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BitBltSimulation.class.st
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BitBltSimulation.class.st
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"
This class implements BitBlt, much as specified in the Blue Book spec.
Performance has been enhanced through the use of pointer variables such as sourceIndex and destIndex, and by separating several special cases of the inner loop.
Operation has been extended to color, with support for 1, 2, 4, 8, 16, and 32-bit pixel sizes. Conversion between different pixel sizes is facilitated by accepting an optional color map.
In addition to the original 16 combination rules, this BitBlt supports
16 fail (for old paint mode)
17 fail (for old mask mode)
18 sourceWord + destinationWord
19 sourceWord - destinationWord
20 rgbAdd: sourceWord with: destinationWord
21 rgbSub: sourceWord with: destinationWord
22 OLDrgbDiff: sourceWord with: destinationWord
23 OLDtallyIntoMap: destinationWord -- old vers doesn't clip to bit boundary
24 alphaBlend: sourceWord with: destinationWord
25 pixPaint: sourceWord with: destinationWord
26 pixMask: sourceWord with: destinationWord
27 rgbMax: sourceWord with: destinationWord
28 rgbMin: sourceWord with: destinationWord
29 rgbMin: sourceWord bitInvert32 with: destinationWord
30 alphaBlendConst: sourceWord with: destinationWord -- alpha passed as an arg
31 alphaPaintConst: sourceWord with: destinationWord -- alpha passed as an arg
32 rgbDiff: sourceWord with: destinationWord
33 tallyIntoMap: destinationWord
34 alphaBlendScaled: sourceWord with: destinationWord
35 alphaBlendScaled: sourceWord with: ""unused here - only used by FXBlt""
36 alphaBlendScaled: sourceWord with: ""unused here - only used by FXBlt""
37 rgbMul: sourceWord with: destinationWord
38 pixSwap: sourceWord with: destinationWord
39 pixClear: sourceWord with: destinationWord
40 fixAlpha: sourceWord with: destinationWord
41 rgbComponentAlpha: sourceWord with: destinationWord
This implementation has also been fitted with an experimental ""warp drive"" that allows abritrary scaling and rotation (and even limited affine deformations) with all BitBlt storage modes supported.
To add a new rule to BitBlt...
1. add the new rule method or methods in the category 'combination rules' of BBSim
2. describe it in the class comment of BBSim and in the class comment for BitBlt
3. add refs to initializeRuleTable in proper positions
4. add refs to initBBOpTable, following the pattern
"
Class {
#name : #BitBltSimulation,
#superclass : #SmartSyntaxInterpreterPlugin,
#instVars : [
'destForm',
'sourceForm',
'halftoneForm',
'combinationRule',
'destX',
'destY',
'width',
'height',
'sourceX',
'sourceY',
'clipX',
'clipY',
'clipWidth',
'clipHeight',
'sourceWidth',
'sourceHeight',
'sourceDepth',
'sourcePitch',
'sourceBits',
'sourcePPW',
'sourceMSB',
'destWidth',
'destHeight',
'destDepth',
'destPitch',
'destBits',
'destPPW',
'destMSB',
'bitCount',
'skew',
'mask1',
'mask2',
'preload',
'nWords',
'destMask',
'hDir',
'vDir',
'sourceIndex',
'sourceDelta',
'destIndex',
'destDelta',
'sx',
'sy',
'dx',
'dy',
'bbW',
'bbH',
'halftoneHeight',
'noSource',
'noHalftone',
'halftoneBase',
'sourceAlpha',
'srcBitShift',
'dstBitShift',
'bitBltOop',
'affectedL',
'affectedR',
'affectedT',
'affectedB',
'opTable',
'maskTable',
'ditherMatrix4x4',
'ditherThresholds16',
'ditherValues16',
'hasSurfaceLock',
'warpSrcShift',
'warpSrcMask',
'warpAlignShift',
'warpAlignMask',
'warpBitShiftTable',
'querySurfaceFn',
'lockSurfaceFn',
'unlockSurfaceFn',
'isWarping',
'cmFlags',
'cmMask',
'cmShiftTable',
'cmMaskTable',
'cmLookupTable',
'cmBitsPerColor',
'dither8Lookup',
'componentAlphaModeColor',
'componentAlphaModeAlpha',
'ungammaLookupTable',
'gammaLookupTable',
'numGCsOnInvocation',
'bitBltIsReceiver',
'endOfDestination',
'endOfSource'
],
#classVars : [
'AllOnes',
'AlphaIndex',
'BBClipHeightIndex',
'BBClipWidthIndex',
'BBClipXIndex',
'BBClipYIndex',
'BBColorMapIndex',
'BBDestFormIndex',
'BBDestXIndex',
'BBDestYIndex',
'BBHalftoneFormIndex',
'BBHeightIndex',
'BBLastIndex',
'BBRuleIndex',
'BBSourceFormIndex',
'BBSourceXIndex',
'BBSourceYIndex',
'BBWarpBase',
'BBWidthIndex',
'BBXTableIndex',
'BEBitBltIndex',
'BinaryPoint',
'BlueIndex',
'ColorMapFixedPart',
'ColorMapIndexedPart',
'ColorMapNewStyle',
'ColorMapPresent',
'CrossedX',
'EndOfRun',
'FixedPt1',
'FormBitsIndex',
'FormDepthIndex',
'FormHeightIndex',
'FormWidthIndex',
'GreenIndex',
'OpTable',
'OpTableSize',
'RedIndex'
],
#category : #'VMMaker-Interpreter'
}
{ #category : #'system simulation' }
BitBltSimulation class >> copyBitsFrom: aBitBlt [
"Simulate the copyBits primitive"
| proxy bb |
proxy := InterpreterProxy new.
proxy loadStackFrom: thisContext sender home.
bb := self simulatorClass new.
bb initialiseModule.
bb setInterpreter: proxy.
proxy success: (bb loadBitBltFrom: aBitBlt).
bb primitiveCopyBits.
^ proxy stackValue: 0
]
{ #category : #translation }
BitBltSimulation class >> declareCVarsIn: aCCodeGenerator [
"add option of fast path BitBLT code header"
aCCodeGenerator
addHeaderFile:'"sqAssert.h"';
addHeaderFile:'#ifdef ENABLE_FAST_BLT
#include "BitBltDispatch.h"
#else
// to handle the unavoidable decl in the spec of copyBitsFallback();
#define operation_t void
#endif'.
aCCodeGenerator var: 'opTable'
declareC: 'void *opTable[' , OpTableSize printString , ']'.
aCCodeGenerator var: 'maskTable'
declareC:'int maskTable[33] = {
0, 1, 3, 0, 15, 31, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 65535,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1
}'.
aCCodeGenerator var: 'ditherMatrix4x4'
declareC:'const int ditherMatrix4x4[16] = {
0, 8, 2, 10,
12, 4, 14, 6,
3, 11, 1, 9,
15, 7, 13, 5
}'.
aCCodeGenerator var: 'ditherThresholds16'
declareC:'const int ditherThresholds16[8] = { 0, 2, 4, 6, 8, 12, 14, 16 }'.
aCCodeGenerator var: 'ditherValues16'
declareC:'const int ditherValues16[32] = {
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30
}'.
aCCodeGenerator var: 'warpBitShiftTable'
declareC:'int warpBitShiftTable[32]'.
aCCodeGenerator var:'cmShiftTable'
type:'int *'.
aCCodeGenerator var:'cmMaskTable'
type:'unsigned int *'.
aCCodeGenerator var:'cmLookupTable'
type:'unsigned int *'.
aCCodeGenerator var: 'dither8Lookup'
declareC:' unsigned char dither8Lookup[4096]'.
aCCodeGenerator var:'ungammaLookupTable'
type: 'unsigned char *'.
aCCodeGenerator var:'gammaLookupTable'
type: 'unsigned char *'.
aCCodeGenerator
var: 'querySurfaceFn' declareC: 'int (*querySurfaceFn)(sqIntptr_t, int*, int*, int*, int*)';
var: 'lockSurfaceFn' declareC: 'sqIntptr_t (*lockSurfaceFn)(sqIntptr_t, int*, int, int, int, int)';
var: 'unlockSurfaceFn' declareC: 'int (*unlockSurfaceFn)(sqIntptr_t, int, int, int, int)'.
#(sourcePitch sourceWidth sourceHeight sourceDepth sourceMSB sx sy
destPitch destWidth destHeight destDepth destMSB dx dy bbW bbH)
do: [:ivar | aCCodeGenerator var: ivar type: #int].
#('sourceIndex' 'destIndex' 'endOfDestination' 'endOfSource') do:
[:ivar| aCCodeGenerator var: ivar type: #usqInt]
]
{ #category : #initialization }
BitBltSimulation class >> initialize [
"BitBltSimulation initialize"
self initializeRuleTable.
"Mask constants"
AllOnes := 16rFFFFFFFF.
BinaryPoint := 14.
FixedPt1 := 1 << BinaryPoint. "Value of 1.0 in Warp's fixed-point representation"
"Indices into stopConditions for scanning"
EndOfRun := 257.
CrossedX := 258.
"Form fields"
FormBitsIndex := 0.
FormWidthIndex := 1.
FormHeightIndex := 2.
FormDepthIndex := 3.
"BitBlt fields"
BBDestFormIndex := 0.
BBSourceFormIndex := 1.
BBHalftoneFormIndex := 2.
BBRuleIndex := 3.
BBDestXIndex := 4.
BBDestYIndex := 5.
BBWidthIndex := 6.
BBHeightIndex := 7.
BBSourceXIndex := 8.
BBSourceYIndex := 9.
BBClipXIndex := 10.
BBClipYIndex := 11.
BBClipWidthIndex := 12.
BBClipHeightIndex := 13.
BBColorMapIndex := 14.
BBWarpBase := 15.
BBLastIndex := 15.
BBXTableIndex := 16.
"BalloonEngineFields"
BEBitBltIndex := (Smalltalk classNamed: #BalloonEngine)
ifNil: [2]
ifNotNil: [:be| (be allInstVarNames indexOf: 'bitBlt') - 1].
"RGBA indexes"
RedIndex := 0.
GreenIndex := 1.
BlueIndex := 2.
AlphaIndex := 3.
"Color map flags"
ColorMapPresent := 1. "do we have one?"
ColorMapFixedPart := 2. "does it have a fixed part?"
ColorMapIndexedPart := 4. "does it have an indexed part?"
ColorMapNewStyle := 8. "new style color map"
]
{ #category : #initialization }
BitBltSimulation class >> initializeRuleTable [
"BitBltSimulation initializeRuleTable"
"**WARNING** You MUST change initBBOpTable if you change this"
OpTable := #(
"0" clearWord:with:
"1" bitAnd:with:
"2" bitAndInvert:with:
"3" sourceWord:with:
"4" bitInvertAnd:with:
"5" destinationWord:with:
"6" bitXor:with:
"7" bitOr:with:
"8" bitInvertAndInvert:with:
"9" bitInvertXor:with:
"10" bitInvertDestination:with:
"11" bitOrInvert:with:
"12" bitInvertSource:with:
"13" bitInvertOr:with:
"14" bitInvertOrInvert:with:
"15" destinationWord:with:
"16" destinationWord:with: "unused - was old paint"
"17" destinationWord:with: "unused - was old mask"
"18" addWord:with:
"19" subWord:with:
"20" rgbAdd:with:
"21" rgbSub:with:
"22" OLDrgbDiff:with:
"23" OLDtallyIntoMap:with:
"24" alphaBlend:with:
"25" pixPaint:with:
"26" pixMask:with:
"27" rgbMax:with:
"28" rgbMin:with:
"29" rgbMinInvert:with:
"30" alphaBlendConst:with:
"31" alphaPaintConst:with:
"32" rgbDiff:with:
"33" tallyIntoMap:with:
"34" alphaBlendScaled:with:
"35" alphaBlendScaled:with: "unused here - only used by FXBlt"
"36" alphaBlendScaled:with: "unused here - only used by FXBlt"
"37" rgbMul:with:
"38" pixSwap:with:
"39" pixClear:with:
"40" fixAlpha:with:
"41" rgbComponentAlpha:with:
).
OpTableSize := OpTable size + 1. "0-origin indexing"
]
{ #category : #translation }
BitBltSimulation class >> moduleName [
^'BitBltPlugin'
]
{ #category : #translation }
BitBltSimulation class >> opTable [
^ OpTable
]
{ #category : #translation }
BitBltSimulation class >> requiredMethodNames: options [
^self opTable asSet
]
{ #category : #'system simulation' }
BitBltSimulation class >> simulatorClass [
^BitBltSimulator
]
{ #category : #testing }
BitBltSimulation class >> test2 [
"BitBltSimulation test2"
| f |
Display fillWhite: (0 @ 0 extent: 300 @ 140).
1 to: 12 do: [:i |
f := (Form extent: i @ 5) fillBlack.
0 to: 20 do: [:x | f displayOn: Display at: x * 13 @ (i * 10)]]
]
{ #category : #testing }
BitBltSimulation class >> timingTest: extent [
"BitBltSimulation timingTest: 640@480"
| f f2 map |
f := Form extent: extent depth: 8.
f2 := Form extent: extent depth: 8.
map := Bitmap new: 1 << f2 depth.
^ Array
with: (Time millisecondsToRun: [100 timesRepeat: [f fillWithColor: Color white]])
with: (Time millisecondsToRun: [100 timesRepeat: [f copy: f boundingBox from: 0 @ 0 in: f2 rule: Form over]])
with: (Time millisecondsToRun: [100 timesRepeat: [f copyBits: f boundingBox from: f2 at: 0 @ 0 colorMap: map]])
]
{ #category : #'system simulation' }
BitBltSimulation class >> warpBitsFrom: aBitBlt [
"Simulate the warpBits primitive"
| proxy bb |
proxy := InterpreterProxy new.
proxy loadStackFrom: thisContext sender home.
bb := self simulatorClass new.
bb initialiseModule.
bb setInterpreter: proxy.
proxy success: (bb loadWarpBltFrom: aBitBlt).
bb warpBits.
proxy failed ifFalse:[
proxy showDisplayBits: aBitBlt destForm Left: bb affectedLeft Top: bb affectedTop Right: bb affectedRight Bottom: bb affectedBottom].
^proxy stackValue: 0
]
{ #category : #'combination rules' }
BitBltSimulation >> OLDrgbDiff: sourceWord with: destinationWord [
"Subract the pixels in the source and destination, color by color,
and return the sum of the absolute value of all the differences.
For non-rgb, XOR the two and return the number of differing pixels.
Note that the region is not clipped to bit boundaries, but only to the
nearest (enclosing) word. This is because copyLoop does not do
pre-merge masking. For accurate results, you must subtract the
values obtained from the left and right fringes."
| diff pixMask |
<inline: false>
destDepth < 16 ifTrue:
["Just xor and count differing bits if not RGB"
diff := sourceWord bitXor: destinationWord.
pixMask := maskTable at: destDepth.
[diff = 0] whileFalse:
[(diff bitAnd: pixMask) ~= 0 ifTrue: [bitCount := bitCount + 1].
diff := diff >> destDepth].
^ destinationWord "for no effect"].
destDepth = 16
ifTrue:
[diff := (self partitionedSub: sourceWord from: destinationWord
nBits: 5 nPartitions: 3).
bitCount := bitCount + (diff bitAnd: 16r1F)
+ (diff>>5 bitAnd: 16r1F)
+ (diff>>10 bitAnd: 16r1F).
diff := (self partitionedSub: sourceWord>>16 from: destinationWord>>16
nBits: 5 nPartitions: 3).
bitCount := bitCount + (diff bitAnd: 16r1F)
+ (diff>>5 bitAnd: 16r1F)
+ (diff>>10 bitAnd: 16r1F)]
ifFalse:
[diff := (self partitionedSub: sourceWord from: destinationWord
nBits: 8 nPartitions: 3).
bitCount := bitCount + (diff bitAnd: 16rFF)
+ (diff>>8 bitAnd: 16rFF)
+ (diff>>16 bitAnd: 16rFF)].
^ destinationWord "For no effect on dest"
]
{ #category : #'combination rules' }
BitBltSimulation >> OLDtallyIntoMap: sourceWord with: destinationWord [
"Tally pixels into the color map. Note that the source should be
specified = destination, in order for the proper color map checks
to be performed at setup.
Note that the region is not clipped to bit boundaries, but only to the
nearest (enclosing) word. This is because copyLoop does not do
pre-merge masking. For accurate results, you must subtract the
values obtained from the left and right fringes."
| mapIndex pixMask shiftWord |
(cmFlags bitAnd: (ColorMapPresent bitOr: ColorMapIndexedPart)) =
(ColorMapPresent bitOr: ColorMapIndexedPart)
ifFalse: [^ destinationWord "no op"].
destDepth < 16 ifTrue:
["loop through all packed pixels."
pixMask := (maskTable at: destDepth) bitAnd: cmMask.
shiftWord := destinationWord.
1 to: destPPW do:
[:i |
mapIndex := shiftWord bitAnd: pixMask.
self tallyMapAt: mapIndex put: (self tallyMapAt: mapIndex) + 1.
shiftWord := shiftWord >> destDepth].
^ destinationWord].
destDepth = 16 ifTrue:
["Two pixels Tally the right half..."
mapIndex := self rgbMap: (destinationWord bitAnd: 16rFFFF) from: 5 to: cmBitsPerColor.
self tallyMapAt: mapIndex put: (self tallyMapAt: mapIndex) + 1.
"... and then left half"
mapIndex := self rgbMap: destinationWord>>16 from: 5 to: cmBitsPerColor.
self tallyMapAt: mapIndex put: (self tallyMapAt: mapIndex) + 1]
ifFalse:
["Just one pixel."
mapIndex := self rgbMap: destinationWord from: 8 to: cmBitsPerColor.
self tallyMapAt: mapIndex put: (self tallyMapAt: mapIndex) + 1].
^ destinationWord "For no effect on dest"
]
{ #category : #'combination rules' }
BitBltSimulation >> addWord: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord + destinationWord
]
{ #category : #accessing }
BitBltSimulation >> affectedBottom [
^affectedB
]
{ #category : #accessing }
BitBltSimulation >> affectedLeft [
^affectedL
]
{ #category : #accessing }
BitBltSimulation >> affectedRight [
^affectedR
]
{ #category : #accessing }
BitBltSimulation >> affectedTop [
^affectedT
]
{ #category : #'combination rules' }
BitBltSimulation >> alphaBlend: sourceWord with: destinationWord [
"Blend sourceWord with destinationWord, assuming both are 32-bit pixels.
The source is assumed to have 255*alpha in the high 8 bits of each pixel,
while the high 8 bits of the destinationWord will be ignored.
The blend produced is alpha*source + (1-alpha)*dest, with
the computation being performed independently on each color
component. The high byte of the result will be 0."
| alpha unAlpha result blendRB blendAG |
<inline: false>
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
<var: #blendRB type: 'unsigned int'>
<var: #blendAG type: 'unsigned int'>
<var: #result type: 'unsigned int'>
<var: #alpha type: 'unsigned int'>
<var: #unAlpha type: 'unsigned int'>
alpha := sourceWord >> 24. "High 8 bits of source pixel"
alpha = 0 ifTrue: [ ^ destinationWord ].
alpha = 255 ifTrue: [ ^ sourceWord ].
unAlpha := 255 - alpha.
blendRB := ((sourceWord bitAnd: 16rFF00FF) * alpha) +
((destinationWord bitAnd: 16rFF00FF) * unAlpha)
+ 16rFF00FF. "blend red and blue"
blendAG := (((sourceWord>> 8 bitOr: 16rFF0000) bitAnd: 16rFF00FF) * alpha) +
((destinationWord>>8 bitAnd: 16rFF00FF) * unAlpha)
+ 16rFF00FF. "blend alpha and green"
blendRB := blendRB + (blendRB - 16r10001 >> 8 bitAnd: 16rFF00FF) >> 8 bitAnd: 16rFF00FF. "divide by 255"
blendAG := blendAG + (blendAG - 16r10001 >> 8 bitAnd: 16rFF00FF) >> 8 bitAnd: 16rFF00FF.
result := blendRB bitOr: blendAG<<8.
^ result
]
{ #category : #'combination rules' }
BitBltSimulation >> alphaBlendConst: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^ self alphaBlendConst: sourceWord with: destinationWord paintMode: false
]
{ #category : #'combination rules' }
BitBltSimulation >> alphaBlendConst: sourceWord with: destinationWord paintMode: paintMode [
"Blend sourceWord with destinationWord using a constant alpha.
Alpha is encoded as 0 meaning 0.0, and 255 meaning 1.0.
The blend produced is alpha*source + (1.0-alpha)*dest, with the
computation being performed independently on each color component.
This function could eventually blend into any depth destination,
using the same color averaging and mapping as warpBlt.
paintMode = true means do nothing if the source pixel value is zero."
"This first implementation works with dest depths of 16 and 32 bits only.
Normal color mapping will allow sources of lower depths in this case,
and results can be mapped directly by truncation, so no extra color maps are needed.
To allow storing into any depth will require subsequent addition of two other
colormaps, as is the case with WarpBlt."
| pixMask destShifted sourceShifted destPixVal rgbMask sourcePixVal unAlpha result pixBlend shift blend maskShifted bitsPerColor blendAG blendRB |
<inline: false>
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
<var: #blendRB type: 'unsigned int'>
<var: #blendAG type: 'unsigned int'>
<var: #result type: 'unsigned int'>
<var: #sourceAlpha type: 'unsigned int'>
<var: #unAlpha type: 'unsigned int'>
<var: #sourceShifted type: 'unsigned int'>
<var: #destShifted type: 'unsigned int'>
<var: #maskShifted type: 'unsigned int'>
<var: #pixMask type: 'unsigned int'>
<var: #rgbMask type: 'unsigned int'>
<var: #pixBlend type: 'unsigned int'>
<var: #blend type: 'unsigned int'>
destDepth < 16 ifTrue: [^ destinationWord "no-op"].
unAlpha := 255 - sourceAlpha.
result := destinationWord.
destPPW = 1 ifTrue:["32bpp blends include alpha"
paintMode & (sourceWord = 0) "painting a transparent pixel" ifFalse:[
blendRB := ((sourceWord bitAnd: 16rFF00FF) * sourceAlpha) +
((destinationWord bitAnd: 16rFF00FF) * unAlpha) + 16rFF00FF. "blendRB red and blue"
blendAG := ((sourceWord>> 8 bitAnd: 16rFF00FF) * sourceAlpha) +
((destinationWord>>8 bitAnd: 16rFF00FF) * unAlpha) + 16rFF00FF. "blendRB alpha and green"
blendRB := blendRB + (blendRB - 16r10001 >> 8 bitAnd: 16rFF00FF) >> 8 bitAnd: 16rFF00FF. "divide by 255"
blendAG := blendAG + (blendAG - 16r10001 >> 8 bitAnd: 16rFF00FF) >> 8 bitAnd: 16rFF00FF.
result := blendRB bitOr: blendAG<<8.
].
] ifFalse:[
pixMask := maskTable at: destDepth.
bitsPerColor := 5.
rgbMask := 16r1F.
maskShifted := destMask.
destShifted := destinationWord.
sourceShifted := sourceWord.
1 to: destPPW do:[:j |
sourcePixVal := sourceShifted bitAnd: pixMask.
((maskShifted bitAnd: pixMask) = 0 "no effect if outside of dest rectangle"
or: [paintMode & (sourcePixVal = 0) "or painting a transparent pixel"])
ifFalse:
[destPixVal := destShifted bitAnd: pixMask.
pixBlend := 0.
1 to: 3 do:
[:i | shift := (i-1)*bitsPerColor.
blend := (((sourcePixVal>>shift bitAnd: rgbMask) * sourceAlpha)
+ ((destPixVal>>shift bitAnd: rgbMask) * unAlpha))
+ 254 // 255 bitAnd: rgbMask.
pixBlend := pixBlend bitOr: blend<<shift].
result := (result bitAnd: (pixMask << (j-1*16)) bitInvert32)
bitOr: pixBlend << (j-1*16)].
maskShifted := maskShifted >> destDepth.
sourceShifted := sourceShifted >> destDepth.
destShifted := destShifted >> destDepth].
].
^ result
]
{ #category : #'combination rules' }
BitBltSimulation >> alphaBlendScaled: sourceWord with: destinationWord [
"Blend sourceWord with destinationWord using the alpha value from sourceWord.
Alpha is encoded as 0 meaning 0.0, and 255 meaning 1.0.
In contrast to alphaBlend:with: the color produced is
srcColor + (1-srcAlpha) * dstColor
e.g., it is assumed that the source color is already scaled."
| unAlpha rb ag |
<inline: false> "Do NOT inline this into optimized loops"
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
<var: #rb type: 'unsigned int'>
<var: #ag type: 'unsigned int'>
<var: #unAlpha type: 'unsigned int'>
unAlpha := 255 - (sourceWord >> 24). "High 8 bits of source pixel is source opacity (ARGB format)"
rb := ((destinationWord bitAnd: 16rFF00FF) * unAlpha >> 8 bitAnd: 16rFF00FF) + (sourceWord bitAnd: 16rFF00FF). "blend red and blue components"
ag := ((destinationWord>>8 bitAnd: 16rFF00FF) * unAlpha >> 8 bitAnd: 16rFF00FF) + (sourceWord>>8 bitAnd: 16rFF00FF). "blend alpha and green components"
rb := (rb bitAnd: 16rFF00FF) bitOr: (rb bitAnd: 16r1000100) * 16rFF >> 8. "saturate red and blue components if there is a carry"
ag := (ag bitAnd: 16rFF00FF) << 8 bitOr: (ag bitAnd: 16r1000100) * 16rFF. "saturate alpha and green components if there is a carry"
^ag bitOr: rb "recompose"
]
{ #category : #'combination rules' }
BitBltSimulation >> alphaPaintConst: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
sourceWord = 0 ifTrue: [^ destinationWord "opt for all-transparent source"].
^ self alphaBlendConst: sourceWord with: destinationWord paintMode: true
]
{ #category : #'inner loop' }
BitBltSimulation >> alphaSourceBlendBits16 [
"This version assumes
combinationRule = 34
sourcePixSize = 32
destPixSize = 16
sourceForm ~= destForm.
"
| srcIndex dstIndex sourceWord srcAlpha destWord deltaX deltaY
srcY dstY dstMask srcShift ditherBase ditherIndex ditherThreshold |
<inline: false> "This particular method should be optimized in itself"
<var: #sourceWord type: #'unsigned int'>
<var: #destWord type: #'unsigned int'>
<var: #dstMask type: #'unsigned int'>
deltaY := bbH + 1. "So we can pre-decrement"
srcY := sy.
dstY := dy.
srcShift := (dx bitAnd: 1) * 16.
destMSB ifTrue:[srcShift := 16 - srcShift].
mask1 := 16rFFFF << (16 - srcShift).
"This is the outer loop"
[(deltaY := deltaY - 1) ~= 0] whileTrue:[
srcIndex := sourceBits + (srcY * sourcePitch) + (sx * 4).
dstIndex := destBits + (dstY * destPitch) + (dx // 2 * 4).
ditherBase := (dstY bitAnd: 3) * 4.
ditherIndex := (sx bitAnd: 3) - 1. "For pre-increment"
deltaX := bbW + 1. "So we can pre-decrement"
dstMask := mask1.
dstMask = 16rFFFF ifTrue:[srcShift := 16] ifFalse:[srcShift := 0].
"This is the inner loop"
[(deltaX := deltaX - 1) ~= 0] whileTrue:[
ditherThreshold := ditherMatrix4x4 at: ditherBase + (ditherIndex := ditherIndex + 1 bitAnd: 3).
sourceWord := self srcLongAt: srcIndex.
srcAlpha := sourceWord >> 24.
srcAlpha = 255 ifTrue:[
"Dither from 32 to 16 bit"
sourceWord := self dither32To16: sourceWord threshold: ditherThreshold.
sourceWord = 0
ifTrue:[sourceWord := 1 << srcShift]
ifFalse: [sourceWord := sourceWord << srcShift].
"Store masked value"
self dstLongAt: dstIndex put: sourceWord mask: dstMask.
] ifFalse:[ "srcAlpha ~= 255"
srcAlpha = 0 ifFalse:[ "0 < srcAlpha < 255"
"If we have to mix colors then just copy a single word"
destWord := self dstLongAt: dstIndex.
destWord := destWord bitAnd: dstMask bitInvert32.
destWord := destWord >> srcShift.
"Expand from 16 to 32 bit by adding zero bits"
destWord := (((destWord bitAnd: 16r7C00) bitShift: 9) bitOr:
((destWord bitAnd: 16r3E0) bitShift: 6)) bitOr:
(((destWord bitAnd: 16r1F) bitShift: 3) bitOr:
16rFF000000).
"Mix colors"
sourceWord := self alphaBlendScaled: sourceWord with: destWord.
"And dither"
sourceWord := self dither32To16: sourceWord threshold: ditherThreshold.
sourceWord = 0
ifTrue:[sourceWord := 1 << srcShift]
ifFalse:[sourceWord := sourceWord << srcShift].
"Store back"
self dstLongAt: dstIndex put: sourceWord mask: dstMask.
].
].
srcIndex := srcIndex + 4.
destMSB
ifTrue:[srcShift = 0 ifTrue:[dstIndex := dstIndex + 4]]
ifFalse:[srcShift = 0 ifFalse:[dstIndex := dstIndex + 4]].
srcShift := srcShift bitXor: 16. "Toggle between 0 and 16"
dstMask := dstMask bitInvert32. "Mask other half word"
].
srcY := srcY + 1.
dstY := dstY + 1.
].
]
{ #category : #'inner loop' }
BitBltSimulation >> alphaSourceBlendBits32 [
"This version assumes
combinationRule = 34
sourcePixSize = destPixSize = 32
sourceForm ~= destForm.
Note: The inner loop has been optimized for dealing
with the special cases of srcAlpha = 0.0 and srcAlpha = 1.0
"
| srcIndex dstIndex sourceWord srcAlpha destWord deltaX deltaY srcY dstY |
<inline: false> "This particular method should be optimized in itself"
<var: #sourceWord type: #'unsigned int'>
<var: #destWord type: #'unsigned int'>
"Give the compile a couple of hints"
"The following should be declared as pointers so the compiler will
notice that they're used for accessing memory locations
(good to know on an Intel architecture) but then the increments
would be different between ST code and C code so must hope the
compiler notices what happens (MS Visual C does)"
deltaY := bbH + 1. "So we can pre-decrement"
srcY := sy.
dstY := dy.
"This is the outer loop"
[(deltaY := deltaY - 1) ~= 0] whileTrue:[
srcIndex := sourceBits + (srcY * sourcePitch) + (sx * 4).
dstIndex := destBits + (dstY * destPitch) + (dx * 4).
deltaX := bbW + 1. "So we can pre-decrement"
"This is the inner loop"
[(deltaX := deltaX - 1) ~= 0] whileTrue:[
sourceWord := self srcLongAt: srcIndex.
srcAlpha := sourceWord >> 24.
srcAlpha = 255 ifTrue:[
self dstLongAt: dstIndex put: sourceWord.
srcIndex := srcIndex + 4.
dstIndex := dstIndex + 4.
"Now copy as many words as possible with alpha = 255"
[(deltaX := deltaX - 1) ~= 0 and:[
(sourceWord := self srcLongAt: srcIndex) >> 24 = 255]]
whileTrue:[
self dstLongAt: dstIndex put: sourceWord.
srcIndex := srcIndex + 4.
dstIndex := dstIndex + 4.
].
"Adjust deltaX"
deltaX := deltaX + 1.
] ifFalse:[ "srcAlpha ~= 255"
srcAlpha = 0 ifTrue:[
srcIndex := srcIndex + 4.
dstIndex := dstIndex + 4.
"Now skip as many words as possible,"
[(deltaX := deltaX - 1) ~= 0 and:[
(sourceWord := self srcLongAt: srcIndex) >> 24 = 0]]
whileTrue:[
srcIndex := srcIndex + 4.
dstIndex := dstIndex + 4.
].
"Adjust deltaX"
deltaX := deltaX + 1.
] ifFalse:[ "0 < srcAlpha < 255"
"If we have to mix colors then just copy a single word"
destWord := self dstLongAt: dstIndex.
destWord := self alphaBlendScaled: sourceWord with: destWord.
self dstLongAt: dstIndex put: destWord.
srcIndex := srcIndex + 4.
dstIndex := dstIndex + 4.
].
].
].
srcY := srcY + 1.
dstY := dstY + 1.
].
]
{ #category : #'inner loop' }
BitBltSimulation >> alphaSourceBlendBits8 [
"This version assumes
combinationRule = 34
sourcePixSize = 32
destPixSize = 8
sourceForm ~= destForm.
Note: This is not real blending since we don't have the source colors available.
"
| srcIndex dstIndex sourceWord srcAlpha destWord deltaX deltaY
srcY dstY dstMask srcShift adjust mappingTable mapperFlags |
<inline: false>
<var: #mappingTable type:'unsigned int *'>
<var: #sourceWord type: #'unsigned int'>
<var: #destWord type: #'unsigned int'>
<var: #dstMask type: #'unsigned int'>
mappingTable := self default8To32Table.
mapperFlags := cmFlags bitAnd: ColorMapNewStyle bitInvert32.
deltaY := bbH + 1. "So we can pre-decrement"
srcY := sy.
dstY := dy.
mask1 := ((dx bitAnd: 3) * 8).
destMSB ifTrue:[mask1 := 24 - mask1].
mask2 := AllOnes bitXor:(16rFF << mask1).
(dx bitAnd: 1) = 0
ifTrue:[adjust := 0]
ifFalse:[adjust := 16r1F1F1F1F].
(dy bitAnd: 1) = 0
ifTrue:[adjust := adjust bitXor: 16r1F1F1F1F].
"This is the outer loop"
[(deltaY := deltaY - 1) ~= 0] whileTrue:[
adjust := adjust bitXor: 16r1F1F1F1F.
srcIndex := sourceBits + (srcY * sourcePitch) + (sx * 4).
dstIndex := destBits + (dstY * destPitch) + (dx // 4 * 4).
deltaX := bbW + 1. "So we can pre-decrement"
srcShift := mask1.
dstMask := mask2.
"This is the inner loop"
[(deltaX := deltaX - 1) ~= 0] whileTrue:[
sourceWord := ((self srcLongAt: srcIndex) bitAnd: (adjust bitInvert32)) + adjust.
srcAlpha := sourceWord >> 24.
srcAlpha > 31 ifTrue:["Everything below 31 is transparent"
srcAlpha < 224 ifTrue:["Everything above 224 is opaque"
destWord := self dstLongAt: dstIndex.
destWord := destWord bitAnd: dstMask bitInvert32.
destWord := destWord >> srcShift.
destWord := mappingTable at: destWord.
sourceWord := self alphaBlendScaled: sourceWord with: destWord.
].
sourceWord := self mapPixel: sourceWord flags: mapperFlags.
sourceWord := sourceWord << srcShift.
"Store back"
self dstLongAt: dstIndex put: sourceWord mask: dstMask.
].
srcIndex := srcIndex + 4.
destMSB ifTrue:[
srcShift = 0
ifTrue:[dstIndex := dstIndex + 4.
srcShift := 24.
dstMask := 16r00FFFFFF]
ifFalse:[srcShift := srcShift - 8.
dstMask := (dstMask >> 8) bitOr: 16rFF000000].
] ifFalse:[
srcShift = 24
ifTrue:[dstIndex := dstIndex + 4.
srcShift := 0.
dstMask := 16rFFFFFF00]
ifFalse:[srcShift := srcShift + 8.
dstMask := dstMask << 8 bitOr: 255].
].
adjust := adjust bitXor: 16r1F1F1F1F.
].
srcY := srcY + 1.
dstY := dstY + 1.
].
]
{ #category : #'combination rules' }
BitBltSimulation >> bitAnd: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitAnd: destinationWord
]
{ #category : #'combination rules' }
BitBltSimulation >> bitAndInvert: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitAnd: destinationWord bitInvert32
]
{ #category : #'combination rules' }
BitBltSimulation >> bitInvertAnd: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitInvert32 bitAnd: destinationWord
]
{ #category : #'combination rules' }
BitBltSimulation >> bitInvertAndInvert: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitInvert32 bitAnd: destinationWord bitInvert32
]
{ #category : #'combination rules' }
BitBltSimulation >> bitInvertDestination: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^destinationWord bitInvert32
]
{ #category : #'combination rules' }
BitBltSimulation >> bitInvertOr: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitInvert32 bitOr: destinationWord
]
{ #category : #'combination rules' }
BitBltSimulation >> bitInvertOrInvert: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitInvert32 bitOr: destinationWord bitInvert32
]
{ #category : #'combination rules' }
BitBltSimulation >> bitInvertSource: sourceWord with: destinationWord [
<returnTypeC: 'unsigned int'>
<var: #sourceWord type: 'unsigned int'>
<var: #destinationWord type: 'unsigned int'>
^sourceWord bitInvert32
]