BitBlting multiple images to buffer
- by Anonymous
So I've made a class which draws a transparant image to a buffer. the buffer is a HDC which has been used blackness on. What I am trying to do is draw three images to this buffer. Which means I am using this function three times. After that's done, I output it to the screen (using SRCCOPYing the buffer). But what I get to see is just the third image and blackness.
void draw_buffer(HDC buffer, int draw_x, int draw_y)
{
BitBlt(this-main, draw_x, draw_y, this-img_width, this-img_height, this-image, this-mask_x, this-mask_y, SRCAND);
BitBlt(this-main, draw_x, draw_y, this-img_width, this-img_height, this-image, this-img_x, this-img_y, SRCPAINT);
BitBlt(buffer, 0, 0, 800, 600, this-main, 0, 0, SRCCOPY);
}
At initiation, this-main becomes this:
this->main = CreateCompatibleDC(GetDC(0));
this->bitmap = CreateCompatibleBitmap(GetDC(0),800,600);
SelectObject(this->main, this->bitmap);
What is wrong with my code?
