() above. There is no general guarantee that frameDecodedSize()
// is up-to-date. Because of how multi frame images (like GIF) work, requesting one frame to be decoded may
// require other previous frames to be decoded as well. In those cases frameDecodedSize() wouldn't return the
// correct thing for the previous frame because the decoded size wouldn't have propagated upwards to the
// BitmapImage frame cache.
size_t size = 0;
for (size_t i = 0; i < decodedFramesCount(); ++i)
size += frameDecodedSize(i);
return size;
}
