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help. bmp loading tramma

Started by Mardigin Jan 12, 2002 at 12:33 AM 0 replies 500+ views

Original Post

Jan 12, 2002 at 12:33 AM

I am loading an 8bit 256 color bmp. Now it works most of the time, but it crashes with some bmp. specifically bmp''s that I make in photoshop. The following are some snippets of code that may have something to do with my problem. NOte I actually crash on the memcpy bytes_per_line = bitmap->bitmapinfoheader.biWidth*(bitmap->bitmapinfoheader.biBitCount/8) if (!(buffer = (UCHAR *)malloc(bytes_per_line*height))) return(0); memcpy(buffer,image,bytes_per_line*height);

Countach

Jan 12, 2002 at 3:15 AM

Your problem is that you don''t check for padding bytes that may occur when the width of the bitmap is odd.

Use this:

  
if(width % 2 == 0) {
// Width is even, the texture can be loaded directly and then flipped

    uint bufferLength = width * height;
    uchar *buffer = new uchar[bufferLength];

    // Read all data into the texture

    stream.readBuffer(buffer, bufferLength);

} else {
    // Width is odd so there will be padding (extra bytes for proper memory alignment) 

    // in the bitmap.

    // Bitmaps put the padding bytes at the end of each line

			
    uint bufferLength = (width + 1) * height;
    uchar *buffer = new uchar[bufferLength];

    // Read all data into the texture

    stream.readBuffer(buffer, bufferLength);

}

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