Optimizing Start/Stopdrawing?
Posted: Sat Mar 02, 2024 10:42 am
I need to get characters ('0'...'9') into a matrix representing the gray values of the pixels, where all characters have to be set to a fixed size.
I did the job by finding the position and size of each character, then I find the minimum box outlining all characters, crop the bitmaps and calculate the matrix values.
Everything works fine but it would be fine to do some tuning (speed up, reducing memory, etc.).
For instance, how to get rid of the sequence StopVectorDrawing() / GrabImage(11...) / StartVectorDrawing(...) ?
I did the job by finding the position and size of each character, then I find the minimum box outlining all characters, crop the bitmaps and calculate the matrix values.
Everything works fine but it would be fine to do some tuning (speed up, reducing memory, etc.).
For instance, how to get rid of the sequence StopVectorDrawing() / GrabImage(11...) / StartVectorDrawing(...) ?
Code: Select all
; Define
#Shades=4
Structure CharType
Width.i
Height.i
DotWidth.i
Bytes.i
EndStructure
Global Char.CharType
Global Dim Matrix(11,1)
With Char
\Width=12
\Height=25
EndWith
LoadFont(0,"Segoe UI",10,#PB_Font_Italic)
;LoadFont(0,"Vivaldi",10,#PB_Font_Bold)
; EndDefine
Procedure CreateFont()
Protected.f cw,ch,fw,fh,mx,my,ox,oy,px,py
Protected i,xmin,xmax,ymin,ymax,z
Protected.s s
CreateImage(11,320,280,32,#White)
StartVectorDrawing(ImageVectorOutput(11))
VectorFont(FontID(0),200)
xmin=9999
ymin=9999
For i=0 To 10
s=Chr('0'+i)
If i=0
fw=VectorTextWidth(s,#PB_VectorText_Default)
fh=VectorTextHeight(s,#PB_VectorText_Default)
EndIf
cw=VectorTextWidth(s,#PB_VectorText_Visible)
ch=VectorTextHeight(s,#PB_VectorText_Visible)
ox=VectorTextWidth(s,#PB_VectorText_Visible|#PB_VectorText_Offset)
oy=VectorTextHeight(s,#PB_VectorText_Visible|#PB_VectorText_Offset)
mx=(fw-cw)/2
my=(fh-ch)/2
z=Round(mx,#PB_Round_Down) : If xmin>z : xmin=z : EndIf :
z=Round(mx+cw,#PB_Round_Up) : If xmax<z : xmax=z : EndIf :
z=Round(my,#PB_Round_Down) : If ymin>z : ymin=z : EndIf :
z=Round(my+ch,#PB_Round_Up) : If ymax<z : ymax=z : EndIf :
#KerningX=50
MovePathCursor(#KerningX+mx-ox,my-oy)
DrawVectorText(s)
StopVectorDrawing()
GrabImage(11,i,0,0,fw+#KerningX*2,fh)
StartVectorDrawing(ImageVectorOutput(11))
VectorSourceColor($FFFFFFFF)
FillVectorOutput()
VectorSourceColor($FF0000000)
VectorFont(FontID(0),200)
Next i
For i=0 To 10
GrabImage(i,i,#KerningX+xmin,ymin,xmax-xmin,ymax-ymin)
ResizeImage(i,Char\Width,Char\Height,#PB_Image_Smooth)
Next i
StopVectorDrawing()
Char\DotWidth=cw*Char\Width/(xmax-xmin); Breite des Doppelpunkts
Char\Bytes=Char\Width*Char\Height
Protected n
Protected ix,iy
Protected w,o
ReDim Matrix(11,Char\Bytes)
w=Char\Width
For i=0 To 10
If i=10
w=Char\DotWidth
o=(Char\Width-w)/2
EndIf
StartDrawing(ImageOutput(i))
n=0
iy=0
While iy<Char\Height
ix=0
While ix<w
z=($FF-(Point(o+ix,iy)&$FF))*#Shades/255
Matrix(i,n)=Round(z,#PB_Round_Nearest)
n+1
ix+1
Wend
iy+1
Wend
StopDrawing()
Next i
EndProcedure
Procedure Dot(x,y,shade)
#Size=8
x*#Size
y*#Size
x+20
y+20
Box(x,y,#Size,#Size,$ffffff-$3f3f3f*shade)
EndProcedure
Procedure test()
CreateFont()
OpenWindow(0,0,0,800,200,"*",#PB_Window_ScreenCentered)
CanvasGadget(0,0,0,800,200)
StartDrawing(CanvasOutput(0))
With Char
y=0
n=0
While y<\Height
x=0
While x<\Width
For c=0 To 9
Dot(x+c*\Width,y,Matrix(c,n))
Next c
n+1
x+1
Wend
y+1
Wend
EndWith
StopDrawing()
Repeat : Until WaitWindowEvent()=#PB_Event_CloseWindow
EndProcedure
test()