Atmosphere/stratosphere/fatal/source/fatal_font.cpp

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/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <ft2build.h>
#include FT_FREETYPE_H
#include "fatal_config.hpp"
#include "fatal_font.hpp"
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/* Define color conversion macros. */
#define RGB888_TO_RGB565(r, g, b) ((((r >> 3) << 11) & 0xF800) | (((g >> 2) << 5) & 0x7E0) | ((b >> 3) & 0x1F))
#define RGB565_GET_R8(c) ((((c >> 11) & 0x1F) << 3) | ((c >> 13) & 7))
#define RGB565_GET_G8(c) ((((c >> 5) & 0x3F) << 2) | ((c >> 9) & 3))
#define RGB565_GET_B8(c) ((((c >> 0) & 0x1F) << 3) | ((c >> 2) & 7))
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namespace sts::fatal::srv::font {
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namespace {
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/* Font state globals. */
u16 *g_frame_buffer = nullptr;
u32 (*g_unswizzle_func)(u32, u32) = nullptr;
u16 g_font_color = 0xFFFF; /* White. */
float g_font_size = 16.0f;
u32 g_line_x = 0, g_cur_x = 0, g_cur_y = 0;
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u32 g_mono_adv = 0;
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PlFontData g_font;
PlFontData g_fonts[PlSharedFontType_Total];
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FT_Library g_library;
FT_Face g_face;
FT_Error g_ft_err = 0;
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/* Helpers. */
u16 Blend(u16 color, u16 bg, u8 alpha) {
const u32 c_r = RGB565_GET_R8(color);
const u32 c_g = RGB565_GET_G8(color);
const u32 c_b = RGB565_GET_B8(color);
const u32 b_r = RGB565_GET_R8(bg);
const u32 b_g = RGB565_GET_G8(bg);
const u32 b_b = RGB565_GET_B8(bg);
const u32 r = ((alpha * c_r) + ((0xFF - alpha) * b_r)) / 0xFF;
const u32 g = ((alpha * c_g) + ((0xFF - alpha) * b_g)) / 0xFF;
const u32 b = ((alpha * c_b) + ((0xFF - alpha) * b_b)) / 0xFF;
return RGB888_TO_RGB565(r, g, b);
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}
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void DrawGlyph(FT_Bitmap *bitmap, u32 x, u32 y) {
u8* imageptr = bitmap->buffer;
if (bitmap->pixel_mode!=FT_PIXEL_MODE_GRAY) return;
for (u32 tmpy = 0; tmpy < bitmap->rows; tmpy++) {
for (u32 tmpx = 0; tmpx < bitmap->width; tmpx++) {
/* Implement very simple blending, as the bitmap value is an alpha value. */
u16 *ptr = &g_frame_buffer[g_unswizzle_func(x + tmpx, y + tmpy)];
*ptr = Blend(g_font_color, *ptr, imageptr[tmpx]);
}
imageptr += bitmap->pitch;
}
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}
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void DrawString(const char *str, bool add_line, bool mono = false) {
FT_UInt glyph_index;
FT_GlyphSlot slot = g_face->glyph;
const size_t len = strlen(str);
u32 cur_x = g_cur_x, cur_y = g_cur_y;
ON_SCOPE_EXIT {
if (add_line) {
/* Advance to next line. */
g_cur_x = g_line_x;
g_cur_y = cur_y + (g_face->size->metrics.height >> 6);
} else {
g_cur_x = cur_x;
g_cur_y = cur_y;
}
};
for (u32 i = 0; i < len; ) {
u32 cur_char;
ssize_t unit_count = decode_utf8(&cur_char, reinterpret_cast<const u8 *>(&str[i]));
if (unit_count <= 0) break;
i += unit_count;
if (cur_char == '\n') {
cur_x = g_line_x;
cur_y += g_face->size->metrics.height >> 6;
continue;
}
glyph_index = FT_Get_Char_Index(g_face, cur_char);
g_ft_err = FT_Load_Glyph(g_face, glyph_index, FT_LOAD_DEFAULT);
if (g_ft_err == 0) {
g_ft_err = FT_Render_Glyph(g_face->glyph, FT_RENDER_MODE_NORMAL);
}
if (g_ft_err) {
return;
}
DrawGlyph(&slot->bitmap, cur_x + slot->bitmap_left + ((mono && g_mono_adv > slot->advance.x) ? ((g_mono_adv - slot->advance.x) >> 7) : 0), cur_y - slot->bitmap_top);
cur_x += (mono ? g_mono_adv : slot->advance.x) >> 6;
cur_y += slot->advance.y >> 6;
}
}
}
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void PrintLine(const char *str) {
return DrawString(str, true);
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}
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void PrintFormatLine(const char *format, ...) {
char char_buf[0x400];
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va_list va_arg;
va_start(va_arg, format);
vsnprintf(char_buf, sizeof(char_buf), format, va_arg);
va_end(va_arg);
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PrintLine(char_buf);
}
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void Print(const char *str) {
return DrawString(str, false);
}
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void PrintFormat(const char *format, ...) {
char char_buf[0x400];
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va_list va_arg;
va_start(va_arg, format);
vsnprintf(char_buf, sizeof(char_buf), format, va_arg);
va_end(va_arg);
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Print(char_buf);
}
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void PrintMonospaceU64(u64 x) {
char char_buf[0x400];
snprintf(char_buf, sizeof(char_buf), "%016lX", x);
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DrawString(char_buf, false, true);
}
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void PrintMonospaceU32(u32 x) {
char char_buf[0x400];
snprintf(char_buf, sizeof(char_buf), "%08X", x);
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DrawString(char_buf, false, true);
}
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void PrintMonospaceBlank(u32 width) {
char char_buf[0x400] = {0};
for (size_t i = 0; i < width && i < sizeof(char_buf); i++) {
char_buf[i] = ' ';
}
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DrawString(char_buf, false, true);
}
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void SetFontColor(u16 color) {
g_font_color = color;
}
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void SetPosition(u32 x, u32 y) {
g_line_x = x;
g_cur_x = x;
g_cur_y = y;
}
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u32 GetX() {
return g_cur_x;
}
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u32 GetY() {
return g_cur_y;
}
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void SetFontSize(float fsz) {
g_font_size = fsz;
g_ft_err = FT_Set_Char_Size(g_face, 0, static_cast<u32>(g_font_size * 64.0f), 96, 96);
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g_ft_err = FT_Load_Glyph(g_face, FT_Get_Char_Index(g_face, 'A'), FT_LOAD_DEFAULT);
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if (g_ft_err == 0) {
g_ft_err = FT_Render_Glyph(g_face->glyph, FT_RENDER_MODE_NORMAL);
}
if (g_ft_err == 0) {
g_mono_adv = g_face->glyph->advance.x;
}
}
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void AddSpacingLines(float num_lines) {
g_cur_x = g_line_x;
g_cur_y += static_cast<u32>((static_cast<float>(g_face->size->metrics.height) * num_lines) / 64.0f);
}
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void ConfigureFontFramebuffer(u16 *fb, u32 (*unswizzle_func)(u32, u32)) {
g_frame_buffer = fb;
g_unswizzle_func = unswizzle_func;
}
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Result InitializeSharedFont() {
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s32 total_fonts = 0;
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R_TRY(plGetSharedFont(GetFatalConfig().GetLanguageCode(), g_fonts, PlSharedFontType_Total, &total_fonts));
R_TRY(plGetSharedFontByType(&g_font, PlSharedFontType_Standard));
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g_ft_err = FT_Init_FreeType(&g_library);
if (g_ft_err) return g_ft_err;
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g_ft_err = FT_New_Memory_Face(g_library, reinterpret_cast<const FT_Byte *>(g_font.address), g_font.size, 0, &g_face);
if (g_ft_err) return g_ft_err;
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SetFontSize(g_font_size);
return g_ft_err;
}
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}