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LibGfx: Prevent frequent memory allocations in PNGWriter

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Aziz Berkay Yesilyurt 2021-07-11 18:50:45 +02:00 • committed by Andreas Kling
parent 97859aaff1
commit d84c4b94da
1 changed files with 2 additions and 0 deletions
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2
Userland/Libraries/LibGfx/PNGWriter.cpp
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@ -18,6 +18,7 @@ public:
explicit PNGChunk(String); explicit PNGChunk(String);
auto const& data() const { return m_data; }; auto const& data() const { return m_data; };
String const& type() const { return m_type; }; String const& type() const { return m_type; };
void reserve(size_t bytes) { m_data.ensure_capacity(bytes); }
template<typename T> template<typename T>
void add_as_big_endian(T); void add_as_big_endian(T);
@ -166,6 +167,7 @@ void PNGWriter::add_IEND_chunk()
void PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap) void PNGWriter::add_IDAT_chunk(Gfx::Bitmap const& bitmap)
{ {
PNGChunk png_chunk { "IDAT" }; PNGChunk png_chunk { "IDAT" };
png_chunk.reserve(bitmap.size_in_bytes());
u16 CMF_FLG = 0x81d; u16 CMF_FLG = 0x81d;
png_chunk.add_as_big_endian(CMF_FLG); png_chunk.add_as_big_endian(CMF_FLG);