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A: GIF Play component

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This commit is contained in:
杨红岩 2024-04-19 22:50:31 +08:00
parent 08fc3d01ca
commit 0264e7f7d5
3 changed files with 36 additions and 50 deletions
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11
cef/gifplay/image.go
View File

@ -17,11 +17,10 @@ import (
)
type TGIFImage struct {
Bitmap *ext.TBitmap
PosX uint16
PosY uint16
Delay uint16
Method byte
Bitmap *ext.TBitmap
PosX, PosY uint16
Delay uint16
Method byte
}
type TGIFImageDescriptor struct {
@ -40,7 +39,7 @@ func (m *TGIFImageDescriptor) BytesToConvert(data []byte) {
type TGIFGraphicsControlExtension struct {
BlockSize byte // 剩余字段的大小（始终为04h）
Packedbit byte // 要使用的图形处理方法
PackedBit byte // 要使用的图形处理方法
DelayTime uint16 // 等待数十秒
ColorIndex byte // 透明颜色索引
Terminator byte // 块终止符（始终为0）

65
cef/gifplay/loader.go
View File

@ -120,26 +120,24 @@ func (m *TGIFLoader) ReadPalette(stream *lcl.TMemoryStream, size int) {
func (m *TGIFLoader) ReadScanLine(stream *lcl.TMemoryStream) {
var (
unpackedSize, packedSize int64
data, bits, code uint32
sourcePtr PByte
inCode uint32
codeSize uint32
codeMask uint32
freeCode uint32
oldCode uint32
prefix [CODE_TABLE_SIZE]uint32
suffix, stack = make([]byte, CODE_TABLE_SIZE), make([]byte, CODE_TABLE_SIZE)
stackPointer PByte
b, initialCodeSize, firstChar byte
clearCode, eoiCode uint16
unpackedSize, packedSize int64
data, bits, code uint32
inCode uint32
codeSize uint32
codeMask uint32
freeCode uint32
oldCode uint32
prefix [CODE_TABLE_SIZE]uint32
suffix, stack = make([]byte, CODE_TABLE_SIZE), make([]byte, CODE_TABLE_SIZE)
b, initialCodeSize, firstChar byte
clearCode, eoiCode uint16
targetIdx, stackIdx, sourceDataIdx int
)
// 解压缩字典的初始化
_, d := stream.Read(1)
initialCodeSize = d[0]
// 压缩尾部
OldPos := stream.Position()
packedSize = 0
oldPos := stream.Position()
for {
_, d = stream.Read(1)
b = d[0]
@ -151,7 +149,7 @@ func (m *TGIFLoader) ReadScanLine(stream *lcl.TMemoryStream) {
break
}
}
stream.SetPosition(OldPos)
stream.SetPosition(oldPos)
var sourceBuf bytes.Buffer
for {
_, d = stream.Read(1)
@ -166,8 +164,6 @@ func (m *TGIFLoader) ReadScanLine(stream *lcl.TMemoryStream) {
}
sourceData := sourceBuf.Bytes()
sourceBuf.Reset()
sourcePtr = PByte(unsafe.Pointer(&sourceData[0]))
target := uintptr(unsafe.Pointer(&m.scanLine[0]))
codeSize = uint32(initialCodeSize + 1)
clearCode = 1 << initialCodeSize
eoiCode = clearCode + 1
@ -179,13 +175,12 @@ func (m *TGIFLoader) ReadScanLine(stream *lcl.TMemoryStream) {
prefix[I] = CODE_TABLE_SIZE
suffix[I] = byte(I)
}
stackPointer = uintptr(unsafe.Pointer(&stack[0]))
firstChar = 0
data = 0
bits = 0
//解压缩LZW gif
for unpackedSize > 0 && packedSize > 0 {
source := uint32(*(*byte)(unsafe.Pointer(sourcePtr)))
source := uint32(sourceData[sourceDataIdx])
data += source << bits
bits += 8
for bits >= codeSize {
@ -207,26 +202,26 @@ func (m *TGIFLoader) ReadScanLine(stream *lcl.TMemoryStream) {
}
if oldCode == CODE_TABLE_SIZE {
firstChar = suffix[code]
*(*byte)(unsafe.Pointer(target)) = firstChar
target++
m.scanLine[targetIdx] = firstChar
targetIdx++
unpackedSize--
oldCode = code
continue
}
inCode = code
if code == freeCode {
*(*byte)(unsafe.Pointer(stackPointer)) = firstChar
stackPointer++
stack[stackIdx] = firstChar
stackIdx++
code = oldCode
}
for code > uint32(clearCode) {
*(*byte)(unsafe.Pointer(stackPointer)) = suffix[code]
stackPointer++
stack[stackIdx] = suffix[code]
stackIdx++
code = prefix[code]
}
firstChar = suffix[code]
*(*byte)(unsafe.Pointer(stackPointer)) = firstChar
stackPointer++
stack[stackIdx] = firstChar
stackIdx++
prefix[freeCode] = oldCode
suffix[freeCode] = firstChar
if freeCode == codeMask && codeSize < 12 {
@ -238,16 +233,16 @@ func (m *TGIFLoader) ReadScanLine(stream *lcl.TMemoryStream) {
}
oldCode = inCode
for {
stackPointer--
*(*byte)(unsafe.Pointer(target)) = *(*byte)(unsafe.Pointer(stackPointer))
target++
stackIdx--
m.scanLine[targetIdx] = stack[stackIdx]
targetIdx++
unpackedSize--
if stackPointer == uintptr(unsafe.Pointer(&stack[0])) {
if stackIdx == 0 {
break
}
}
}
sourcePtr++
sourceDataIdx++
packedSize--
}
}
@ -274,8 +269,8 @@ func (m *TGIFLoader) ReadGlobalPalette(stream *lcl.TMemoryStream) {
}
func (m *TGIFLoader) ReadGraphCtrlExt() {
m.isTransparent = (m.gifGraphicsCtrlExt.Packedbit & ID_TRANSPARENT) != 0
m.disposalMethod = (m.gifGraphicsCtrlExt.Packedbit & 0x1C) >> 2
m.isTransparent = (m.gifGraphicsCtrlExt.PackedBit & ID_TRANSPARENT) != 0
m.disposalMethod = (m.gifGraphicsCtrlExt.PackedBit & 0x1C) >> 2
if m.isTransparent {
// 如果透明位图更改alpha通道
m.gifBackgroundColor = m.gifGraphicsCtrlExt.ColorIndex

10
cef/gifplay/play.go
View File

@ -42,14 +42,6 @@ const (
AlphaOpaque uint16 = 0xFFFF
)
const (
SoFromBeginning = iota
SoFromCurrent
SoFromEnd
)
type PByte = uintptr
type TRGB struct {
Red, Green, Blue byte
}
@ -168,7 +160,7 @@ func (m *TGIFPlay) ResetImage() {
m.currentImage = 0
canvas := m.currentView.Canvas()
canvas.Brush().SetColor(m.Color())
canvas.FillRect(types.TRect{Left: 0, Top: 0, Right: m.Width(), Bottom: m.Height()})
canvas.FillRect(types.Rect(0, 0, m.Width(), m.Height()))
}
func (m *TGIFPlay) LoadFromFile(filePath string) {