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olcPGEX_TTF
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sigonasr2 1 year ago
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      olcPGEX_TTF.h

509
olcPGEX_TTF.h
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#ifndef OLC_PGEX_TTF_H
#define OLC_PGEX_TTF_H
#include "olcPixelGameEngine.h"
#ifdef WIN32
#include <ft2build.h>
#pragma comment(lib, "freetype.lib")
#else
#include <freetype2/ft2build.h>
#endif
#include <iostream>
#include <limits>
#include <string>
#include <vector>
#include FT_FREETYPE_H
#include FT_GLYPH_H
namespace olc {
struct FontRect {
olc::vi2d offset;
olc::vi2d size;
};
class Font : public olc::PGEX {
public:
Font() = default;
~Font() {
if (fontFace != nullptr) {
FT_Done_Face(fontFace);
}
}
Font(std::string path, int fontSize) : fontSize(fontSize) {
FT_Error error = FT_New_Face(library, path.c_str(), 0, &fontFace);
if (error) {
const char *errorString = FT_Error_String(error);
if (errorString == nullptr) {
std::cerr
<< "An unknown error occured while loading the font! Error code: "
<< error << "\n";
} else {
std::cerr << errorString << "\n";
}
}
error = FT_Set_Pixel_Sizes(fontFace, 0, fontSize);
if (error) {
const char *errorString = FT_Error_String(error);
if (errorString == nullptr) {
std::cerr
<< "An unknown error occured while loading the font!Error Code: "
<< error << "\n";
} else {
std::cerr << errorString << "\n";
}
}
}
Font(const Font &other) = delete;
Font(Font &&other) {
fontFace = other.fontFace;
fontSize = other.fontSize;
fallbacks = std::move(other.fallbacks);
other.fontFace = nullptr;
other.fallbacks.clear();
}
Font &operator=(const Font &other) = delete;
Font &operator=(Font &&other) {
fontFace = other.fontFace;
fontSize = other.fontSize;
fallbacks = std::move(other.fallbacks);
other.fontFace = nullptr;
other.fallbacks.clear();
return *this;
}
void DrawString(std::u32string string, int x, int y,
olc::Pixel color = olc::BLACK, float angle = 0.0f) {
FT_Matrix rotMat;
rotMat.xx = (FT_Fixed)(std::cos(angle) * 0x10000L);
rotMat.xy = (FT_Fixed)(-std::sin(angle) * 0x10000L);
rotMat.yx = (FT_Fixed)(std::sin(angle) * 0x10000L);
rotMat.yy = (FT_Fixed)(std::cos(angle) * 0x10000L);
FT_Vector pen;
pen.x = x * 64;
pen.y = (pge->ScreenHeight() - y) * 64;
olc::Pixel::Mode prevMode = pge->GetPixelMode();
pge->SetPixelMode(olc::Pixel::ALPHA);
Font *prevToUse = nullptr;
for (size_t i = 0; i < string.size(); i++) {
char32_t chr = string[i];
Font *toUse = this;
FT_UInt chrIndex = GetCharIndex(chr);
if (chrIndex == 0) {
for (auto &font : fallbacks) {
FT_UInt fbChr = font.GetCharIndex(chr);
if (fbChr != 0) {
chrIndex = fbChr;
toUse = &font;
}
}
}
if (prevToUse == toUse) {
FT_Vector kern;
FT_Get_Kerning(fontFace, string[i - 1], chr,
FT_KERNING_DEFAULT, &kern);
pen.x += kern.x;
pen.y += kern.y;
}
FT_Set_Transform(toUse->fontFace, &rotMat, &pen);
FT_Error error = FT_Load_Char(toUse->fontFace, chr,
FT_LOAD_RENDER | FT_LOAD_COLOR);
if (error) {
const char *errorString = FT_Error_String(error);
if (errorString == nullptr) {
std::cerr
<< "An unknown error occured while rendering a glyph! Error code: "
<< error << "\n";
} else {
std::cerr << errorString << "\n";
}
return;
}
FT_Bitmap bmp = toUse->fontFace->glyph->bitmap;
FT_GlyphSlot slot = toUse->fontFace->glyph;
pen.x += toUse->fontFace->glyph->advance.x;
pen.y += toUse->fontFace->glyph->advance.y;
if(chr=='\n'){
int scaled_line_spacing = fontFace->size->metrics.height;
pen.y -=scaled_line_spacing;
pen.x=x*64;
} else {
DrawBitmap(slot->bitmap_left,
pge->ScreenHeight() - slot->bitmap_top, bmp, color);
}
prevToUse = toUse;
}
pge->SetPixelMode(prevMode);
}
void DrawString(std::u32string string, olc::vi2d pos,
olc::Pixel color = olc::BLACK, float angle = 0.0f) {
DrawString(string, pos.x, pos.y, color, angle);
}
FontRect GetStringBounds(std::u32string string, float angle = 0.0f) {
FT_Matrix rotMat;
rotMat.xx = (FT_Fixed)(std::cos(angle) * 0x10000L);
rotMat.xy = (FT_Fixed)(-std::sin(angle) * 0x10000L);
rotMat.yx = (FT_Fixed)(std::sin(angle) * 0x10000L);
rotMat.yy = (FT_Fixed)(std::cos(angle) * 0x10000L);
FT_Vector pen;
pen.x = 0;
pen.y = 0;
olc::FontRect rect;
constexpr int intMax = std::numeric_limits<int>::max();
constexpr int intMin = std::numeric_limits<int>::min();
int minX = 0;
int minY = 0;
int maxX = 0;
int maxY = 0;
Font *prevToUse = nullptr;
for (size_t i = 0; i < string.size(); i++) {
char32_t chr = string[i];
Font *toUse = this;
FT_UInt chrIndex = GetCharIndex(chr);
if (chrIndex == 0) {
for (auto &font : fallbacks) {
FT_UInt fbChr = font.GetCharIndex(chr);
if (fbChr != 0) {
chrIndex = fbChr;
toUse = &font;
}
}
}
if (prevToUse == toUse) {
FT_Vector kern;
FT_Get_Kerning(fontFace, string[i - 1], chr,
FT_KERNING_DEFAULT, &kern);
pen.x += kern.x;
pen.y += kern.y;
}
FT_Set_Transform(toUse->fontFace, &rotMat, &pen);
FT_Error error = FT_Load_Char(toUse->fontFace, chr,
FT_LOAD_BITMAP_METRICS_ONLY);
if (error) {
const char *errorString = FT_Error_String(error);
if (errorString == nullptr) {
std::cerr
<< "An unknown error occured while loading a glyph! Error code: "
<< error << "\n";
} else {
std::cerr << errorString << "\n";
}
return olc::FontRect{{0, 0}, {0, 0}};
}
FT_GlyphSlot slot = toUse->fontFace->glyph;
FT_Glyph glyph;
FT_Get_Glyph(slot, &glyph);
FT_BBox bbox;
FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_GRIDFIT, &bbox);
if (bbox.xMin < minX) {
minX = bbox.xMin;
}
if (bbox.xMax > maxX) {
maxX = bbox.xMax;
}
if (bbox.yMin < minY) {
minY = bbox.yMin;
}
if (bbox.yMax > maxY) {
maxY = bbox.yMax;
}
pen.x += slot->advance.x;
pen.y += slot->advance.y;
if(chr=='\n'){
int scaled_line_spacing = fontFace->size->metrics.height;
pen.y-=scaled_line_spacing;
pen.x=minX;
}
FT_Done_Glyph(glyph);
}
minX /= 64;
minY /= 64;
maxX /= 64;
maxY /= 64;
return olc::FontRect{{minX, -maxY}, {maxX - minX, maxY - minY}};
}
olc::Sprite *RenderStringToSprite(std::u32string string,
olc::Pixel color) {
olc::FontRect rect = GetStringBounds(string);
olc::Sprite *sprite = new olc::Sprite{rect.size.x, rect.size.y};
for (int x = 0; x < rect.size.x; x++) {
for (int y = 0; y < rect.size.y; y++) {
sprite->SetPixel(x, y, olc::BLANK);
}
}
FT_Vector pen;
pen.x = -rect.offset.x;
pen.y = (pge->ScreenHeight() + rect.offset.y) * 64;
olc::Pixel::Mode prevMode = pge->GetPixelMode();
pge->SetPixelMode(olc::Pixel::ALPHA);
olc::Font *prevToUse = nullptr;
for (size_t i = 0; i < string.size(); i++) {
char32_t chr = string[i];
Font *toUse = this;
FT_UInt chrIndex = GetCharIndex(chr);
if (chrIndex == 0) {
for (auto &font : fallbacks) {
FT_UInt fbChr = font.GetCharIndex(chr);
if (fbChr != 0) {
chrIndex = fbChr;
toUse = &font;
}
}
}
if (prevToUse == toUse) {
FT_Vector kern;
FT_Get_Kerning(fontFace, string[i - 1], chr,
FT_KERNING_DEFAULT, &kern);
pen.x += kern.x;
pen.y += kern.y;
}
FT_Set_Transform(toUse->fontFace, nullptr, &pen);
FT_Error error = FT_Load_Char(toUse->fontFace, chr,
FT_LOAD_RENDER | FT_LOAD_COLOR);
if (error) {
const char *errorString = FT_Error_String(error);
if (errorString == nullptr) {
std::cerr
<< "An unknown error occured while rendering a glyph! Error code: "
<< error << "\n";
} else {
std::cerr << errorString << "\n";
}
return nullptr;
}
FT_Bitmap bmp = toUse->fontFace->glyph->bitmap;
FT_GlyphSlot slot = toUse->fontFace->glyph;
pen.x += toUse->fontFace->glyph->advance.x;
pen.y += toUse->fontFace->glyph->advance.y;
if(chr=='\n'){
int scaled_line_spacing = fontFace->size->metrics.height;
pen.y -=scaled_line_spacing;
pen.x=rect.offset.x;
} else {
DrawBitmapTo(slot->bitmap_left,
pge->ScreenHeight() - slot->bitmap_top, bmp, color,
sprite);
}
}
pge->SetPixelMode(prevMode);
return sprite;
}
olc::Decal *RenderStringToDecal(std::u32string string,
olc::Pixel color) {
Sprite *sprite = RenderStringToSprite(string, color);
olc::Decal *decal = new olc::Decal{sprite};
return decal;
}
olc::Renderable RenderStringToRenderable(std::u32string string,
olc::Pixel color) {
Sprite *sprite = RenderStringToSprite(string, color);
olc::Renderable renderable;
renderable.Create(sprite->width, sprite->height);
for (int x = 0; x < sprite->width; x++) {
for (int y = 0; y < sprite->height; y++) {
renderable.Sprite()->SetPixel(x, y, sprite->GetPixel(x, y));
}
}
delete sprite;
renderable.Decal()->Update();
return renderable;
}
void AddFallbackFont(std::string path) {
fallbacks.emplace_back(path, fontSize);
}
static bool init() {
FT_Error error = FT_Init_FreeType(&library);
if (error) {
const char *errorString = FT_Error_String(error);
if (errorString == nullptr) {
std::cerr
<< "An unknown error occured while loading the font library! "
"Error code: "
<< error << "\n";
} else {
std::cerr << errorString << "\n";
}
return false;
}
return true;
}
private:
void DrawBitmap(int x, int y, FT_Bitmap bmp, olc::Pixel color) {
switch (bmp.pixel_mode) {
case FT_PIXEL_MODE_MONO:
for (size_t bx = 0; bx < bmp.width; bx++) {
for (size_t by = 0; by < bmp.rows; by++) {
int byteOffset = bx / 8;
char byte = bmp.buffer[by * bmp.pitch + byteOffset];
bool val = (byte >> (7 - bx % 8)) & 1;
if (val) {
pge->Draw(x + bx, y + by, color);
}
}
}
break;
case FT_PIXEL_MODE_GRAY:
for (size_t bx = 0; bx < bmp.width; bx++) {
for (size_t by = 0; by < bmp.rows; by++) {
uint8_t byte = bmp.buffer[by * bmp.pitch + bx];
if (byte == 0) {
continue;
}
color.a = byte;
pge->Draw(x + bx, y + by, color);
}
}
break;
case FT_PIXEL_MODE_GRAY2: break;
case FT_PIXEL_MODE_GRAY4: break;
case FT_PIXEL_MODE_LCD: break;
case FT_PIXEL_MODE_LCD_V: break;
case FT_PIXEL_MODE_BGRA:
for (size_t bx = 0; bx < bmp.width; bx++) {
for (size_t by = 0; by < bmp.rows; by++) {
olc::Pixel pixel{
bmp.buffer[by * bmp.pitch + bx * 4 + 2],
bmp.buffer[by * bmp.pitch + bx * 4 + 1],
bmp.buffer[by * bmp.pitch + bx * 4 + 0],
bmp.buffer[by * bmp.pitch + bx * 4 + 3],
};
pge->Draw(x + bx, y + by, pixel);
}
}
break;
}
}
void DrawBitmapTo(int x, int y, FT_Bitmap bmp, olc::Pixel color,
olc::Sprite *sprite) {
switch (bmp.pixel_mode) {
case FT_PIXEL_MODE_MONO:
for (size_t bx = 0; bx < bmp.width; bx++) {
for (size_t by = 0; by < bmp.rows; by++) {
int byteOffset = bx / 8;
char byte = bmp.buffer[by * bmp.pitch + byteOffset];
bool val = (byte >> (7 - bx % 8)) & 1;
if (val) {
sprite->SetPixel(x + bx, y + by, color);
}
}
}
break;
case FT_PIXEL_MODE_GRAY:
for (size_t bx = 0; bx < bmp.width; bx++) {
for (size_t by = 0; by < bmp.rows; by++) {
uint8_t byte = bmp.buffer[by * bmp.pitch + bx];
if (byte == 0) {
continue;
}
color.a = byte;
sprite->SetPixel(x + bx, y + by, color);
}
}
break;
case FT_PIXEL_MODE_GRAY2: break;
case FT_PIXEL_MODE_GRAY4: break;
case FT_PIXEL_MODE_LCD: break;
case FT_PIXEL_MODE_LCD_V: break;
case FT_PIXEL_MODE_BGRA:
for (size_t bx = 0; bx < bmp.width; bx++) {
for (size_t by = 0; by < bmp.rows; by++) {
olc::Pixel pixel{
bmp.buffer[by * bmp.pitch + bx * 4 + 2],
bmp.buffer[by * bmp.pitch + bx * 4 + 1],
bmp.buffer[by * bmp.pitch + bx * 4 + 0],
bmp.buffer[by * bmp.pitch + bx * 4 + 3],
};
sprite->SetPixel(x + bx, y + by, pixel);
}
}
break;
}
}
FT_UInt GetCharIndex(char32_t charCode) {
return FT_Get_Char_Index(fontFace, charCode);
}
FT_Face fontFace = nullptr;
std::vector<Font> fallbacks;
int fontSize;
static FT_Library library;
};
} // namespace olc
#ifdef OLC_PGEX_TTF
#undef OLC_PGEX_TTF
FT_Library olc::Font::library;
#endif
#endif
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