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Support for grayscale formats in PNG reader for PixelBuffer, writing non-alpha RGB versions from non-transparent PixelBuffers

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This commit is contained in:
Matthias Koefferlein
2022-05-09 22:13:35 +02:00
parent 7bb3e0daf3
commit 128afc43cf
5 changed files with 158 additions and 8 deletions
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src/laybasic/unit_tests/layPixelBufferTests.cc
+85 -1
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@@ -319,9 +319,93 @@ TEST(4)
#endif
}
TEST(5)
{
lay::PixelBuffer img;
std::string in = tl::testsrc () + "/testdata/lay/png3.png"; // GA
tl::info << "PNG file read (libpng) from " << in;
{
tl::InputStream stream (in);
img = lay::PixelBuffer::read_png (stream);
}
std::string tmp = tmp_file ("test.png");
{
tl::OutputStream stream (tmp);
img.write_png (stream);
}
tl::info << "PNG file written to " << tmp;
lay::PixelBuffer img2;
{
tl::InputStream stream (tmp);
img2 = lay::PixelBuffer::read_png (stream);
}
std::string tmp2 = tmp_file ("test2.png");
{
tl::OutputStream stream (tmp2);
img2.write_png (stream);
}
tl::info << "PNG file written to " << tmp2;
EXPECT_EQ (compare_images (img, img2), true);
#if defined (HAVE_QT)
// Qt cross-check
std::string au = tl::testsrc () + "/testdata/lay/au_gs.png";
EXPECT_EQ (compare_images (img2.to_image (), au), true);
#endif
}
TEST(6)
{
lay::PixelBuffer img;
std::string in = tl::testsrc () + "/testdata/lay/png4.png"; // G
tl::info << "PNG file read (libpng) from " << in;
{
tl::InputStream stream (in);
img = lay::PixelBuffer::read_png (stream);
}
std::string tmp = tmp_file ("test.png");
{
tl::OutputStream stream (tmp);
img.write_png (stream);
}
tl::info << "PNG file written to " << tmp;
lay::PixelBuffer img2;
{
tl::InputStream stream (tmp);
img2 = lay::PixelBuffer::read_png (stream);
}
std::string tmp2 = tmp_file ("test2.png");
{
tl::OutputStream stream (tmp2);
img2.write_png (stream);
}
tl::info << "PNG file written to " << tmp2;
EXPECT_EQ (compare_images (img, img2), true);
#if defined (HAVE_QT)
// Qt cross-check
std::string au = tl::testsrc () + "/testdata/lay/au_gs.png";
EXPECT_EQ (compare_images (img2.to_image (), au), true);
#endif
}
#endif
TEST(5)
TEST(7)
{
{
tl::SelfTimer timer ("Run time - lay::Image copy, no write (should be very fast)");