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Library to display an image (JPG/GIF/BMP) in 300 lines/8K of code

, 1 Dec 2002 313.8K 51
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A simple yet powerful library to display an image in a window.

Introduction

Here is a sample of what is possible to do with just plain C. This code will display in a window an image that can be in JPG, GIF, BMP, or Windows metafile format.

Compiled with the lcc-Win32 compiler, the code is just 8K. No other language gives you this kind of efficiency. A similar piece of code in C++ weights more than 170K!

The interface is like this:

  1. You tell it the name of the graphic file
    HANDLE h = OpenGraphic(char *filename);

    That handle is used for closing the image.

  2. When painting your window, you pass it the hwnd and the hDC you get from BeginPaint.
    DisplayGraphic(HWND hwnd,HDC hdc);
  3. When finished, you close it with.
    void CloseGraphic(HANDLE h);

Note that CoInitialize() must be called before using these functions.

I did not add "bells and whistles" to keep the code simple to understand. You may add scrollbars, redimensioning whatever.

This code was developed with the lcc-win32 C compiler. You can download it at no charge from here.

P.S.: This contribution was critized because I did not use Microsoft tools. I know I am biased, but I tried to correct my evil ways. I took the dust out of MSVC 6.0 and OK, here is it, complete with .dsw file in a standard Microsoft Project.

Other critics pointed out to a bug in the transcription, where I added a "*" too much. I fixed that, and I thank the people who pointed me that bug.

It is interesting to note that the code size of the program as compiled with MSVC is 32K, with lcc-win32 is just 8K.

Nobody is perfect...

#include "windows.h"
#include "ocidl.h"
#include "olectl.h"

typedef struct tagImgInfo {
  IPicture *Ipic;
  SIZE sizeInHiMetric;
  SIZE sizeInPix;
  char *Path;
} IMG_INFO;

static IMG_INFO ImageInfo;

void *OpenGraphic(char *name)
{
  IPicture *Ipic = NULL;
  SIZE sizeInHiMetric,sizeInPix;
  const int HIMETRIC_PER_INCH = 2540;
  HDC hDCScreen = GetDC(NULL);
  HRESULT hr;
  int nPixelsPerInchX = GetDeviceCaps(hDCScreen, LOGPIXELSX);
  int nPixelsPerInchY = GetDeviceCaps(hDCScreen, LOGPIXELSY);
  unsigned short OlePathName[512];

  ReleaseDC(NULL,hDCScreen);
  mbstowcs(OlePathName,name,strlen(name)+1);
  hr = OleLoadPicturePath(OlePathName,
        NULL,
        0,
        0,
        &IID_IPicture,
        (void *)(&Ipic));
  if (hr)
    return 0;
  if (Ipic) {
    // get width and height of picture
    hr = Ipic->lpVtbl->get_Width(Ipic,&sizeInHiMetric.cx);
    if (!SUCCEEDED(hr))
      goto err;
    Ipic->lpVtbl->get_Height(Ipic,&sizeInHiMetric.cy);
    if (!SUCCEEDED(hr))
      goto err;

    // convert himetric to pixels
    sizeInPix.cx = (nPixelsPerInchX * sizeInHiMetric.cx +
              HIMETRIC_PER_INCH / 2) / HIMETRIC_PER_INCH;
    sizeInPix.cy = (nPixelsPerInchY * sizeInHiMetric.cy +
              HIMETRIC_PER_INCH / 2) / HIMETRIC_PER_INCH;
    ImageInfo.sizeInPix = sizeInPix;
    ImageInfo.sizeInHiMetric = sizeInHiMetric;
    ImageInfo.Ipic = Ipic;
    ImageInfo.Path = name;
    return Ipic;

  }
err:
  return 0;
}
void DisplayGraphic(HWND hwnd,HDC pDC)
{
  IPicture *Ipic = ImageInfo.Ipic;
  DWORD dwAttr = 0;
  HBITMAP Bmp,BmpOld;
  RECT rc;
  HRESULT hr;
  HPALETTE pPalMemOld;

  if (Ipic != NULL)
  {
    // get palette
    OLE_HANDLE hPal = 0;
    HPALETTE hPalOld=NULL,hPalMemOld=NULL;
    hr = Ipic->lpVtbl->get_hPal(Ipic,&hPal);

    if (!SUCCEEDED(hr))
      return;
    if (hPal != 0)
    {
      hPalOld = SelectPalette(pDC,(HPALETTE)hPal,FALSE);
      RealizePalette(pDC);
    }

    // Fit the image to the size of the client area. Change this
    // For more sophisticated scaling
    GetClientRect(hwnd,&rc);
    // transparent?
    if (SUCCEEDED(Ipic->lpVtbl->get_Attributes(Ipic,&dwAttr)) ||
      (dwAttr & PICTURE_TRANSPARENT))
    {
      // use an off-screen DC to prevent flickering
      HDC MemDC = CreateCompatibleDC(pDC);
      Bmp = 
       CreateCompatibleBitmap(pDC,ImageInfo.sizeInPix.cx,ImageInfo.sizeInPix.cy);

      BmpOld = SelectObject(MemDC,Bmp);
      pPalMemOld = NULL;
      if (hPal != 0)
      {
        hPalMemOld = SelectPalette(MemDC,(HPALETTE)hPal, FALSE);
        RealizePalette(MemDC);
      }
/* Use this to show the left corner
      rc.left = rc.top = 0;
      rc.right = ImageInfo.sizeInPix.cx;
        rc.bottom = ImageInfo.sizeInPix.cy;
*/
      // display picture using IPicture::Render
      hr = Ipic->lpVtbl->Render(Ipic,MemDC,
      0,
      0,
      rc.right,
      rc.bottom,
      0,
      ImageInfo.sizeInHiMetric.cy,
      ImageInfo.sizeInHiMetric.cx,
      -ImageInfo.sizeInHiMetric.cy,
      &rc);

      BitBlt(pDC,0, 0, ImageInfo.sizeInPix.cx, 
                               ImageInfo.sizeInPix.cy,
        MemDC, 0, 0, SRCCOPY);

      SelectObject(MemDC,BmpOld);

      if (pPalMemOld)  SelectPalette(MemDC,pPalMemOld, FALSE);
      DeleteObject(Bmp);
      DeleteDC(MemDC);

    }
    else
    {
      // display picture using IPicture::Render
      Ipic->lpVtbl->Render(Ipic,pDC,
       0,
       0,
       rc.right,
       rc.bottom,
       0,
       ImageInfo.sizeInHiMetric.cy,
       ImageInfo.sizeInHiMetric.cx,
       -ImageInfo.sizeInHiMetric.cy,
       &rc);
    }

    if (hPalOld != NULL) SelectPalette(pDC,hPalOld, FALSE);
    if (hPal)  DeleteObject((HPALETTE)hPal);
  }
}

void CloseImage(void *Ipict)
{
  IPicture *ip = (IPicture *)Ipict;

  if (ip == NULL)
    ip = ImageInfo.Ipic;
  if (ip == NULL)
    return;
  ip->lpVtbl->Release(ip);
  memset(&ImageInfo,0,sizeof(ImageInfo));
}

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Jacob Navia
Web Developer
France France
I am the author of the lcc-win32 C compiler system. http://www.cs.virginia.edu/~lcc-win32

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Comments and Discussions

 
GeneralMy vote of 5 - demonstrates use of non-Microsoft tools Pin
EdCaputo19-Jun-14 23:10
memberEdCaputo19-Jun-14 23:10 
GeneralMy vote of 5 Pin
manoj kumar choubey26-Feb-12 20:56
membermanoj kumar choubey26-Feb-12 20:56 
GeneralMy vote of 5 Pin
Raghavan145-Jan-12 6:27
memberRaghavan145-Jan-12 6:27 
GeneralMy vote of 3 Pin
Marcus Elliott13-Oct-10 0:45
memberMarcus Elliott13-Oct-10 0:45 
GeneralI need help Pin
Gbenbam6-Aug-10 2:43
memberGbenbam6-Aug-10 2:43 
GeneralLooks like a little bug Pin
mouseparty17-Feb-06 1:24
membermouseparty17-Feb-06 1:24 
GeneralRe: Looks like a little bug Pin
victoryli14-Apr-08 10:12
membervictoryli14-Apr-08 10:12 
GeneralRelease VS Pin
Anonymous6-Feb-05 17:20
sussAnonymous6-Feb-05 17:20 
GeneralRotating the image Pin
Alex Evans4-Jan-05 9:24
memberAlex Evans4-Jan-05 9:24 
GeneralBinary size Pin
Mr.Prakash2-Mar-04 4:37
memberMr.Prakash2-Mar-04 4:37 
General28 Kb Pin
essersr11-Feb-04 9:31
memberessersr11-Feb-04 9:31 
GeneralRe: 28 Kb Pin
victoryli14-Apr-08 8:25
membervictoryli14-Apr-08 8:25 
GeneralPlease help me ! Pin
Anonymous18-Oct-03 1:39
sussAnonymous18-Oct-03 1:39 
QuestionRender ? Pin
librazone20-Jun-03 16:29
memberlibrazone20-Jun-03 16:29 
AnswerRe: Render ? Pin
Anonymous24-Jun-03 21:55
sussAnonymous24-Jun-03 21:55 
GeneralRe: Render ? Pin
kubicle7-Jan-05 20:21
memberkubicle7-Jan-05 20:21 
GeneralCode Size Pin
Anonymous8-Mar-03 23:39
sussAnonymous8-Mar-03 23:39 
GeneralRe: Code Size Pin
Kvasi30-Mar-03 5:37
memberKvasi30-Mar-03 5:37 
GeneralRe: Code Size Pin
Anonymous5-May-03 20:16
sussAnonymous5-May-03 20:16 
GeneralRe: Code Size Pin
Anonymous19-Mar-05 4:35
sussAnonymous19-Mar-05 4:35 
Generalneither simple nor powerful Pin
Anonymous3-Dec-02 13:16
sussAnonymous3-Dec-02 13:16 
GeneralRe: neither simple nor powerful Pin
Jacob Navia5-Dec-02 3:11
memberJacob Navia5-Dec-02 3:11 
GeneralRe: neither simple nor powerful Pin
Rufus V. Smith5-Aug-03 6:45
memberRufus V. Smith5-Aug-03 6:45 
General170K? no way Pin
Anonymous2-Dec-02 20:55
sussAnonymous2-Dec-02 20:55 
GeneralBad news Pin
Anonymous2-Dec-02 19:09
sussAnonymous2-Dec-02 19:09 
GeneralRe: Bad news Pin
Tarmo2-Dec-02 20:02
memberTarmo2-Dec-02 20:02 
GeneralRe: Bad news Pin
Jacob Navia2-Dec-02 22:34
memberJacob Navia2-Dec-02 22:34 
GeneralRe: Bad news Pin
Johann Gerell2-Dec-02 23:22
memberJohann Gerell2-Dec-02 23:22 
GeneralRe: Bad news Pin
Jacob Navia2-Dec-02 22:39
memberJacob Navia2-Dec-02 22:39 
GeneralRe: Bad news Pin
Daniel Turini2-Dec-02 22:59
memberDaniel Turini2-Dec-02 22:59 
GeneralRe: Bad news Pin
alfcas3-Dec-02 0:32
memberalfcas3-Dec-02 0:32 
GeneralRe: Bad news Pin
Daniel Turini3-Dec-02 3:26
memberDaniel Turini3-Dec-02 3:26 
GeneralRe: Bad news, bad manners Pin
Anonymous26-Oct-05 23:25
sussAnonymous26-Oct-05 23:25 
GeneralRe: Bad news, bad manners Pin
Daniel Turini27-Oct-05 1:35
memberDaniel Turini27-Oct-05 1:35 
GeneralRe: Bad news Pin
Anonymous2-Dec-02 23:53
sussAnonymous2-Dec-02 23:53 
GeneralRe: Bad news Pin
KarstenK3-Dec-02 1:50
memberKarstenK3-Dec-02 1:50 
GeneralRe: Bad news Pin
Hatod19-Sep-06 5:59
memberHatod19-Sep-06 5:59 
GeneralRe: Bad news : Viva Monsieur Navia! Pin
Stephen Liti22-Jan-03 2:33
sussStephen Liti22-Jan-03 2:33 
Dear Monsieur Navia,

Your LCC-Compiler is really great. Those who say otherwise can't have
tried it. Thanks a million for letting us use it free of charge.
For those who speak ill of it, I've got only one message:
«HONNIT SOIT QUI MAL Y PENSE!»

GeneralRe: Bad news Pin
victoryli14-Apr-08 8:22
membervictoryli14-Apr-08 8:22 
GeneralRe: Bad news Pin
victoryli14-Apr-08 8:28
membervictoryli14-Apr-08 8:28 
GeneralRe: Bad news Pin
victoryli14-Apr-08 8:41
membervictoryli14-Apr-08 8:41 
GeneralRe: Bad news Pin
victoryli14-Apr-08 11:01
membervictoryli14-Apr-08 11:01 
GeneralEnvironment Pin
Victor Boctor2-Dec-02 14:28
memberVictor Boctor2-Dec-02 14:28 

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