GDI+: GdipGetImagePixelFormat

[José Roca]

The following console application creates an Image object. The code gets the pixel format of the Image object and then compares the obtained value to particular pixel format constants.

C++

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#include <windows.h>
#include <gdiplus.h>
#include <stdio.h>
using namespace Gdiplus;

INT main()
{
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR gdiplusToken;
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   Image* image1 = new Image(L"Mosaic.png");
   Image* image2 = new Image(L"Stripes8Bit.bmp");

   PixelFormat pixelFormat1 = image1->GetPixelFormat();
   PixelFormat pixelFormat2 = image2->GetPixelFormat();

   if(pixelFormat1 == PixelFormat24bppRGB)
      printf("The pixel format of image 1 is 24bppRGB.\n");

   if(pixelFormat2 == PixelFormat8bppIndexed)
      printf("The pixel format of image 2 is 8bppIndexed.\n");

   delete image1;
   delete image2;
   GdiplusShutdown(gdiplusToken);
   return 0;


PowerBASIC

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#COMPILE EXE
#DIM ALL
#INCLUDE "GDIPLUS.INC"

' ========================================================================================
' Main
' ========================================================================================
FUNCTION PBMAIN

   LOCAL hStatus AS LONG
   LOCAL token AS DWORD
   LOCAL StartupInput AS GdiplusStartupInput
   LOCAL pImage AS DWORD
   LOCAL strFileName AS STRING
   LOCAL nFormat AS LONG
   LOCAL strFormat AS STRING

   ' // Initialize GDI+
   StartupInput.GdiplusVersion = 1
   hStatus = GdiplusStartup(token, StartupInput, BYVAL %NULL)
   IF hStatus THEN
      PRINT "Error initializing GDI+"
      EXIT FUNCTION
   END IF

   strFileName = UCODE$("Shapes.jpg")
   hStatus = GdipLoadImageFromFile(STRPTR(strFileName), pImage)

   hStatus = GdipGetImagePixelFormat(pImage, nFormat)
   SELECT CASE AS LONG nFormat
      CASE %PixelFormat1bppIndexed    : strFormat = "1 bpp indexed"
      CASE %PixelFormat4bppIndexed    : strFormat = "4 bpp indexed"
      CASE %PixelFormat8bppIndexed    : strFormat = "8 bpp indexed"
      CASE %PixelFormat16bppGrayScale : strFormat = "16 bpp gray scale"
      CASE %PixelFormat16bppRGB555    : strFormat = "16 bpp RGB 555"
      CASE %PixelFormat16bppRGB565    : strFormat = "16 bpp RGB 565"
      CASE %PixelFormat16bppARGB1555  : strFormat = "16 bpp ARGB 1555"
      CASE %PixelFormat24bppRGB       : strFormat = "24 bpp RGB"
      CASE %PixelFormat32bppRGB       : strFormat = "32 bpp RGB"
      CASE %PixelFormat32bppARGB      : strFormat = "32 bpp ARGB"
      CASE %PixelFormat32bppPARGB     : strFormat = "32 bpp PARGB"
      CASE %PixelFormat48bppRGB       : strFormat = "48 bpp RGB"
      CASE %PixelFormat64bppARGB      : strFormat = "64 bpp ARGB"
      CASE %PixelFormat64bppPARGB     : strFormat = "64 bpp PARGB"
      CASE ELSE                       : strFormat = FORMAT$(nFormat)
   END SELECT

   PRINT "The pixel format of the image is " & strFormat

   ' // Cleanup
   IF pImage THEN GdipDisposeImage(pImage)

   ' // Shutdown GDI+
   GdiplusShutdown token

   WAITKEY$

END FUNCTION
' ========================================================================================