added fonts - works with sdl version

[winnie] / src / text.cc

diff --git a/src/text.cc b/src/text.cc
new file mode 100644 (file)
index 0000000..78bbcaf
--- /dev/null
+++ b/src/text.cc
@@ -0,0 +1,92 @@
+#include <ft2build.h>
+#include <freetype/freetype.h>
+
+#include "gfx.h"
+#include "text.h"
+
+#define DPI 72
+#define FONT_PATH "/usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono.ttf"
+#define FONT_SIZE 16
+
+static int draw_glyph(Pixmap *pixmap, int x, int y, char c);
+
+static FT_Library ft_lib;
+static FT_Face ft_face;
+
+static int text_x, text_y;
+static int text_color[3] = {255, 255, 255};
+
+bool init_text()
+{
+       if(FT_Init_FreeType(&ft_lib)) {
+               fprintf(stderr, "Failed to initialize the FreeType library!\n");
+               return false;
+       }
+
+       if(FT_New_Face(ft_lib, FONT_PATH, 0, &ft_face)) {
+               fprintf(stderr, "Failed to load font: %s\n", FONT_PATH);
+               return false;
+       }
+
+       if(FT_Set_Char_Size(ft_face, 0, FONT_SIZE * 64, DPI, DPI)) {
+               fprintf(stderr, "Failed to set font size\n");
+               return false;
+       }
+
+       return true;
+}
+
+void draw_text(const char *txt, Pixmap *pixmap)
+{
+       if(!pixmap) {
+               pixmap = get_framebuffer_pixmap();
+       }
+
+       while(*txt != 0) {
+               text_x += draw_glyph(pixmap, text_x, text_y, *txt);
+               txt++;
+       }
+}
+
+void set_text_position(int x, int y)
+{
+       text_x = x;
+       text_y = y;
+
+}
+
+void set_text_color(int r, int g, int b)
+{
+       text_color[0] = r;
+       text_color[1] = g;
+       text_color[2] = b;
+}
+
+static int draw_glyph(Pixmap *pixmap, int x, int y, char c)
+{
+       if(FT_Load_Char(ft_face, c, FT_LOAD_RENDER)) {
+               return 0;
+       }
+
+       x += ft_face->glyph->bitmap_left;
+       y -= ft_face->glyph->bitmap_top;
+
+       FT_Bitmap *ft_bmp = &ft_face->glyph->bitmap;
+       unsigned char *bmp_ptr = ft_bmp->buffer;
+       unsigned char *pxm_ptr = pixmap->get_image() + (pixmap->get_width() * y + x) * 4;
+
+       for(int i=0; i<ft_bmp->rows; i++) {
+               for(int j=0; j<ft_bmp->width; j++) {
+                       if(bmp_ptr[j]) {
+                               int a = (int)bmp_ptr[j];
+                               pxm_ptr[4 * j] = (a * text_color[0] + pxm_ptr[4 * j] * (255 - a)) / 255;
+                               pxm_ptr[4 * j + 1] = (a * text_color[1] + pxm_ptr[4 * j + 1] * (255 - a)) / 255;
+                               pxm_ptr[4 * j + 2] = (a * text_color[2] + pxm_ptr[4 * j + 2] * (255 - a)) / 255;
+                       }
+               }
+               pxm_ptr += 4 * pixmap->get_width();
+               bmp_ptr += ft_bmp->pitch;
+       }
+
+       return ft_face->glyph->advance.x >> 6;
+}