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LibGfx/TIFF: Put metadata fields in their own struct

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This commit is contained in:
Lucas CHOLLET 2023-11-12 18:08:44 -05:00 • committed by Sam Atkins
parent 864e83079c
commit b78f93d0b5
1 changed files with 33 additions and 29 deletions
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62
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -56,7 +56,7 @@ public:
IntSize size() const
{
return m_size;
return m_metadata.size;
}
State state() const
@ -108,24 +108,34 @@ private:
HorizontalDifferencing = 2,
};
struct Metadata {
IntSize size {};
Array<u16, 3> bits_per_sample {};
Compression compression {};
Predictor predictor {};
Vector<u32> strip_offsets {};
u32 rows_per_strip {};
Vector<u32> strip_bytes_count {};
};
template<typename ByteReader>
ErrorOr<void> loop_over_pixels(ByteReader&& byte_reader, Function<ErrorOr<void>(u32)> initializer = {})
{
for (u32 strip_index = 0; strip_index < m_strip_offsets.size(); ++strip_index) {
TRY(m_stream->seek(m_strip_offsets[strip_index]));
for (u32 strip_index = 0; strip_index < m_metadata.strip_offsets.size(); ++strip_index) {
TRY(m_stream->seek(m_metadata.strip_offsets[strip_index]));
if (initializer)
TRY(initializer(m_strip_bytes_count[strip_index]));
for (u32 row = 0; row < m_rows_per_strip; row++) {
auto const scanline = row + m_rows_per_strip * strip_index;
if (scanline >= static_cast<u32>(m_size.height()))
TRY(initializer(m_metadata.strip_bytes_count[strip_index]));
for (u32 row = 0; row < m_metadata.rows_per_strip; row++) {
auto const scanline = row + m_metadata.rows_per_strip * strip_index;
if (scanline >= static_cast<u32>(m_metadata.size.height()))
break;
Optional<Color> last_color {};
for (u32 column = 0; column < static_cast<u32>(m_size.width()); ++column) {
for (u32 column = 0; column < static_cast<u32>(m_metadata.size.width()); ++column) {
auto color = Color { TRY(byte_reader()), TRY(byte_reader()), TRY(byte_reader()) };
if (m_predictor == Predictor::HorizontalDifferencing && last_color.has_value()) {
if (m_metadata.predictor == Predictor::HorizontalDifferencing && last_color.has_value()) {
color.set_red(last_color->red() + color.red());
color.set_green(last_color->green() + color.green());
color.set_blue(last_color->blue() + color.blue());
@ -142,9 +152,9 @@ private:
ErrorOr<void> decode_frame_impl()
{
m_bitmap = TRY(Bitmap::create(BitmapFormat::BGRA8888, m_size));
m_bitmap = TRY(Bitmap::create(BitmapFormat::BGRA8888, m_metadata.size));
switch (m_compression) {
switch (m_metadata.compression) {
case Compression::NoCompression:
TRY(loop_over_pixels([this]() { return read_value<u8>(); }));
break;
@ -469,7 +479,7 @@ private:
value[0].visit(
[this]<OneOf<u16, u32> T>(T const& width) {
m_size.set_width(width);
m_metadata.size.set_width(width);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
@ -483,7 +493,7 @@ private:
value[0].visit(
[this]<OneOf<u16, u32> T>(T const& width) {
m_size.set_height(width);
m_metadata.size.set_height(width);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
@ -495,10 +505,10 @@ private:
if (type != Type::UnsignedShort || count != 3)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 258");
for (u8 i = 0; i < m_bits_per_sample.size(); ++i) {
for (u8 i = 0; i < m_metadata.bits_per_sample.size(); ++i) {
value[i].visit(
[this, i](u16 const& bits_per_sample) {
m_bits_per_sample[i] = bits_per_sample;
m_metadata.bits_per_sample[i] = bits_per_sample;
},
[&](auto const&) {
VERIFY_NOT_REACHED();
@ -516,7 +526,7 @@ private:
if (compression > 6 && compression != to_underlying(Compression::PackBits))
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid compression value");
m_compression = static_cast<Compression>(compression);
m_metadata.compression = static_cast<Compression>(compression);
return {};
},
[&](auto const&) -> ErrorOr<void> {
@ -529,11 +539,11 @@ private:
if (type != Type::UnsignedShort && type != Type::UnsignedLong)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 273");
TRY(m_strip_offsets.try_ensure_capacity(count));
TRY(m_metadata.strip_offsets.try_ensure_capacity(count));
for (u32 i = 0; i < count; ++i) {
value[i].visit(
[this]<OneOf<u16, u32> T>(T const& offset) {
m_strip_offsets.append(offset);
m_metadata.strip_offsets.append(offset);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
@ -563,7 +573,7 @@ private:
value[0].visit(
[this]<OneOf<u16, u32> T>(T const& rows_per_strip) {
m_rows_per_strip = rows_per_strip;
m_metadata.rows_per_strip = rows_per_strip;
},
[&](auto const&) {
VERIFY_NOT_REACHED();
@ -575,11 +585,11 @@ private:
if (type != Type::UnsignedShort && type != Type::UnsignedLong)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 279");
TRY(m_strip_bytes_count.try_ensure_capacity(count));
TRY(m_metadata.strip_bytes_count.try_ensure_capacity(count));
for (u32 i = 0; i < count; ++i) {
value[i].visit(
[this]<OneOf<u16, u32> T>(T const& offset) {
m_strip_bytes_count.append(offset);
m_metadata.strip_bytes_count.append(offset);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
@ -596,7 +606,7 @@ private:
if (predictor != 1 && predictor != 2)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid predictor value");
m_predictor = static_cast<Predictor>(predictor);
m_metadata.predictor = static_cast<Predictor>(predictor);
return {};
},
[&](auto const&) -> ErrorOr<void> {
@ -611,19 +621,13 @@ private:
}
NonnullOwnPtr<FixedMemoryStream> m_stream;
IntSize m_size {};
State m_state {};
RefPtr<Bitmap> m_bitmap {};
ByteOrder m_byte_order {};
Optional<u32> m_next_ifd {};
Array<u16, 3> m_bits_per_sample {};
Compression m_compression {};
Predictor m_predictor {};
Vector<u32> m_strip_offsets {};
u32 m_rows_per_strip {};
Vector<u32> m_strip_bytes_count {};
Metadata m_metadata {};
};
TIFFImageDecoderPlugin::TIFFImageDecoderPlugin(NonnullOwnPtr<FixedMemoryStream> stream)