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LibGfx: Let PNGWriter optionally embed an ICC profile

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This commit is contained in:
Nico Weber 2023-03-15 11:08:43 +01:00 • committed by Linus Groh
parent 6e2d3fe0df
commit 189ea375a5
2 changed files with 30 additions and 2 deletions
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19
Userland/Libraries/LibGfx/PNGWriter.cpp
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@ -146,6 +146,21 @@ ErrorOr<void> PNGWriter::add_IHDR_chunk(u32 width, u32 height, u8 bit_depth, PNG
return {};
}
ErrorOr<void> PNGWriter::add_iCCP_chunk(ReadonlyBytes icc_data)
{
// https://www.w3.org/TR/png/#11iCCP
PNGChunk chunk { "iCCP" };
TRY(chunk.add("embedded profile"sv.bytes()));
TRY(chunk.add_u8(0)); // \0-terminate profile name
TRY(chunk.add_u8(0)); // compression method deflate
TRY(chunk.compress_and_add(icc_data));
TRY(add_chunk(chunk));
return {};
}
ErrorOr<void> PNGWriter::add_IEND_chunk()
{
PNGChunk png_chunk { "IEND" };
@ -273,11 +288,13 @@ ErrorOr<void> PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
return {};
}
ErrorOr<ByteBuffer> PNGWriter::encode(Gfx::Bitmap const& bitmap)
ErrorOr<ByteBuffer> PNGWriter::encode(Gfx::Bitmap const& bitmap, Options options)
{
PNGWriter writer;
TRY(writer.add_png_header());
TRY(writer.add_IHDR_chunk(bitmap.width(), bitmap.height(), 8, PNG::ColorType::TruecolorWithAlpha, 0, 0, 0));
if (options.icc_data.has_value())
TRY(writer.add_iCCP_chunk(options.icc_data.value()));
TRY(writer.add_IDAT_chunk(bitmap));
TRY(writer.add_IEND_chunk());
return ByteBuffer::copy(writer.m_data);