The E_RGBX macro shouldn't be used when plotting pixels directly. Here is a piece of sample code to plot a pixel and handle the several colordepths (assuming the red, green and blue values go from 0 to 255):
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Video_Buffer[x * xpitch + y * ypitch]=((red & 0xF0) << 4) | (green & 0xF0) | ((blue & 0xF0) >> 4);
Video_Buffer[x * xpitch + y * ypitch]=((red & 0xF8) << 8) | ((green & 0xFC) << 3) | ((blue & 0xF8) >> 3);
Video_Buffer[x * xpitch + y * ypitch]=(red << 16) | (green << 8) | blue;
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More information about the pixel formats:
For Windows Desktop the most commonly used format is EDSP_TRUE32, unless it's set to 16-bit colors in the display configuration. On Windows Mobile EDSP_TRUE16 is used, but there is a big chance that EDSP_TRUE32 is used as well or will be used in the future. For Symbian it uses all three, although EDSP_TRUE12 is used in old devices (for example, Nokia N-Gage).