Desculpe não estar citando a fonte, não pude localizar, recebi por e-mail há
muitos anos.
Abs,
José Chão
How to mirror and rotate bitmaps
Answer:
{Turn off Range Checking because of ARRAY[0..0] construct below}
{$R-}
unit Bitmap;
interface
uses
Windows, Graphics;
procedure MirrorHorizontal(Bitmap: TBitmap);
procedure MirrorVertical(Bitmap: TBitmap);
procedure Rotate90Degrees(Bitmap: TBitmap);
procedure Rotate270Degrees(Bitmap: TBitmap);
procedure Rotate180Degrees(Bitmap: TBitmap);
implementation
uses
dialogs, Classes, SysUtils;
type
EBitmapError = class(Exception);
TRGBArray = array[0..0] of TRGBTriple;
pRGBArray = ^TRGBArray;
procedure MirrorHorizontal(Bitmap: TBitmap);
var
i, j, w: Integer;
RowIn: pRGBArray;
RowOut: pRGBArray;
begin
w := bitmap.width * sizeof(TRGBTriple);
GetMem(rowin, w);
for j := 0 to Bitmap.Height - 1 do
begin
move(Bitmap.Scanline[j]^, rowin^, w);
rowout := Bitmap.Scanline[j];
for i := 0 to Bitmap.Width - 1 do
rowout[i] := rowin[Bitmap.Width - 1 - i];
end;
bitmap.Assign(bitmap);
FreeMem(rowin);
end;
procedure MirrorVertical(Bitmap: TBitmap);
var
j, w: Integer;
help: TBitmap;
begin
help := TBitmap.Create;
help.Width := Bitmap.Width;
help.Height := Bitmap.Height;
help.PixelFormat := Bitmap.PixelFormat;
w := Bitmap.Width * sizeof(TRGBTriple);
for j := 0 to Bitmap.Height - 1 do
move(Bitmap.Scanline[j]^, Help.Scanline[Bitmap.Height - 1 - j]^, w);
Bitmap.Assign(help);
help.free;
end;
type
THelpRGB = packed record
rgb: TRGBTriple;
dummy: byte;
end;
procedure Rotate270Degrees(Bitmap: TBitmap);
var
aStream: TMemorystream;
header: TBITMAPINFO;
dc: hDC;
P: ^THelpRGB;
x, y, b, h: Integer;
RowOut: pRGBArray;
begin
aStream := TMemoryStream.Create;
aStream.SetSize(Bitmap.Height * Bitmap.Width * 4);
with header.bmiHeader do
begin
biSize := SizeOf(TBITMAPINFOHEADER);
biWidth := Bitmap.Width;
biHeight := Bitmap.Height;
biPlanes := 1;
biBitCount := 32;
biCompression := 0;
biSizeimage := aStream.Size;
biXPelsPerMeter := 1;
biYPelsPerMeter := 1;
biClrUsed := 0;
biClrImportant := 0;
end;
dc := GetDC(0);
P := aStream.Memory;
GetDIBits(dc, Bitmap.Handle, 0, Bitmap.Height, P, header, dib_RGB_Colors);
ReleaseDC(0, dc);
b := bitmap.Height; {rotate}
h := bitmap.Width; {rotate}
bitmap.Width := b;
bitmap.height := h;
for y := 0 to (h - 1) do
begin
rowOut := Bitmap.ScanLine[(h - 1) - y];
P := aStream.Memory; {reset pointer}
inc(p, y);
for x := (b - 1) downto 0 do
begin
rowout[x] := p^.rgb;
inc(p, h);
end;
end;
aStream.Free;
end;
procedure Rotate90Degrees(Bitmap: TBitmap);
var
aStream: TMemorystream;
header: TBITMAPINFO;
dc: hDC;
P: ^THelpRGB;
x, y, b, h: Integer;
RowOut: pRGBArray;
begin
aStream := TMemoryStream.Create;
aStream.SetSize(Bitmap.Height * Bitmap.Width * 4);
with header.bmiHeader do
begin
biSize := SizeOf(TBITMAPINFOHEADER);
biWidth := Bitmap.Width;
biHeight := Bitmap.Height;
biPlanes := 1;
biBitCount := 32;
biCompression := 0;
biSizeimage := aStream.Size;
biXPelsPerMeter := 1;
biYPelsPerMeter := 1;
biClrUsed := 0;
biClrImportant := 0;
end;
dc := GetDC(0);
P := aStream.Memory;
GetDIBits(dc, Bitmap.Handle, 0, Bitmap.Height, P, header, dib_RGB_Colors);
ReleaseDC(0, dc);
b := bitmap.Height; {rotate}
h := bitmap.Width; {rotate}
bitmap.Width := b;
bitmap.height := h;
for y := 0 to (h - 1) do
begin
rowOut := Bitmap.ScanLine[y];
P := aStream.Memory; {reset pointer}
inc(p, y);
for x := 0 to (b - 1) do
begin
rowout[x] := p^.rgb;
inc(p, h);
end;
end;
aStream.Free;
end;
procedure Rotate180Degrees(Bitmap: TBitmap);
var
i, j: Integer;
rowIn: pRGBArray;
rowOut: pRGBArray;
help: TBitmap;
begin
help := TBitmap.Create;
help.Width := Bitmap.Width;
help.Height := Bitmap.Height;
help.PixelFormat := Bitmap.PixelFormat;
< {only pf24bit for now}
for j := 0 to Bitmap.Height - 1 do
begin
rowIn := Bitmap.ScanLine[j];
rowOut := help.ScanLine[Bitmap.Height - j - 1];
for i := 0 to Bitmap.Width - 1 do
rowOut[Bitmap.Width - i - 1] := rowIn[i]
end;
bitmap.assign(help);
help.free;
end;
end.
----- Mensagem original ----
De: Alessandro Magno <[EMAIL PROTECTED]>
Para: delphi-br@yahoogrupos.com.br
Enviadas: Quarta-feira, 17 de Outubro de 2007 16:15:03
Assunto: [delphi-br] Espelhar imagens
Galera,
Preciso saber se no delphi tem jeito de "Espelhar" um Timage alguém tem
alguma dica??? Até Java Script faz isso, mas já procurei na net e não
encontrei nada para Delphi.
Atenciosamente,
Alessandro Magno
[As partes desta mensagem que não continham texto foram removidas]
Abra sua conta no Yahoo! Mail, o único sem limite de espaço para
armazenamento!
http://br.mail.yahoo.com/
[As partes desta mensagem que não continham texto foram removidas]
