Legacy ImageMagick Discussions Archive

Code: Select all

pgg@g550 ~/test
$ ls -l
total 80
-rwxr-xr-x  1 pgg None 15054 Feb  3 12:05 bitmap_made_by_ms_paint.bmp
drwxr-xr-x+ 1 pgg None     0 Jan 30 22:41 include
-rwxr-xr-x  1 pgg None  2653 Feb  3 12:05 jpeg_made_by_ms_paint.jpg
-rwxr-xr-x  1 pgg None  3419 Feb  3 12:16 test.c
-rwxr-xr-x  1 pgg None 57120 Feb  3 12:16 test.exe

pgg@g550 ~/test
$ cat test.c
#include <windows.h>
#include <wchar.h>
#include <stdio.h>
#include <string.h>
#include <wand/magick_wand.h>



// From MS Support Article 158898   http://support.microsoft.com/kb/158898
BOOL LoadBitmapFromBMPFile (LPTSTR szFileName, HBITMAP *phBitmap, HPALETTE *phPalette )
{
  BITMAP bm;

  *phBitmap = NULL;
  *phPalette = NULL;

  // Load image into a DIBSection
  *phBitmap = (HBITMAP)LoadImage( NULL, szFileName, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_DEFAULTSIZE | LR_LOADFROMFILE );

  if( *phBitmap == NULL ) {
    fprintf( stderr, "LoadImage() failed to load image file.\n" );
    return FALSE;
  }

  // Get color depth of the DIBSection
  GetObject( *phBitmap, sizeof(BITMAP), &bm );

  // If the DIBSection is 256 color or less, it has a color table
  if( ( bm.bmBitsPixel * bm.bmPlanes ) <= 8 )
  {
    HDC hMemDC;
    HBITMAP hOldBitmap;
    RGBQUAD rgb[256];
    LPLOGPALETTE pLogPal;
    WORD i;

    // Create a memory DC and select the DIBSection into it
    hMemDC = CreateCompatibleDC( NULL );
    hOldBitmap = (HBITMAP)SelectObject( hMemDC, *phBitmap );

    // Get the DIBSection's color table
    GetDIBColorTable( hMemDC, 0, 256, rgb );

    // Create a palette from the color table
    pLogPal = (LOGPALETTE *)malloc( sizeof(LOGPALETTE) + (256*sizeof(PALETTEENTRY)) );
    pLogPal->palVersion = 0x300;
    pLogPal->palNumEntries = 256;
    for( i = 0; i < 256; i++ ) {
      pLogPal->palPalEntry[i].peRed = rgb[i].rgbRed;
      pLogPal->palPalEntry[i].peGreen = rgb[i].rgbGreen;
      pLogPal->palPalEntry[i].peBlue = rgb[i].rgbBlue;
      pLogPal->palPalEntry[i].peFlags = 0;
    }
    *phPalette = CreatePalette( pLogPal );

    // Clean up
    free( pLogPal );
    SelectObject( hMemDC, hOldBitmap );
    DeleteDC( hMemDC );
  } else { // it has no color table, so use a halftone palette
    HDC hRefDC;
    hRefDC = GetDC( NULL );
    *phPalette = CreateHalftonePalette( hRefDC );
    ReleaseDC( NULL, hRefDC );
  }

  return TRUE;
}


int main() {

  MagickWand *mw = NULL;

  HBITMAP hBitmap;
  HPALETTE hPalette;


  fprintf( stderr, "** Checking LoadImage() with bitmap made with MS paint **\n" );
  if( LoadBitmapFromBMPFile( "bitmap_made_by_ms_paint.bmp", &hBitmap, &hPalette ) )
    fprintf( stderr, "LoadBitMapFromBMPFile successfully loaded 'bitmap_made_by_ms_paint.bmp'\n" );
  else
    fprintf( stderr, "LoadBitMapFromBMPFile failed to load 'bitmap_made_by_ms_paint.bmp'\n" );


  fprintf( stderr, "\n\n** Using MagickWand to convert bitmap to jpeg **\n" );
  MagickWandGenesis();
  mw = NewMagickWand();
  MagickReadImage( mw, "jpeg_made_by_ms_paint.jpg" );
  MagickWriteImage( mw, "bitmap_made_by_magick_wand.bmp" );
  DestroyMagickWand(mw);
  MagickWandTerminus();


  fprintf( stderr, "\n\n** Checking LoadImage() with bitmap made with Magick Wand**\n" );
  if( LoadBitmapFromBMPFile( "bitmap_made_by_magick_wand.bmp", &hBitmap, &hPalette ) )
    fprintf( stderr, "LoadBitMapFromBMPFile successfully loaded 'bitmap_made_by_magick_wand.bmp'\n" );
  else
    fprintf( stderr, "LoadBitMapFromBMPFile failed to load 'bitmap_made_by_magick_wand.bmp'\n" );


  return 0;
}

/*
gcc test.c -o test -lMagickWand-Q16 -lgdi32 -L/home/pgg/ImageMagick-6.8.1/lib -I/home/pgg/ImageMagick-6.8.1/include/ImageMagick -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16
*/


pgg@g550 ~/test
$ gcc test.c -o test -lMagickWand-Q16 -lgdi32 -L/home/pgg/ImageMagick-6.8.1/lib -I/home/pgg/ImageMagick-6.8.1/include/ImageMagick -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16

pgg@g550 ~/test
$ ./test.exe
** Checking LoadImage() with bitmap made with MS paint **
LoadBitMapFromBMPFile successfully loaded 'bitmap_made_by_ms_paint.bmp'


** Using MagickWand to convert bitmap to jpeg **


** Checking LoadImage() with bitmap made with Magick Wand**
LoadImage() failed to load image file.
LoadBitMapFromBMPFile failed to load 'bitmap_made_by_magick_wand.bmp'

pgg@g550 ~/test
$ ls -l
total 96
-rw-r--r--  1 pgg None 15138 Feb  3 12:17 bitmap_made_by_magick_wand.bmp
-rwxr-xr-x  1 pgg None 15054 Feb  3 12:05 bitmap_made_by_ms_paint.bmp
drwxr-xr-x+ 1 pgg None     0 Jan 30 22:41 include
-rwxr-xr-x  1 pgg None  2653 Feb  3 12:05 jpeg_made_by_ms_paint.jpg
-rwxr-xr-x  1 pgg None  3419 Feb  3 12:16 test.c
-rwxr-xr-x  1 pgg None 57120 Feb  3 12:17 test.exe

Code: Select all

convert x.png b.bmp
convert x.png BMP2:b2.bmp
convert x.png BMP3:b3.bmp

Code: Select all

Testing 1
LoadImage() failed to load image file.
LoadBitMapFromBMPFile failed to load 'b1.bmp'

Testing 2
LoadBitMapFromBMPFile successfully loaded 'b2.bmp'

Testing 3
LoadBitMapFromBMPFile successfully loaded 'b3.bmp'

Code: Select all

MagickWriteImage( mw, "BMP2:bitmap_made_by_magick_wand.bmp" );