112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
package dcc
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import (
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"io"
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"github.com/FooSoft/lazarus/streaming"
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)
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type directionHeader struct {
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CodedSize uint32
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HasRawPixelEncoding bool
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CompressEqualCells bool
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Variable0Bits uint8
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WidthBits uint8
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HeightBits uint8
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OffsetXBits uint8
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OffsetYBits uint8
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OptionalBytesBits uint8
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CodedBytesBits uint8
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}
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type direction struct {
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header directionHeader
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frames []frame
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bounds bounds
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}
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func readDirectionHeader(bitReader *streaming.BitReader) directionHeader {
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var dirHead directionHeader
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dirHead.CodedSize = uint32(bitReader.ReadUint(32))
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dirHead.HasRawPixelEncoding = bitReader.ReadBool()
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dirHead.CompressEqualCells = bitReader.ReadBool()
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dirHead.Variable0Bits = uint8(bitReader.ReadUint(4))
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dirHead.WidthBits = uint8(bitReader.ReadUint(4))
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dirHead.HeightBits = uint8(bitReader.ReadUint(4))
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dirHead.OffsetXBits = uint8(bitReader.ReadInt(4))
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dirHead.OffsetYBits = uint8(bitReader.ReadInt(4))
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dirHead.OptionalBytesBits = uint8(bitReader.ReadUint(4))
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dirHead.CodedBytesBits = uint8(bitReader.ReadUint(4))
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return dirHead
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}
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func readDirection(reader io.ReadSeeker, fileHead fileHeader) (*direction, error) {
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bitReader := streaming.NewBitReader(reader)
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dirHead := readDirectionHeader(bitReader)
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if err := bitReader.Error(); err != nil {
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return nil, err
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}
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frameHeads, err := readFrameHeaders(bitReader, fileHead, dirHead)
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if err != nil {
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return nil, err
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}
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var dirData direction
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for i, frameHead := range frameHeads {
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frameData := frame{
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header: frameHead,
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bounds: bounds{
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x1: int(frameHead.OffsetX),
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y1: int(frameHead.OffsetY) - int(frameHead.Height) + 1,
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x2: int(frameHead.OffsetX) + int(frameHead.Width),
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y2: int(frameHead.OffsetY) + 1,
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},
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}
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dirData.frames = append(dirData.frames, frameData)
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if i == 0 {
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dirData.bounds = frameData.bounds
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} else {
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if dirData.bounds.x1 > frameData.bounds.x1 {
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dirData.bounds.x1 = frameData.bounds.x1
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}
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if dirData.bounds.y1 > frameData.bounds.y1 {
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dirData.bounds.y1 = frameData.bounds.y1
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}
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if dirData.bounds.x2 < frameData.bounds.x2 {
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dirData.bounds.x2 = frameData.bounds.x2
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}
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if dirData.bounds.y2 < frameData.bounds.y2 {
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dirData.bounds.y2 = frameData.bounds.y2
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}
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}
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}
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var entries []pixelBufferEntry
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entries, err = decodeDirectionStage1(bitReader, &dirData, entries)
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if err != nil {
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return nil, err
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}
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entries, err = decodeDirectionStage2(bitReader, &dirData, entries)
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if err != nil {
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return nil, err
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}
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return &dirData, nil
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}
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func decodeDirectionStage1(bitReader *streaming.BitReader, dirData *direction, entries []pixelBufferEntry) ([]pixelBufferEntry, error) {
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return nil, nil
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}
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func decodeDirectionStage2(bitReader *streaming.BitReader, dirData *direction, entries []pixelBufferEntry) ([]pixelBufferEntry, error) {
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return nil, nil
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}
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