ImageSharp

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Commit Graph

Author	SHA1	Message	Date
Brian Popow	1996831667	Decoding Bitmaps with BITFIELDS masks (#796 ) * decoding bitmaps with Bitfields masks * added testcases for Bitfields bitmaps * added parsing of the complete bitmap V4 header to get the color masks infos for the BITFIELDS compression * writing now explicitly a Bitamp v3 header (40 bytes) * added test image for issue #735 * fixed rescaling 5-bit / 6-bit to 0 - 255 range * BitmapEncoder now writes BMP v4 header * using MemoryMarshal.Cast to simplify parsing v4 header * added testcases for bitmap v3, v4, v5 * Bitmap encoder writes again V3 header instead of V4. Additional fields for V4 are zero anyway. * added parsing of special case for 56 bytes headers * using the alpha mask in ReadRgb32BitFields() when its present * added support for bitmasks greater then 8 bits per channel * using MagickReferenceDecoder reference decoder for the test with 10 bits pixel masks * changed bitmap constants to hex * added enum for the bitmap info header type * added support for 52 bytes header (same as 56 bytes without the alpha mask) * clarified comment with difference between imagesharp and magick decoder for Rgba321010102 * BmpEncoder now writes a V4 info header and uses BITFIELDS compression * workaround for issue that the decoder does not decode the alpha channel correctly: For V3 bitmaps, the alpha channel will be ignored during encoding * Fix #732	8 years ago

Author

SHA1

Message

Date

Brian Popow

1996831667

Decoding Bitmaps with BITFIELDS masks (#796 )

* decoding bitmaps with Bitfields masks

* added testcases for Bitfields bitmaps

* added parsing of the complete bitmap V4 header to get the color masks infos for the BITFIELDS compression

* writing now explicitly a Bitamp v3 header (40 bytes)

* added test image for issue #735

* fixed rescaling 5-bit / 6-bit to 0 - 255 range

* BitmapEncoder now writes BMP v4 header

* using MemoryMarshal.Cast to simplify parsing v4 header

* added testcases for bitmap v3, v4, v5

* Bitmap encoder writes again V3 header instead of V4. Additional fields for V4 are zero anyway.

* added parsing of special case for 56 bytes headers

* using the alpha mask in ReadRgb32BitFields() when its present

* added support for bitmasks greater then 8 bits per channel

* using MagickReferenceDecoder reference decoder for the test with 10 bits pixel masks

* changed bitmap constants to hex

* added enum for the bitmap info header type

* added support for 52 bytes header (same as 56 bytes without the alpha mask)

* clarified comment with difference between imagesharp and magick decoder for Rgba321010102

* BmpEncoder now writes a V4 info header and uses BITFIELDS compression

* workaround for issue that the decoder does not decode the alpha channel correctly: For V3 bitmaps, the alpha channel will be ignored during encoding

* Fix #732

8 years ago

1 Commits (4dd536d981e5a1c0362884837eb9f5959fc918fb)