RetroArch/gfx/fonts/bitmapfont.c

134 lines
4.1 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
*
* RetroArch 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.
*
* RetroArch 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 RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "fonts.h"
#include "bitmap.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "../../msvc/msvc_compat.h"
#include "../../boolean.h"
#define ATLAS_COLS 16
#define ATLAS_ROWS 16
#define ATLAS_SIZE (ATLAS_COLS * ATLAS_ROWS)
typedef struct bm_renderer
{
unsigned scale_factor;
struct font_glyph glyphs[ATLAS_SIZE];
struct font_atlas atlas;
} bm_renderer_t;
static const struct font_atlas *font_renderer_bmp_get_atlas(void *data)
{
bm_renderer_t *handle = (bm_renderer_t*)data;
return &handle->atlas;
}
static const struct font_glyph *font_renderer_bmp_get_glyph(
void *data, uint32_t code)
{
bm_renderer_t *handle = (bm_renderer_t*)data;
return code < ATLAS_SIZE ? &handle->glyphs[code] : NULL;
}
static void char_to_texture(bm_renderer_t *handle, uint8_t letter,
unsigned atlas_x, unsigned atlas_y)
{
unsigned y, x, xo, yo;
uint8_t *target = handle->atlas.buffer + atlas_x +
atlas_y * handle->atlas.width;
for (y = 0; y < FONT_HEIGHT; y++)
{
for (x = 0; x < FONT_WIDTH; x++)
{
unsigned font_pixel = x + y * FONT_WIDTH;
uint8_t rem = 1 << (font_pixel & 7);
unsigned offset = font_pixel >> 3;
uint8_t col = (bitmap_bin[FONT_OFFSET(letter) + offset] & rem) ? 0xff : 0;
uint8_t *dst = target;
dst += x * handle->scale_factor;
dst += y * handle->scale_factor * handle->atlas.width;
for (yo = 0; yo < handle->scale_factor; yo++)
for (xo = 0; xo < handle->scale_factor; xo++)
dst[xo + yo * handle->atlas.width] = col;
}
}
}
static void *font_renderer_bmp_init(const char *font_path, float font_size)
{
(void)font_path;
unsigned i;
bm_renderer_t *handle = (bm_renderer_t*)calloc(1, sizeof(*handle));
if (!handle)
return NULL;
handle->scale_factor = (unsigned)roundf(font_size / FONT_HEIGHT);
if (!handle->scale_factor)
handle->scale_factor = 1;
handle->atlas.width = FONT_WIDTH * handle->scale_factor * ATLAS_COLS;
handle->atlas.height = FONT_HEIGHT * handle->scale_factor * ATLAS_ROWS;
handle->atlas.buffer = (uint8_t*)calloc(handle->atlas.width * handle->atlas.height, 1);
for (i = 0; i < ATLAS_SIZE; i++)
{
unsigned x = (i % ATLAS_COLS) * handle->scale_factor * FONT_WIDTH;
unsigned y = (i / ATLAS_COLS) * handle->scale_factor * FONT_HEIGHT;
char_to_texture(handle, i, x, y);
handle->glyphs[i].width = FONT_WIDTH * handle->scale_factor;
handle->glyphs[i].height = FONT_HEIGHT * handle->scale_factor;
handle->glyphs[i].atlas_offset_x = x;
handle->glyphs[i].atlas_offset_y = y;
handle->glyphs[i].draw_offset_x = 0;
handle->glyphs[i].draw_offset_y = -FONT_HEIGHT_BASELINE * (int)handle->scale_factor;
handle->glyphs[i].advance_x = (FONT_WIDTH + 1) * handle->scale_factor;
handle->glyphs[i].advance_y = 0;
}
return handle;
}
static void font_renderer_bmp_free(void *data)
{
bm_renderer_t *handle = (bm_renderer_t*)data;
if (!handle)
return;
free(handle->atlas.buffer);
free(handle);
}
static const char *font_renderer_bmp_get_default_font(void)
{
return "";
}
font_renderer_driver_t bitmap_font_renderer = {
font_renderer_bmp_init,
font_renderer_bmp_get_atlas,
font_renderer_bmp_get_glyph,
font_renderer_bmp_free,
font_renderer_bmp_get_default_font,
"bitmap",
};