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Chapter21-ImageDisplayFunctions
Syntax
int SNBDAPI RemoveScrollbars(Control *panel);
Remark
Table21.16:RemoveScrollbarsVariables
Variable
Description
panel
Standard.NETcontrol
Returns
Returnsthestandard.NETcontrol.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
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Chapter22-ImageDisplayOptionFunctions
Chapter 22 - Image Display Option
Functions
ThischapterdescribestheRasterMaster.NETimagedisplayoptionfunctions.
CIMG_animate()
ThisfunctiondrawsallframesoftheanimatedGIFfilepassedinasbm_nameonce.Callthis
functionrepetitivelyforcontinuousdisplay.
Usethedelaytimeintheimageforproperframesynchronization.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
ThisfunctionisusedintheAnimate
sample.
Syntax
int SNBDAPI CIMG_animate(Graphics *g, String *bm_name, int xs, int
ys, int xsize, int ysize);
Remark
Table22.1:CIMG_animateFunctionVariables
Variable
Description
g
Graphicsobject
bm_name
AnimatedGIFfilenametouse
xs
Startingxpositiontodraw
ys
Startingypositiontodraw
xsize
Xsizeofimagedrawingrectangle
ysize
Ysizeofimagedrawingrectangle
Returns
Returnsthestatusoftheanimateoperation.AnyvaluelessthanzeroisaSnowbounderror
code.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMG_bitmap_palette()
Thisfunctionloadsthepalettefromtheimageintothevideoadapter’slut.4and8-bitimages
havepalettesassociatedwiththem.Forbestdisplayquality,thevideoadapter’slutorvideo
dacmustbeloadedwiththispalette.
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Chapter22-ImageDisplayOptionFunctions
Fora24-bitimagedisplayingona256-coloradapter,itloadsaspecialrainbowpalettewhich
thelibrarycreatesinternally.For1-bitimageswithaliasingsettoSCALE_TO_GRAY,itloadsa
256grayscalepalette.
Syntax
int SNBDAPI CIMG_bitmap_palette(Graphics *g);
Remark
Table22.2:CIMG_bitmap_paletteFunctionVariable
Variable
Description
g
Graphicsobject
Returns
Returnsthestatusofthebitmappaletteoperation.AnyvaluelessthanzeroisaSnowbound
errorcode.SeeAppendix
H
-
Error
Codes
foralistoferrorcodes.
CIMG_display_ddb_effect()
Thisfunctiondisplaystheimagewiththedesiredeffect.Thesedisplayeffectsarealsoreferred
toaswipes.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
ThisfunctionisusedintheDDB
Effect
sample.
Syntax
int SNBDAPI CIMG_display_ddb_effect(Graphics *g, int xpos, int
ypos, int width, int height, int effect);
Remark
Table22.3:CIMG_display_ddb_effectFunctionVariables
Variable
Description
g
Graphicsobject
xpos
StartingXcoordinatefordisplayofimage
ypos
StartingYcoordinatefordisplayofimage
width
Widthofdesiredimagetodisplay
height
Heightofdesiredimagetodisplay
effect
Displaythefollowingeffect:
1-(Default)Displaysimagewithnoimageeffects
2-Displaysimagefromthebottomtothetopofthe
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Chapter22-ImageDisplayOptionFunctions
Variable
Description
Window
3-DisplaysimageintheWindowfromtherighttotheleft
sideinverticallines
4-DisplaysimageintheWindowfromthelefttotheright
sideusingverticallines
5-DisplaysimageintheWindowinawindowhorizontal
blindfashion
6-DisplaysimageintheWindowasstaggeredblocks
7-DisplaysimageintheWindowasblocksfromthe
centeroftheWindow
8-DisplaysimageintheWindowinawindowvertical
blindfashion
9-DisplaysimageintheWindowassmallblocksfrom
thecenteroftheWindow
10-DisplaysimageintheWindowasblocksinazigzag
pattern
Returns
Returnsthestandardlibraryimagehandle.AnyvaluelessthanzeroisaSnowbounderrorcode.
SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMG_set_gamma()
Thisfunctioncorrectsforthegammaorresponsecurveofthemonitor.Thedefaultis100.This
drasticallyimprovesthequalityofgrayscaleor24-bitimages.
Syntax
int SNBDAPI CIMG_set_gamma(int gamma);
Remark
Table22.4:CIMG_set_gammaFunctionVariable
Variable
Description
gamma
Integerrangingfrom0to200
Returns
Returnsthestatusofthesetgammaoperation.Avalueof0indicatessuccess.Anyvalueless
thanzeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistof
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Chapter22-ImageDisplayOptionFunctions
errorcodes.
CIMG_set_lut()
Thisfunctionchangesthecontrastorbrightnessoftheimage.Positivevaluesaddcontrastor
brightnesstotheimagewhilenegativevaluesdarkenordecreasethecontrastoftheimage.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
ThisfunctionisusedintheContrast
sample.
Syntax
int SNBDAPI CIMG_set_lut(int contrast, int brightness);
Remark
Table22.5:CIMG_set_lutFunctionVariables
Variable
Description
contrast
Integervaluefrom-127to127
brightness
Integervaluefrom-127to127
Returns
Returnsthestatusofthesetlookuptableoperation.Avalueof0indicatessuccess.Anyvalue
lessthanzeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralist
oferrorcodes.
CIMG_window_level()
Thisfunctionturnswindow-levelingonorofffor16or8-bitgrayscaleimages.Window-leveling
remapspixelvaluestoincreaseordecreasethedynamicrangeofgrayvalues.
Manymedicalimageshavebeencreatedtouseonlyaportionofthetotalrangeofgrayvalues
possible.Theyappearverydarkorwashedoutandneedcontrastenhancementorwindow
leveling.Thisistypical.Thewindow-levelingfunctionimprovesthecontrasttoallowmore
detailstobepresentintheimageatdisplaytime.Anormal16bitimagethatdoesnotneed
windowlevelingshouldbedisplaycorrectly.
Iftheminandmaxvaluesaresetto0,thefunctionautomaticallycalculatesthebestvaluesfor
minandmax.Theimagedataisneverchangedsincethepixelremappingisdoneatdisplay
time.
Syntax
int SNBDAPI CIMG_window_level(int min_gray_value, int max_gray_
value, int on_off);
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Chapter22-ImageDisplayOptionFunctions
Remark
Table22.6:CIMG_window_levelFunctionVariables
Variable
Description
min_gray_value
Startingpixelgrayvalue
max_gray_value
Endingpixelgrayvalue
on_off
TurnWindowslevelingonoroff
0=Off
1=On
Returns
Returnsthestatusofthesetwindowleveloperation.Avalueof0indicatessuccess.Anyvalue
lessthanzeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralist
oferrorcodes.
CIMGLOW_autocolor()
Thisglobalfunctiondisplaysmultiplepaletteimagesatthesametime.Asinglerainbowpalette
createdbythelibraryisrealizedwhenCIMG_bitmap_palette()iscalledforanypalette
image.SeeCIMG_
bitmap_
palette
()
formoreinformation.
Thisforcesthelibrarytoditherall8-bitimagestothispaletteforbestdisplayqualitywhenusing
multiplepaletteimages.
Syntax
int SNBDAPI CIMGLOW_autocolor(int color);
Remark
Table22.7:CIMGLOW_autocolorFunctionVariable
Variable
Description
color
Backgroundcolortoset
Returns
Returnsthemultiplepaletteimages.AnyvaluelessthanzeroisaSnowbounderrorcode.See
Appendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
**GLOBALFUNCTION**
136
Chapter22-ImageDisplayOptionFunctions
CIMGLOW_set_alias()
Thisfunctionsetsthealiasingfactorforthespecifiedimage.Itisusedtoturnaliasingonoroff
foraspecificimagewhenoneormoreimagesareloadedinmemory.
YoucanfindthesamplesforusingthisfunctioninthefollowingdirectoryC:\Program
Files\Snowbound Software\RasterMaster® .NET Evaluation\Net\Samples.
Thisfunctionisusedinthefollowingsamples:
l
Page
l
Thumbnail
l
Web
Image
Viewer
Component
Syntax
int SNBDAPI CIMGLOW_set_alias(int alias);
Remark
Table22.8:CIMGLOW_set_alias_imgFunctionVariable
Variable
Description
alias
Setsthealiasingfactor.Choosefrom:
0=Noaliasing
1=Usethepreserveblackalgorithm
2=Usethescaletograyalgorithm
3=Usethescaletocoloralgorithm
4=Aliasall.Usescaletograyandscaletocolor
Returns
Returnsthestatusofthealiasingfactor.AnyvaluelessthanzeroisaSnowbounderrorcode.
SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMGLOW_set_alias_quality()
Thisfunctionsetstheeffectivenessofscaletograyandpreserveblackalgorithms.This
functionworkswhenusingCIMGLOW_set_alias().Avalueof100ensuresthatnoblack
pixelswillbediscardedwhendisplayingtheimage.SeeCIMGLOW_
set_
alias
()
formore
information.
Syntax
int SNBDAPI CIMGLOW_set_alias_quality(int alias_quality);
137
Chapter22-ImageDisplayOptionFunctions
Remark
Table22.9:CIMGLOW_set_alias_qualityFunctionVariable
Variable
Description
alias_quality
AliasQuality;0to100
0=Discardblackpixels
100=Donotdiscardanyblackpixels
Returns
Returnsthestandardlibraryimagehandle.AnyvaluelessthanzeroisaSnowbounderrorcode.
SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
CIMGLOW_set_dithermode()
Thisglobalfunctiondithers24-bitimagestoa256-colordisplay.Also8and24-bitimagesare
ditheredon16-colordisplayadapters.
IfthedisplayissettoDITHER_NONE,youareatthemercyofthedisplaydriver.Forinstance,
24-bitimagesona256colordisplayadaptercantake2ormoreminutestodisplaywithdither
modeoff.
Syntax
int SNBDAPI CIMGLOW_set_dithermode(int mode);
Remark
Table22.10:CIMGLOW_set_dithermodeFunctionVariable
Variable
Description
mode
Usetheabovevaluestodecidehoworhownottodither.
Thedefaultis-1.
Returns
Returnsthestatusofthesetdithermodereductionoperation.Avalueof0indicatessuccess.
AnyvaluelessthanzeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
foralistoferrorcodes.
ScreenDisplayDitherModeConstants
Example22.1CIMGLOW_set_dithermode
DITHER_NONE 0 /* Allows for Windows to do the color reduction.
This is not recommended, but available. */
138
Chapter22-ImageDisplayOptionFunctions
DITHER_BAYER 1 /* Uses the Bayer dithering algorithm for color
reduction. */
DITHER_DIFFUSION 2 /* Use error diffusion for color reduction.
*/
**GLOBALFUNCTION**
CIMGLOW_set_imnet_page_size()
ThisfunctionallowsyoutosetthedocumentsizefortheIMNETformat.
Note:
Thedefaultvalueis200fortheDPIand0forthewidthandheight.
Syntax
int SNBDAPI CIMGLOW_imnet_page_size(int iWidth, int iHeight, int
iDPI);
Remark
Table22.11:CIMGLOW_set_imnet_page_sizeFunctionVariables
Variable
Description
iWidth
Setsthedocument’swidth
iHeight
Setsthedocument’sheight
iDPI
Setsthedocumentindotsperinch(DPI)
Returns
ReturnsthestatusofthesetIMNETpagesizeoperation.Avalueof0indicatessuccess.Any
valuelessthanzeroisaSnowbounderrorcode.SeeAppendix
H,
Snowbound
Error
Codes
for
alistoferrorcodes.
CIMGLOW_set_rop()
ThisfunctionallowsimagestobedisplayedonthescreenusingANDing,ORingoranyother
legalWindowsopcode.
Syntax
int SNBDAPI CIMGLOW_set_rop(int raster_operation);
139
Chapter22-ImageDisplayOptionFunctions
Remark
Table22.12:CIMGLOW_set_ropFunctionVariables
Variable
Description
raster_operation
Booleanopcodetousewhendisplayingtheimage.Seethelist
belowfortheavailableopcodesorconsultyourWindowsSDK
manual.
SRCCOPY=Copiesthesourcebitmaptothedestinationbitmap.
SRCPAINT=Combinespixelsofthedestinationandsource
bitmapsusingtheBooleanORoperator.
SRCAND=Combinespixelsofthedestinationandsource
bitmapsusingtheBooleanANDoperator.
SRCINVERT=Combinespixelsofthedestinationandsource
bitmapsusingtheBooleanXORoperator.
SRCERASE=Invertsthedestinationbitmapandcombinesthe
resultwiththesourcebitmapusingtheBooleanANDoperator.
NOTSRCCOPY=Copiestheinvertedsourcebitmaptothe
destination.
NOTSRCERASE=Invertstheresultofcombiningthedestination
andsourcebitmapsusingtheBooleanORoperator.
MERGECOPY=Combinesthepatternandthesourcebitmap
usingtheBooleanANDoperator.
MERGEPAINT=Combinestheinvertedsourcebitmapwiththe
destinationbitmapusingtheBooleanORoperator.
PATCOPY=Copiesthepatterntothedestinationbitmap.
PATPAINT=Combinestheinvertedsourcebitmapwiththe
patternusingtheBooleanXORoperator.Combinestheresultof
thisoperationwiththedestinationbitmapusingtheBooleanOR
operator.
PATINVERT=Combinesthedestinationbitmapwiththepattern
usingtheBooleanXORoperator.Combinesthedestinationbitmap
withthepatternusingtheBooleanXORoperator.
DSTINVERT-Invertsthedestinationbitmap.
BLACKNESS-Turnsalloutputblack.
WHITENESS-Turnsalloutputwhite.
140
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