124 lines
3.1 KiB
C++
124 lines
3.1 KiB
C++
#include "StarFont.hpp"
|
|
#include "StarFile.hpp"
|
|
#include "StarFormat.hpp"
|
|
|
|
#include <ft2build.h>
|
|
#include FT_FREETYPE_H
|
|
|
|
namespace Star {
|
|
|
|
struct FTContext {
|
|
FT_Library library;
|
|
|
|
FTContext() {
|
|
library = nullptr;
|
|
if (FT_Init_FreeType(&library))
|
|
throw FontException("Could not initialize freetype library.");
|
|
}
|
|
|
|
~FTContext() {
|
|
if (library) {
|
|
FT_Done_FreeType(library);
|
|
library = nullptr;
|
|
}
|
|
}
|
|
};
|
|
|
|
FTContext ftContext;
|
|
|
|
struct FontImpl {
|
|
FT_Face face;
|
|
};
|
|
|
|
FontPtr Font::loadTrueTypeFont(String const& fileName, unsigned pixelSize) {
|
|
return loadTrueTypeFont(make_shared<ByteArray>(File::readFile(fileName)), pixelSize);
|
|
}
|
|
|
|
FontPtr Font::loadTrueTypeFont(ByteArrayConstPtr const& bytes, unsigned pixelSize) {
|
|
FontPtr font = make_shared<Font>();
|
|
font->m_fontBuffer = bytes;
|
|
|
|
shared_ptr<FontImpl> fontImpl = make_shared<FontImpl>();
|
|
if (FT_New_Memory_Face(
|
|
ftContext.library, (FT_Byte const*)font->m_fontBuffer->ptr(), font->m_fontBuffer->size(), 0, &fontImpl->face))
|
|
throw FontException("Could not load font from buffer");
|
|
|
|
font->m_fontImpl = fontImpl;
|
|
font->setPixelSize(pixelSize);
|
|
|
|
return font;
|
|
}
|
|
|
|
Font::Font() {
|
|
m_pixelSize = 0;
|
|
}
|
|
|
|
FontPtr Font::clone() const {
|
|
return Font::loadTrueTypeFont(m_fontBuffer, m_pixelSize);
|
|
}
|
|
|
|
void Font::setPixelSize(unsigned pixelSize) {
|
|
if (pixelSize == 0) {
|
|
pixelSize = 1;
|
|
}
|
|
|
|
if (m_pixelSize == pixelSize)
|
|
return;
|
|
|
|
if (FT_Set_Pixel_Sizes(m_fontImpl->face, pixelSize, 0))
|
|
throw FontException(strf("Cannot set font pixel size to: %s", pixelSize));
|
|
m_pixelSize = pixelSize;
|
|
}
|
|
|
|
unsigned Font::height() const {
|
|
return m_pixelSize;
|
|
}
|
|
|
|
unsigned Font::width(String::Char c) {
|
|
if (auto width = m_widthCache.maybe({c, m_pixelSize})) {
|
|
return *width;
|
|
} else {
|
|
FT_Load_Char(m_fontImpl->face, c, FT_LOAD_DEFAULT);
|
|
unsigned newWidth = (m_fontImpl->face->glyph->advance.x + 32) / 64;
|
|
m_widthCache.insert({c, m_pixelSize}, newWidth);
|
|
return newWidth;
|
|
}
|
|
}
|
|
|
|
Image Font::render(String::Char c) {
|
|
if (!m_fontImpl)
|
|
throw FontException("Font::render called on uninitialized font.");
|
|
|
|
FT_UInt glyph_index = FT_Get_Char_Index(m_fontImpl->face, c);
|
|
if (FT_Load_Glyph(m_fontImpl->face, glyph_index, FT_LOAD_FORCE_AUTOHINT) != 0)
|
|
return {};
|
|
|
|
/* convert to an anti-aliased bitmap */
|
|
if (FT_Render_Glyph(m_fontImpl->face->glyph, FT_RENDER_MODE_NORMAL) != 0)
|
|
return {};
|
|
|
|
FT_GlyphSlot slot = m_fontImpl->face->glyph;
|
|
|
|
int width = (slot->advance.x + 32) / 64;
|
|
int height = m_pixelSize;
|
|
|
|
Image image(width, height, PixelFormat::RGBA32);
|
|
for (int y = 0; y < height; ++y) {
|
|
for (int x = 0; x < width; ++x) {
|
|
int bx = x;
|
|
int by = y + slot->bitmap_top - m_fontImpl->face->size->metrics.ascender / 64;
|
|
if (bx >= 0 && by >= 0 && bx < (int)slot->bitmap.width && by < (int)slot->bitmap.rows) {
|
|
unsigned char* p = slot->bitmap.buffer + by * slot->bitmap.pitch;
|
|
unsigned char val = *(p + bx);
|
|
image.set(x, height - y - 1, Vec4B(255, 255, 255, val));
|
|
} else {
|
|
image.set(x, height - y - 1, Vec4B(255, 255, 255, 0));
|
|
}
|
|
}
|
|
}
|
|
|
|
return image;
|
|
}
|
|
|
|
}
|