Jump to content
  • Advertisement

Archived

This topic is now archived and is closed to further replies.

Alload

Problem while creating a bitmask

This topic is 6301 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I try to make a bitmask of a bitmap, but when I try to get the value of a pixel (TRUE or FALSE), an error occurs. A message box says that the memory can't be read. Here's the code: #include #include using namespace std; /////////////////////////////////////////////////////////////////// class CBoolArray { int width; int height; bool* bArray; public: CBoolArray(int x, int y); ~CBoolArray() {delete [] bArray;} Set(int x, int y, bool value); bool& operator() (int x, int y) {return bArray[x+y*width];} }; CBoolArray::CBoolArray(int x, int y) { width = x; height = y; bArray = new bool[width*height]; } CBoolArray::Set(int x, int y, bool value) { bArray[x+y*width] = value; return 0; } /////////////////////////////////////////////////////////////////// int CreateBitmask(const char szBitmap[], CBoolArray bMask, int width, int height, int rtrans, int gtrans, int btrans) { HDC hdcImage; HBITMAP hbm; int pixelvalue = 0; hbm = (HBITMAP) LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, width, height, LR_CREATEDIBSECTION); if (hbm == NULL) hbm = (HBITMAP) LoadImage(NULL, szBitmap, IMAGE_BITMAP, width, height, LR_LOADFROMFILE | LR_CREATEDIBSECTION); hdcImage = CreateCompatibleDC(NULL); SelectObject(hdcImage, hbm); for (short y = 0; y < height; y++) { for (short x = 0; x < width; x++) { short r, g, b; pixelvalue = GetPixel(hdcImage, x, y); r = (pixelvalue & 0xFF); g = (pixelvalue & 0xFF00)>>8; b = (pixelvalue & 0xFF0000)>>16; if (r != rtrans || g != gtrans || b != btrans) bMask.Set(x, y, true); else bMask.Set(x, y, false); } } return 0; } /////////////////////////////////////////////////////////////////// int main() { CBoolArray BackgroundMask(1024, 768); CreateBitmask("background.bmp", BackgroundMask, 1024, 768, 255, 0, 255); if (BackgroundMask(50, 50) == true) cout << "TRUE" << endl; else cout << "FALSE" << endl; while (1) { } return 0; } I think it's my way of reading the pixel value with BackgroundMask(50, 50) which causes the error. But how can I solve that problem? Thanks. Edited by - Alload on June 22, 2001 4:54:46 AM

Share this post


Link to post
Share on other sites
Advertisement
What if you write a CBoolArray::Get function, just like the Set function, and use it instead?
asd_de

Share this post


Link to post
Share on other sites

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!