eleni.mutantstargoat.com Git - winnie/blob - src/text.cc

   1 #include <ft2build.h>
   2 #include <freetype/freetype.h>
   3
   4 #include "gfx.h"
   5 #include "text.h"
   6
   7 #define DPI 72
   8 #define FONT_PATH "/usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono.ttf"
   9 #define FONT_SIZE 16
  10
  11 static int draw_glyph(Pixmap *pixmap, int x, int y, char c);
  12
  13 struct Text {
  14         FT_Library ft_lib;
  15         FT_Face ft_face;
  16         int text_x, text_y;
  17         int text_color[3];
  18 };
  19
  20 static Text *text;
  21
  22 bool init_text()
  23 {
  24         if(!(text = (Text*)malloc(sizeof *text))) {
  25                 return false;
  26         }
  27
  28         if(FT_Init_FreeType(&text->ft_lib)) {
  29                 fprintf(stderr, "Failed to initialize the FreeType library!\n");
  30                 return false;
  31         }
  32
  33         if(FT_New_Face(text->ft_lib, FONT_PATH, 0, &text->ft_face)) {
  34                 fprintf(stderr, "Failed to load font: %s\n", FONT_PATH);
  35                 return false;
  36         }
  37
  38         if(FT_Set_Char_Size(text->ft_face, 0, FONT_SIZE * 64, DPI, DPI)) {
  39                 fprintf(stderr, "Failed to set font size\n");
  40                 return false;
  41         }
  42
  43         set_text_color(255, 255, 255);
  44
  45         return true;
  46 }
  47
  48 void draw_text(const char *txt, Pixmap *pixmap)
  49 {
  50         if(!pixmap) {
  51                 pixmap = get_framebuffer_pixmap();
  52         }
  53
  54         while(*txt != 0) {
  55                 text->text_x += draw_glyph(pixmap, text->text_x, text->text_y, *txt);
  56                 txt++;
  57         }
  58 }
  59
  60 void set_text_position(int x, int y)
  61 {
  62         text->text_x = x;
  63         text->text_y = y;
  64
  65 }
  66
  67 void set_text_color(int r, int g, int b)
  68 {
  69         text->text_color[0] = r;
  70         text->text_color[1] = g;
  71         text->text_color[2] = b;
  72 }
  73
  74 static int draw_glyph(Pixmap *pixmap, int x, int y, char c)
  75 {
  76         if(FT_Load_Char(text->ft_face, c, FT_LOAD_RENDER)) {
  77                 return 0;
  78         }
  79
  80         x += text->ft_face->glyph->bitmap_left;
  81         y -= text->ft_face->glyph->bitmap_top;
  82
  83         FT_Bitmap *ft_bmp = &text->ft_face->glyph->bitmap;
  84         unsigned char *bmp_ptr = ft_bmp->buffer;
  85         unsigned char *pxm_ptr = pixmap->get_image() + (pixmap->get_width() * y + x) * 4;
  86
  87         Rect clipping_rect = get_clipping_rect();
  88
  89         for(int i=0; i<ft_bmp->rows; i++) {
  90                 int dest_y = i + y;
  91                 if(dest_y >= clipping_rect.y + clipping_rect.height) {
  92                         break;
  93                 }
  94
  95                 if(dest_y >= clipping_rect.y) {
  96                         for(int j=0; j<ft_bmp->width; j++) {
  97                                 int dest_x = j + x;
  98
  99                                 if(dest_x >= clipping_rect.x + clipping_rect.width) {
 100                                         break;
 101                                 }
 102
 103                                 if(bmp_ptr[j] && dest_x >= clipping_rect.x) {
 104                                         int a = (int)bmp_ptr[j];
 105                                         pxm_ptr[4 * j] = (a * text->text_color[0] + pxm_ptr[4 * j] * (255 - a)) / 255;
 106                                         pxm_ptr[4 * j + 1] = (a * text->text_color[1] + pxm_ptr[4 * j + 1] * (255 - a)) / 255;
 107                                         pxm_ptr[4 * j + 2] = (a * text->text_color[2] + pxm_ptr[4 * j + 2] * (255 - a)) / 255;
 108                                 }
 109                         }
 110                 }
 111
 112                 pxm_ptr += 4 * pixmap->get_width();
 113                 bmp_ptr += ft_bmp->pitch;
 114         }
 115
 116         return text->ft_face->glyph->advance.x >> 6;
 117 }