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RetroArch/gfx/font_driver.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
*
* 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 <stdlib.h>
#include <math.h>
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include "font_driver.h"
#include "video_thread_wrapper.h"
/* TODO/FIXME - global */
static void *video_font_driver = NULL;
int font_renderer_create_default(
const font_renderer_driver_t **drv,
void **handle, const char *font_path, unsigned font_size)
{
static const font_renderer_driver_t *font_backends[] = {
#ifdef HAVE_FREETYPE
&freetype_font_renderer,
#endif
#if defined(__APPLE__) && defined(HAVE_CORETEXT)
&coretext_font_renderer,
#endif
#ifdef HAVE_STB_FONT
#if defined(VITA) || defined(ORBIS) || defined(WIIU) || defined(ANDROID) || (defined(_WIN32) && !defined(_XBOX) && !defined(_MSC_VER) && _MSC_VER >= 1400) || (defined(_WIN32) && !defined(_XBOX) && defined(_MSC_VER)) || defined(HAVE_LIBNX) || defined(__linux__) || defined (HAVE_EMSCRIPTEN) || defined(__APPLE__) || defined(HAVE_ODROIDGO2) || defined(__PS3__)
&stb_unicode_font_renderer,
#else
&stb_unicode_font_renderer,
#endif
#endif
&bitmap_font_renderer,
NULL
};
unsigned i;
for (i = 0; font_backends[i]; i++)
{
const char *path = font_path;
if (!path)
path = font_backends[i]->get_default_font();
if (!path)
continue;
*handle = font_backends[i]->init(path, font_size);
if (*handle)
{
*drv = font_backends[i];
return 1;
}
}
*drv = NULL;
*handle = NULL;
return 0;
}
static bool font_init_first(
const void **font_driver, void **font_handle,
void *video_data, const char *font_path, float font_size,
enum font_driver_render_api api, bool is_threaded)
{
if (font_path && !font_path[0])
font_path = NULL;
switch (api)
{
#ifdef HAVE_OPENGL1
case FONT_DRIVER_RENDER_OPENGL1_API:
{
void *data = gl1_raster_font.init(
video_data, font_path, font_size, is_threaded);
if (data)
{
*font_driver = &gl1_raster_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_OPENGL
case FONT_DRIVER_RENDER_OPENGL_API:
{
void *data = gl2_raster_font.init(
video_data, font_path, font_size, is_threaded);
if (data)
{
*font_driver = &gl2_raster_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_OPENGL_CORE
case FONT_DRIVER_RENDER_OPENGL_CORE_API:
{
void *data = gl3_raster_font.init(
video_data, font_path, font_size, is_threaded);
if (data)
{
*font_driver = &gl3_raster_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_VULKAN
case FONT_DRIVER_RENDER_VULKAN_API:
{
void *data = vulkan_raster_font.init(video_data,
font_path, font_size, is_threaded);
if (data)
{
*font_driver = &vulkan_raster_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_METAL
case FONT_DRIVER_RENDER_METAL_API:
{
void *data = metal_raster_font.init(video_data,
font_path, font_size, is_threaded);
if (data)
{
*font_driver = &metal_raster_font;
*font_handle = data;
return true;
}
}
#endif
#ifdef HAVE_D3D8
case FONT_DRIVER_RENDER_D3D8_API:
{
static const font_renderer_t *d3d8_font_backends[] = {
NULL
};
unsigned i;
for (i = 0; i < ARRAY_SIZE(d3d8_font_backends); i++)
{
void *data = d3d8_font_backends[i] ? d3d8_font_backends[i]->init(
video_data, font_path, font_size, is_threaded) : NULL;
if (data)
{
*font_driver = d3d8_font_backends[i];
*font_handle = data;
return true;
}
}
}
break;
#endif
#ifdef HAVE_D3D9
case FONT_DRIVER_RENDER_D3D9_API:
{
static const font_renderer_t *d3d9_font_backends[] = {
#if defined(_WIN32) && defined(HAVE_D3DX)
&d3d9x_win32_font,
#endif
NULL
};
unsigned i;
for (i = 0; i < ARRAY_SIZE(d3d9_font_backends); i++)
{
void *data = d3d9_font_backends[i] ? d3d9_font_backends[i]->init(
video_data, font_path, font_size, is_threaded) : NULL;
if (data)
{
*font_driver = d3d9_font_backends[i];
*font_handle = data;
return true;
}
}
}
break;
#endif
#ifdef HAVE_D3D10
case FONT_DRIVER_RENDER_D3D10_API:
{
void *data = d3d10_font.init(video_data,
font_path, font_size, is_threaded);
if (data)
{
*font_driver = &d3d10_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_D3D11
case FONT_DRIVER_RENDER_D3D11_API:
{
void *data = d3d11_font.init(video_data,
font_path, font_size, is_threaded);
if (data)
{
*font_driver = &d3d11_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_D3D12
case FONT_DRIVER_RENDER_D3D12_API:
{
void *data = d3d12_font.init(video_data,
font_path, font_size, is_threaded);
if (data)
{
*font_driver = &d3d12_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_VITA2D
case FONT_DRIVER_RENDER_VITA2D:
{
void *data = vita2d_vita_font.init(
video_data, font_path, font_size, is_threaded);
if (data)
{
*font_driver = &vita2d_vita_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef PS2
case FONT_DRIVER_RENDER_PS2:
{
void *data = ps2_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &ps2_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef _3DS
case FONT_DRIVER_RENDER_CTR:
{
void *data = ctr_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &ctr_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef WIIU
case FONT_DRIVER_RENDER_WIIU:
{
void *data = wiiu_font.init(
video_data, font_path, font_size, is_threaded);
if (data)
{
*font_driver = &wiiu_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_CACA
case FONT_DRIVER_RENDER_CACA:
{
void *data = caca_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &caca_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_SIXEL
case FONT_DRIVER_RENDER_SIXEL:
{
void *data = sixel_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &sixel_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_LIBNX
case FONT_DRIVER_RENDER_SWITCH:
{
void *data = switch_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &switch_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_GCM
case FONT_DRIVER_RENDER_RSX:
{
void *data = rsx_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &rsx_font;
*font_handle = data;
return true;
}
}
break;
#endif
#ifdef HAVE_GDI
#if defined(_WIN32) && !defined(_XBOX) && !defined(__WINRT__)
case FONT_DRIVER_RENDER_GDI:
{
void *data = gdi_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &gdi_font;
*font_handle = data;
return true;
}
}
break;
#endif
#endif
#ifdef DJGPP
case FONT_DRIVER_RENDER_VGA:
{
void *data = vga_font.init(
video_data, font_path, font_size,
is_threaded);
if (data)
{
*font_driver = &vga_font;
*font_handle = data;
return true;
}
}
break;
#endif
case FONT_DRIVER_RENDER_DONT_CARE:
/* TODO/FIXME - lookup graphics driver's 'API' */
break;
default:
break;
}
return false;
}
#ifdef HAVE_LANGEXTRA
/* ASCII: 0xxxxxxx (c & 0x80) == 0x00
* other start: 11xxxxxx (c & 0xC0) == 0xC0
* other cont: 10xxxxxx (c & 0xC0) == 0x80
* Neutral:
* 0020 - 002F: 001xxxxx (c & 0xE0) == 0x20
* misc. white space:
* 2000 - 200D: 11100010 10000000 1000xxxx (c[2] < 0x8E) (3 bytes)
* Hebrew:
* 0591 - 05F4: 1101011x (c & 0xFE) == 0xD6 (2 bytes)
* Arabic:
* 0600 - 06FF: 110110xx (c & 0xFC) == 0xD8 (2 bytes)
*/
/* clang-format off */
#define IS_ASCII(p) ((*(p)&0x80) == 0x00)
#define IS_MBSTART(p) ((*(p)&0xC0) == 0xC0)
#define IS_MBCONT(p) ((*(p)&0xC0) == 0x80)
#define IS_DIR_NEUTRAL(p) ((*(p)&0xE0) == 0x20)
#define IS_HEBREW(p) ((*(p)&0xFE) == 0xD6)
#define IS_ARABIC(p) ((*(p)&0xFC) == 0xD8)
#define IS_RTL(p) (IS_HEBREW(p) || IS_ARABIC(p))
#define GET_ID_ARABIC(p) (((unsigned char)(p)[0] << 6) | ((unsigned char)(p)[1] & 0x3F))
/* Checks for miscellaneous whitespace characters in the range U+2000 to U+200D */
static INLINE unsigned is_misc_ws(const unsigned char* src)
{
unsigned res = 0;
if (*(src) == 0xE2) /* first byte */
{
src++;
if (*(src) == 0x80) /* second byte */
{
src++;
res = (*(src) < 0x8E); /* third byte */
}
}
return res;
}
static INLINE unsigned font_get_arabic_replacement(
const char* src, const char* start)
{
/* 0x0620 to 0x064F */
static const unsigned arabic_shape_map[0x100][0x4] = {
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0600 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0610 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, /* 0x0620 */
{ 0xFE80 },
{ 0xFE81, 0xFE82 },
{ 0xFE83, 0xFE84 },
{ 0xFE85, 0xFE86 },
{ 0xFE87, 0xFE88 },
{ 0xFE89, 0xFE8A, 0xFE8B, 0xFE8C },
{ 0xFE8D, 0xFE8E },
{ 0xFE8F, 0xFE90, 0xFE91, 0xFE92 },
{ 0xFE93, 0xFE94 },
{ 0xFE95, 0xFE96, 0xFE97, 0xFE98 },
{ 0xFE99, 0xFE9A, 0xFE9B, 0xFE9C },
{ 0xFE9D, 0xFE9E, 0xFE9F, 0xFEA0 },
{ 0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4 },
{ 0xFEA5, 0xFEA6, 0xFEA7, 0xFEA8 },
{ 0xFEA9, 0xFEAA },
{ 0xFEAB, 0xFEAC }, /* 0x0630 */
{ 0xFEAD, 0xFEAE },
{ 0xFEAF, 0xFEB0 },
{ 0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4 },
{ 0xFEB5, 0xFEB6, 0xFEB7, 0xFEB8 },
{ 0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC },
{ 0xFEBD, 0xFEBE, 0xFEBF, 0xFEC0 },
{ 0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4 },
{ 0xFEC5, 0xFEC6, 0xFEC7, 0xFEC8 },
{ 0xFEC9, 0xFECA, 0xFECB, 0xFECC },
{ 0xFECD, 0xFECE, 0xFECF, 0xFED0 },
{ 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, /* 0x0640 */
{ 0xFED1, 0xFED2, 0xFED3, 0xFED4 },
{ 0xFED5, 0xFED6, 0xFED7, 0xFED8 },
{ 0xFED9, 0xFEDA, 0xFEDB, 0xFEDC },
{ 0xFEDD, 0xFEDE, 0xFEDF, 0xFEE0 },
{ 0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4 },
{ 0xFEE5, 0xFEE6, 0xFEE7, 0xFEE8 },
{ 0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC },
{ 0xFEED, 0xFEEE },
{ 0xFEEF, 0xFEF0, 0xFBE8, 0xFBE9 },
{ 0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4 },
{ 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0650 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0660 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0670 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 },
{ 0xFB56, 0xFB57, 0xFB58, 0xFB59 },
{ 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0680 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x0690 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x06A0 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 },
{ 0xFB8E, 0xFB8F, 0xFB90, 0xFB91 },
{ 0 }, { 0 },
{ 0 }, { 0 }, { 0 },
{ 0xFB92, 0xFB93, 0xFB94, 0xFB95 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x06B0 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x06C0 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0xFBFC, 0xFBFD, 0xFBFE, 0xFBFF },
{ 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x06D0 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x06E0 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 }, /* 0x06F0 */
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
{ 0 }, { 0 }, { 0 }, { 0 },
};
unsigned result = 0;
bool prev_connected = false;
bool next_connected = false;
unsigned char id = GET_ID_ARABIC(src);
const char* prev = src - 2;
const char* next = src + 2;
if (IS_ARABIC(prev) && (prev >= start))
{
unsigned char prev_id = GET_ID_ARABIC(prev);
/* nonspacing diacritics 0x4b -- 0x5f */
while (prev_id > 0x4A && prev_id < 0x60)
{
prev -= 2;
if ((prev >= start) && IS_ARABIC(prev))
prev_id = GET_ID_ARABIC(prev);
else
break;
}
if (prev_id == 0x44) /* Arabic Letter Lam */
{
unsigned char prev2_id = 0;
const char* prev2 = prev - 2;
if (prev2 >= start)
prev2_id = (prev2[0] << 6) | (prev2[1] & 0x3F);
/* nonspacing diacritics 0x4b -- 0x5f */
while (prev2_id > 0x4A && prev2_id < 0x60)
{
prev2 -= 2;
if ((prev2 >= start) && IS_ARABIC(prev2))
prev2_id = GET_ID_ARABIC(prev2);
else
break;
}
prev_connected = !!arabic_shape_map[prev2_id][2];
switch (id)
{
case 0x22: /* Arabic Letter Alef with Madda Above */
return 0xFEF5 + prev_connected;
case 0x23: /* Arabic Letter Alef with Hamza Above */
return 0xFEF7 + prev_connected;
case 0x25: /* Arabic Letter Alef with Hamza Below */
return 0xFEF9 + prev_connected;
case 0x27: /* Arabic Letter Alef */
return 0xFEFB + prev_connected;
}
}
prev_connected = !!arabic_shape_map[prev_id][2];
}
if (IS_ARABIC(next))
{
unsigned char next_id = GET_ID_ARABIC(next);
/* nonspacing diacritics 0x4b -- 0x5f */
while (next_id > 0x4A && next_id < 0x60)
{
next += 2;
if (!IS_ARABIC(next))
break;
next_id = GET_ID_ARABIC(next);
}
next_connected = !!arabic_shape_map[next_id][1];
}
if ((result =
arabic_shape_map[id][prev_connected | (next_connected <<
1)]))
return result;
return arabic_shape_map[id][prev_connected];
}
/* clang-format on */
static char* font_driver_reshape_msg(const char* msg, unsigned char *buffer, size_t buffer_size)
{
const unsigned char *src = (const unsigned char*)msg;
bool reverse = false;
size_t msg_size = (strlen(msg) * 2) + 1;
/* Fallback to heap allocated buffer if the buffer is too small */
/* worst case transformations are 2 bytes to 4 bytes -- aliaspider */
unsigned char* dst_buffer = (buffer_size < msg_size)
? (unsigned char*)malloc(msg_size)
: buffer;
unsigned char *dst = (unsigned char*)dst_buffer;
while (*src || reverse)
{
if (reverse)
{
src--;
while (src > (const unsigned char*)msg && IS_MBCONT(src))
src--;
if (src >= (const unsigned char*)msg && (IS_RTL(src) || IS_DIR_NEUTRAL(src) || is_misc_ws(src)))
{
if (IS_ARABIC(src))
{
unsigned replacement = font_get_arabic_replacement(
(const char*)src, msg);
if (replacement)
{
if (replacement < 0x80)
*dst++ = replacement;
else if (replacement < 0x800)
{
*dst++ = 0xC0 | (replacement >> 6);
*dst++ = 0x80 | (replacement & 0x3F);
}
else if (replacement < 0x10000)
{
/* merged glyphs */
if ((replacement >= 0xFEF5) && (replacement <= 0xFEFC))
src -= 2;
*dst++ = 0xE0 | ( replacement >> 12);
*dst++ = 0x80 | ((replacement >> 6) & 0x3F);
*dst++ = 0x80 | ( replacement & 0x3F);
}
else
{
*dst++ = 0xF0 | (replacement >> 18);
*dst++ = 0x80 | ((replacement >> 12) & 0x3F);
*dst++ = 0x80 | ((replacement >> 6) & 0x3F);
*dst++ = 0x80 | ( replacement & 0x3F);
}
continue;
}
}
*dst++ = *src++;
while (IS_MBCONT(src))
*dst++ = *src++;
src--;
while (IS_MBCONT(src))
src--;
}
else
{
reverse = false;
src++;
while ( IS_MBCONT(src)
|| IS_RTL(src)
|| IS_DIR_NEUTRAL(src)
|| is_misc_ws(src))
src++;
}
}
else
{
if (IS_RTL(src))
{
reverse = true;
while ( IS_MBCONT(src)
|| IS_RTL(src)
|| IS_DIR_NEUTRAL(src)
|| is_misc_ws(src))
src++;
}
else
*dst++ = *src++;
}
}
*dst = '\0';
return (char*)dst_buffer;
}
#endif
void font_driver_render_msg(void *data, const char *msg,
const struct font_params *params, void *font_data)
{
font_data_t *font = (font_data_t*)(font_data
? font_data : video_font_driver);
if (msg && *msg && font && font->renderer && font->renderer->render_msg)
{
#ifdef HAVE_LANGEXTRA
unsigned char tmp_buffer[64];
char *new_msg = font_driver_reshape_msg(msg, tmp_buffer, sizeof(tmp_buffer));
#else
char *new_msg = (char*)msg;
#endif
font->renderer->render_msg(data,
font->renderer_data, new_msg, params);
#ifdef HAVE_LANGEXTRA
if (new_msg != (char*)tmp_buffer)
free(new_msg);
#endif
}
}
void font_driver_bind_block(void *font_data, void *block)
{
font_data_t *font = (font_data_t*)(font_data ? font_data : video_font_driver);
if (font && font->renderer && font->renderer->bind_block)
font->renderer->bind_block(font->renderer_data, block);
}
/* Flushing is slow - only do it if font has actually been used */
void font_flush(
unsigned video_width,
unsigned video_height,
font_data_impl_t *font_data)
{
if (font_data->raster_block.carr.coords.vertices == 0)
return;
if (font_data->font && font_data->font->renderer && font_data->font->renderer->flush)
font_data->font->renderer->flush(video_width, video_height, font_data->font->renderer_data);
font_data->raster_block.carr.coords.vertices = 0;
}
int font_driver_get_message_width(void *font_data,
const char *msg, size_t len, float scale)
{
font_data_t *font = (font_data_t*)(font_data ? font_data : video_font_driver);
if (len == 0 && msg)
len = strlen(msg);
if (font && font->renderer && font->renderer->get_message_width)
return font->renderer->get_message_width(font->renderer_data, msg, len, scale);
return -1;
}
int font_driver_get_line_height(font_data_t *font, float scale)
{
struct font_line_metrics *metrics = NULL;
/* First try the line metrics implementation */
if (font && font->renderer && font->renderer->get_line_metrics)
if ((font->renderer->get_line_metrics(
font->renderer_data, &metrics)))
return (int)roundf(metrics->height * scale);
/* Else return an approximation
* (uses a fudge of standard font metrics - mostly garbage...)
* > font_size = (width of 'a') / 0.6
* > line_height = font_size * 1.7f */
return (int)roundf(1.7f * (float)font_driver_get_message_width(font, "a", 1, scale) / 0.6f);
}
int font_driver_get_line_ascender(font_data_t *font, float scale)
{
struct font_line_metrics *metrics = NULL;
/* First try the line metrics implementation */
if (font && font->renderer && font->renderer->get_line_metrics)
if ((font->renderer->get_line_metrics(font->renderer_data, &metrics)))
return (int)roundf(metrics->ascender * scale);
/* Else return an approximation
* (uses a fudge of standard font metrics - mostly garbage...)
* > font_size = (width of 'a') / 0.6
* > ascender = 1.58 * font_size * 0.75 */
return (int)roundf(1.58f * 0.75f * (float)font_driver_get_message_width(font, "a", 1, scale) / 0.6f);
}
int font_driver_get_line_descender(font_data_t *font, float scale)
{
struct font_line_metrics *metrics = NULL;
/* First try the line metrics implementation */
if (font && font->renderer && font->renderer->get_line_metrics)
if ((font->renderer->get_line_metrics(font->renderer_data, &metrics)))
return (int)roundf(metrics->descender * scale);
/* Else return an approximation
* (uses a fudge of standard font metrics - mostly garbage...)
* > font_size = (width of 'a') / 0.6
* > descender = 1.58 * font_size * 0.25 */
return (int)roundf(1.58f * 0.25f * (float)font_driver_get_message_width(font, "a", 1, scale) / 0.6f);
}
int font_driver_get_line_centre_offset(font_data_t *font, float scale)
{
struct font_line_metrics *metrics = NULL;
/* First try the line metrics implementation */
if (font && font->renderer && font->renderer->get_line_metrics)
if ((font->renderer->get_line_metrics(font->renderer_data, &metrics)))
return (int)roundf((metrics->ascender - metrics->descender) * 0.5f * scale);
/* Else return an approximation... */
return (int)roundf((1.58f * 0.5f * (float)font_driver_get_message_width(font, "a", 1, scale) / 0.6f) / 2.0f);
}
void font_driver_free(font_data_t *font)
{
if (font)
{
bool is_threaded = false;
#ifdef HAVE_THREADS
bool *is_threaded_tmp = video_driver_get_threaded();
is_threaded = *is_threaded_tmp;
#endif
if (font->renderer && font->renderer->free)
font->renderer->free(font->renderer_data, is_threaded);
font->renderer = NULL;
font->renderer_data = NULL;
free(font);
}
}
font_data_t *font_driver_init_first(
void *video_data, const char *font_path, float font_size,
bool threading_hint, bool is_threaded,
enum font_driver_render_api api)
{
const void *font_driver = NULL;
void *font_handle = NULL;
bool ok = false;
#ifdef HAVE_THREADS
if ( threading_hint
&& is_threaded
&& !video_driver_is_hw_context())
ok = video_thread_font_init(&font_driver, &font_handle,
video_data, font_path, font_size, api, font_init_first,
is_threaded);
else
#endif
ok = font_init_first(&font_driver, &font_handle,
video_data, font_path, font_size, api, is_threaded);
if (ok)
{
font_data_t *font = (font_data_t*)malloc(sizeof(*font));
if (font)
{
font->renderer = (const font_renderer_t*)font_driver;
font->renderer_data = font_handle;
font->size = font_size;
return font;
}
}
return NULL;
}
void font_driver_init_osd(
void *video_data,
const video_info_t *video_info,
bool threading_hint,
bool is_threaded,
enum font_driver_render_api api)
{
if (!video_font_driver && video_info)
video_font_driver = font_driver_init_first(video_data,
*video_info->path_font ? video_info->path_font : NULL,
video_info->font_size, threading_hint, is_threaded, api);
}
void font_driver_free_osd(void)
{
if (video_font_driver)
font_driver_free(video_font_driver);
video_font_driver = NULL;
}
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