adjust imgui font system

[vg.git] / vg_build_font.h

diff --git a/vg_build_font.h b/vg_build_font.h
new file mode 100644 (file)
index 0000000..5f0fd3b
--- /dev/null
+++ b/vg_build_font.h
@@ -0,0 +1,148 @@
+#include "vg_font.h"
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "submodules/stb/stb_image.h"
+
+void vg_build_font_face_run( vg_font_face *face,
+                             char first, char last, i16 x, i16 y )
+{
+   u32 count = (u32)last - (u32)first;
+   for( u32 i=0; i<=count; i ++ )
+   {
+      u32 index = (u32)first + i;
+      face->map[index].x = x+(i*face->cw);
+      face->map[index].y = y;
+   }
+}
+
+void vg_build_write_font_face( FILE *fp, vg_font_face *face )
+{
+   fprintf( fp, "vg_font_face %s = {\n", face->name );
+   fprintf( fp, "   .name=\"%s\",\n", face->name );
+   fprintf( fp, "   .cw=%hd,.ch=%hd,\n", face->cw,face->ch );
+   fprintf( fp, "   .sx=%hd,.sy=%hd,\n", face->sx,face->sy );
+   fprintf( fp, "   .baseline=%hd,\n", face->baseline );
+   fprintf( fp, "   .map={\n" );
+
+   u32 chars = 0;
+
+   for( u32 i=0; i<256; i ++ )
+   {
+      if( face->map[i].x || face->map[i].y )
+      {
+         chars += fprintf( fp, "[%u]={%hd,%hd},",
+                           i, face->map[i].x, face->map[i].y );
+
+         if( chars > 80 )
+         {
+            fprintf( fp, "\n" );
+            chars = 0;
+         }
+      }
+   }
+
+   fprintf( fp, "\n}};\n\n" );
+}
+
+void vg_build_font_sheet( FILE *fp, char *name, const char *source )
+{
+       int x,y,n;
+       unsigned char *data = stbi_load( source, &x, &y, &n, 4 );
+
+   if( !data )
+   {
+               vg_error( "Couldn't open source file\n" );
+               return;
+   }
+       
+   fprintf( fp, "vg_font_sheet %s = {\n", name );
+   fprintf( fp, "   .w=%d, .h=%d,\n", x,y );
+   fprintf( fp, "   .bitmap={\n" );
+   
+   u32 pixel_max = x*y;
+   u32 pixel = 0, chars = 0;
+   while( pixel_max )
+   {
+      u32 buff = 0;
+      for( int b = 31; b >= 0; b-- )
+      {
+         buff |= data[pixel*4]>128?0x1<<b:0;
+         pixel++;
+         
+         if( pixel >= pixel_max )
+         {
+            pixel_max = 0;
+            break;
+         }
+      }
+      
+      chars += fprintf( fp, "%#x,", buff );
+      if( chars > 80 )
+      {
+         fprintf( fp, "\n" );
+         chars = 0;
+      }
+   }
+
+   fprintf( fp, "\n}};\n" );
+   free( data );
+}
+
+void vg_build_default_font(void)
+{
+   FILE *fp = fopen( "vg/vg_default_font.gc", "w" );
+   vg_build_font_sheet( fp, "vg_default_font_sheet", 
+                         "vg/src/fonts/vg_font_thin_3.png" );
+   vg_font_face small =
+   {
+      .name = "vgf_default_small",
+      .cw=8, .ch=14,
+      .sx=8, .sy=14,
+      .baseline = 4
+   };
+   vg_build_font_face_run( &small, '!', '/', 8,  0  );
+   vg_build_font_face_run( &small, '[', '`', 128,0  );
+   vg_build_font_face_run( &small, '{', '~', 176,0  );
+   vg_build_font_face_run( &small, ':', '@', 208,0  );
+   vg_build_font_face_run( &small, 'A', 'Z', 0,  14 );
+   vg_build_font_face_run( &small, 'a', 'z', 0,  28 );
+   vg_build_font_face_run( &small, '0', '9', 208,14 );
+   vg_build_write_font_face( fp, &small );
+
+   vg_font_face large =
+   {
+      .name = "vgf_default_large",
+      .cw=12, .ch=21,
+      .sx=12, .sy=21,
+      .baseline=6,
+   };
+   vg_build_font_face_run( &large, '!', '/', 12, 56  );
+   vg_build_font_face_run( &large, '[', '`', 192,56  );
+   vg_build_font_face_run( &large, '{', '~', 264,56  );
+   vg_build_font_face_run( &large, ':', '@', 324,56  );
+   vg_build_font_face_run( &large, 'A', 'Z', 0,  77  );
+   vg_build_font_face_run( &large, 'a', 'z', 0,  98  );
+   vg_build_font_face_run( &large, '0', '9', 312,77  );
+   vg_build_write_font_face( fp, &large );
+   
+   vg_font_face title =
+   {
+      .name = "vgf_default_title",
+      .cw=24, .ch=42,
+      .sx=24, .sy=42,
+      .baseline=12,
+   };
+   vg_build_font_face_run( &title, '!', '/', 24, 140 );
+   vg_build_font_face_run( &title, '[', '_', 384,140 ); 
+   vg_build_font_face_run( &title, '`', '`', 0,  182 );
+   vg_build_font_face_run( &title, '{', '~', 24, 182 );
+   vg_build_font_face_run( &title, ':', '@', 120,182 );
+   vg_build_font_face_run( &title, 'A', 'U', 0,  224 ); 
+   vg_build_font_face_run( &title, 'V', 'Z', 0,  308 );
+   vg_build_font_face_run( &title, 'a', 'u', 0,  266 ); 
+   vg_build_font_face_run( &title, 'v', 'z', 0,  350 );
+   vg_build_font_face_run( &title, '0', '9', 120,308 );
+   vg_build_write_font_face( fp, &title );
+
+   fclose( fp );
+}