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GraphicColor.pas
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GraphicColor.pas
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unit GraphicColor;
// The original code is GraphicCompression.pas, released November 1, 1999.
//
// The initial developer of the original code is Mike Lischke (www.soft-gems.net),
//
// Copyright (C) 1999-2003 Mike Lischke. All Rights Reserved.
//----------------------------------------------------------------------------------------------------------------------
//
// This file is part of the image library GraphicEx.
//
// GraphicColor contains the implementation of the color conversion manager.
// This class is responsible for converting between these color schemes/formats:
// - RGB(A)
// - BGR(A)
// - CMY(K)
// - CIE L*a*b*
// - PhotoYCC, standard YCbCr
// - indexed
// - grayscale (with alpha, which is ignored currently)
//
// Additional tasks are:
// - conversions between bit depths (1, 2, 4, 8, 16 bits)
// - palette creation
// - gamma tables creation and application
// - masked pixel transfer for interlaced images
// - big endian swap
// - plane (planar) -> interleaved (interlaced) conversion
//
// Notes:
// - Throughout the entire unit I used the terms BPS and SPP for "bits per sample" and
// "samples per pixel", respectively. A sample is one component per pixel. For indexed color schemes
// there's only 1 sample per pixel, for RGB there are 3 (red, green and blue) and so on.
// - The bit depth of multi sample formats like RGB must be equal for each color component.
// - Because of the large amount of possible combinations (color schemes, sample depth, gamma, byte swap)
// I limited the accepted combinations to pratical ones. This leaves currently out:
// + gamma correction for 16 bit values
// + conversion to 16 bit (target) grayscale with alpha
// + samples sizes less than 8 bits for multi-sample schemes (RGB etc.)
// + indexed schemes with planes (e.g. 16 colors indexed as 4 planes each with one bit per sample)
// - For now there is no conversion between indexed and non-indexed formats. Also between grayscale
// and any other scheme is no conversion possible.
//
//----------------------------------------------------------------------------------------------------------------------
interface
{$Include GraphicConfiguration.inc}
{$Include Compilers.inc}
uses
Windows, Graphics, GraphicStrings;
const
// This is the value for average CRT monitors, adjust it if your monitor differs.
DefaultDisplayGamma = 2.2;
type
PCMYK = ^TCMYK;
TCMYK = packed record
C, M, Y, K: Byte;
end;
PCMYK16 = ^TCMYK16;
TCMYK16 = packed record
C, M, Y, K: Word;
end;
PCMY = ^TCMY;
TCMY = packed record
C, M, Y: Byte;
end;
PCMY16 = ^TCMY16;
TCMY16 = packed record
C, M, Y: Word;
end;
PRGB = ^TRGB;
TRGB = packed record
R, G, B: Byte;
end;
PRGB16 = ^TRGB16;
TRGB16 = packed record
R, G, B: Word;
end;
PRGB32 = ^TRGB32;
TRGB32 = packed record
R, G, B: Cardinal;
end;
PRGBFloat = ^TRGBFloat;
TRGBFloat = packed record
R, G, B: Single;
end;
PRGBA = ^TRGBA;
TRGBA = packed record
R, G, B, A: Byte;
end;
PRGBA16 = ^TRGBA16;
TRGBA16 = packed record
R, G, B, A: Word;
end;
PBGR = ^TBGR;
TBGR = packed record
B, G, R: Byte;
end;
PBGR16 = ^TBGR16;
TBGR16 = packed record
B, G, R: Word;
end;
PBGRA = ^TBGRA;
TBGRA = packed record
B, G, R, A: Byte;
end;
PBGRA16 = ^TBGRA16;
TBGRA16 = packed record
B, G, R, A: Word;
end;
PHLS = ^THLS;
THLS = packed record
H, L, S: Byte;
end;
PHLSFloat = ^THLSFloat;
THLSFloat = packed record
H, L, S: Single;
end;
TColorScheme = (
csUnknown,
csIndexed, // Palette format.
csIndexedA, // Palette format with alpha channel.
csG, // Gray scale.
csGA, // Gray scale with alpha channel.
csRGB, // Red, green, blue.
csRGBA, // RGB with alpha channel
csBGR, // RGB in reversed order.
csBGRA, // BGR with alpha channel.
csCMY, // Cyan, agenta, yellow.
csCMYK, // CMY with black.
csCIELab, // CIE color format using luminance and chromaticities.
csITULab, // ITU L*a*b*
csCIELog2L, // CIE Log2(L)
csCIELog2Luv, // CIE Log2(L) (u', v')
csYCbCr, // Another format using luminance and chromaticities.
csPhotoYCC // A modified YCbCr version used for photo CDs.
);
TConvertOptions = set of (
coAlpha, // alpha channel is to be considered (this value is usually automatically set depending on
// the color scheme)
coApplyGamma, // target only, gamma correction must take place
coNeedByteSwap, // endian switch needed
coLabByteRange, // CIE L*a*b* only, luminance range is from 0..255 instead 0..100
coLabChromaOffset // CIE L*a*b* only, chrominance values a and b are given in 0..255 instead -128..127
);
// format of the raw data to create a color palette from
TRawPaletteFormat = (
pfInterlaced8Triple, // rgb triple with 8 bits per component
pfInterlaced8Quad, // rgb quad with 8 bits per component (fourth entry is reserved as in Windows' logical palette)
pfPlane8Triple, // 3 separate planes of data with 8 bits per component
pfPlane8Quad,
pfInterlaced16Triple,// rgb triple with 16 bits per component
pfInterlaced16Quad,
pfPlane16Triple, // 3 separate planes of data with 16 bits per component
pfPlane16Quad
);
// TConversionMethod describes the general parameter list to which each implemented conversion method conforms.
// Note: Source is defined as open array parameter to allow plane and interlaced source data.
TConversionMethod = procedure(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte) of object;
TColorManager = class
private
FChanged: Boolean; // set if any of the parameters changed
FSourceBPS, // bits per sample of source data (allowed values are 1, 2, 4, 8, 16)
FTargetBPS, // bits per sample of target data (allowed values are 1, 2, 4, 8, 16)
FSourceSPP, // samples per source pixel (allowed values are 1, 3, 4)
FTargetSPP: Byte; // samples per target pixel (allowed values are 1, 3, 4)
FMainGamma, // primary gamma value which is usually read from a file (default is 1)
FDisplayGamma: Single; // (constant) gamma value of the current monitor (default is 2.2)
FGammaTable: array[Byte] of Byte; // contains precalculated gamma values for each possible component value
// (range is 0..255)
FYCbCrCoefficients: array[0..2] of Single;
FHSubsampling,
FVSubSampling: Byte; // additional parameters used for YCbCr conversion
FTotalSubSampling: Byte; // very small optimization
FCrToRedTable, // lookup tables used for YCbCr conversion
FCbToBlueTable,
FCrToGreenTable,
FCbToGreenTable: array of Integer;
fSubsamplingBuffers: Array of array of Byte; //since we get to know row size
//only when conversion begins, using managed type is much, much simpler
fCurSubsamplingRow: Integer;
FSourceScheme,
FTargetScheme: TColorScheme;
FRowConversion: TConversionMethod; // procedure variable for the actual conversion method used
FSourceOptions,
FTargetOptions: TConvertOptions;
procedure SetSourceOptions(const Value: TConvertOptions); // options to control conversion
protected
// Low level conversion helper used to convert one pixel component.
function ComponentGammaConvert(Value: Byte): Byte;
function ComponentNoConvert16(Value: Word): Word;
function ComponentNoConvert8(Value: Byte): Byte;
function ComponentScaleConvert(Value: Word): Byte;
function ComponentScaleGammaConvert(Value: Word): Byte;
function ComponentSwapScaleGammaConvert(Value: Word): Byte;
function ComponentSwapScaleConvert(Value: Word): Byte;
function ComponentSwapConvert(Value: Word): Word;
// row conversion routines
procedure RowConvertBGR2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertBGR2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertCIELAB2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertCIELAB2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertCMYK2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertCMYK2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertGray(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertIndexed8(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertIndexedBoth16(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertIndexedSource16(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertIndexedTarget16(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertRGB2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertRGB2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertPhotoYCC2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertPhotoYCC2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertYCbCr2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertYCbCr2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertSubsamplingYCbCr2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
procedure RowConvertSubsamplingYCbCr2RGB(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
// other general routines
procedure CreateYCbCrLookup;
function GetPixelFormat(Index: Integer): TPixelFormat;
procedure PrepareConversion;
procedure SetSourceBitsPerSample(const Value: Byte);
procedure SetSourceColorScheme(const Value: TColorScheme);
procedure SetSourceSamplesPerPixel(const Value: Byte);
procedure SetTargetBitsPerSample(const Value: Byte);
procedure SetTargetColorScheme(const Value: TColorScheme);
procedure SetTargetSamplesPerPixel(const Value: Byte);
public
constructor Create;
procedure ConvertRow(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
function CreateColorPalette(Data: array of Pointer; DataFormat: TRawPaletteFormat; ColorCount: Cardinal;
RGB: Boolean): HPALETTE;
function CreateGrayscalePalette(MinimumIsWhite: Boolean): HPALETTE;
procedure SetGamma(MainGamma: Single; DisplayGamma: Single = DefaultDisplayGamma);
procedure SetYCbCrParameters(Values: array of Single; HSubSampling, VSubSampling: Byte);
property SourceBitsPerSample: Byte read FSourceBPS write SetSourceBitsPerSample;
property SourceColorScheme: TColorScheme read FSourceScheme write SetSourceColorScheme;
property SourceOptions: TConvertOptions read FSourceOptions write SetSourceOptions;
property SourcePixelFormat: TPixelFormat index 0 read GetPixelFormat;
property SourceSamplesPerPixel: Byte read FSourceSPP write SetSourceSamplesPerPixel;
property TargetBitsPerSample: Byte read FTargetBPS write SetTargetBitsPerSample;
property TargetColorScheme: TColorScheme read FTargetScheme write SetTargetColorScheme;
property TargetOptions: TConvertOptions read FTargetOptions write FTargetOptions;
property TargetPixelFormat: TPixelFormat index 1 read GetPixelFormat;
property TargetSamplesPerPixel: Byte read FTargetSPP write SetTargetSamplesPerPixel;
end;
// common color convertion functions
function HLStoRGB(const HLS: THLSFloat): TRGBFloat;
function RGBToHLS(const RGB: TRGBFloat): THLSFloat;
function HLSInterpolation(const HLS1, HLS2: THLSFloat; Ratio: Extended): THLSFloat;
function RGBInterpolation(const RGB1, RGB2: TRGBFloat; Ratio: Extended): TRGBFloat; overload;
function RGBInterpolation(const RGB1, RGB2: TRGB; Ratio: Extended): TRGB; overload;
// color utility functions
function BrightenColor(const Color: TColor; Amount: Extended): TColor; overload;
function BrightenColor(const Color: TRGB; Amount: Extended): TRGB; overload;
function DarkenColor(const Color: TColor; Amount: Extended): TColor; overload;
function DarkenColor(const Color: TRGB; Amount: Extended): TRGB; overload;
function MakeHLS(const H, L, S: Byte): THLS; overload;
function MakeHLS(const H, L, S: Single): THLSFloat; overload;
function MakeRGB(const R, G, B: Byte): TRGB; overload;
function MakeRGB(const R, G, B: Single): TRGBFloat; overload;
// general utility functions
function ClampByte(Value: Integer): Byte;
function MulDiv16(Number, Numerator, Denominator: Word): Word;
//----------------------------------------------------------------------------------------------------------------------
implementation
uses
Math, SysUtils;
type
EColorConversionError = class(Exception);
//----------------- helper functions -----------------------------------------------------------------------------------
procedure ShowError(const Msg: String);
begin
raise EColorConversionError.Create(Msg);
end;
//----------------------------------------------------------------------------------------------------------------------
function ClampByte(Value: Integer): Byte;
// ensures Value is in the range 0..255, values < 0 are clamped to 0 and values > 255 are clamped to 255
{$IFDEF ResortToPurePascal}
begin
if Value <= 0 then
Result := 0
else if Value >= 255 then
Result := 255
else
Result := Value;
{$ELSE}
asm
OR EAX, EAX
JNS @@positive
XOR EAX, EAX
RET
@@positive:
CMP EAX, 255
JBE @@OK
MOV EAX, 255
@@OK:
{$ENDIF}
end;
//----------------------------------------------------------------------------------------------------------------------
function MulDiv16(Number, Numerator, Denominator: Word): Word;
// faster equivalent to Windows' MulDiv function
// Number is passed via AX
// Numerator is passed via DX
// Denominator is passed via CX
// Result is passed via AX
// Note: no error checking takes place. Denominator must be > 0!
{$IFDEF ResortToPurePascal}
//got division by zero exception on x64 when tried asm. Something changed...
begin
Result := Number * Numerator div Denominator;
{$ELSE}
asm
MUL DX
DIV CX
{$ENDIF}
end;
//----------------- common color conversion functions ------------------------------------------------------------------
function HLStoRGB(const HLS: THLSFloat): TRGBFloat;
// converts from HLS (hue, luminance, saturation) to RGB using floating point math
// Input parameters and result values are all in the range 0..1.
//--------------- local function --------------------------------------------
function HueToRGB(m1, m2, hue: Extended): Extended;
begin
if hue > 1 then
hue := hue - 1
else
if hue < 0 then
hue := hue + 1;
if 6 * hue < 1 then
Result := m1 + (m2 - m1) * hue * 6
else
if 2 * hue < 1 then
Result := m2
else
if 3 * hue < 2 then
Result := m1 + (m2 - m1) * (2 / 3 - hue) * 6
else
Result := m1;
end;
//--------------- end local function ----------------------------------------
var
m1, m2: Single;
begin
with HLS, Result do
begin
if S = 0 then
begin
// achromatic case (no hue)
R := L;
G := L;
B := L
end
else
begin
if L <= 0.5 then
m2 := L * (S + 1)
else
m2 := L + S - L * S;
m1 := 2 * L - m2;
R := HueToRGB(m1, m2, H + 1 / 3);
G := HueToRGB(m1, m2, H);
B := HueToRGB(m1, m2, H - 1 / 3)
end;
end;
end;
//----------------------------------------------------------------------------------------------------------------------
function RGBToHLS(const RGB: TRGBFloat): THLSFloat;
// converts from RGB to HLS using floating point math
// Input parameters and result values are all in the range 0..1.
var
Delta,
Max,
Min: Extended;
begin
with RGB, Result do
begin
Max := MaxValue([R, G, B]);
Min := MinValue([R, G, B]);
L := (Max + Min) / 2;
if Max = Min then
begin
// achromatic case
S := 0;
H := 0; // undefined
end
else
begin
Delta := Max - Min;
if L < 0.5 then
S := Delta / (Max + Min)
else
S := Delta / (2 - (Max + Min));
if R = Max then
H := (G - B) / Delta
else
if G = Max then
H := 2 + (B - R) / Delta
else
if B = Max then
H := 4 + (R - G) / Delta;
H := H / 6;
if H < 0 then
H := H + 1;
end
end;
end;
//----------------------------------------------------------------------------------------------------------------------
function HLSInterpolation(const HLS1, HLS2: THLSFloat; Ratio: Extended): THLSFloat;
// interpolates linearly from HLS1 to HLS2 with the given ratio
// Parameters as well as result are in the range 0..1.
begin
if Ratio <= 0 then
Result := HLS1
else
if Ratio >= 1 then
Result := HLS2
else
begin
Result.H := HLS1.H + (HLS2.H - HLS1.H) * Ratio;
Result.L := HLS1.L + (HLS2.L - HLS1.L) * Ratio;
Result.S := HLS1.S + (HLS2.S - HLS1.S) * Ratio;
end;
end;
//----------------------------------------------------------------------------------------------------------------------
function RGBInterpolation(const RGB1, RGB2: TRGB; Ratio: Extended): TRGB;
// interpolates linearly from RGB1 to RGB2 with the given ratio using the HLS color space
// which produces more natural results
// Parameters as well as result are in the range 0..255.
var
HLS1,
HLS2: THLSFloat;
RGB: TRGBFloat;
begin
if Ratio <= 0 then
Result := RGB1
else
if Ratio >= 1 then
Result := RGB2
else
begin
HLS1 := RGBToHLS(MakeRGB(RGB1.R / 255, RGB1.G / 255, RGB1.B / 255));
HLS2 := RGBToHLS(MakeRGB(RGB2.R / 255, RGB2.G / 255, RGB2.B / 255));
HLS2.H := HLS1.H + (HLS2.H - HLS1.H) * Ratio;
HLS2.L := HLS1.L + (HLS2.L - HLS1.L) * Ratio;
HLS2.S := HLS1.S + (HLS2.S - HLS1.S) * Ratio;
RGB := HLSToRGB(HLS2);
Result.R := Round(RGB.R * 255);
Result.G := Round(RGB.G * 255);
Result.B := Round(RGB.B * 255);
end;
end;
//----------------------------------------------------------------------------------------------------------------------
function RGBInterpolation(const RGB1, RGB2: TRGBFloat; Ratio: Extended): TRGBFloat;
// interpolates linearly from RGB1 to RGB2 with the given ratio using the HLS color space
// which produces more natural results
// Parameters as well as result are in the range 0..1.
var
HLS1, HLS2: THLSFloat;
begin
if Ratio <= 0 then
Result := RGB1
else
if Ratio >= 1 then
Result := RGB2
else
begin
HLS1 := RGBToHLS(RGB1);
HLS2 := RGBToHLS(RGB2);
HLS2.H := HLS1.H + (HLS1.H - HLS2.H) * Ratio;
HLS2.L := HLS1.L + (HLS1.L - HLS2.L) * Ratio;
HLS2.S := HLS1.S + (HLS1.S - HLS2.S) * Ratio;
Result := HLSToRGB(HLS2);
end;
end;
//----------------- color utility functions ----------------------------------------------------------------------------
function BrightenColor(const Color: TColor; Amount: Extended): TColor;
// Brightens the given RGB color by the given amount using the HLS color model (increasing luminance).
// Amount is a percent value (in the range 0..1) which determines by which amount the source color should
// be brightened.
var
WinColor: COLORREF;
HLS: THLSFloat;
RGB: TRGBFloat;
begin
WinColor := ColorToRGB(Color);
HLS := RGBToHLS(MakeRGB((WinColor and $FF) / 255, ((WinColor shr 8) and $FF) / 255, ((WinColor shr 16) and $FF) / 255));
// brighten means to increase luminance
HLS.L := (1 + Amount) * HLS.L;
RGB := HLSToRGB(HLS);
Result := Windows.RGB(ClampByte(Round(255 * RGB.R)), ClampByte(Round(255 * RGB.G)), ClampByte(Round(255 * RGB.B)));
end;
//----------------------------------------------------------------------------------------------------------------------
function BrightenColor(const Color: TRGB; Amount: Extended): TRGB;
var
HLS: THLSFloat;
RGB: TRGBFloat;
begin
HLS := RGBToHLS(MakeRGB(Color.R / 255, Color.G / 255, Color.B / 255));
HLS.L := (1 + Amount) * HLS.L;
RGB := HLSToRGB(HLS);
Result := MakeRGB(ClampByte(Round(255 * RGB.R)), ClampByte(Round(255 * RGB.G)), ClampByte(Round(255 * RGB.B)));
end;
//----------------------------------------------------------------------------------------------------------------------
function DarkenColor(const Color: TColor; Amount: Extended): TColor;
// Darkens the given RGB color by the given amount using the HLS color model (decreasing luminance).
// Amount is a percent value (in the range 0..1) which determines by which amount the source color should
// be darkened.
var
WinColor: COLORREF;
HLS: THLSFloat;
RGB: TRGBFloat;
begin
WinColor := ColorToRGB(Color);
HLS := RGBToHLS(MakeRGB((WinColor and $FF) / 255, ((WinColor shr 8) and $FF) / 255, ((WinColor shr 16) and $FF) / 255));
// darken means to decrease luminance
HLS.L := (1 - Amount) * HLS.L;
RGB := HLSToRGB(HLS);
Result := Windows.RGB(ClampByte(Round(255 * RGB.R)), ClampByte(Round(255 * RGB.G)), ClampByte(Round(255 * RGB.B)));
end;
//----------------------------------------------------------------------------------------------------------------------
function DarkenColor(const Color: TRGB; Amount: Extended): TRGB;
var
HLS: THLSFloat;
RGB: TRGBFloat;
begin
HLS := RGBToHLS(MakeRGB(Color.R / 255, Color.G / 255, Color.B / 255));
// darken means to decrease luminance
HLS.L := (1 - Amount) * HLS.L;
RGB := HLSToRGB(HLS);
Result := MakeRGB(ClampByte(Round(255 * RGB.R)), ClampByte(Round(255 * RGB.G)), ClampByte(Round(255 * RGB.B)));
end;
//----------------------------------------------------------------------------------------------------------------------
function MakeHLS(const H, L, S: Byte): THLS;
begin
Result.H := H;
Result.L := L;
Result.S := S;
end;
//----------------------------------------------------------------------------------------------------------------------
function MakeHLS(const H, L, S: Single): THLSFloat;
begin
Result.H := H;
Result.L := L;
Result.S := S;
end;
//----------------------------------------------------------------------------------------------------------------------
function MakeRGB(const R, G, B: Byte): TRGB;
begin
Result.R := R;
Result.G := G;
Result.B := B;
end;
//----------------------------------------------------------------------------------------------------------------------
function MakeRGB(const R, G, B: Single): TRGBFloat;
begin
Result.R := R;
Result.G := G;
Result.B := B;
end;
//----------------- TColorManager --------------------------------------------------------------------------------------
constructor TColorManager.Create;
// set some default values
begin
FSourceBPS := 8;
FTargetBPS := 8;
FSourceSPP := 3; // 24 bit format
FTargetSPP := 3; // 24 bit format
SetGamma(1, DefaultDisplayGamma);
FSourceScheme := csRGB;
FTargetScheme := csBGR;
// defaults are from CCIR Recommendation 601-1
FYCbCrCoefficients[0] := 0.299;
FYCbCrCoefficients[1] := 0.587;
FYCbCrCoefficients[2] := 0.114;
FHSubSampling := 1;
FVSubSampling := 1;
FChanged := True;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TColorManager.SetSourceOptions(const Value: TConvertOptions);
begin
if FSourceOptions <> Value then
begin
FSourceOptions := Value;
FChanged := True;
end;
end;
//----------------- low level conversion routines ----------------------------------------------------------------------
// These routines are used for conversions from 16 to 8 bit values, either with gamma correction or byte swap (or both).
function TColorManager.ComponentNoConvert8(Value: Byte): Byte;
begin
Result := Value;
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentNoConvert16(Value: Word): Word;
begin
Result := Value;
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentGammaConvert(Value: Byte): Byte;
begin
Result := FGammaTable[Value];
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentScaleConvert(Value: Word): Byte;
begin
Result := MulDiv16(Value, 255, 65535);
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentScaleGammaConvert(Value: Word): Byte;
begin
Result := FGammaTable[MulDiv16(Value, 255, 65535)];
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentSwapScaleGammaConvert(Value: Word): Byte;
begin
Result := FGammaTable[MulDiv16(Swap(Value), 255, 65535)];
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentSwapScaleConvert(Value: Word): Byte;
begin
Result := MulDiv16(Swap(Value), 255, 65535);
end;
//----------------------------------------------------------------------------------------------------------------------
function TColorManager.ComponentSwapConvert(Value: Word): Word;
begin
Result := Swap(Value);
end;
//----------------- row conversion routines ----------------------------------------------------------------------------
// Notes: Each method takes parameters for source and target data as well as the count of pixels to work on. This count
// determines the number of pixels in the target buffer. The actual source count may differ for special color
// schemes (like YCbCr) or interlaced lines.
// Mask is a parameter which determines (in a repeative manner) which source pixel should actually be transferred
// to the target buffer. A 1 in the corresponding bit (MSB is leftmost pixel) causes the transfer to happen.
// Usually, this parameter is $FF to transfer all pixels, but for interlaced images (e.g. as in PNG format)
// this will differ to limit pixel transfers. The bit mask only describes which target pixel is to skip. Source
// pixel must be packed.
// Windows DIBs are always byte aligned, so we don't need checks for byte alignments (in target).
procedure PurePascalROR(var value: Byte); //workaround for x64 version
//not universal ROR at all: works only for our task where only one bit is set every time
begin
if value = 1 then
value := $80
else
value := value shr 1;
end;
procedure TColorManager.RowConvertBGR2BGR(Source: array of Pointer; Target: Pointer; Count: Cardinal; Mask: Byte);
// same as ConvertBGR2RGB but for BGR target schemes
var
SourceR16,
SourceG16,
SourceB16,
SourceA16: PWord;
SourceR8,
SourceG8,
SourceB8,
SourceA8: PByte;
TargetRun16: PBGR16;
TargetRunA16: PBGRA16;
TargetRun8: PBGR;
TargetRunA8: PBGRA;
BitRun: Byte;
Convert8_8: function(Value: Byte): Byte of object;
Convert16_8: function(Value: Word): Byte of object;
Convert16_8Alpha: function(Value: Word): Byte of object;
Convert16_16: function(Value: Word): Word of object;
SourceIncrement,
TargetIncrement: Cardinal;
CopyAlpha: Boolean;
begin
BitRun := $80;
// determine alpha handling once
CopyAlpha := False;
if coAlpha in FSourceOptions then
begin
SourceIncrement := SizeOf(TRGBA);
TargetIncrement := SizeOf(TRGB);
if coAlpha in FTargetOptions then
CopyAlpha := True;
end
else
begin
SourceIncrement := SizeOf(TRGB);
if coAlpha in FTargetOptions then
TargetIncrement := SizeOf(TRGBA)
else
TargetIncrement := SizeOf(TRGB);
end;
// in planar mode source increment is always 1
if Length(Source) > 1 then
SourceIncrement := 1;
case FSourceBPS of
8:
begin
if Length(Source) = 1 then
begin
// interleaved mode
SourceB8 := Source[0];
SourceG8 := SourceB8; Inc(SourceG8);
SourceR8 := SourceG8; Inc(SourceR8);
SourceA8 := SourceR8; Inc(SourceA8);
end
else
begin
SourceB8 := Source[0];
SourceG8 := Source[1];
SourceR8 := Source[2];
if coAlpha in FSourceOptions then
SourceA8 := Source[3]
else
SourceA8 := nil;
end;
case FTargetBPS of
8: // 888 to 888
begin
if coApplyGamma in FTargetOptions then
Convert8_8 := ComponentGammaConvert
else
Convert8_8 := ComponentNoConvert8;
if CopyAlpha then
begin
TargetRunA8 := Target;
while Count > 0 do
begin
if Boolean(Mask and BitRun) then
begin
TargetRunA8.R := Convert8_8(SourceR8^);
TargetRunA8.G := Convert8_8(SourceG8^);
TargetRunA8.B := Convert8_8(SourceB8^);
// alpha values are never gamma corrected
TargetRunA8.A := SourceA8^;
Inc(SourceB8, SourceIncrement);
Inc(SourceG8, SourceIncrement);
Inc(SourceR8, SourceIncrement);
Inc(SourceA8, SourceIncrement);
end;
{$IFDEF ResortToPurePascal}
PurePascalROR(BitRun);
{$ELSE}
asm ROR BYTE PTR [BitRun], 1 end;
{$ENDIF}
Dec(Count);
Inc(TargetRunA8);
end;
end
else
begin
TargetRun8 := Target;
while Count > 0 do
begin
if Boolean(Mask and BitRun) then
begin
TargetRun8.R := Convert8_8(SourceR8^);
TargetRun8.G := Convert8_8(SourceG8^);
TargetRun8.B := Convert8_8(SourceB8^);
Inc(SourceB8, SourceIncrement);
Inc(SourceG8, SourceIncrement);
Inc(SourceR8, SourceIncrement);
end;
{$IFDEF ResortToPurePascal}
PurePascalROR(BitRun);
{$ELSE}
asm ROR BYTE PTR [BitRun], 1 end;
{$ENDIF}
Dec(Count);
Inc(PByte(TargetRun8), TargetIncrement);
end;
end;
end;
16: // 888 to 161616
begin
if coApplyGamma in FTargetOptions then
Convert8_8 := ComponentGammaConvert
else
Convert8_8 := ComponentNoConvert8;
if coNeedByteSwap in FSourceOptions then
Convert16_16 := ComponentSwapConvert
else
Convert16_16 := ComponentNoConvert16;
if Length(Source) = 1 then
begin
SourceB8 := Source[0];
SourceG8 := SourceB8; Inc(SourceG8);
SourceR8 := SourceG8; Inc(SourceR8);
SourceA8 := SourceR8; Inc(SourceA8);
end
else
begin
SourceB8 := Source[0];
SourceG8 := Source[1];
SourceR8 := Source[2];
if coAlpha in FSourceOptions then
SourceA8 := Source[3]
else
SourceA8 := nil;
end;
if CopyAlpha then
begin
TargetRunA16 := Target;
while Count > 0 do
begin
if Boolean(Mask and BitRun) then
begin
TargetRunA16.R := Convert16_16(MulDiv16(Convert8_8(SourceR8^), 65535, 255));
TargetRunA16.G := Convert16_16(MulDiv16(Convert8_8(SourceG8^), 65535, 255));
TargetRunA16.B := Convert16_16(MulDiv16(Convert8_8(SourceB8^), 65535, 255));
TargetRunA16.A := Convert16_16(MulDiv16(SourceA8^, 65535, 255));
Inc(SourceB8, SourceIncrement);
Inc(SourceG8, SourceIncrement);
Inc(SourceR8, SourceIncrement);
Inc(SourceA8, SourceIncrement);
end;
{$IFDEF ResortToPurePascal}
PurePascalROR(BitRun);
{$ELSE}
asm ROR BYTE PTR [BitRun], 1 end;
{$ENDIF}
Dec(Count);
Inc(TargetRunA16);
end;
end
else
begin
TargetRun16 := Target;
while Count > 0 do
begin
if Boolean(Mask and BitRun) then
begin
TargetRun16.R := Convert16_16(MulDiv16(Convert8_8(SourceR8^), 65535, 255));
TargetRun16.G := Convert16_16(MulDiv16(Convert8_8(SourceG8^), 65535, 255));
TargetRun16.B := Convert16_16(MulDiv16(Convert8_8(SourceB8^), 65535, 255));