#include <iostream>
#include <iomanip>
using namespace std;
#include <ft2build.h>
#include FT_FREETYPE_H


#define WIDTH   120
#define HEIGHT  120


unsigned char image[HEIGHT][WIDTH]{ 0 };
int x = 0, y = 0, drawHeight= 0;

void draw_bitmap(FT_Bitmap* bitmap, FT_Int width, FT_Int  height, bool isEndLine = false)
{
	if (x + width > WIDTH)
	{
		x = 0;
		y += height;
	}

	FT_Int  x_max = x + bitmap->width;
	FT_Int  y_max = y + bitmap->rows;

	for (int i = x, p = 0; i < x_max; i++, p++)
	{
		for (int j = y, q = 0; j < y_max; j++, q++)
		{
			if (i < 0 || j < 0 ||
				i >= WIDTH || j >= HEIGHT)
				continue;

			image[j][i] |= bitmap->buffer[q * bitmap->width + p];
		}
	}

	x += width;
	drawHeight = y + height;
	if (isEndLine)
	{
		x = 0;
		y += height;
	}
}


void show_image(void)
{
	for (int i = 0; i < drawHeight; i++)
	{
		for (int j = 0; j < WIDTH; j++)
		{
			putchar(image[i][j] == 0 ? ' '
				: image[i][j] < 128 ? '+'
				: '*');
		}
		putchar('\n');
	}
}


int main()
{
	FT_Library    library;
	FT_Face       face;

	FT_GlyphSlot  slot;
	FT_Matrix     matrix;         
	FT_Error      error;

	error = FT_Init_FreeType(&library);  
	error = FT_New_Face(library, "../../font/FangSong.ttf", 0, &face);
	error = FT_Set_Char_Size(face, 60 * 64, 0, 60, 0);  

	slot = face->glyph;
	int height = (int)((face->size->metrics.height >> 6) * 0.61 -5);

	matrix.xx = (FT_Fixed)(1 * 0x10000L);
	matrix.xy = (FT_Fixed)(0 * 0x10000L);
	matrix.yx = (FT_Fixed)(0 * 0x10000L);
	matrix.yy = (FT_Fixed)(0.61 * 0x10000L);//控制台每行之间有间距，纵向压缩抵消间距，防止字体太高

	FT_Set_Transform(face, &matrix, NULL);
	error = FT_Load_Char(face, L'A', FT_LOAD_RENDER);
	if (!error)
	{
		draw_bitmap(&slot->bitmap, slot->advance.x>>6, height);
	}

	matrix.xx = (FT_Fixed)(1 * 0x10000L);
	matrix.xy = (FT_Fixed)(0.4 * 0x10000L); //斜体
	matrix.yx = (FT_Fixed)(0 * 0x10000L);
	matrix.yy = (FT_Fixed)(0.61 * 0x10000L);

	FT_Set_Transform(face, &matrix, NULL);
	error = FT_Load_Char(face, L'A', FT_LOAD_RENDER);
	if (!error)
	{
		draw_bitmap(&slot->bitmap, slot->advance.x>>6, height, true);
	}


	matrix.xx = (FT_Fixed)(1 * 0x10000L);
	matrix.xy = (FT_Fixed)(0 * 0x10000L);
	matrix.yx = (FT_Fixed)(0 * 0x10000L);
	matrix.yy = (FT_Fixed)(0.61 * 0x10000L);

	FT_Set_Transform(face, &matrix, NULL);
	error = FT_Load_Char(face, L'测', FT_LOAD_RENDER);
	if (!error)
	{
		draw_bitmap(&slot->bitmap, slot->advance.x >> 6, height, true);
	}

	//if (FT_Select_Charmap(face, FT_ENCODING_PRC))
	//{
	//	return 3;
	//}
	//char ch[] = "测";
	//FT_ULong charCode = 0;
	//char *cp = (char*)&charCode;
	//cp[1] = ch[0];
	//cp[0] = ch[1];
	//error = FT_Load_Char(face, charCode, FT_LOAD_RENDER);
	//if (!error)
	//{
	//	draw_bitmap(&slot->bitmap, slot->advance.x >> 6, height);
	//}


	show_image();


	FT_Done_Face(face);
	FT_Done_FreeType(library);

	return 0;
}