image.cpp

   1 #include "image.hpp"
   2
   3 Image::Image(const std::string &path) {
   4         auto provider = CGDataProviderCreateWithFilename(path.c_str());
   5         std::ifstream file(path);
   6         long magic;
   7         file.read((char*)&magic, 8);
   8         file.close();
   9
  10         CGImageRef ref;
  11
  12         if (magic == 0x0a1a0a0d474e5089) // png magic number
  13                 ref = CGImageCreateWithPNGDataProvider(provider, nullptr, false, kCGRenderingIntentDefault);
  14         else
  15                 ref = CGImageCreateWithJPEGDataProvider(provider, nullptr, false, kCGRenderingIntentDefault);
  16
  17         _width = CGImageGetWidth(ref), _height = CGImageGetHeight(ref);
  18
  19         dataRef = CGDataProviderCopyData(CGImageGetDataProvider(ref));
  20         CGImageRelease(ref);
  21
  22 }
  23
  24 unsigned char *Image::data() {
  25         return (unsigned char*) CFDataGetBytePtr(dataRef);
  26 }
  27
  28 GLfloat Image::width() const { return _width; }
  29 GLfloat Image::height() const { return _height; }
  30
  31 Image::~Image() { CFRelease(dataRef); }