Delphi图像处理 -- 颜色矩阵变换

阅读提示:

    《Delphi图像处理》系列以效率为侧重点,一般代码为PASCAL,核心代码采用BASM。

    《C++图像处理》系列以代码清晰,可读性为主,全部使用C++代码。

    尽可能保持二者内容一致,可相互对照。

    本文代码必须包括文章《Delphi图像处理 -- 数据类型及公用过程》中的ImageData.pas单元

 

    本文在《GDI+ ColorMatrix的完全揭秘》的ColorMatrix原理揭秘的基础上,用Delphi代码来完整实现GDI+的ColorMatrix功能。

    GDI+中设置ColorMatrix时有2个枚举选项,在实际运用中极少使用,所以代码中以GDI+设置ColorMatrix的缺省方式实现。

    先给一个简易的浮点版本,因为该过程没有考虑子图处理,所以称之为简易版本,主要方便阅读者理解ColorMatrix实现原理:

procedure SetColorMatrixF(Data: TImageData; Matrix: TColorMatrix);
var
  I, J, Count: Integer;
  P: PRGBQuad;
  MainValue: Boolean;
  v: Integer;

  procedure SetPixel;
  var
    Pixel: array[0..3] of Byte;
    I, J: Integer;
    ps: PByteArray;
  begin
    ps := Pointer(P);
    // 注意:为使矩阵与ARGB排列顺序一致,以下运算中调整了行列的顺序 
    for I := 0 to 3 do
    begin
      if I < 3 then
        J := 2 - I
      else
        J := I;
      // 如果只存在主对角线数据,只处理颜色缩放 
      if MainValue then
        Pixel[J] := Round(Matrix[I, I] * ps[J])
      // 否则,处理所有颜色变换 
      else
        Pixel[J] := Max(0, Min(255, Round(Matrix[0, I] * ps[2] +
                                          Matrix[1, I] * ps[1] +
                                          Matrix[2, I] * ps[0] +
                                          Matrix[3, I] * ps[3] +
                                          Matrix[4, I] * 255)));
    end;
    for I := 0 to 3 do
      ps[I] := Pixel[I];
  end;

begin
  // 处理矩阵中大与255的值(取模),并判断主对角线外是否存在数据 
  MainValue := True;
  for I := 0 to 4 do
    for J := 0 to 4 do
    begin
      v := Round(Matrix[I, J]) div 256;
      if v > 0 then
        Matrix[I, J] := Matrix[I, J] - 256.0 * v;
      if (I <> J) and (Matrix[I, J] <> 0) then
        MainValue := False;
    end;
  Count := Data.Width * Data.Height;
  P := Data.Scan0;
  for I := 1 to Count do
  begin
    SetPixel;
    Inc(P);
  end;
end;

    因代码已经有了注释,而实现原理、公式已经在《GDI+ ColorMatrix的完全揭秘》中进行了详尽的介绍,所以本文不再累述。 

    该过程代码的特点是简单易读,缺点是效率较低,在我的P4 2.8G计算机上,处理一张千万像素的照片,耗时为1000ms左右(不包括GDI+图像格式转换耗时。千万像素的24位格式图像转换为32位格式,耗时就达650ms)。

    下面是一个MMX BASM代码的整数ColorMatrix实现过程: 

过程定义:

  // 设置图像颜色矩阵。参数:
  //   Dest输出图,Source原图,Data自身操作图像
  //   Matrix颜色矩阵
  procedure ImageSetColorMatrix(var Data: TImageData; Matrix: TColorMatrix); overload;
    {$IF RTLVersion >= 17.00}inline;{$IFEND}
  procedure ImageSetColorMatrix(var Dest: TImageData;
    const Source: TImageData; Matrix: TColorMatrix); overload;

实现代码:

type
  PARGBQuadW = ^TARGBQuadW;
  TARGBQuadW = packed record
    wBlue: Word;
    wGreen: Word;
    wRed: Word;
    wAlpha: Word;
  end;

procedure ImageSetColorMatrix(var Dest: TImageData;
  const Source: TImageData; Matrix: TColorMatrix);
asm
    push        esi
    push        edi
    push        ebx
    mov         ebx, eax
    mov         edi, ecx        // edi = matrix
    mov         esi, 4          // for (i = 4; i >= 0; i --)
    fldz                        // {
@@iLoop:
    mov         ecx, 4          //   for (j = 4; j >= 0; j --)
@@jLoop:                        //   {
    cmp         ecx, esi
    je          @@1
    mov         eax, esi
    imul        eax, 5
    add         eax, ecx
    fcom        dword ptr [edi+eax*4]
    fstsw       ax
    sahf
    je          @@1
    fstp        st(0)           //     if (i != j && matrix[i, j] != 0)
    jmp         @@TransformAll  //       goto TransformAll
@@1:
    dec         ecx
    jns         @@jLoop         //   }
    dec         esi
    jns         @@iLoop         // }
    fstp        st(0)
    fwait

    // 处理颜色缩放(主对角线的数据)

    sub         esp, 8+2
    mov         dword ptr [esp], 256
    fild        dword ptr [esp]
    fld         st(0)
    fmul        dword ptr [edi+(2*5+2)*4]
    fistp       dword ptr [esp]     // matrixI[0, 0] = matrix[2, 2] * 256
    fld         st(0)
    fmul        dword ptr [edi+(1*5+1)*4]
    fistp       dword ptr [esp+2]   // matrixI[0, 1] = matrix[1, 1] * 256
    fld         st(0)               
    fmul        dword ptr [edi+(0*5+0)*4]
    fistp       dword ptr [esp+4]   // matrixI[0, 2] = matrix[0, 0] * 256
    fmul        dword ptr [edi+(3*5+3)*4]
    fistp       dword ptr [esp+6]   // matrixI[0, 3] = matrix[3, 3] * 256
    mov         eax, ebx
    call        _SetCopyRegs
    pxor        mm7, mm7
    movq        mm1, [esp]      // mm1 = m44  m11  m22  m33
@@yLoop:
    push        ecx
@@xLoop:
    movd        mm0, [esi]
    punpcklbw   mm0, mm7        // mm0 = 00  A 00  R 00  G 00  B
    pmullw      mm0, mm1        // mm0 = A*m44 R*m11 G*m22 B*m33
    psrlw       mm0, 8          // mm0 = A*m44/256 R*m11/256 G*m22/256 B*m33/256
    packuswb    mm0, mm0        // mm0 = 00 00 00 00 An Rn Gn Bn
    movd        [edi], mm0
    add         esi, 4
    add         edi, 4
    loop        @@xLoop
    add         esi, eax
    add         edi, ebx
    pop         ecx
    dec         edx
    jnz         @@yLoop
    add         esp, 8+2
    jmp         @@end

    // 处理全部颜色变换

@@TransformAll:
    sub         esp, 5*8+2      // 浮点颜色矩阵行列交换转换为128倍整数
    mov         dword ptr [esp], 128
    fild        dword ptr [esp]
    mov         esi, esp        // esi = matrixI
    mov         eax, edi
    mov         ecx, 4          // for (i = 0; i < 4; i ++)
@@cvtLoop:                      // {
    fld         st(0)
    fmul        dword ptr [edi]
    fistp       dword ptr [esi]     // matrixI[i, 0] = matrix[0, i] * 128
    fld         st(0)
    fmul        dword ptr [edi+1*5*4]
    fistp       dword ptr [esi+2]   // matrixI[i, 1] = matrix[1, i] * 128
    fld         st(0)
    fmul        dword ptr [edi+2*5*4]
    fistp       dword ptr [esi+4]   // matrixI[i, 2] = matrix[2, i] * 128
    fld         st(0)
    fmul        dword ptr [edi+3*5*4]
    fistp       dword ptr [esi+6]   // matrixI[i, 3] = matrix[3, i] * 128
    add         esi, 8
    add         edi, 4
    loop        @@cvtLoop       // }
    fstp        st(0)
    add         eax, 4*5*4      // 浮点数平移量转换为255倍整数
    mov         dword ptr [esi], 255
    fild        dword ptr [esi]
    mov         ecx, 4          // for (j = 0; j < 4; j ++)
@@tLoop:
    fld         st(0)
    fmul        dword ptr [eax]
    fistp       dword ptr [esi]     // matrixI[4, j] = matrix[4, j] * 255
    add         esi, 2
    add         eax, 4
    loop        @@tLoop
    fstp        st(0)
    mov         esi, esp        // 红蓝(0、2列)交换
    mov         ecx, 5          // for (i = 0; i < 5; i ++)
@@swapLoop:                     //   matrixI[i, 0] <--> matrixI[i, 2]
    mov         ax, [esi].TARGBQuadW.wBlue
    xchg        ax, [esi].TARGBQuadW.wRed
    mov         [esi].TARGBQuadW.wBlue, ax
    add         esi, 8
    loop        @@swapLoop
    mov         eax, ebx
    call        _SetCopyRegs
    pxor        mm7, mm7
    pcmpeqb     mm4, mm4        // mm4 = FF FF FF FF FF FF FF FF
    psrlw       mm4, 15         // mm4 = 00 01 00 01 00 01 00 01
@@yLoopA:
    push        ecx
@@xLoopA:
    movd        mm0, [esi]
    punpcklbw   mm0, mm7        // mm0 = 00  A 00  R 00  G 00  B
    movq        mm1, mm0
    movq        mm2, mm0
    movq        mm3, mm0
    // esp+4: ecx push stack
    pmaddwd     mm0, [esp+16+4] // mm0 = A*m43+R*m13  G*m23+B*m33  蓝色行
    pmaddwd     mm1, [esp+8+4]  // mm1 = A*m42+R*m12  G*m22+B*m32  绿色行
    pmaddwd     mm2, [esp+4]    // mm2 = A*m41+R*m11  G*m21+B*m31  红色行
    pmaddwd     mm3, [esp+24+4] // mm3 = A*m44+R*m14  G*m24+B*m34  Alpha行
    psrad       mm0, 7          // mm0 = A*m43+R*m13/128  G*m23+B*m33/128
    psrad       mm1, 7          // mm1 = A*m42+R*m12/128  G*m22+B*m32/128
    psrad       mm2, 7          // mm2 = A*m41+R*m11/128  G*m21+B*m31/128
    psrad       mm3, 7          // mm3 = A*m44+R*m14/128  G*m24+B*m34/128
    packssdw    mm0, mm1        // mm0 = Ag+Rg  Gg+Bg  Ab+Rb  Gb+Bb
    packssdw    mm2, mm3        // mm2 = Aa+Ra  Ga+Ba  Ar+Rr  Gr+Br
    pmaddwd     mm0, mm4        // mm0 = Ag+Rg+Gg+Bg=Gn  Ab+Rb+Gb+Bb=Bn
    pmaddwd     mm2, mm4        // mm2 = Aa+Ra+Ga+Ba=An  Ar+Rr+Gr+Br=Rn
    packssdw    mm0, mm2        // mm0 = 00 An 00 Rn 00 Gn 00 Bn   
    paddw       mm0, [esp+32+4] // mm0 = An+At Rn+Rt Gn+Gt Bn+Bt   平移行
    packuswb    mm0, mm0        // mm0 = 00 00 00 00 An Rn Gn Bn
    movd        [edi], mm0
    add         esi, 4
    add         edi, 4
    loop        @@xLoopA
    add         esi, eax
    add         edi, ebx
    pop         ecx
    dec         edx
    jnz         @@yLoopA
    add         esp, 5*8+2
@@end:
    emms
@@Exit:
    pop         ebx
    pop         edi
    pop         esi
end;

procedure ImageSetColorMatrix(var Data: TImageData; Matrix: TColorMatrix);
begin
  ImageSetColorMatrix(Data, Data, Matrix);
end;

    该过程中作了更详细的注释,其特点是处理速度较快。在我的机器上,不包括图像格式转换耗时,处理千万像素图片主对角线数据耗时不到50ms,而处理全部变换耗时350-400ms。  

    下面是一个测试程序代码。该测试代码界面与《GDI+ for VCL基础 -- 颜色调整矩阵ColorMatrix详解》是一样的。有兴趣的朋友可以同里面的测试代码作一下比较。  

unit main2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Buttons, Grids, ExtCtrls, Gdiplus, ImageData;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    PaintBox1: TPaintBox;
    SpeedButton1: TSpeedButton;
    SpeedButton2: TSpeedButton;
    SpeedButton3: TSpeedButton;
    SpeedButton4: TSpeedButton;
    StringGrid1: TStringGrid;
    BitBtn1: TBitBtn;
    BitBtn3: TBitBtn;
    BitBtn2: TBitBtn;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
      Rect: TRect; State: TGridDrawState);
    procedure StringGrid1GetEditText(Sender: TObject; ACol, ARow: Integer;
      var Value: string);
    procedure PaintBox1Paint(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
    procedure BitBtn3Click(Sender: TObject);
    procedure SpeedButton2Click(Sender: TObject);
    procedure SpeedButton3Click(Sender: TObject);
    procedure SpeedButton1Click(Sender: TObject);
    procedure SpeedButton4Click(Sender: TObject);
    procedure StringGrid1SetEditText(Sender: TObject; ACol, ARow: Integer;
      const Value: string);
  private
    { Private declarations }
    Source: TGpBitmap;
    Dest: TGpBitmap;
    SrcData: TImageData;
    DstData: TImageData;
    Matrix: TColorMatrix;

    function CheckFloatStr(Str: string): Double;
    procedure InitColorMatrix;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
  ImageSetColorMatrix(DstData, SrcData, Matrix);
  PaintBox1.Invalidate;
  with StringGrid1 do
  begin
    Cells[Col, Row] := FloatToStr(Matrix[Row, Col]);
    Invalidate;
    SetFocus;
  end;
end;

procedure TForm1.BitBtn2Click(Sender: TObject);
begin
  InitColorMatrix;
  BitBtn1.Click;
end;

procedure TForm1.BitBtn3Click(Sender: TObject);
begin
  Close;
end;

function TForm1.CheckFloatStr(Str: string): Double;
var
  i, len: Integer;
  dec, neg: Boolean;
  s: string;
begin
  Result := 0;
  len := Length(Str);
  if len = 0 then Exit;
  dec := False;
  neg := False;
  i := 1;
  s := '';
  if (Str[i] = '-') or (Str[i] = '+') then
  begin
    if Str[i] = '-' then neg := True;
    Inc(i);
  end;
  while (i <= len) do
  begin
    if Str[i] = '.' then
    begin
      if dec then Break;
      dec := True;
    end
    else if (Str[i] < '0') or (Str[i] > '9') then Break;
    s := s + Str[i];
    Inc(i);
  end;
  if Length(s) > 0 then
  begin
    if neg then s := '-' + s;
    Result := StrToFloat(s);
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  Bmp: TGpBitmap;
  Data: TBitmapData;
  R: TGpRect;
begin
  // 从文件装入图像到Bmp
  Bmp := TGpBitmap.Create('..\..\media\100_0349.jpg');
  R := GpRect(0, 0, Bmp.Width, Bmp.Height);
  // 分别建立新的源和目标图像数据到SrcData和DstData
  SrcData := NewImageData(R.Width, R.Height);
  DstData := NewImageData(R.Width, R.Height);
  // 将Bmp图像数据分别锁定拷贝到SrcData和DstData
  Data := TBitmapData(SrcData);
  Data := Bmp.LockBits(R, [imRead, imWrite, imUserInputBuf], pf32bppARGB);
  Bmp.UnlockBits(Data);
  Data.Scan0 := DstData.Scan0;
  Data := Bmp.LockBits(R, [imRead, imWrite, imUserInputBuf], pf32bppARGB);
  Bmp.UnlockBits(Data);
  Bmp.Free;
	// 分别用图像数据SrcData和DstData建立位图Source和Dest
	// 注:图像数据结构用于数据处理,位图用于显示,这样即可绑定数据结构和位图,
	//     又能避免每次处理图像数据时的锁定和解锁操作
  Source := TGpBitmap.Create(SrcData.Width, SrcData.Height, SrcData.Stride,
		pf32bppARGB, SrcData.Scan0);
  Dest := TGpBitmap.Create(DstData.Width, DstData.Height, DstData.Stride,
		pf32bppARGB, DstData.Scan0);

  InitColorMatrix;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Dest.Free;
  Source.Free;
  FreeImageData(DstData);
  FreeImageData(SrcData);
end;

procedure TForm1.InitColorMatrix;
var
  i, j: Integer;
begin
  for i := 0 to 4 do
  begin
    for j := 0 to 4 do
      if i = j then Matrix[i, j] := 1 else Matrix[i, j] := 0;
  end;
end;

procedure TForm1.PaintBox1Paint(Sender: TObject);
var
  g: TGpGraphics;
begin
  g := TGpGraphics.Create(PaintBox1.Canvas.Handle);
  try
    g.DrawImage(Source, 10, 10);
    g.DrawImage(Dest, SrcData.Width + 20, 10);
  finally
    g.Free;
  end;
end;

procedure TForm1.SpeedButton1Click(Sender: TObject);
var
  i: Integer;
begin
	InitColorMatrix;
	for i := 0 to 2 do
  begin
    Matrix[0, i] := 0.30;
    Matrix[1, i] := 0.59;
    Matrix[2, i] := 0.11;
  end;
	BitBtn1.Click;
end;

procedure TForm1.SpeedButton2Click(Sender: TObject);
var
  i: Integer;
begin
	InitColorMatrix;
	for i := 0 to 2 do
		Matrix[4, i] := 0.10;
	BitBtn1.Click;
end;

procedure TForm1.SpeedButton3Click(Sender: TObject);
begin
  InitColorMatrix;
  Matrix[0, 0] := -1;
  Matrix[1, 1] := -1;
  Matrix[2, 2] := -1;
  BitBtn1.Click;
end;

procedure TForm1.SpeedButton4Click(Sender: TObject);
begin
  InitColorMatrix;
  Matrix[3, 3] := 0.5;
  BitBtn1.Click;
end;

procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
  Rect: TRect; State: TGridDrawState);
var
  Text: string;
begin
  Text := Format('%.2f', [Matrix[ARow, ACol]]);
  StringGrid1.Canvas.FillRect(Rect);
  StringGrid1.Canvas.Pen.Color := clBtnShadow;
  StringGrid1.Canvas.Rectangle(Rect);
  InflateRect(Rect, -2, -2);
  DrawText(StringGrid1.Canvas.Handle, PChar(text), Length(text), &Rect, DT_RIGHT);
end;

procedure TForm1.StringGrid1GetEditText(Sender: TObject; ACol, ARow: Integer;
  var Value: string);
begin
  Value := Format('%.2f', [Matrix[ARow, ACol]]);
end;

procedure TForm1.StringGrid1SetEditText(Sender: TObject; ACol, ARow: Integer;
  const Value: string);
begin
  Matrix[ARow, ACol] := CheckFloatStr(Value);
end;

end.

     下面是运行效果图:

Delphi图像处理 -- 颜色矩阵变换_第1张图片
    该效果图是个处理-1矩阵实现图像取反的画面,仔细观察右边的取反图,不难发现其中有不少黑色的点,尤其是画面右上角“圣亚”2个字下面,更是出现一些难看的色斑,这些问题在《 GDI+ ColorMatrix的完全揭秘》中已经作了详细的解说。其实这个问题完全可以进行改进,但本文的目的是揭秘和完整实现,改进后,一些非主要效果肯定会与“正版”不一样。^_^
 
后记(2012/12/20):
    昨天整理BLOG,更新《C++图像处理 -- 颜色矩阵变换》文章时,却发现Win7环境下的GDI+ 颜色矩阵变换效果同XP环境下的效果有很大不同(比如前面例子运行的反色效果图在Win7中为黑色图),而本文前面的颜色矩阵变换代码是仿XP效果写的,因此,重新写了一段仿Win7 GDI+颜色矩阵变换效果的代码贴在下面:
procedure ImageSetColorMatrix(var Dest: TImageData;
  const Source: TImageData; Matrix: TColorMatrix); overload;
asm
    push      ebp
    push      esi
    push      edi
    push      ebx
    // ebp为16字节对齐的128位栈内存地址
    sub       esp, 32
    mov       ebp, esp
    add       ebp, 16
    and       ebp, -16

    // 检查颜色矩阵除主对角线和虚拟列外的数据项,如不等于零,执行全部颜色变换
    mov       edi, ecx
    mov       esi, 4          // for (i = 4; i >= 0; i --)
@@iLoop:                      // {
    mov       ecx, 3          //   for (j = 3; j >= 0; j --)
@@jLoop:                      //   {
    cmp       ecx, esi        //     if (i == j) continue
    je        @@1
    lea       ebx, [esi+esi*4]
    add       ebx, ecx        //     index = i * 5 + j
    cmp       dword ptr[edi+ebx*4], 0
    jne       @@Transform     //     if (Matrix[Index]) goto @@Transform
@@1:
    dec       ecx
    jns       @@jLoop         //   }
    dec       esi
    jns       @@iLoop         // }

    // 处理颜色缩放
    mov       ebx, [edi+(2*5+2)*4]
    mov       ecx, [edi+(1*5+1)*4]
    mov       [ebp], ebx
    mov       [ebp+4], ecx
    mov       ebx, [edi+(0*5+0)*4]
    mov       ecx, [edi+(3*5+3)*4]
    mov       [ebp+8], ebx
    mov       [ebp+12], ecx
    movaps    xmm1, [ebp]     // xmm1 = m44 m11 m22 m33
    pxor      xmm7, xmm7
    call      _SetCopyRegs
@@yLoop_Scale:
    push      ecx
@@xLoop_Scale:
    movd      xmm0, [esi]
    punpcklbw xmm0, xmm7
    punpcklwd xmm0, xmm7
    cvtdq2ps  xmm0, xmm0
    mulps     xmm0, xmm1      // xmm0 = [A R G B] * [m44 m11 m22 m33]
    cvtps2dq  xmm0, xmm0
    packssdw  xmm0, xmm7
    packuswb  xmm0, xmm7
    movd      [edi], xmm0
    add       esi, 4
    add       edi, 4
    loop      @@xLoop_Scale
    pop       ecx
    add       esi, eax
    add       edi, ebx
    dec       edx
    jnz       @@yLoop_Scale
    jmp       @@Exit

    // 处理全部的颜色变换
@@Transform:
    // 颜色矩阵按行分别装入sse寄存器,不包括虚拟位列
    movups    xmm1, [edi+0*5*4]
    movups    xmm2, [edi+1*5*4]
    movups    xmm3, [edi+2*5*4]
    movups    xmm4, [edi+3*5*4]
    movups    xmm5, [edi+4*5*4]
    // 平移行乘上255
    mov       ebx, 255
    cvtsi2ss  xmm6, ebx
    pshufd    xmm6, xmm6, 0
    mulps     xmm5, xmm6
    // 交换每行的红与蓝位置
    pshufd    xmm1, xmm1, 11000110b
    pshufd    xmm2, xmm2, 11000110b
    pshufd    xmm3, xmm3, 11000110b
    pshufd    xmm4, xmm4, 11000110b
    pshufd    xmm5, xmm5, 11000110b
    // 平移行保存在栈中
    movaps    [ebp], xmm5
    pxor      xmm7, xmm7
    call      _SetCopyRegs
@@yLoop:
    push      ecx
@@xLoop:
    movd      xmm0, [esi]
    punpcklbw xmm0, xmm7
    punpcklwd xmm0, xmm7
    cvtdq2ps  xmm0, xmm0
    pshufd    xmm5, xmm0, 0
    pshufd    xmm6, xmm0, 01010101b
    mulps     xmm5, xmm3      // vb = blue * m3
    mulps     xmm6, xmm2      // vg = green * m2
    addps     xmm5, [ebp]     // vb += m5
    addps     xmm5, xmm6      // vb += vg
    pshufd    xmm6, xmm0, 10101010b
    pshufd    xmm0, xmm0, 11111111b
    mulps     xmm6, xmm1      // vr = red * m1
    mulps     xmm0, xmm4      // va = alpha * m4
    addps     xmm0, xmm6      // v = va + vr
    addps     xmm0, xmm5      // v += vb
    cvtps2dq  xmm0, xmm0
    packssdw  xmm0, xmm7
    packuswb  xmm0, xmm7
    movd      [edi], xmm0
    add       esi, 4
    add       edi, 4
    loop      @@xLoop
    pop       ecx
    add       esi, eax
    add       edi, ebx
    dec       edx
    jnz       @@yLoop
@@Exit:
    add       esp, 32
    pop       ebx
    pop       edi
    pop       esi
    pop       ebp
end;

procedure ImageSetColorMatrix(var Data: TImageData; Matrix: TColorMatrix); overload;
begin
  ImageSetColorMatrix(Data, Data, Matrix);
end;
//---------------------------------------------------------------------------

    《Delphi图像处理》系列使用GDI+单元下载地址和说明见文章《 GDI+ for VCL基础 -- GDI+ 与 VCL 》。

    因水平有限,错误在所难免,欢迎指正和指导。邮箱地址:[email protected]

    这里可访问《Delphi图像处理 -- 文章索引》。

 

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