FontCustomPlatformDataFreeType.cpp [plain text]
#include "config.h"
#include "FontCustomPlatformData.h"
#include "FontPlatformData.h"
#include "SharedBuffer.h"
#include <cairo-ft.h>
#include <cairo.h>
#include <ft2build.h>
#include FT_MODULE_H
namespace WebCore {
static void releaseCustomFontData(void* data)
{
static_cast<SharedBuffer*>(data)->deref();
}
FontCustomPlatformData::FontCustomPlatformData(FT_Face freeTypeFace, SharedBuffer& buffer)
: m_fontFace(cairo_ft_font_face_create_for_ft_face(freeTypeFace, FT_LOAD_DEFAULT))
{
buffer.ref(); static cairo_user_data_key_t bufferKey;
cairo_font_face_set_user_data(m_fontFace, &bufferKey, &buffer,
static_cast<cairo_destroy_func_t>(releaseCustomFontData));
static cairo_user_data_key_t freeTypeFaceKey;
cairo_font_face_set_user_data(m_fontFace, &freeTypeFaceKey, freeTypeFace,
reinterpret_cast<cairo_destroy_func_t>(reinterpret_cast<GCallback>(FT_Done_Face)));
}
FontCustomPlatformData::~FontCustomPlatformData()
{
cairo_font_face_destroy(m_fontFace);
}
FontPlatformData FontCustomPlatformData::fontPlatformData(const FontDescription& description, bool bold, bool italic)
{
return FontPlatformData(m_fontFace, description, bold, italic);
}
static bool initializeFreeTypeLibrary(FT_Library& library)
{
FT_Memory memory = bitwise_cast<FT_Memory>(ft_smalloc(sizeof(*memory)));
if (!memory)
return false;
memory->user = nullptr;
memory->alloc = [](FT_Memory, long size) -> void* {
return fastMalloc(size);
};
memory->free = [](FT_Memory, void* block) -> void {
fastFree(block);
};
memory->realloc = [](FT_Memory, long, long newSize, void* block) -> void* {
return fastRealloc(block, newSize);
};
if (FT_New_Library(memory, &library)) {
ft_sfree(memory);
return false;
}
FT_Add_Default_Modules(library);
return true;
}
std::unique_ptr<FontCustomPlatformData> createFontCustomPlatformData(SharedBuffer& buffer, const String&)
{
static FT_Library library;
if (!library && !initializeFreeTypeLibrary(library)) {
library = nullptr;
return nullptr;
}
FT_Face freeTypeFace;
if (FT_New_Memory_Face(library, reinterpret_cast<const FT_Byte*>(buffer.data()), buffer.size(), 0, &freeTypeFace))
return nullptr;
return std::make_unique<FontCustomPlatformData>(freeTypeFace, buffer);
}
bool FontCustomPlatformData::supportsFormat(const String& format)
{
return equalLettersIgnoringASCIICase(format, "truetype")
|| equalLettersIgnoringASCIICase(format, "opentype")
#if USE(WOFF2)
|| equalLettersIgnoringASCIICase(format, "woff2")
#endif
|| equalLettersIgnoringASCIICase(format, "woff");
}
}