Hello, I am relatively new to FreeType, and first I want to say thank you
to the developers. Well, my question is about the format of the bitmap
buffer returned by using FT_RENDER_MODE_MONO. I want to get bitmaps that
are not anti-aliased and my end target is OpenGL textures that use 32-bits
per pixel (8 per channel RGBA). So I need to do the conversion from the
1-bit per pixel output. What I would like is for all four components of the
texture (unsigned bytes) to be either 0 or 255 based on the glyph bitmap.
Below is some code that I tried but it only rendered garbage. Any
suggestions on how to go about this?
//Allocate memory for the texture data (four component)
GLubyte *data = new GLubyte[4 * slot->bitmap.width * slot->bitmap.rows];
//Set color to white and alpha to bitmap value
unsigned int bmIndex = 0, dataIndex = 0, byteIndex, bitOffset;
unsigned char byte;
for(int j=0; j < slot->bitmap.rows; j++) {
for(int i=0; i < slot->bitmap.width; i++){
//Get the byte index and bit offset
byteIndex = bmIndex / 8;
bitOffset = bmIndex % 8;
//Get the byte
byte = slot->bitmap.buffer[byteIndex];
//Rotate, AND, and multiply to get 0 or 255 value
byte = ((byte >> bitOffset) & 1) * 255;
//Set all four components of the GL texture
data[dataIndex++] = byte;
data[dataIndex++] = byte;
data[dataIndex++] = byte;
data[dataIndex++] = byte;
//Increment bmIndex
bmIndex++;
}
}
Thanks,
Graham
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