Initial font rendering util.

gfx/fonts.c

@@ -0,0 +1,129 @@
+/*  SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
+ *  Copyright (C) 2010 - Hans-Kristian Arntzen
+ *
+ *  Some code herein may be based on code found in BSNES.
+ * 
+ *  SSNES is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with SSNES.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "fonts.h"
+#include <string.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+struct font_renderer
+{
+   FT_Library lib;
+   FT_Face face;
+};
+
+font_renderer_t *font_renderer_new(const char *font_path, unsigned font_size)
+{
+   (void)font_size;
+   font_renderer_t *handle = calloc(1, sizeof(*handle));
+   if (!handle)
+      goto error;
+
+   FT_Error err = FT_Init_FreeType(&handle->lib);
+   if (err)
+      goto error;
+
+   err = FT_New_Face(handle->lib, font_path, 0, &handle->face);
+   if (err)
+      goto error;
+
+   err = FT_Set_Char_Size(handle->face, 0, 64*64, 1024, 1024);
+   if (err)
+      goto error;
+
+   err = FT_Set_Pixel_Sizes(handle->face, 0, 64);
+   if (err)
+      goto error;
+
+   return handle;
+
+error:
+   free(handle);
+   if (handle->face)
+      FT_Done_Face(handle->face);
+   if (handle->lib)
+      FT_Done_FreeType(handle->lib);
+   return NULL;
+}
+
+void font_renderer_msg(font_renderer_t *handle, const char *msg, struct font_output_list *output) 
+{
+   output->head = NULL;
+
+   FT_GlyphSlot slot = handle->face->glyph;
+   struct font_output *cur = NULL;
+   size_t len = strlen(msg);
+   int off_x = 0, off_y = 0;
+
+   for (size_t i = 0; i < len; i++)
+   {
+      FT_Error err = FT_Load_Char(handle->face, msg[i], FT_LOAD_RENDER);
+
+      if (!err)
+      {
+         struct font_output *tmp = calloc(1, sizeof(*tmp));
+         assert(tmp);
+
+         tmp->output = malloc(slot->bitmap.pitch * slot->bitmap.rows);
+         assert(tmp->output);
+         memcpy(tmp->output, slot->bitmap.buffer, slot->bitmap.pitch * slot->bitmap.rows);
+
+         tmp->width = slot->bitmap.width;
+         tmp->height = slot->bitmap.rows;
+         tmp->pitch = slot->bitmap.pitch;
+         tmp->off_x = off_x + slot->bitmap_left;
+         tmp->off_y = off_y - slot->bitmap_top;
+         tmp->next = NULL;
+
+         if (i == 0)
+            output->head = tmp;
+         else
+            cur->next = tmp;
+
+         cur = tmp;
+      }
+
+      off_x += slot->advance.x >> 6;
+      off_y += slot->advance.y >> 6;
+   }
+}
+
+void font_renderer_free_output(struct font_output_list *output)
+{
+   struct font_output *itr = output->head;
+   struct font_output *tmp = NULL;
+   while (itr != NULL)
+   {
+      free(itr->output);
+      tmp = itr;
+      itr = itr->next;
+      free(tmp);
+   }
+   output->head = NULL;
+}
+
+void font_renderer_free(font_renderer_t *handle)
+{
+   if (handle->face)
+      FT_Done_Face(handle->face);
+   if (handle->lib)
+      FT_Done_FreeType(handle->lib);
+}

gfx/fonts.h

@@ -0,0 +1,44 @@
+/*  SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
+ *  Copyright (C) 2010 - Hans-Kristian Arntzen
+ *
+ *  Some code herein may be based on code found in BSNES.
+ * 
+ *  SSNES is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with SSNES.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef __SSNES_FONTS_H
+#define __SSNES_FONTS_H
+
+#include <stdint.h>
+
+typedef struct font_renderer font_renderer_t;
+
+struct font_output
+{
+   uint8_t *output;
+   unsigned width, height, pitch;
+   int off_x, off_y;
+   struct font_output *next;
+};
+
+struct font_output_list
+{
+   struct font_output *head;
+};
+
+font_renderer_t *font_renderer_new(const char *font_path, unsigned font_size);
+void font_renderer_msg(font_renderer_t *handle, const char *msg, struct font_output_list *output);
+void font_renderer_free_output(struct font_output_list *list);
+void font_renderer_free(font_renderer_t *handle);
+
+#endif