Mega Code Archive
Bitmap flip rotate mirror
<![CDATA[
{ ... }
type
TPixel8 = Byte;
TPixel16 = Word;
TPixel24 = packed record
Blue: Byte;
Green: Byte;
Red: Byte;
end;
TPixel32 = LongWord;
function GetBitmapPixelSize(const Bitmap: TBitmap): Integer;
begin
case Bitmap.PixelFormat of
pf8Bit:
Result := 1;
pf16Bit:
Result := 2;
pf24Bit:
Result := 3;
pf32Bit:
Result := 4;
else
Result := 0;
end;
end;
function GetBitmapScanlineSize(const Bitmap: TBitmap): Integer;
var
SL0: Pointer;
SL1: Pointer;
begin
if (Bitmap.Height > 1) then
begin
SL0 := Bitmap.Scanline[0];
SL1 := Bitmap.Scanline[1];
Result := LongInt(SL1) - LongInt(SL0);
end
else
Result := 0;
end;
procedure FlipBitmap_8(const Bitmap: TBitmap);
type
TPixel = TPixel8; {Dependent on Bitmap.PixelFormat}
PPixel = ^TPixel;
var
Buffer: TPixel;
PPixel1: PPixel;
PPixel2: PPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
for I := 1 to (Bitmap.Height div 2) do {Ignore middle row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Inc(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
end;
procedure FlipBitmap_16(const Bitmap: TBitmap);
type
TPixel = TPixel16; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
Buffer: TPixel;
PPixel1: PPixel;
PPixel2: PPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
for I := 1 to (Bitmap.Height div 2) do {Ignore middle row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Inc(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
end;
procedure FlipBitmap_24(const Bitmap: TBitmap);
type
TPixel = TPixel24; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
Buffer: TPixel;
PPixel1: PPixel;
PPixel2: PPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
for I := 1 to (Bitmap.Height div 2) do {Ignore middle row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Inc(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
end;
procedure FlipBitmap_32(const Bitmap: TBitmap);
type
TPixel = TPixel32; {Dependent on PixelFormat.}
PPixel = ^TPixel;
var
Buffer: TPixel;
PPixel1: PPixel;
PPixel2: PPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
for I := 1 to (Bitmap.Height div 2) do {Ignore middle row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Inc(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
end;
procedure MirrorBitmap_8(const Bitmap: TBitmap);
type
TPixel = TPixel8; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := PPixel1Start;
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to Bitmap.Height do
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore middle column}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Inc(LongInt(PPixel2Start), RowSize);
end;
end;
procedure MirrorBitmap_16(const Bitmap: TBitmap);
type
TPixel = TPixel16; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := PPixel1Start;
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to Bitmap.Height do
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore middle column}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Inc(LongInt(PPixel2Start), RowSize);
end;
end;
procedure MirrorBitmap_24(const Bitmap: TBitmap);
type
TPixel = TPixel24; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := PPixel1Start;
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to Bitmap.Height do
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore middle column}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Inc(LongInt(PPixel2Start), RowSize);
end;
end;
procedure MirrorBitmap_32(const Bitmap: TBitmap);
type
TPixel = TPixel32; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := PPixel1Start;
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to Bitmap.Height do
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore middle column}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Inc(LongInt(PPixel2Start), RowSize);
end;
end;
procedure RotateBitmap180_8(const Bitmap: TBitmap);
type
TPixel = TPixel8; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to (Bitmap.Height div 2) do {Ignore center row for now}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
if (Odd(Bitmap.Height)) then {Process center row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore center pixel}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
end;
end;
procedure RotateBitmap180_16(const Bitmap: TBitmap);
type
TPixel = TPixel16; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to (Bitmap.Height div 2) do {Ignore center row for now}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
if (Odd(Bitmap.Height)) then {Process center row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore center pixel}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
end;
end;
procedure RotateBitmap180_24(const Bitmap: TBitmap);
type
TPixel = TPixel24; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to (Bitmap.Height div 2) do {Ignore center row for now}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
if (Odd(Bitmap.Height)) then {Process center row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore center pixel}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
end;
end;
procedure RotateBitmap180_32(const Bitmap: TBitmap);
type
TPixel = TPixel32; {Dependent on PixelFormat}
PPixel = ^TPixel;
var
PPixel1: PPixel;
PPixel2: PPixel;
Buffer: TPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
RowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
RowSize := GetBitmapScanlineSize(Bitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := Bitmap.Scanline[Bitmap.Height - 1];
Inc(PPixel2Start, Bitmap.Width - 1);
for I := 1 to (Bitmap.Height div 2) do {Ignore center row for now}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to Bitmap.Width do
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
Inc(LongInt(PPixel1Start), RowSize);
Dec(LongInt(PPixel2Start), RowSize);
end;
if (Odd(Bitmap.Height)) then {Process center row}
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 1 to (Bitmap.Width div 2) do {Ignore center pixel}
begin
Buffer := PPixel1^;
PPixel1^ := PPixel2^;
PPixel2^ := Buffer;
Inc(PPixel1);
Dec(PPixel2);
end;
end;
end;
procedure RotateBitmapCW_32(const Bitmap: TBitmap);
type
TPixel = TPixel32; {Dependent on Bitmap.PixelFormat}
PPixel = ^TPixel;
var
NewBitmap: TBitmap;
PPixel1: PPixel;
PPixel2: PPixel;
PPixel1Start: PPixel;
PPixel2Start: PPixel;
I: Integer;
J: Integer;
BitmapRowSize: Integer;
NewBitmapRowSize: Integer;
begin
Assert(GetBitmapPixelSize(Bitmap) = SizeOf(TPixel));
Assert(Bitmap.Height > 0);
Assert(Bitmap.Width > 0);
NewBitmap := TBitmap.Create;
try
NewBitmap.PixelFormat := Bitmap.PixelFormat;
NewBitmap.Height := Bitmap.Width;
NewBitmap.Width := Bitmap.Height;
BitmapRowSize := GetBitmapScanlineSize(Bitmap);
NewBitmapRowSize := GetBitmapScanlineSize(NewBitmap);
PPixel1Start := Bitmap.Scanline[0];
PPixel2Start := NewBitmap.Scanline[0];
Inc(PPixel2Start, NewBitmap.Width - 1);
for I := 0 to (Bitmap.Height - 1) do
begin
PPixel1 := PPixel1Start;
PPixel2 := PPixel2Start;
for J := 0 to (Bitmap.Width - 1) do
begin
PPixel2^ := PPixel1^;
Inc(PPixel1);
Inc(Integer(PPixel2), NewBitmapRowSize);
end;
Inc(Integer(PPixel1Start), BitmapRowSize);
Dec(PPixel2Start);
end;
Bitmap.Assign(NewBitmap);
finally
NewBitmap.Free;
end;
end;
procedure FlipBitmap(const Bitmap: TBitmap);
begin
case Bitmap.PixelFormat of
pf8Bit:
FlipBitmap_8(Bitmap);
pf16Bit:
FlipBitmap_16(Bitmap);
pf24Bit:
FlipBitmap_24(Bitmap);
pf32Bit:
FlipBitmap_32(Bitmap);
else
Assert(False);
end;
end;
procedure MirrorBitmap(const Bitmap: TBitmap);
begin
case Bitmap.PixelFormat of
pf8Bit:
MirrorBitmap_8(Bitmap);
pf16Bit:
MirrorBitmap_16(Bitmap);
pf24Bit:
MirrorBitmap_24(Bitmap);
pf32Bit:
MirrorBitmap_32(Bitmap);
else
Assert(False);
end;
end;
procedure RotateBitmap180(const Bitmap: TBitmap);
begin
case Bitmap.PixelFormat of
pf8Bit:
RotateBitmap180_8(Bitmap);
pf16Bit:
RotateBitmap180_16(Bitmap);
pf24Bit:
RotateBitmap180_24(Bitmap);
pf32Bit:
RotateBitmap180_32(Bitmap);
else
Assert(False);
end;
end;
procedure RotateBitmapCW(const Bitmap: TBitmap);
begin
case Bitmap.PixelFormat of
pf8Bit:
;
pf16Bit:
;
pf24Bit:
;
pf32Bit:
RotateBitmapCW_32(Bitmap);
else
Assert(False);
end;
end;
procedure RotateBitmapCCW(const Bitmap: TBitmap);
begin
case Bitmap.PixelFormat of
pf8Bit:
;
pf16Bit:
;
pf24Bit:
;
pf32Bit:
;
else
Assert(False);
end;
end;
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