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LibGfx/BMPWriter: Add support for V3 & V4 DIB headers
This adds very simple support for storing BMP files with BITMAPV3INFOHEADER and BITMAPV4HEADER. This in turn allows us to store alpha channels which is nice for our .pp file format. For the moment no data regarding colorspace is saved, only the bare minimum to make a valid file. Some small restructuring of the code is made to hopefully make it easier to implement more DIB-headers and support for colorspace/gamma correction in the future.
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commit
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2 changed files with 68 additions and 30 deletions
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@ -16,16 +16,25 @@ class BMPWriter {
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public:
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BMPWriter() = default;
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ByteBuffer dump(const RefPtr<Bitmap>);
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enum class Compression : u32 {
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RGB = 0,
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BI_RGB = 0,
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BI_BITFIELDS = 3,
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};
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enum class DibHeader : u32 {
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Info = 40,
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V3 = 56,
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V4 = 108,
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};
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ByteBuffer dump(const RefPtr<Bitmap>, DibHeader dib_header = DibHeader::V4);
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inline void set_compression(Compression compression) { m_compression = compression; }
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private:
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Compression m_compression { Compression::RGB };
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Compression m_compression { Compression::BI_BITFIELDS };
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int m_bytes_per_pixel { 4 };
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bool m_include_alpha_channel { true };
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};
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}
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