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{}
procedure CalcRect(var src,dst:TRECT;mode:dword);
var
dh, dw:integer;
begin
if (Mode and frbkStretch)=frbkStretch then
begin
if (Mode and frbkProportional)<>0 then
begin
if (dst.right*src.bottom)>(src.right*dst.bottom) then
begin
dh:=dst.bottom;
dw:=dh*src.right div src.bottom
end
else
begin
dw:=dst.right;
dh:=dw*src.bottom div src.right;
end;
end
else
begin
dw:=dst.right;
dh:=dst.bottom;
end;
end
else if (Mode and frbkStretchX)<>0 then
begin
dw:=dst.right;
if (Mode and frbkProportional)<>0 then
dh:=dw*src.bottom div src.right
else
dh:=src.bottom;
end
else if (Mode and frbkStretchY)<>0 then
begin
dh:=dst.bottom;
if (Mode and frbkProportional)<>0 then
dw:=dh*src.right div src.bottom
else
dw:=src.right;
end
else
begin
dw:=src.right;
dh:=src.bottom;
end;
if (Mode and frbkBottom)<>0 then
begin
if dh<=dst.bottom then
begin
dst.top:=(dst.bottom-dh);
end
else
begin
src.top:=(dh-dst.bottom);
dh:=dst.bottom;
src.bottom:=src.top+dh;
end;
end;
if (Mode and frbkRight)<>0 then
begin
if dw<=dst.right then
begin
dst.left:=(dst.right-dw);
end
else
begin
src.left:=(dw-dst.right);
dw:=dst.right;
src.right:=src.left+dw;
end;
end;
if (Mode and frbkCenterX)<>0 then
begin
if dw<=dst.right then
begin
dst.left:=(dst.right-dw) div 2;
end
else
begin
src.left:=(dw-dst.right) div 2;
dw:=dst.right;
src.right:=src.left+dw;
end;
end;
if (Mode and frbkCenterY)<>0 then
begin
if dh<=dst.bottom then
begin
dst.top:=(dst.bottom-dh) div 2;
end
else
begin
src.top:=(dh-dst.bottom) div 2;
dh:=dst.bottom;
src.bottom:=src.top+dh;
end;
end;
dst.right:=dst.left+dw;
dst.bottom:=dst.top+dh;
end;
function CreateDIB32(dc:HDC;w,h:integer):HBITMAP;
var
pt:pointer;
bi:TBITMAPINFO;
begin
FillChar(bi,SizeOf(TBITMAPINFO),0);
bi.bmiHeader.biSize :=SizeOf(TBITMAPINFOHEADER);
bi.bmiHeader.biWidth :=w;
bi.bmiHeader.biHeight :=h;
bi.bmiHeader.biPlanes :=1;
bi.bmiHeader.biBitCount:=32;
result:=CreateDIBSection(dc,bi,DIB_RGB_COLORS,pt,0,0);
end;
procedure PreMultiplyChanells(hbmp:HBITMAP);
type
tPixel=array [0..3] of Byte;
var
bmp:windows.TBITMAP;
flag:bool;
pBitmapBits:PByte;
Len:dword;
bh,bw,y,x,z:integer;
pPixel:^tPixel;
alpha:dword;
//f:THANDLE;
begin
GetObject(hbmp,SizeOf(bmp),@bmp);
bh:=bmp.bmHeight;
bw:=bmp.bmWidth;
z:=bw*4;
Len:=bh*z;
mGetMem(pBitmapBits,Len);
GetBitmapBits(hbmp,Len,pBitmapBits);
flag:=true;
for y:=0 to bh-1 do
begin
pointer(pPixel):=PAnsiChar(pBitmapBits)+z*y;
for x:=0 to bw-1 do
begin
if pPixel^[3]<>0 then
flag:=false
else
pPixel^[3]:=255;
inc(pByte(pPixel),4);
end
end;
if not flag then
begin
GetBitmapBits(hbmp,Len,pBitmapBits); // alpha not changed
for y:=0 to bh-1 do
begin
pointer(pPixel):=PAnsiChar(pBitmapBits)+z*y;
for x:=0 to bw-1 do
begin
alpha:=pPixel^[3];
if alpha<255 then
begin
pPixel^[0]:=dword(pPixel^[0])*alpha div 255;
pPixel^[1]:=dword(pPixel^[1])*alpha div 255;
pPixel^[2]:=dword(pPixel^[2])*alpha div 255;
end;
inc(pByte(pPixel),4);
end
end;
end;
SetBitmapBits(hbmp,Len,pBitmapBits);
mFreeMem(pBitmapBits);
end;
function FixBitmap(dc:HDC;var hBmp:HBITMAP):HBITMAP;
var
dc24,dc32:HDC;
hBitmap32,obmp24,obmp32:HBITMAP;
bmpInfo:windows.TBITMAP;
begin
GetObject(hBmp,SizeOf(bmpInfo),@bmpInfo);
if bmpInfo.bmBitsPixel<>32 then
begin
dc32:=CreateCompatibleDC(dc);
dc24:=CreateCompatibleDC(dc);
hBitmap32:=CreateDIB32(dc,bmpInfo.bmWidth,bmpInfo.bmHeight);
obmp24:=SelectObject(dc24,hBmp);
obmp32:=SelectObject(dc32,hBitmap32);
BitBlt(dc32,0,0,bmpInfo.bmWidth,bmpInfo.bmHeight,dc24,0,0,SRCCOPY);
DeleteObject(SelectObject(dc24,obmp24));
SelectObject(dc32,obmp32);
DeleteDC(dc24);
DeleteDC(dc32);
hBmp:=hBitmap32;
end;
PreMultiplyChanells(hBmp);
result:=hBmp;
end;
procedure TWATFrame.PreparePicture(dc:HDC;rc:TRECT);
var
bmpinfo:windows.TBITMAP;
src,dst:TRECT;
x,y,w,h,dh:integer;
br:HBRUSH;
hdcbmp:HDC;
bf:BLENDFUNCTION;
hOld:THANDLE;
D:PWATFrameData;
begin
D:=CustomData;
D.BkDC:=CreateCompatibleDC(dc);
FixBitmap(dc,D.BkBitmap);
DeleteObject(SelectObject(D.BkDC,CreateDIB32(dc,rc.right-rc.left,rc.bottom-rc.top)));
//fill empty space by BK color
br:=CreateSolidBrush(D.BkColor);
FillRect(D.BkDC,rc,br);
DeleteObject(br);
CopyRect(dst,rc);
hdcbmp:=CreateCompatibleDC(D.BkDC);
GetObject(D.BkBitmap,SizeOf(bmpinfo),@bmpinfo);
hOld:=SelectObject(hdcbmp,D.BkBitmap);
SetRect(src,0,0,bmpinfo.bmWidth,bmpinfo.bmHeight);
if (D.padding.top+D.padding.bottom)<(dst.bottom-dst.top) then
dec(dst.bottom,D.padding.top+D.padding.bottom);
if (D.padding.left+D.padding.right)<(dst.right-dst.left) then
dec(dst.right,D.padding.left+D.padding.right);
CalcRect(src,dst,D.BkMode); // calculate final picture rect
w:=1;
if (D.BkMode and frbkTileX)<>0 then
begin
x:=dst.right;
while x<rc.right do
begin
inc(w);
inc(x,dst.right);
end;
end;
h:=1;
if (D.BkMode and frbkTileY)<>0 then
begin
y:=dst.bottom;
while y<rc.bottom do
begin
inc(h);
inc(y,dst.bottom);
end;
end;
bf.BlendOp :=AC_SRC_OVER;
bf.BlendFlags :=0;
bf.SourceConstantAlpha:=255;
bf.AlphaFormat :=1; // AC_SRC_ALPHA introduced in delphi 7
x:=dst.left+D.padding.left;
if x<dst.right then
while w>0 do
begin
dh:=h;
y:=dst.top+D.padding.top;
if y<dst.bottom then
while dh>0 do
begin
Windows.AlphaBlend(D.BkDC,x,y,dst.right-dst.left,dst.bottom-dst.top,
hdcbmp,src.left,src.top,src.right-src.left,src.bottom-src.top,bf);
inc(y,dst.bottom);
dec(dh);
end;
inc(x,dst.right);
dec(w);
end;
SelectObject(hdcbmp,hOld);
DeleteDC(hdcbmp);
end;
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