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GR32_Add_BlendModes.pas
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GR32_Add_BlendModes.pas
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{
This unit adds most popular blendmodes + some new ones to GR32.
Some are already available in other GR32 units, but are for the
completeness listed here.
Some blendmodes have been created from the descriptions Adobe Photoshop
gives in the help file.
Others come from Jens Gruschel & Francesco Savastano(and others) from
various newsgroup discussions...
I provide the Reflection, Custom & Bright Light modes.
The custom mode is a 0..255,0..255 LUT where you can load your
own blendmaps to - The bad thing in this implementation is that
if several layers uses custom mode with different LUTs, you
have to take care of the temporary loading yourself.
For descriptions and other stuff see Jens Gruschels page at:
http://www.pegtop.net/delphi/blendmodes/
If you have coded some interesting modes & want them added to this unit,
pls send me the code along with a description of purpose and use
(i.e. "Good for adding bright objects" or so).
If you find any lines or structures that may be optimized or if
you're an shark with asm and want to rewrite the procs - please
contact me - lots of the rewritting is just copy/paste stuff so ... :)
Michael Hansen.
}
unit GR32_Add_BlendModes;
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{ For the blending algorithm, you could find it at:
http://en.wikipedia.org/wiki/Alpha_compositing
http://www.answers.com/topic/alpha-compositing
Quote to Michael Hansen:
------------------------
A correct alpha compositing solution should use the merge formula to blend
the RGB result of the blendmode with the background ARGB, using foreground
alpha (eventually multiplied with masteralpha variable):
F: Foreground
B: Background
C: Combined
O: Output
Crgb = blendmode(Frgb, Brgb)
optional master alpha:
Fa = Fa * Ma
Oa = Fa + Ba * (1 - Fa)
Orgb = (Crgb * Fa + (Brgb * Ba) * (1 - Fa)) / Oa
------------------------------------------------
So, according to the above formula, the blending code should be:
rA := fA + bA - bA * fA div 255;
rR := ( BlendR * fA + bR * bA - bR * bA * fA div 255 ) div rA;
rG := ( BlendG * fA + bG * bA - bG * bA * fA div 255 ) div rA;
rB := ( BlendB * fA + bB * bA - bB * bA * fA div 255 ) div rA;
Quote to Anders Melander:
------------------------
The compositing formula used by PhotoShop is [drumroll]:
rAlpa := fAlpha + bAlpha * (1 - fAlpha);
rColor := (1 - fAlpha / rAlpha) * bColor +
(fAlpha / rAlpha) * ((1 - bAlpha) * fColor + bAlpha * Blend(fColor, bColor));
------------------------------------------------------------------------------
So, according to the above formula, the blending code should be:
rA := fA + bA - ba * fa div 255;
rR := bR - bR * fA div rA + (fR - fR * bA div 255 + BlendR * bA div 255) * fA div rA;
rG := bG - bG * fA div rA + (fG - fG * bA div 255 + BlendG * bA div 255) * fA div rA;
rB := bB - bB * fA div rA + (fB - fB * bA div 255 + BlendB * bA div 255) * fA div rA;
After Optimization:
rA := fA + bA - ba * fa div 255;
rR := bR - bR * fA div rA + (fR - (fR - BlendR) * bA div 255) * fA div rA;
rG := bG - bG * fA div rA + (fG - (fG - BlendG) * bA div 255) * fA div rA;
rB := bB - bB * fA div rA + (fB - (fB - BlendB) * bA div 255) * fA div rA;
We apply the Photoshop's formula to all the code of blending methods.
NOTE:
Michael Hansen has correct the first formula to:
Oa = Fa + Ba * (1 - Fa)
Crgb = Frgb + (blendmode(Frgb, Brgb) - Frgb) * Ba
Orgb = (Crgb * Fa + (Brgb * Ba) * (1 - Fa)) / Oa
This formula has the same result as Anders Melander's formula, proven by
Anders Melander.
Quote to Anders Melander
------------------------
As far as I can tell the foreground & blend terms are exactly the same (once
expanded), but at first look the background term appears different:
1) Foreground/blend term
1.1) Mine:
(fAlpha/rAlpha)(fColor*(1 - bAlpha) + bAlpha*Blend) [1a]
1.2) Yours:
Fa*(Frgb + Ba*(Blend - Frgb))/Oa = [2a]
(Fa/Oa)(Frgb + Ba*Blend - Ba*Frgb) = [2b]
(Fa/Oa)(Frgb*(1 - Ba) + Ba*Blend) = [2c]
(fAlpha/rAlpha)(fColor*(1 - bAlpha) + bAlpha*Blend) [2d]
[1a] = [2d] => Our foreground and blend terms are identical.
2) Background term
2.1) Mine:
bColor*(1 - fAlpha/rAlpha) [3a]
Expanding rAlpha we get:
bColor*(1 - fAlpha/(fAlpha + bAlpha*(1 - fAlpha))) = [3b]
(handwave)
bColor*bAlpha*(fAlpha-1)/(bAlpha*(fAlpha-1)-fAlpha) [3c]
2.2) Yours:
(Brgb*Ba)(1 - Fa)/Oa = [4a]
Brgb*(1 - Fa)(Ba/Oa) = [4b]
bColor*(1 - fAlpha)(bAlpha/rAlpha) [4c]
Expanding rAlpha we get:
bColor*(1 - fAlpha)(bAlpha/(fAlpha + bAlpha*(1 - fAlpha))) = [4d]
(handwave)
bColor*bAlpha*(fAlpha-1)/(bAlpha*(fAlpha-1)-fAlpha)) [4e]
[3c] = [4e] => Our background terms are identical.
So both our compositing formulas are in fact identical.
3) Isolating the terms we can verify that the composition formula is correct:
Alpha:
rAlpha := fAlpha + bAlpha*(1 - fAlpha) [5a]
Foreground term:
nS := (fAlpha/rAlpha)(fColor*(1 - bAlpha)) [5b]
Background term:
nD := bColor*(1 - fAlpha/rAlpha) [5c]
Blend term:
nB := (fAlpha/rAlpha)(bAlpha*Blend) [5d]
Result:
rColor := nS + nD + nB; [5e]
3.1) For Normal blend mode, Blend(fColor, bColor) = fColor, the blend term
reduces to:
nB := (fAlpha/rAlpha)(bAlpha*fColor) [5f]
3.1a) Solving for (fAlpha = bAlpha = 1) we get:
rAlpha = 1 + 1*(1-1) = 1
nS = (1/1)(fColor*(1-1)) = 0
nD = bColor*(1-1/1) = 0
nB = (1/1)(1*fColor) = fColor
rColor = 0+0+fColor = fColor
Correct.
3.1b) Solving for (fAlpha = 1, bAlpha = 0) we get:
rAlpha = 1 + 0*(1-1) = 1
nS = (1/1)(fColor*(1-0)) = fColor
nD = bColor*(1-1/1) = 0
nB = (1/1)(0*fColor) = 0
rColor = 0+fColor+0 = fColor
Correct.
3.1c) Solving for (fAlpha = 0, bAlpha = 1) we get:
rAlpha = 0 + 1*(1-0) = 1
nS = (0/1)(fColor*(1-1)) = 0
nD = bColor*(1-0/1) = bColor
nB = (0/1)(1*fColor) = 0
rColor = 0+bColor+0 = 0
Correct.
3.1d) Solving for (fAlpha = 0.5, bAlpha = 0.5) we get:
rAlpha = 0.5 + 0.5*(1-0.5) = 0.75
nS = (0.5/0.75)(fColor*(1-0.5)) = fColor/3
nD = bColor*(1-0.5/0.75) = bColor/3
nB = (0.5/0.75)(0.5*fColor) = fColor/3
rColor = fColor/3+bColor/3+fColor/3 = 2/3*fColor + 1/3*bColor
Correct.
3.1e) Solving for (fAlpha = 0.5, bAlpha = 1) we get:
rAlpha = 0.5 + 1*(1-0.5) = 1
nS = (0.5/1)(fColor*(1-1)) = 0
nD = bColor*(1-0.5/1) = bColor/2
nB = (0.5/1)(1*fColor) = fColor/2
rColor = 0+bColor/2+fColor/2 = 1/2*fColor + 1/2*bColor
Correct.
3.2) For other blend modes, substitute Blend in [5d] with the blend result,
rinse and repeat.
I have already verified that the output of my implementation of the above
matches that of PhotoShop.
-----------------------------
Commented by: Ma Xiaoguang and Ma Xiaoming
}
{ Updates:
2013-06-06
Added Dissolve blend mode by Ma Xiaoguang and Ma Xiaoming.
}
interface
uses
Sysutils, Classes, GR32;
type
TBlendMode32 = (bbmNormal32,
bbmMultiply32,
bbmScreen32,
bbmOverlay32,
bbmBrightLight32,
bbmSoftLightXF32,
bbmHardLight32,
bbmColorDodge32,
bbmColorBurn32,
bbmDarken32,
bbmLighten32,
bbmDifference32,
bbmNegation32,
bbmExclusion32,
bbmHue32,
bbmSaturation32,
bbmColor32,
bbmLuminosity32,
bbmAverage32,
bbmInverseColorDodge32,
bbmInverseColorBurn32,
bbmSoftColorDodge32,
bbmSoftColorBurn32,
bbmReflect32,
bbmGlow32,
bbmFreeze32,
bbmHeat32,
bbmAdditive32,
bbmSubtractive32,
bbmInterpolation32,
bbmStamp32,
bbmXOR32,
bbmAND32,
bbmOR32,
bbmRed32,
bbmGreen32,
bbmBlue32,
bbmDissolve32);
{Blendmap - lookup table for Custom}
TBlendmap = array [0..65535] of TColor32;
{Just a wrapper to make procedures compatible - creation of object
not neccessary, access via blendmode variable}
TBlendMode = class
procedure NormalBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure MultiplyBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure ScreenBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure OverlayBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure SoftLightBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure HardLightBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure BrightLightBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure ColorDodgeBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure ColorBurnBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure DarkenBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure LightenBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure DifferenceBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure NegationBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure ExclusionBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure HueBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure SaturationBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure ColorBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure LuminosityBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure AverageBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure InverseColorDodgeBlend(F: TColor32; var B: TColor32; M: TColor32);
procedure InverseColorBurnBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure SoftColorDodgeBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure SoftColorBurnBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure ReflectBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure GlowBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure FreezeBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure HeatBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure AdditiveBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure SubtractiveBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure InterpolationBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure StampBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure xorBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure andBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure orBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure RedBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure GreenBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure BlueBlend (F: TColor32; var B: TColor32; M: TColor32);
procedure DissolveBlend (F: TColor32; var B: TColor32; M: TColor32);
end;
function BlendModeList: TStringList;
procedure GetBlendModeList(AList: TStrings); //safety: dont create, just fill.
function GetBlendMode(Index: Integer): TPixelCombineEvent;
function GetBlendIndex(Mode: TPixelCombineEvent): Integer;
function GetBlendModeString(const Mode: TBlendMode32): string;
function ARGBBlendByMode(const F, B: TColor32; const M: TColor32;
const Mode: TBlendMode32): TColor32;
var
Blendmode: TBlendMode;
BlendMap : TBlendMap;
implementation
{$WARN UNSAFE_TYPE OFF}
{$WARN UNSAFE_CODE OFF}
uses
Math, GR32_Blend;
var
SqrtTable: array [0 .. 65535] of Byte;
CosineTab: array [0 .. 255] of Integer;
ProbTable: array [0..100, 0..99] of Boolean;
const
SEmptySource = 'The source is nil';
function BlendModeList: TStringList;
begin
Result := TStringList.Create;
GetBlendModeList(Result);
end;
procedure GetBlendModeList(AList: TStrings);
begin
with AList do
begin
BeginUpdate();
try
Add('Normal');
Add('Multiply');
Add('Screen');
Add('Overlay');
Add('Soft Light');
Add('Hard Light');
Add('Bright Light');
Add('Color Dodge');
Add('Color Burn');
Add('Darken');
Add('Lighten');
Add('Difference');
Add('Negation');
Add('Exclusion');
Add('Hue');
Add('Saturation');
Add('Color');
Add('Luminosity');
Add('Average');
Add('Inverse Color Dodge');
Add('Inverse Color Burn');
Add('Soft Color Dodge');
Add('Soft Color Burn');
Add('Reflect');
Add('Glow');
Add('Freeze');
Add('Heat');
Add('Additive');
Add('Subtractive');
Add('Interpolation');
Add('Stamp');
Add('XOR');
Add('AND');
Add('OR');
Add('Red');
Add('Green');
Add('Blue');
Add('Dissolve');
finally
EndUpdate;
end;
end;
end;
function GetBlendIndex(Mode: TPixelCombineEvent): Integer;
var
PM, PB: Pointer;
Tmp : TPixelCombineEvent;
begin
{ Workaround here.. couldn't find any other way to do this... }
PM := @Mode;
with BlendMode do
begin
Tmp := NormalBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 0;
Exit;
end;
Tmp := MultiplyBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 1;
Exit;
end;
Tmp := ScreenBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 2;
Exit;
end;
Tmp := OverlayBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 3;
Exit;
end;
Tmp := SoftLightBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 4;
Exit;
end;
Tmp := HardLightBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 5;
Exit;
end;
Tmp := BrightLightBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 6;
Exit;
end;
Tmp := ColorDodgeBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 7;
Exit;
end;
Tmp := ColorBurnBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 8;
Exit;
end;
Tmp := DarkenBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 9;
Exit;
end;
Tmp := LightenBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 10;
Exit;
end;
Tmp := DifferenceBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 11;
Exit;
end;
Tmp := NegationBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 12;
Exit;
end;
Tmp := ExclusionBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 13;
Exit;
end;
Tmp := HueBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 14;
Exit;
end;
Tmp := SaturationBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 15;
Exit;
end;
Tmp := ColorBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 16;
Exit;
end;
Tmp := LuminosityBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 17;
Exit;
end;
Tmp := AverageBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 18;
Exit;
end;
Tmp := InverseColorDodgeBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 19;
Exit;
end;
Tmp := InverseColorBurnBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 20;
Exit;
end;
Tmp := SoftColorDodgeBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 21;
Exit;
end;
Tmp := SoftColorBurnBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 22;
Exit;
end;
Tmp := ReflectBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 23;
Exit;
end;
Tmp := GlowBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 24;
Exit;
end;
Tmp := FreezeBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 25;
Exit;
end;
Tmp := HeatBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 26;
Exit;
end;
Tmp := AdditiveBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 27;
Exit;
end;
Tmp := SubtractiveBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 28;
Exit;
end;
Tmp := InterpolationBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 29;
Exit;
end;
Tmp := StampBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 30;
Exit;
end;
Tmp := xorBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 31;
Exit;
end;
Tmp := andBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 32;
Exit;
end;
Tmp := orBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 33;
Exit;
end;
Tmp := RedBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 34;
Exit;
end;
Tmp := GreenBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 35;
Exit;
end;
Tmp := BlueBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 36;
Exit;
end;
Tmp := DissolveBlend;
PB := @Tmp;
if PM = PB then
begin
Result := 37;
Exit;
end;
Result := -1; { Unknown address }
end;
end;
function GetBlendMode(Index: Integer): TPixelCombineEvent;
begin
with BlendMode do
begin
case Index of
-1:
begin
Result := nil;
end;
0:
begin
Result := NormalBlend;
end;
1:
begin
Result := MultiplyBlend;
end;
2:
begin
Result := ScreenBlend;
end;
3:
begin
Result := OverlayBlend;
end;
4:
begin
Result := SoftLightBlend;
end;
5:
begin
Result := HardLightBlend;
end;
6:
begin
Result := BrightLightBlend;
end;
7:
begin
Result := ColorDodgeBlend;
end;
8:
begin
Result := ColorBurnBlend;
end;
9:
begin
Result := DarkenBlend;
end;
10:
begin
Result := LightenBlend;
end;
11:
begin
Result := DifferenceBlend;
end;
12:
begin
Result := NegationBlend;
end;
13:
begin
Result := ExclusionBlend;
end;
14:
begin
Result := HueBlend;
end;
15:
begin
Result := SaturationBlend;
end;
16:
begin
Result := ColorBlend;
end;
17:
begin
Result := LuminosityBlend;
end;
18:
begin
Result := AverageBlend;
end;
19:
begin
Result := InverseColorDodgeBlend;
end;
20:
begin
Result := InverseColorBurnBlend;
end;
21:
begin
Result := SoftColorDodgeBlend;
end;
22:
begin
Result := SoftColorBurnBlend;
end;
23:
begin
Result := ReflectBlend;
end;
24:
begin
Result := GlowBlend;
end;
25:
begin
Result := FreezeBlend;
end;
26:
begin
Result := HeatBlend;
end;
27:
begin
Result := AdditiveBlend;
end;
28:
begin
Result := SubtractiveBlend;
end;
29:
begin
Result := InterpolationBlend;
end;
30:
begin
Result := StampBlend;
end;
31:
begin
Result := xorBlend;
end;
32:
begin
Result := andBlend;
end;
33:
begin
Result := orBlend;
end;
34:
begin
Result := RedBlend;
end;
35:
begin
Result := GreenBlend;
end;
36:
begin
Result := BlueBlend;
end;
37:
begin
Result := DissolveBlend;
end;
end;
end;
end;
function GetBlendModeString(const Mode: TBlendMode32): string;
var
s: string;
begin
case Mode of
bbmNormal32 : s := 'Normal';
bbmMultiply32 : s := 'Multiply';
bbmScreen32 : s := 'Screen';
bbmOverlay32 : s := 'Overlay';
bbmBrightLight32 : s := 'Bright Light';
bbmSoftLightXF32 : s := 'Soft Light XF';
bbmHardLight32 : s := 'Hard Light';
bbmColorDodge32 : s := 'Color Dodge';
bbmColorBurn32 : s := 'Color Burn';
bbmDarken32 : s := 'Darken';
bbmLighten32 : s := 'Lighten';
bbmDifference32 : s := 'Difference';
bbmNegation32 : s := 'Negation';
bbmExclusion32 : s := 'Exclusion';
bbmHue32 : s := 'Hue';
bbmSaturation32 : s := 'Saturation';
bbmColor32 : s := 'Color';
bbmLuminosity32 : s := 'Luminosity';
bbmAverage32 : s := 'Average';
bbmInverseColorDodge32: s := 'Inverse Color Dodge';
bbmInverseColorBurn32 : s := 'Inverse Color Burn';
bbmSoftColorDodge32 : s := 'Soft Color Dodge';
bbmSoftColorBurn32 : s := 'Soft Color Burn';
bbmReflect32 : s := 'Reflect';
bbmGlow32 : s := 'Glow';
bbmFreeze32 : s := 'Freeze';
bbmHeat32 : s := 'Heat';
bbmAdditive32 : s := 'Additive';
bbmSubtractive32 : s := 'Subtractive';
bbmInterpolation32 : s := 'Interpolation';
bbmStamp32 : s := 'Stamp';
bbmXOR32 : s := 'XOR';
bbmAND32 : s := 'AND';
bbmOR32 : s := 'OR';
bbmRed32 : s := 'Red';
bbmGreen32 : s := 'Green';
bbmBlue32 : s := 'Blue';
bbmDissolve32 : s := 'Dissolve';
end;
Result := s;
end;
function ARGBBlendByMode(const F, B: TColor32; const M: TColor32;