Returns histograms for the Bitmap´s color channels: Red, Green, Blue, Alpha and Grey
#include <GDIPlus.au3>
_GDIPlus_BitmapGetHistogramEx ( $hBitmap )
| $hBitmap | Handle to a Bitmap to which the effect is applied. |
| Success: | an histogram structure: Size - UINT number of elements in each of the histogram arrays Red - UINT[Size] struct array of colorchannel RED histogram MaxRed - UINT maximum value of the RED histogram Green - UINT[Size] struct array of colorchannel GREEN histogram MaxGreen - UINT maximum value of the RED histogram Blue - UINT[Size] struct array of colorchannel BLUE histogram MaxBlue - UINT maximum value of the RED histogram Alpha - UINT[Size] struct array of colorchannel ALPHA histogram MaxAlpha - UINT maximum value of the RED histogram Grey - UINT[Size] struct array of colorchannel GREY histogram MaxGrey - UINT maximum value of the RED histogram |
| Failure: | Sets the @error flag to non-zero, @extended may contain GPSTATUS error code ($GPIP_ERR* see GPIPlusConstants.au3). |
| @error: | -1 - GDIPlus.dll does not support this function. 10 - Invalid parameter. |
None.
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>
#include <MsgBoxConstants.au3>
#include <WindowsConstants.au3>
Opt("GUIOnEventMode", 1)
Global $g_idCombo, $g_hGfx_Buffer, $g_hGfx_Buffer_H, $g_hGui, $g_hGraphics, $g_hGraphics_H, $g_hBmp_Buffer_H, $g_hImage, $g_hBmp_Buffer, $g_hGui_Histogram
_Example()
Func _Example()
If Not _GDIPlus_Startup() Or @extended < 6 Then
MsgBox($MB_SYSTEMMODAL, "Fehler", "GDIPlus.dll v1.1 ist nicht verfügbar")
Return
EndIf
Local $sFile = FileOpenDialog("Bild auswählen", "", "Bilder (*.bmp;*.png;*.jpg;*.gif;*.tif)")
If @error Or Not FileExists($sFile) Then Return
$g_hImage = _GDIPlus_ImageLoadFromFile($sFile)
Local $iWidth = 600
Local $iHeight = _GDIPlus_ImageGetHeight($g_hImage) * 600 / _GDIPlus_ImageGetWidth($g_hImage)
$g_hGui = GUICreate("GDI+ v1.1 (" & @ScriptName & ")", $iWidth, $iHeight)
GUISetOnEvent($GUI_EVENT_CLOSE, "_Exit")
$g_hGraphics = _GDIPlus_GraphicsCreateFromHWND($g_hGui)
$g_hBmp_Buffer = _GDIPlus_BitmapCreateFromScan0($iWidth, $iHeight)
$g_hGfx_Buffer = _GDIPlus_ImageGetGraphicsContext($g_hBmp_Buffer)
_GDIPlus_GraphicsDrawImageRect($g_hGfx_Buffer, $g_hImage, 0, 0, $iWidth, $iHeight)
$g_hGui_Histogram = GUICreate("Histogram", 1029, 140)
GUISetOnEvent($GUI_EVENT_CLOSE, "_Exit")
$g_hGraphics_H = _GDIPlus_GraphicsCreateFromHWND($g_hGui_Histogram)
$g_hBmp_Buffer_H = _GDIPlus_BitmapCreateFromScan0(1029, 140)
$g_hGfx_Buffer_H = _GDIPlus_ImageGetGraphicsContext($g_hBmp_Buffer_H)
_GDIPlus_GraphicsSetSmoothingMode($g_hGfx_Buffer_H, $GDIP_SMOOTHINGMODE_HIGHQUALITY)
Local $tHistogram = _GDIPlus_BitmapGetHistogramEx($g_hImage)
_DrawHistogram($tHistogram)
GUIRegisterMsg($WM_PAINT, "WM_PAINT")
GUIRegisterMsg($WM_ERASEBKGND, "WM_PAINT")
GUISetState(@SW_SHOW, $g_hGui)
GUISetState(@SW_SHOW, $g_hGui_Histogram)
While Sleep(10)
WEnd
EndFunc ;==>_Example
Func _DrawHistogram($tHistogram)
_GDIPlus_GraphicsClear($g_hGfx_Buffer_H, 0xFFFFFFFF)
Local $iValue
Local $fScale = 1 / $tHistogram.MaxGrey * 100
Local $aPoly[259][2] = [[258]]
$aPoly[257][0] = 256
$aPoly[257][1] = 100
$aPoly[258][0] = 1
$aPoly[258][1] = 100
Local $hBrush = _GDIPlus_LineBrushCreate(1, 0, 256, 0, 0xFF000000, 0xFFFF0000, 3)
Local $hPen = _GDIPlus_PenCreate(0xBB000000, 1)
For $i = 1 To 256
$iValue = DllStructGetData($tHistogram, "Red", $i) * $fScale
If $iValue > 100 Then $iValue = 100
$aPoly[$i][0] = $i
$aPoly[$i][1] = 100 - $iValue
Next
_GDIPlus_GraphicsResetTransform($g_hGfx_Buffer_H)
_GDIPlus_GraphicsTranslateTransform($g_hGfx_Buffer_H, 0, 20)
_GDIPlus_GraphicsFillPolygon($g_hGfx_Buffer_H, $aPoly, $hBrush)
_GDIPlus_GraphicsDrawPolygon($g_hGfx_Buffer_H, $aPoly, $hPen)
_GDIPlus_GraphicsFillRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hBrush)
_GDIPlus_GraphicsDrawRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hPen)
_GDIPlus_GraphicsDrawString($g_hGfx_Buffer_H, "Rot", 30, -15)
For $i = 1 To 256
$iValue = DllStructGetData($tHistogram, "Green", $i) * $fScale
If $iValue > 100 Then $iValue = 100
$aPoly[$i][1] = 100 - $iValue
Next
_GDIPlus_LineBrushSetColors($hBrush, 0xFF000000, 0xFF00FF00)
_GDIPlus_GraphicsTranslateTransform($g_hGfx_Buffer_H, 257, 0)
_GDIPlus_GraphicsFillPolygon($g_hGfx_Buffer_H, $aPoly, $hBrush)
_GDIPlus_GraphicsDrawPolygon($g_hGfx_Buffer_H, $aPoly, $hPen)
_GDIPlus_GraphicsFillRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hBrush)
_GDIPlus_GraphicsDrawRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hPen)
_GDIPlus_GraphicsDrawString($g_hGfx_Buffer_H, "Grün", 30, -15)
For $i = 1 To 256
$iValue = DllStructGetData($tHistogram, "Blue", $i) * $fScale
If $iValue > 100 Then $iValue = 100
$aPoly[$i][1] = 100 - $iValue
Next
_GDIPlus_LineBrushSetColors($hBrush, 0xFF000000, 0xFF0000FF)
_GDIPlus_GraphicsTranslateTransform($g_hGfx_Buffer_H, 257, 0)
_GDIPlus_GraphicsFillPolygon($g_hGfx_Buffer_H, $aPoly, $hBrush)
_GDIPlus_GraphicsDrawPolygon($g_hGfx_Buffer_H, $aPoly, $hPen)
_GDIPlus_GraphicsFillRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hBrush)
_GDIPlus_GraphicsDrawRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hPen)
_GDIPlus_GraphicsDrawString($g_hGfx_Buffer_H, "Blau", 30, -15)
For $i = 1 To 256
$iValue = DllStructGetData($tHistogram, "Grey", $i) * $fScale
If $iValue > 100 Then $iValue = 100
$aPoly[$i][1] = 100 - $iValue
Next
_GDIPlus_LineBrushSetColors($hBrush, 0xFF000000, 0xFFFFFFFF)
_GDIPlus_GraphicsTranslateTransform($g_hGfx_Buffer_H, 257, 0)
_GDIPlus_GraphicsFillPolygon($g_hGfx_Buffer_H, $aPoly, $hBrush)
_GDIPlus_GraphicsDrawPolygon($g_hGfx_Buffer_H, $aPoly, $hPen)
_GDIPlus_GraphicsFillRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hBrush)
_GDIPlus_GraphicsDrawRect($g_hGfx_Buffer_H, 1, 102, 255, 16, $hPen)
_GDIPlus_GraphicsDrawString($g_hGfx_Buffer_H, "Grau", 30, -15)
_GDIPlus_BrushDispose($hBrush)
_GDIPlus_PenDispose($hPen)
EndFunc ;==>_DrawHistogram
Func WM_PAINT($hWnd, $iMsgm, $wParam, $lParam)
#forceref $iMsgm, $wParam, $lParam
Switch $hWnd
Case $g_hGui
_GDIPlus_GraphicsDrawImage($g_hGraphics, $g_hBmp_Buffer, 0, 0)
Case $g_hGui_Histogram
_GDIPlus_GraphicsDrawImage($g_hGraphics_H, $g_hBmp_Buffer_H, 0, 0)
EndSwitch
Return $GUI_RUNDEFMSG
EndFunc ;==>WM_PAINT
Func _Exit()
_GDIPlus_ImageDispose($g_hImage)
_GDIPlus_GraphicsDispose($g_hGfx_Buffer_H)
_GDIPlus_BitmapDispose($g_hBmp_Buffer_H)
_GDIPlus_GraphicsDispose($g_hGraphics_H)
_GDIPlus_GraphicsDispose($g_hGfx_Buffer)
_GDIPlus_BitmapDispose($g_hBmp_Buffer)
_GDIPlus_GraphicsDispose($g_hGraphics)
_GDIPlus_Shutdown()
Exit
EndFunc ;==>_Exit