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