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Subject: AAFont字体描边及32位图像处理 [Print This Page]

Author: croslq Time: 2005-10-10 09:38 Subject: AAFont字体描边及32位图像处理

使用BeginPath, EndPath, FillPath函数
下载地址: http://lqcros.go1.wy8.net/NewAAFont2.63.rar

我觉得要制作更多的字体效果的话，最好是用，32位图像来制作
TBitmap就支持这个功能，不过，图像合成时需要一个函数CombineAlphaPixel(函数附后，这个函数是FLib里的)
使用Bitmap时请把他设成32位的,如: PixelFormat := pf32Bit;

//===================================================================
// 计算两个32bit象素的等效象素，这个函数非常重要(speed)，安全检查就不做了
// cr1：背景 cr2：前景

// 这两个函数引用自FLIB //
// 只处理目标ALPHA通道时,两个函数可以替换到用 //

//

注意这里一下, 替换时请在DrawTo,DrawFrom 里面替换就可以了

//这个函数是以目标像素及源像素的Alpha通道合成
procedure  TBitmap32.CombineAlphaPixel(var pDest: TRGBQuad; cr1: TRGBQuad; nAlpha1: integer; cr2: TRGBQuad; nAlpha2: integer);
var
nTmp1, nTmp12, nTemp, nTmp2: integer;
begin
if ((nAlpha1 <> 0) or (nAlpha2 <> 0)) then
begin
if (nAlpha2 = 0) then
begin
pDest.rgbBlue  := cr1.rgbBlue ;
pDest.rgbGreen := cr1.rgbGreen ;
pDest.rgbRed  := cr1.rgbRed ;
pDest.rgbReserved := nAlpha1 ;
exit;
end;
if ((nAlpha1 = 0) or (nAlpha2 = $FF)) then
begin
pDest.rgbBlue  := cr2.rgbBlue ;
pDest.rgbGreen := cr2.rgbGreen ;
pDest.rgbRed := cr2.rgbRed ;
pDest.rgbReserved := nAlpha2 ;
exit;
      end;

// 以下用不着判断[0,0xFF]，我验算过了
nTmp1 := $FF * nAlpha1;
      nTmp2 := $FF * nAlpha2 ;
nTmp12 := nAlpha1 * nAlpha2;
nTemp  := nTmp1 + nTmp2 - nTmp12 ;
pDest.rgbBlue  := (nTmp2 * cr2.rgbBlue  + (nTmp1 - nTmp12) * cr1.rgbBlue)  div nTemp ;
pDest.rgbGreen := (nTmp2 * cr2.rgbGreen + (nTmp1 - nTmp12) * cr1.rgbGreen) div nTemp ;
pDest.rgbRed := (nTmp2 * cr2.rgbRed + (nTmp1 - nTmp12) * cr1.rgbRed) div nTemp ;
pDest.rgbReserved := nTemp div $FF ;

// 下面的代码是未优化过的，可读性更好些
{
nTemp :=  $FF * (nAlpha1 + nAlpha2) - nAlpha1*nAlpha2 ;
pDest.rgbBlue  := min($FF, ($FF * cr2.rgbBlue  * nAlpha2 + ($FF - nAlpha2) * cr1.rgbBlue  * nAlpha1) div nTemp) ;
pDest.rgbGreen := min($FF, ($FF * cr2.rgbGreen * nAlpha2 + ($FF - nAlpha2) * cr1.rgbGreen * nAlpha1) div nTemp) ;
pDest.rgbRed := min($FF, ($FF * cr2.rgbRed * nAlpha2 + ($FF - nAlpha2) * cr1.rgbRed * nAlpha1) div nTemp) ;
pDest.rgbReserved := nTemp div $FF ;
}
end
else
begin
pDest.rgbBlue  := $FF;
      pDest.rgbGreen := $FF;
      pDest.rgbRed := $FF;
pDest.rgbReserved := 0 ;
end;
end;

如:
         CombineAlphaPixel(Target^[x], Target^[x], Target^[x].rgbReserved, Source^[x - DstX], Source^[x- DstX].rgbReserved);

// 这个函数就更重要了，安全检查当然不做了:-)，根据pSrc中的alpha计算，nAlphaSrc一定要保证在0，0xFF之间

//这个函数只是以源像素的Alpha通道合成
procedure TBitmap32.AlphaBlendPixel(var pDest: TRGBQuad; pSrc: TRGBQuad);
begin
if (pSrc.rgbReserved = $FF) then
begin
      PRGBArray(pDest) := PRGBArray(pSrc);
      exit;
end;

if (pSrc.rgbReserved = 0) then
exit;
// 以下用不着判断[0,0xFF]，我验算过了

if (PRGBArray(pSrc) <> PRGBArray(pDest)) then
begin
      pDest.rgbBlue := (PSrc.rgbBlue - pDest.rgbBlue) * pSrc.rgbReserved div $FF + pDest.rgbBlue;
      pDest.rgbGreen := (PSrc.rgbGreen - pDest.rgbGreen) * pSrc.rgbReserved div $FF + pDest.rgbGreen;
      pDest.rgbRed := (PSrc.rgbRed - pDest.rgbRed) * pSrc.rgbReserved div $FF + pDest.rgbRed;
end;
end;

如:
AlphaBlendPixel(Target^[x], Source^[x]);

//

:o:o:o:o:o//
{ 把这个函数写到DrawTo函数以替换CombineAlphaPiexl

图层的概念
[
最下层是画布(就是一个TBitmap32对像,也可以是Image1.Picture.Bitmap)
跟着上面的就是图层啦,文字层什么的
]

从最下层的32位图像画起
就可以把许多个32位图层到画布上,显示出来

procedure TBitmap32.DrawTo(DstX, DstY: Integer; Tge: TBitmap);
var
x, y: integer;
TR, SR: TRect;
Source, Target: pRGBQuadArray;
begin
Tge.PixelFormat := pf32bit;
SetAlphaChannels(Tge, $FF);

Tr := Rect(0, 0, Tge.Width, Tge.Height);
SR := Rect(DstX, DstY, DstX + Width, DstY + Height);

if IntersectRect(Tr, Tr, SR) = false then
exit;

for y := Tr.Top to Tr.Bottom - 1 do
begin
      Target := Tge.ScanLine[y];
      Source := ScanLine[y - Dsty];

      for x := Tr.Left to Tr.Right - 1 do
      begin
//这里替换了
//          CombineAlphaPixel(Target^[x], Target^[x], Target^[x].rgbReserved, Source^[x - DstX], Source^[x- DstX].rgbReserved);
         AlphaBlendPixel(Target^[x], Source^[x]);
      end;

end;

end;

for i := 0 to LayerList.Count -1 do
begin
TBitmap32(LayerList.Items[i ]).DrawTo(0,0, Image1.Picture.Bitmap);
end;

}

//:o:o:o:o:o:o//

[ Last edited by croslq on 2005-10-15 at 14:39 ]

Author: croslq Time: 2005-10-10 10:21 Subject: 请高手把上面哪个函数MMX优化一下

请高手把上面哪个函数MMX优化一下,不然哪个性能就有点差了哈

Author: croslq Time: 2005-10-10 10:23 Subject: TBitmap32的可以这样实现

type
TBitmap32 := class(TBitmap)

end;

Author: croslq Time: 2005-10-10 10:25 Subject: 哈哈这样就可以处理32位图像了三

type
  TBitmap32 = class(TBitmap)
  private

  protected
  public
constructor Create; override;
destructor Destroy; override;

procedure Assign(Source: TPersistent); override;             //重载，设置为32位
procedure LoadFromFile(const Filename: string); override;    //重载，设置为32位
  end;

constructor TBitmap32.Create;
begin
inherited Create;
PixelFormat := pf32bit;
end;

destructor TBitmap32.Destroy;
begin
inherited Destroy;
end;

procedure TBitmap32.LoadFromFile(const Filename: string);
begin
inherited LoadFromFile(FileName);
PixelFormat := pf32bit;
end;

procedure TBitmap32.Assign(Source: TPersistent);
begin
inherited Assign(Source);
PixelFormat := pf32bit;
end;

Author: croslq Time: 2005-10-10 10:29 Subject: TBitmap32的可以这样实现

TBitmap32的FillRect不要使用，因为处理的颜色不是32位

procedure FillLongword(var X; Count: Integer; Value: Longword);
asm
// EAX = X
// EDX = Count
// ECX = Value
      PUSH EDI

      MOV    EDI,EAX  // Point EDI to destination
      MOV    EAX,ECX
      MOV    ECX,EDX
      TEST ECX,ECX
      JS    @exit

      REP    STOSD // Fill count dwords
@exit:
      POP    EDI
end;

procedure  TBitmap32.Clear(color: TColor32);
var
x, y: integer;
t1: int64;
begin

t1 := timegettime;
{
for y := 0 to Height-1 do
for x := 0 to Width-1 do
SetPixel(x, y, Color);
}
// ZeroMemory(GetBits, Height* width *4);

FillLongword(GetBits^[0], Width * Height, Color);

TraceString(IntToStr(timegettime-t1));

end;

Author: zjy Time: 2005-10-10 10:56

有个开放源码的 Graphi32 项目就是专门做 32 位位图处理的，里面有 MMX 优化的。
http://www.graphics32.org/

Author: zjy Time: 2005-10-10 14:10

没地方上传，也可以用附件放到论坛上来。

Author: croslq Time: 2005-10-10 14:16 Subject: 这样的说。好的

OK，知道了

Attachment: font32image.rar (2005-10-10 14:16, 90.4 K) / Download count 841
http://bbs.cnpack.org/attachment.php?aid=137

Attachment: font32image.rar (2005-10-10 14:16, 90.4 K) / Download count 729
http://bbs.cnpack.org/attachment.php?aid=138

Attachment: Project1.rar (2005-10-10 14:16, 257.01 K) / Download count 801
http://bbs.cnpack.org/attachment.php?aid=139

Author: croslq Time: 2005-10-10 14:19 Subject: 这个是你们网站的AAFont,我加了描边的

这个是你们网站的AAFont,我加了描边的,因为上次给你发了一个，不过性能不佳，
终于找到哪个原因，是因为StrokePath这个微软的函数本身就性能差

Attachment: NewAAFont2.63.rar (2005-10-10 14:19, 449.95 K) / Download count 1120
http://bbs.cnpack.org/attachment.php?aid=140

Author: zjy Time: 2005-10-10 14:29

好，那我把那些链接不能下载的帖子删除吧？

Author: croslq Time: 2005-10-12 20:34

我用G32库里的BlendLine函数(MMX优化)测试了一下，性能没有明显的提高
可能是DELPHI的编译本身就带有pentium优化

Author: croslq Time: 2005-10-12 21:07

上面这个３２位图像处理的方法，可以开发字体特效（抗锯齿，字体的纹理填充，阴影，描边及描边的纹理填充），也可以开发其他的如图像处理软件（图层什么的），只要再在里面加入一部分功能（如：画线、矩形，非规则区域选择<ALPHA通道(把ALPHA作为一个MASK处理就行)>......）。。。。。。

刘强 2005.10.13
邮箱地址：lqcros@163.com
主页地址：http://lqcros.go1.wy8.net

[ Last edited by croslq on 2005-10-13 at 14:06 ]

Author: croslq Time: 2005-10-13 08:53

font32image.rar包里面一个GraphicEx库，通过他可以打开TGA,PSD,BMP,TIFF等图像文件。
我一般是用他来打开３２位TGA图像或３２位BMP图像，然后通过３２位图像处理函数里的DrawTo函数输出到屏幕，DrawTo有２个重载函数,一个是把self写到３２位图像，一个是把self写到一般的Tbitmap。
例：
Bitmap.DrawTo(0,0,Image1.Picture.Bitmap);

刘强 2005.10.13
邮箱地址：lqcros@163.com
主页地址：http://lqcros.go1.wy8.net

[ Last edited by croslq on 2005-10-13 at 14:07 ]

Author: croslq Time: 2005-10-13 09:19

刘强 2005.10.13
邮箱地址：lqcros@163.com
主页地址：http://lqcros.go1.wy8.net

[ Last edited by croslq on 2005-10-13 at 14:07 ]

Attachment: demo.part01.rar (2005-10-13 09:19, 500 K) / Download count 888
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Attachment: demo.part02.rar (2005-10-13 09:19, 500 K) / Download count 1007
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Attachment: demo.part03.rar (2005-10-13 09:19, 279.73 K) / Download count 1026
http://bbs.cnpack.org/attachment.php?aid=143

Author: croslq Time: 2005-10-13 13:50

其实　CreateFontIndirect　这个函数就能输出抗锯齿的字体啦

Delphi这样使用：

procedure TForm1.Button1Click(Sender: TObject);
var
lf : TLogFont;
Bitmap: TBitmap;
begin
Bitmap := TBitmap.create;
Bitmap.Width := 400;
Bitmap.Height := 200;

Bitmap.Canvas.Font.Name := '华文行楷';
Bitmap.Canvas.Font.Size := 72;
Bitmap.Canvas.Font.Style := [fsBold, fsItalic, fsUnderline, fsStrikeOut];
GetObject(Bitmap.Canvas.Font.Handle, SizeOf(TLogFont), @lf);
lf.lfQuality := ANTIALIASED_QUALITY; //设置输出质量（抗锯齿）
Bitmap.Canvas.Font.Handle := CreateFontIndirect(lf);
Bitmap.Canvas.TextOut(0,0,'平滑字体');
Image1.Picture.Bitmap.Assign(Bitmap);
Bitmap.Free;
end;

刘强 2005.10.13
邮箱地址：lqcros@163.com
主页地址：http://lqcros.go1.wy8.net

[ Last edited by croslq on 2005-10-13 at 14:13 ]

Author: croslq Time: 2005-10-13 14:03

通过函数 GetGlyphOutline 可以取得 TrueType　字体的轮廓，就可以描边啦
可以参考网址:http://www.legalsoft.com.cn/articles/show.asp?id=269

也可以使用beginPath, EndPath, GetPath　提取

      FPathPoints: array of TPoint;
      FPathTypes: array of Byte;
      FNumber: Integer;
      PointIdx: integer;

  BeginPath(GrayBmp.Canvas.Handle);
SetBkMode(GrayBmp.Canvas.Handle, TRANSPARENT);
GrayBmp.Canvas.TextOut(0, 0, Text);
  EndPath(GrayBmp.Canvas.Handle);

  FNumber := GetPath(GrayBmp.Canvas.Handle, Pointer(nil^), Pointer(nil^), 0);
  SetLength(FPathPoints, FNumber);
  SetLength(FPathTypes, FNumber);
  FNumber := GetPath(GrayBmp.Canvas.Handle, FPathPoints[0], FPathTypes[0], FNumber);

  PointIdx := 0;

//+++  描边//
while PointIdx < FNumber do begin

case FPathTypes[PointIdx] of PT_MOVETO:
      begin
         GrayBmp.Canvas.MoveTo(FPathPoints[PointIdx].X, FPathPoints[PointIdx].Y);
         LastMove := FPathPoints[PointIdx];
         inc(PointIdx, 1);
      end;
      PT_LINETO:
      begin
         GrayBmp.Canvas.LineTo(FPathPoints[PointIdx].X, FPathPoints[PointIdx].Y);
         inc(PointIdx, 1);
      end;
      PT_BEZIERTO:
      begin
         PolyBezierTo(GrayBmp.Canvas.Handle, FPathPoints[PointIdx], 3);
         inc(PointIdx, 3);
      end;
      PT_LINETO or PT_CLOSEFIGURE:
      begin
         GrayBmp.Canvas.LineTo(FPathPoints[PointIdx].X, FPathPoints[PointIdx].y);
         GrayBmp.Canvas.LineTo(LastMove.x, LastMove.y);
         inc(PointIdx, 1);
      end;
      PT_BEZIERTO or PT_CLOSEFIGURE:
      begin
         PolyBezierTo(GrayBmp.Canvas.Handle, FPathPoints[PointIdx], 3);
         GrayBmp.Canvas.LineTo(LastMove.x, LastMove.y);
         inc(PointIdx, 3);
      end;
end;
end;

  SetLength(FPathPoints, 0);
  SetLength(FPathTypes, 0);

刘强 2005.10.13
邮箱地址：lqcros@163.com
主页地址：http://lqcros.go1.wy8.net

[ Last edited by croslq on 2005-10-13 at 14:07 ]

Author: croslq Time: 2005-10-15 14:44 Subject: 32位图层(随手写的,没测试,你们看一下原理就行了哈:P)

type
TLayerList = class(TList)
private

end;

Bitmap32 : TBitmap32;
LayerList := TLayerList.Create;

Bitmap32 := TBitmap32.Create;
Bitmap32.LoadFromFile('1.tga');
LayerList.Items.add(Bitmap32);

for i := 0 to LayerList.Count -1 do
begin
TBitmap32(LayerList.Items[i ]).DrawTo(0,0, Image1.Picture.Bitmap);
end;

for i := 0 to LayerList.Count -1 do
begin
TBitmap32(LayerList.Items[i ]).Free;
end;
LayerList.Free;

刘强 2005.10.13
邮箱地址：lqcros@163.com
主页地址：http://lqcros.go1.wy8.net

[ Last edited by croslq on 2005-10-15 at 14:45 ]

Author: croslq Time: 2005-10-15 18:02 Subject: MMX优化AlphaBlendPixel

//                            TColor32(AARRGGBB)    TColor32       0 .. 255
//                               |          |             |
//             AlphaBlendPixel(Source^[x], Target^[x], AlphaComponent(Source^[x]));
procedure AlphaBlendPixel(Source: TColor32; var Target: TColor32; Alpha: DWORD);
asm
MOVD          MM1, EAX       // MM1 = 00 00 00 00 ** Fr Fg Fb
MOVD          MM2,[EDX]    // MM2 = 00 00 00 00 ** Br Bg Bb
PUNPCKLBW MM1, MM0    // MM1 = 00 ** 00 Fr 00 Fg 00 Fb
MOVD          MM3, ECX    // MM3 = 00 00 00 00 00 00 00 AA
PUNPCKLBW MM2, MM0    // MM2 = 00 ** 00 Br 00 Bg 00 Bb
PSHUFW    MM3, MM3, 0 // MM3 = 00 AA 00 AA 00 AA 00 AA
PSUBW       MM1, MM2
PSLLW       MM2, 8
PMULLW    MM1, MM3
PADDW       MM1, MM2
PSRLW       MM1, 8
PACKUSWB MM1, MM0
MOVD          [EDX],MM1
emms
end;

[ Last edited by croslq on 2005-10-15 at 20:30 ]

Author: croslq Time: 2005-10-17 15:40 Subject: 抗锯齿直线的实现

附件里的自定义的画笔(掩码图)，它本身边缘就是羽化了的，所以就能抗锯齿
下面画线函数，首先确定直线的每一点的坐标，然后把自定义画笔画到这个坐标上，直到画完线

（这个抗锯齿直线就画起了三）

这个方法还可以反走样字体的边缘啦
在哪个EndPath后面
加一个FlattenPath函数（平整为直线的）
16楼哪个画直线函数用这个函数替换

procedure DrawMaskPen(TargetBitmap: TBitmap; DstX, DstY: Integer; Mask8: TBitmap);
var
Source, Target: PByteArray;
TR, SR: TRect;
x, y: integer;
begin

TR := Rect(0, 0, TargetBitmap.Width, TargetBitmap.Height);
SR := Rect(DstX, DstY, DstX + Mask8.Width, DstY + Mask8.Height);

if IntersectRect(TR, TR, SR) = false then
exit;

for y := Tr.Top to Tr.Bottom - 1 do
begin
      Target := TargetBitmap.ScanLine[y];
      Source := Mask8.ScanLine[y - Dsty];
      for x := TR.Left to Tr.Right - 1 do
      begin
         if (Target^[x] + Source^[x - Dstx]) > 255 then
         Target^[x] := 255
         else
         Target^[x] := Target^[x] + Source^[x - Dstx];
      end;
end;
end;

//采用Bresenham算法绘制一条颜色相同的直线
//将Bresenham算法写成统一的形式
//x1, y1, x2, y2直线的起点和端点
//通过附件里自定义的画笔,实现了8位蒙板图画抗锯齿直线

procedure LineMaskPen(Target8: TBitmap; x1, y1, x2, y2: integer; MaskPen8: TBitmap);
var
nDx, nDy: integer;
nIx, nIy: integer;
nInc: integer;
nJudgeX, nJudgeY: integer;
x, y: integer;
nTwoIx, nTwoIy: integer;
i: integer;
bPlot: boolean;

begin
//两端点间的水平偏移量和垂直偏移量
nDx := x2 - x1;
nDy := y2 - y1;

//两端点间的水平距离和垂直距离
nIx := ABS(nDx);
nIy := ABS(nDy);

//描点步数(增量总值)
nInc := MAX(nIx, nIy);

//绘制第一个点, 即, 直线的起点
// SetPixel(hdc, x1, y1, clr);
DrawMaskPen(Target, x1- MaskPen8.Width div 2, y1 - MaskPen8.Height div 2, MaskPen8);

//不包含终点
if(nInc < 2) then
exit;

//用于判断是否在nJudgeX, nJudgeY方向上向前进
nJudgeX := -nIy;
nJudgeY := -nIx;

//通过增量计算得到的当前点
x := x1;
y := y1;

//开始进行增量计算
//采用Bresenham算法.在这里, 我们将算法进行改进,
//使其对于任意斜率的直线都能绘制, 而且绘制方向始终为从起点绘制到终点

//注意, 整数乘2在计算机中采用移位实现
//Bresenham算法
nTwoIx := 2 * nIx;
nTwoIy := 2 * nIy;

//与Windows相对应, 该算法也不包含最后一个点(x2, y2)
dec(nInc);

//开始增量计算
for i := 0  to nInc -1 do
begin
nJudgeX := nJudgeX + nTwoIx;
nJudgeY := nJudgeY + nTwoIy;

//通过增量法计算的当前点是否属于直线上的点
bPlot := FALSE;

//检测 X 方向
if(nJudgeX >= 0) then
begin
bPlot := TRUE;
nJudgeX := nJudgeX - nTwoIy;

//将任意走向的直线统一起来
if(nDx > 0) then
         inc(x)
else if(nDx < 0) then
         dec(x)
end;

//检测 Y 方向
if(nJudgeY >= 0) then
begin
bPlot := TRUE;
nJudgeY := nJudgeY - nTwoIx;

//将任意走向的直线统一起来
if(nDy > 0) then
         inc(y)
else if(nDy < 0) then
         dec(y);
end;
//如果当前点在直线上, 则绘制当前点
if(bPlot) then
//       SetPixel(hdc, x, y, clr);
      DrawMaskPen(Target, x- MaskPen8.Width div 2, y- MaskPen8.Height div 2, MaskPen8);
end;//end for
end;

//画32位色直线这样画啦
var
Bitmap: TBitmap32;
Mask: TBitmap;
begin
Bitmap := TBitmap32.Create;
Bitmap.Width := 500;
Bitmap.Height := 500;
Mask := TBitmap.Create;
Mask.Width := 500;
Mask.Height := 500;

Image1.Picture.Bitmap.PixelFormat := pf8bit;
LineMaskPen(Mask, 0, 0, 200, 200, Image1.Picture.Bitmap);  //Image1.Picture.Bitmap 这里保存的是附件里的8位自定义画笔

Bitmap.Clear($FFFF0000);       //设为红色
Bitmap.SetAlphaChannels(Mask); //只有线条显示

Bitmap.Free;
end;

[ Last edited by croslq on 2005-10-17 at 15:53 ]

Image Attachment: pen08.jpg (2005-10-17 15:40, 1.02 K) / Download count 913
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Image Attachment: pen13.jpg (2005-10-17 15:40, 1.16 K) / Download count 840
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Author: croslq Time: 2005-10-20 08:29 Subject: 定义一个画笔类

定义画笔公用类，就像Windows里的CreatePen，
通过这个函数直接生成自定义大小的反走样8位Bitmap。

//生成掩码灰度画笔

TPenMaskBitmap = class(TBitmap)
public
constructor Create; override;
destructor Destroy; override;
procedure CreateMaskBitmap(w, h: integer);
end;

constructor TPenMaskBitmap.Create;
begin
inherited Create;
PixelFormat := pf8bit;
end;

destructor TPenMaskBitmap.Destroy;
begin
inherited Destroy;
end;

procedure TPenMaskBitmap.CreateMaskBitmap(w, h: integer);
begin
//这里省了哈

end;

// 这个类在程序启动时就运行，在程序完了时就释放；
// 这个类直接生成32位色画笔，可以设定颜色，纹理，大小，透明度什么的。

TPenBitmap = class(TBitmap) // class(TBitmap32)

public
constructor Create; override;
destructor Destroy; override;
procedure CreateBitmap(w, h: integer);
end;

constructor TPenBitmap.Create;
begin
inherited Create;
PixelFormat := pf32bit;
end;

destructor TPenBitmap.Destroy;
begin
inherited Destroy;
end;

procedure TPenMaskBitmap.CreateMaskBitmap(w, h: integer);
begin
//这里省了哈

end;

Author: croslq Time: 2005-10-21 13:23 Subject: 反走样直线

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, Image32;

type
  TForm1 = class(TForm)
Image1: TImage;
Button1: TButton;
procedure Button1Click(Sender: TObject);
  private
{ Private declarations }
  public
{ Public declarations }
  end;

var
  Form1: TForm1;

procedure AALine(x1,y1,x2,y2 : single; color: TColor32; Bitmap: TBitmap32);

implementation

{$R *.dfm}

procedure AALine(x1, y1, x2, y2: single; color: TColor32; Bitmap: TBitmap32);

function CrossFadeColor(FromColor, ToColor: TColor32; Rate: Single) : TColor32;
var
      R,G,B,A: BYTE;
begin
//    r := Round(RedComponent(FromColor) * Rate + RedComponent(ToColor) * (1 - Rate));
//    g := Round(GreenComponent(FromColor) * Rate + GreenComponent(ToColor) * (1 - Rate));
//    b := Round(BlueComponent(FromColor) * Rate + BlueComponent(ToColor) * (1 - Rate));
//    a := Round(AlphaComponent(FromColor) * Rate + AlphaComponent(ToColor) * (1 - Rate));
      r := RedComponent(FromColor);
      g := GreenComponent(FromColor);
      b := BlueComponent(FromColor);
      a := Round(AlphaComponent(FromColor) * Rate);

   Result := RGBA(r,g,b,a); //RGB(b,g,r);
end;

// type
//    intarray = array[0..1] of integer;
//    pintarray = ^intarray;

procedure hpixel(x : single; y : integer);
var
  FadeRate : single;
begin
  FadeRate := x - trunc(x);
  with bitmap do
  begin
if (x>=0) and (y>=0) and (height>y) and (width>x) then
      pColor32array(bitmap.ScanLine[y])[trunc(x)] := CrossFadeColor(Color,pColor32array(bitmap.ScanLine[y])[trunc(x)],1-FadeRate);

if (trunc(x)+1>=0) and (y>=0) and (height>y) and (width>trunc(x)+1) then
      pColor32array(bitmap.ScanLine[y])[trunc(x)+1]:=CrossFadeColor(Color,pColor32array(bitmap.ScanLine[y])[trunc(x)+1],FadeRate);
  end;
end;

procedure vpixel(x : integer; y : single);
var
  FadeRate : single;
begin
  FadeRate:=y-trunc(y);
  with bitmap do
  begin
if (x>=0) and (trunc(y)>=0) and (height>trunc(y)) and (width>x) then
                     pColor32array(bitmap.ScanLine[trunc(y)])[x]:=CrossFadeColor(Color,pColor32array(bitmap.ScanLine[trunc(y)])[x],1-FadeRate);

      if (x>=0) and (trunc(y)+1>=0) and (height>trunc(y)+1) and (width>x) then
      pColor32array(bitmap.ScanLine[trunc(y)+1])[x]:=CrossFadeColor(Color,pColor32array(bitmap.ScanLine[trunc(y)+1])[x],FadeRate);
      end;
end;

var i: integer;
ly, lx, currentx, currenty, deltax, deltay, l, skipl: single;
begin
  if (x1 <> x2) or (y1 <> y2) then
  begin
// bitmap.PixelFormat := pf32Bit;
// Bitmap.Clear($00000000);

currentx := x1;
currenty := y1;
lx := abs(x2 - x1);
ly := abs(y2 - y1);

if lx > ly then
begin
   l := trunc(lx);
   deltay := (y2-y1)/l;
   if x1 > x2 then
   begin
      deltax := -1;
      skipl  := (currentx - trunc(currentx));
   end
   else
   begin
      deltax := 1;
      skipl  := 1- (currentx - trunc(currentx));
   end;
end
else
begin
   l    :=  trunc(ly);
   deltax := (x2-x1)/l;
   if y1 > y2 then
   begin
      deltay := -1;
      skipl := (currenty-trunc(currenty));
   end
   else
   begin
      deltay := 1;
      skipl  := 1-(currenty-trunc(currenty));
   end;
end;

currentx := currentx+deltax*skipl;
currenty := currenty+deltay*skipl;{}

for i := 1 to trunc(l) do
begin
   if lx > ly then
      vpixel(trunc(currentx), currenty)
   else
      hpixel(currentx, trunc(currenty));

   currentx := currentx + deltax;
   currenty := currenty + deltay;
end;
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
bitmap: TBitmap32;
begin
Bitmap := TBitmap32.Create;
Bitmap.Width := 400;
Bitmap.Height := 400;

Image1.picture.Bitmap.Width := 400;
Image1.picture.Bitmap.Height := 400;

AALine(0,0, 300,100, $FFFF0000, Bitmap);
Bitmap.DrawTo(0,0,Image1.Picture.Bitmap);

Bitmap.Free;
end;

end.

Author: croslq Time: 2005-12-4 11:13

影音风暴开源项目：guliverkli
里面Subtitles有实现字幕描边，阴影代码(我觉得性能还是很好的啦）

附件里有摘录的部分代码,是关于实现字幕的（C++）

字幕编辑器（Subresync）：字体输出效果

Image Attachment: PhoXo1.jpg (2005-12-4 11:13, 179.84 K) / Download count 642
http://bbs.cnpack.org/attachment.php?aid=182

Attachment: subtitles.rar (2005-12-4 11:13, 277.03 K) / Download count 628
http://bbs.cnpack.org/attachment.php?aid=183

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