mirror of
https://github.com/libretro/RetroArch.git
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82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __RARCH_FONTS_H
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#define __RARCH_FONTS_H
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#include <stdint.h>
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#include "../../boolean.h"
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/* All coordinates and offsets are top-left oriented.
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*
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* This is a texture-atlas approach which allows text to
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* be drawn in a single draw call.
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*
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* It is up to the code using this interface to actually
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* generate proper vertex buffers and upload the atlas texture to GPU. */
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struct font_glyph
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{
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unsigned width;
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unsigned height;
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/* Texel coordinate offset for top-left pixel of this glyph. */
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unsigned atlas_offset_x;
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unsigned atlas_offset_y;
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/* When drawing this glyph, apply an offset to
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* current X/Y draw coordinate. */
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int draw_offset_x;
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int draw_offset_y;
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/* Advance X/Y draw coordinates after drawing this glyph. */
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int advance_x;
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int advance_y;
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};
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struct font_atlas
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{
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uint8_t *buffer; /* Alpha channel. */
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unsigned width;
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unsigned height;
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};
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typedef struct font_renderer_driver
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{
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void *(*init)(const char *font_path, float font_size);
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const struct font_atlas *(*get_atlas)(void *data);
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/* Returns NULL if no glyph for this code is found. */
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const struct font_glyph *(*get_glyph)(void *data, uint32_t code);
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void (*free)(void *data);
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const char *(*get_default_font)(void);
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const char *ident;
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} font_renderer_driver_t;
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extern font_renderer_driver_t freetype_font_renderer;
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extern font_renderer_driver_t bitmap_font_renderer;
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/* font_path can be NULL for default font. */
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bool font_renderer_create_default(const font_renderer_driver_t **driver,
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void **handle, const char *font_path, unsigned font_size);
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#endif
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