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{
fpGFX - Free Pascal Graphics Library
Copyright (C) 2000 - 2001 by
Areca Systems GmbH / Sebastian Guenther, sg@freepascal.org
Copyright (C) 2006 by Graeme Geldenhuys
member of the fpGFX development team.
Image conversion helpers
See the file COPYING.modifiedLGPL, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit GELImage;
{$IFDEF Debug}
{$ASSERTIONS On}
{$ENDIF}
{$mode objfpc}{$H+}
interface
uses
Classes,
GfxBase; // fpGFX units
procedure ConvertImage(
ASourceRect: TRect; ASourceFormat: TGfxPixelFormat; ASourcePal: TGfxPalette;
ASourceData: Pointer; ASourceStride: LongWord;
ADestX, ADestY: Integer; ADestFormat: TGfxPixelFormat;
ADestData: Pointer; ADestStride: LongWord);
procedure FlipMonoImageBits(
ASourceRect: TRect; ASourceData: Pointer; ASourceStride: LongWord;
ADestX, ADestY: Integer; ADestData: Pointer; ADestStride: LongWord);
implementation
type
TConvertParams = record
RedShiftR, RedShiftL,
GreenShiftR, GreenShiftL,
BlueShiftR, BlueShiftL: Byte;
RedMask, GreenMask, BlueMask: LongWord;
RedMult, GreenMult, BlueMult: Word;
Palette: array[0..255] of LongWord;
end;
TConvertToInternalProc = procedure(Params: TConvertParams; Data: Pointer;
StartX, EndX: Integer; Dest: Pointer);
TConvertFromInternalProc = procedure(Params: TConvertParams; Data: Pointer;
Dest: Pointer; Width: Integer);
procedure ConvertMonoToInternal(Params: TConvertParams; Data: Pointer;
StartX, EndX: Integer; Dest: Pointer);
var
b: Byte;
Mask: Byte;
begin
Inc(Data, StartX shr 3);
Mask := 1 shl (7 - StartX and 7);
while StartX < EndX do
begin
PLongWord(Dest)^ := Params.Palette[Ord((PByte(Data)^ and Mask) <> 0)];
if Mask = 1 then
begin
Inc(Data);
Mask := 128;
end else
Mask := Mask shr 1;
Inc(StartX);
Inc(Dest, 4);
end;
end;
procedure ConvertPal4ToInternal(Params: TConvertParams; Data: Pointer;
StartX, EndX: Integer; Dest: Pointer);
var
b: Byte;
begin
// !!!: Just works for even StartX and EndX values
ASSERT((StartX and 1) = 0);
ASSERT((EndX and 1) = 0);
Inc(Data, StartX shr 1);
while StartX < EndX do
begin
b := PByte(Data)^;
PLongWord(Dest)[0] := Params.Palette[b shr 4];
PLongWord(Dest)[1] := Params.Palette[b and 15];
Inc(StartX, 2);
Inc(Data);
Inc(Dest, 8);
end;
end;
procedure ConvertPal8ToInternal(Params: TConvertParams; Data: Pointer;
StartX, EndX: Integer; Dest: Pointer);
begin
Inc(Data, StartX);
while StartX < EndX do
begin
PLongWord(Dest)^ := Params.Palette[PByte(Data)^];
Inc(StartX);
Inc(Data);
Inc(Dest, 4);
end;
end;
procedure ConvertRGB24ToInternal(Params: TConvertParams; Data: Pointer;
StartX, EndX: Integer; Dest: Pointer);
var
PixelIn: LongWord;
begin
Inc(Data, StartX * 3);
while StartX < EndX do
begin
PixelIn := 0;
Move(Data^, PixelIn, 3);
PLongWord(Dest)^ :=
(((PixelIn shr Params.RedShiftR) and $ff) shl Params.RedShiftL) or
(((PixelIn shr Params.GreenShiftR) and $ff) shl Params.GreenShiftL) or
(((PixelIn shr Params.BlueShiftR) and $ff) shl Params.BlueShiftL);
Inc(StartX);
Inc(Data, 3);
Inc(Dest, 4);
end;
end;
procedure ConvertRGB32ToInternal(Params: TConvertParams; Data: Pointer;
StartX, EndX: Integer; Dest: Pointer);
var
PixelIn: LongWord;
begin
Inc(Data, StartX * 4);
while StartX < EndX do
begin
PixelIn := PLongWord(Data)^;
PLongWord(Dest)^ :=
(((PixelIn shr Params.RedShiftR) and $ff) shl Params.RedShiftL) or
(((PixelIn shr Params.GreenShiftR) and $ff) shl Params.GreenShiftL) or
(((PixelIn shr Params.BlueShiftR) and $ff) shl Params.BlueShiftL);
Inc(StartX);
Inc(Data, 4);
Inc(Dest, 4);
end;
end;
procedure ConvertInternalToRGB16(Params: TConvertParams; Data: Pointer;
Dest: Pointer; Width: Integer);
var
PixelIn: LongWord;
begin
repeat
PixelIn := PLongWord(Data)^;
PWord(Dest)^ :=
(((PixelIn and $0000ff) shr Params.RedShiftR) shl Params.RedShiftL) or
(((PixelIn and $00ff00) shr Params.GreenShiftR) shl Params.GreenShiftL) or
(((PixelIn and $ff0000) shr Params.BlueShiftR) shl Params.BlueShiftL);
Inc(Data, 4);
Inc(Dest, 2);
Dec(Width);
until Width = 0;
end;
procedure ConvertInternalToRGB24(Params: TConvertParams; Data: Pointer;
Dest: Pointer; Width: Integer);
var
PixelIn, PixelOut: LongWord;
begin
repeat
PixelIn := PLongWord(Data)^;
PixelOut :=
(((PixelIn and $0000ff) shr Params.RedShiftR) shl Params.RedShiftL) or
(((PixelIn and $00ff00) shr Params.GreenShiftR) shl Params.GreenShiftL) or
(((PixelIn and $ff0000) shr Params.BlueShiftR) shl Params.BlueShiftL);
PWord(Dest)^ := Word(PixelOut);
PByte(Dest)[2] := PixelOut shr 16;
Inc(Data, 4);
Inc(Dest, 3);
Dec(Width);
until Width = 0;
end;
procedure ConvertInternalToRGB32(Params: TConvertParams; Data: Pointer;
Dest: Pointer; Width: Integer);
var
PixelIn: LongWord;
begin
repeat
PixelIn := PLongWord(Data)^;
PLongWord(Dest)^ :=
(((PixelIn and $0000ff) shr Params.RedShiftR) shl Params.RedShiftL) or
(((PixelIn and $00ff00) shr Params.GreenShiftR) shl Params.GreenShiftL) or
(((PixelIn and $ff0000) shr Params.BlueShiftR) shl Params.BlueShiftL);
Inc(Data, 4);
Inc(Dest, 4);
Dec(Width);
until Width = 0;
end;
function GetBitShiftAndCount(Mask: LongWord; var Shift: Byte): Integer;
begin
Shift := 0;
while (Mask and 1) = 0 do
begin
Mask := Mask shr 1;
Inc(Shift);
end;
Result := 0;
while Mask > 0 do
begin
Mask := Mask shr 1;
Inc(Result);
end;
end;
procedure SetupShifts(PixelFormat: TGfxPixelFormat; var Params: TConvertParams);
begin
Params.RedShiftR := 8 -
GetBitShiftAndCount(PixelFormat.RedMask, Params.RedShiftL);
Params.GreenShiftR := 16 -
GetBitShiftAndCount(PixelFormat.GreenMask, Params.GreenShiftL);
Params.BlueShiftR := 24 -
GetBitShiftAndCount(PixelFormat.BlueMask, Params.BlueShiftL);
end;
procedure ConvertImage(
ASourceRect: TRect; ASourceFormat: TGfxPixelFormat; ASourcePal: TGfxPalette;
ASourceData: Pointer; ASourceStride: LongWord;
ADestX, ADestY: Integer; ADestFormat: TGfxPixelFormat;
ADestData: Pointer; ADestStride: LongWord);
// returns the highest processed index
function ConvertPalette(MaxIndex: Integer;
var Params: TConvertParams): Integer;
var
i: Integer;
begin
if Assigned(ASourcePal) then
begin
Result := ASourcePal.EntryCount - 1;
if Result > 255 then
Result := 255;
for i := 0 to Result do
with ASourcePal.Entries[i] do
Params.Palette[i] :=
(Red div 257) or
((Green div 257) shl 8) or
((Blue div 257) shl 16);
end else
Result := -1;
end;
var
ParamsS2I, ParamsI2D: TConvertParams; // Source to internal, internal to dest
ConvertToInternal: TConvertToInternalProc;
ConvertFromInternal: TConvertFromInternalProc;
Scanline: Pointer;
i, max, w, y: Integer;
begin
case ASourceFormat.FormatType of
ftMono:
begin
ConvertToInternal := @ConvertMonoToInternal;
max := ConvertPalette(1, ParamsS2I);
if max < 1 then
begin
ParamsS2I.Palette[1] := $ffffff;
if max < 0 then
ParamsS2I.Palette[0] := 0;
end;
end;
ftPal4, ftPal4A:
begin
ConvertToInternal := @ConvertPal4ToInternal;
max := ConvertPalette(15, ParamsS2I);
for i := max + 1 to 15 do
ParamsS2I.Palette[i] := 0;
end;
ftPal8, ftPal8A:
begin
ConvertToInternal := @ConvertPal8ToInternal;
max := ConvertPalette(255, ParamsS2I);
for i := max + 1 to 255 do
ParamsS2I.Palette[i] := i or (i shl 8) or (i shl 16);
end;
ftRGB24:
begin
ConvertToInternal := @ConvertRGB24ToInternal;
ParamsS2I.RedShiftR := 8 -
GetBitShiftAndCount(ASourceFormat.RedMask, ParamsS2I.RedShiftL);
ParamsS2I.GreenShiftR := 16 -
GetBitShiftAndCount(ASourceFormat.GreenMask, ParamsS2I.GreenShiftL);
ParamsS2I.BlueShiftR := 24 -
GetBitShiftAndCount(ASourceFormat.BlueMask, ParamsS2I.BlueShiftL);
end;
ftRGB32:
begin
ConvertToInternal := @ConvertRGB32ToInternal;
ParamsS2I.RedShiftR := 8 -
GetBitShiftAndCount(ASourceFormat.RedMask, ParamsS2I.RedShiftL);
ParamsS2I.GreenShiftR := 16 -
GetBitShiftAndCount(ASourceFormat.GreenMask, ParamsS2I.GreenShiftL);
ParamsS2I.BlueShiftR := 24 -
GetBitShiftAndCount(ASourceFormat.BlueMask, ParamsS2I.BlueShiftL);
end;
else
raise EGfxUnsupportedPixelFormat.Create(ASourceFormat);
end;
case ADestFormat.FormatType of
ftRGB16:
begin
ConvertFromInternal := @ConvertInternalToRGB16;
SetupShifts(ADestFormat, ParamsI2D);
end;
ftRGB24:
begin
ConvertFromInternal := @ConvertInternalToRGB24;
SetupShifts(ADestFormat, ParamsI2D);
end;
ftRGB32:
begin
ConvertFromInternal := @ConvertInternalToRGB32;
SetupShifts(ADestFormat, ParamsI2D);
end;
else
raise EGfxUnsupportedPixelFormat.Create(ASourceFormat);
end;
w := ASourceRect.Right - ASourceRect.Left;
GetMem(Scanline, w * SizeOf(TGfxPixel));
for y := ASourceRect.Top to ASourceRect.Bottom - 1 do
begin
ConvertToInternal(ParamsS2I, ASourceData,
ASourceRect.Left, ASourceRect.Right, Scanline);
Inc(ASourceData, ASourceStride);
ConvertFromInternal(ParamsI2D, Scanline, ADestData, w);
Inc(ADestData, ADestStride);
end;
FreeMem(Scanline);
end;
procedure FlipMonoImageBits(
ASourceRect: TRect; ASourceData: Pointer; ASourceStride: LongWord;
ADestX, ADestY: Integer; ADestData: Pointer; ADestStride: LongWord);
const
BitFlipTable: array[Byte] of Byte = (
$00, $80, $40, $C0, $20, $A0, $60, $E0, $10, $90, $50, $D0, $30, $B0, $70, $F0,
$08, $88, $48, $C8, $28, $A8, $68, $E8, $18, $98, $58, $D8, $38, $B8, $78, $F8,
$04, $84, $44, $C4, $24, $A4, $64, $E4, $14, $94, $54, $D4, $34, $B4, $74, $F4,
$0C, $8C, $4C, $CC, $2C, $AC, $6C, $EC, $1C, $9C, $5C, $DC, $3C, $BC, $7C, $FC,
$02, $82, $42, $C2, $22, $A2, $62, $E2, $12, $92, $52, $D2, $32, $B2, $72, $F2,
$0A, $8A, $4A, $CA, $2A, $AA, $6A, $EA, $1A, $9A, $5A, $DA, $3A, $BA, $7A, $FA,
$06, $86, $46, $C6, $26, $A6, $66, $E6, $16, $96, $56, $D6, $36, $B6, $76, $F6,
$0E, $8E, $4E, $CE, $2E, $AE, $6E, $EE, $1E, $9E, $5E, $DE, $3E, $BE, $7E, $FE,
$01, $81, $41, $C1, $21, $A1, $61, $E1, $11, $91, $51, $D1, $31, $B1, $71, $F1,
$09, $89, $49, $C9, $29, $A9, $69, $E9, $19, $99, $59, $D9, $39, $B9, $79, $F9,
$05, $85, $45, $C5, $25, $A5, $65, $E5, $15, $95, $55, $D5, $35, $B5, $75, $F5,
$0D, $8D, $4D, $CD, $2D, $AD, $6D, $ED, $1D, $9D, $5D, $DD, $3D, $BD, $7D, $FD,
$03, $83, $43, $C3, $23, $A3, $63, $E3, $13, $93, $53, $D3, $33, $B3, $73, $F3,
$0B, $8B, $4B, $CB, $2B, $AB, $6B, $EB, $1B, $9B, $5B, $DB, $3B, $BB, $7B, $FB,
$07, $87, $47, $C7, $27, $A7, $67, $E7, $17, $97, $57, $D7, $37, $B7, $77, $F7,
$0F, $8F, $4F, $CF, $2F, $AF, $6F, $EF, $1F, $9F, $5F, $DF, $3F, $BF, $7F, $FF);
var
StartByte, EndByte, x, y: Integer;
begin
StartByte := ASourceRect.Left shr 3;
EndByte := (ASourceRect.Right + 7) shr 3;
Inc(ASourceData, StartByte);
Dec(EndByte, StartByte);
for y := ASourceRect.Top to ASourceRect.Bottom - 1 do
begin
for x := 0 to EndByte do
PByte(ADestData)[x] := BitFlipTable[PByte(ASourceData)[x]];
Inc(ASourceData, ASourceStride);
Inc(ADestData, ADestStride);
end;
end;
end.
|