Bitmap help

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From: JoeC on 3 Dec 2009 16:07

---

I have been going through my book looking for a bitmap example. I
want to find the correct bitmap header then manually plug in the color
and bit data then bilt that over to a bitmap. I want to create my own
graphics editor. I have not had any success in win32 although I can
do it in Direct X.

I am looking for the header so I can:

bitmap.x =16
bitmap.y=16
bitmap.palette[16] or [256] (color palette)
bitmap.bitdata[] = an array with pixle data.

then take that make an image that I can eventually edit.

From: marc on 4 Dec 2009 12:48

---

On 3 déc, 22:07, JoeC <enki...(a)yahoo.com> wrote:
> I have been going through my book looking for a bitmap example.  I
> want to find the correct bitmap header then manually plug in the color
> and bit data then bilt that over to a bitmap.  I want to create my own
> graphics editor.  I have not had any success in win32 although I can
> do it in Direct X.
> I am looking for the header so I can:
> bitmap.x =16
> bitmap.y=16
> bitmap.palette[16] or [256] (color palette)
> bitmap.bitdata[] = an array with pixle data.
> then take that make an image that I can eventually edit.

Why don't you use LoadImage() ?

From: JoeC on 4 Dec 2009 22:17

---

On Dec 4, 11:48 am, marc <marc.tes...(a)caramail.com> wrote:
> On 3 déc, 22:07, JoeC <enki...(a)yahoo.com> wrote:
>
> > I have been going through my book looking for a bitmap example.  I
> > want to find the correct bitmap header then manually plug in the color
> > and bit data then bilt that over to a bitmap.  I want to create my own
> > graphics editor.  I have not had any success in win32 although I can
> > do it in Direct X.
> > I am looking for the header so I can:
> > bitmap.x =16
> > bitmap.y=16
> > bitmap.palette[16] or [256] (color palette)
> > bitmap.bitdata[] = an array with pixle data.
> > then take that make an image that I can eventually edit.
>
> Why don't you use LoadImage() ?

Sorry, I am using C++ win32. I can do this in directX with this
struct.

struct BITMAP_FILE{
BITMAPFILEHEADER bitmapfileheader;
BITMAPINFOHEADER bitmapinfoheader;
PALETTEENTRY * palette;
BYTE * buffer;
};

I got this one from another book.

struct BITMAP_INFO{
BITMAPFILEHEADER bmHead;
RGBQUAD bmColor[16];
};

I have seen several ways to do it but they all involve loading a
file. I want to create a picture by plugging in the data then move on
to making a customized bitmap editing program. I have already done
one for a monochrome bitmap.

From: Friedel Jantzen on 5 Dec 2009 01:35

---

Hi,

> Sorry, I am using C++ win32. I can do this in directX with this
> struct.
>
> struct BITMAP_FILE{
> BITMAPFILEHEADER bitmapfileheader;
> BITMAPINFOHEADER bitmapinfoheader;
> PALETTEENTRY * palette;
> BYTE * buffer;
> };

This is correct.
However with bitsPerPixel >= 16 there is no palette required.

> I got this one from another book.
>
> struct BITMAP_INFO{
> BITMAPFILEHEADER bmHead;
> RGBQUAD bmColor[16];
> };

This is not correct: BITMAPINFOHEADER is required.

> I have seen several ways to do it but they all involve loading a
> file. I want to create a picture by plugging in the data then move on
> to making a customized bitmap editing program. I have already done
> one for a monochrome bitmap.

You can use CreateDIBSection:
http://msdn.microsoft.com/en-us/library/dd183494(VS.85).aspx
Before writing the bmp file, you must write the BITMAPFILEHEADER.

Or you can prepare a memory block by foot.
Look here how to setup BITMAPINFOHEADER:
http://msdn.microsoft.com/en-us/library/dd183376(VS.85).aspx

Here is a sample for a 16bit bmp:

<code>

HGLOBAL CreateTestBmp16()
{
LONG width = 601;
LONG height = 400;
WORD bitsPerPixel = 16;
LONG lineLen = width; // count of 16bit-pixel in scanline
if(lineLen & 1) lineLen++; // bytes in line must be multiple of 4
LONG dataSize = height * lineLen * 2; // *2 : 16bit = 2 bytes
const DWORD headerSize = sizeof(BITMAPFILEHEADER) +
sizeof(BITMAPINFOHEADER);
DWORD fileSize = headerSize + dataSize;

HGLOBAL hBmp = GlobalAlloc(GHND, fileSize);
if(hBmp == NULL) return NULL;
LPBYTE bmpPtr = (LPBYTE)GlobalLock(hBmp);

// Header
PBITMAPFILEHEADER fHdr;
PBITMAPINFOHEADER iHdr;
LPBYTE bPtr;

fHdr = PBITMAPFILEHEADER(bmpPtr);
bPtr = bmpPtr + sizeof(BITMAPFILEHEADER);
iHdr = PBITMAPINFOHEADER(bPtr);
bPtr += sizeof(BITMAPINFOHEADER);

fHdr->bfType = 0x4D42; // "BM", Little Endian
fHdr->bfSize = fileSize;
fHdr->bfReserved1 = 0;
fHdr->bfReserved2 = 0;
fHdr->bfOffBits = headerSize;

iHdr->biSize = sizeof(BITMAPINFOHEADER);
iHdr->biWidth = width;
iHdr->biHeight = height;
iHdr->biPlanes = 1;
iHdr->biBitCount = bitsPerPixel;
iHdr->biCompression = BI_RGB; // no compression
//iHdr->biSizeImage = 0; // must set this, if compressed
//iHdr->biXPelsPerMeter = 0;
//iHdr->biYPelsPerMeter = 0;
//iHdr->biClrUsed = 0;
//iHdr->biClrImportant = 0;

// pixel data
unsigned __int16 *linePtr = (unsigned __int16 *)bPtr;
unsigned __int16 *pixPtr;

for(int h = 0; h < height; h++) {
pixPtr = linePtr;
for(int w = 0; w < width; w++) {
*pixPtr++ = (unsigned __int16)((w + h) & 0xFFFF); // 16 bit: b5g5r5a1
}
linePtr += lineLen;
}

GlobalUnlock(hBmp);
return hBmp;
}

</code>

HTH,
Friedel

From: JoeC on 6 Dec 2009 04:55

---

On Dec 5, 12:35 am, Friedel Jantzen <nospam_...(a)freenet.de> wrote:
> Hi,
>
> > Sorry, I am using C++ win32.  I can do this in directX with this
> > struct.
>
> > struct BITMAP_FILE{
> >   BITMAPFILEHEADER bitmapfileheader;
> >   BITMAPINFOHEADER bitmapinfoheader;
> >   PALETTEENTRY    * palette;
> >   BYTE            * buffer;
> > };
>
> This is correct.
> However with bitsPerPixel >= 16 there is no palette required.
>
> > I got this one from another book.
>
> > struct BITMAP_INFO{
> >   BITMAPFILEHEADER bmHead;
> >   RGBQUAD          bmColor[16];
> > };
>
> This is not correct: BITMAPINFOHEADER is required.
>
> > I have seen several ways to do it but they all involve loading a
> > file.  I want to create a picture by plugging in the data then move on
> > to making a customized bitmap editing program.  I have already done
> > one for a monochrome bitmap.
>
> You can use CreateDIBSection:http://msdn.microsoft.com/en-us/library/dd183494(VS.85).aspx
> Before writing the bmp file, you must write the BITMAPFILEHEADER.
>
> Or you can prepare a memory block by foot.
> Look here how to setup BITMAPINFOHEADER:http://msdn.microsoft.com/en-us/library/dd183376(VS.85).aspx
>
> Here is a sample for a 16bit bmp:
>
> <code>
>
> HGLOBAL CreateTestBmp16()
> {
>   LONG width  = 601;
>   LONG height = 400;
>   WORD bitsPerPixel = 16;
>   LONG lineLen = width; // count of 16bit-pixel in scanline
>   if(lineLen & 1) lineLen++; // bytes in line must be multiple of 4
>   LONG dataSize = height * lineLen * 2; // *2 : 16bit = 2 bytes
>   const DWORD headerSize = sizeof(BITMAPFILEHEADER) +
> sizeof(BITMAPINFOHEADER);
>   DWORD fileSize = headerSize + dataSize;
>
>   HGLOBAL hBmp = GlobalAlloc(GHND, fileSize);
>   if(hBmp == NULL) return NULL;
>   LPBYTE bmpPtr = (LPBYTE)GlobalLock(hBmp);
>
>   // Header
>   PBITMAPFILEHEADER fHdr;
>   PBITMAPINFOHEADER iHdr;
>   LPBYTE bPtr;
>
>   fHdr = PBITMAPFILEHEADER(bmpPtr);
>   bPtr = bmpPtr + sizeof(BITMAPFILEHEADER);
>   iHdr = PBITMAPINFOHEADER(bPtr);
>   bPtr += sizeof(BITMAPINFOHEADER);
>
>   fHdr->bfType = 0x4D42; // "BM", Little Endian
>   fHdr->bfSize = fileSize;
>   fHdr->bfReserved1 = 0;
>   fHdr->bfReserved2 = 0;
>   fHdr->bfOffBits = headerSize;
>
>   iHdr->biSize = sizeof(BITMAPINFOHEADER);
>   iHdr->biWidth = width;
>   iHdr->biHeight = height;
>   iHdr->biPlanes = 1;
>   iHdr->biBitCount = bitsPerPixel;
>   iHdr->biCompression = BI_RGB; // no compression
>   //iHdr->biSizeImage = 0; // must set this, if compressed
>   //iHdr->biXPelsPerMeter = 0;
>   //iHdr->biYPelsPerMeter = 0;
>   //iHdr->biClrUsed = 0;
>   //iHdr->biClrImportant = 0;
>
>   // pixel data
>   unsigned __int16 *linePtr = (unsigned __int16 *)bPtr;
>   unsigned __int16 *pixPtr;
>
>   for(int h = 0; h < height; h++) {
>    pixPtr = linePtr;
>    for(int w = 0; w < width; w++) {
>     *pixPtr++ = (unsigned __int16)((w + h) & 0xFFFF); // 16 bit: b5g5r5a1
>    }
>    linePtr += lineLen;
>   }
>
>   GlobalUnlock(hBmp);
>   return hBmp;
>
> }
>
> </code>
>
> HTH,
>  Friedel

Thanks.

What commands can I look up to add a palette to a bitmap. I created a
16 color palette because I didn't want to add in 256 colors. What I
want to do is create a bitmap that is not just monochrome.

I am looking for how to create the bitmap then attach the pixel data
and the palette.

This what I have for my current bitmap.

BYTE cdata[] = {0xff, 0xff, 0xff,
0,0,0,
0xff,0,0, ...
//RGB Color data

int num = 16;
BYTE * pdata = &cdata[0];

int datasz = 3*num;
int count = 0;

while(count < datasz/num ){

bfo.bmColor[count].rgbRed = *pdata++;
bfo.bmColor[count].rgbBlue = *pdata++;
bfo.bmColor[count].rgbGreen = *pdata++;
bfo.bmColor[count].rgbReserved = PC_NOCOLLAPSE;;
count++;
}

(I create a palette very similar to this in DX. But I can't figure
out how to add the palette to the bitmap.)

BITMAP bitmap = {0,16,16,2,1,1};

bitmap.bmBits = data; //Pixel data

hbitmap = CreateBitmapIndirect(&bitmap);
hdc = GetDC(hwnd);
HDC hdcmem = CreateCompatibleDC(hdc);

SelectObject(hdcmem, hbitmap);


BitBlt(hdc, 100, 150, 16, 16 , hdcmem, 0, 0,
SRCCOPY);



DeleteDC(hdcmem);
ReleaseDC(hwnd, hdc);

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