Displaying an image with GDI+

[Vortex]

A small example :

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   .if uMsg == WM_CREATE

        mov     rax,OFFSET StartupInfo
        mov     GdiplusStartupInput.GdiplusVersion[rax],1

        invoke  GdiplusStartup,ADDR token,ADDR StartupInfo,0
        invoke  UnicodeStr,ADDR filename,ADDR UnicodeFileName

        invoke  GdipCreateBitmapFromFile,ADDR UnicodeFileName,\
                ADDR BmpImage

        invoke  GdipCreateHBITMAPFromBitmap,BmpImage,\
                ADDR hBitmap+rip,0

        invoke  GdipDisposeImage,BmpImage

    .elseif uMsg == WM_PAINT

        invoke  BeginPaint,_hWnd,ADDR ps
        mov     hdc,rax

        invoke  CreateCompatibleDC,rax
        mov     hMemDC,rax

        invoke  SelectObject,rax,hBitmap+rip

        invoke  GetObject,hBitmap+rip,sizeof(BITMAP),ADDR bm
       
        lea     r11,bm
        mov     r10d,BITMAP.bmHeight[r11]
        mov     r9d,BITMAP.bmWidth[r11]

        invoke  BitBlt,hdc,0,0,r9,r10,\
                hMemDC,0,0,SRCCOPY
           
        invoke  DeleteDC,hMemDC
        invoke  EndPaint,_hWnd,ADDR ps

[Vortex]

Using GDI+ functions to retrieve the height and width of an image :

Code Select Expand

   .if uMsg == WM_CREATE

        mov     rax,OFFSET StartupInfo
        mov     GdiplusStartupInput.GdiplusVersion[rax],1

        invoke  GdiplusStartup,ADDR token,ADDR StartupInfo,0
        invoke  UnicodeStr,ADDR filename,ADDR UnicodeFileName

        invoke  GdipCreateBitmapFromFile,ADDR UnicodeFileName,\
                ADDR BmpImage

        invoke  GdipGetImageWidth,BmpImage,ADDR ImgWidth+rip
        invoke  GdipGetImageHeight,BmpImage,ADDR ImgHeight+rip

        invoke  GdipCreateHBITMAPFromBitmap,BmpImage,\
                ADDR hBitmap+rip,0

        invoke  GdipDisposeImage,BmpImage
       
        invoke  GdiplusShutdown,token

    .elseif uMsg == WM_PAINT

        invoke  BeginPaint,_hWnd,ADDR ps
        mov     hdc,rax

        invoke  CreateCompatibleDC,rax
        mov     hMemDC,rax

        invoke  SelectObject,rax,hBitmap+rip

        invoke  BitBlt,hdc,0,0,\
                ImgWidth+rip,ImgHeight+rip,\
                hMemDC,0,0,SRCCOPY
           
        invoke  DeleteDC,hMemDC
        invoke  EndPaint,_hWnd,ADDR ps


[TimoVJL]

GdiPlusFlat is capable to paint picture without bitmap.
Perhaps in a your further example is coming ?

[Vortex]

Hi Timo,

About creating a picture without a bitmap, could you provide some detailş?

[TimoVJL]

GdiPlus have some functions for displaying image:

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GpGraphics *g;
GdipCreateFromHDC(hDC, &g);
GdipDrawImage(g, img, 0.0, 0.0);
//GdipDrawImageRect(g, img, 0.0, 0.0, 100.0, 100.0);
GdipDeleteGraphics(g);Naturally painting a bitmap might be faster.

[Vortex]

Hi Timo,

Thanks for the heads-up. Here is a GdipDrawLine example.