diff options
| -rw-r--r-- | skia/ext/SkFontHost_fontconfig.cpp | 61 |
1 files changed, 37 insertions, 24 deletions
diff --git a/skia/ext/SkFontHost_fontconfig.cpp b/skia/ext/SkFontHost_fontconfig.cpp index 46d8d45..d4726d7 100644 --- a/skia/ext/SkFontHost_fontconfig.cpp +++ b/skia/ext/SkFontHost_fontconfig.cpp @@ -27,8 +27,9 @@ #include <map> #include <string> -#include <unistd.h> +#include <sys/mman.h> #include <sys/stat.h> +#include <unistd.h> #include "SkFontHost.h" #include "SkStream.h" @@ -235,17 +236,28 @@ uint32_t SkFontHost::NextLogicalFont(SkFontID fontID) { class SkFileDescriptorStream : public SkStream { public: - SkFileDescriptorStream(int fd) - : fd_(fd) { + SkFileDescriptorStream(int fd) { + memory_ = NULL; + offset_ = 0; + + struct stat st; + if (fstat(fd, &st)) + return; + + void* memory = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); + if (memory == MAP_FAILED) + return; + + memory_ = reinterpret_cast<uint8_t*>(memory); + length_ = st.st_size; } ~SkFileDescriptorStream() { - close(fd_); + munmap(const_cast<uint8_t*>(memory_), length_); } virtual bool rewind() { - if (lseek(fd_, 0, SEEK_SET) == -1) - return false; + offset_ = 0; return true; } @@ -253,33 +265,34 @@ class SkFileDescriptorStream : public SkStream { virtual size_t read(void* buffer, size_t size) { if (!buffer && !size) { // This is request for the length of the stream. - struct stat st; - if (fstat(fd_, &st) == -1) - return 0; - return st.st_size; + return length_; } if (!buffer) { // This is a request to skip bytes. - const off_t current_position = lseek(fd_, 0, SEEK_CUR); - if (current_position == -1) - return 0; - const off_t new_position = lseek(fd_, size, SEEK_CUR); - if (new_position == -1) - return 0; - if (new_position < current_position) { - lseek(fd_, current_position, SEEK_SET); - return 0; - } - return new_position; + if (offset_ + size < offset_) + return offset_; + offset_ += size; + if (offset_ > length_) + offset_ = length_; + return offset_; } - // This is a request to read bytes. - return ::read(fd_, buffer, size); + size_t remaining = length_ - offset_; + if (size > remaining) + size = remaining; + memcpy(buffer, memory_ + offset_, size); + offset_ += size; + return size; + } + + virtual const void* getMemoryBase() { + return memory_; } private: - const int fd_; + const uint8_t* memory_; + size_t offset_, length_; }; /////////////////////////////////////////////////////////////////////////////// |