158 строки
3.9 KiB
C
158 строки
3.9 KiB
C
/* example1.c */
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/* */
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/* This small program shows how to print a rotated string with the */
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/* FreeType 2 library. */
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <stdlib.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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int WIDTH = 0;
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int HEIGHT = 0;
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/* origin is the upper left corner */
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unsigned char *image;
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/* Replace this function with something useful. */
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void
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draw_bitmap( FT_Bitmap* bitmap,
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FT_Int x,
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FT_Int y)
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{
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FT_Int i, j, p, q;
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FT_Int x_max = x + bitmap->width;
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FT_Int y_max = y + bitmap->rows;
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for ( i = x, p = 0; i < x_max; i++, p++ )
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{
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for ( j = y, q = 0; j < y_max; j++, q++ )
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{
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if ( i < 0 || j < 0 ||
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i >= WIDTH || j >= HEIGHT )
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continue;
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image[j*WIDTH + i] |= bitmap->buffer[q * bitmap->width + p];
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}
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}
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}
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void
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show_image( void )
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{
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int i, j;
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int count = 0;
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for ( i = 0; i < HEIGHT; i++ )
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{
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for ( j = 0; j < WIDTH; j++ ) {
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if (image[i*WIDTH + j]) count++;
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putchar( image[i*WIDTH + j] == 0 ? ' '
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: image[i*WIDTH + j] < 128 ? '+'
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: '*' );
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}
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putchar( '\n' );
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}
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printf("Non-0s: %d\n", count);
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}
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int
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main( int argc,
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char** argv )
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{
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FT_Library library;
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FT_Face face;
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FT_GlyphSlot slot;
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FT_Matrix matrix; /* transformation matrix */
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FT_Vector pen; /* untransformed origin */
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FT_Error error;
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char* filename;
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char* text;
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double angle;
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int target_height;
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int n, num_chars;
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if ( argc != 6 )
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{
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fprintf ( stderr, "usage: %s font sample-text width height angle\n", argv[0] );
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exit( 1 );
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}
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filename = argv[1]; /* first argument */
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text = argv[2]; /* second argument */
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num_chars = strlen( text );
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WIDTH = atoi(argv[3]);
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HEIGHT = atoi(argv[4]);
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angle = ( ((float)atoi(argv[5])) / 360 ) * 3.14159 * 2; /* use 25 degrees */
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target_height = HEIGHT;
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image = (unsigned char*)malloc(WIDTH*HEIGHT);
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for (int x = 0; x < WIDTH; x++)
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for (int y = 0; y < HEIGHT; y++)
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image[y*WIDTH + x] = 0;
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error = FT_Init_FreeType( &library ); /* initialize library */
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if (error) printf("Init Error! %d\n", error);
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error = FT_New_Face( library, argv[1], 0, &face ); /* create face object */
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if (error) printf("New_Face Error! %d\n", error);
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/* use 50pt at 100dpi */
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error = FT_Set_Char_Size( face, 50 * 64, 0,
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100, 0 ); /* set character size */
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if (error) printf("Set_Char_Size Error! %d\n", error);
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slot = face->glyph;
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/* set up matrix */
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matrix.xx = (FT_Fixed)( cos( angle ) * 0x10000L );
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matrix.xy = (FT_Fixed)(-sin( angle ) * 0x10000L );
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matrix.yx = (FT_Fixed)( sin( angle ) * 0x10000L );
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matrix.yy = (FT_Fixed)( cos( angle ) * 0x10000L );
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pen.x = 1000;
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pen.y = 0;
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for ( n = 0; n < num_chars; n++ )
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{
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/* set transformation */
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FT_Set_Transform( face, &matrix, &pen );
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/* load glyph image into the slot (erase previous one) */
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error = FT_Load_Char( face, text[n], FT_LOAD_RENDER );
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if ( error )
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continue; /* ignore errors */
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/* now, draw to our target surface (convert position) */
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draw_bitmap( &slot->bitmap,
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slot->bitmap_left,
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target_height - slot->bitmap_top );
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/* increment pen position */
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pen.x += slot->advance.x;
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pen.y += slot->advance.y;
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}
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show_image();
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FT_Done_Face ( face );
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FT_Done_FreeType( library );
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return 0;
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}
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/* EOF */
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